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  1. Qt
  2. QTBUG-64491

need to be able to add PointerHandlers to conventional event-handling Items

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    • 6eaa95662c2d4ba287ac5d1de5ec49bd3a9f59e6

    Description

      For example, let's make a Button draggable:

      import QtQuick 2.0
import Qt.labs.handlers 1.0
import QtQuick.Controls 2.2

ApplicationWindow {
    visible: true
    width: 200; height: 200
    CheckBox {
        id: draggableCB
        anchors.right: parent.right
        text: "draggable"
        checked: true
    }

    Button {
        width: 100; height: 50
        text: "Drag me"
        onClicked: console.log("clicked")
        DragHandler { enabled: draggableCB.checked }
    }
}

      It should be possible to tap the button as usual, such that it looks visually pressed when it's pressed, and emits its clicked signal on release. It should be possible to drag it. And as soon as the DragHandler takes over the exclusive grab and becomes active, the Button should no longer be pressed. We've seen several possible bugs with this already, depending on which patches we've been trying out in qtdeclarative: the Button can't be dragged at all; the Button can be dragged but can't be pressed at all; the Button is pressed and can be dragged but stays pressed even after the point is released; it works right for touch but not for mouse; vice-versa; etc.

      But this is not the only scenario. Hopefully most of the ones we can think of can be fixed during the course of the 5.10 releases.

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          depends on

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-84231 TapHandler in parent of an event-handling Item always declines the press event

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-71218 DragHandler in a Controls 2 Button: button stays in pressed state after drag begins

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-73262 it's confusing that TapHandler.gesturePolicy affects event propagation

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-103604 TapHandler and DragHandler are broken inside Control

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
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              srutledg Shawn Rutledge
              srutledg Shawn Rutledge
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                Created:
                Updated:

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