WPF当窗体WindowStyle=”None”时，最大化会覆盖掉任务栏。如何解决这个问题呢？
我在Google里面搜到一篇文章，要用到Win32 API，通过让WPF窗体WM_GETMINMAXINFO消息挂接一个钩子来处理。
public static void RepairWindowBehavior(Window wpfWindow)
{
if (wpfWindow == null)
return;
wpfWindow.SourceInitialized += delegate
{
IntPtr handle = (new WindowInteropHelper(wpfWindow)).Handle;
HwndSource source = HwndSource.FromHwnd(handle);
if (source != null)
{
source.AddHook(WindowProc);
}
};
}
private static IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case 0x0024:
WmGetMinMaxInfo(hwnd, lParam);
handled = true;
break;
}
return (IntPtr)0;
}
private static void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam)
{
MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
int MONITOR_DEFAULTTONEAREST = 0x00000002;
IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
if (monitor != IntPtr.Zero)
{
MONITORINFO monitorInfo = new MONITORINFO();
GetMonitorInfo(monitor, monitorInfo);
RECT rcWorkArea = monitorInfo.rcWork;
RECT rcMonitorArea = monitorInfo.rcMonitor;
mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left);
mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top);
mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top);
}
Marshal.StructureToPtr(mmi, lParam, true);
}
[DllImport("user32")]
internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
[DllImport("User32")]
internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);
#region Nested type: MINMAXINFO
[StructLayout(LayoutKind.Sequential)]
internal struct MINMAXINFO
{
public POINT ptReserved;
public POINT ptMaxSize;
public POINT ptMaxPosition;
public POINT ptMinTrackSize;
public POINT ptMaxTrackSize;
}
#endregion
#region Nested type: MONITORINFO
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
internal class MONITORINFO
{
public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));
public RECT rcMonitor;
public RECT rcWork;
public int dwFlags;
}
#endregion
#region Nested type: POINT
[StructLayout(LayoutKind.Sequential)]
internal struct POINT
{
public int x;
public int y;
public POINT(int x, int y)
{
this.x = x;
this.y = y;
}
}
#endregion
#region Nested type: RECT
[StructLayout(LayoutKind.Sequential, Pack = 0)]
internal struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
public static readonly RECT Empty;
public int Width
{
get { return Math.Abs(right - left); }
}
public int Height
{
get { return bottom - top; }
}
public RECT(int left, int top, int right, int bottom)
{
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
public RECT(RECT rcSrc)
{
left = rcSrc.left;
top = rcSrc.top;
right = rcSrc.right;
bottom = rcSrc.bottom;
}
public bool IsEmpty
{
get
{
return left >= right || top >= bottom;
}
}
public override string ToString()
{
if (this == Empty)
{
return "RECT {Empty}";
}
return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
}
public override bool Equals(object obj)
{
if (!(obj is Rect))
{
return false;
}
return (this == (RECT)obj);
}
public override int GetHashCode()
{
return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
}
public static bool operator ==(RECT rect1, RECT rect2)
{
return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom);
}
public static bool operator !=(RECT rect1, RECT rect2)
{
return !(rect1 == rect2);
}
}
#endregion
}通过调用WindowHelper.RepairWindowBehavior(Window)方法注册Win32消息事件，以后调用this.WindowState = WindowState.Maximized;就可以解决最大化避免覆盖任务栏的问题了。