ParentChange QML Type | Qt Quick 5.9

Qt 5.9 | Qt Quick | QML Types | ParentChange QML Type

Qt 5.9.4 Reference Documentation

# ParentChange QML Type

Specifies how to reparent an Item in a state change More...

Import Statement: | import QtQuick 2.7

- List of all members, including inherited members

## Properties

- height : real
- parent : Item
- rotation : real
- scale : real
- target : Item
- width : real
- x : real
- y : real

## Detailed Description

ParentChange reparents an item while preserving its visual appearance (position, size, rotation, and scale) on screen. You can then specify a transition to move/resize/rotate/scale the item to its final intended appearance.

ParentChange can only preserve visual appearance if no complex transforms are involved. More specifically, it will not work if the transform property has been set for any items involved in the reparenting (i.e. items in the common ancestor tree for the original and new parent).

The example below displays a large red rectangle and a small blue rectangle, side by side. When the `blueRect` is clicked, it changes to the "reparented" state: its parent is changed to `redRect` and it is positioned at (10, 10) within the red rectangle, as specified in the ParentChange.

      import QtQuick 2.0

      Item {
          width: 200; height: 100

          Rectangle {
              id: redRect
              width: 100; height: 100
              color: "red"
          }

          Rectangle {
              id: blueRect
              x: redRect.width
              width: 50; height: 50
              color: "blue"

              states: State {
                  name: "reparented"
                  ParentChange { target: blueRect; parent: redRect; x: 10; y: 10 }
              }

              MouseArea { anchors.fill: parent; onClicked: blueRect.state = "reparented" }
          }
      }

You can specify at which point in a transition you want a ParentChange to occur by using a ParentAnimation.

Note that unlike PropertyChanges, ParentChange expects an Item-based target; it will not work with arbitrary objects (for example, you couldn't use it to reparent a Timer).

## Property Documentation

height : real

These properties hold the new position, size, scale, and rotation for the item in this state.

parent : Item

This property holds the new parent for the item in this state.

rotation : real

These properties hold the new position, size, scale, and rotation for the item in this state.

scale : real

These properties hold the new position, size, scale, and rotation for the item in this state.

target : Item

This property holds the item to be reparented

width : real

These properties hold the new position, size, scale, and rotation for the item in this state.

x : real

These properties hold the new position, size, scale, and rotation for the item in this state.

y : real

These properties hold the new position, size, scale, and rotation for the item in this state.