Animates changes in parent values. 更多...
导入语句: | import QtQuick 2.2 |
Since: | Qt 5.0 |
继承: | 动画 |
ParentAnimation is used to animate a parent change for an Item .
例如,以下
ParentChange
changes
blueRect
to become a child of
redRect
when it is clicked. The inclusion of the ParentAnimation, which defines a
NumberAnimation
to be applied during the transition, ensures the item animates smoothly as it moves to its new parent:
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 } } transitions: Transition { ParentAnimation { NumberAnimation { properties: "x,y"; duration: 1000 } } } MouseArea { anchors.fill: parent; onClicked: blueRect.state = "reparented" } } }
A ParentAnimation can contain any number of animations. These animations will be run in parallel; to run them sequentially, define them within a SequentialAnimation .
In some cases, such as when reparenting between items with clipping enabled, it is useful to animate the parent change via another item that does not have clipping enabled. Such an item can be set using the 凭借 特性。
ParentAnimation is typically used within a Transition in conjunction with a ParentChange . When used in this manner, it animates any ParentChange that has occurred during the state change. This can be overridden by setting a specific target item using the target 特性。
另请参阅 Qt Quick 中的动画和过渡 and Qt Quick Examples - Animation .
newParent : Item |
The new parent to animate to.
若 ParentAnimation is defined within a Transition , this value defaults to the value defined in the end state of the Transition .
target : Item |
The item to reparent.
When used in a transition, if no target is specified, all ParentChange occurrences are animated by the ParentAnimation .
凭借 : Item |
The item to reparent via. This provides a way to do an unclipped animation when both the old parent and new parent are clipped.
ParentAnimation { target: myItem via: topLevelItem // ... }
注意: This only works when the ParentAnimation is used in a Transition in conjunction with a ParentChange .