我有一个
WPF应用程序,主窗口的装饰是自定义的,通过WindowStyle =“无”.我绘制自己的标题栏和最小/最大/关闭按钮.不幸的是,当窗口调整大小时,Windows不强制我的MinWidth和MinHeight属性,因此允许将窗口调整到3×3(appx – 足够显示句柄来增长窗口).
我已经不得不拦截窗口事件(sp.0x0024)来修复WindowStyle = none引起的最大化错误(在Windows任务栏中最大化).我不怕拦截更多的事件来实现我所需要的.
有没有人知道如何让我的窗口不能调整大小在我的MinWidth和MinHeight属性下,如果这是可能的？谢谢！！
你需要处理一个Windows消息来做,但这并不复杂.
你必须处理WM_WINDOWPOSCHANGING消息,这样在WPF中需要一些样板代码,你可以看到下面的实际逻辑只是两行代码.
internal enum WM
{
WINDOWPOSCHANGING = 0x0046,}
[StructLayout(LayoutKind.Sequential)]
internal struct WINDOWPOS
{
public IntPtr hwnd;
public IntPtr hwndInsertAfter;
public int x;
public int y;
public int cx;
public int cy;
public int flags;
}
private void Window_SourceInitialized(object sender,EventArgs ea)
{
HwndSource hwndSource = (HwndSource)HwndSource.FromVisual((Window)sender);
hwndSource.AddHook(DragHook);
}
private static IntPtr DragHook(IntPtr hwnd,int msg,IntPtr wParam,IntPtr lParam,ref bool handeled)
{
switch ((WM)msg)
{
case WM.WINDOWPOSCHANGING:
{
WINDOWPOS pos = (WINDOWPOS)Marshal.PtrToStructure(lParam,typeof(WINDOWPOS));
if ((pos.flags & (int)SWP.NOMOVE) != 0)
{
return IntPtr.Zero;
}
Window wnd = (Window)HwndSource.FromHwnd(hwnd).RootVisual;
if (wnd == null)
{
return IntPtr.Zero;
}
bool changedPos = false;
// ***********************
// Here you check the values inside the pos structure
// if you want to override them just change the pos
// structure and set changedPos to true
// ***********************
// this is a simplified version that doesn't work in high-dpi settings
// pos.cx and pos.cy are in "device pixels" and MinWidth and MinHeight
// are in "WPF pixels" (WPF pixels are always 1/96 of an inch - if your
// system is configured correctly).
if(pos.cx < MinWidth) { pos.cx = MinWidth; changedPos = true; }
if(pos.cy < MinHeight) { pos.cy = MinHeight; changedPos = true; }
// ***********************
// end of "logic"
// ***********************
if (!changedPos)
{
return IntPtr.Zero;
}
Marshal.StructureToPtr(pos,lParam,true);
handeled = true;
}
break;
}
return IntPtr.Zero;
}
