单击任务栏图标 wpf 时在辅助监视器上正确调整大小

Question

我有一个 wpf 应用程序，我使用 WmGetMinMaxInfo 管理最大尺寸：

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以及单击任务栏图标返回以返回最大化窗口应用程序时，我遇到了一个奇怪的问题。

它不占用全屏，它似乎占用了主屏幕分辨率。 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（显然我的辅助屏幕比第一个大）。

您知道问题出在哪里吗？ Windows功能 ？ 有什么解决办法吗？

解决方案： 我已经用 Keithernet 的想法解决了我的问题，即在最小化 windowState 时不重新计算。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);
}

Answer 1

我有一个多年前编写的自定义窗口控件。它仍在积极使用中。无论窗口在哪个显示器上以及单个 DPI 是多少，都可以正确处理窗口。

这是我对WmGetMinMaxInfo 的实现。

我希望这会有所帮助。

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 事件的处理程序中。

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;
    }

    ...
}