标签：tac 最大化 rtu help eof 获取 change void att
问题:
在多个显示屏运行的情况下，如果将主窗口从当前显示屏移动到另一显示屏。
设置子窗口单例模式，在当前显示屏时弹出后，在主窗口移动到另一显示屏后,再弹出子窗口时，你会发现子窗口跑到原来显示屏去了。
----这是WPF的锅
因为已经设置了WindowStartupLocation="CenterOwner"，也加了Owner的情况下，窗口每次弹出，理论上就该和主窗口保持在同一屏幕的。
解决:
通过窗口的Activated添加委托，每次窗口唤醒，都重新设置窗口的Location
subWindow.Left = screen.Bounds.Left + (screen.Bounds.Width - subWindow.Width) / 2; subWindow.Top = screen.Bounds.Top + (screen.Bounds.Height - subWindow.Height) / 2;
获取当前主窗口所在的屏幕。
var screen = Screen.FromHandle(new WindowInteropHelper(mainWindow).Handle);
详细：
通过给Window添加一个附加属性即可
helper:WindowScreenHelper.IsWindowShowInCurrentScreen="True"
public class WindowScreenHelper { public static readonly DependencyProperty IsWindowShowInCurrentScreenProperty = DependencyProperty.RegisterAttached( "IsWindowShowInCurrentScreen", typeof(bool), typeof(WindowScreenHelper), new PropertyMetadata(default(bool), ShowWindowInCurrentScreen)); private static void ShowWindowInCurrentScreen(DependencyObject d, DependencyPropertyChangedEventArgs e) { var window = d as Window; if (window != null) { window.Activated += ShowInCurrentScreenWindow_Activated; } } private static void ShowInCurrentScreenWindow_Activated(object sender, EventArgs e) { var subWindow = sender as Window; if (subWindow == null) return; if (GetIsWindowShowInCurrentScreen(subWindow)) { var mainWindow = App.Current.MainWindow; if (mainWindow == null) return; var screen = Screen.FromHandle(new WindowInteropHelper(mainWindow).Handle); if (subWindow.Tag?.ToString()==WindowState.Maximized.ToString()) { subWindow.Left = screen.Bounds.Left; subWindow.Top = screen.Bounds.Top; subWindow.Width = screen.Bounds.Width; subWindow.Height = screen.Bounds.Height; } else { subWindow.Left = screen.Bounds.Left + (screen.Bounds.Width - subWindow.Width) / 2; subWindow.Top = screen.Bounds.Top + (screen.Bounds.Height - subWindow.Height) / 2; } } } public static void SetIsWindowShowInCurrentScreen(DependencyObject element, bool value) { element.SetValue(IsWindowShowInCurrentScreenProperty, value); } public static bool GetIsWindowShowInCurrentScreen(DependencyObject element) { return (bool)element.GetValue(IsWindowShowInCurrentScreenProperty); } }
PS:
当窗口状态为最大化时，即WindowState=“Maximized”。是设置不了Location的。那么就需要去掉Xmal中的WindowState，通过后台去设置全屏
标签：tac 最大化 rtu help eof 获取 change void att
原文地址：http://www.cnblogs.com/kybs0/p/7420767.html
