Es gibt andere Antworten auf diese Probleme online. Jedoch berücksichtigt keiner von ihnen, wie die Lösung bei Setups mit mehreren Monitoren funktioniert. Vor allem, wenn der primäre Monitor nicht der am weitesten links im Setup ist.
Ich entwarf diesen Code unter Berücksichtigung von einzelnen und mehreren Monitoren Setups.
Diese Lösung auch nicht in Windows.Forms als Referenz bringen, verwendet es unmanagaged Anrufe.
XAML
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Background="AliceBlue" WindowStyle="None" Height="350" Width="525" SourceInitialized="Window_SourceInitialized">
<Grid>
<Rectangle Name="rctHeader" Height="40" VerticalAlignment="Top" Fill="CadetBlue" PreviewMouseLeftButtonDown="rctHeader_PreviewMouseLeftButtonDown" PreviewMouseLeftButtonUp="rctHeader_PreviewMouseLeftButtonUp" PreviewMouseMove="rctHeader_PreviewMouseMove"/>
</Grid>
</Window>
Code hinter
using System.Runtime.InteropServices;
using System.Windows.Interop;
private bool mRestoreIfMove = false;
public MainWindow()
{
InitializeComponent();
}
void Window_SourceInitialized(object sender, EventArgs e)
{
IntPtr mWindowHandle = (new WindowInteropHelper(this)).Handle;
HwndSource.FromHwnd(mWindowHandle).AddHook(new HwndSourceHook(WindowProc));
}
private static System.IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case 0x0024:
WmGetMinMaxInfo(hwnd, lParam);
break;
}
return IntPtr.Zero;
}
private static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
{
POINT lMousePosition;
GetCursorPos(out lMousePosition);
IntPtr lPrimaryScreen = MonitorFromPoint(new POINT(0, 0), MonitorOptions.MONITOR_DEFAULTTOPRIMARY);
MONITORINFO lPrimaryScreenInfo = new MONITORINFO();
if (GetMonitorInfo(lPrimaryScreen, lPrimaryScreenInfo) == false)
{
return;
}
IntPtr lCurrentScreen = MonitorFromPoint(lMousePosition, MonitorOptions.MONITOR_DEFAULTTONEAREST);
MINMAXINFO lMmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
if (lPrimaryScreen.Equals(lCurrentScreen) == true)
{
lMmi.ptMaxPosition.X = lPrimaryScreenInfo.rcWork.Left;
lMmi.ptMaxPosition.Y = lPrimaryScreenInfo.rcWork.Top;
lMmi.ptMaxSize.X = lPrimaryScreenInfo.rcWork.Right - lPrimaryScreenInfo.rcWork.Left;
lMmi.ptMaxSize.Y = lPrimaryScreenInfo.rcWork.Bottom - lPrimaryScreenInfo.rcWork.Top;
}
else
{
lMmi.ptMaxPosition.X = lPrimaryScreenInfo.rcMonitor.Left;
lMmi.ptMaxPosition.Y = lPrimaryScreenInfo.rcMonitor.Top;
lMmi.ptMaxSize.X = lPrimaryScreenInfo.rcMonitor.Right - lPrimaryScreenInfo.rcMonitor.Left;
lMmi.ptMaxSize.Y = lPrimaryScreenInfo.rcMonitor.Bottom - lPrimaryScreenInfo.rcMonitor.Top;
}
Marshal.StructureToPtr(lMmi, lParam, true);
}
private void SwitchWindowState()
{
switch (WindowState)
{
case WindowState.Normal:
{
WindowState = WindowState.Maximized;
break;
}
case WindowState.Maximized:
{
WindowState = WindowState.Normal;
break;
}
}
}
private void rctHeader_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (e.ClickCount == 2)
{
if ((ResizeMode == ResizeMode.CanResize) || (ResizeMode == ResizeMode.CanResizeWithGrip))
{
SwitchWindowState();
}
return;
}
else if (WindowState == WindowState.Maximized)
{
mRestoreIfMove = true;
return;
}
DragMove();
}
private void rctHeader_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
mRestoreIfMove = false;
}
private void rctHeader_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (mRestoreIfMove)
{
mRestoreIfMove = false;
double percentHorizontal = e.GetPosition(this).X/ActualWidth;
double targetHorizontal = RestoreBounds.Width * percentHorizontal;
double percentVertical = e.GetPosition(this).Y/ActualHeight;
double targetVertical = RestoreBounds.Height * percentVertical;
WindowState = WindowState.Normal;
POINT lMousePosition;
GetCursorPos(out lMousePosition);
Left = lMousePosition.X - targetHorizontal;
Top = lMousePosition.Y - targetVertical;
DragMove();
}
}
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetCursorPos(out POINT lpPoint);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr MonitorFromPoint(POINT pt, MonitorOptions dwFlags);
enum MonitorOptions : uint
{
MONITOR_DEFAULTTONULL = 0x00000000,
MONITOR_DEFAULTTOPRIMARY = 0x00000001,
MONITOR_DEFAULTTONEAREST = 0x00000002
}
[DllImport("user32.dll")]
static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int X;
public int Y;
public POINT(int x, int y)
{
this.X = x;
this.Y = y;
}
}
[StructLayout(LayoutKind.Sequential)]
public struct MINMAXINFO
{
public POINT ptReserved;
public POINT ptMaxSize;
public POINT ptMaxPosition;
public POINT ptMinTrackSize;
public POINT ptMaxTrackSize;
};
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class MONITORINFO
{
public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));
public RECT rcMonitor = new RECT();
public RECT rcWork = new RECT();
public int dwFlags = 0;
}
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int Left, Top, Right, Bottom;
public RECT(int left, int top, int right, int bottom)
{
this.Left = left;
this.Top = top;
this.Right = right;
this.Bottom = bottom;
}
}
+1 für nicht beschissen winforms stopfen –
Nice one verwenden, danke, ich den gleichen Code verwendet mein Fenster richtig zum Laufen zu bringen, Schande Microsoft konnte nicht eine Option hinzufügen, dies automatisch zu tun. +1 – JustAPleb
Dieser Ansatz macht MinWidth & MinHeight nutzlos. Irgendeine Problemumgehung? – SepehrM