DragHandler QML Type

Handler for dragging. More...

• List of all members, including inherited members

Properties

• translation : QVector2D
• xAxis
  • xAxis.minimum : real
  • xAxis.maximum : real
  • xAxis.enabled : bool
• yAxis
  • yAxis.minimum : real
  • yAxis.maximum : real
  • yAxis.enabled : bool

Detailed Description

DragHandler is a handler that is used to interactively move an Item. Like other Input Handlers, by default it is fully functional, and manipulates its target.

 import QtQuick 2.12

 Rectangle {
     width: 100
     height: 100
     color: "lightsteelblue"
     DragHandler { }
 }

It has properties to restrict the range of dragging.

If it is declared within one Item but is assigned a different target, then it handles events within the bounds of the parent Item but manipulates the target Item instead:

 import QtQuick 2.12

 Item {
     width: 640
     height: 480

     Rectangle {
         id: feedback
         border.color: "red"
         width: Math.max(10, handler.centroid.ellipseDiameters.width)
         height: Math.max(10, handler.centroid.ellipseDiameters.height)
         radius: Math.max(width, height) / 2
         visible: handler.active
     }

     DragHandler {
         id: handler
         target: feedback
     }
 }

A third way to use it is to set target to null and react to property changes in some other way:

 import QtQuick 2.12

 Item {
     width: 640
     height: 480

     DragHandler {
         id: handler
         target: null
     }

     Text {
         color: handler.active ? "darkgreen" : "black"
         text: handler.centroid.centroid.x.toFixed(1) + "," + handler.centroid.position.y.toFixed(1)
         x: handler.centroid.position.x - width / 2
         y: handler.centroid.position.y - height
     }
 }

If minimumPointCount and maximumPointCount are set to values larger than 1, the user will need to drag that many fingers in the same direction to start dragging. A multi-finger drag gesture can be detected independently of both a (default) single-finger DragHandler and a PinchHandler on the same Item, and thus can be used to adjust some other feature independently of the usual pinch behavior: for example adjust a tilt transformation, or adjust some other numeric value, if the target is set to null. But if the target is an Item, centroid is the point at which the drag begins and to which the target will be moved (subject to constraints).

At this time, drag-and-drop is not yet supported.

See also Drag and MouseArea.

Property Documentation