WPF自定義控件與樣式(6)-ScrollViewer與ListBox自定義樣式一.前言 申明:WPF自定義控件與樣式是一個系列文章,前后是有些關聯(lián)的,但大多是按照由簡到繁的順序逐步發(fā)布的等,若有不明白的地方可以參考本系列前面的文章,文末附有部分文章鏈接。 本文主要內容:
二.ScrollViewer自定義樣式 ScrollViewer在各種列表、集合控件中廣泛使用的基礎組建,先看看效果圖:
如上圖,ScrollViewer簡單來說分兩部分,一個橫向的滾動條,一個垂直滾動條,兩個樣式、模板、功能都基本一樣,他們都是ScrollBar。以垂直滾動條為例,分解一下,分解圖:
上面實現(xiàn)的是一個標準的垂直滑動條ScrollBar組成,實際可用根據需求定制,實現(xiàn)不同效果的滑動效果。以上各部分的樣式代碼:
View Code最后ScrollViewer的樣式如下,其實就是兩個 ScrollBar組成: <!--ScrollViewer樣式--> <Style x:Key="DefaultScrollViewer" TargetType="{x:Type ScrollViewer}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ScrollViewer}"> <Grid x:Name="Grid" Background="{TemplateBinding Background}"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" x:Name="leftColumn" /> <ColumnDefinition Width="Auto" x:Name="rightColumn" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" CanContentScroll="{TemplateBinding CanContentScroll}" CanHorizontallyScroll="False" CanVerticallyScroll="False" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Margin="{TemplateBinding Padding}" Grid.Row="0" Grid.Column="0" /> <!--垂直滾動條 --> <ScrollBar x:Name="PART_VerticalScrollBar" AutomationProperties.AutomationId="VerticalScrollBar" ViewportSize="{TemplateBinding ViewportHeight}" Cursor="Arrow" Grid.Column="1" Maximum="{TemplateBinding ScrollableHeight}" Minimum="0" Grid.Row="0" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"/> <!--水平底部滾動條--> <ScrollBar x:Name="PART_HorizontalScrollBar" AutomationProperties.AutomationId="HorizontalScrollBar" Cursor="Arrow" Grid.Column="0" Maximum="{TemplateBinding ScrollableWidth}" Minimum="0" Orientation="Horizontal" Grid.Row="1" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportWidth}" /> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> 使用很簡單,如果想通用,把上面定義的ScrollViewer設置為默認樣式即可: <Style TargetType="{x:Type ScrollBar}" BasedOn="{StaticResource DefaultScrollBar}"></Style> <Style TargetType="{x:Type ScrollViewer}" BasedOn="{StaticResource DefaultScrollViewer}"></Style> 三.ListBox樣式定義 ListBox是最基礎、常用的集合控件,效果:
ListBox的樣式比較簡單,包括兩部分:
完整代碼: <Style x:Key="DefaultListBoxItem" TargetType="{x:Type ListBoxItem}"> <Setter Property="Foreground" Value="{StaticResource TextForeground}" /> <Setter Property="HorizontalContentAlignment" Value="Stretch" /> <!--<Setter Property="VerticalContentAlignment" Value="Center" />--> <Setter Property="MinHeight" Value="25" /> <Setter Property="Margin" Value="0" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="Padding" Value="3,0,0,0" /> <Setter Property="SnapsToDevicePixels" Value="True" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListBoxItem}"> <Border x:Name="Border" Background="{TemplateBinding Background}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"> <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" /> </Border> <ControlTemplate.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter TargetName="Border" Property="Background" Value="{StaticResource ItemSelectedBackground}" /> <Setter Property="Foreground" Value="{StaticResource ItemSelectedForeground}" /> </Trigger> <Trigger Property="IsMouseOver" Value="True"> <Setter TargetName="Border" Property="Background" Value="{StaticResource ItemMouseOverBackground}" /> <Setter Property="Foreground" Value="{StaticResource ItemMouseOverForeground}" /> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="Border" Property="Opacity" Value="{StaticResource DisableOpacity}" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="DefaultListBox" TargetType="{x:Type ListBox}"> <Setter Property="BorderBrush" Value="{StaticResource ControlBorderBrush}" /> <Setter Property="Background" Value="{StaticResource ItemsContentBackground}" /> <Setter Property="BorderThickness" Value="1" /> <Setter Property="ItemContainerStyle" Value="{StaticResource DefaultListBoxItem}"></Setter> <Setter Property="SnapsToDevicePixels" Value="True" /> <Setter Property="VirtualizingStackPanel.IsVirtualizing" Value="False"></Setter> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListBox}"> <Border Name="Border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <ScrollViewer> <ItemsPresenter /> </ScrollViewer> </Border> <ControlTemplate.Triggers> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="Border" Property="Opacity" Value="{StaticResource DisableOpacity}" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> ListBox默認是支持虛擬化的,當加載大數據時需要開啟虛擬化,或者定義一個虛擬化的樣式: <!--支持虛擬化的ListBox--> <Style x:Key="VirtualListBox" TargetType="{x:Type ListBox}" BasedOn="{StaticResource DefaultListBox}"> <Setter Property="ScrollViewer.CanContentScroll" Value="True" /> <Setter Property="VirtualizingStackPanel.IsVirtualizing" Value="True"></Setter> <Setter Property="VirtualizingStackPanel.VirtualizationMode" Value="Recycling" /> <Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False" /> </Style> 上面演示效果的代碼示例: <ListBox Margin="5" SelectionMode="Multiple" > <ListBoxItem Style="{StaticResource RadioButtonListBoxItem}">男</ListBoxItem> <ListBoxItem Style="{StaticResource RadioButtonListBoxItem}">女</ListBoxItem> <ListBoxItem Style="{StaticResource RadioButtonListBoxItem}">其他</ListBoxItem> <CheckBox>2222333333333333333</CheckBox> <CheckBox>2222333333333333333</CheckBox> <CheckBox>2222333333333333333</CheckBox> <CheckBox>2222333333333333333</CheckBox> <CheckBox>2222333333333333333</CheckBox> <CheckBox>2222333333333333333</CheckBox> <CheckBox>2222333333333333333</CheckBox> <CheckBox>2222333333333333333</CheckBox> <TextBox Width="200"></TextBox> <ListBoxItem IsSelected="True">111</ListBoxItem> </ListBox> <ListBox Margin="5" Grid.Column="1"> <ListBoxItem Style="{StaticResource RadioButtonListBoxItem}">男</ListBoxItem> <ListBoxItem Style="{StaticResource RadioButtonListBoxItem}">女</ListBoxItem> <ListBoxItem Style="{StaticResource RadioButtonListBoxItem}">其他</ListBoxItem> </ListBox> 另外提供一個比較常用的需求,ListBox單選RadioButton效果樣式,如上圖右邊的那個ListBox效果: <Style x:Key="RadioButtonListBoxItem" TargetType="{x:Type ListBoxItem}" BasedOn="{StaticResource DefaultListBoxItem}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListBoxItem}"> <Border x:Name="Border" Background="{TemplateBinding Background}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"> <RadioButton IsChecked="{Binding IsSelected,RelativeSource={RelativeSource TemplatedParent},Mode=TwoWay}"> <RadioButton.Content> <ContentPresenter Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" /> </RadioButton.Content> </RadioButton> </Border> <ControlTemplate.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter TargetName="Border" Property="Background" Value="{StaticResource ItemSelectedBackground}" /> <Setter Property="Foreground" Value="{StaticResource ItemSelectedForeground}" /> </Trigger> <Trigger Property="IsMouseOver" Value="True"> <Setter TargetName="Border" Property="Background" Value="{StaticResource ItemMouseOverBackground}" /> <Setter Property="Foreground" Value="{StaticResource ItemMouseOverForeground}" /> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="Border" Property="Opacity" Value="{StaticResource DisableOpacity}" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>
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