WPF 动态布局：如何强制平方比例（宽度等于高度）？
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原文地址: http://stackoverflow.com/questions/2981705/
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WPF dynamic layout: how to enforce square proportions (width equals height)?
提问by Gart
I'm learning WPF and can't figure out how to enfore my buttons to take a square shape.
我正在学习 WPF，但不知道如何使我的按钮呈方形。
Here is my XAML Markup:
这是我的 XAML 标记：
<Window x:Class="Example"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="368" Width="333">
<Window.Resources>
<Style x:Key="ToggleStyle" BasedOn="{StaticResource {x:Type ToggleButton}}"
TargetType="{x:Type RadioButton}">
</Style>
</Window.Resources>
<RadioButton Style="{StaticResource ToggleStyle}">
Very very long text
</RadioButton>
</Window>
Specifying explicit values for Widthand Heightattributes seems like a wrong idea - the button should calculate its dimensions based on its contents automagically, but keep its width and height equal. Is this possible?
为Width和Height属性指定显式值似乎是一个错误的想法 - 按钮应该根据其内容自动计算其尺寸，但保持其宽度和高度相等。这可能吗？
回答by Dan Puzey
Try this - it seems to work in Kaxaml:
试试这个 - 它似乎在 Kaxaml 中工作：
<Button
MinWidth="{Binding ActualHeight, RelativeSource={RelativeSource Self}}"
MinHeight="{Binding ActualWidth, RelativeSource={RelativeSource Self}}">
Some content
</Button>
(To test, I put a TextBox inside the button, because that's an easy way to change content size without re-parsing the Xaml.)
（为了测试，我在按钮内放置了一个 TextBox，因为这是一种无需重新解析 Xaml 即可更改内容大小的简单方法。）
Edit:sorry, should probably have specified it as a style to match your example:
编辑：抱歉，可能应该将其指定为与您的示例相匹配的样式：
<Style TargetType="Button" x:Key="SquareButton">
<Setter Property="MinWidth" Value="{Binding ActualHeight, RelativeSource={RelativeSource Self}}" />
<Setter Property="MinHeight" Value="{Binding ActualWidth, RelativeSource={RelativeSource Self}}" />
</Style>
回答by n535
I think you want to bind button's width to its height, like this:
我认为您想将按钮的宽度绑定到其高度，如下所示：
<Button Name="myButton"
Width="{Binding ElementName=myButton, Path=Height}"
Height="100">
Button Text
</Button>
回答by yvan vander sanden
The currently accepted answer cannot grow AND shrink. I think I found a better approach, by defining a custom style with a rectangle (stretched uniformly).
当前接受的答案不能增长和缩小。我想我找到了一个更好的方法，通过使用矩形（均匀拉伸）定义自定义样式。
<Style x:Key="SquareButton" TargetType="Button">
<Setter Property="Foreground" Value="White"/>
<Setter Property="Background" Value="#3a3a3a" />
<Setter Property="BorderBrush" Value="#5a5a5a"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border HorizontalAlignment="Center">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto"/>
</Grid.ColumnDefinitions>
<Rectangle Stretch="Uniform"
Stroke="{TemplateBinding BorderBrush}"
StrokeThickness="4"
Margin="0"
Fill="{TemplateBinding Background}"
Panel.ZIndex="1"
/>
<ContentPresenter Margin="10"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Panel.ZIndex="2" />
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#4a4a4a"/>
</Trigger>
</Style.Triggers>
</Style>
Btw, you can also create a perfect round button this way. Just replace Rectangle with Ellipse.
顺便说一句，您也可以通过这种方式创建一个完美的圆形按钮。只需用椭圆替换矩形。
回答by Ethan Shoe
@Dan Pruzey's answer was good, but did not shrink the square if the window was downsized. What I found to work best was to set the height to auto and the width to that height:
@Dan Pruzey 的回答很好，但如果窗口缩小，则正方形不会缩小。我发现最有效的是将高度设置为自动，将宽度设置为该高度：
<Button Height="Auto" Width="{Binding ActualHeight, RelativeSource={RelativeSource Self}}"/>
This kept the button a square when sizing my window bigger and smaller. Hope this helps someone.
当我的窗口变大和变小时，这使按钮保持方形。希望这可以帮助某人。
