適用於Mahapps的全屏行為

Question

如何將動態切換功能從全屏模式添加到窗口模式，反之亦然到Mahapps MetroWindow？

從普通窗口開始

切換到全屏模式后，右上角的按鈕（最小化/最大化/關閉）仍然可見（但標題欄應該不可見）。 標題欄的保留空間似乎仍然存在。

從全屏狀態開始的另一種方式（沒有按鈕，除了中間的Hello按鈕，沒有標題欄=>符合預期）

...但是當切換回正常窗口狀態時，標題又回來了，但是左上方的按鈕丟失了。

我在代碼中在做錯什么嗎？ 我使用了衍生行為。 切換時執行的有趣的部分是：

    private static void OnIsFullscreenChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        var window = (MetroWindow)sender;

        var oldValue = (bool)e.OldValue;
        var newValue = (bool)e.NewValue;

        if (newValue == oldValue || window == null)
        {
            return;
        }

        if (newValue)
        {
            window.Tag = window.WindowState;

            window.Topmost = true;

            window.UseNoneWindowStyle = true;
            window.IgnoreTaskbarOnMaximize = true;
            window.ShowTitleBar = false;

            window.WindowStyle = WindowStyle.None;
            window.WindowState = WindowState.Maximized;
        }
        else
        {
            window.Topmost = false;

            window.UseNoneWindowStyle = false;
            window.IgnoreTaskbarOnMaximize = false;
            window.ShowTitleBar = true;

            window.WindowStyle = WindowStyle.SingleBorderWindow;
            window.WindowState = (WindowState)window.Tag;
        }
    }

將模擬行為附加到默認Window WPF控件，一切都會按預期工作。

我以這種方式附加行為：

<controls:MetroWindow ... local:FullscreenBehavior.IsFullscreen="{Binding Fullscreen}">
<!-- code above sets initial state depending on ViewModel value -->
<!-- code below fires mode switching when a defined key is pressed => executes  OnIsFullscreenChanged method -->
    <i:Interaction.Behaviors>
        <behaviours:BorderlessWindowBehavior />
        <behaviours:WindowsSettingBehaviour />
        <behaviours:GlowWindowBehavior />
        <modern:FullscreenBehavior FullscreenKey="{Binding FullscreenKey}" />       
    </i:Interaction.Behaviors>
    ...

編輯：顯式設置窗口按鈕的狀態當我擴展該方法以將狀態顯式設置為正確的值時，似乎還有另一個奇怪的效果：

    private static void OnIsFullscreenChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        var window = (MetroWindow)sender;

        var oldValue = (bool)e.OldValue;
        var newValue = (bool)e.NewValue;

        if (newValue == oldValue || window == null)
        {
            return;
        }

        if (newValue)
        {
            window.Tag = window.WindowState;

            window.Topmost = true;

            window.UseNoneWindowStyle = true;
            window.IgnoreTaskbarOnMaximize = true;
            window.ShowTitleBar = false;
            window.ShowCloseButton = false;
            window.ShowMaxRestoreButton = false;
            window.ShowMinButton = false;

            window.WindowStyle = WindowStyle.None;
            window.WindowState = WindowState.Maximized;
        }
        else
        {
            window.Topmost = false;

            window.UseNoneWindowStyle = false;
            window.IgnoreTaskbarOnMaximize = false;
            window.ShowTitleBar = true;
            window.ShowCloseButton = true;
            window.ShowMaxRestoreButton = true;
            window.ShowMinButton = true;

            window.ShowCloseButton = true;
            window.ShowMaxRestoreButton = true;
            window.WindowStyle = WindowStyle.SingleBorderWindow;
            window.WindowState = (WindowState)window.Tag;
        }
    }

窗口有時會在邊界處被切掉，有時看起來是正確的（如頂部的第一張圖片）。 我也不知道（當初）從全屏開始時標題欄的空間是否已不再保留（似乎有所不同，不知道為什么）。

Answer 1

當前的1.0版本中有一個小錯誤。 如果切換UseNoneWindowStyle ，它不會帶回按鈕和工具欄。 我會盡快修復。

因此，這里有一些解決方法。

public static readonly DependencyProperty ToggleFullScreenProperty =
    DependencyProperty.Register("ToggleFullScreen",
                                typeof(bool),
                                typeof(MainWindow),
                                new PropertyMetadata(default(bool), ToggleFullScreenPropertyChangedCallback));

private static void ToggleFullScreenPropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
    var metroWindow = (MetroWindow)dependencyObject;
    if (e.OldValue != e.NewValue)
    {
        var fullScreen = (bool)e.NewValue;
        if (fullScreen)
        {
            metroWindow.UseNoneWindowStyle = true;
            metroWindow.IgnoreTaskbarOnMaximize = true;
            metroWindow.ShowMinButton = false;
            metroWindow.ShowMaxRestoreButton = false;
            metroWindow.ShowCloseButton = false;
            metroWindow.WindowState = WindowState.Maximized;
        }
        else
        {
            metroWindow.UseNoneWindowStyle = false;
            metroWindow.ShowTitleBar = true; // <-- this must be set to true
            metroWindow.IgnoreTaskbarOnMaximize = false;
            metroWindow.ShowMinButton = true;
            metroWindow.ShowMaxRestoreButton = true;
            metroWindow.ShowCloseButton = true;
            metroWindow.WindowState = WindowState.Normal;
        }
    }
}

public bool ToggleFullScreen
{
    get { return (bool)GetValue(ToggleFullScreenProperty); }
    set { SetValue(ToggleFullScreenProperty, value); }
}

希望這可以幫助。