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  1. Qt
  2. QTBUG-66113

Nested popups cause Keys.onBackPressed event handler to not be executed

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    • f301decbe39d253cc979774e2f32cde9c1212e4c

    Description

      I have a use case where a popup for entering notes can spawn a sub-popup for grabbing an image via the QML Camera component.

      The nested popups seem to cause Qt/ QML to lose track of my StackView's `Keys.onBackPressed` event listener such that when I go into the nested popup and then come out of both popups, the default Android behavior of exiting the app is performed.

      The below S.S.C.C.E. manifests this behavior:

      import QtQuick 2.9
      import QtQuick.Controls 2.2
      import QtQuick.Dialogs 1.2
      
      ApplicationWindow {
        id: root;
        visible: true
        width:400;
        height:200;
        
        StackView {
          id: stack_view;
          Component.onCompleted: {
            push(_HomeComponent)
          }
          Keys.onBackPressed: {
            console.log('BackPressed intercepted and stopped from quitting the program.');
          }
        }
        
        Component {
          id: _HomeComponent;
          Item {
            Button {
              text: 'open popup';
              onClicked: { 
                popup.visible = true;
                console.log('open popup clicked');
              }
            }
            Popup {
              id: popup
              visible: false;
              parent: ApplicationWindow.contentItem;
              Component {
                id: _PopupContent;
                Rectangle {
                  color: 'grey';
                  width: 150;
                  height: 150;
                  Button {
                    text: 'open nested popup';
                    onClicked: { 
                      nested_popup.visible = true;
                      console.log('open nested popup clicked');
                    }
                  }
                  Popup {
                    id: nested_popup
                    visible: false;
                    parent: ApplicationWindow.contentItem;
                    Component {
                      id: _NestedPopupContent;
                      Rectangle {
                        color: 'red';
                        width: 150;
                        height: 150;
                        Text {text: 'In nested popup'}
                      }
                    }
                    
                    Loader {
                      sourceComponent: nested_popup.visible ? _NestedPopupContent : null;
                    }
                  }
                }
              }
              Loader {
                sourceComponent: popup.visible ? _PopupContent : null;
              }
            }
          }
        }
      }
      
      

      Attached is a gif of the code in action. Blocking if only one popup is gone into and exiting if the nested popup is gone into.

      Attachments

        1. popups.gif
          54 kB
          Ross Rogers
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            ross.rogers Ross Rogers
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            Dates

              Created:
              Updated:
              Resolved:

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