private void InitializeThumbnail()
{
if (IntPtr.Zero != _thumb)
{
// release the old thumbnail
ReleaseThumbnail();
}
if (IntPtr.Zero == Handle)
{
return;
}
// find our parent hwnd
_target = (HwndSource)HwndSource.FromVisual(this);
// if we have one, we can attempt to register the thumbnail
if (_target == null || 0 != DwmUtils.DwmRegisterThumbnail(_target.Handle, Handle, out this._thumb))
{
return;
}
DwmThumbnailProperties props = new DwmThumbnailProperties();
props.Visible = false;
props.SourceClientAreaOnly = false;
props.Opacity = (byte)(255 * this.Opacity);
props.Flags = ThumbnailFlags.Visible |
ThumbnailFlags.SourceClientAreaOnly |
ThumbnailFlags.Opacity;
DwmUtils.DwmUpdateThumbnailProperties(_thumb, ref props);
}
private void LoadWindows(Dictionary <Guid, Desktop> desktops)
{
Dictionary <IntPtr, string> windows = DwmUtils.LoadWindows();
foreach (KeyValuePair <IntPtr, string> entry in windows)
{
var vDesktop = VirtualDesktop.FromHwnd(entry.Key);
if (vDesktop == null)
{
continue;
// vDesktop = VirtualDesktop.Current; // show in current desktop as fallback ??
}
Desktop desktop;
if (!desktops.TryGetValue(vDesktop.Id, out desktop))
{
// this desktop is not in out desktops dict, how can a window be not in the dict of all desktops??
MessageBox.Show(this, "Found window in non-existent desktop!");
return;
}
var windowItem = new WindowItem(entry.Key, entry.Value);
desktop.windows.Add(windowItem);
}
foreach (var desktop in desktops)
{
List <WindowItem> desktopWindows = desktop.Value.windows;
Grid grid = CreateGrid(desktopWindows.Count);
ShowWindowsInDesktop(desktopWindows, grid, desktop.Value);
}
}
private void InitialiseThumbnail(IntPtr source)
{
if (IntPtr.Zero != thumb)
{
// release the old thumbnail
ReleaseThumbnail();
}
if (IntPtr.Zero != source)
{
// find our parent hwnd
target = (HwndSource)HwndSource.FromVisual(this);
// if we have one, we can attempt to register the thumbnail
if (target != null && 0 == DwmUtils.DwmRegisterThumbnail(target.Handle, source, out this.thumb))
{
DwmThumbnailProperties props = new DwmThumbnailProperties();
props.Visible = false;
props.SourceClientAreaOnly = this.ClientAreaOnly;
props.Opacity = (byte)(255 * this.Opacity);
props.Flags = ThumbnailFlags.Visible | ThumbnailFlags.SourceClientAreaOnly
| ThumbnailFlags.Opacity;
DwmUtils.DwmUpdateThumbnailProperties(thumb, ref props);
}
}
}
// this is where the magic happens
private void Thumbnail_LayoutUpdated(object sender, EventArgs e)
{
if (IntPtr.Zero == thumb)
{
InitialiseThumbnail(this.Source);
}
if (IntPtr.Zero != thumb)
{
if (!target.RootVisual.IsAncestorOf(this))
{
//we are no longer in the visual tree
ReleaseThumbnail();
return;
}
GeneralTransform transform = TransformToAncestor(target.RootVisual);
Point a = transform.Transform(new Point(0, 0));
Point b = transform.Transform(new Point(this.ActualWidth, this.ActualHeight));
DwmThumbnailProperties props = new DwmThumbnailProperties();
props.Visible = true;
props.Destination = new Rect(
(int)Math.Ceiling(a.X), (int)Math.Ceiling(a.Y),
(int)Math.Ceiling(b.X), (int)Math.Ceiling(b.Y));
props.Flags = ThumbnailFlags.Visible | ThumbnailFlags.RectDetination;
DwmUtils.DwmUpdateThumbnailProperties(thumb, ref props);
}
}
public void DrawRectForWindow()
{
if (IntPtr.Zero == _thumb)
{
InitializeThumbnail();
}
if (IntPtr.Zero == _thumb)
{
return;
}
if (!_target.RootVisual.IsAncestorOf(this))
{
//we are no longer in the visual tree
ReleaseThumbnail();
return;
}
double scale = DwmUtils.GetSystemScale();
// keep original window aspect ratio
double windowWidth = WindowRect.Right - WindowRect.Left;
double windowHeight = WindowRect.Bottom - WindowRect.Top;
Point origin = new Point(Canvas.GetLeft(this), Canvas.GetTop(this));
double scaleFactor = Height / windowHeight;
windowHeight = scaleFactor * windowHeight;
windowWidth = scaleFactor * windowWidth;
// origins remain the same as provided
var rect = new Rect(
(int)(origin.X),
(int)(origin.Y),
(int)(origin.X + windowWidth),
(int)(origin.Y + windowHeight));
var scaledRect = new Rect(
(int)(origin.X * scale),
(int)(origin.Y * scale),
(int)((origin.X + windowWidth) * scale),
(int)((origin.Y + windowHeight) * scale));
DwmThumbnailProperties props = new DwmThumbnailProperties();
props.Visible = true;
props.Destination = scaledRect;
// props.Destination = new DWM.Rect(
// (int) Math.Ceiling(a.X), (int) Math.Ceiling(a.Y),
// (int) Math.Ceiling(b.X), (int) Math.Ceiling(b.Y));
props.Flags = ThumbnailFlags.Visible | ThumbnailFlags.RectDetination;
DwmUtils.DwmUpdateThumbnailProperties(_thumb, ref props);
}
private void UpdateThumbnail()
{
if (IntPtr.Zero != thumb)
{
DwmThumbnailProperties props = new DwmThumbnailProperties();
props.SourceClientAreaOnly = this.ClientAreaOnly;
props.Opacity = (byte)(255 * this.Opacity);
props.Flags = ThumbnailFlags.SourceClientAreaOnly | ThumbnailFlags.Opacity;
DwmUtils.DwmUpdateThumbnailProperties(thumb, ref props);
}
}
protected override Size ArrangeOverride(Size finalSize)
{
Psize size;
DwmUtils.DwmQueryThumbnailSourceSize(this.thumb, out size);
// scale to fit whatever size we were allocated
double scale = finalSize.Width / size.Width;
scale = Math.Min(scale, finalSize.Height / size.Height);
return(new Size(size.Width * scale, size.Height * scale));
}
public WindowItem(IntPtr handle, string title)
{
this.Handle = handle;
this.Title = title;
BorderBrush = Brushes.OrangeRed;
BorderThickness = new Thickness(2);
// Using this makes clicking work inside the box
Background = new SolidColorBrush(Colors.Blue);
Background.Opacity = 1;
DwmUtils.GetWindowRect(handle, out WindowRect);
// clicking only works inside the WindowItem bounds
this.MouseLeftButtonUp += (sender, args) => {
DwmUtils.SetForegroundWindow(handle);
};
// this.LayoutUpdated += new EventHandler(OnLayoutUpdated);
// this.Unloaded += new RoutedEventHandler(OnUnloaded);
}
protected override Size MeasureOverride(Size availableSize)
{
Psize size;
DwmUtils.DwmQueryThumbnailSourceSize(this.thumb, out size);
double scale = 1;
// our preferred size is the thumbnail source size
// if less space is available, we scale appropriately
if (size.Width > availableSize.Width)
{
scale = availableSize.Width / size.Width;
}
if (size.Height > availableSize.Height)
{
scale = Math.Min(scale, availableSize.Height / size.Height);
}
return(new Size(size.Width * scale, size.Height * scale));
;
}
private void ReleaseThumbnail()
{
DwmUtils.DwmUnregisterThumbnail(_thumb);
this._thumb = IntPtr.Zero;
this._target = null;
}
