WPF树视图项目背景在整个行上 [英] WPF treeview item background over entire row

问题描述

我正在编写一个应用程序，我需要在整个行中按项目设置背景。我在此处中找到了一些灵​​感，但我不知道如何获得边框模板中的背景值（问题有点复杂：）

i am writing one app and i need to set background under entire row by items. I found some inspiration in here but i cannot get idea how to get Border background value in template (the problem is a bit more complicated:)

我的问题是在树形视图中有两种类型的数据（文件和文件夹）。用户可以在文件和文件夹下修改背景。

My problem is that in the treeview are 2 types of "data" (files and folders). User can modify the background under files and folders.

现在我在textblock上有背景，但它看起来很可怕，我想在整行中都有背景（我认为它看起来会好得多）。

Right now i have the background on textblock, but it seems horrible and i want to have the background over entire row (i think it will looks much better).

现在看来是这样：

Now it seems so:

但是我需要的是：

but what i need is:

如果我更改边框背景的值，则会（逻辑上）更改所有项目。因此，我想我确实需要使用textblock背景，但是我无法在整个行上进行扩展（拉伸不是解决方案，因为它只是将其扩展到行的末尾而不是之前的空白）。

If i change the value of the border background, i change all items (logically). So i guess i really need to work with the textblock background, but i cannot reach spreading over entire row (stretch is not a solution, because it spread it just to the end of the line but not that white space before).

谢谢您的建议。

编辑： XAML在这里：

EDIT : XAML in here:

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:treeView">
<!-- TREEVIEW  -->
    <Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
        <Setter Property="Focusable" Value="False"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ToggleButton">
                    <Grid
          Width="15"
          Height="13"
          Background="Transparent">
                        <!--<Path x:Name="ExpandPath"
            HorizontalAlignment="Left" 
            VerticalAlignment="Center" 
            Margin="1,1,1,1"
            Fill="Red"
            Data="M 4 0 L 8 4 L 4 8 Z"/>-->
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked"
               Value="True">
                            <!--<Setter Property="Data"
                TargetName="ExpandPath"
                Value="M 0 4 L 8 4 L 4 8 Z"/>-->
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="TreeViewItemFocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Border>
                        <Rectangle Margin="0,0,0,0"
                 StrokeThickness="5"
                 Stroke="Black"
                 StrokeDashArray="1 2"
                 Opacity="0"/>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>


    <Style x:Key="{x:Type TreeViewItem}" 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}">
                    <ControlTemplate.Resources>
                        <local:LeftMarginMultiplierConverter Length="19" x:Key="lengthConverter" />
                    </ControlTemplate.Resources>
                    <StackPanel>
                        <Border x:Name="Bd"
                          Background="{TemplateBinding Background}"
                          BorderBrush="{TemplateBinding BorderBrush}"
                          BorderThickness="{TemplateBinding BorderThickness}"
                          Padding="{TemplateBinding Padding}">
                            <Grid Margin="{Binding Converter={StaticResource lengthConverter}, RelativeSource={RelativeSource TemplatedParent}}">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="19" />
                                    <ColumnDefinition/>
                                </Grid.ColumnDefinitions>
                                <ToggleButton Grid.Column="1" x:Name="Expander"
                                  Style="{StaticResource ExpandCollapseToggleStyle}"
                                  IsChecked="{Binding Path=IsExpanded,
                                              RelativeSource={RelativeSource TemplatedParent}}"
                                  ClickMode="Press"/>
                                <ContentPresenter x:Name="PART_Header" Grid.Column="1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" ContentSource="Header" />
                            </Grid>
                        </Border>
                        <ItemsPresenter x:Name="ItemsHost" />
                    </StackPanel>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="false">
                            <Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed"/>
                        </Trigger>
                        <Trigger Property="HasItems" Value="false">
                            <Setter TargetName="Expander" Property="Visibility" Value="Hidden"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HasHeader" Value="false"/>
                                <Condition Property="Width" Value="Auto"/>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="PART_Header" Property="MinWidth" Value="75"/>
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="HasHeader" Value="false"/>
                                <Condition Property="Height" Value="Auto"/>
                            </MultiTrigger.Conditions>
                            <Setter TargetName="PART_Header" Property="MinHeight" Value="19"/>
                        </MultiTrigger>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter TargetName="Bd" Property="Background" 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 TargetName="Bd" Property="Background" 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>
</ResourceDictionary>

推荐答案

使用snoop来了解您要尝试的视觉树修改。通过这种方式，将需要2-3分钟才能真正知道您需要修改的内容。 （google）

Use snoop to understand the visual tree you are trying to modify. This way it will take 2-3 minutes to actually know what you need to modify. ( google )

我敢打赌，您需要使用以下内容：

My bet is that you need to use something like this:

<TreeView>
<TreeView.ItemContainerStyle>
<Style BasedOn="{StaticResource {x:Type TreeViewItem}}" TargetType="TreeViewItem">
                    <Setter Property="Background" Value="Purple" />
</TreeView.ItemContainerStyle>
</TreeView>

如果要根据项目使用背景色，还需要添加触发器。

you will also need to add triggers if you want background colo depending on items.

这篇关于WPF树视图项目背景在整个行上的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！