当它获得焦点时展开组合框及其项目 [英] Expand the combobox and its items when it gets focus

问题描述

我想在组合框获得焦点时扩展组合框的高度.

I want to expand the height of the combobox whenever the combobox gets the Focus.

我使用以下代码来扩展组合框高度.

I have used the following code to expand the combobox height.

<Style TargetType="{x:Type ComboBox}">    
<Style.Triggers>    
    <Trigger Property="IsKeyboardFocusWithin" Value="True">    
        <Setter Property="RenderTransform">   
            <Setter.Value>   
                <ScaleTransform ScaleX="1" ScaleY="2" />   
            </Setter.Value>   
        </Setter>   
        <Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>    
        <Setter Property="Panel.ZIndex" Value="99999"/>    
    </Trigger>    
</Style.Triggers>  
</Style>

问题:

当我第一次将焦点放在组合框上时，组合框项目列表以正常模式打开.但是，如果我再次单击组合框，则会打开组合框项目列表，并展开列表项目高度.

When i put the focus on the Combobox first time, the combobox item list opened in normal mode. But if i again click on the combobox then combobx item list opened and also list items height is expanded.

但我希望组合框列表项即使在第一次单击(焦点)时也能展开.即使我选择了组合框项目中的项目，组合框高度也必须处于展开模式.

But i want the combobox list items to be expanded even in the first click (focus) also. Also combobox height must be in expanded mode even when i select the item in the Combobox item.

提前致谢

推荐答案

这是您想要的吗?

        <Style TargetType="{x:Type ComboBox}">
            <Style.Triggers>
                <Trigger Property="IsKeyboardFocusWithin" Value="True">
                    <Setter Property="IsDropDownOpen" Value="true" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </ComboBox.Style>

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