CODEWITHSUNDEEP
c#.netwinformscombobox
aharon
aharon

Reputation: 7643

How can I make a combobox stay open after an item has been selected?

How do I make a combobox stay open after an item is selected in C#?

I want to do this because it is actually a comboBox with a checklist so I can select several items.

Upvotes: 6

Views: 6250

Answers (5)

PauLEffect
PauLEffect

Reputation: 423

While I realize the question was intended for winforms, please allow me to contribute an answer for wpf seekers(as I got here, actually).

simply put something like this in the combo box.

<Grid>
    <ComboBox Width="1" Height="1" IsDropDownOpen="{Binding ElementName=TButton,Path=IsChecked,Mode=TwoWay}">
        <Grid Width="200" Height="400" Background="BlanchedAlmond" Margin="-5" IsHitTestVisible="True">
            <Button Background="Transparent"></Button> <--------- This is the equivalent of a e.handled
            <StackPanel>
                <Button Content="Button 1"/>
                <Button Content="Button 1"/>
                <Button Content="Button 1"/>
                <Button Content="Button 1"/>
            </StackPanel>
        </Grid>
    </ComboBox>
   <ToggleButton x:Name="TButton" Content="Drop" MaxHeight="40" MaxWidth="40"/>
</Grid>

Quick and dirty fix for a decent, hassle free drop down control.

When you click the combobox item, you actually click the invisible button and the combo stays open.

I've tried with a hittest visible rect, but no dice. This does the trick.

Note

One should replace the invisible background with a style that completely strips the button (when mouse is over or a click is performed).

Also, a drop font icon / path instead of drop would be nice. :)

I apologize again for posting here. I've been looking all over the place for a quick drop down control with 0 outside dependencies(popup won't do) and all I've stumbled across are ridiculously (needlessly) complicated implementations. I hope this will steer somebody in the right direction!

Best of luck to you!

Edit A simple opacity 0 will do. Doh...

Upvotes: 1

ashishduh
ashishduh

Reputation: 6699

This functionality is available in .NET 3.0 and beyond. Use the ComboBox.StaysOpenOnEdit property

Upvotes: 1

MusiGenesis
MusiGenesis

Reputation: 75276

Use a ListBox instead of a ComboBox. What you want to do (keep a ComboBox open even after the user has selected a choice) would be unusual and unexpected behavior.

Update: I think this sample will let you do what you want (which is to have a multi-select list that only takes up the form real estate of one control):

http://www.codeguru.com/csharp/csharp/cs_controls/treeview/article.php/c15373/

Upvotes: 2

Adrian F&#226;ciu
Adrian F&#226;ciu

Reputation: 12552

If you still want to allow the user to write an option of his own you can still use a DropBox, just set the DropDownStyle property to simple. You'll get something similar with a ListBox but with an TextBox on the top where the user can write somwthing.

Upvotes: 4

Ken D
Ken D

Reputation: 5968

Use ListBox instead, since ComboBox does that behavior by its core design.

ListBox gives a similar effect (hence it is still open) and enabling for multi-selection.

Upvotes: 5

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