适用于Mahapps的全屏行为

Question

如何将动态切换功能从全屏模式添加到窗口模式，反之亦然到Mahapps MetroWindow？

从普通窗口开始

切换到全屏模式后，右上角的按钮（最小化/最大化/关闭）仍然可见（但标题栏应该不可见）。 标题栏的保留空间似乎仍然存在。

从全屏状态开始的另一种方式（没有按钮，除了中间的Hello按钮，没有标题栏=>符合预期）

...但是当切换回正常窗口状态时，标题又回来了，但是左上方的按钮丢失了。

我在代码中在做错什么吗？ 我使用了衍生行为。 切换时执行的有趣的部分是：

    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;
        }
    }

将模拟行为附加到默认Window WPF控件，一切都会按预期工作。

我以这种方式附加行为：

<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>
    ...

编辑：显式设置窗口按钮的状态当我扩展该方法以将状态显式设置为正确的值时，似乎还有另一个奇怪的效果：

    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;
        }
    }

窗口有时会在边界处被切掉，有时看起来是正确的（如顶部的第一张图片）。 我也不知道（当初）从全屏开始时标题栏的空间是否已不再保留（似乎有所不同，不知道为什么）。

Answer 1

当前的1.0版本中有一个小错误。 如果切换UseNoneWindowStyle ，它不会带回按钮和工具栏。 我会尽快修复。

因此，这里有一些解决方法。

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); }
}

希望这可以帮助。