展开控件时调整窗口大小

本文关键字：调整 窗口大小 控件 | 更新日期: 2023-09-27 17:50:35

由我原来问题的解推导而来

我现在有以下xaml:

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="300" Width="450" SizeToContent="WidthAndHeight">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="auto" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="auto" />
        </Grid.ColumnDefinitions>
        <TabControl Grid.Column="0" MinWidth="200" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />       
        <Expander Grid.Column="1" Grid.Row="0" ExpandDirection="Right">
            <StackPanel x:Name="cont">
                <Label>testtesttesttesttest</Label>
                <Label>testtesttesttesttest</Label>
                <Label>testtesttesttesttest</Label>
                <Label>testtesttesttesttest</Label>
                <Label>testtesttesttesttest</Label>
                <Label>testtesttesttesttest</Label>
                <Label>testtesttesttesttest</Label>
                <Label>testtesttesttesttest</Label>
            </StackPanel>
        </Expander>
    </Grid>
</Window>

我想扩展窗口宽度每次我展开扩展器控件向右。当我运行上面引用的xaml并在构建后展开扩展器控件时，一切都像预期的那样工作，但是只要我手动调整窗口的大小，扩展器控件的内容就会展开到左边的现有区域。

我如何改变这种行为，使窗口将其宽度扩展到右侧，内容将结束在新的区域?

展开控件时调整窗口大小

这不是WPF内置的东西，所以您必须编写一些自定义代码来处理它。SizeToContent的作用直到最终用户调整窗口大小，然后窗口大小是固定的。

你可以用这样的语句来完成你想要的:

public partial class MainWindow  {
    public MainWindow() {
        InitializeComponent();
    }
    protected override void OnSourceInitialized(EventArgs e) {
        base.OnSourceInitialized(e);
        IntPtr handle = new WindowInteropHelper(this).Handle;
        HwndSource.FromHwnd(handle).AddHook(new HwndSourceHook(this.WindowProc));
    }
    private const int WM_SIZING = 0x0214;
    private const int WM_EXITSIZEMOVE = 0x0232;
    private IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) {
        switch (msg) {
            case WM_SIZING:
                this.firstColumn.ClearValue(ColumnDefinition.MinWidthProperty);
                break;
            case WM_EXITSIZEMOVE:
                this.firstColumn.MinWidth = this.firstColumn.ActualWidth;
                this.SizeToContent = System.Windows.SizeToContent.WidthAndHeight;
                break;
        }
        return IntPtr.Zero;
    }
}

然后你需要给你的第一个ColumnDefinition的名称"firstColumn"，像这样:

<ColumnDefinition x:Name="firstColumn" Width="*" />

有效地使用了SizeToContent。如果你调整窗口的大小，那么它会确保第一列的最小大小保持固定的大小，并重新打开SizeToContent。

编辑:

注意到你使用了VB。. NET标签，所以这里是VB。净版:

Public Partial Class MainWindow
    Public Sub New()
        InitializeComponent()
    End Sub
    Protected Overrides Sub OnSourceInitialized(e As EventArgs)
        MyBase.OnSourceInitialized(e)
        Dim handle As IntPtr = New WindowInteropHelper(Me).Handle
        HwndSource.FromHwnd(handle).AddHook(New HwndSourceHook(AddressOf Me.WindowProc))
    End Sub
    Private Const WM_SIZING As Integer = &H214
    Private Const WM_EXITSIZEMOVE As Integer = &H232
    Private Function WindowProc(hwnd As IntPtr, msg As Integer, wParam As IntPtr, lParam As IntPtr, ByRef handled As Boolean) As IntPtr
        Select Case msg
            Case WM_SIZING
                Me.firstColumn.ClearValue(ColumnDefinition.MinWidthProperty)
                Exit Select
            Case WM_EXITSIZEMOVE
                Me.firstColumn.MinWidth = Me.firstColumn.ActualWidth
                Me.SizeToContent = System.Windows.SizeToContent.WidthAndHeight
                Exit Select
        End Select
        Return IntPtr.Zero
    End Function
End Class
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