WPF 多屏時子視窗的螢幕位置問題

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問題:

在多個顯示屏啟動並執行情況下，如果將主視窗從當前顯示屏移動到另一顯示屏。

設定子視窗單例模式，在當前顯示屏時彈出後，在主視窗移動到另一顯示屏後,再彈出子視窗時，你會發現子視窗跑到原來顯示屏去了。

----這是WPF的鍋

因為已經設定了WindowStartupLocation="CenterOwner"，也加了Owner的情況下，視窗每次彈出，理論上就該和主視窗保持在同一螢幕的。

 

解決:

通過視窗的Activated添加委託，每次視窗喚醒，都重新設定視窗的Location

    subWindow.Left = screen.Bounds.Left + (screen.Bounds.Width - subWindow.Width) / 2;    subWindow.Top = screen.Bounds.Top + (screen.Bounds.Height - subWindow.Height) / 2;

擷取當前主視窗所在的螢幕。

var screen = Screen.FromHandle(new WindowInteropHelper(mainWindow).Handle);

 

詳細：

通過給Window添加一個附加屬性即可

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:

當視窗狀態為最大化時，即WindowState=“Maximized”。是設定不了Location的。那麼就需要去掉Xmal中的WindowState，通過後台去設定全屏

WPF 多屏時子視窗的螢幕位置問題