I made a form and extended the glass in it like in the image below. But when I move the window so not all of it is visible on screen, the glass rendering is wrong after I move it back:
How can I handle this so the window is rendered correctly?
This is my code:
[DllImport( "dwmapi.dll" )]
private static extern void DwmExtendFrameIntoClientArea( IntPtr hWnd, ref Margins mg );
[DllImport( "dwmapi.dll" )]
private static extern void DwmIsCompositionEnabled( out bool enabled );
public struct Margins{
public int Left;
public int Right;
public int Top;
public int Bottom;
}
private void Form1_Shown( object sender, EventArgs e ) {
this.CreateGraphics().FillRectangle( new SolidBrush( Color.Black ), new Rectangle( 0, this.ClientSize.Height - 32, this.ClientSize.Width, 32 ) );
bool isGlassEnabled = false;
Margins margin;
margin.Top = 0;
margin.Left = 0;
margin.Bottom = 32;
margin.Right = 0;
DwmIsCompositionEnabled( out isGlassEnabled );
if (isGlassEnabled) {
DwmExtendFrameIntoClientArea( this.Handle, ref margin );
}
}
I think the CreateGraphics is causing you some grief here.
Try overriding the OnPaint method and use the Graphic object from the PaintEventArgs instead:
protected override void OnShown(EventArgs e) {
base.OnShown(e);
bool isGlassEnabled = false;
Margins margin;
margin.Top = 0;
margin.Left = 0;
margin.Bottom = 32;
margin.Right = 0;
DwmIsCompositionEnabled(out isGlassEnabled);
if (isGlassEnabled) {
DwmExtendFrameIntoClientArea(this.Handle, ref margin);
}
}
protected override void OnPaint(PaintEventArgs e) {
base.OnPaint(e);
e.Graphics.FillRectangle(Pens.Black,
new Rectangle(0, this.ClientSize.Height - 32, this.ClientSize.Width, 32));
}
If resizing the form, either add this to the constructor:
public Form1() {
InitializeComponent();
this.ResizeRedraw = true;
}
or override the Resize event:
protected override void OnResize(EventArgs e) {
base.OnResize(e);
this.Invalidate();
}