玻璃不正确

Question

我制作了一张表格并将玻璃杯延伸到下面，如下图所示。但是当我移动窗口所以并非所有窗口都在屏幕上可见时，我将其移回后玻璃渲染是错误的：

如何处理这个窗口才能正确呈现？

这是我的代码：

[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 );
        }
}

Answer 1

我认为CreateGraphics让你感到悲伤。

尝试重写OnPaint方法并使用PaintEventArgs中的Graphic对象：

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));
}

如果要调整表单大小，请将其添加到构造函数中：

public Form1() {
  InitializeComponent();
  this.ResizeRedraw = true;
}

或覆盖Resize事件：

protected override void OnResize(EventArgs e) {
  base.OnResize(e);
  this.Invalidate();
}

Answer 2

以下调用必须在您的OnPaint方法

中

FillRectangle( new SolidBrush( Color.Black ), new Rectangle( 0, this.ClientSize.Height - 32, this.ClientSize.Width, 32 ) );

剩下的只需做一次。而不是调用CreateGraphics（）使用OnPaint的参数（e.Graphics）