How to open a WPF Popup when another control is clicked using XAML markup only

Question

I ve got two controls  a TextBlock and a PopUp  When the user clicks  MouseDown  on the textblock  I want to display the popup  I would think that I could do this with an EventTrigger on the Popup  but I can t use setters in an EventTrigger  I can only start storyboards  I want to do this strictly in XAML  because the two controls are in a template and I don t know how I d find the popup in code   This is what conceptually I want to do  but can t because you can t put a setter in an EventTrigger  like you can with a DataTrigger     lt TextBlock x Name  CCD  gt Some text lt  TextBlock gt    lt Popup gt       lt Popup Style gt           lt Style gt               lt Style Triggers gt                   lt EventTrigger SourceName  CCD  RoutedEvent  MouseDown  gt                       lt Setter Property  Popup IsOpen  Value  True    gt                   lt  EventTrigger gt               lt  Style Triggers gt           lt  Style gt       lt  Popup Style gt        What is the best way to show a popup strictly in XAML when an event happens on a different control

User · Answer

I had some issues with the MouseDown part of this  but here is some code that might get your started    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Window1  Height  300  Width  300  gt       lt Grid gt           lt Control VerticalAlignment  Top  gt               lt Control Template gt                   lt ControlTemplate gt                       lt StackPanel gt                       lt TextBox x Name  MyText  gt  lt  TextBox gt                       lt Popup x Name  Popup  PopupAnimation  Fade  VerticalAlignment  Top  gt                           lt Border Background  Red  gt                               lt TextBlock gt Test Popup Content lt  TextBlock gt                           lt  Border gt                       lt  Popup gt                       lt  StackPanel gt                       lt ControlTemplate Triggers gt                           lt EventTrigger RoutedEvent  UIElement MouseEnter  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  True   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                           lt EventTrigger RoutedEvent  UIElement MouseLeave  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  False   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                       lt  ControlTemplate Triggers gt                   lt  ControlTemplate gt               lt  Control Template gt           lt  Control gt       lt  Grid gt   lt  Window gt

User · Answer

I did something simple  but it works   I used a typical ToggleButton  which I restyled as a textblock by changing its control template   Then I just bound the IsChecked property on the ToggleButton to the IsOpen property on the popup   Popup has some properties like StaysOpen that let you modify the closing behavior   The following works in XamlPad     lt StackPanel gt     lt ToggleButton Name  button  gt        lt ToggleButton Template gt         lt ControlTemplate TargetType  ToggleButton  gt           lt TextBlock gt Click Me Here   lt  TextBlock gt         lt  ControlTemplate gt             lt  ToggleButton Template gt     lt  ToggleButton gt     lt Popup IsOpen   Binding IsChecked  ElementName button   StaysOpen  False  gt       lt Border Background  LightYellow  gt         lt TextBlock gt I m the popup lt  TextBlock gt       lt  Border gt     lt  Popup gt     lt  StackPanel gt

User · Answer

I had some issues with the MouseDown part of this  but here is some code that might get your started    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Window1  Height  300  Width  300  gt       lt Grid gt           lt Control VerticalAlignment  Top  gt               lt Control Template gt                   lt ControlTemplate gt                       lt StackPanel gt                       lt TextBox x Name  MyText  gt  lt  TextBox gt                       lt Popup x Name  Popup  PopupAnimation  Fade  VerticalAlignment  Top  gt                           lt Border Background  Red  gt                               lt TextBlock gt Test Popup Content lt  TextBlock gt                           lt  Border gt                       lt  Popup gt                       lt  StackPanel gt                       lt ControlTemplate Triggers gt                           lt EventTrigger RoutedEvent  UIElement MouseEnter  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  True   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                           lt EventTrigger RoutedEvent  UIElement MouseLeave  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  False   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                       lt  ControlTemplate Triggers gt                   lt  ControlTemplate gt               lt  Control Template gt           lt  Control gt       lt  Grid gt   lt  Window gt

User · Answer

another way to do it    lt Border x Name  Bd  BorderBrush   TemplateBinding BorderBrush   BorderThickness   TemplateBinding BorderThickness   Background   TemplateBinding Background   Padding   TemplateBinding Padding   SnapsToDevicePixels  true  gt                       lt StackPanel gt                           lt Image Source   Binding ProductImage RelativeSource  RelativeSource TemplatedParent    Stretch  Fill  Width  65  Height  85   gt                           lt ContentPresenter HorizontalAlignment   TemplateBinding HorizontalContentAlignment   SnapsToDevicePixels   TemplateBinding SnapsToDevicePixels   VerticalAlignment   TemplateBinding VerticalContentAlignment    gt                           lt Button x Name  myButton  Width  40  Height  10  gt                               lt Popup Width  100  Height  70  IsOpen   Binding ElementName myButton Path IsMouseOver  Mode OneWay   gt                                   lt StackPanel Background  Yellow  gt                                       lt ItemsControl ItemsSource   Binding Produkt SubProducts    gt                                   lt  StackPanel gt                               lt  Popup gt                           lt  Button gt                       lt  StackPanel gt                   lt  Border gt

User · Answer

The following uses EventTrigger to show the Popup  This means we don t need a ToggleButton for state binding  In this example the Click event of a Button is used  You can adapt it to use another element event combination    lt Button x Name  OpenPopup  gt Popup      lt Button Triggers gt           lt EventTrigger RoutedEvent  Button Click  gt               lt EventTrigger Actions gt                   lt BeginStoryboard gt                       lt Storyboard gt                           lt BooleanAnimationUsingKeyFrames                                   Storyboard TargetName  ContextPopup                                    Storyboard TargetProperty  IsOpen  gt                               lt DiscreteBooleanKeyFrame KeyTime  0 0 0  Value  True    gt                           lt  BooleanAnimationUsingKeyFrames gt                       lt  Storyboard gt                   lt  BeginStoryboard gt               lt  EventTrigger Actions gt           lt  EventTrigger gt       lt  Button Triggers gt   lt  Button gt   lt Popup x Name  ContextPopup         PlacementTarget   Binding ElementName OpenPopup          StaysOpen  False  gt       lt Label gt Popupcontent    lt  Label gt   lt  Popup gt    Please note that the Popup is referencing the Button by name and vice versa  So x Name       is required on both  the Popup and the Button   It can actually be further simplified by replacing the Storyboard stuff with a custom SetProperty EventTrigger Action described in this SO Answer

User · Answer

another way to do it    lt Border x Name  Bd  BorderBrush   TemplateBinding BorderBrush   BorderThickness   TemplateBinding BorderThickness   Background   TemplateBinding Background   Padding   TemplateBinding Padding   SnapsToDevicePixels  true  gt                       lt StackPanel gt                           lt Image Source   Binding ProductImage RelativeSource  RelativeSource TemplatedParent    Stretch  Fill  Width  65  Height  85   gt                           lt ContentPresenter HorizontalAlignment   TemplateBinding HorizontalContentAlignment   SnapsToDevicePixels   TemplateBinding SnapsToDevicePixels   VerticalAlignment   TemplateBinding VerticalContentAlignment    gt                           lt Button x Name  myButton  Width  40  Height  10  gt                               lt Popup Width  100  Height  70  IsOpen   Binding ElementName myButton Path IsMouseOver  Mode OneWay   gt                                   lt StackPanel Background  Yellow  gt                                       lt ItemsControl ItemsSource   Binding Produkt SubProducts    gt                                   lt  StackPanel gt                               lt  Popup gt                           lt  Button gt                       lt  StackPanel gt                   lt  Border gt

User · Answer

I did something simple  but it works   I used a typical ToggleButton  which I restyled as a textblock by changing its control template   Then I just bound the IsChecked property on the ToggleButton to the IsOpen property on the popup   Popup has some properties like StaysOpen that let you modify the closing behavior   The following works in XamlPad     lt StackPanel gt     lt ToggleButton Name  button  gt        lt ToggleButton Template gt         lt ControlTemplate TargetType  ToggleButton  gt           lt TextBlock gt Click Me Here   lt  TextBlock gt         lt  ControlTemplate gt             lt  ToggleButton Template gt     lt  ToggleButton gt     lt Popup IsOpen   Binding IsChecked  ElementName button   StaysOpen  False  gt       lt Border Background  LightYellow  gt         lt TextBlock gt I m the popup lt  TextBlock gt       lt  Border gt     lt  Popup gt     lt  StackPanel gt

User · Answer

I had some issues with the MouseDown part of this  but here is some code that might get your started    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Window1  Height  300  Width  300  gt       lt Grid gt           lt Control VerticalAlignment  Top  gt               lt Control Template gt                   lt ControlTemplate gt                       lt StackPanel gt                       lt TextBox x Name  MyText  gt  lt  TextBox gt                       lt Popup x Name  Popup  PopupAnimation  Fade  VerticalAlignment  Top  gt                           lt Border Background  Red  gt                               lt TextBlock gt Test Popup Content lt  TextBlock gt                           lt  Border gt                       lt  Popup gt                       lt  StackPanel gt                       lt ControlTemplate Triggers gt                           lt EventTrigger RoutedEvent  UIElement MouseEnter  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  True   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                           lt EventTrigger RoutedEvent  UIElement MouseLeave  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  False   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                       lt  ControlTemplate Triggers gt                   lt  ControlTemplate gt               lt  Control Template gt           lt  Control gt       lt  Grid gt   lt  Window gt

User · Answer

The following approach is the same as Helge Klein s  except that the popup closes automatically when you click anywhere outside the Popup  including the ToggleButton itself     lt ToggleButton x Name  Btn  IsHitTestVisible   Binding ElementName Popup  Path IsOpen  Mode OneWay  Converter  local BoolInverter    gt       lt TextBlock Text  Click here for popup    gt   lt  ToggleButton gt    lt Popup IsOpen   Binding IsChecked  ElementName Btn   x Name  Popup  StaysOpen  False  gt       lt Border BorderBrush  Black  BorderThickness  1  Background  LightYellow  gt           lt CheckBox Content  This is a popup   gt       lt  Border gt   lt  Popup gt     BoolInverter  is used in the IsHitTestVisible binding so that when you click the ToggleButton again  the popup closes     public class BoolInverter   MarkupExtension  IValueConverter       public override object ProvideValue IServiceProvider serviceProvider                return this             public object Convert object value  Type targetType  object parameter  CultureInfo culture                if  value is bool              return   bool value          return value            public object ConvertBack object value  Type targetType  object parameter  CultureInfo culture                return Convert value  targetType  parameter  culture                which shows the handy technique of combining IValueConverter and MarkupExtension in one   I did discover one problem with this technique  WPF is buggy when two popups are on the screen at the same time  Specifically  if your toggle button is on the  overflow popup  in a toolbar  then there will be two popups open after you click it  You may then find that the second popup  your popup  will stay open when you click anywhere else on your window  At that point  closing the popup is difficult  The user cannot click the ToggleButton again to close the popup because IsHitTestVisible is false because the popup is open  In my app I had to use a few hacks to mitigate this problem  such as the following test on the main window  which says  in the voice of Louis Black   if the popup is open and the user clicks somewhere outside the popup  close the friggin  popup     PreviewMouseDown     s  e    gt        if  Popup IsOpen                Point p   e GetPosition Popup Child           if   IsInRange p X  0    FrameworkElement Popup Child  ActualWidth                  IsInRange p Y  0    FrameworkElement Popup Child  ActualHeight               Popup IsOpen   false              Elsewhere    public static bool IsInRange int num  int lo  int hi    gt       num  gt   lo  amp  amp  num  lt   hi

User · Answer

The following uses EventTrigger to show the Popup  This means we don t need a ToggleButton for state binding  In this example the Click event of a Button is used  You can adapt it to use another element event combination    lt Button x Name  OpenPopup  gt Popup      lt Button Triggers gt           lt EventTrigger RoutedEvent  Button Click  gt               lt EventTrigger Actions gt                   lt BeginStoryboard gt                       lt Storyboard gt                           lt BooleanAnimationUsingKeyFrames                                   Storyboard TargetName  ContextPopup                                    Storyboard TargetProperty  IsOpen  gt                               lt DiscreteBooleanKeyFrame KeyTime  0 0 0  Value  True    gt                           lt  BooleanAnimationUsingKeyFrames gt                       lt  Storyboard gt                   lt  BeginStoryboard gt               lt  EventTrigger Actions gt           lt  EventTrigger gt       lt  Button Triggers gt   lt  Button gt   lt Popup x Name  ContextPopup         PlacementTarget   Binding ElementName OpenPopup          StaysOpen  False  gt       lt Label gt Popupcontent    lt  Label gt   lt  Popup gt    Please note that the Popup is referencing the Button by name and vice versa  So x Name       is required on both  the Popup and the Button   It can actually be further simplified by replacing the Storyboard stuff with a custom SetProperty EventTrigger Action described in this SO Answer

User · Answer

I did something simple  but it works   I used a typical ToggleButton  which I restyled as a textblock by changing its control template   Then I just bound the IsChecked property on the ToggleButton to the IsOpen property on the popup   Popup has some properties like StaysOpen that let you modify the closing behavior   The following works in XamlPad     lt StackPanel gt     lt ToggleButton Name  button  gt        lt ToggleButton Template gt         lt ControlTemplate TargetType  ToggleButton  gt           lt TextBlock gt Click Me Here   lt  TextBlock gt         lt  ControlTemplate gt             lt  ToggleButton Template gt     lt  ToggleButton gt     lt Popup IsOpen   Binding IsChecked  ElementName button   StaysOpen  False  gt       lt Border Background  LightYellow  gt         lt TextBlock gt I m the popup lt  TextBlock gt       lt  Border gt     lt  Popup gt     lt  StackPanel gt

User · Answer

The following approach is the same as Helge Klein s  except that the popup closes automatically when you click anywhere outside the Popup  including the ToggleButton itself     lt ToggleButton x Name  Btn  IsHitTestVisible   Binding ElementName Popup  Path IsOpen  Mode OneWay  Converter  local BoolInverter    gt       lt TextBlock Text  Click here for popup    gt   lt  ToggleButton gt    lt Popup IsOpen   Binding IsChecked  ElementName Btn   x Name  Popup  StaysOpen  False  gt       lt Border BorderBrush  Black  BorderThickness  1  Background  LightYellow  gt           lt CheckBox Content  This is a popup   gt       lt  Border gt   lt  Popup gt     BoolInverter  is used in the IsHitTestVisible binding so that when you click the ToggleButton again  the popup closes     public class BoolInverter   MarkupExtension  IValueConverter       public override object ProvideValue IServiceProvider serviceProvider                return this             public object Convert object value  Type targetType  object parameter  CultureInfo culture                if  value is bool              return   bool value          return value            public object ConvertBack object value  Type targetType  object parameter  CultureInfo culture                return Convert value  targetType  parameter  culture                which shows the handy technique of combining IValueConverter and MarkupExtension in one   I did discover one problem with this technique  WPF is buggy when two popups are on the screen at the same time  Specifically  if your toggle button is on the  overflow popup  in a toolbar  then there will be two popups open after you click it  You may then find that the second popup  your popup  will stay open when you click anywhere else on your window  At that point  closing the popup is difficult  The user cannot click the ToggleButton again to close the popup because IsHitTestVisible is false because the popup is open  In my app I had to use a few hacks to mitigate this problem  such as the following test on the main window  which says  in the voice of Louis Black   if the popup is open and the user clicks somewhere outside the popup  close the friggin  popup     PreviewMouseDown     s  e    gt        if  Popup IsOpen                Point p   e GetPosition Popup Child           if   IsInRange p X  0    FrameworkElement Popup Child  ActualWidth                  IsInRange p Y  0    FrameworkElement Popup Child  ActualHeight               Popup IsOpen   false              Elsewhere    public static bool IsInRange int num  int lo  int hi    gt       num  gt   lo  amp  amp  num  lt   hi

User · Answer

I had some issues with the MouseDown part of this  but here is some code that might get your started    lt Window x Class  WpfApplication1 Window1      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml      Title  Window1  Height  300  Width  300  gt       lt Grid gt           lt Control VerticalAlignment  Top  gt               lt Control Template gt                   lt ControlTemplate gt                       lt StackPanel gt                       lt TextBox x Name  MyText  gt  lt  TextBox gt                       lt Popup x Name  Popup  PopupAnimation  Fade  VerticalAlignment  Top  gt                           lt Border Background  Red  gt                               lt TextBlock gt Test Popup Content lt  TextBlock gt                           lt  Border gt                       lt  Popup gt                       lt  StackPanel gt                       lt ControlTemplate Triggers gt                           lt EventTrigger RoutedEvent  UIElement MouseEnter  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  True   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                           lt EventTrigger RoutedEvent  UIElement MouseLeave  SourceName  MyText  gt                               lt BeginStoryboard gt                                   lt Storyboard gt                                       lt BooleanAnimationUsingKeyFrames Storyboard TargetName  Popup  Storyboard TargetProperty   Popup IsOpen   gt                                           lt DiscreteBooleanKeyFrame KeyTime  00 00 00  Value  False   gt                                       lt  BooleanAnimationUsingKeyFrames gt                                   lt  Storyboard gt                               lt  BeginStoryboard gt                           lt  EventTrigger gt                       lt  ControlTemplate Triggers gt                   lt  ControlTemplate gt               lt  Control Template gt           lt  Control gt       lt  Grid gt   lt  Window gt

User · Answer

I did something simple  but it works   I used a typical ToggleButton  which I restyled as a textblock by changing its control template   Then I just bound the IsChecked property on the ToggleButton to the IsOpen property on the popup   Popup has some properties like StaysOpen that let you modify the closing behavior   The following works in XamlPad     lt StackPanel gt     lt ToggleButton Name  button  gt        lt ToggleButton Template gt         lt ControlTemplate TargetType  ToggleButton  gt           lt TextBlock gt Click Me Here   lt  TextBlock gt         lt  ControlTemplate gt             lt  ToggleButton Template gt     lt  ToggleButton gt     lt Popup IsOpen   Binding IsChecked  ElementName button   StaysOpen  False  gt       lt Border Background  LightYellow  gt         lt TextBlock gt I m the popup lt  TextBlock gt       lt  Border gt     lt  Popup gt     lt  StackPanel gt

[wpf] How to open a WPF Popup when another control is clicked, using XAML markup only?

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[wpf] How to open a WPF Popup when another control is clicked, using XAML markup only?

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