CODEWITHSUNDEEP
c#.netwpfpopup
DotNetSpartan
DotNetSpartan

Reputation: 1001

Controlling the open and close of Popup from a Button click in WPF

My requirement is to control the closing/opening of popup from a Button. In my below piece of code by clicking on button the popup opens up but it doesn't closes on the next click.

XAML

 <Button x:Name="Btn" Height="20" Width="120" HorizontalAlignment="Center" 
                                   VerticalAlignment="Center">
                        <TextBlock Text="Show Popup"/>
                        <Button.Triggers>
                            <EventTrigger RoutedEvent="Button.Click">
                                <EventTrigger.Actions>
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <BooleanAnimationUsingKeyFrames 
                                             Storyboard.TargetName="Popup" 
                                             Storyboard.TargetProperty="IsOpen">
                                        <DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="True" />
                                            </BooleanAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </BeginStoryboard>
                                </EventTrigger.Actions>
                            </EventTrigger>
                        </Button.Triggers>
                    </Button>
                     <Popup x:Name="Popup" StaysOpen="False"  
        Height="100" Width="300" Background= "Yellow" 
    
    PlacementTarget="{Binding ElementName=Btn}"></Popup>

Note: I am able to achieve the above case using a Toggle button, But my requirement is very specific to button only.

Upvotes: 0

Views: 1756

Answers (1)

BionicCode
BionicCode

Reputation: 29028

You can't do it without toggling i.e. Button alone can't do it. You are handling a control that has a state: opened and closed. You need to know the current state. To achieve this, add a flag to the hosting control (requires code-behind) or use the flag of the Popup (requires code-behind) or use the flag of the ToggleButton (no code-behind).

It doesn't make any sense to avoid the ToggleButton: it's a Button that additionally knows or has a state. It can handle ICommand or emit a Click event - it's a Button. It's exactly what you need.

You don't have to explicitly add a TextBlock to the Content of the Button. When assigning a string to Button.Content, the control will automatically create a TextBlock to show the string.

MainWindow.xaml

<Button Click="TogglePopup_OnClick"
        Content="Show Popup" />
                
<Popup x:Name="Popup" />

MainWindow.xaml.cs

private void TogglePopup_OnClick(object sender, EventArgs e)
  => this.Popup.IsOpen ^= true;

Upvotes: 1

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