【转】WPF自定义控件与样式(9)-树控件TreeView与菜单Menu-ContextMenu

其他 2018-12-19 12:30:32 阅读次数: 0

一．前言

　　申明：WPF自定义控件与样式是一个系列文章，前后是有些关联的，但大多是按照由简到繁的顺序逐步发布的等。

　　本文主要内容：

  • 菜单Menu的自定义样式；
  • 右键菜单ContextMenu的自定义样式；
  • 树控件TreeView的自定义样式，及右键菜单实现。

二．菜单Menu的自定义样式

　　自定义菜单样式的效果图：

　　Menu和ContextMenu样式本身很简单，他们最主要的部分就是MenuItem，MenuItem中包含的内容比较多，如图标、选中状态、二级菜单、二级菜单的指针、快捷键等。 使用了字体图标定义菜单项MenuItem样式代码：  

<!--菜单项MenuItem样式FIconMenuItem-->
    <Style x:Key="FIconMenuItem" TargetType="{x:Type MenuItem}">
        <Setter Property="BorderBrush" Value="{StaticResource MenuBorderBrush}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Background" Value="{StaticResource MenuBackground}"/>
        <Setter Property="Foreground" Value="{StaticResource MenuForeground}"/>
        <Setter Property="FontSize" Value="{StaticResource FontSize}"/>
        <Setter Property="Height" Value="28"/>
        <Setter Property="Width" Value="Auto"/>
        <Setter Property="Margin" Value="1"/>
        <Setter Property="local:ControlAttachProperty.FIconSize" Value="22"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type MenuItem}">
                    <!--Item-->
                    <Border  x:Name="border" Background="Transparent" Height="{TemplateBinding Height}" Opacity="1">
                        <Grid  VerticalAlignment="Center" Margin="{TemplateBinding Margin}">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition x:Name="icon_col" MaxWidth="35" SharedSizeGroup="MenuItemIconColumnGroup"/>
                                <ColumnDefinition Width="Auto" SharedSizeGroup="MenuTextColumnGroup"/>
                                <ColumnDefinition Width="Auto" SharedSizeGroup="MenuItemIGTColumnGroup"/>
                                <ColumnDefinition Width="16" x:Name="arrow_col" SharedSizeGroup="MenumItemArrow"/>
                            </Grid.ColumnDefinitions>
                            <!--icon-->
                            <TextBlock x:Name="PART_Icon" Text="{TemplateBinding Icon}" Foreground="{TemplateBinding Foreground}" Margin="5,1,1,1"
                                       FontSize="{TemplateBinding local:ControlAttachProperty.FIconSize}" Style="{StaticResource FIcon}"/>
                            <!--Header-->
                            <ContentPresenter Grid.Column="1" x:Name="txtHeader" Margin="3,1,5,1" MinWidth="90"
                                          RecognizesAccessKey="True" VerticalAlignment="Center" ContentSource="Header"/>
                            <!--快捷键 InputGestureText 暂不支持你了 -->
                            <TextBlock Grid.Column="2" Margin="3,1,3,1" x:Name="IGTHost" Text="{TemplateBinding InputGestureText}" 
                                       FontSize="{TemplateBinding FontSize}"
                                       VerticalAlignment="Center" Visibility="Visible" Foreground="{TemplateBinding Foreground}" />
                            <!--右指针-->
                            <TextBlock x:Name="PART_Arrow" Grid.Column="3" Text="&#xe605;" Foreground="{TemplateBinding Foreground}" 
                                       FontSize="14" Style="{StaticResource FIcon}"/>
                            <!--淡出子集菜单容器-->
                            <Popup x:Name="SubMenuPopup" AllowsTransparency="true" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" 
                                        Placement="Bottom"  Focusable="false" VerticalOffset="0"
                                   PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}">
                                <Border Background="{TemplateBinding Background}"  CornerRadius="0" Margin="5" Effect="{StaticResource DefaultDropShadow}"
                                                BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                                    <Grid x:Name="SubMenu" Grid.IsSharedSizeScope="True">
                                        <StackPanel Margin="0" IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Cycle"/>
                                    </Grid>
                                </Border>
                            </Popup>
                        </Grid>
                    </Border>
                    <!--触发器-->
                    <ControlTemplate.Triggers>
                        <!--TopLevelHeader:第一级菜单（有子菜单）-->
                        <Trigger Property="Role" Value="TopLevelHeader">
                            <Setter Property="Visibility" Value="Collapsed" TargetName="PART_Arrow"/>
                            <Setter Property="Visibility" Value="Collapsed" TargetName="IGTHost"/>
                            <Setter Property="Margin" Value="5,1,1,1" TargetName="PART_Icon"/>
                            <Setter Property="Margin" Value="1,1,6,1" TargetName="txtHeader"/>
                            <Setter Property="MinWidth" Value="10" TargetName="txtHeader"/>
                            <Setter Property="Width" Value="0" TargetName="arrow_col"/>
                        </Trigger>
                        <!--TopLevelItem 第一级菜单（无子级）-->
                        <Trigger Property="Role" Value="TopLevelItem">
                            <Setter Property="Visibility" Value="Collapsed" TargetName="PART_Arrow"/>
                            <Setter Property="Visibility" Value="Collapsed" TargetName="IGTHost"/>
                            <Setter Property="Margin" Value="5,1,1,1" TargetName="PART_Icon"/>
                            <Setter Property="Margin" Value="1,1,6,1" TargetName="txtHeader"/>
                            <Setter Property="MinWidth" Value="10" TargetName="txtHeader"/>
                            <Setter Property="Width" Value="0" TargetName="arrow_col"/>
                        </Trigger>
                        <!--SubmenuHeader:子菜单，有子菜单-->
                        <Trigger Property="Role" Value="SubmenuHeader">
                            <Setter Property="Visibility" Value="Visible" TargetName="PART_Arrow"/>
                            <Setter Property="Placement" Value="Right" TargetName="SubMenuPopup"/>
                        </Trigger>
                        <!--SubMenuItem:子菜单，无子级-->
                        <Trigger Property="Role" Value="SubMenuItem">
                            <Setter Property="Visibility" Value="Collapsed" TargetName="PART_Arrow"/>
                        </Trigger>
                        <!--选中状态，优先级将高于Icon-->
                        <Trigger Property="IsChecked" Value="True">
                            <Setter TargetName="PART_Icon" Value="&#xe62a;" Property="Text"></Setter>
                            <Setter TargetName="PART_Icon" Value="18" Property="FontSize"></Setter>
                            <Setter TargetName="PART_Icon" Value="{StaticResource CheckedForeground}" Property="Foreground"></Setter>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter TargetName="border" Value="{StaticResource DisableOpacity}" Property="Opacity"></Setter>
                        </Trigger>
                        <!--高亮状态-->
                        <Trigger Property="IsHighlighted" Value="true">
                            <Setter Property="Background" TargetName="border" Value="{StaticResource MenuMouseOverBackground}"></Setter>
                            <Setter Property="Foreground" Value="{StaticResource MenuMouseOverForeground}"></Setter>
                        </Trigger>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter Property="Background" TargetName="border" Value="{StaticResource MenuPressedBackground}"></Setter>
                            <Setter Property="Foreground" Value="{StaticResource MenuPressedForeground}"></Setter>
                        </Trigger>
                        <!--子菜单打开状态-->
                        <Trigger Property="IsSubmenuOpen" Value="true" >
                            <Setter TargetName="PART_Arrow" Value="{StaticResource CheckedForeground}" Property="Foreground"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!--基于FIconMenuItem的默认样式，提供Header模板-->
    <Style x:Key="DefaultMenuItem" TargetType="{x:Type MenuItem}" BasedOn="{StaticResource FIconMenuItem}">
        <Setter Property="HeaderTemplate">
            <Setter.Value>
                <DataTemplate>
                    <TextBlock x:Name="txtHeader" FontSize="{Binding FontSize,RelativeSource={RelativeSource AncestorType={x:Type MenuItem},Mode=FindAncestor}}"
                               HorizontalAlignment="Stretch" Margin="3,1,5,1"
                               Text="{Binding Header,RelativeSource={RelativeSource AncestorType={x:Type MenuItem},Mode=FindAncestor}}" VerticalAlignment="Center"
                               Foreground="{Binding Foreground,RelativeSource={RelativeSource AncestorType={x:Type MenuItem},Mode=FindAncestor}}"/>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Menu样式：  

<!--默认Menu样式-->
    <Style x:Key="DefaultMenu" TargetType="{x:Type Menu}">
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled" />
        <Setter Property="TextOptions.TextFormattingMode" Value="Ideal" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="ItemContainerStyle" Value="{StaticResource DefaultMenuItem}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Menu}">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"
                            Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                        <ItemsPresenter Margin="0" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

示例代码：  

<MenuItem Header="帮助(H)"  InputGestureText="Ctrl+H" Icon="&#xe643;" >
                    <MenuItem Header="设置" Icon="&#xE633;"/>
                    <MenuItem Icon="&#xE639;" Header="插件管理" />
                    <MenuItem Icon="&#xe655;"  Header="用户管理" />
                    <MenuItem Icon="&#xe64a;" Header="修改密码" />
                    <MenuItem Icon="" Header="在线更新" />
                    <Separator Style="{StaticResource HorizontalSeparatorStyle}"/>
                    <MenuItem Icon="&#xe657;" Header="问题反馈" />
                    <MenuItem Icon="&#xe61e;" Header="技术支持" />
                    <MenuItem Icon="&#xe60e;" Header="帮助" />
                    <MenuItem Icon="&#xe635;" Header="关于" />
                </MenuItem>

三．右键菜单ContextMenu的自定义样式

有了第二节的MenuItem样式，ContextMenu的样式很简单：  

<!--默认右键菜单ContextMenu样式-->
    <Style x:Key="DefaultContextMenu" TargetType="{x:Type ContextMenu}">
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled" />
        <Setter Property="TextOptions.TextFormattingMode" Value="Ideal" />
        <Setter Property="BorderBrush" Value="{StaticResource MenuBorderBrush}"/>
        <Setter Property="Background" Value="{StaticResource MenuBackground}"/>
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Foreground" Value="{StaticResource MenuForeground}"/>
        <Setter Property="OverridesDefaultStyle" Value="True" />
        <Setter Property="Grid.IsSharedSizeScope" Value="True" />
        <Setter Property="HasDropShadow" Value="True" />
        <Setter Property="ItemContainerStyle" Value="{StaticResource DefaultMenuItem}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ContextMenu}">
                    <Grid>
                        <Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" Margin="5"
                                BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"
                                Padding="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                            <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Cycle"
                                                Grid.IsSharedSizeScope="True" Margin="0" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                                KeyboardNavigation.TabNavigation="Cycle" />
                        </Border>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="HasDropShadow" Value="True">
                            <Setter TargetName="Border" Property="Effect" Value="{StaticResource DefaultDropShadow}">
                            </Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

实现一个文本操作（剪切、复制、粘贴）的样式：  

 <!--文本操作右键菜单-->
    <ContextMenu x:Key="TextBoxContextMenu" Style="{StaticResource DefaultContextMenu}">
        <MenuItem Command="ApplicationCommands.Cut" Icon="&#xe662;" Style="{DynamicResource DefaultMenuItem}" />
        <MenuItem Command="ApplicationCommands.Copy" Icon="&#xe661;" Style="{DynamicResource DefaultMenuItem}" />
        <MenuItem Command="ApplicationCommands.Paste" Icon="&#xe663;" Style="{DynamicResource DefaultMenuItem}" />
    </ContextMenu>

效果图：

 

四．树控件TreeView的自定义样式

4.1TreeView基本样式

TreeView的样式比较简单，相比ListBox，主要多了层级关系，节点的展开、收缩。效果图：

样式定义中默认是开启虚拟化，以支持大数据，数据不多时最好关闭。样式代码：

<!--TreeViewItem默认样式-->
    <Style  x:Key="DefaultTreeViewItem" TargetType="{x:Type TreeViewItem}">
        <Setter Property="MinHeight" Value="25" />
        <Setter Property="Foreground" Value="{StaticResource TextForeground}" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="Margin" Value="0" />
        <Setter Property="local:ControlAttachProperty.FIconSize" Value="19"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TreeViewItem}">
                    <StackPanel>
                        <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"
                                MinHeight="{TemplateBinding MinHeight}" UseLayoutRounding="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                            <!--多层级间隔，暂缓-->
                            <!--<Grid Margin="{Binding Converter={StaticResource LengthConverter}, RelativeSource={x:Static RelativeSource.TemplatedParent}}"-->
                            <Grid Margin="{TemplateBinding Margin}" VerticalAlignment="Stretch">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition MinWidth="18" Width="Auto" />
                                    <ColumnDefinition Width="*" />
                                </Grid.ColumnDefinitions>
                                <!--展开收缩按钮-->
                                <ToggleButton x:Name="ExpanderBtn" 
                                              IsChecked="{Binding Path=IsExpanded, RelativeSource={x:Static RelativeSource.TemplatedParent}, Mode=TwoWay}"
                                              ClickMode="Press" >
                                    <ToggleButton.Template>
                                        <ControlTemplate TargetType="ToggleButton">
                                            <Border>
                                                <ContentPresenter VerticalAlignment="Center" HorizontalAlignment="Center" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                                            </Border>
                                        </ControlTemplate>
                                    </ToggleButton.Template>
                                    <ToggleButton.Content>
                                        <TextBlock x:Name="ExpanderIcon"  Foreground="{TemplateBinding Foreground}" Text="&#xe62c;" Style="{StaticResource FIcon}"
                                                   FontSize="{TemplateBinding local:ControlAttachProperty.FIconSize}" />
                                    </ToggleButton.Content>
                                </ToggleButton>
                                <!--内容-->
                                <ContentPresenter x:Name="PART_Header" Grid.Column="1" ContentSource="Header"
                                                  SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                                  HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                  VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                            </Grid>
                        </Border>
                        <ItemsPresenter Margin="18,0,0,0" x:Name="ItemsHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </StackPanel>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="False">
                            <Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed" />
                        </Trigger>
                        <Trigger Property="IsExpanded" Value="True">
                            <Setter TargetName="ExpanderIcon" Property="Text" Value="&#xe62d;" />
                        </Trigger>
                        <Trigger Property="HasItems" Value="False">
                            <Setter TargetName="ExpanderIcon" Property="Visibility" Value="Hidden" />
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="{StaticResource ItemMouseOverBackground}" />
                            <Setter Property="Foreground" Value="{StaticResource ItemMouseOverForeground}" />
                        </Trigger>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter Property="Background" Value="{StaticResource ItemSelectedBackground}" />
                            <Setter Property="Foreground" Value="{StaticResource ItemSelectedForeground}" />
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="True" />
                                <Condition Property="Selector.IsSelectionActive" Value="True" />
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" Value="{StaticResource ItemSelectedBackground}" />
                            <Setter Property="Foreground" Value="{StaticResource ItemSelectedForeground}" />
                        </MultiTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!--TreeView样式-->
    <Style x:Key="DefaultTreeView" TargetType="{x:Type TreeView}">
        <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" />
        <Setter Property="Background" Value="{StaticResource ItemsContentBackground}"/>
        <Setter Property="ItemContainerStyle" Value="{StaticResource DefaultTreeViewItem}"></Setter>
        <Setter Property="ItemsPanel">
            <Setter.Value>
                <ItemsPanelTemplate>
                    <VirtualizingStackPanel IsItemsHost="True" IsVirtualizing="True" VirtualizationMode="Recycling" Margin="0"/>
                </ItemsPanelTemplate>
            </Setter.Value>
        </Setter>
    </Style>

4.2 TreeView的右键菜单实现

　　TreeView支持右键操作应该是比较常见的需求，实现很简单，效果演示：

示例代码：  

<HierarchicalDataTemplate x:Key="ItemNode"  DataType="{x:Type local:NodeX}" ItemsSource="{Binding Nodes}">
            <StackPanel Orientation="Horizontal" Height="28">
                <core:FImage Source="{Binding Icon}" Width="22" Height="22"></core:FImage>
                <TextBlock Text="{Binding Name}" FontSize="13" VerticalAlignment="Center" Margin="3,0,0,0"></TextBlock>
            </StackPanel>
        </HierarchicalDataTemplate>
            
<TreeView Width="250"  Margin="3" x:Name="tree1" ItemTemplate="{StaticResource ItemNode}">
                <TreeView.ItemContainerStyle>
                    <Style BasedOn="{StaticResource DefaultTreeViewItem}" TargetType="{x:Type TreeViewItem}">
                        <EventSetter Event="TreeViewItem.PreviewMouseRightButtonDown" Handler="TreeViewItem_PreviewMouseRightButtonDown"/>
                    </Style>
                </TreeView.ItemContainerStyle>
                <TreeView.ContextMenu>
                    <ContextMenu>
                        <MenuItem  Icon="&#xe662;" Header="展开" Click="MenuItem_OnClick"  Style="{DynamicResource DefaultMenuItem}" />
                        <MenuItem  Icon="&#xe661;" Header="剪切" Style="{DynamicResource DefaultMenuItem}" />
                        <MenuItem  Icon="&#xe663;" Header="赋值" Style="{DynamicResource DefaultMenuItem}" />
                    </ContextMenu>
                </TreeView.ContextMenu>
            </TreeView>

后台C#代码：  

private void TreeViewItem_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            var treeViewItem = VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject) as TreeViewItem;
            if (treeViewItem != null)
            {
                treeViewItem.Focus();
                e.Handled = true;
            }
        }

        static DependencyObject VisualUpwardSearch<T>(DependencyObject source)
        {
            while (source != null && source.GetType() != typeof(T))
                source = VisualTreeHelper.GetParent(source);

            return source;
        }

        private void MenuItem_OnClick(object sender, RoutedEventArgs e)
        {
            var item = this.tree1.SelectedItem as NodeX;
            if (item != null)
            {
                MessageBoxX.Info(item.Name.ToString());
            }
        }

原文地址：https://www.cnblogs.com/anding/p/4996614.html

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