//declare a renderer, but do not initialize in here,
//because if current theme is classics, it will error
VisualStyleRenderer _barRenderer;
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
//eat WM_ERASEBKGND, and in WM_PAINT draw the background
case 0x14:
m.Result = (IntPtr)1;
return;
case 0xF://WM_PAINT
PAINTSTRUCT ps;
var hdc = BeginPaint(m.HWnd, out ps); //see MSDN
BufferedGraphics bg = null; //use memory graphics
try
{
var rect = ClientRectangle;
bg = BufferedGraphicsManager.Current.Allocate(hdc, rect);
//draw background
if (Application.RenderWithVisualStyles)
{
//just initialize renderer once
if (_barRenderer == null)
{
_barRenderer = new VisualStyleRenderer(VisualStyleElement.Status.Bar.Normal);
}
_barRenderer.DrawBackground(bg.Graphics, rect);
}
else
{
bg.Graphics.SetClip(rect); //not essential
bg.Graphics.Clear(SystemColors.Control);
}
//let system draw foreground, include texts, icons, separators etc
m.WParam = bg.Graphics.GetHdc(); //required, GetHdc() is not only obtain a dc handle,
base.WndProc(ref m); //it open a context for the dc, and let system draw on this context
bg.Graphics.ReleaseHdc(); //timely release
bg.Render();
return;
}
finally
{
if (bg != null) { bg.Dispose(); }
EndPaint(m.HWnd, ref ps); //see MSDN
}
}
base.WndProc(ref m);
}
#region Win32 API
[DllImport("user32.dll")]
private static extern IntPtr BeginPaint(IntPtr hWnd, out PAINTSTRUCT lpPaint);
[DllImport("user32.dll")]
private static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT lpPaint);
[StructLayout(LayoutKind.Sequential)]
private struct PAINTSTRUCT
{
public IntPtr hdc;
public bool fErase;
public RECT rcPaint;
public bool fRestore;
public bool fIncUpdate;
public int reserved1;
public int reserved2;
public int reserved3;
public int reserved4;
public int reserved5;
public int reserved6;
public int reserved7;
public int reserved8;
}
[StructLayout(LayoutKind.Sequential)]
private struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
}
#endregion
기본적으로 'DoubleBuffered = false'가 설정되어 있는데 왜 그렇게 설정합니까? 게다가 이중 버퍼를 사용하려면'false'가 아닌'true'로 설정해야합니다. –
나는 확실히 '사실'을 의미했다. 결정된. – Brannon
'StatusBar'에 무언가를 그립니다. 몇 가지 정보를 표시해야한다면'Label' 또는'Panel'을 커스터마이징 해보십시오. 너무 어렵지 않고 결코 깜박 거리지 않을 것입니다. –