wpf 具有多于一列的 TreeView
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时间：2020-09-13 08:51:43 来源:igfitidea点击:
TreeView with more than one column
提问by Holly
I have a basic class that looks something like this:
我有一个看起来像这样的基本类：
public class Item
{
private string name;
private bool visible;
private double value;
private Item parent;
private List<Item> children = new List<Item>();
…
}
I have a list of Items that I need to display in a treeview. For each Item I need to display the following fields:
我有一个需要在树视图中显示的项目列表。对于每个项目，我需要显示以下字段：
- 'visible' as a checkbox
- 'name' as a textblock
- 'value' as a slider
- “可见”作为复选框
- 'name' 作为文本块
- “值”作为滑块
I want to do so by using MVVM, so I've defined the following classes 'ItemViewModel' and 'ItemCollectionViewModel' to which I will bind my treeview.
我想通过使用 MVVM 来做到这一点，所以我定义了以下类“ItemViewModel”和“ItemCollectionViewModel”，我将把我的树视图绑定到它们。
I tried the following XAML:
我尝试了以下 XAML：
<TreeView ItemsSource="{Binding ItemViewModelList}">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition SharedSizeGroup="VisibiltyCol" />
<ColumnDefinition SharedSizeGroup="NameCol" />
<ColumnDefinition SharedSizeGroup="ValueCol" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0" IsChecked="{Binding Visible}" Margin="5" />
<TextBlock Grid.Column="1" Text="{Binding Name}" Margin="5" />
<Slider Grid.Column="2" Value="{Binding Value}" Width="100" Margin="10, 0, 0, 0" Maximum="1" />
</Grid>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
It works fine, except that I want all the sliders to be right below each other, and they are not. (Just those who are at the same level of hierarchy appear right under each other).
它工作正常，除了我希望所有滑块都在彼此的正下方，而它们不是。（只是那些处于同一层次结构的人出现在彼此的正下方）。
In other words, I need the tree to display the sliders (representing the 'Value' property) in another column.
换句话说，我需要树在另一列中显示滑块（代表“值”属性）。
Can someone help?
有人可以帮忙吗？
回答by Lee Louviere
- Make the grids stretch (so horizontalalignment.stretch), make the items in the treeview stretch as well (horizontalcontentalignment.stretch), whatever it takes to do that. Then have the third column have a shared column size.
- You'll need this custom TreeViewItem style. Also attached below.
- 使网格拉伸（所以水平对齐。拉伸），使树视图中的项目也拉伸（水平内容对齐。拉伸），无论需要做什么。然后让第三列有一个共享的列大小。
- 您将需要此自定义 TreeViewItem 样式。下面也附上。
Then the TreeView would look like this.
然后 TreeView 看起来像这样。
<TreeView HorizontalContentAlignment="Stretch" Name="DTV" ItemsSource="{Binding DTVIList}" Grid.Row="1"
ItemContainerStyle="{StaticResource TreeViewItemStyle1}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="100" SharedSizeGroup="SliderColumn"/>
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0" IsChecked="{Binding Visible}" Margin="5" />
<TextBlock Grid.Column="1" Text="{Binding Name}" Margin="5" />
<Slider Grid.Column="2" Value="{Binding Value}" Width="100" Margin="10, 0, 0, 0" Maximum="1" />
</Grid>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
This should do it.
这应该这样做。
TreeViewStyle attached:
附树视图样式：
<Style x:Key="TreeViewItemFocusVisual">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<PathGeometry x:Key="TreeArrow" Figures="M0,0 L0,6 L6,0 z"/>
<Style x:Key="ExpandCollapseToggleStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Width" Value="16"/>
<Setter Property="Height" Value="16"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Width="16" Height="16" Background="Transparent" Padding="5,5,5,5">
<Path x:Name="ExpandPath" Fill="Transparent" Stroke="#FF989898" Data="{StaticResource TreeArrow}">
<Path.RenderTransform>
<RotateTransform Angle="135" CenterX="3" CenterY="3"/>
</Path.RenderTransform>
</Path>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Stroke" TargetName="ExpandPath" Value="#FF1BBBFA"/>
<Setter Property="Fill" TargetName="ExpandPath" Value="Transparent"/>
</Trigger>
<Trigger Property="IsChecked" Value="True">
<Setter Property="RenderTransform" TargetName="ExpandPath">
<Setter.Value>
<RotateTransform Angle="180" CenterX="3" CenterY="3"/>
</Setter.Value>
</Setter>
<Setter Property="Fill" TargetName="ExpandPath" Value="#FF595959"/>
<Setter Property="Stroke" TargetName="ExpandPath" Value="#FF262626"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="TreeViewItemStyle1" TargetType="{x:Type TreeViewItem}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="HorizontalContentAlignment" Value="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="VerticalContentAlignment" Value="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="Padding" Value="1,0,0,0"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<ToggleButton x:Name="Expander" Style="{StaticResource ExpandCollapseToggleStyle}" ClickMode="Press" IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"/>
<Border x:Name="Bd" SnapsToDevicePixels="true" Grid.Column="1" Grid.ColumnSpan="2" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
<ContentPresenter x:Name="PART_Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header"/>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="1"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="false">
<Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsSelectionActive" Value="false"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
