Question

源自我原始问题的解决方案here

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>

每当我将扩展器控件向右扩展时，我想扩展窗口宽度。当我运行上面引用的xaml并在构建之后展开扩展器控件时，一切都按预期工作，但是一旦我手动调整窗口大小，扩展器控件的内容将扩展到左边的现有区域。

如何更改此行为，以便窗口将其宽度扩展到右侧，内容将最终在该新区域中？

Answer 1

这不是内置于WPF中的内容，因此您必须编写一些自定义代码来处理它。 SizeToContent一直有效，直到最终用户调整窗口大小，然后修复Window大小。

你可以使用这样的东西来完成你想要的东西：

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命名为“firstColumn”，如下所示：

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

如此有效，它像你一样使用SizeToContent。如果您调整窗口大小，则它确保第一列的最小大小保持大小固定并重新切换SizeToContent。

编辑：

注意到你使用了VB.NET标签，所以这是VB.NET版本：

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

窗口在扩展控件时调整大小

1 个答案: