WPF窗口位于顶部/左侧放置任务栏的最大化状态
我正在研究WPF应用程序,我遇到的问题是,当WindowStyle=None
和WindowState = WindowState.Maximized
,应用程序位于顶部或左侧放置任务栏。
任务栏放置在底部或右侧时,一切正常。
我知道窗口的Left
和Top
属性,但它们在Maximized
状态下被忽略。
还有Microsoft.Windows.Shell.WindowСhrome
,它提供了拖动,双击以最大化和恢复,捕捉和取消隐藏的function。 (需要添加为dll参考)
我希望实现我的应用程序不隐藏或进入任务栏,并正确使用WindowСhrome
提供的行为。
MainWindow.xaml
MainWindow.xaml.cs
using System.Windows; namespace WpfAppTestFullScreen { /// /// Interaction logic for MainWindow.xaml /// public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); MaxHeight = SystemParameters.MaximizedPrimaryScreenHeight; MaxWidth = SystemParameters.MaximizedPrimaryScreenWidth; } private void FullScreenButton_Click(object sender, RoutedEventArgs e) { if (WindowState == WindowState.Maximized) { WindowState = WindowState.Normal; } else { WindowState = WindowState.Maximized; } } private void buttonMax_Click(object sender, RoutedEventArgs e) { if (WindowState == WindowState.Maximized) { WindowState = WindowState.Normal; } else { WindowState = WindowState.Maximized; } } private void buttonMin_Click(object sender, RoutedEventArgs e) { WindowState = (WindowState == WindowState.Minimized) ? WindowState.Normal : WindowState.Minimized; } private void buttonExit_Click(object sender, RoutedEventArgs e) { } } }
这是问题的截图:
更好的方法是使用User32.dll
的一些本机方法
(摘自此博文 )
这个怎么运作:
- 为WindowMessages(
WindowProc
)添加一个钩子,以便您可以从系统接收窗口消息。
每个窗口都有一个关联的窗口过程 – 一个处理发送或发布到类的所有窗口的所有消息的函数。 窗口外观和行为的所有方面都取决于窗口过程对这些消息的响应。
- 您将收到信号通知(
0x24
=WM_GETMINMAXINFO
)窗口大小即将更改
当窗口的大小或位置即将发生变化时发送到窗口。 应用程序可以使用此消息覆盖窗口的默认最大大小和位置,或其默认的最小或最大跟踪大小。
- 您将获得窗口当前所在的监视器(
MonitorFromWindow
)并更新边界。
应用程序可以通过设置此结构的成员来覆盖默认值。
- 系统将负责其余部分。
因此,无论窗口如何resize(拖动到屏幕顶部,窗口键+箭头,最大化按钮等),它将保持在您的工作区域的边界内。
原生方法和类型:
(只需将此类复制到您的项目中)
public static class Native { [DllImport("user32")] internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi); [DllImport("user32")] internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags); public static void WmGetMinMaxInfo(IntPtr hwnd, IntPtr lParam, int minWidth, int minHeight) { MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO)); // Adjust the maximized size and position to fit the work area of the correct monitor int MONITOR_DEFAULTTONEAREST = 0x00000002; IntPtr monitor = Native.MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST); if (monitor != IntPtr.Zero) { Native.MONITORINFO monitorInfo = new Native.MONITORINFO(); Native.GetMonitorInfo(monitor, monitorInfo); Native.RECT rcWorkArea = monitorInfo.rcWork; Native.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.ptMinTrackSize.x = minWidth; mmi.ptMinTrackSize.y = minHeight; } Marshal.StructureToPtr(mmi, lParam, true); } /// /// POINT aka POINTAPI /// [StructLayout(LayoutKind.Sequential)] public struct POINT { /// /// x coordinate of point. /// public int x; /// /// y coordinate of point. /// public int y; /// /// Construct a point of coordinates (x,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; } /// Win32 [StructLayout(LayoutKind.Sequential, Pack = 0)] public struct RECT { /// Win32 public int left; /// Win32 public int top; /// Win32 public int right; /// Win32 public int bottom; /// Win32 public static readonly RECT Empty = new RECT(); /// Win32 public int Width { get { return Math.Abs(right - left); } // Abs needed for BIDI OS } /// Win32 public int Height { get { return bottom - top; } } /// Win32 public RECT(int left, int top, int right, int bottom) { this.left = left; this.top = top; this.right = right; this.bottom = bottom; } /// Win32 public RECT(RECT rcSrc) { this.left = rcSrc.left; this.top = rcSrc.top; this.right = rcSrc.right; this.bottom = rcSrc.bottom; } /// Win32 public bool IsEmpty { get { // BUGBUG : On Bidi OS (hebrew arabic) left > right return left >= right || top >= bottom; } } /// Return a user friendly representation of this struct public override string ToString() { if (this == RECT.Empty) { return "RECT {Empty}"; } return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }"; } /// Determine if 2 RECT are equal (deep compare) public override bool Equals(object obj) { if (!(obj is Rect)) { return false; } return (this == (RECT)obj); } /// Return the HashCode for this struct (not garanteed to be unique) public override int GetHashCode() { return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode(); } /// Determine if 2 RECT are equal (deep compare) 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); } /// Determine if 2 RECT are different(deep compare) public static bool operator !=(RECT rect1, RECT rect2) { return !(rect1 == rect2); } } }
你的窗口:
public partial class MainWindow : Window { public MainWindow() { SourceInitialized += Window_SourceInitialized; InitializeComponent(); } void Window_SourceInitialized(object sender, EventArgs e) { IntPtr handle = new WindowInteropHelper(this).Handle; HwndSource.FromHwnd(handle)?.AddHook(WindowProc); } private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { case 0x0024: Native.WmGetMinMaxInfo(hwnd, lParam, (int)MinWidth, (int)MinHeight); handled = true; break; } return (IntPtr)0; } private void FullScreenButton_Click(object sender, RoutedEventArgs e) { WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized; } private void buttonMax_Click(object sender, RoutedEventArgs e) { WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized; } private void buttonMin_Click(object sender, RoutedEventArgs e) { WindowState = WindowState == WindowState.Minimized ? WindowState.Normal : WindowState.Minimized; } private void buttonExit_Click(object sender, RoutedEventArgs e) { Close(); } }