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WPF 使用 ResizeGrip 调整控件大小

转载 作者:行者123 更新时间:2023-12-04 03:23:58 33 4
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我希望用户可以通过拖动右下边框上的 resize-grip 来调整控件的大小。与 ResizeGrip似乎存在实现这一目标的完美控制,但我不知道使用这种控制的计划是什么。它不是从 Thumb 派生的(但是在 msdn 中写到它是它的“实现”),也不支持 Thumb 的路由事件.

ResizeGrip 控件的正确用法是什么?

更新:

我玩过 ResizeGrip我在使用它时遇到了很多奇怪的问题。

最困难的问题是,在右下角也显示 native ResizeGrip (ResizeMode="CanResizeWithGrip") 的窗口中使用 ResizeGrip,该窗口开始对鼠标输入做出非常奇怪的 react 。最后,我拒绝使用它。
作为一个简单的替代方法,您可以使用 Thumb -控制并附加一个适当的模板。

最佳答案

好吧,我昨晚无聊了,用 Thumb 为你写了一个小样本。 .您应该能够复制/粘贴/编译/运行。

但基本上,我创建了一个 UserControl命名 DialogReplica ,只是看起来像一个带有 handle 的对话框的东西,您可以在主窗口中看到它。

<Window x:Class="ResizeGrip.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:ResizeGrip="clr-namespace:ResizeGrip"
Title="MainWindow" Height="350" Width="525">
<Canvas>
<ResizeGrip:DialogReplica Canvas.Top="25" Canvas.Left="100"/>
</Canvas>

这是 UserControl 的 xaml(您最感兴趣的是 Thumb 部分):
<UserControl x:Class="ResizeGrip.DialogReplica"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Border x:Name="Border" HorizontalAlignment="Center" VerticalAlignment="Center" BorderBrush="#FF626161" BorderThickness="2" CornerRadius="3">

<DockPanel x:Name="sizableContent" Background="LightGray" Focusable="False" LastChildFill="True" MinHeight="100" MinWidth="100">

<Border DockPanel.Dock="Top" Background="Gray" Height="30">
<DockPanel>
<Button DockPanel.Dock="Right" Width="16" Height="16"
VerticalAlignment="Center" HorizontalAlignment="Center"
VerticalContentAlignment="Top" HorizontalContentAlignment="Center"
Margin="0,0,4,0" Background="Transparent">
<Button.Content>
<Grid>
<Line X1="1" Y1="1" X2="8" Y2="8" Stroke="White" StrokeThickness="1"/>
<Line X1="1" Y1="8" X2="8" Y2="1" Stroke="White" StrokeThickness="1"/>
</Grid>
</Button.Content>
</Button>
<TextBlock Text="Pretend Dialog" Foreground="White" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</DockPanel>
</Border>

<DockPanel DockPanel.Dock="Bottom" HorizontalAlignment="Stretch">

<Thumb DockPanel.Dock="Right" VerticalAlignment="Bottom" Margin="0,0,1,1"
DragDelta="OnResizeThumbDragDelta"
DragStarted="OnResizeThumbDragStarted"
DragCompleted="OnResizeThumbDragCompleted">
<Thumb.Style>
<Style TargetType="{x:Type Thumb}" BasedOn="{x:Null}">
<Style.Setters>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid x:Name="resizeVisual" DockPanel.Dock="Right" VerticalAlignment="Bottom" >
<Line X1="6" Y1="18" X2="18" Y2="6" Stroke="DarkGray" StrokeThickness="1.5"/>
<!--smallest/right|bottom most -->
<Line X1="10" Y1="18" X2="18" Y2="10" Stroke="DarkGray" StrokeThickness="1.5"/>
<Line X1="14" Y1="18" X2="18" Y2="14" Stroke="DarkGray" StrokeThickness="1.5"/>
<!--longers/left|top most-->
<Grid.Style>
<Style TargetType="{x:Type Grid}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Cursor" Value="SizeNWSE"/>
</Trigger>
</Style.Triggers>
</Style>
</Grid.Style>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>
</Thumb.Style>
</Thumb>

<StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
<Button Margin="12" Width="75" TabIndex="1" Content="Ok"/>
</StackPanel>
</DockPanel>

<StackPanel HorizontalAlignment="Center" Margin="16,16,16,4">
<TextBlock Text="Drag the lower right corner to resize."/>
</StackPanel>
</DockPanel>
</Border>

最后,这是 UserControl 背后的代码
public partial class DialogReplica : UserControl
{
private Cursor _cursor;

public DialogReplica()
{
InitializeComponent();
}

private void OnResizeThumbDragStarted(object sender, DragStartedEventArgs e)
{
_cursor = Cursor;
Cursor = Cursors.SizeNWSE;
}

private void OnResizeThumbDragCompleted(object sender, DragCompletedEventArgs e)
{
Cursor = _cursor;
}

private void OnResizeThumbDragDelta(object sender, DragDeltaEventArgs e)
{
double yAdjust = sizableContent.Height + e.VerticalChange;
double xAdjust = sizableContent.Width + e.HorizontalChange;

//make sure not to resize to negative width or heigth
xAdjust = (sizableContent.ActualWidth + xAdjust) > sizableContent.MinWidth ? xAdjust : sizableContent.MinWidth;
yAdjust = (sizableContent.ActualHeight + yAdjust) > sizableContent.MinHeight ? yAdjust : sizableContent.MinHeight;

sizableContent.Width = xAdjust;
sizableContent.Height = yAdjust;
}
}

关于WPF 使用 ResizeGrip 调整控件大小,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3685566/

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