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  1. Qt
  2. QTBUG-103604

TapHandler and DragHandler are broken inside Control

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    • Linux/X11

      When inside a Control, TapHandler will detect press and release but will not emit any tap related event.

      The DragHandler will detect a drag but active leep oscillating between true and false.

      Sample code:

      import QtQml
import QtQuick
import QtQuick.Controls
import QtQuick.Layouts

Control {
    height: 40
    background: Rectangle {
        color: 'red'
    }

    contentItem: RowLayout {
        height: 40
        spacing: 50

        Control {
            id: control
            height:40
            implicitWidth: 50
            Layout.fillWidth: true
            Layout.fillHeight: true
            contentItem: Item {}
            background: Rectangle { color: 'blue' }
            color: 'yellow'

            TapHandler {
                acceptedButtons: Qt.LeftButton
                onSingleTapped: (eventPoint) => { console.log('single tapped left'); }
                onTapped: (eventPoint) => { console.log('tapped left'); }
                onPressedChanged: console.log("pressed left " + pressed + tapCount)
            }

            DragHandler {
                onActiveChanged: console.log("drag active: " + active)
                target: null
            }
        }

        Label {
            id: label
            width: 100
            Layout.fillWidth: true
            Layout.fillHeight: true
            text: "bar"
            background: Rectangle { color: 'green' }

            TapHandler {
                acceptedButtons: Qt.LeftButton
                onSingleTapped: (eventPoint) => { console.log('single tapped left'); }
                onTapped: (eventPoint) => { console.log('tapped left'); }
                onPressedChanged: console.log("pressed left " + pressed + tapCount)
            }

            DragHandler {
                onActiveChanged: console.log("drag active: " + active)
                target: null
            }
        }

    }
}

      Expected bahviour

      When interecting with label we have the expected behaviour.
      When clicking the logs are:

      qml: pressed left true0
qml: tapped left
qml: single tapped left
qml: pressed left false1

      When dragging on the label the logs are:

      qml: pressed left true1
qml: drag active: true
qml: pressed left false1
qml: drag active: false

      Observed behaviour

      However, on control we have, for a click:

      qml: pressed left true0
qml: pressed left false0

      The tap signals are not emitted.

      for a drag:

      qml: pressed left true0
qml: drag active: true
qml: pressed left false0
qml: drag active: false
qml: drag active: true
qml: drag active: false
qml: drag active: true
qml: drag active: false
qml: drag active: true
qml: drag active: false
qml: drag active: true
qml: drag active: false
qml: drag active: true
qml: drag active: false
qml: drag active: true
qml: drag active: false
qml: drag active: true
qml: drag active: false

      The drag "restarts".

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            qt.team.quick.subscriptions Qt Quick and Widgets Team
            bterrier Benjamin Terrier
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              Created:
              Updated:

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