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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#nullable disable
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms.Design.Behavior;
namespace System.Windows.Forms.Design;
/// <summary>
/// The ParentControlDesigner class builds on the ControlDesigner. It adds the ability
/// to manipulate child components, and provides a selection UI handler for all
/// components it contains.
/// </summary>
public partial class ParentControlDesigner : ControlDesigner, IOleDragClient
{
private Point _mouseDragBase = InvalidPoint; // the base point of the drag
private Rectangle _mouseDragOffset = Rectangle.Empty; // always keeps the current rectangle
private ToolboxItem _mouseDragTool; // the tool that's being dragged, if we're creating a component
private FrameStyle _mouseDragFrame; // the frame style of this mouse drag
private OleDragDropHandler _oleDragDropHandler; // handler for ole drag drop operations
private EscapeHandler _escapeHandler; // active during drags to override escape.
private Control _pendingRemoveControl; // we've gotten an OnComponentRemoving, and are waiting for OnComponentRemove
private IComponentChangeService _changeService;
private DragAssistanceManager _dragManager; // used to apply snaplines when dragging a new tool rect on the designer's surface
private ToolboxSnapDragDropEventArgs _toolboxSnapDragDropEventArgs; // used to store extra info about a beh. svc. dragdrop from the toolbox
private ToolboxItemSnapLineBehavior _toolboxItemSnapLineBehavior; // this is our generic snapline box for dragging comps from the toolbox
private Graphics _graphics; // graphics object of the adornerwindow (via BehaviorService)
// Services that we keep around for the duration of a drag. you should always check
// to see if you need to get this service. We cache it, but demand create it.
private IToolboxService _toolboxService;
private const int MinGridSize = 2;
private const int MaxGridSize = 200;
// designer options...
private Point _adornerWindowToScreenOffset; // quick lookup for offsetting snaplines for new tools
private bool _checkSnapLineSetting = true; // Since layout options is global for the duration of the designer, we should only query it once.
private bool _defaultUseSnapLines;
private bool _gridSnap = true;
private Size _gridSize = Size.Empty;
private bool _drawGrid = true;
private bool _parentCanSetDrawGrid = true; // since we can inherit the grid/snap setting of our parent,
private bool _parentCanSetGridSize = true; // these 3 properties let us know if these values have
private bool _parentCanSetGridSnap = true; // been set explicitly by a user - so to ignore the parent's setting
private bool _getDefaultDrawGrid = true;
private bool _getDefaultGridSize = true;
private bool _getDefaultGridSnap = true;
private StatusCommandUI _statusCommandUI; // UI for setting the StatusBar Information..
private int _suspendChanging;
/// <summary>
/// This is called after the user selects a toolbox item (that has a ParentControlDesigner
/// associated with it) and draws a reversible rectangle on a designer's surface. If
/// this property returns true, it is indicating that the Controls that were lasso'd on the
/// designer's surface will be re-parented to this designer's control.
/// </summary>
protected virtual bool AllowControlLasso => true;
/// <summary>
/// This is called to check whether a generic dragbox should be drawn when dragging a toolbox item
/// over the designer's surface.
/// </summary>
protected virtual bool AllowGenericDragBox => true;
/// <summary>
/// This is called to check whether the z-order of dragged controls should be maintained when dropped on a
/// ParentControlDesigner. By default it will, but e.g. FlowLayoutPanelDesigner wants to do its own z-ordering.
/// If this returns true, then the DropSourceBehavior will attempt to set the index of the controls being
/// dropped to preserve the original order (in the dragSource). If it returns false, the index will not
/// be set.
/// If this is set to false, then the DropSourceBehavior will not treat a drag as a local drag even
/// if the dragSource and the dragTarget are the same. This will allow a ParentControlDesigner to hook
/// OnChildControlAdded to set the right child index, since in this case, the control(s) being dragged
/// will be removed from the dragSource and then added to the dragTarget.
/// </summary>
protected internal virtual bool AllowSetChildIndexOnDrop => true;
/// <summary>
/// This is called when the component is added to the parent container.
/// Theoretically it performs the same function as IsDropOK does, but
/// unfortunately IsDropOK is not robust enough and does not allow for specific error messages.
/// This method is a chance to display the same error as is displayed at runtime.
/// </summary>
protected internal virtual bool CanAddComponent(IComponent component) => true;
/// <summary>
/// This can be called to determine the current grid spacing and mode.
/// It is sensitive to what modifier keys the user currently has down and
/// will either return the current grid snap dimensions, or a 1x1 point
/// indicating no snap.
/// </summary>
private Size CurrentGridSize => GridSize;
/// <summary>
/// Determines the default location for a control added to this designer.
/// it is usually (0,0), but may be modified if the container has special borders, etc.
/// </summary>
protected virtual Point DefaultControlLocation => new(0, 0);
private bool DefaultUseSnapLines
{
get
{
if (_checkSnapLineSetting)
{
_checkSnapLineSetting = false;
_defaultUseSnapLines = DesignerUtils.UseSnapLines(Component.Site);
}
return _defaultUseSnapLines;
}
}
/// <summary>
/// Accessor method for the DrawGrid property. This property determines
/// if the grid should be drawn on a control.
/// </summary>
protected virtual bool DrawGrid
{
get
{
// If snaplines are on, the we never want to draw the grid
if (DefaultUseSnapLines)
{
return false;
}
else if (_getDefaultDrawGrid)
{
_drawGrid = true;
// Before we check our options page, we need to see if our parent
// is a ParentControlDesigner, is so, then we will want to inherit all
// our grid/snap setting from it - instead of our options page
ParentControlDesigner parent = GetParentControlDesignerOfParent();
if (parent is not null)
{
_drawGrid = parent.DrawGrid;
}
else
{
object value = DesignerUtils.GetOptionValue(ServiceProvider, "ShowGrid");
if (value is bool boolValue)
{
_drawGrid = boolValue;
}
}
}
return _drawGrid;
}
set
{
if (value != _drawGrid)
{
if (_parentCanSetDrawGrid)
{
_parentCanSetDrawGrid = false;
}
if (_getDefaultDrawGrid)
{
_getDefaultDrawGrid = false;
}
_drawGrid = value;
// invalidate the control to remove or draw the grid based on the new value
Control control = Control;
control?.Invalidate(true);
// now, notify all child parent control designers that we have changed our setting
// 'cause they might to change along with us, unless the user has explicitly set
// those values...
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
// for (int i = 0; i < children.Length; i++) {
foreach (Control child in Control.Controls)
{
ParentControlDesigner designer = host.GetDesigner(child) as ParentControlDesigner;
designer?.DrawGridOfParentChanged(_drawGrid);
}
}
}
}
}
/// <summary>
/// Determines whether drag rectangles can be drawn on this designer.
/// </summary>
protected override bool EnableDragRect => true;
internal Size ParentGridSize => GridSize;
/// <summary>
/// Gets/Sets the GridSize property for a form or user control.
/// </summary>
protected Size GridSize
{
get
{
if (_getDefaultGridSize)
{
_gridSize = new Size(8, 8);
// Before we check our options page, we need to see if our parent
// is a ParentControlDesigner, is so, then we will want to inherit all
// our grid/snap setting from it - instead of our options page
ParentControlDesigner parent = GetParentControlDesignerOfParent();
if (parent is not null)
{
_gridSize = parent.GridSize;
}
else
{
object value = DesignerUtils.GetOptionValue(ServiceProvider, "GridSize");
if (value is Size size)
{
_gridSize = size;
}
}
}
return _gridSize;
}
set
{
if (_parentCanSetGridSize)
{
_parentCanSetGridSize = false;
}
if (_getDefaultGridSize)
{
_getDefaultGridSize = false;
}
// do some validation checking here, against min & max GridSize
if (value.Width < MinGridSize || value.Height < MinGridSize ||
value.Width > MaxGridSize || value.Height > MaxGridSize)
throw new ArgumentException(string.Format(SR.InvalidArgument,
"GridSize",
value.ToString()));
_gridSize = value;
// invalidate the control
Control control = Control;
control?.Invalidate(true);
// now, notify all child parent control designers that we have changed our setting
// 'cause they might to change along with us, unless the user has explicitly set
// those values...
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
foreach (Control child in Control.Controls)
{
ParentControlDesigner designer = host.GetDesigner(child) as ParentControlDesigner;
designer?.GridSizeOfParentChanged(_gridSize);
}
}
}
}
/// <summary>
/// This property is used by deriving classes to determine if the designer is
/// in a state where it has a valid MouseDragTool.
/// </summary>
[CLSCompliant(false)]
protected ToolboxItem MouseDragTool => _mouseDragTool;
/// <summary>
/// This property is used by deriving classes to determine if it returns the control being designed or some other
/// Container ...
/// while adding a component to it.
/// e.g: When SplitContainer is selected and a component is being added ... the SplitContainer designer would return a
/// SelectedPanel as the ParentControl for all the items being added rather than itself.
/// </summary>
protected virtual Control GetParentForComponent(IComponent component) => Control;
// We need to allocation new ArrayList and pass it to the caller..
// So its ok to Suppress this.
protected void AddPaddingSnapLines(ref ArrayList snapLines)
=> AddPaddingSnapLinesCommon((snapLines ??= new(4)).Adapt<SnapLine>());
internal void AddPaddingSnapLines(ref IList<SnapLine> snapLines)
=> AddPaddingSnapLinesCommon(snapLines ??= new List<SnapLine>(4));
private void AddPaddingSnapLinesCommon(IList<SnapLine> snapLines)
{
// In order to add padding, we need to get the offset from the usable client area of our control
// and the actual origin of our control. In other words: how big is the non-client area here?
// Ex: we want to add padding on a form to the insides of the borders and below the titlebar.
Point offset = GetOffsetToClientArea();
// the display rectangle should be the client area combined with the padding value
Rectangle displayRectangle = Control.DisplayRectangle;
displayRectangle.X += offset.X; // offset for non-client area
displayRectangle.Y += offset.Y; // offset for non-client area
// add the four paddings of our control
// Even if a control does not have padding, we still want to add Padding snaplines.
// This is because we only try to match to matching snaplines. Makes the code a little easier...
snapLines.Add(new SnapLine(SnapLineType.Vertical, displayRectangle.Left, SnapLine.PaddingLeft, SnapLinePriority.Always));
snapLines.Add(new SnapLine(SnapLineType.Vertical, displayRectangle.Right, SnapLine.PaddingRight, SnapLinePriority.Always));
snapLines.Add(new SnapLine(SnapLineType.Horizontal, displayRectangle.Top, SnapLine.PaddingTop, SnapLinePriority.Always));
snapLines.Add(new SnapLine(SnapLineType.Horizontal, displayRectangle.Bottom, SnapLine.PaddingBottom, SnapLinePriority.Always));
}
/// <summary>
/// Returns a list of SnapLine objects representing interesting
/// alignment points for this control. These SnapLines are used
/// to assist in the positioning of the control on a parent's
/// surface.
/// </summary>
public override IList SnapLines
{
get
{
IList<SnapLine> snapLines = SnapLinesInternal;
if (snapLines is null)
{
Debug.Fail("why did base.SnapLines return null?");
snapLines = new List<SnapLine>(4);
}
AddPaddingSnapLines(ref snapLines);
return snapLines.Unwrap();
}
}
private IServiceProvider ServiceProvider => Component is not null ? Component.Site : (IServiceProvider)null;
/// <summary>
/// Determines if we should snap to grid or not.
/// </summary>
private bool SnapToGrid
{
get
{
// If snap lines are on, the we never want to snap to grid
if (DefaultUseSnapLines)
{
return false;
}
else if (_getDefaultGridSnap)
{
_gridSnap = true;
// Before we check our options page, we need to see if our parent
// is a ParentControlDesigner, is so, then we will want to inherit all
// our grid/snap setting from it - instead of our options page
ParentControlDesigner parent = GetParentControlDesignerOfParent();
if (parent is not null)
{
_gridSnap = parent.SnapToGrid;
}
else
{
object optionValue = DesignerUtils.GetOptionValue(ServiceProvider, "SnapToGrid");
if (optionValue is not null and bool)
{
_gridSnap = (bool)optionValue;
}
}
}
return _gridSnap;
}
set
{
if (_gridSnap != value)
{
if (_parentCanSetGridSnap)
{
_parentCanSetGridSnap = false;
}
if (_getDefaultGridSnap)
{
_getDefaultGridSnap = false;
}
_gridSnap = value;
// now, notify all child parent control designers that we have changed our setting
// 'cause they might to change along with us, unless the user has explicitly set
// those values...
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
foreach (Control child in Control.Controls)
{
ParentControlDesigner designer = host.GetDesigner(child) as ParentControlDesigner;
designer?.GridSnapOfParentChanged(_gridSnap);
}
}
}
}
}
internal virtual void AddChildControl(Control newChild)
{
if (newChild.Left == 0 && newChild.Top == 0 && newChild.Width >= Control.Width && newChild.Height >= Control.Height)
{
// bump the control down one grid size just so it's selectable...
Point loc = newChild.Location;
loc.Offset(GridSize.Width, GridSize.Height);
newChild.Location = loc;
}
Control.Controls.Add(newChild);
Control.Controls.SetChildIndex(newChild, 0);
}
internal void AddControl(Control newChild, IDictionary defaultValues)
{
Point location = Point.Empty;
Size size = Size.Empty;
Size offset = new(0, 0);
bool hasLocation = (defaultValues is not null && defaultValues.Contains("Location"));
bool hasSize = (defaultValues is not null && defaultValues.Contains("Size"));
if (hasLocation)
location = (Point)defaultValues["Location"];
if (hasSize)
size = (Size)defaultValues["Size"];
if (defaultValues is not null && defaultValues.Contains("Offset"))
{
offset = (Size)defaultValues["Offset"];
}
// If this component doesn't have a control designer, or if this control
// is top level, then ignore it. We have the reverse logic in OnComponentAdded
// in the document designer so that we will add those guys to the tray.
// Also, if the child-control has already been parented, we assume it's also been located and return immediately.
// Otherwise, proceed with the parenting and locating.
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null && newChild is not null && !Control.Contains(newChild)
&& host.GetDesigner(newChild) as ControlDesigner is not null && !(newChild is Form form && form.TopLevel))
{
Rectangle bounds = default;
// If we were provided with a location, convert it to parent control coordinates.
// Otherwise, get the control's size and put the location in the middle of it
if (hasLocation)
{
location = Control.PointToClient(location);
bounds.X = location.X;
bounds.Y = location.Y;
}
else
{
// is the currently selected control this container?
ISelectionService selSvc = (ISelectionService)GetService(typeof(ISelectionService));
object primarySelection = selSvc.PrimarySelection;
Control selectedControl = null;
if (primarySelection is not null)
{
selectedControl = ((IOleDragClient)this).GetControlForComponent(primarySelection);
}
// If the resulting control that came back isn't sited, it's not part of the
// design surface and should not be used as a marker.
if (selectedControl is not null && selectedControl.Site is null)
{
selectedControl = null;
}
// if the currently selected container is this parent
// control, default to 0,0
if (primarySelection == Component || selectedControl is null)
{
bounds.X = DefaultControlLocation.X;
bounds.Y = DefaultControlLocation.Y;
}
else
{
// otherwise offset from selected control.
bounds.X = selectedControl.Location.X + GridSize.Width;
bounds.Y = selectedControl.Location.Y + GridSize.Height;
}
}
// If we were not given a size, ask the control for its default. We
// also update the location here so the control is in the middle of
// the user's point, rather than at the edge.
if (hasSize)
{
bounds.Width = size.Width;
bounds.Height = size.Height;
}
else
{
bounds.Size = GetDefaultSize(newChild);
}
// If we were given neither, center the control
if (!hasSize && !hasLocation)
{
// get the adjusted location, then inflate
// the rect so we can find a nice spot
// for this control to live.
Rectangle tempBounds = GetAdjustedSnapLocation(Rectangle.Empty, bounds);
// compute the stacking location
tempBounds = GetControlStackLocation(tempBounds);
bounds = tempBounds;
}
else
{
// Finally, convert the bounds to the appropriate grid snaps
bounds = GetAdjustedSnapLocation(Rectangle.Empty, bounds);
}
// Adjust for the offset, if any
bounds.X += offset.Width;
bounds.Y += offset.Height;
// check to see if we have additional information for bounds from
// the behavior service drag drop logic
if (defaultValues is not null && defaultValues.Contains("ToolboxSnapDragDropEventArgs"))
{
ToolboxSnapDragDropEventArgs e = defaultValues["ToolboxSnapDragDropEventArgs"] as ToolboxSnapDragDropEventArgs;
Rectangle snappedBounds = DesignerUtils.GetBoundsFromToolboxSnapDragDropInfo(e, bounds, Control.IsMirrored);
// Make sure the snapped bounds intersects with the bounds of the root control before we go
// adjusting the drag offset. A race condition exists where the user can drag a tbx item so fast
// that the adorner window will never receive the proper drag/mouse move messages and
// never properly adjust the snap drag info. This cause the control to be added @ 0,0 w.r.t.
// the adorner window.
Control rootControl = host.RootComponent as Control;
if (rootControl is not null && snappedBounds.IntersectsWith(rootControl.ClientRectangle))
{
bounds = snappedBounds;
}
}
// Parent the control to the designer and set it to the front.
PropertyDescriptor controlsProp = TypeDescriptor.GetProperties(Control)["Controls"];
_changeService?.OnComponentChanging(Control, controlsProp);
AddChildControl(newChild);
// Now see if the control has size and location properties.
// Update these values if it does.
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(newChild);
if (props is not null)
{
PropertyDescriptor prop = props["Size"];
prop?.SetValue(newChild, new Size(bounds.Width, bounds.Height));
// VSWhidbey# 364133 - ControlDesigner shadows the Location property. If the control is parented
// and the parent is a scrollable control, then it expects the Location to be in display rectangle coordinates.
// At this point bounds are in client rectangle coordinates, so we need to check if we need to adjust the coordinates.
// The reason this worked in Everett was that the AddChildControl was done AFTER this. The AddChildControl was moved
// above a while back. Not sure what will break if AddChildControl is moved down below, so let's just fix up things
// here.
Point pt = new(bounds.X, bounds.Y);
ScrollableControl p = newChild.Parent as ScrollableControl;
if (p is not null)
{
Point ptScroll = p.AutoScrollPosition;
pt.Offset(-ptScroll.X, -ptScroll.Y); // always want to add the control below/right of the AutoScrollPosition
}
prop = props["Location"];
prop?.SetValue(newChild, pt);
}
_changeService?.OnComponentChanged(Control, controlsProp, Control.Controls, Control.Controls);
newChild.Update();
}
}
/// <summary>
/// Adds all the child components of a component
/// to the given container
/// </summary>
private void AddChildComponents(IComponent component, IContainer container, IDesignerHost host)
{
Control control = GetControl(component);
if (control is null)
{
return;
}
Control parent = control;
Control[] children = new Control[parent.Controls.Count];
parent.Controls.CopyTo(children, 0);
string name;
ISite childSite;
for (int i = 0; i < children.Length; i++)
{
childSite = ((IComponent)children[i]).Site;
IContainer childContainer;
if (childSite is not null)
{
name = childSite.Name;
if (container.Components[name] is not null)
{
name = null;
}
childContainer = childSite.Container;
}
else
{
// name = null;
// we don't want to add unsited child controls because
// these may be items from a composite control. if they
// are legitimate children, the ComponentModelPersister would have
// sited them already.
continue;
}
childContainer?.Remove(children[i]);
if (name is not null)
{
container.Add(children[i], name);
}
else
{
container.Add(children[i]);
}
if (children[i].Parent != parent)
{
parent.Controls.Add(children[i]);
}
else
{
int childIndex = parent.Controls.GetChildIndex(children[i]);
parent.Controls.Remove(children[i]);
parent.Controls.Add(children[i]);
parent.Controls.SetChildIndex(children[i], childIndex);
}
IComponentInitializer init = host.GetDesigner(component) as IComponentInitializer;
init?.InitializeExistingComponent(null);
AddChildComponents(children[i], container, host);
}
}
/// <summary>
/// Disposes this component.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
// If we are not in a mouse drag, then pretend we are cancelling.
// This is such that the base will not set the primary selection to be
// the associated Component. Doing so can cause a crash in hosted designers.
// It doesn't make sense to do so anyway, since the designer (and thus
// the component) is being disposed.
OnMouseDragEnd(_mouseDragBase == InvalidPoint);
EnableDragDrop(false);
if (HasComponent && Control is ScrollableControl control)
{
control.Scroll -= OnScroll;
}
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
_changeService.ComponentRemoving -= OnComponentRemoving;
_changeService.ComponentRemoved -= OnComponentRemoved;
_changeService = null;
}
}
base.Dispose(disposing);
}
/// <summary>
/// This is called by the parent when the ParentControlDesigner's
/// grid/snap settings have changed. Unless the user has explicitly
/// set these values, this designer will just inherit the new ones
/// from the parent.
/// </summary>
private void DrawGridOfParentChanged(bool drawGrid)
{
if (!_parentCanSetDrawGrid)
{
return;
}
// If the parent sets us, then treat this as if no one set us
bool getDefaultDrawGridTemp = _getDefaultDrawGrid;
DrawGrid = drawGrid;
_parentCanSetDrawGrid = true;
_getDefaultDrawGrid = getDefaultDrawGridTemp;
}
/// <summary>
/// This is called by the parent when the ParentControlDesigner's
/// grid/snap settings have changed. Unless the user has explicitly
/// set these values, this designer will just inherit the new ones
/// from the parent.
/// </summary>
private void GridSizeOfParentChanged(Size gridSize)
{
if (_parentCanSetGridSize)
{
// If the parent sets us, then treat this as if no one set us
bool getDefaultGridSizeTemp = _getDefaultGridSize;
GridSize = gridSize;
_parentCanSetGridSize = true;
_getDefaultGridSize = getDefaultGridSizeTemp;
}
}
/// <summary>
/// This is called by the parent when the ParentControlDesigner's
/// grid/snap settings have changed. Unless the user has explicitly
/// set these values, this designer will just inherit the new ones
/// from the parent.
/// </summary>
private void GridSnapOfParentChanged(bool gridSnap)
{
if (_parentCanSetGridSnap)
{
// If the parent sets us, then treat this as if no one set us
bool getDefaultGridSnapTemp = _getDefaultGridSnap;
SnapToGrid = gridSnap;
_parentCanSetGridSnap = true;
_getDefaultGridSnap = getDefaultGridSnapTemp;
}
}
/// <summary>
/// <para>[To be supplied.]</para>
/// </summary>
protected static void InvokeCreateTool(ParentControlDesigner toInvoke, ToolboxItem tool)
{
toInvoke.CreateTool(tool);
}
/// <summary>
/// Determines if the this designer can parent to the specified designer --
/// generally this means if the control for this designer can parent the
/// given ControlDesigner's control.
/// </summary>
public virtual bool CanParent(ControlDesigner controlDesigner)
{
return CanParent(controlDesigner.Control);
}
/// <summary>
/// Determines if the this designer can parent to the specified designer --
/// generally this means if the control for this designer can parent the
/// given ControlDesigner's control.
/// </summary>
public virtual bool CanParent(Control control)
{
return !control.Contains(Control);
}
/// <summary>
/// Creates the given tool in the center of the currently selected
/// control. The default size for the tool is used.
/// </summary>
protected void CreateTool(ToolboxItem tool)
{
CreateToolCore(tool, 0, 0, 0, 0, false, false);
}
/// <summary>
/// Creates the given tool in the currently selected control at the
/// given position. The default size for the tool is used.
/// </summary>
[CLSCompliant(false)]
protected void CreateTool(ToolboxItem tool, Point location)
{
CreateToolCore(tool, location.X, location.Y, 0, 0, true, false);
}
/// <summary>
/// Creates the given tool in the currently selected control. The
/// tool is created with the provided shape.
/// </summary>
[CLSCompliant(false)]
protected void CreateTool(ToolboxItem tool, Rectangle bounds)
{
CreateToolCore(tool, bounds.X, bounds.Y, bounds.Width, bounds.Height, true, true);
}
/// <summary>
/// This is the worker method of all CreateTool methods. It is the only one
/// that can be overridden.
/// </summary>
[CLSCompliant(false)]
protected virtual IComponent[] CreateToolCore(ToolboxItem tool, int x, int y, int width, int height, bool hasLocation, bool hasSize)
{
IComponent[] comp = null;
try
{
// We invoke the drag drop handler for this. This implementation is shared between all designers that
// create components.
comp = GetOleDragHandler().CreateTool(tool, Control, x, y, width, height, hasLocation, hasSize, _toolboxSnapDragDropEventArgs);
}
finally
{
// clear the toolboxSnap drag args so we won't provide bad information the next time around
_toolboxSnapDragDropEventArgs = null;
}
return comp;
}
/// <summary>
/// Used when dragging a new tool rect on the designer's surface -
/// this will return some generic snaplines Allowing the rect to
/// snap to existing control edges on the surface.
/// </summary>
private static SnapLine[] GenerateNewToolSnapLines(Rectangle r)
{
return
[
new SnapLine(SnapLineType.Left, r.Right),
new SnapLine(SnapLineType.Right, r.Right),
new SnapLine(SnapLineType.Bottom, r.Bottom),
new SnapLine(SnapLineType.Top, r.Bottom)
];
}
/// <summary>
/// Finds the array of components within the given rectangle. This uses the rectangle to
/// find controls within our control, and then uses those controls to find the actual
/// components. It returns an object list so the output can be directly fed into
/// the selection service.
/// </summary>
internal List<Control> GetComponentsInRect(Rectangle value, bool screenCoords, bool containRect)
{
List<Control> list = [];
Rectangle rect = screenCoords ? Control.RectangleToClient(value) : value;
IContainer container = Component.Site.Container;
Control control = Control;
int controlCount = control.Controls.Count;
for (int i = 0; i < controlCount; i++)
{
Control child = control.Controls[i];
Rectangle bounds = child.Bounds;
container = DesignerUtils.CheckForNestedContainer(container); // ...necessary to support SplitterPanel components
if (child.Visible && ((containRect && rect.Contains(bounds)) || (!containRect && bounds.IntersectsWith(rect))) &&
child.Site is not null && child.Site.Container == container)
{
list.Add(child);
}
}
return list;
}
/// <summary>
/// Returns the control that represents the UI for the given component.
/// </summary>
protected Control GetControl(object component)
{
IComponent comp = component as IComponent;
if (comp is not null)
{
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
ControlDesigner cd = host.GetDesigner(comp) as ControlDesigner;
if (cd is not null)
{
return cd.Control;
}
}
}
return null;
}
/// <summary>
/// Computes the next default location for a control. It tries to find a spot
/// where no other controls are being obscured and the new control has 2 corners
/// that don't have other controls under them.
/// </summary>
private Rectangle GetControlStackLocation(Rectangle centeredLocation)
{
Control parent = Control;
int parentHeight = parent.ClientSize.Height;
int parentWidth = parent.ClientSize.Width;
if (centeredLocation.Bottom >= parentHeight ||
centeredLocation.Right >= parentWidth)
{
centeredLocation.X = DefaultControlLocation.X;
centeredLocation.Y = DefaultControlLocation.Y;
}
return centeredLocation;
}
/// <summary>
/// Retrieves the default dimensions for the given component class.
/// </summary>
private static Size GetDefaultSize(IComponent component)
{
// Check to see if the control is AutoSized. VSWhidbey #416721
PropertyDescriptor prop = TypeDescriptor.GetProperties(component)["AutoSize"];
Size size;
if (prop is not null &&
!(prop.Attributes.Contains(DesignerSerializationVisibilityAttribute.Hidden) ||
prop.Attributes.Contains(BrowsableAttribute.No)))
{
bool autoSize = (bool)prop.GetValue(component);
if (autoSize)
{
prop = TypeDescriptor.GetProperties(component)["PreferredSize"];
if (prop is not null)
{
size = (Size)prop.GetValue(component);
if (size != Size.Empty)
{
return size;
}
}
}
}
// attempt to get the size property of our component
prop = TypeDescriptor.GetProperties(component)["Size"];
if (prop is not null)
{
// first, let's see if we can get a valid size...
size = (Size)prop.GetValue(component);
// ...if not, we'll see if there's a default size attribute...
if (size.Width <= 0 || size.Height <= 0)
{
var sizeAttr = (DefaultValueAttribute)prop.Attributes[typeof(DefaultValueAttribute)];
if (sizeAttr is not null)
{
return ((Size)sizeAttr.Value);
}
}
else
{
return size;
}
}
// Couldn't get the size or a def size attrib, returning 75,23...
return (new Size(75, 23));
}
/// <summary>
/// Returns a 'BodyGlyph' representing the bounds of this control.
/// The BodyGlyph is responsible for hit testing the related CtrlDes
/// and forwarding messages directly to the designer.
/// </summary>
protected override ControlBodyGlyph GetControlGlyph(GlyphSelectionType selectionType)
{
OnSetCursor();
Rectangle controlRect = BehaviorService.ControlRectInAdornerWindow(Control);
Control parent = Control.Parent;
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (parent is not null && host is not null && host.RootComponent != Component)
{
Rectangle parentRect = BehaviorService.ControlRectInAdornerWindow(parent);
Rectangle nonClipRect = Rectangle.Intersect(parentRect, controlRect);
// If we are not selected...
if (selectionType == GlyphSelectionType.NotSelected)
{
// If we are partially clipped (not fully clipped or wholly contained) by
// our parent,then adjust the bounds of the glyph to be the "visible" rect. VSWhidbey 530929
if (!nonClipRect.IsEmpty && !parentRect.Contains(controlRect))
{
return new ControlBodyGlyph(nonClipRect, Cursor.Current, Control, this);
}
// If we are completely clipped, then we do not want to be a drop target at all
else if (nonClipRect.IsEmpty)
{
return null;
}
}
}
return new ControlBodyGlyph(controlRect, Cursor.Current, Control, this);
}
/// <summary>
/// Adds our ContainerSelectorGlyph to the selection glyphs.
/// </summary>
public override GlyphCollection GetGlyphs(GlyphSelectionType selectionType)
{
GlyphCollection glyphs = base.GetGlyphs(selectionType);
// only add this glyph if our container is 1) moveable 2) not read-only
// AND 3) it is selected .
if ((SelectionRules & SelectionRules.Moveable) != 0 &&
InheritanceAttribute != InheritanceAttribute.InheritedReadOnly && selectionType != GlyphSelectionType.NotSelected)
{
// get the adornerwindow-relative coords for the container control
Point loc = BehaviorService.ControlToAdornerWindow((Control)Component);
Rectangle translatedBounds = new(loc, ((Control)Component).Size);
int glyphOffset = (int)(DesignerUtils.s_containerGrabHandleSize * .5);
// if the control is too small for our ideal position...
if (translatedBounds.Width < 2 * DesignerUtils.s_containerGrabHandleSize)
{
glyphOffset = -1 * glyphOffset;
}
ContainerSelectorBehavior behavior = new((Control)Component, Component.Site, true);
ContainerSelectorGlyph containerSelectorGlyph = new(translatedBounds, DesignerUtils.s_containerGrabHandleSize, glyphOffset, behavior);
glyphs.Insert(0, containerSelectorGlyph);
}
return glyphs;
}
internal OleDragDropHandler GetOleDragHandler()
{
_oleDragDropHandler ??= new OleDragDropHandler(null, (IServiceProvider)GetService(typeof(IDesignerHost)), this);
return _oleDragDropHandler;
}
/// <summary>
/// This method return the ParentControlDesigner of the parenting control,
/// it is used for inheriting the grid size, snap to grid, and draw grid
/// of parenting controls.
/// </summary>
private ParentControlDesigner GetParentControlDesignerOfParent()
{
Control parent = Control.Parent;
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (parent is not null && host is not null)
{
return (host.GetDesigner(parent) as ParentControlDesigner);
}
return null;
}
/// <summary>
/// Updates the location of the control according to the GridSnap and Size.
/// This method simply calls GetUpdatedRect(), then ignores the width and
/// height
/// </summary>
private Rectangle GetAdjustedSnapLocation(Rectangle originalRect, Rectangle dragRect)
{
Rectangle adjustedRect = GetUpdatedRect(originalRect, dragRect, true);
// now, preserve the width and height that was originally passed in
adjustedRect.Width = dragRect.Width;
adjustedRect.Height = dragRect.Height;
// we need to keep in mind that if we adjust to the snap, that we could
// have possibly moved the control's position outside of the display rect.
// ex: groupbox's display rect.x = 3, but we might snap to 0.
// so we need to check with the control's designer to make sure this
// doesn't happen
Point minimumLocation = DefaultControlLocation;
if (adjustedRect.X < minimumLocation.X)
{
adjustedRect.X = minimumLocation.X;
}
if (adjustedRect.Y < minimumLocation.Y)
{
adjustedRect.Y = minimumLocation.Y;
}
// here's our rect that has been snapped to grid
return adjustedRect;
}
internal Point GetSnappedPoint(Point pt)
{
Rectangle r = GetUpdatedRect(Rectangle.Empty, new Rectangle(pt.X, pt.Y, 0, 0), false);
return new Point(r.X, r.Y);
}
internal Rectangle GetSnappedRect(Rectangle originalRect, Rectangle dragRect, bool updateSize)
{
return GetUpdatedRect(originalRect, dragRect, updateSize);
}
/// <summary>
/// Updates the given rectangle, adjusting it for grid snaps as
/// needed.
/// </summary>
protected Rectangle GetUpdatedRect(Rectangle originalRect, Rectangle dragRect, bool updateSize)
{
Rectangle updatedRect;
if (SnapToGrid)
{
Size gridSize = GridSize;
Point halfGrid = new(gridSize.Width / 2, gridSize.Height / 2);
updatedRect = dragRect;
updatedRect.X = originalRect.X;
updatedRect.Y = originalRect.Y;
// decide to snap the start location to grid ...
if (dragRect.X != originalRect.X)
{
updatedRect.X = (dragRect.X / gridSize.Width) * gridSize.Width;
// Snap the location to the grid point closest to the dragRect location
if (dragRect.X - updatedRect.X > halfGrid.X)
{
updatedRect.X += gridSize.Width;
}
}
if (dragRect.Y != originalRect.Y)
{
updatedRect.Y = (dragRect.Y / gridSize.Height) * gridSize.Height;
// Snap the location to the grid point closest to the dragRect location
if (dragRect.Y - updatedRect.Y > halfGrid.Y)
{
updatedRect.Y += gridSize.Height;
}
}
// here, we need to calculate the new size depending on how we snap to the grid ...
if (updateSize)
{
// update the width and the height
updatedRect.Width = ((dragRect.X + dragRect.Width) / gridSize.Width) * gridSize.Width - updatedRect.X;
updatedRect.Height = ((dragRect.Y + dragRect.Height) / gridSize.Height) * gridSize.Height - updatedRect.Y;
// ASURT 71552 <subhag> Added so that if the updated dimension is smaller than grid dimension then snap that dimension to
// the grid dimension
if (updatedRect.Width < gridSize.Width)
updatedRect.Width = gridSize.Width;
if (updatedRect.Height < gridSize.Height)
updatedRect.Height = gridSize.Height;
}
}
else
{
updatedRect = dragRect;
}
return updatedRect;
}
/// <summary>
/// Initializes the designer with the given component. The designer can
/// get the component's site and request services from it in this call.
/// </summary>
public override void Initialize(IComponent component)
{
base.Initialize(component);
if (Control is ScrollableControl control)
{
control.Scroll += OnScroll;
}
EnableDragDrop(true);
// Hook load events. At the end of load, we need to do a scan through all
// of our child controls to see which ones are being inherited. We
// connect these up.
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
_changeService = (IComponentChangeService)host.GetService(typeof(IComponentChangeService));
if (_changeService is not null)
{
_changeService.ComponentRemoving += OnComponentRemoving;
_changeService.ComponentRemoved += OnComponentRemoved;
}
}
// update the Status Command
_statusCommandUI = new StatusCommandUI(component.Site);
}
/// <summary>
/// </summary>
public override void InitializeNewComponent(IDictionary defaultValues)
{
base.InitializeNewComponent(defaultValues);
if (!AllowControlLasso)
{
return;
}
if (defaultValues is not null && defaultValues["Size"] is not null && defaultValues["Location"] is not null && defaultValues["Parent"] is not null)
{
// build our rect that may have covered some child controls
Rectangle bounds = new((Point)defaultValues["Location"], (Size)defaultValues["Size"]);
// ask the parent to give us the comps within this rect
if (defaultValues["Parent"] is not IComponent parent)
{
Debug.Fail("Couldn't get the parent instance from 'defaultValues'");
return;
}
if (GetService(typeof(IDesignerHost)) is not IDesignerHost host)
{
Debug.Fail("Failed to IDesignerHost");
return;
}
if (host.GetDesigner(parent) is not ParentControlDesigner parentDesigner)
{
Debug.Fail($"Could not get ParentControlDesigner for {parent}");
return;
}
List<Control> selectedControls = parentDesigner.GetComponentsInRect(bounds, true, true /* component should be fully contained*/);
if (selectedControls is null || selectedControls.Count == 0)
{
// no comps to re-parent
return;
}
// remove this
if (selectedControls.Contains(Control))
{
selectedControls.Remove(Control);
}
// Finally, we have identified that we need to re-parent the lasso'd controls.
// We will start a designer transaction, send some changing notifications
// and swap parents...
ReParentControls(Control, selectedControls, string.Format(SR.ParentControlDesignerLassoShortcutRedo, Control.Site.Name), host);
}
}
/// <summary>
/// Checks if an option has the default value
/// </summary>
private bool IsOptionDefault(string optionName, object value)
{
IDesignerOptionService optSvc = (IDesignerOptionService)GetService(typeof(IDesignerOptionService));
object defaultValue = null;
if (optSvc is null)
{
if (optionName.Equals("ShowGrid"))
{
defaultValue = true;
}
else if (optionName.Equals("SnapToGrid"))
{
defaultValue = true;
}
else if (optionName.Equals("GridSize"))
{
defaultValue = new Size(8, 8);
}
}
else
{
defaultValue = DesignerUtils.GetOptionValue(ServiceProvider, optionName);
}
if (defaultValue is not null)
{
return defaultValue.Equals(value);
}
else
{
return value is null;
}
}
/// <summary>
/// </summary>
private void OnComponentRemoving(object sender, ComponentEventArgs e)
{
Control comp = e.Component as Control;
if (comp is not null && comp.Parent is not null && comp.Parent == Control)
{
_pendingRemoveControl = comp;
// We suspend Component Changing Events for bulk operations to avoid unnecessary serialization\deserialization for undo
// see bug 488115
if (_suspendChanging == 0)
{
_changeService.OnComponentChanging(Control, TypeDescriptor.GetProperties(Control)["Controls"]);
}
}
}
/// <summary>
/// </summary>
private void OnComponentRemoved(object sender, ComponentEventArgs e)
{
if (e.Component == _pendingRemoveControl)
{
_pendingRemoveControl = null;
_changeService.OnComponentChanged(Control, TypeDescriptor.GetProperties(Control)["Controls"]);
}
}
internal void SuspendChangingEvents()
{
_suspendChanging++;
Debug.Assert(_suspendChanging > 0, "Unbalanced SuspendChangingEvents\\ResumeChangingEvents");
}
internal void ResumeChangingEvents()
{
_suspendChanging--;
Debug.Assert(_suspendChanging >= 0, "Unbalanced SuspendChangingEvents\\ResumeChangingEvents");
}
internal void ForceComponentChanging()
{
_changeService.OnComponentChanging(Control, TypeDescriptor.GetProperties(Control)["Controls"]);
}
/// <summary>
/// Called in order to cleanup a drag and drop operation. Here we
/// cleanup any operations that were performed at the beginning of a drag.
/// </summary>
protected override void OnDragComplete(DragEventArgs de)
{
DropSourceBehavior.BehaviorDataObject data = de.Data as DropSourceBehavior.BehaviorDataObject;
data?.CleanupDrag();
}
/// <summary>
/// Called in response to a drag drop for OLE drag and drop. Here we
/// drop a toolbox component on our parent control.
/// </summary>
// Standard 'catch all - rethrow critical' exception pattern
protected override void OnDragDrop(DragEventArgs de)
{
// if needed, cache extra info about the behavior dragdrop event
// ex: snapline and offset info
if (de is ToolboxSnapDragDropEventArgs)
{
_toolboxSnapDragDropEventArgs = de as ToolboxSnapDragDropEventArgs;
}
DropSourceBehavior.BehaviorDataObject data = de.Data as DropSourceBehavior.BehaviorDataObject;
if (data is not null)
{
data.Target = Component;
data.EndDragDrop(AllowSetChildIndexOnDrop);
OnDragComplete(de);
}
// this should only occur when D&Ding between component trays on two separate forms.
else if (_mouseDragTool is null && data is null)
{
OleDragDropHandler ddh = GetOleDragHandler();
if (ddh is not null)
{
IOleDragClient target = ddh.Destination;
if (target is not null && target.Component is not null && target.Component.Site is not null)
{
IContainer container = target.Component.Site.Container;
if (container is not null)
{
object[] dragComps = OleDragDropHandler.GetDraggingObjects(de);
for (int i = 0; i < dragComps.Length; i++)
{
IComponent comp = dragComps[i] as IComponent;
container.Add(comp);
}
}
}
}
}
if (_mouseDragTool is not null)
{
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
host?.Activate();
try
{
// There may be a wizard displaying as a result of CreateTool.
// we do not want the behavior service thinking there he is dragging while this wizard is up
// it causes the cursor to constantly flicker to the toolbox cursor.
// this will cause the BehSvc to return from 'drag mode'
BehaviorService?.EndDragNotification();
CreateTool(_mouseDragTool, new Point(de.X, de.Y));
}
catch (Exception e) when (!e.IsCriticalException())
{
DisplayError(e);
}
_mouseDragTool = null;
return;
}
}
/// <summary>
/// Called in response to a drag enter for OLE drag and drop.
/// </summary>
protected override void OnDragEnter(DragEventArgs de)
{
// Are we are new target, meaning is the drop target different than the drag source
bool newTarget = false;
DropSourceBehavior.BehaviorDataObject behDataObject = null;
DropSourceBehavior.BehaviorDataObject data = de.Data as DropSourceBehavior.BehaviorDataObject;
if (data is not null)
{
behDataObject = data;
behDataObject.Target = Component;
de.Effect = (Control.ModifierKeys == Keys.Control) ? DragDropEffects.Copy : DragDropEffects.Move;
newTarget = !(data.Source.Equals(Component)); // Check if we are moving to a new target
}
// If tab order UI is being shown, then don't allow anything to be
// dropped here.
IMenuCommandService ms = (IMenuCommandService)GetService(typeof(IMenuCommandService));
if (ms is not null)
{
MenuCommand tabCommand = ms.FindCommand(StandardCommands.TabOrder);
if (tabCommand is not null && tabCommand.Checked)
{
de.Effect = DragDropEffects.None;
return;
}
}
// Get the objects that are being dragged
object[] dragComps;
if (behDataObject is not null && behDataObject.DragComponents is not null)
{
dragComps = behDataObject.DragComponents.ToArray();
}
else
{
// Keep GetOleDragHandler() for compat.
_ = GetOleDragHandler();
dragComps = OleDragDropHandler.GetDraggingObjects(de);
}
Control draggedControl = null;
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
DocumentDesigner parentDesigner = host.GetDesigner(host.RootComponent) as DocumentDesigner;
if (parentDesigner is not null)
{
if (!parentDesigner.CanDropComponents(de))
{
de.Effect = DragDropEffects.None;
return;
}
}
}
if (dragComps is not null)
{
if (data is null)
{
// This should only be true, when moving a component from the Tray,
// to a new form. In this case, we are moving targets.
newTarget = true;
}
for (int i = 0; i < dragComps.Length; i++)
{
if (host is null || dragComps[i] is not IComponent comp)
{
continue;
}
if (newTarget)
{
// If we are dropping on a new target, then check to see if any of the components
// are inherited. If so, don't allow them to be moved.
InheritanceAttribute attr = (InheritanceAttribute)TypeDescriptor.GetAttributes(comp)[typeof(InheritanceAttribute)];
if (attr is not null && !attr.Equals(InheritanceAttribute.NotInherited) && !attr.Equals(InheritanceAttribute.InheritedReadOnly))
{
de.Effect = DragDropEffects.None;
return;
}
}
// try go get the control for the thing that's being dragged
object draggedDesigner = host.GetDesigner(comp);
if (draggedDesigner is IOleDragClient)
{
draggedControl = ((IOleDragClient)this).GetControlForComponent(dragComps[i]);
}
Control ctrl = dragComps[i] as Control;
if (draggedControl is null && ctrl is not null)
{
draggedControl = ctrl;
}
// oh well, it's not a control so it doesn't matter
if (draggedControl is null)
{
continue;
}
// If we're inheriting from a private container, we can't modify the controls collection.
// So drag-drop is only allowed within the container i.e. the dragged controls must already
// be parented to this container.
if (InheritanceAttribute == InheritanceAttribute.InheritedReadOnly && draggedControl.Parent != Control)
{
de.Effect = DragDropEffects.None;
return;
}
// Can the component be dropped on this parent? I.e. you can only
// drop a tab page on a tab control, not say a panel
if (!((IOleDragClient)this).IsDropOk(comp))
{
de.Effect = DragDropEffects.None;
return;
}
}
// should only occur when dragging and dropping
// from the component tray.
if (data is null)
{
PerformDragEnter(de, host);
}
}
_toolboxService ??= (IToolboxService)GetService(typeof(IToolboxService));
// Only assume the items came from the ToolBox if dragComps == null
if (_toolboxService is not null && dragComps is null)
{
_mouseDragTool = _toolboxService.DeserializeToolboxItem(de.Data, host);
// If we have a valid toolbox item to drag and
// we haven't pushed our behavior, then do so now...
if ((_mouseDragTool is not null) && BehaviorService is not null && BehaviorService.UseSnapLines)
{
// demand create
_toolboxItemSnapLineBehavior ??= new ToolboxItemSnapLineBehavior(Component.Site, BehaviorService, this, AllowGenericDragBox);
if (!_toolboxItemSnapLineBehavior.IsPushed)
{
BehaviorService.PushBehavior(_toolboxItemSnapLineBehavior);
_toolboxItemSnapLineBehavior.IsPushed = true;
}
}
if (_mouseDragTool is not null)
{
PerformDragEnter(de, host);
}
// This must be called last. Tell the behavior that we are beginning a drag.
// Yeah, this is OnDragEnter, but to the behavior this is as if we are starting a drag.
// VSWhidbey 487816
_toolboxItemSnapLineBehavior?.OnBeginDrag();
}
}
private void PerformDragEnter(DragEventArgs de, IDesignerHost host)
{
host?.Activate();
Debug.Assert((de.AllowedEffect & (DragDropEffects.Move | DragDropEffects.Copy)) != 0, "DragDropEffect.Move | .Copy isn't allowed?");
if ((de.AllowedEffect & DragDropEffects.Move) != 0)
{
de.Effect = DragDropEffects.Move;
}
else
{
de.Effect = DragDropEffects.Copy;
}
// If we're inheriting from a private container, we can't modify the controls collection.
if (InheritanceAttribute == InheritanceAttribute.InheritedReadOnly)
{
de.Effect = DragDropEffects.None;
return;
}
// Also, select this parent control to indicate it will be the drop target.
ISelectionService sel = (ISelectionService)GetService(typeof(ISelectionService));
sel?.SetSelectedComponents(new object[] { Component }, SelectionTypes.Replace);
}
/// <summary>
/// Called when a drag-drop operation leaves the control designer view
/// </summary>
protected override void OnDragLeave(EventArgs e)
{
// if we're dragging around our generic snapline box - let's remove it here
if (_toolboxItemSnapLineBehavior is not null && _toolboxItemSnapLineBehavior.IsPushed)
{
BehaviorService.PopBehavior(_toolboxItemSnapLineBehavior);
_toolboxItemSnapLineBehavior.IsPushed = false;
}
_mouseDragTool = null;
}
/// <summary>
/// Called when a drag drop object is dragged over the control designer view
/// </summary>
protected override void OnDragOver(DragEventArgs de)
{
if (de.Data is DropSourceBehavior.BehaviorDataObject data)
{
data.Target = Component;
de.Effect = (Control.ModifierKeys == Keys.Control) ? DragDropEffects.Copy : DragDropEffects.Move;
}
// If tab order UI is being shown, then don't allow anything to be dropped here.
IMenuCommandService ms = (IMenuCommandService)GetService(typeof(IMenuCommandService));
if (ms is not null)
{
MenuCommand tabCommand = ms.FindCommand(StandardCommands.TabOrder);
Debug.Assert(tabCommand is not null, "Missing tab order command");
if (tabCommand is not null && tabCommand.Checked)
{
de.Effect = DragDropEffects.None;
return;
}
}
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host?.GetDesigner(host.RootComponent) is DocumentDesigner parentDesigner)
{
if (!parentDesigner.CanDropComponents(de))
{
de.Effect = DragDropEffects.None;
return;
}
}
if (_mouseDragTool is not null)
{
Debug.Assert((de.AllowedEffect & DragDropEffects.Copy) != 0, "DragDropEffect.Move isn't allowed?");
de.Effect = DragDropEffects.Copy;
return;
}
}
/// <summary>
/// Called in response to the left mouse button being pressed on a
/// component. The designer overrides this to provide a
/// "lasso" selection for components within the control.
/// </summary>
private static int FrameWidth(FrameStyle style)
{
return (style == FrameStyle.Dashed ? 1 : 2);
}
protected override void OnMouseDragBegin(int x, int y)
{
Control control = Control;
// Figure out the drag frame style. We use a dotted line for selecting
// a component group, and a thick line for creating a new component.
// If we are a privately inherited component, then we always use the
// selection frame because we can't add components.
if (!InheritanceAttribute.Equals(InheritanceAttribute.InheritedReadOnly))
{
_toolboxService ??= (IToolboxService)GetService(typeof(IToolboxService));
if (_toolboxService is not null)
{
_mouseDragTool = _toolboxService.GetSelectedToolboxItem((IDesignerHost)GetService(typeof(IDesignerHost)));
}
}
// Set the mouse capture and clipping to this control.
control.Capture = true;
_mouseDragFrame = (_mouseDragTool is null) ? FrameStyle.Dashed : FrameStyle.Thick;
// Setting this non-null signifies that we are dragging with the mouse.
_mouseDragBase = new Point(x, y);
// Select the given object.
ISelectionService selsvc = (ISelectionService)GetService(typeof(ISelectionService));
selsvc?.SetSelectedComponents(new object[] { Component }, SelectionTypes.Primary);
// Get the event handler service. We push a handler to handle the escape
// key.
IEventHandlerService eventSvc = (IEventHandlerService)GetService(typeof(IEventHandlerService));
// UNDONE: Behavior Work
// Debug.Assert(escapeHandler == null, "Why is there already an escape handler?");
if (eventSvc is not null && _escapeHandler is null)
{
_escapeHandler = new EscapeHandler(this);
eventSvc.PushHandler(_escapeHandler);
}
// Need this since we are drawing the frame in the adorner window
_adornerWindowToScreenOffset = BehaviorService.AdornerWindowToScreen();
}
/// <summary>
/// Called at the end of a drag operation. This either commits or rolls back the
/// drag.
/// </summary>
// Standard 'catch all - rethrow critical' exception pattern
protected override void OnMouseDragEnd(bool cancel)
{
// Do nothing if we're not dragging anything around
if (_mouseDragBase == InvalidPoint)
{
Debug.Assert(_graphics is null);
// make sure we force the drag end
base.OnMouseDragEnd(cancel);
return;
}
// Important to null these out here, just in case we throw an exception
Rectangle offset = _mouseDragOffset;
ToolboxItem tool = _mouseDragTool;
Point baseVar = _mouseDragBase;
_mouseDragOffset = Rectangle.Empty;
_mouseDragBase = InvalidPoint;
_mouseDragTool = null;
Control.Capture = false;
Cursor.Clip = Rectangle.Empty;
// Clear out the drag frame.
if (!offset.IsEmpty && _graphics is not null)
{
Rectangle frameRect = new(offset.X - _adornerWindowToScreenOffset.X,
offset.Y - _adornerWindowToScreenOffset.Y,
offset.Width, offset.Height);
int frameWidth = FrameWidth(_mouseDragFrame);
_graphics.SetClip(frameRect);
using (Region newRegion = new(frameRect))
{
newRegion.Exclude(Rectangle.Inflate(frameRect, -frameWidth, -frameWidth));
BehaviorService.Invalidate(newRegion);
}
_graphics.ResetClip();
}
if (_graphics is not null)
{
_graphics.Dispose();
_graphics = null;
}
// destroy the snapline engine (if we used it)
if (_dragManager is not null)
{
_dragManager.OnMouseUp();
_dragManager = null;
}
// Get the event handler service and pop our handler.
IEventHandlerService eventSvc = (IEventHandlerService)GetService(typeof(IEventHandlerService));
if (eventSvc is not null && _escapeHandler is not null)
{
eventSvc.PopHandler(_escapeHandler);
_escapeHandler = null;
}
// Set Status Information - but only if the offset is not empty, if it is, the user didn't move the mouse
if (_statusCommandUI is not null && !offset.IsEmpty)
{
Point location = new(baseVar.X, baseVar.Y);
location = Control.PointToClient(location);
_statusCommandUI?.SetStatusInformation(new Rectangle(location.X, location.Y, offset.Width, offset.Height));
}
// Quit now if we don't have an offset rect. This indicates that the user didn't move the mouse.
if (offset.IsEmpty && !cancel)
{
// BUT, if we have a selected tool, create it here
if (tool is not null)
{
try
{
CreateTool(tool, baseVar);
_toolboxService?.SelectedToolboxItemUsed();
}
catch (Exception e) when (!e.IsCriticalException())
{
DisplayError(e);
}
}
return;
}
// Don't do anything else if the user wants to cancel.
if (cancel)
{
return;
}
// If we have a valid toolbox item, create the tool
if (tool is not null)
{
try
{
// avoid allowing the user creating a 1x1 sized control (for ex)
// by enforcing a min size 2xMinDragSize...
Size minControlSize = new(DesignerUtils.MinDragSize.Width * 2, DesignerUtils.MinDragSize.Height * 2);
if (offset.Width < minControlSize.Width)
{
offset.Width = minControlSize.Width;
}
if (offset.Height < minControlSize.Height)
{
offset.Height = minControlSize.Height;
}
CreateTool(tool, offset);
_toolboxService?.SelectedToolboxItemUsed();
}
catch (Exception e) when (!e.IsCriticalException())
{
DisplayError(e);
}
}
else
{
// Now find the set of controls within this offset and select them.
var selSvc = (ISelectionService)GetService(typeof(ISelectionService));
if (selSvc is not null)
{
List<Control> selection = GetComponentsInRect(offset, true, false /*component does not need to be fully contained*/);
if (selection.Count > 0)
{
selSvc.SetSelectedComponents(selection);
}
}
}
}
/// <summary>
/// Called for each movement of the mouse. This will check to see if a drag operation
/// is in progress. If so, it will pass the updated drag dimensions on to the selection
/// UI service.
/// </summary>
protected override void OnMouseDragMove(int x, int y)
{
// if we pushed a snapline behavior during a drag operation - make sure we have popped it
// if we're now receiving mouse move messages.
if (_toolboxItemSnapLineBehavior is not null && _toolboxItemSnapLineBehavior.IsPushed)
{
BehaviorService.PopBehavior(_toolboxItemSnapLineBehavior);
_toolboxItemSnapLineBehavior.IsPushed = false;
}
// if we're doing an OLE drag, do nothing, or
// Do nothing if we haven't initiated a drag
if (GetOleDragHandler().Dragging || _mouseDragBase == InvalidPoint)
{
return;
}
Rectangle oldFrameRect = _mouseDragOffset;
// Calculate the new offset.
_mouseDragOffset.X = _mouseDragBase.X;
_mouseDragOffset.Y = _mouseDragBase.Y;
_mouseDragOffset.Width = x - _mouseDragBase.X;
_mouseDragOffset.Height = y - _mouseDragBase.Y;
// if we have a valid dragtool - then we'll spin up our snapline engine
// and use it when the user drags a reversible rect -- but only if the
// parentcontroldesigner wants to allow Snaplines
if (_dragManager is null && ParticipatesWithSnapLines && _mouseDragTool is not null && BehaviorService.UseSnapLines)
{
_dragManager = new DragAssistanceManager(Component.Site);
}
if (_dragManager is not null)
{
// here, we build up our new rect (offset by the adorner window)
// and ask the snapline engine to adjust our coords
Rectangle r = new(_mouseDragBase.X - _adornerWindowToScreenOffset.X,
_mouseDragBase.Y - _adornerWindowToScreenOffset.Y,
x - _mouseDragBase.X, y - _mouseDragBase.Y);
Point offset = _dragManager.OnMouseMove(r, GenerateNewToolSnapLines(r));
_mouseDragOffset.Width += offset.X;
_mouseDragOffset.Height += offset.Y;
_dragManager.RenderSnapLinesInternal();
}
if (_mouseDragOffset.Width < 0)
{
_mouseDragOffset.X += _mouseDragOffset.Width;
_mouseDragOffset.Width = -_mouseDragOffset.Width;
}
if (_mouseDragOffset.Height < 0)
{
_mouseDragOffset.Y += _mouseDragOffset.Height;
_mouseDragOffset.Height = -_mouseDragOffset.Height;
}
// If we're dragging out a new component, update the drag rectangle
// to use snaps, if they're set.
if (_mouseDragTool is not null)
{
// To snap properly, we must snap in client coordinates. So, convert, snap
// and re-convert.
_mouseDragOffset = Control.RectangleToClient(_mouseDragOffset);
_mouseDragOffset = GetUpdatedRect(Rectangle.Empty, _mouseDragOffset, true);
_mouseDragOffset = Control.RectangleToScreen(_mouseDragOffset);
}
_graphics ??= BehaviorService.AdornerWindowGraphics;
// And draw the new drag frame
if (!_mouseDragOffset.IsEmpty && _graphics is not null)
{
Rectangle frameRect = new(_mouseDragOffset.X - _adornerWindowToScreenOffset.X,
_mouseDragOffset.Y - _adornerWindowToScreenOffset.Y,
_mouseDragOffset.Width, _mouseDragOffset.Height);
// graphics.SetClip(frameRect);
// draw the new border
using Region newRegion = new(frameRect);
int frameWidth = FrameWidth(_mouseDragFrame);
newRegion.Exclude(Rectangle.Inflate(frameRect, -frameWidth, -frameWidth));
// erase the right part of the old frame
if (!oldFrameRect.IsEmpty)
{
oldFrameRect.X -= _adornerWindowToScreenOffset.X;
oldFrameRect.Y -= _adornerWindowToScreenOffset.Y;
// Let's not try and be smart about invalidating just the part of the old frame
// that's not part of the new frame. When I did that (using the commented out
// lines below), you could get serious screen artifacts when dragging fast. I think
// this might be because of some bad region forming (bad region, bad), or some missing
// updates.
// Since we invalidate and then immediately redraw, the flicker should be minimal.
using Region oldRegion = new(oldFrameRect);
oldRegion.Exclude(Rectangle.Inflate(oldFrameRect, -frameWidth, -frameWidth));
// oldRegion.Union(newRegion);
// oldRegion.Exclude(newRegion);
BehaviorService.Invalidate(oldRegion);
}
DesignerUtils.DrawFrame(_graphics, newRegion, _mouseDragFrame, Control.BackColor);
// graphics.ResetClip();
}
// We are looking at the primary control
if (_statusCommandUI is not null)
{
Point offset = new(_mouseDragOffset.X, _mouseDragOffset.Y);
offset = Control.PointToClient(offset);
_statusCommandUI?.SetStatusInformation(new Rectangle(offset.X, offset.Y, _mouseDragOffset.Width, _mouseDragOffset.Height));
}
}
/// <summary>
/// Called after our component has finished painting. Here we draw our grid surface
/// </summary>
protected override void OnPaintAdornments(PaintEventArgs pe)
{
if (DrawGrid)
{
Control control = Control;
Rectangle displayRect = Control.DisplayRectangle;
Rectangle clientRect = Control.ClientRectangle;
Rectangle paintRect = new(Math.Min(displayRect.X, clientRect.X),
Math.Min(displayRect.Y, clientRect.Y),
Math.Max(displayRect.Width, clientRect.Width),
Math.Max(displayRect.Height, clientRect.Height));
float xlateX = paintRect.X;
float xlateY = paintRect.Y;
pe.Graphics.TranslateTransform(xlateX, xlateY);
paintRect.X = paintRect.Y = 0;
paintRect.Width++; // gpr: FillRectangle with a TextureBrush comes up one pixel short
paintRect.Height++;
ControlPaint.DrawGrid(pe.Graphics, paintRect, GridSize, control.BackColor);
pe.Graphics.TranslateTransform(-xlateX, -xlateY);
}
base.OnPaintAdornments(pe);
}
/// <summary>
/// When the control is scrolled, we want to invalidate areas previously covered by glyphs.
/// </summary>
private void OnScroll(object sender, ScrollEventArgs se)
{
BehaviorService.Invalidate(BehaviorService.ControlRectInAdornerWindow(Control));
}
/// <summary>
/// Called each time the cursor needs to be set. The ParentControlDesigner behavior here
/// will set the cursor to one of three things:
/// 1. If the toolbox service has a tool selected, it will allow the toolbox service to
/// set the cursor.
/// 2. The arrow will be set. Parent controls allow dragging within their interior.
/// </summary>
protected override void OnSetCursor()
{
_toolboxService ??= (IToolboxService)GetService(typeof(IToolboxService));
try
{
if (_toolboxService is null || !_toolboxService.SetCursor() || InheritanceAttribute.Equals(InheritanceAttribute.InheritedReadOnly))
{
Cursor.Current = Cursors.Default;
}
}
catch
{ // VSWhidbey 502536
Cursor.Current = Cursors.Default;
}
}
/// <summary>
/// Allows a designer to filter the set of properties
/// the component it is designing will expose through the
/// TypeDescriptor object. This method is called
/// immediately before its corresponding "Post" method.
/// If you are overriding this method you should call
/// the base implementation before you perform your own
/// filtering.
/// </summary>
protected override void PreFilterProperties(IDictionary properties)
{
base.PreFilterProperties(properties);
// add the "GridSize, SnapToGrid and DrawGrid" property from the property grid
// iff the LayoutOption.SnapToGrid Attribute is Set...
if (!DefaultUseSnapLines)
{
properties["DrawGrid"] = TypeDescriptor.CreateProperty(typeof(ParentControlDesigner), "DrawGrid", typeof(bool),
BrowsableAttribute.Yes,
DesignOnlyAttribute.Yes,
new SRDescriptionAttribute("ParentControlDesignerDrawGridDescr"),
CategoryAttribute.Design);
properties["SnapToGrid"] = TypeDescriptor.CreateProperty(typeof(ParentControlDesigner), "SnapToGrid", typeof(bool),
BrowsableAttribute.Yes,
DesignOnlyAttribute.Yes,
new SRDescriptionAttribute("ParentControlDesignerSnapToGridDescr"),
CategoryAttribute.Design);
properties["GridSize"] = TypeDescriptor.CreateProperty(typeof(ParentControlDesigner), "GridSize", typeof(Size),
BrowsableAttribute.Yes,
new SRDescriptionAttribute(SR.ParentControlDesignerGridSizeDescr),
DesignOnlyAttribute.Yes,
CategoryAttribute.Design);
}
// We need this one always to make sure that Format -> Horizontal/Vertical Spacing works.
properties["CurrentGridSize"] = TypeDescriptor.CreateProperty(typeof(ParentControlDesigner), "CurrentGridSize", typeof(Size),
BrowsableAttribute.No,
DesignerSerializationVisibilityAttribute.Hidden);
}
/// <summary>
/// Called after we have decided that the user has drawn a control (with a toolbox item picked) onto the designer
/// surface and intends to have the controls beneath the new one re-parented. Example: A user selects the 'Panel'
/// Control in the toolbox then drags a rectangle around four Buttons on the Form's surface. We'll attempt
/// to re-parent those four Buttons to the newly created Panel.
/// </summary>
private void ReParentControls(Control newParent, List<Control> controls, string transactionName, IDesignerHost host)
{
using DesignerTransaction dt = host.CreateTransaction(transactionName);
var changeService = GetService<IComponentChangeService>();
PropertyDescriptor controlsProp = TypeDescriptor.GetProperties(newParent)["Controls"];
PropertyDescriptor locationProp = TypeDescriptor.GetProperties(newParent)["Location"];
// get the location of our parent - so we can correctly offset the new lasso'd controls
// once they are re-parented
Point parentLoc = Point.Empty;
if (locationProp is not null)
{
parentLoc = (Point)locationProp.GetValue(newParent);
}
changeService?.OnComponentChanging(newParent, controlsProp);
// enumerate the lasso'd controls relocate and re-parent...
foreach (Control control in controls)
{
Control oldParent = control.Parent;
Point controlLoc = Point.Empty;
// do not want to reparent any control that is inherited readonly
InheritanceAttribute inheritanceAttribute = (InheritanceAttribute)TypeDescriptor.GetAttributes(control)[typeof(InheritanceAttribute)];
if (inheritanceAttribute is not null && inheritanceAttribute == InheritanceAttribute.InheritedReadOnly)
{
continue;
}
// get the current location of the control
PropertyDescriptor locProp = TypeDescriptor.GetProperties(control)["Location"];
if (locProp is not null)
{
controlLoc = (Point)locProp.GetValue(control);
}
// fire comp changing on parent and control
if (oldParent is not null)
{
changeService?.OnComponentChanging(oldParent, controlsProp);
// remove control from the old parent
oldParent.Controls.Remove(control);
}
// finally add & relocate the control with the new parent
newParent.Controls.Add(control);
Point newLoc = Point.Empty;
// this condition will determine which way we need to 'offset' our control location
// based on whether we are moving controls into a child or bringing them out to
// a parent
if (oldParent is not null)
{
if (oldParent.Controls.Contains(newParent))
{
newLoc = new Point(controlLoc.X - parentLoc.X, controlLoc.Y - parentLoc.Y);
}
else
{
Point oldParentLoc = (Point)locProp.GetValue(oldParent);
newLoc = new Point(controlLoc.X + oldParentLoc.X, controlLoc.Y + oldParentLoc.Y);
}
}
locProp.SetValue(control, newLoc);
// fire our comp changed events
if (changeService is not null && oldParent is not null)
{
changeService.OnComponentChanged(oldParent, controlsProp);
}
}
changeService?.OnComponentChanged(newParent, controlsProp);
// commit the transaction
dt.Commit();
}
/// <summary>
/// Determines if the DrawGrid property should be persisted.
/// </summary>
private bool ShouldSerializeDrawGrid()
{
// To determine if we need to persist this value, we first need to check
// if we have a parent who is a parentcontroldesigner, then get their
// setting...
ParentControlDesigner parent = GetParentControlDesignerOfParent();
if (parent is not null)
{
return !(DrawGrid == parent.DrawGrid);
}
// Otherwise, we'll compare the value to the options page...
return !IsOptionDefault("ShowGrid", DrawGrid);
}
/// <summary>
/// Determines if the SnapToGrid property should be persisted.
/// </summary>
private bool ShouldSerializeSnapToGrid()
{
// To determine if we need to persist this value, we first need to check
// if we have a parent who is a parentcontroldesigner, then get their
// setting...
ParentControlDesigner parent = GetParentControlDesignerOfParent();
if (parent is not null)
{
return !(SnapToGrid == parent.SnapToGrid);
}
// Otherwise, we'll compare the value to the options page...
return !IsOptionDefault("SnapToGrid", SnapToGrid);
}
/// <summary>
/// Determines if the GridSize property should be persisted.
/// </summary>
private bool ShouldSerializeGridSize()
{
// To determine if we need to persist this value, we first need to check
// if we have a parent who is a parentcontroldesigner, then get their
// setting...
ParentControlDesigner parent = GetParentControlDesignerOfParent();
if (parent is not null)
{
return !(GridSize.Equals(parent.GridSize));
}
// Otherwise, we'll compare the value to the options page...
return !IsOptionDefault("GridSize", GridSize);
}
private void ResetGridSize()
{
_getDefaultGridSize = true;
_parentCanSetGridSize = true;
// invalidate the control
Control control = Control;
control?.Invalidate(true);
}
private void ResetDrawGrid()
{
_getDefaultDrawGrid = true;
_parentCanSetDrawGrid = true;
// invalidate the control
Control control = Control;
control?.Invalidate(true);
}
private void ResetSnapToGrid()
{
_getDefaultGridSnap = true;
_parentCanSetGridSnap = true;
}
/// <internalonly/>
IComponent IOleDragClient.Component
{
get
{
return Component;
}
}
/// <internalonly/>
/// <summary>
/// Retrieves the control view instance for the designer that
/// is hosting the drag.
/// </summary>
bool IOleDragClient.AddComponent(IComponent component, string name, bool firstAdd)
{
IContainer container = DesignerUtils.CheckForNestedContainer(Component.Site.Container); // ...necessary to support SplitterPanel components
bool containerMove = true;
IContainer oldContainer = null;
IDesignerHost localDesignerHost = (IDesignerHost)GetService(typeof(IDesignerHost));
if (!firstAdd)
{
// just a move, so reparent
if (component.Site is not null)
{
oldContainer = component.Site.Container;
containerMove = container != oldContainer;
if (containerMove)
{
oldContainer.Remove(component);
}
}
if (containerMove)
{
// check if there's already a component by this name in the
// container
if (name is not null && container.Components[name] is not null)
{
name = null;
}
// add it back
if (name is not null)
{
container.Add(component, name);
}
else
{
container.Add(component);
}
}
}
// make sure this designer will accept this component -- we wait until
// now to be sure the components designer has been created.
if (!((IOleDragClient)this).IsDropOk(component))
{
try
{
IUIService uiSvc = (IUIService)GetService(typeof(IUIService));
string error = string.Format(SR.DesignerCantParentType, component.GetType().Name, Component.GetType().Name);
if (uiSvc is not null)
{
uiSvc.ShowError(error);
}
else
{
RTLAwareMessageBox.Show(null, error, null, MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1, 0);
}
return false;
}
finally
{
if (containerMove)
{
// move it back.
container.Remove(component);
oldContainer?.Add(component);
}
else
{
// there wad no container move ... but then this operation is not supported so
// just remove this component
container.Remove(component);
}
}
}
// this is a chance to display a more specific error messages than on IsDropOK failure
if (!CanAddComponent(component))
{
return false;
}
// make sure we can handle this thing, otherwise hand it to the base components designer
Control c = GetControl(component);
if (c is not null)
{
// set it's handler to this
Control parent = GetParentForComponent(component);
if (c is not Form form || !form.TopLevel)
{
if (c.Parent != parent)
{
PropertyDescriptor controlsProp = TypeDescriptor.GetProperties(parent)["Controls"];
// we want to insert rather than add it, so we add then move
// to the beginning
if (c.Parent is not null)
{
Control cParent = c.Parent;
_changeService?.OnComponentChanging(cParent, controlsProp);
cParent.Controls.Remove(c);
_changeService?.OnComponentChanged(cParent, controlsProp, cParent.Controls, cParent.Controls);
}
if (_suspendChanging == 0 && _changeService is not null)
{
_changeService.OnComponentChanging(parent, controlsProp);
}
parent.Controls.Add(c);
// sburke 78059 -- not sure why we need this call. this should move things to the beginning of the
// z-order, but do we need that?
// parent.Controls.SetChildIndex(c, 0);
_changeService?.OnComponentChanged(parent, controlsProp, parent.Controls, parent.Controls);
}
else
{
// here, we redo the add to make sure the handlers get setup right
int childIndex = parent.Controls.GetChildIndex(c);
parent.Controls.Remove(c);
parent.Controls.Add(c);
parent.Controls.SetChildIndex(c, childIndex);
}
}
c.Invalidate(true);
}
if (localDesignerHost is not null && containerMove)
{
// sburke -- looks like we always want to do this to ensure that sited children get
// handled properly. if we respected the boolean before, the ui selection handlers
// would cache designers, handlers, etc. and cause problems.
IComponentInitializer init = localDesignerHost.GetDesigner(component) as IComponentInitializer;
init?.InitializeExistingComponent(null);
AddChildComponents(component, container, localDesignerHost);
}
return true;
}
/// <internalonly/>
/// <summary>
/// Checks if the client is read only. That is, if components can
/// be added or removed from the designer.
/// </summary>
bool IOleDragClient.CanModifyComponents
{
get
{
return (!InheritanceAttribute.Equals(InheritanceAttribute.InheritedReadOnly));
}
}
/// <internalonly/>
/// <summary>
/// Checks if it is valid to drop this type of a component on this client.
/// </summary>
bool IOleDragClient.IsDropOk(IComponent component)
{
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if (host is not null)
{
IDesigner designer = host.GetDesigner(component);
bool disposeDesigner = false;
// we need to create one then
if (designer is null)
{
designer = TypeDescriptor.CreateDesigner(component, typeof(IDesigner));
ControlDesigner cd = designer as ControlDesigner;
if (cd is not null)
{
// Make sure the component doesn't get set to Visible
cd.ForceVisible = false;
}
designer.Initialize(component);
disposeDesigner = true;
}
try
{
ComponentDesigner cd = designer as ComponentDesigner;
if (cd is not null)
{
if (cd.CanBeAssociatedWith(this))
{
ControlDesigner controlDesigner = cd as ControlDesigner;
if (controlDesigner is not null)
{
return CanParent(controlDesigner);
}
}
else
{
return false;
}
}
}
finally
{
if (disposeDesigner)
{
designer.Dispose();
}
}
}
return true;
}
/// <internalonly/>
/// <summary>
/// Retrieves the control view instance for the designer that
/// is hosting the drag.
/// </summary>
Control IOleDragClient.GetDesignerControl()
{
return Control;
}
/// <internalonly/>
/// <summary>
/// Retrieves the control view instance for the given component.
/// For Win32 designer, this will often be the component itself.
/// </summary>
Control IOleDragClient.GetControlForComponent(object component)
{
return GetControl(component);
}
}
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