单击任务栏图标wpf时，在辅助监视器上正确调整大小

debugcn 发表于 Dev

堆

我有一个wpf应用程序，并使用WmGetMinMaxInfo管理最大大小：

private static void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam)
{
    MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
    IntPtr monitorContainingApplication = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);

    if (monitorContainingApplication != System.IntPtr.Zero)
    {
        MONITORINFO monitorInfo = new MONITORINFO();
        GetMonitorInfo(monitorContainingApplication, 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);

        mmi.ptMaxTrackSize.x = mmi.ptMaxSize.x;
        mmi.ptMaxTrackSize.y = mmi.ptMaxSize.y;
        
    }

    Marshal.StructureToPtr(mmi, lParam, true);
}

我的窗口设置为：

WindowStyle="None"
ResizeMode="CanResizeWithGrip" 
AllowsTransparency="True"

当我在最大化状态下最小化应用程序时，以及在任务栏图标上单击返回以返回到最大化窗口应用程序时，我遇到了一个奇怪的问题。

它不采用全屏显示，而是采用主屏幕分辨率。当我在主屏幕和辅助屏幕之间没有相同的分辨率时，我遇到了这种情况（很明显，我的辅助屏幕比第一个屏幕大）。

您有什么想法吗？Windows功能？有没有解决的办法？

解决方案：我已经解决了我的问题，即在最小化windowState时不重新计算Kethernet的想法。谢谢！

private static void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam)
{
    MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
    IntPtr monitorContainingApplication = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);

    if (monitorContainingApplication != System.IntPtr.Zero)
    {
        MONITORINFO monitorInfo = new MONITORINFO();
        GetMonitorInfo(monitorContainingApplication, monitorInfo);
        RECT rcWorkArea = monitorInfo.rcWork;
        RECT rcMonitorArea = monitorInfo.rcMonitor;

        if (Application.Current.MainWindow.WindowState != WindowState.Minimized)
        {
            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);

            mmi.ptMaxTrackSize.x = mmi.ptMaxSize.x;
            mmi.ptMaxTrackSize.y = mmi.ptMaxSize.y;
            lastGoodMaxTrackSize = mmi.ptMaxTrackSize;
            lastGoodMaxPosition = mmi.ptMaxPosition;
            lastGoodMaxSize = mmi.ptMaxSize;
        }
        else
        {
            mmi.ptMaxPosition = lastGoodMaxPosition;
            mmi.ptMaxSize = lastGoodMaxSize;
            mmi.ptMaxTrackSize = lastGoodMaxTrackSize;
        }
        mmi = AdjustWorkingAreaForAutoHide(monitorContainingApplication, mmi);
    }

    Marshal.StructureToPtr(mmi, lParam, true);
}

凯瑟网

我有一个多年以前编写的自定义窗口控件。它仍在积极使用。无论Windows处于哪个显示以及各个DPI是什么，都可以正确处理Windows。

这是我对的实现WmGetMinMaxInfo。

我希望这是有帮助的。

private void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam)
{
    var mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
    var hMonitor = Win32.MonitorFromWindow(hwnd, 1);
    
    if (hMonitor != IntPtr.Zero)
    {
        var monitorInfo = new Win32.MONITORINFO();
        
        Win32.GetMonitorInfo(hMonitor, monitorInfo);
        
        var rcWorkArea = monitorInfo.rcWork;
        var 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);
        
        mmi.ptMinTrackSize.x = (int)(minWidth * hidpiX);
        mmi.ptMinTrackSize.y = (int)(minHeight * hidpiY);

        var window = (Window)HwndSource.FromHwnd(hwnd)?.RootVisual;

        if (window != null)
        {
            if (window.WindowState != WindowState.Minimized)
            {
                mmi.ptMaxTrackSize.x = Win32.GetSystemMetrics(Win32.SystemMetric.SM_CXVIRTUALSCREEN);
                mmi.ptMaxTrackSize.y = Win32.GetSystemMetrics(Win32.SystemMetric.SM_CYVIRTUALSCREEN);
                
                lastGoodMaxTrackSize = mmi.ptMaxTrackSize;
            }
            else if (lastGoodMaxTrackSize.x > 0 && lastGoodMaxTrackSize.y > 0)
            {
                mmi.ptMaxTrackSize = lastGoodMaxTrackSize;
            }
        }
    
        mmi = AdjustWorkingAreaForAutoHide(hMonitor, mmi);
    }

    Marshal.StructureToPtr(mmi, lParam, true);
}

对于hidpiX和hidpiY，我将它们放在OnSourceInitialized事件处理程序中。

private void OnSourceInitialized(object sender, EventArgs e)
{
    ...

    var source = PresentationSource.FromVisual((Visual)sender);

    if (source == null) return;

    // Get the X and Y HiDPI factors from the media matrix
    if (source.CompositionTarget != null)
    {
        hidpiX = source.CompositionTarget.TransformToDevice.M11;
        hidpiY = source.CompositionTarget.TransformToDevice.M22;
    }

    ...
}

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