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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.
// See the LICENSE file in the project root for more information.
using System.IO;
using System.Diagnostics;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Runtime.Versioning;
using SD = System.Drawing;
using SW = System.Windows;
using SWM = System.Windows.Media;
using MS.Win32;
namespace System.Windows.Forms.Integration
{
internal static class HostUtils
{
private const string DISPLAY = "DISPLAY";
private const int defaultPixelsPerInch = 96;
private static TraceSwitch imeModeTraceSwitch;
/// <summary>
/// IME context/mode trace switch.
/// </summary>
public static TraceSwitch ImeMode
{
get
{
if (imeModeTraceSwitch == null)
{
imeModeTraceSwitch = new TraceSwitch("ImeMode", "ImeMode Trace Switch");
}
return imeModeTraceSwitch;
}
}
// WinForms uses zero OR Int32.MaxValue to request content size.
// This method normalizes zeros to Int32.MaxValue.
public static SD.Size ConvertZeroToUnbounded(SD.Size size)
{
if (size.Width == 0) { size.Width = int.MaxValue; }
if (size.Height == 0) { size.Height = int.MaxValue; }
return size;
}
// Dock will request preferred size with one dimension set to 1.
public static SD.Size ConvertZeroOrOneToUnbounded(SD.Size size)
{
if (size.Width == 0 || size.Width == 1) { size.Width = int.MaxValue; }
if (size.Height == 0 || size.Height == 1) { size.Height = int.MaxValue; }
return size;
}
public static SD.Size ConvertUnboundedToZero(SD.Size size)
{
if (size.Width == int.MaxValue)
{
size.Width = 0;
}
if (size.Height == int.MaxValue)
{
size.Height = 0;
}
return size;
}
public static SD.Size UnionSizes(SD.Size size1, SD.Size size2)
{
return new SD.Size(
Math.Max(size1.Width, size2.Width),
Math.Max(size1.Height, size2.Height));
}
public static SD.Size IntersectSizes(SD.Size size1, SD.Size size2)
{
return new SD.Size(
Math.Min(size1.Width, size2.Width),
Math.Min(size1.Height, size2.Height));
}
internal static Visual GetRootVisual(Visual descendant)
{
DependencyObject current = descendant;
Visual root = descendant;
while (current != null)
{
current = VisualTreeHelper.GetParent(current);
Visual visual = current as Visual;
if (visual != null)
{
root = visual;
}
}
return root;
}
internal static Point TransformToRootPoint(Visual element, Point pointElement)
{
Visual rootVisual = GetRootVisual(element);
return TransformToParentPoint(element, rootVisual, pointElement);
}
internal static Point TransformToParentPoint(Visual element, Visual ancestor, Point pointElement)
{
GeneralTransform transform = element.TransformToAncestor(ancestor);
Point outPoint = new Point();
outPoint = transform.Transform(pointElement);
FrameworkElement rootElement = ancestor as FrameworkElement;
if (rootElement != null)
{
if (rootElement.LayoutTransform != null)
{
outPoint = rootElement.LayoutTransform.Transform(outPoint);
}
if (rootElement.RenderTransform != null)
{
outPoint = rootElement.RenderTransform.Transform(outPoint);
}
}
return outPoint;
}
/// <summary>
/// Returns true if the Brush is an opaque solid color. This is useful since
/// these colors are easily translated to WinForms.
/// </summary>
/// <param name="c"></param>
/// <returns></returns>
internal static bool BrushIsSolidOpaque(SWM.Brush c)
{
SWM.SolidColorBrush solid = c as SWM.SolidColorBrush;
return solid != null && solid.Color.A == 255;
}
internal static void SetBackgroundImage(WinFormsAdapter adapter, Control child, SD.Bitmap image)
{
if (child != null &&
(child.BackgroundImage == null || child.BackgroundImage == adapter.BackgroundImage))
{
child.BackgroundImage = image;
}
adapter.BackgroundImage = image;
}
[ResourceExposure(ResourceScope.Machine)]
// Resource consumption: GetBitmapForTransparentWindowsFormsHost and GetBitmapForOpaqueWindowsFormsHost.
[ResourceConsumption(ResourceScope.Machine)]
internal static SD.Bitmap GetBitmapForWindowsFormsHost(WindowsFormsHost host, Brush brush)
{
if (brush == Brushes.Transparent)
{
return GetBitmapForTransparentWindowsFormsHost(host);
}
else
{
return GetBitmapForOpaqueWindowsFormsHost(host, brush);
}
}
[ResourceExposure(ResourceScope.Machine)]
// Resource consumption: new Bitmap, which is machine-wide, and new PaintEventArgs, which is process-wide
[ResourceConsumption(ResourceScope.Machine | ResourceScope.Process, ResourceScope.Machine | ResourceScope.Process)]
internal static SD.Bitmap GetBitmapOfControl(Control control, ElementHost host)
{
if (control.ClientRectangle.Width == 0 || control.ClientRectangle.Height == 0)
{
return null;
}
SD.Bitmap bitmap = new SD.Bitmap(control.ClientRectangle.Width, control.ClientRectangle.Height);
using (SD.Graphics g = SD.Graphics.FromImage(bitmap))
{
using (PaintEventArgs args = new PaintEventArgs(g, control.ClientRectangle))
{
host.InvokePaintBackgroundAndPaint(control, args);
}
}
return bitmap;
}
[ResourceExposure(ResourceScope.Machine)]
// Resource consumption: new Bitmap, which is machine-wide, and Graphics.FromImage, which is process-wide
[ResourceConsumption(ResourceScope.Machine | ResourceScope.Process, ResourceScope.Machine | ResourceScope.Process)]
internal static SD.Bitmap GetCoveredPortionOfBitmap(Control parentControl, ElementHost childElementHost)
{
using (SD.Bitmap parentBitmap = GetBitmapOfControl(parentControl, childElementHost))
{
SD.Bitmap returnBitmap = new SD.Bitmap(childElementHost.ClientRectangle.Width, childElementHost.ClientRectangle.Height);
using (SD.Graphics g = SD.Graphics.FromImage(returnBitmap))
{
g.DrawImage(parentBitmap, -childElementHost.Left, -childElementHost.Top);
}
return returnBitmap;
}
}
private static FrameworkElement GetFrameworkElementAncestor(DependencyObject descendant)
{
FrameworkElement ancestor = null;
DependencyObject current = descendant;
while (current != null)
{
FrameworkElement currentElement = current as FrameworkElement;
if (currentElement != null) { ancestor = currentElement; }
current = VisualTreeHelper.GetParent(current);
}
return ancestor;
}
[ResourceExposure(ResourceScope.Machine)]
// Resource consumption: GetBitmapFromRenderTargetBitmap
[ResourceConsumption(ResourceScope.Machine)]
internal static SD.Bitmap GetBitmapForTransparentWindowsFormsHost(WindowsFormsHost host)
{
WinFormsAdapter adapter = WindowsFormsHostPropertyMap.GetAdapter(host);
if (adapter == null) { return null; }
//We need to find our highest-level ancestor that's a FrameworkElement:
//if it's not a FrameworkElement, we don't know how big it is, and can't
//properly deal with it.
FrameworkElement frameworkElementAncestor = GetFrameworkElementAncestor(host);
if (frameworkElementAncestor != null)
{
RenderTargetBitmap bmp = GetBitmapForFrameworkElement(frameworkElementAncestor);
Point hostPoint = new Point(0, 0);
Point parentPoint = new Point(0, 0);
if (HostUtils.IsRotated(host))
{
//Image is upside down. Need the lower right corner of host and the
//lower right corner of the parent.
hostPoint = HostUtils.TransformToParentPoint(host, frameworkElementAncestor,
new Point(host.ActualWidth, host.ActualHeight));
parentPoint = HostUtils.TransformToParentPoint(frameworkElementAncestor, frameworkElementAncestor,
new Point(frameworkElementAncestor.ActualWidth, frameworkElementAncestor.ActualHeight));
}
else
{
//Need upper left corner of host and the upper left corner of the parent.
hostPoint = HostUtils.TransformToParentPoint(host, frameworkElementAncestor,
new Point(0, 0));
parentPoint = HostUtils.TransformToParentPoint(frameworkElementAncestor, frameworkElementAncestor,
new Point(0, 0));
}
hostPoint.Offset(-parentPoint.X, -parentPoint.Y);
return GetBitmapFromRenderTargetBitmap(adapter, bmp, hostPoint);
}
return null;
}
internal static RenderTargetBitmap GetBitmapForFrameworkElement(FrameworkElement element)
{
RenderTargetBitmap bmp = GetRenderTargetBitmapForVisual(
(int)Math.Ceiling(element.ActualWidth),
(int)Math.Ceiling(element.ActualHeight),
element);
return bmp;
}
[ResourceExposure(ResourceScope.Machine)]
// Resource consumption: Image.FromStream is machine-wide, and control.CreateGraphics and Graphics.FromImage is process-wide
[ResourceConsumption(ResourceScope.Machine | ResourceScope.Process, ResourceScope.Machine | ResourceScope.Process)]
internal static SD.Bitmap GetBitmapFromRenderTargetBitmap(Control control, RenderTargetBitmap bmp, Point offset)
{
if (bmp == null)
{
return new SD.Bitmap(1, 1);
}
using (MemoryStream memoryStream = new System.IO.MemoryStream())
{
SD.Image newImage = null;
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmp));
encoder.Save(memoryStream);
memoryStream.Seek(0, System.IO.SeekOrigin.Begin);
using (newImage = SD.Image.FromStream(memoryStream))
using (SD.Graphics graphicsTemplate = control.CreateGraphics())
{
int width = control.Width <= 0 ? 1 : control.Width;
int height = control.Width <= 0 ? 1 : control.Height;
SD.Bitmap chunk = new System.Drawing.Bitmap(width, height, graphicsTemplate);
graphicsTemplate.Dispose();
using (SD.Graphics graphics = SD.Graphics.FromImage(chunk))
{
graphics.DrawImage(newImage, (float)-offset.X, (float)-offset.Y);
}
return chunk;
}
}
}
internal static RenderTargetBitmap GetRenderTargetBitmapForVisual(int width, int height, Visual visualToRender)
{
if (width < 1 || height < 1) { return null; }
RenderTargetBitmap bmp = new RenderTargetBitmap(
width,
height,
HostUtils.PixelsPerInch(Orientation.Horizontal),
HostUtils.PixelsPerInch(Orientation.Vertical),
PixelFormats.Pbgra32);
bmp.Render(visualToRender);
return bmp;
}
[ResourceExposure(ResourceScope.Machine)]
// Resource consumption: GetBitmapFromRenderTargetBitmap
[ResourceConsumption(ResourceScope.Machine)]
internal static SD.Bitmap GetBitmapForOpaqueWindowsFormsHost(WindowsFormsHost host, Brush brush)
{
WinFormsAdapter adapter = WindowsFormsHostPropertyMap.GetAdapter(host);
if (adapter == null) { return null; }
DrawingVisual drawingVisual = new DrawingVisual();
DrawingContext drawingContext = drawingVisual.RenderOpen();
drawingContext.DrawRectangle(brush, null, new Rect(0, 0, adapter.Width, adapter.Height));
drawingContext.Close();
RenderTargetBitmap bmp = GetRenderTargetBitmapForVisual(adapter.Width, adapter.Height, drawingVisual);
return GetBitmapFromRenderTargetBitmap(adapter, bmp, new Point(0, 0));
}
internal static Vector GetScale(Visual visual)
{
bool skewed;
return GetScale(visual, out skewed);
}
internal static Vector GetScale(Visual visual, out bool skewed)
{
// Determine whether WindowsFormsHost scaling has changed
Point pOrigin = HostUtils.TransformToRootPoint(visual, new Point(0.0, 0.0));
Point pX = HostUtils.TransformToRootPoint(visual, new Point(1.0, 0.0));
Point pY = HostUtils.TransformToRootPoint(visual, new Point(0.0, 1.0));
Vector xComponent = pX - pOrigin;
Vector yComponent = pY - pOrigin;
skewed = (!IsZero(xComponent.Y) || !IsZero(yComponent.X));
return new Vector(xComponent.Length, yComponent.Length);
}
internal static bool IsRotated(Visual visual)
{
// Determine whether WindowsFormsHost is rotated
Point pOrigin = HostUtils.TransformToRootPoint(visual, new Point(0.0, 0.0));
Point pX = HostUtils.TransformToRootPoint(visual, new Point(1.0, 0.0));
Point pY = HostUtils.TransformToRootPoint(visual, new Point(0.0, 1.0));
Vector xComponent = pX - pOrigin;
Vector yComponent = pY - pOrigin;
return xComponent.X < 0 || yComponent.Y < 0;
}
[ResourceExposure(ResourceScope.None)]
// Resource consumption: UnsafeNativeMethods.CreateDC
[ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
internal static int PixelsPerInch(Orientation orientation)
{
int nIndex = (orientation == Orientation.Horizontal ?
NativeMethods.LOGPIXELSX :
NativeMethods.LOGPIXELSY);
using (DCSafeHandle screenDC = UnsafeNativeMethods.CreateDC(DISPLAY))
{
return screenDC.IsInvalid ? defaultPixelsPerInch :
UnsafeNativeMethods.GetDeviceCaps(screenDC, nIndex);
}
}
//Doubles may return != 0 for a small delta: if it's really close to zero, just
//call it 0.
internal static bool IsZero(double value)
{
//See DoubleUtil.IsZero
const double DBL_EPSILON = 2.2204460492503131e-16; //smallest double such that 1.0+DBL_EPSILON != 1.0
return Math.Abs(value) < 10d * DBL_EPSILON;
}
internal static int LOWORD(IntPtr ptr)
{
return (int)((long)ptr & 0xffff);
}
/// <summary>
/// Determines whether a FontWeight should be considered bold (everything on
/// the dark side of Medium, including Medium)
/// </summary>
/// <param name="fontWeight"></param>
/// <returns></returns>
public static bool FontWeightIsBold(FontWeight fontWeight)
{
return fontWeight >= SW.FontWeights.Medium;
}
/// <summary>
/// Returns the first ancestor element in the visual tree that has Cursor set, or
/// ForceCursor if we're mapping it
/// </summary>
/// <param name="currentObject"></param>
/// <param name="forceCursorMapped"></param>
/// <returns></returns>
public static FrameworkElement GetCursorSource(DependencyObject currentObject, bool forceCursorMapped)
{
while (currentObject != null)
{
FrameworkElement currentElement = currentObject as FrameworkElement;
if (currentElement != null && (
currentElement.Cursor != null ||
(currentElement.ForceCursor && forceCursorMapped)
)
)
{
return currentElement;
}
currentObject = VisualTreeHelper.GetParent(currentObject);
}
return null;
}
}
}
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