Looking for a WPF ComboBox with checkboxes - wpf

Question

My google skills fail me. Anyone heard of a control like that for WPF. I am trying to make it look like this (winforms screenshot).

Answer 1

You can do this yourself by setting the DataTemplate of the combo box. This article shows you how - for a listbox, but the principle is the same.
Another article here is perhaps a better fit for what you are trying to do, simple set the first column of the item template to be a checkbox and bind it to a bool on your business object.
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding IsSelected}"
Width="20" />
<TextBlock Text="{Binding DayOfWeek}"
Width="100" />
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>

Answer 2

There is my combobox. I use Martin Harris code and code from this link Can a WPF ComboBox display alternative text when its selection is null?
<ComboBox Name="cbObjects" Grid.Column="1" Grid.Row="1" VerticalAlignment="Center" Margin="2,2,6,0" SelectionChanged="OnCbObjectsSelectionChanged" >
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding IsSelected}" Width="20" VerticalAlignment="Center" Checked="OnCbObjectCheckBoxChecked" Unchecked="OnCbObjectCheckBoxChecked" />
<TextBlock Text="{Binding ObjectData}" VerticalAlignment="Center" />
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<TextBlock IsHitTestVisible="False" Name="tbObjects" Text="Выберите объекты..." Grid.Column="1" Grid.Row="1" VerticalAlignment="Center" Margin="6,2,6,0" />
Small class for datasource:
public class SelectableObject <T> {
public bool IsSelected { get; set; }
public T ObjectData { get; set; }
public SelectableObject(T objectData) {
ObjectData = objectData;
}
public SelectableObject(T objectData, bool isSelected) {
IsSelected = isSelected;
ObjectData = objectData;
}
}
And there is two handler - one for handling CheckBox clicked and one for forming Text for ComboBox.
private void OnCbObjectCheckBoxChecked(object sender, RoutedEventArgs e) {
StringBuilder sb = new StringBuilder();
foreach (SelectableObject<tblObject> cbObject in cbObjects.Items)
{
if (cbObject.IsSelected)
sb.AppendFormat("{0}, ", cbObject.ObjectData.Description);
}
tbObjects.Text = sb.ToString().Trim().TrimEnd(',');
}
private void OnCbObjectsSelectionChanged(object sender, SelectionChangedEventArgs e) {
ComboBox comboBox = (ComboBox)sender;
comboBox.SelectedItem = null;
}
For ComboBox.ItemsSource I use
ObservableCollection<SelectableObject<tblObject>>
where tblObject is type of my object, a list of which I want to display in ComboBox.
I hope this code is useful to someone!

Answer 3

Give a try to CheckComboBox from Extended WPF Toolkit.
The main advantage for me is having two lists for binding:
all items available for selection
just selected items
I find this approach more practical. In addition you can specify value and display members of the collections you're binding.
If you don't want to bring a bunch of other controls with CheckComboBox, you can get the source code of it, it's pretty straightforward (need to bring Selector class as well).

Answer 4

ComboBox with Checkboxes
<ComboBox Height="16" Width="15">
<CheckBox Content="First Checkbox" />
<CheckBox Content="Second Checkbox" />
<CheckBox Content="Third Checkbox" />
<TextBlock Text="Some Text" />
</ComboBox>
The provided answers surprisingly didn't work for me, I tried many variations and kept getting error messages about the checkbox not being part of combobox and the data context seemed to be broken.
In the end I didn't have to do anything involving data templates or any code behind and my bindings are working fine (not shown in example)
I must say I'm happy with how easy this turned out to be after reading all the answers.