如何设置一个触发孩子父母的财产？ [英] How to set a Trigger on a child to a parent property?

问题描述

我有一个切换按钮（ExpanderButton）一个TreeView。切换按钮有两个图像（一个用于扩展和一个不用时）。然而，当我选择一个树型视图我用不同的颜色highligh它，我想改变图像的颜色，以及（我有其他颜色相同的）。

I have a TreeView with a ToggleButton ( ExpanderButton ). The togglebutton has a two images ( one for expanded and one when not ). However when I select a TreeViewItem I highligh it with a different color and I'd like to change the color of the images as well ( I have the same ones in the other color ).

但问题是我不知道如何在切换按钮设置触发属性的树型视图IsSelected属性。

Problem is I don't know how to set a trigger property on the ToggleButton to the IsSelected property on the TreeViewItem.

任何想法？

推荐答案

下面是否有人需要这个。

Here if anyone else needs this.

<ControlTemplate TargetType="ToggleButton">
                <Image Name="ExpanderImage" Height="24" Width="24" Source="..\Images\Icons\32x32\Blue\Open.png" />
                <ControlTemplate.Triggers>
                    <Trigger Property="IsChecked" Value="True">
                        <Setter TargetName="ExpanderImage" Property="Source" Value="..\Images\Icons\32x32\Blue\Close.png" />
                    </Trigger>
                    <DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
                        <Setter TargetName="ExpanderImage" Property="Source" Value="..\Images\Icons\32x32\Green\Open.png" />
                    </DataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsChecked, RelativeSource={RelativeSource Self}}" Value="True" />
                            <Condition Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource TemplatedParent}}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter TargetName="ExpanderImage" Property="Source" Value="..\Images\Icons\32x32\Green\Close.png" />
                    </MultiDataTrigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>

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