c#渐变效果的窗体背景
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public enum WindowStyle : uint
{
WS_OVERLAPPED = 0x00000000,
WS_POPUP = 0x80000000,
WS_CHILD = 0x40000000,
WS_MINIMIZE = 0x20000000,
WS_VISIBLE = 0x10000000,
WS_DISABLED = 0x08000000,
WS_CLIPSIBLINGS = 0x04000000,
WS_CLIPCHILDREN = 0x02000000,
WS_MAXIMIZE = 0x01000000,
WS_CAPTION = 0x00C00000,
WS_BORDER = 0x00800000,
WS_DLGFRAME = 0x00400000,
WS_VSCROLL = 0x00200000,
WS_HSCROLL = 0x00100000,
WS_SYSMENU = 0x00080000,
WS_THICKFRAME = 0x00040000,
WS_GROUP = 0x00020000,
WS_TABSTOP = 0x00010000,
WS_MINIMIZEBOX = 0x00020000,
WS_MAXIMIZEBOX = 0x00010000,
WS_TILED = WS_OVERLAPPED,
WS_ICONIC = WS_MINIMIZE,
WS_SIZEBOX = WS_THICKFRAME,
WS_TILEDWINDOW = WS_OVERLAPPEDWINDOW,
WS_OVERLAPPEDWINDOW = (WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU |
WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX),
WS_POPUPWINDOW = (WS_POPUP | WS_BORDER | WS_SYSMENU),
WS_CHILDWINDOW = (WS_CHILD)
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
if (!DesignMode)
{
cp.ExStyle |= (int)WindowStyle.WS_CLIPCHILDREN;
}
return cp;
}
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
DrawFromAlphaMainPart(this, e.Graphics);
}
#region Private
/// <summary>
/// 绘制窗体主体部分白色透明层
/// </summary>
/// <param name="form"></param>
/// <param name="g"></param>
public static void DrawFromAlphaMainPart(Form form, Graphics g)
{
Color[] colors =
{
Color.FromArgb(5, Color.White),
Color.FromArgb(30, Color.White),
Color.FromArgb(145, Color.White),
Color.FromArgb(150, Color.White),
Color.FromArgb(30, Color.White),
Color.FromArgb(5, Color.White)
};
float[] pos =
{
0.0f,
0.04f,
0.10f,
0.90f,
0.97f,
1.0f
};
ColorBlend colorBlend = new ColorBlend(6);
colorBlend.Colors = colors;
colorBlend.Positions = pos;
RectangleF destRect = new RectangleF(0, 0, form.Width, form.Height);
using (LinearGradientBrush lBrush = new LinearGradientBrush(destRect, colors[0], colors[5], LinearGradientMode.Vertical))
{
lBrush.InterpolationColors = colorBlend;
g.FillRectangle(lBrush, destRect);
}
}
#endregion
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