WPF拇指拖动和移动WindowState.Maximized

本文关键字:移动 WindowState Maximized 拖动 WPF | 更新日期: 2023-09-27 17:50:05

我有一个自定义窗口,WindowState=WindowState.Maximized的边界和拇指在边界内,似乎当WindowState=WindowState.Maximized我不能拖动和移动自定义窗口到不同的屏幕。

Xaml:

    <Window x:Class="WpfApplication3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" 
        Height="350"
        Width="525"
        WindowStyle="None">
        <Border Name="headerBorder" 
            Width="Auto" 
            Height="50" 
            VerticalAlignment="Top"
            CornerRadius="5,5,0,0" 
            DockPanel.Dock="Top" 
            Background="Red" 
            BorderThickness="1,1,1,1"
            BorderBrush="Yellow">
            <Grid x:Name="PART_Title">
                <Thumb x:Name="headerThumb" 
                    Opacity="0" 
                    Background="{x:Null}" 
                    Foreground="{x:Null}" 
                    DragDelta="headerThumb_DragDelta"/>
            </Grid>
        </Border>
    </Window>
c#:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        WindowState = System.Windows.WindowState.Maximized;
    }
    private void headerThumb_DragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e)
    {
        Left = Left + e.HorizontalChange;
        Top = Top + e.VerticalChange;
    }
}

我也重写了MouseLeftButtonDown方法并在里面使用DragMove(),但没有成功。我也试着订阅拇指的MouseLeftButtonDown,并在那里写DragMove(),但没有成功。

WPF拇指拖动和移动WindowState.Maximized

默认情况下,最大化窗口不能移动,因此LeftTop没有作用。一种选择是注册到Thumb.DragStarted事件并检查窗口是否被最大化。如果是,可以设置WindowState.Normal,然后依次更新LeftTop属性。

在代码中,它看起来像这样:
private void Thumb_OnDragStarted(object sender, DragStartedEventArgs e)
{
    // If the window is not maximized, do nothing
    if (WindowState != WindowState.Maximized)
        return;
    // Set window state to normal
    WindowState = WindowState.Normal;
    // Here you have to determine the initial Left and Top values
    // for the window that has WindowState normal
    // I would use something like the native 'GetCursorPos' (in user32.dll)
    // function to get the absolute mouse point on all screens 
    var point = new Win32Point();
    GetCursorPos(ref point);
    Left = point - certainXValue;
    Top = point - certainYValue;
}

您可以在这里了解更多关于GetCursorPos的信息。

然而,我强烈建议你使用。net 4.5附带的WindowChrome类,Max在评论中也建议了这一点。你只需要使用下面的代码,你就有了你想要的功能:

<Window x:Class="ThumbMaximizedWindow.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350"
        Width="525"
        WindowStyle="None"
        WindowState="Maximized">
    <WindowChrome.WindowChrome>
        <WindowChrome />
    </WindowChrome.WindowChrome>
</Window>