如何创建 WPF 圆角容器？
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How do I create a WPF Rounded Corner container?
提问by FarrEver
We are creating an XBAP application that we need to have rounded corners in various locations in a single page and we would like to have a WPF Rounded Corner container to place a bunch of other elements within. Does anyone have some suggestions or sample code on how we can best accomplish this? Either with styles on a or with creating a custom control?
我们正在创建一个 XBAP 应用程序，我们需要在单个页面的各个位置都有圆角，我们希望有一个 WPF 圆角容器来放置一堆其他元素。有没有人对我们如何最好地实现这一目标有一些建议或示例代码？是使用样式还是创建自定义控件？
回答by kobusb
You don't need a custom control, just put your container in a border element:
您不需要自定义控件，只需将容器放在边框元素中：
<Border BorderBrush="#FF000000" BorderThickness="1" CornerRadius="8">
<Grid/>
</Border>
You can replace the <Grid/>with any of the layout containers...
您可以<Grid/>用任何布局容器替换...
回答by cplotts
I know that this isn't an answer to the initial question ... but you often want to clip the inner content of that rounded corner border you just created.
我知道这不是最初问题的答案……但是您经常想剪辑刚刚创建的圆角边框的内部内容。
Chris Cavanagh has come up with an excellent wayto do just this.
Chris Cavanagh 想出了一个很好的方法来做到这一点。
I have tried a couple different approaches to this ... and I think this one rocks.
我尝试了几种不同的方法来解决这个问题……我认为这个方法很摇滚。
Here is the xaml below:
这是下面的xaml：
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Background="Black"
>
<!-- Rounded yellow border -->
<Border
HorizontalAlignment="Center"
VerticalAlignment="Center"
BorderBrush="Yellow"
BorderThickness="3"
CornerRadius="10"
Padding="2"
>
<Grid>
<!-- Rounded mask (stretches to fill Grid) -->
<Border
Name="mask"
Background="White"
CornerRadius="7"
/>
<!-- Main content container -->
<StackPanel>
<!-- Use a VisualBrush of 'mask' as the opacity mask -->
<StackPanel.OpacityMask>
<VisualBrush Visual="{Binding ElementName=mask}"/>
</StackPanel.OpacityMask>
<!-- Any content -->
<Image Source="http://chriscavanagh.files.wordpress.com/2006/12/chriss-blog-banner.jpg"/>
<Rectangle
Height="50"
Fill="Red"/>
<Rectangle
Height="50"
Fill="White"/>
<Rectangle
Height="50"
Fill="Blue"/>
</StackPanel>
</Grid>
</Border>
</Page>
回答by cplotts
I just had to do this myself, so I thought I would post another answer here.
我只需要自己做这个，所以我想我会在这里发布另一个答案。
Here is another way to create a rounded corner border and clip its inner content. This is the straightforward way by using the Clip property. It's nice if you want to avoid a VisualBrush.
这是创建圆角边框并剪辑其内部内容的另一种方法。这是使用 Clip 属性的直接方法。如果您想避免使用 VisualBrush，这很好。
The xaml:
xml：
<Border
Width="200"
Height="25"
CornerRadius="11"
Background="#FF919194"
>
<Border.Clip>
<RectangleGeometry
RadiusX="{Binding CornerRadius.TopLeft, RelativeSource={RelativeSource AncestorType={x:Type Border}}}"
RadiusY="{Binding RadiusX, RelativeSource={RelativeSource Self}}"
>
<RectangleGeometry.Rect>
<MultiBinding
Converter="{StaticResource widthAndHeightToRectConverter}"
>
<Binding
Path="ActualWidth"
RelativeSource="{RelativeSource AncestorType={x:Type Border}}"
/>
<Binding
Path="ActualHeight"
RelativeSource="{RelativeSource AncestorType={x:Type Border}}"
/>
</MultiBinding>
</RectangleGeometry.Rect>
</RectangleGeometry>
</Border.Clip>
<Rectangle
Width="100"
Height="100"
Fill="Blue"
HorizontalAlignment="Left"
VerticalAlignment="Center"
/>
</Border>
The code for the converter:
转换器的代码：
public class WidthAndHeightToRectConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
double width = (double)values[0];
double height = (double)values[1];
return new Rect(0, 0, width, height);
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
回答by BSalita
VB.Net code based implementation of kobusb's Border control solution. I used it to populate a ListBox of Button controls. The Button controls are created from MEF extensions. Each extension uses MEF's ExportMetaData attribute for a Description of the extension. The extensions are VisiFire charting objects. The user pushes a button, selected from the list of buttons, to execute the desired chart.
基于 VB.Net 代码的 kobusb 边境控制解决方案的实现。我用它来填充 Button 控件的 ListBox。Button 控件是从 MEF 扩展创建的。每个扩展使用 MEF 的 ExportMetaData 属性作为扩展的描述。扩展是 VisiFire 图表对象。用户按下从按钮列表中选择的按钮来执行所需的图表。
' Create a ListBox of Buttons, one button for each MEF charting component.
For Each c As Lazy(Of ICharts, IDictionary(Of String, Object)) In ext.ChartDescriptions
Dim brdr As New Border
brdr.BorderBrush = Brushes.Black
brdr.BorderThickness = New Thickness(2, 2, 2, 2)
brdr.CornerRadius = New CornerRadius(8, 8, 8, 8)
Dim btn As New Button
AddHandler btn.Click, AddressOf GenericButtonClick
brdr.Child = btn
brdr.Background = btn.Background
btn.Margin = brdr.BorderThickness
btn.Width = ChartsLBx.ActualWidth - 22
btn.BorderThickness = New Thickness(0, 0, 0, 0)
btn.Height = 22
btn.Content = c.Metadata("Description")
btn.Tag = c
btn.ToolTip = "Push button to see " & c.Metadata("Description").ToString & " chart"
Dim lbi As New ListBoxItem
lbi.Content = brdr
ChartsLBx.Items.Add(lbi)
Next
Public Event Click As RoutedEventHandler
Private Sub GenericButtonClick(sender As Object, e As RoutedEventArgs)
Dim btn As Button = DirectCast(sender, Button)
Dim c As Lazy(Of ICharts, IDictionary(Of String, Object)) = DirectCast(btn.Tag, Lazy(Of ICharts, IDictionary(Of String, Object)))
Dim w As Window = DirectCast(c.Value, Window)
Dim cc As ICharts = DirectCast(c.Value, ICharts)
c.Value.CreateChart()
w.Show()
End Sub
<System.ComponentModel.Composition.Export(GetType(ICharts))> _
<System.ComponentModel.Composition.ExportMetadata("Description", "Data vs. Time")> _
Public Class DataTimeChart
Implements ICharts
Public Sub CreateChart() Implements ICharts.CreateChart
End Sub
End Class
Public Interface ICharts
Sub CreateChart()
End Interface
Public Class Extensibility
Public Sub New()
Dim catalog As New AggregateCatalog()
catalog.Catalogs.Add(New AssemblyCatalog(GetType(Extensibility).Assembly))
'Create the CompositionContainer with the parts in the catalog
ChartContainer = New CompositionContainer(catalog)
Try
ChartContainer.ComposeParts(Me)
Catch ex As Exception
Console.WriteLine(ex.ToString)
End Try
End Sub
' must use Lazy otherwise instantiation of Window will hold open app. Otherwise must specify Shutdown Mode of "Shutdown on Main Window".
<ImportMany()> _
Public Property ChartDescriptions As IEnumerable(Of Lazy(Of ICharts, IDictionary(Of String, Object)))
End Class
回答by Daniel
If you're trying to put a button in a rounded-rectangle border, you should check out msdn's example. I found this by googling for images of the problem (instead of text). Their bulky outer rectangle is (thankfully) easy to remove.
如果您尝试将按钮放在圆角矩形边框中，则应查看msdn 的示例。我通过谷歌搜索问题的图像（而不是文本）发现了这一点。它们庞大的外部矩形（谢天谢地）很容易移除。
Note that you will have to redefine the button's behavior (since you've changed the ControlTemplate). That is, you will need to define the button's behavior when clicked using a Trigger tag (Property="IsPressed" Value="true") in the ControlTemplate.Triggers tag. Hope this saves someone else the time I lost :)
请注意，您必须重新定义按钮的行为（因为您已经更改了 ControlTemplate）。也就是说，您需要使用 ControlTemplate.Triggers 标记中的 Trigger 标记（Property="IsPressed" Value="true"）定义单击时按钮的行为。希望这可以节省其他人我失去的时间:)
