Question

设计继承的Expander时遇到问题。我的目的是在切换按钮和默认Expander标题中的文本后面有一个进度条。

我有这个XAML代码，它给了我标题中的进度条。这是一种定制风格。

<Style x:Key="CurrentScanExpanderStyle" TargetType="{x:Type local:ProgressExpander}">
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="BorderBrush" Value="Transparent"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:ProgressExpander}">
                    <Border SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="3">
                        <DockPanel>
                            <Grid DockPanel.Dock="Top">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*"/>
                                </Grid.ColumnDefinitions>
                                <ProgressBar Name="ProgressBar"/>
                                <ToggleButton FontFamily="{TemplateBinding FontFamily}" FontSize="{TemplateBinding FontSize}" FontStretch="{TemplateBinding FontStretch}" FontStyle="{TemplateBinding FontStyle}" FontWeight="{TemplateBinding FontWeight}" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" FocusVisualStyle="{StaticResource ExpanderHeaderFocusVisual}" Margin="1" MinHeight="0" MinWidth="0" x:Name="HeaderSite" Style="{StaticResource ExpanderDownHeaderStyle}" IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}" ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}"/>
                            </Grid>
                            <ContentPresenter Focusable="false" Visibility="Collapsed" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" x:Name="ExpandSite" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" DockPanel.Dock="Bottom"/>
                        </DockPanel>
                    </Border>
                    <ControlTemplate.Triggers>
                        <!-- Triggers haven't changed from the default -->
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

这很好但我无法绑定控制进度百分比的自定义依赖项属性。

    public class ProgressExpander : Expander
{
    static ProgressExpander()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(ProgressExpander), new FrameworkPropertyMetadata(typeof(ProgressExpander)));
    }       



    public int Progress
    {
        get { return (int)GetValue(ProgressProperty); }
        set { SetValue(ProgressProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Progress.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty ProgressProperty =
        DependencyProperty.Register("Progress", typeof(int), typeof(ProgressExpander), new UIPropertyMetadata(0));


}

这是窗口内的代码：

            <local:ProgressExpander Grid.Row="1" Header="Current Scan" ExpandDirection="Down" x:Name="currentScanExpander" Style="{DynamicResource CurrentScanExpanderStyle}">
                <Canvas Background="SkyBlue" 
                        Name="currentScanCanvas"
                        Height="{Binding ElementName=currentScanExpander, Path=ActualWidth}"
                        />
            </local:ProgressExpander>

我不确定如何将此依赖项属性进度绑定到样式中ProgressBar中的进度值。

任何帮助都将不胜感激。

Answer 1

在样式中，我们可以使用标准Binding和RelativeSource来设置属性。

<ProgressBar Name="ProgressBar"
             Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Progress}"
             Minimum="0"
             Maximum="100" />

然后，在窗口中我们只需添加Progress =“50”或绑定到其他地方。

您还需要将Button的背景设置为透明，或者更改某种布局方式，以便查看。

将自定义依赖项属性绑定到自定义WPF样式

1 个答案: