指定如何在状态改变时重设项父级。 更多...
导入语句: | import QtQuick 2.2 |
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).
height : real |
rotation : real |
scale : real |
width : real |
x : real |
y : 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.
target : Item |
This property holds the item to be reparented