目前有個需求，寫一個類似Chrome標籤頁的界面，標籤頁上有一個+號，點擊增加標籤。+號增加了卻不知道如何處理+號的Click事件：
首先寫Generic.xaml(其中AddItemButton就是我添加的按鈕)：
<SolidColorBrush x:Key="TabItem.Selected.Background" Color="#FFFFFF"/>
<SolidColorBrush x:Key="TabItem.Selected.Border" Color="#ACACAC"/>
<Style TargetType="{x:Type DIYControl:TabControlWithAddButton}">
<Setter Property="Padding" Value="2"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Background" Value="{StaticResource TabItem.Selected.Background}"/>
<Setter Property="BorderBrush" Value="{StaticResource TabItem.Selected.Border}"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabControl}">
<Grid x:Name="templateRoot" ClipToBounds="true" SnapsToDevicePixels="true" KeyboardNavigation.TabNavigation="Local">
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="ColumnDefinition0"/>
<ColumnDefinition x:Name="ColumnDefinition1" Width="0"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition x:Name="RowDefinition0" Height="Auto"/>
<RowDefinition x:Name="RowDefinition1" Height="*"/>
</Grid.RowDefinitions>
<!--容納標頭的東西-->
<StackPanel Grid.Column="0" Orientation="Horizontal" Margin="2,2,2,0" Grid.Row="0" Height="20" HorizontalAlignment="Left">
<StackPanel x:Name="headerPanel" Orientation="Horizontal" Background="Transparent" IsItemsHost="True"/>
<Button x:Name="AddItemButton" Content="+" Width="20"/>
</StackPanel>
<!--<TabPanel x:Name="headerPanel" Background="Transparent" Grid.Column="0" IsItemsHost="true" Margin="2,2,2,0" Grid.Row="0" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1"/>-->
<Border x:Name="contentPanel" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="0" KeyboardNavigation.DirectionalNavigation="Contained" Grid.Row="1" KeyboardNavigation.TabIndex="2" KeyboardNavigation.TabNavigation="Local">
<ContentPresenter x:Name="PART_SelectedContentHost" ContentSource="SelectedContent" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="TabStripPlacement" Value="Bottom">
<Setter Property="Grid.Row" TargetName="headerPanel" Value="1"/>
<Setter Property="Grid.Row" TargetName="contentPanel" Value="0"/>
<Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition1" Value="Auto"/>
<Setter Property="Margin" TargetName="headerPanel" Value="2,0,2,2"/>
</Trigger>
<Trigger Property="TabStripPlacement" Value="Left">
<Setter Property="Grid.Row" TargetName="headerPanel" Value="0"/>
<Setter Property="Grid.Row" TargetName="contentPanel" Value="0"/>
<Setter Property="Grid.Column" TargetName="headerPanel" Value="0"/>
<Setter Property="Grid.Column" TargetName="contentPanel" Value="1"/>
<Setter Property="Width" TargetName="ColumnDefinition0" Value="Auto"/>
<Setter Property="Width" TargetName="ColumnDefinition1" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
<Setter Property="Margin" TargetName="headerPanel" Value="2,2,0,2"/>
</Trigger>
<Trigger Property="TabStripPlacement" Value="Right">
<Setter Property="Grid.Row" TargetName="headerPanel" Value="0"/>
<Setter Property="Grid.Row" TargetName="contentPanel" Value="0"/>
<Setter Property="Grid.Column" TargetName="headerPanel" Value="1"/>
<Setter Property="Grid.Column" TargetName="contentPanel" Value="0"/>
<Setter Property="Width" TargetName="ColumnDefinition0" Value="*"/>
<Setter Property="Width" TargetName="ColumnDefinition1" Value="Auto"/>
<Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
<Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
<Setter Property="Margin" TargetName="headerPanel" Value="0,2,2,2"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
然後寫對應的cs:
思路就是在OnApplyTemplate函數中通過VisualTreeHelper尋找對應的元素，然後進行事件綁定，這裏我綁定的是鼠標的移入事件
public class TabControlWithAddButton : TabControl
{
static TabControlWithAddButton()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(TabControlWithAddButton), new FrameworkPropertyMetadata(typeof(TabControlWithAddButton)));
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
var grid = VisualTreeHelper.GetChild(this, 0);
var stackPanel = VisualTreeHelper.GetChild(grid, 0);
var button = VisualTreeHelper.GetChild(stackPanel, 1) as Button;
if(button != null)
{
button.MouseEnter += AddButtonMouseEntry;
}
}
private void AddButtonMouseEntry(object sender, RoutedEventArgs e)
{
RoutedEventArgs routedEventArgs = new RoutedEventArgs(AddButtonEntryEvent, this);
RaiseEvent(routedEventArgs);
}
public static RoutedEvent AddButtonEntryEvent = EventManager.RegisterRoutedEvent("AddButtonEntry", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(TabControlWithAddButton));
public event RoutedEventHandler AddButtonEntry
{
add
{
this.AddHandler(AddButtonEntryEvent, value);
}
remove
{
this.RemoveHandler(AddButtonEntryEvent, value);
}
}
}