[英]Binding custom dependency property to custom WPF style
設計繼承的Expander時遇到問題。 我的目的是在切換按鈕和默認Expander標頭中的文本后面有一個進度條。
我有這個XAML代碼,它給我標題中的進度條。 這是一種定制風格。
<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>
這工作正常,但我無法綁定控制進度百分比的自定義依賴項屬性。
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));
}
這是窗口內的代碼:
<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>
我不確定如何將此依賴項屬性進度綁定到樣式中ProgressBar中的進度值。
任何幫助,將不勝感激。
在樣式中,我們可以使用標准Binding和RelativeSource來設置屬性。
<ProgressBar Name="ProgressBar"
Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Progress}"
Minimum="0"
Maximum="100" />
然后,在窗口中我們只需添加Progress =“50”或綁定到其他地方。
您還需要將Button的背景設置為透明,或者更改某種布局方式,以便查看它。
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