WPF以編程方式綁定選定的TabItem背景屬性
[英]WPF Bind Selected TabItem Background Property Programmatically
問題描述
我想以編程方式將TabItem的Background屬性綁定到自定義屬性。 到目前為止，僅在未選擇TabItem時應用自定義背景：
TabItem與綁定一起以編程方式生成：
Binding binding = new Binding();
binding.Source = this;
binding.Converter = this;
binding.Path = new PropertyPath("HasChanged");
binding.Mode = BindingMode.OneWay;
binding.TargetNullValue = tabItem.Background;
binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(tabItem, TabItem.BackgroundProperty, binding);
我實現了接口IValueConverter
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
GradientStopCollection gradient = new GradientStopCollection();
gradient.Add(new GradientStop(Color.FromRgb(255, 234, 199), 0));
gradient.Add(new GradientStop(Color.FromRgb(255, 233, 194), 0.5));
gradient.Add(new GradientStop(Color.FromRgb(255, 225, 173), 0.5));
gradient.Add(new GradientStop(Color.FromRgb(255, 221, 163), 1));
Brush brush = new LinearGradientBrush(gradient, 90);
return (bool)value ? brush : null;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
如何綁定屬性以影響所選的TabItem ？
2 個解決方案
解決方案1
1 2017-04-06 10:32:54
如mm8在問題注釋中提供的鏈接所述，您將需要覆蓋TabItem的ControlTemplate。 下面是TabControl的實現，左側帶有選項卡，並且TabItem的自定義ControlTemplate。 通過更改邊框的粗細突出顯示選定的項目：
<TabControl TabStripPlacement="Left"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Stretch"
Name="tc"
ItemsSource="{Binding MySource, Mode=OneWay}"
ContentTemplate="{StaticResource templateForTheContent}"
ItemTemplate="{StaticResource templateForTheHeader}">
<TabControl.Resources>
<Style TargetType="TabItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TabItem">
<Border Name="brdPanel"
CornerRadius="3,0,0,3"
BorderBrush="Black"
Background="{TemplateBinding Background}"
Margin="2,2,0,2"
BorderThickness="1,1,0,1">
<ContentPresenter VerticalAlignment="Center"
HorizontalAlignment="Center"
ContentSource="Header"
Margin="10,2" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected"
Value="True">
<Setter TargetName="brdPanel"
Property="BorderThickness"
Value="2,2,0,2" />
<Setter TargetName="brdPanel"
Property="Margin"
Value="1,1,0,1" />
</Trigger>
<Trigger Property="IsSelected"
Value="False">
<Setter TargetName="brdPanel"
Property="BorderThickness"
Value="1,1,0,1" />
<Setter TargetName="brdPanel"
Property="Margin"
Value="2,2,0,2" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TabControl.Resources>
</TabControl>
在下方，將Background的綁定手動設置為LightCoral（此處的綁定源與OP的設置不同，出於演示目的）：
MyItemVM myItem=this.tc.Items[0];
TabItem tabItem = (TabItem)this.tc.ItemContainerGenerator.ContainerFromItem(myItem);
Binding binding = new Binding();
binding.Source = myItem;
binding.Path = new PropertyPath("GroupBackground");
binding.Mode = BindingMode.OneWay;
binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(tabItem, TabItem.BackgroundProperty, binding);
myItem.GroupBackground = Brushes.LightCoral;
MyItemVM myItem=this.tc.Items[1];
tabItem = (TabItem)this.tc.ItemContainerGenerator.ContainerFromItem(myItem);
binding = new Binding();
binding.Source = myItem;
binding.Path = new PropertyPath("GroupBackground");
binding.Mode = BindingMode.OneWay;
binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(tabItem, TabItem.BackgroundProperty, binding);
myItem.GroupBackground = Brushes.LightCoral;
結果看起來像這樣：
注意，這只會更改TabItem標題的背景。
解決方案2
0 已采納 2017-04-07 06:35:44
我最終使用了Arie's Answer的一部分，但是我無法使用他的模板，因為我想要默認的Windows Tab樣式。
我的第一步是刪除所有程序生成的綁定和轉換器。 然后，我使用TabItem的Tag屬性作為布爾值來標記應突出顯示的選項卡。
tabItem.Tag = true;
正如Arie所說，我需要覆蓋XAML文件中的TabItem模板。 我使用此方法來生成默認的TabItem模板。
最后一步是在觸發器中定義一些設置器，以檢查Tag屬性是否設置為true 。 另外，您需要定義Tag應該強制轉換為布爾值而不是字符串。 為此，您需要在Window元素中定義sys ：
<Window ...
xmlns:sys="clr-namespace:System;assembly=mscorlib"
... >
將屬性Tag解釋為布爾值：
<Trigger.Value>
<sys:Boolean>True</sys:Boolean>
</Trigger.Value>
產生的TabItem模板：
<TabControl ... >
<TabControl.Resources>
<Style TargetType="TabItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TabItem">
<Grid SnapsToDevicePixels="True">
<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}">
<ContentPresenter x:Name="Content" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" ContentStringFormat="{TemplateBinding HeaderStringFormat}" ContentSource="Header" HorizontalAlignment="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ItemsControl}}}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{Binding VerticalContentAlignment, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ItemsControl}}}"/>
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" TargetName="Bd">
<Setter.Value>
<LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#FFEAF6FD" Offset="0.15"/>
<GradientStop Color="#FFD9F0FC" Offset="0.5"/>
<GradientStop Color="#FFBEE6FD" Offset="0.5"/>
<GradientStop Color="#FFA7D9F5" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="Tag">
<Trigger.Value>
<sys:Boolean>True</sys:Boolean>
</Trigger.Value>
<Setter Property="Background" TargetName="Bd">
<Setter.Value>
<LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#FFFFEAC7" Offset="0.15"/>
<GradientStop Color="#FFFFE9C2" Offset="0.5"/>
<GradientStop Color="#FFFFE1AD" Offset="0.5"/>
<GradientStop Color="#FFFFDDA3" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Panel.ZIndex" Value="1"/>
<Setter Property="Background" TargetName="Bd" Value="#FFF9F9F9"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="True"/>
<Condition Property="Tag">
<Condition.Value>
<sys:Boolean>True</sys:Boolean>
</Condition.Value>
</Condition>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="#FFFFE5C1"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="False"/>
<Condition Property="IsMouseOver" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="BorderBrush" TargetName="Bd" Value="#FF3C7FB1"/>
</MultiTrigger>
<Trigger Property="TabStripPlacement" Value="Bottom">
<Setter Property="BorderThickness" TargetName="Bd" Value="1,0,1,1"/>
</Trigger>
<Trigger Property="TabStripPlacement" Value="Left">
<Setter Property="BorderThickness" TargetName="Bd" Value="1,1,0,1"/>
</Trigger>
<Trigger Property="TabStripPlacement" Value="Right">
<Setter Property="BorderThickness" TargetName="Bd" Value="0,1,1,1"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="True"/>
<Condition Property="TabStripPlacement" Value="Top"/>
</MultiTrigger.Conditions>
<Setter Property="Margin" Value="-2,-2,-2,-1"/>
<Setter Property="Margin" TargetName="Content" Value="0,0,0,1"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="True"/>
<Condition Property="TabStripPlacement" Value="Bottom"/>
</MultiTrigger.Conditions>
<Setter Property="Margin" Value="-2,-1,-2,-2"/>
<Setter Property="Margin" TargetName="Content" Value="0,1,0,0"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="True"/>
<Condition Property="TabStripPlacement" Value="Left"/>
</MultiTrigger.Conditions>
<Setter Property="Margin" Value="-2,-2,-1,-2"/>
<Setter Property="Margin" TargetName="Content" Value="0,0,1,0"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="True"/>
<Condition Property="TabStripPlacement" Value="Right"/>
</MultiTrigger.Conditions>
<Setter Property="Margin" Value="-1,-2,-2,-2"/>
<Setter Property="Margin" TargetName="Content" Value="1,0,0,0"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Background" TargetName="Bd" Value="#FFF4F4F4"/>
<Setter Property="BorderBrush" TargetName="Bd" Value="#FFC9C7BA"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TabControl.Resources>
<TabItem></TabItem>
</TabControl>
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