自定义控件:如何覆盖默认属性? [英] Custom control: How to override default properties?
问题描述
我创建了一个类似于按钮的自定义控件。
我想覆盖他的默认属性,但是它的工作方式很奇怪。
I've created a custom control similar to a button. I want to override his default properties, but it works strangely.
UserControl Xaml
UserControl Xaml
<UserControl x:Class="project.MyButton"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="50" d:DesignWidth="50">
<Grid>
<Ellipse x:Name="structure" Fill="Black" Stroke="White" StrokeThickness="2"/>
<Label x:Name="content" Content="" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="White" FontFamily="Segoe MDL2 Assets" FontWeight="Bold" FontSize="16"/>
</Grid>
</UserControl>
后面的用户控制代码(C#)
UserControl Code Behind (C#)
/// <summary>A simple custom button.</summary>
public partial class MyButton : UserControl
{
/// <summary>Background color.</summary>
public new Brush Background { get => structure.Fill; set => structure.Fill = value; }
/// <summary>Foreground color.</summary>
public new Brush Foreground { get => content.Foreground; set => content.Foreground = value; }
/// <summary>Stroke color.</summary>
public Brush Stroke { get => structure.Stroke; set => structure.Stroke = value; }
/// <summary>Stroke thickness.</summary>
public double StrokeThickness { get => structure.StrokeThickness; set => structure.StrokeThickness = value; }
/// <summary>Font family.</summary>
public new FontFamily FontFamily { get => content.FontFamily; set => content.FontFamily = value; }
/// <summary>Font weight.</summary>
public new FontWeight FontWeight { get => content.FontWeight; set => content.FontWeight = value; }
/// <summary>Font size.</summary>
public new double FontSize { get => content.FontSize; set => content.FontSize = value; }
/// <summary>Content.</summary>
public new object Content { get => content.Content; set => content.Content = value; }
/// <summary>Inizialize new <see cref="MyButton"/>.</summary>
public MyButton()
{
InitializeComponent();
}
}
结果
但是,当我尝试设置Background属性时,它会为控件的背景着色。而不是椭圆形,当我尝试设置内容时,它会覆盖按钮,等等...
But, when I try to set the Background property it colors the background of the control, and not the ellipse, when I try to set the Content, it overrides the button, etc...
示例: Background = Red
< img src = https://i.stack.imgur.com/PSOcB.png alt =背景红色>
推荐答案
您可以为 UserControl
定义 ControlTemplate
:
<UserControl x:Class="project.MyButton"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfApp4"
mc:Ignorable="d"
d:DesignHeight="50" d:DesignWidth="50">
<UserControl.Template>
<ControlTemplate TargetType="UserControl">
<Grid>
<Ellipse x:Name="structure" Fill="{TemplateBinding Background}" Stroke="White" StrokeThickness="2"/>
<Label x:Name="content" Content="{TemplateBinding Content}" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="White" FontFamily="Segoe MDL2 Assets" FontWeight="Bold" FontSize="16"/>
</Grid>
</ControlTemplate>
</UserControl.Template>
</UserControl>
使用 TemplateBinding
来获取en的属性模板中的元素,可以设置 UserControl
的此属性来更改模板中元素的属性:
Using a TemplateBinding
for a property of en element in the template, you can set this property of the UserControl
to change the property of the element in the template:
<local:Button Background="Red" Content="" />
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