Disable WPF ComboBox DropDown while editing

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Hi,

i want to disable the dropdown of a combobox, when the property "isEditable" is set to true and vice versa. Therefore i've created a custom control which inherits from ComboBox.

After pasting the standard control template from the ComboBox into the Generic.xaml and starting the app, the combobox is only visible when i hover over with the mouse. I didn't change anything in the control template so far.

1. Shouldn't it be displayed as a normal ComboBox?

2. Is this the right approach to lock the DropDown while editing?

XML

<Trigger Property="ComboBox.IsEditable" Value="True">
  <Setter Property="UIElement.IsEnabled" Value="False" />
</Trigger>

Posted 12-Dec-12 3:01am

maschle

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Ivan Leonenko · Accepted Answer · 2012-12-12T04:30:00

It is not clear for me what you are trying to achieve.

But if you want dropdown not to be shown when IsEditable is set to True and appear when IsEditable is False, then you can check this code (add to ControlTemplate.Triggers):

XML

<MultiTrigger>
    <MultiTrigger.Conditions>
        <Condition Property="IsEditable" Value="True"></Condition>
        <Condition  Property="IsDropDownOpen" Value="True"></Condition>
    </MultiTrigger.Conditions>
    <Setter TargetName="Popup" Property="IsOpen" Value="False"></Setter>
</MultiTrigger>
<Trigger Property="ComboBox.IsEditable" Value="True">
    <Setter TargetName="ToggleButton" Property="IsEnabled" Value="False" />
</Trigger>

Drop down can be shown if user clicks toggle button or presses Alt + UpArrow/DownArrow. So here we are disabling/enabling toggle button and making popup show logic depend on IsEditable.