Mahapps 的全屏行为

Question

如何向 Mahapps MetroWindow 添加从全屏到 windowed 模式的动态切换功能，反之亦然？

从普通开始 Window

并且在切换到全屏后右上角 window 按钮 (Minimize/Maximize/Close) 仍然可见（但它们不应像标题栏那样可见）。标题栏保留的space好像还在

相反，最初是从全屏状态（没有按钮，除了中间的 Hello 按钮，没有标题栏 => 正如预期的那样）

...但是当切换回正常状态时 window 标题又回来了，但是左上角的按钮不见了。

我在代码中做错了什么吗？我使用了派生的行为。切换时执行的有趣部分是：

    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 控件一切正常。

我这样附加行为：

<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：明确设置 Window 按钮的状态 当我扩展方法以明确地将状态设置为正确的值时，似乎出现了另一个奇怪的效果：

    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;
        }
    }

window 在边框处被 "sometimes" 切割，有时它看起来是正确的（如顶部的第一张图片）。另外我（还）不知道标题栏的space在开始全屏时是否不再保留（好像有区别，不知道为什么）。

Answer 1

当前的 1.0 版本中有一个小错误。如果您切换 UseNoneWindowStyle，它不会恢复按钮和工具栏。我会尽快解决这个问题。

所以，这里有一个小的解决方法。

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); }
}

希望对您有所帮助。

Mahapps 的全屏行为

FullscreenBehaviour for Mahapps

c#

wpf

fullscreen

mahapps.metro