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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.
using System.Collections.Specialized;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Globalization;
using System.Reflection;
using System.Runtime.InteropServices;
using Windows.Win32.System.Com;
using Windows.Win32.System.Ole;
namespace System.Windows.Forms;
/// <summary>
/// Wraps ActiveX controls and exposes them as fully featured windows forms controls
/// (by inheriting from Control). Some of Control's properties that don't make sense
/// for ActiveX controls are blocked here (by setting Browsable attributes on some and
/// throwing exceptions from others), to make life easy for the inheritors.
///
/// Inheritors of this class simply need to concentrate on defining and implementing the
/// properties/methods/events of the specific ActiveX control they are wrapping, the
/// default properties etc and the code to implement the activation etc. are
/// encapsulated in the class below.
///
/// The classid of the ActiveX control is specified in the constructor.
/// </summary>
[DefaultProperty(nameof(Name))]
[DefaultEvent(nameof(Enter))]
[Designer($"System.Windows.Forms.Design.AxDesigner, {AssemblyRef.SystemDesign}")]
public unsafe partial class WebBrowserBase : Control
{
private WebBrowserHelper.AXState _axState = WebBrowserHelper.AXState.Passive;
private WebBrowserHelper.AXState _axReloadingState = WebBrowserHelper.AXState.Passive;
private WebBrowserHelper.AXEditMode _axEditMode = WebBrowserHelper.AXEditMode.None;
private BitVector32 _axHostState;
private WebBrowserHelper.SelectionStyle _selectionStyle = WebBrowserHelper.SelectionStyle.NotSelected;
private WebBrowserSiteBase? _axSite;
private ContainerControl? _containingControl;
private EventHandler? _selectionChangeHandler;
private readonly Guid _clsid;
// Pointers to the ActiveX object: Interface pointers are cached for perf.
private IOleObject.Interface? _axOleObject;
private IOleInPlaceObject.Interface? _axOleInPlaceObject;
private IOleInPlaceActiveObject.Interface? _axOleInPlaceActiveObject;
private IOleControl.Interface? _axOleControl;
private WebBrowserBaseNativeWindow? _axWindow;
// We need to change the size of the inner ActiveX control before the
// WebBrowserBase control's size is changed (i.e., before WebBrowserBase.Bounds
// is changed) for better visual effect. We use this field to know what size
// the WebBrowserBase control is changing to.
private Size _webBrowserBaseChangingSize = Size.Empty;
private WebBrowserContainer? _wbContainer;
// This flags the WebBrowser not to process dialog keys when the ActiveX control is doing it
// and calls back into the WebBrowser for some reason.
private bool _ignoreDialogKeys;
//
// Internal fields:
//
internal WebBrowserContainer? _container;
internal object? _activeXInstance;
/// <summary>
/// Creates a new instance of a WinForms control which wraps an ActiveX control
/// given by the clsid parameter.
/// </summary>
internal WebBrowserBase(string clsidString) : base()
{
if (Application.OleRequired() != ApartmentState.STA)
{
throw new ThreadStateException(string.Format(SR.AXMTAThread, clsidString));
}
SetStyle(ControlStyles.UserPaint, false);
_clsid = new Guid(clsidString);
_webBrowserBaseChangingSize.Width = -1; // Invalid value. Use WebBrowserBase.Bounds instead, when this is the case.
SetAXHostState(WebBrowserHelper.s_isMaskEdit, _clsid.Equals(WebBrowserHelper.s_maskEdit_Clsid));
}
//
// Public properties:
//
/// <summary>
/// Returns the native webbrowser object that this control wraps.
/// </summary>
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public object? ActiveXInstance => _activeXInstance;
//
// Virtual methods:
//
// The following are virtual methods that derived-classes can override
//
//
// The native ActiveX control QI's for interfaces on it's site to see if
// it needs to change its behavior. Since the WebBrowserSiteBaseBase class is generic,
// it only implements site interfaces that are generic to all sites. QI's
// for any more specific interfaces will fail. This is a problem if anyone
// wants to support any other interfaces on the site. In order to overcome
// this, one needs to extend WebBrowserSiteBaseBase and implement any additional interfaces
// needed.
//
// ActiveX wrapper controls that derive from this class should override the
// below method and return their own WebBrowserSiteBaseBase derived object.
//
/// <summary>
/// Returns an object that will be set as the site for the native ActiveX control.
/// Implementors of the site can derive from <see cref="WebBrowserSiteBase"/> class.
/// </summary>
protected virtual WebBrowserSiteBase CreateWebBrowserSiteBase()
{
return new WebBrowserSiteBase(this);
}
/// <summary>
/// This will be called when the native ActiveX control has just been created.
/// Inheritors of this class can override this method to cast the nativeActiveXObject
/// parameter to the appropriate interface. They can then cache this interface
/// value in a member variable. However, they must release this value when
/// DetachInterfaces is called (by setting the cached interface variable to null).
/// </summary>
protected virtual void AttachInterfaces(object nativeActiveXObject)
{
}
/// <summary>
/// See AttachInterfaces for a description of when to override DetachInterfaces.
/// </summary>
protected virtual void DetachInterfaces()
{
}
/// <summary>
/// This will be called when we are ready to start listening to events.
/// Inheritors can override this method to hook their own connection points.
/// </summary>
protected virtual void CreateSink()
{
}
/// <summary>
/// This will be called when it is time to stop listening to events.
/// This is where inheritors have to disconnect their connection points.
/// </summary>
protected virtual void DetachSink()
{
}
// DrawToBitmap doesn't work for this control, so we should hide it. We'll
// still call base so that this has a chance to work if it can.
[EditorBrowsable(EditorBrowsableState.Never)]
public new void DrawToBitmap(Bitmap bitmap, Rectangle targetBounds)
{
base.DrawToBitmap(bitmap, targetBounds);
}
//
// Overriding methods: Overrides of some of Control's virtual methods.
//
//
// Sets the site of this component. A non-null value indicates that this
// component has been added to a container, and a null value indicates that
// this component is being removed from a container.
//
public override ISite? Site
{
set
{
bool hadSelectionHandler = RemoveSelectionHandler();
base.Site = value;
if (hadSelectionHandler)
{
AddSelectionHandler();
}
}
}
/// <remarks>
/// <para>We have to resize the ActiveX control when our size changes.</para>
/// </remarks>
internal override unsafe void OnBoundsUpdate(int x, int y, int width, int height)
{
// If the ActiveX control is already InPlaceActive, make sure
// it's bounds also change.
if (ActiveXState >= WebBrowserHelper.AXState.InPlaceActive)
{
try
{
_webBrowserBaseChangingSize.Width = width;
_webBrowserBaseChangingSize.Height = height;
RECT posRect = new Rectangle(0, 0, width, height);
RECT clipRect = WebBrowserHelper.GetClipRect();
AXInPlaceObject!.SetObjectRects(&posRect, &clipRect);
}
finally
{
_webBrowserBaseChangingSize.Width = -1; // Invalid value. Use WebBrowserBase.Bounds instead, when this is the case.
}
}
base.OnBoundsUpdate(x, y, width, height);
}
protected override bool ProcessDialogKey(Keys keyData) =>
!_ignoreDialogKeys && base.ProcessDialogKey(keyData);
public override unsafe bool PreProcessMessage(ref Message msg)
{
// Let us assume that TAB key was pressed. In this case, we should first
// give a chance to the ActiveX control to see if it wants to change focus
// to other subitems within it. If we did not give the ActiveX control the
// first chance to handle the key stroke, and called base.PreProcessMessage,
// the focus would be changed to the next control on the form! We don't want
// that
// If the ActiveX control doesn't want to handle the key, it calls back into
// WebBrowserSiteBase's IOleControlSite.TranslateAccelerator implementation. There, we
// set a flag and call back into this method. In this method, we first check
// if this flag is set. If so, we call base.PreProcessMessage.
if (!IsUserMode)
{
return false;
}
if (GetAXHostState(WebBrowserHelper.s_siteProcessedInputKey))
{
// In this case, the control called us back through IOleControlSite
// and is now giving us a chance to see if we want to process it.
return base.PreProcessMessage(ref msg);
}
// Convert Message to MSG
MSG win32Message = msg;
SetAXHostState(WebBrowserHelper.s_siteProcessedInputKey, false);
try
{
if (_axOleInPlaceObject is null)
{
return false;
}
// Give the ActiveX control a chance to process this key by calling
// IOleInPlaceActiveObject::TranslateAccelerator.
HRESULT hr = _axOleInPlaceActiveObject!.TranslateAccelerator(&win32Message);
if (hr == HRESULT.S_OK)
{
return true;
}
else
{
// win32Message may have been modified. Lets copy it back.
msg.MsgInternal = (MessageId)win32Message.message;
msg.WParamInternal = win32Message.wParam;
msg.LParamInternal = win32Message.lParam;
msg.HWnd = win32Message.hwnd;
if (hr == HRESULT.S_FALSE)
{
// Same code as in AxHost (ignore dialog keys here).
// We have the same problem here.
bool ret = false;
_ignoreDialogKeys = true;
try
{
ret = base.PreProcessMessage(ref msg);
}
finally
{
_ignoreDialogKeys = false;
}
return ret;
}
else if (GetAXHostState(WebBrowserHelper.s_siteProcessedInputKey))
{
return base.PreProcessMessage(ref msg);
}
else
{
return false;
}
}
}
finally
{
SetAXHostState(WebBrowserHelper.s_siteProcessedInputKey, false);
}
}
//
// Process a mnemonic character. This is done by manufacturing a
// WM_SYSKEYDOWN message and passing it to the ActiveX control.
//
// We can't decide just by ourselves whether we can process the
// mnemonic. We have to ask the ActiveX control for it.
//
protected internal override unsafe bool ProcessMnemonic(char charCode)
{
if (!CanSelect)
{
return false;
}
bool processed = false;
try
{
CONTROLINFO controlInfo = new()
{
cb = (uint)sizeof(CONTROLINFO)
};
if (_axOleControl!.GetControlInfo(&controlInfo).Failed)
{
return processed;
}
// We don't have a message so we must create one ourselves.
// The message we are creating is a WM_SYSKEYDOWN with the right alt key setting.
MSG msg = new()
{
hwnd = HWND.Null,
message = PInvoke.WM_SYSKEYDOWN,
wParam = (WPARAM)char.ToUpper(charCode, CultureInfo.CurrentCulture),
lParam = 0x20180001,
time = PInvoke.GetTickCount()
};
PInvoke.GetCursorPos(out Point p);
msg.pt = p;
if (!PInvoke.IsAccelerator(new HandleRef<HACCEL>(this, controlInfo.hAccel), controlInfo.cAccel, &msg, lpwCmd: null))
{
_axOleControl.OnMnemonic(&msg);
Focus();
processed = true;
}
}
catch (Exception ex) when (!ex.IsCriticalException())
{
Debug.Fail($"error in processMnemonic: {ex}");
}
return processed;
}
/// <remarks>
/// <para>
/// Certain messages are forwardef directly to the ActiveX control, others are first processed by the wndproc of
/// <see cref="Control"/>.
/// </para>
/// </remarks>
protected override unsafe void WndProc(ref Message m)
{
switch (m.MsgInternal)
{
// Things we explicitly ignore and pass to the ActiveX's windproc
case PInvoke.WM_ERASEBKGND:
case MessageId.WM_REFLECT_NOTIFYFORMAT:
case PInvoke.WM_SETCURSOR:
case PInvoke.WM_SYSCOLORCHANGE:
case PInvoke.WM_LBUTTONDBLCLK:
case PInvoke.WM_LBUTTONUP:
case PInvoke.WM_MBUTTONDBLCLK:
case PInvoke.WM_MBUTTONUP:
case PInvoke.WM_RBUTTONDBLCLK:
case PInvoke.WM_RBUTTONUP:
case PInvoke.WM_CONTEXTMENU:
//
// Some of the MSComCtl controls respond to this message to do some
// custom painting. So, we should just pass this message through.
case PInvoke.WM_DRAWITEM:
DefWndProc(ref m);
break;
case PInvoke.WM_COMMAND:
if (!ReflectMessage(m.LParamInternal, ref m))
{
DefWndProc(ref m);
}
break;
case PInvoke.WM_HELP:
// We want to both fire the event, and let the ActiveX have the message...
base.WndProc(ref m);
DefWndProc(ref m);
break;
case PInvoke.WM_LBUTTONDOWN:
case PInvoke.WM_MBUTTONDOWN:
case PInvoke.WM_RBUTTONDOWN:
case PInvoke.WM_MOUSEACTIVATE:
if (!DesignMode)
{
if (_containingControl is not null && _containingControl.ActiveControl != this)
{
Focus();
}
}
DefWndProc(ref m);
break;
case PInvoke.WM_DESTROY:
//
// If we are currently in a state of InPlaceActive or above,
// we should first reparent the ActiveX control to our parking
// window before we transition to a state below InPlaceActive.
// Otherwise we face all sorts of problems when we try to
// transition back to a state >= InPlaceActive.
//
if (ActiveXState >= WebBrowserHelper.AXState.InPlaceActive)
{
HWND hwndInPlaceObject = HWND.Null;
if (AXInPlaceObject!.GetWindow(&hwndInPlaceObject).Succeeded)
{
Application.ParkHandle(new HandleRef<HWND>(AXInPlaceObject, hwndInPlaceObject), DpiAwarenessContext);
}
}
if (RecreatingHandle)
{
_axReloadingState = _axState;
}
//
// If the ActiveX control was holding on to our handle we need
// to get it to throw it away. This, we do by transitioning it
// down below InPlaceActivate (because it is when transitioning
// up to InPlaceActivate that the ActiveX control grabs our handle).
TransitionDownTo(WebBrowserHelper.AXState.Running);
_axWindow?.ReleaseHandle();
OnHandleDestroyed(EventArgs.Empty);
break;
default:
if (m.MsgInternal == WebBrowserHelper.REGMSG_MSG)
{
m.ResultInternal = (LRESULT)WebBrowserHelper.REGMSG_RETVAL;
}
else
{
base.WndProc(ref m);
}
break;
}
}
protected override void OnParentChanged(EventArgs e)
{
Control? parent = ParentInternal;
if ((Visible && parent is not null && parent.Visible) || IsHandleCreated)
{
TransitionUpTo(WebBrowserHelper.AXState.InPlaceActive);
}
base.OnParentChanged(e);
}
protected override void OnVisibleChanged(EventArgs e)
{
if (Visible && !Disposing && !IsDisposed)
{
TransitionUpTo(WebBrowserHelper.AXState.InPlaceActive);
}
base.OnVisibleChanged(e);
}
protected override void OnGotFocus(EventArgs e)
{
if (ActiveXState < WebBrowserHelper.AXState.UIActive)
{
TransitionUpTo(WebBrowserHelper.AXState.UIActive);
}
base.OnGotFocus(e);
}
protected override void OnLostFocus(EventArgs e)
{
base.OnLostFocus(e);
// If the focus goes from our control window to one of the child windows,
// we should not deactivate.
if (!ContainsFocus)
{
TransitionDownTo(WebBrowserHelper.AXState.InPlaceActive);
}
}
protected override void OnRightToLeftChanged(EventArgs e)
{
// Do nothing: no point in recreating the handle when we don't obey RTL
}
//
// Can't select the control until the ActiveX control is InPlaceActive.
//
internal override bool CanSelectCore()
{
return ActiveXState >= WebBrowserHelper.AXState.InPlaceActive && base.CanSelectCore();
}
internal override bool AllowsKeyboardToolTip()
{
return false;
}
//
// We have to inform the ActiveX control that an ambient property
// has changed.
//
protected override void OnFontChanged(EventArgs e)
{
base.OnFontChanged(e);
AmbientChanged(PInvokeCore.DISPID_AMBIENT_FONT);
}
//
// We have to inform the ActiveX control that an ambient property
// has changed.
//
protected override void OnForeColorChanged(EventArgs e)
{
base.OnForeColorChanged(e);
AmbientChanged(PInvokeCore.DISPID_AMBIENT_FORECOLOR);
}
//
// We have to inform the ActiveX control that an ambient property
// has changed.
//
protected override void OnBackColorChanged(EventArgs e)
{
base.OnBackColorChanged(e);
AmbientChanged(PInvokeCore.DISPID_AMBIENT_BACKCOLOR);
}
//
// TransitionDownTo Passive when we are being disposed.
//
protected override void Dispose(bool disposing)
{
if (disposing)
{
TransitionDownTo(WebBrowserHelper.AXState.Passive);
}
base.Dispose(disposing);
}
//
// Internal helper methods:
//
internal WebBrowserHelper.AXState ActiveXState
{
get => _axState;
set => _axState = value;
}
internal bool GetAXHostState(int mask) => _axHostState[mask];
internal void SetAXHostState(int mask, bool value) => _axHostState[mask] = value;
internal IntPtr GetHandleNoCreate() => IsHandleCreated ? Handle : IntPtr.Zero;
internal void TransitionUpTo(WebBrowserHelper.AXState state)
{
if (GetAXHostState(WebBrowserHelper.s_inTransition))
{
return;
}
SetAXHostState(WebBrowserHelper.s_inTransition, true);
try
{
while (state > ActiveXState)
{
switch (ActiveXState)
{
case WebBrowserHelper.AXState.Passive:
TransitionFromPassiveToLoaded();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Loaded, "Failed transition");
break;
case WebBrowserHelper.AXState.Loaded:
TransitionFromLoadedToRunning();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Running, "Failed transition");
break;
case WebBrowserHelper.AXState.Running:
TransitionFromRunningToInPlaceActive();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.InPlaceActive, "Failed transition");
break;
case WebBrowserHelper.AXState.InPlaceActive:
TransitionFromInPlaceActiveToUIActive();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.UIActive, "Failed transition");
break;
default:
Debug.Fail("bad state");
ActiveXState++; // To exit the loop
break;
}
}
}
finally
{
SetAXHostState(WebBrowserHelper.s_inTransition, false);
}
}
internal void TransitionDownTo(WebBrowserHelper.AXState state)
{
if (!GetAXHostState(WebBrowserHelper.s_inTransition))
{
SetAXHostState(WebBrowserHelper.s_inTransition, true);
try
{
while (state < ActiveXState)
{
switch (ActiveXState)
{
case WebBrowserHelper.AXState.UIActive:
TransitionFromUIActiveToInPlaceActive();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.InPlaceActive, "Failed transition");
break;
case WebBrowserHelper.AXState.InPlaceActive:
TransitionFromInPlaceActiveToRunning();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Running, "Failed transition");
break;
case WebBrowserHelper.AXState.Running:
TransitionFromRunningToLoaded();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Loaded, "Failed transition");
break;
case WebBrowserHelper.AXState.Loaded:
TransitionFromLoadedToPassive();
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Passive, "Failed transition");
break;
default:
Debug.Fail("bad state");
ActiveXState--; // To exit the loop
break;
}
}
}
finally
{
SetAXHostState(WebBrowserHelper.s_inTransition, false);
}
}
}
internal unsafe bool DoVerb(OLEIVERB verb)
{
RECT posRect = Bounds;
using var clientSite = ComHelpers.GetComScope<IOleClientSite>(ActiveXSite);
HRESULT hr = _axOleObject!.DoVerb((int)verb, null, clientSite, 0, HWND, &posRect);
Debug.Assert(hr.Succeeded, $"DoVerb call failed for verb 0x{verb}");
return hr.Succeeded;
}
//
// Returns this control's logically containing form.
// At design time this is always the form being designed.
// At runtime it is the parent form.
// By default, the parent form performs that function. It is
// however possible for another form higher in the parent chain
// to serve in that role. The logical container of this
// control determines the set of logical sibling control.
// This property exists only to enable some specific
// behaviors of ActiveX controls.
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Advanced)]
internal ContainerControl? ContainingControl
{
get
{
if (_containingControl is null ||
GetAXHostState(WebBrowserHelper.s_recomputeContainingControl))
{
_containingControl = FindContainerControlInternal();
}
return _containingControl;
}
}
internal WebBrowserContainer CreateWebBrowserContainer() =>
_wbContainer ??= new WebBrowserContainer(this);
internal WebBrowserContainer GetParentContainer()
{
_container ??= WebBrowserContainer.FindContainerForControl(this);
if (_container is null)
{
_container = CreateWebBrowserContainer();
_container.AddControl(this);
}
return _container;
}
internal void SetEditMode(WebBrowserHelper.AXEditMode em)
{
_axEditMode = em;
}
internal void SetSelectionStyle(WebBrowserHelper.SelectionStyle selectionStyle)
{
if (DesignMode)
{
ISelectionService? iss = WebBrowserHelper.GetSelectionService(this);
_selectionStyle = selectionStyle;
if (iss is not null && iss.GetComponentSelected(this))
{
// The ActiveX Host designer will offer an extender property
// called "SelectionStyle"
PropertyDescriptor? prop = TypeDescriptor.GetProperties(this)["SelectionStyle"];
if (prop is not null && prop.PropertyType == typeof(int))
{
prop.SetValue(this, (int)selectionStyle);
}
}
}
}
internal void AddSelectionHandler()
{
if (!GetAXHostState(WebBrowserHelper.s_addedSelectionHandler))
{
SetAXHostState(WebBrowserHelper.s_addedSelectionHandler, true);
ISelectionService? iss = WebBrowserHelper.GetSelectionService(this);
if (iss is not null)
{
iss.SelectionChanging += SelectionChangeHandler;
}
}
}
internal bool RemoveSelectionHandler()
{
bool retVal = GetAXHostState(WebBrowserHelper.s_addedSelectionHandler);
if (retVal)
{
SetAXHostState(WebBrowserHelper.s_addedSelectionHandler, false);
ISelectionService? iss = WebBrowserHelper.GetSelectionService(this);
if (iss is not null)
{
iss.SelectionChanging -= SelectionChangeHandler;
}
}
return retVal;
}
internal void AttachWindow(HWND hwnd)
{
PInvoke.SetParent(hwnd, this);
_axWindow?.ReleaseHandle();
_axWindow = new WebBrowserBaseNativeWindow(this);
_axWindow.AssignHandle(hwnd, false);
UpdateZOrder();
UpdateBounds();
Size extent = Size;
extent = SetExtent(extent.Width, extent.Height);
Point location = Location;
Bounds = new Rectangle(location.X, location.Y, extent.Width, extent.Height);
}
internal bool IsUserMode => Site is null || !DesignMode;
internal void MakeDirty()
{
if (Site.TryGetService(out IComponentChangeService? changeService))
{
changeService.OnComponentChanging(this);
changeService.OnComponentChanged(this);
}
}
internal int NoComponentChangeEvents { get; set; }
//
// Private helper methods:
//
private void StartEvents()
{
if (!GetAXHostState(WebBrowserHelper.s_sinkAttached))
{
SetAXHostState(WebBrowserHelper.s_sinkAttached, true);
CreateSink();
}
ActiveXSite.StartEvents();
}
private void StopEvents()
{
if (GetAXHostState(WebBrowserHelper.s_sinkAttached))
{
SetAXHostState(WebBrowserHelper.s_sinkAttached, false);
DetachSink();
}
ActiveXSite.StopEvents();
}
private void TransitionFromPassiveToLoaded()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Passive, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.Passive)
{
// First, create the ActiveX control
Debug.Assert(_activeXInstance is null, "activeXInstance must be null");
HRESULT hr = PInvokeCore.CoCreateInstance(
in _clsid,
null,
CLSCTX.CLSCTX_INPROC_SERVER,
IID.GetRef<IUnknown>(),
out void* unknown);
hr.ThrowOnFailure();
_activeXInstance = ComHelpers.GetObjectForIUnknown((IUnknown*)unknown);
Debug.Assert(_activeXInstance is not null, "w/o an exception being thrown we must have an object...");
// We are now loaded.
ActiveXState = WebBrowserHelper.AXState.Loaded;
// Lets give them a chance to cast the ActiveX object to the appropriate interfaces.
AttachInterfacesInternal();
}
}
private void TransitionFromLoadedToPassive()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Loaded, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.Loaded)
{
// Need to make sure that we don't handle any PropertyChanged notifications at this point.
NoComponentChangeEvents++;
try
{
// Release the activeXInstance
if (_activeXInstance is not null)
{
// Lets first get the cached interface pointers of activeXInstance released.
DetachInterfacesInternal();
Marshal.FinalReleaseComObject(_activeXInstance);
_activeXInstance = null;
}
}
finally
{
NoComponentChangeEvents--;
}
// We are now Passive.
ActiveXState = WebBrowserHelper.AXState.Passive;
}
}
private unsafe void TransitionFromLoadedToRunning()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Loaded, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.Loaded)
{
// See if the ActiveX control returns OLEMISC_SETCLIENTSITEFIRST
HRESULT hr = _axOleObject.GetMiscStatus(DVASPECT.DVASPECT_CONTENT, out OLEMISC bits);
if (hr.Succeeded && bits.HasFlag(OLEMISC.OLEMISC_SETCLIENTSITEFIRST))
{
// Simply setting the site to the ActiveX control should activate it.
// And this will take us to the Running state.
_axOleObject!.SetClientSite(ComHelpers.GetComPointer<IOleClientSite>(ActiveXSite));
}
// We start receiving events now (but we do this only if we are not in DesignMode).
if (!DesignMode)
{
StartEvents();
}
// We are now Running.
ActiveXState = WebBrowserHelper.AXState.Running;
}
}
private unsafe void TransitionFromRunningToLoaded()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Running, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.Running)
{
StopEvents();
// Remove ourselves from our parent container...
WebBrowserContainer parentContainer = GetParentContainer();
parentContainer?.RemoveControl(this);
// Now inform the ActiveX control that it's been un-sited.
_axOleObject!.SetClientSite(null);
// We are now Loaded!
ActiveXState = WebBrowserHelper.AXState.Loaded;
}
}
private void TransitionFromRunningToInPlaceActive()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.Running, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.Running)
{
try
{
DoVerb(OLEIVERB.OLEIVERB_INPLACEACTIVATE);
}
catch (Exception t)
{
throw new TargetInvocationException(string.Format(SR.AXNohWnd, GetType().Name), t);
}
CreateControl(true);
//
// We are now InPlaceActive!
ActiveXState = WebBrowserHelper.AXState.InPlaceActive;
}
}
private void TransitionFromInPlaceActiveToRunning()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.InPlaceActive, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.InPlaceActive)
{
// First, lets make sure we transfer the ContainingControl's ActiveControl
// before we InPlaceDeactivate.
ContainerControl? containingControl = ContainingControl;
if (containingControl is not null && containingControl.ActiveControl == this)
{
containingControl.SetActiveControl(null);
}
// Now, InPlaceDeactivate.
AXInPlaceObject!.InPlaceDeactivate();
// We are now Running!
ActiveXState = WebBrowserHelper.AXState.Running;
}
}
private void TransitionFromInPlaceActiveToUIActive()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.InPlaceActive, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.InPlaceActive)
{
try
{
DoVerb(OLEIVERB.OLEIVERB_UIACTIVATE);
}
catch (Exception t)
{
throw new TargetInvocationException(string.Format(SR.AXNohWnd, GetType().Name), t);
}
//
// We are now UIActive
ActiveXState = WebBrowserHelper.AXState.UIActive;
}
}
private void TransitionFromUIActiveToInPlaceActive()
{
Debug.Assert(ActiveXState == WebBrowserHelper.AXState.UIActive, "Wrong start state to transition from");
if (ActiveXState == WebBrowserHelper.AXState.UIActive)
{
HRESULT hr = AXInPlaceObject!.UIDeactivate();
Debug.Assert(hr.Succeeded, "Failed to UIDeactivate");
// We are now InPlaceActive
ActiveXState = WebBrowserHelper.AXState.InPlaceActive;
}
}
internal WebBrowserSiteBase ActiveXSite =>
_axSite ??= CreateWebBrowserSiteBase();
private void AttachInterfacesInternal()
{
Debug.Assert(_activeXInstance is not null, "The native control is null");
_axOleObject = (IOleObject.Interface)_activeXInstance;
_axOleInPlaceObject = (IOleInPlaceObject.Interface)_activeXInstance;
_axOleInPlaceActiveObject = (IOleInPlaceActiveObject.Interface)_activeXInstance;
_axOleControl = (IOleControl.Interface)_activeXInstance;
// Give the inheriting classes a chance to cast the ActiveX object to the
// appropriate interfaces.
AttachInterfaces(_activeXInstance);
}
private void DetachInterfacesInternal()
{
_axOleObject = null;
_axOleInPlaceObject = null;
_axOleInPlaceActiveObject = null;
_axOleControl = null;
// Lets give the inheriting classes a chance to release
// their cached interfaces of the ActiveX object.
DetachInterfaces();
}
// We need to change the ActiveX control's state when selection changes.
private EventHandler SelectionChangeHandler => _selectionChangeHandler ??= OnNewSelection;
// We need to do special stuff (convert window messages to interface calls)
// during design time when selection changes.
private void OnNewSelection(object? sender, EventArgs e)
{
if (DesignMode)
{
ISelectionService? iss = WebBrowserHelper.GetSelectionService(this);
if (iss is not null)
{
// We are no longer selected.
if (!iss.GetComponentSelected(this))
{
// We need to exit editmode if we were in one.
if (EditMode)
{
GetParentContainer().OnExitEditMode(this);
SetEditMode(WebBrowserHelper.AXEditMode.None);
}
SetSelectionStyle(WebBrowserHelper.SelectionStyle.Selected);
RemoveSelectionHandler();
}
else
{
//
// The AX Host designer will offer an extender property called "SelectionStyle"
PropertyDescriptor? prop = TypeDescriptor.GetProperties(this)["SelectionStyle"];
if (prop is not null && prop.PropertyType == typeof(int))
{
int curSelectionStyle = (int)prop.GetValue(this)!;
if (curSelectionStyle != (int)_selectionStyle)
{
prop.SetValue(this, _selectionStyle);
}
}
}
}
}
}
private unsafe Size SetExtent(int width, int height)
{
Size sz = new(width, height);
bool resetExtents = DesignMode;
Pixel2hiMetric(ref sz);
HRESULT hr = _axOleObject!.SetExtent(DVASPECT.DVASPECT_CONTENT, (SIZE*)&sz);
if (hr != HRESULT.S_OK)
{
resetExtents = true;
}
if (resetExtents)
{
_axOleObject.GetExtent(DVASPECT.DVASPECT_CONTENT, (SIZE*)&sz);
_axOleObject.SetExtent(DVASPECT.DVASPECT_CONTENT, (SIZE*)&sz);
}
return GetExtent();
}
private unsafe Size GetExtent()
{
Size size = default;
_axOleObject!.GetExtent(DVASPECT.DVASPECT_CONTENT, (SIZE*)&size);
HiMetric2Pixel(ref size);
return size;
}
private unsafe void HiMetric2Pixel(ref Size sz)
{
Point phm = new(sz.Width, sz.Height);
PointF pcont = default;
((IOleControlSite.Interface)ActiveXSite).TransformCoords(
(POINTL*)&phm,
&pcont,
(uint)(XFORMCOORDS.XFORMCOORDS_SIZE | XFORMCOORDS.XFORMCOORDS_HIMETRICTOCONTAINER));
sz.Width = (int)pcont.X;
sz.Height = (int)pcont.Y;
}
private unsafe void Pixel2hiMetric(ref Size sz)
{
Point phm = default;
PointF pcont = new(sz.Width, sz.Height);
((IOleControlSite.Interface)ActiveXSite).TransformCoords(
(POINTL*)&phm,
&pcont,
(uint)(XFORMCOORDS.XFORMCOORDS_SIZE | XFORMCOORDS.XFORMCOORDS_CONTAINERTOHIMETRIC));
sz.Width = phm.X;
sz.Height = phm.Y;
}
private bool EditMode =>
_axEditMode != WebBrowserHelper.AXEditMode.None;
// Find the uppermost ContainerControl that this control lives in
internal ContainerControl? FindContainerControlInternal()
{
if (Site.TryGetService(out IDesignerHost? host) && host.RootComponent is ContainerControl rootContainerControl)
{
return rootContainerControl;
}
ContainerControl? containerControl = null;
for (Control? control = this; control is not null; control = control.ParentInternal)
{
if (control is ContainerControl tempCC)
{
containerControl = tempCC;
}
}
if (containerControl is null && IsHandleCreated)
{
containerControl = FromHandle(PInvoke.GetParent(this)) as ContainerControl;
}
// Never use the parking window for this: its hwnd can be destroyed at any time.
if (containerControl is Application.ParkingWindow)
{
containerControl = null;
}
SetAXHostState(WebBrowserHelper.s_recomputeContainingControl, containerControl is null);
return containerControl;
}
private void AmbientChanged(int dispid)
{
if (_activeXInstance is not null)
{
Invalidate();
HRESULT result = _axOleControl!.OnAmbientPropertyChange(dispid);
Debug.Assert(!result.Failed, $"{result}");
}
}
internal IOleInPlaceObject.Interface? AXInPlaceObject => _axOleInPlaceObject;
// ---------------------------------------------------------------
// The following properties implemented in the Control class don't make
// sense for ActiveX controls. So we block them here.
// ---------------------------------------------------------------
//
// Overridden properties:
//
protected override Size DefaultSize => new(75, 23);
//
// Overridden methods:
//
protected override bool IsInputChar(char charCode)
{
return true;
}
/// <summary>
/// Inheriting classes should override this method to find out when the
/// handle has been created. Call base.OnHandleCreated first.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Advanced)]
protected override void OnHandleCreated(EventArgs e)
{
//
// This is needed to prevent some controls (for e.g. Office Web Components) from
// failing to InPlaceActivate() when they call RegisterDragDrop() but do not call
// OleInitialize(). The EE calls CoInitializeEx() on the thread, but I believe
// that is not good enough for DragDrop.
//
if (Application.OleRequired() != ApartmentState.STA)
{
throw new ThreadStateException(SR.ThreadMustBeSTA);
}
base.OnHandleCreated(e);
// make sure we restore whatever running state we had prior to the handle recreate.
//
if (_axReloadingState != WebBrowserHelper.AXState.Passive && _axReloadingState != _axState)
{
if (_axState < _axReloadingState)
{
TransitionUpTo(_axReloadingState);
}
else
{
TransitionDownTo(_axReloadingState);
}
_axReloadingState = WebBrowserHelper.AXState.Passive;
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override Color BackColor
{
get => base.BackColor;
set => base.BackColor = value;
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[AllowNull]
public override Font Font
{
get => base.Font;
set => base.Font = value;
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override Color ForeColor
{
get => base.ForeColor;
set => base.ForeColor = value;
}
/// <summary>
/// Hide ImeMode: it doesn't make sense for this control
/// </summary>
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public new ImeMode ImeMode
{
get => base.ImeMode;
set => base.ImeMode = value;
}
//
// Properties blocked at design time and run time:
//
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override bool AllowDrop
{
get => base.AllowDrop;
set
{
throw new NotSupportedException(SR.WebBrowserAllowDropNotSupported);
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override Image? BackgroundImage
{
get => base.BackgroundImage;
set
{
throw new NotSupportedException(SR.WebBrowserBackgroundImageNotSupported);
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override ImageLayout BackgroundImageLayout
{
get => base.BackgroundImageLayout;
set
{
throw new NotSupportedException(SR.WebBrowserBackgroundImageLayoutNotSupported);
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[AllowNull]
public override Cursor Cursor
{
get => base.Cursor;
set
{
throw new NotSupportedException(SR.WebBrowserCursorNotSupported);
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public new bool Enabled
{
get => base.Enabled;
set
{
throw new NotSupportedException(SR.WebBrowserEnabledNotSupported);
}
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[Localizable(false)]
public override RightToLeft RightToLeft
{
get => RightToLeft.No;
set
{
throw new NotSupportedException(SR.WebBrowserRightToLeftNotSupported);
}
}
// Override this property so that the Bindable attribute can be set to false.
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[Bindable(false)]
[AllowNull]
public override string Text
{
get => string.Empty;
set => throw new NotSupportedException(SR.WebBrowserTextNotSupported);
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public new bool UseWaitCursor
{
get => base.UseWaitCursor;
set
{
throw new NotSupportedException(SR.WebBrowserUseWaitCursorNotSupported);
}
}
//
// Unavailable events
//
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? BackgroundImageLayoutChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "BackgroundImageLayoutChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? Enter
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "Enter"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? Leave
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "Leave"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? MouseCaptureChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseCaptureChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event MouseEventHandler? MouseClick
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseClick"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event MouseEventHandler? MouseDoubleClick
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseDoubleClick"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? BackColorChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "BackColorChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? BackgroundImageChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "BackgroundImageChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? BindingContextChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "BindingContextChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? CursorChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "CursorChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? EnabledChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "EnabledChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? FontChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "FontChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? ForeColorChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "ForeColorChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? RightToLeftChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "RightToLeftChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? TextChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "TextChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? Click
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "Click"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event DragEventHandler? DragDrop
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "DragDrop"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event DragEventHandler? DragEnter
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "DragEnter"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event DragEventHandler? DragOver
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "DragOver"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? DragLeave
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "DragLeave"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event GiveFeedbackEventHandler? GiveFeedback
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "GiveFeedback"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
// Everett
public new event HelpEventHandler? HelpRequested
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "HelpRequested"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event PaintEventHandler? Paint
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "Paint"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event QueryContinueDragEventHandler? QueryContinueDrag
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "QueryContinueDrag"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event QueryAccessibilityHelpEventHandler? QueryAccessibilityHelp
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "QueryAccessibilityHelp"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? DoubleClick
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "DoubleClick"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? ImeModeChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "ImeModeChanged"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event KeyEventHandler? KeyDown
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "KeyDown"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event KeyPressEventHandler? KeyPress
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "KeyPress"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event KeyEventHandler? KeyUp
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "KeyUp"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event LayoutEventHandler? Layout
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "Layout"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event MouseEventHandler? MouseDown
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseDown"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? MouseEnter
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseEnter"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? MouseLeave
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseLeave"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? MouseHover
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseHover"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event MouseEventHandler? MouseMove
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseMove"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event MouseEventHandler? MouseUp
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseUp"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event MouseEventHandler? MouseWheel
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "MouseWheel"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event UICuesEventHandler? ChangeUICues
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "ChangeUICues"));
remove { }
}
[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
public new event EventHandler? StyleChanged
{
add => throw new NotSupportedException(string.Format(SR.AXAddInvalidEvent, "StyleChanged"));
remove { }
}
}
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