The QAnimationGroup class is an abstract base class for groups of animations. 更多...
| 头： | #include <QAnimationGroup> |
| qmake: | QT += core |
| Since: | Qt 4.6 |
| 继承： | QAbstractAnimation |
| 继承者： | QParallelAnimationGroup and QSequentialAnimationGroup |
| QAnimationGroup (QObject * parent = nullptr) | |
| virtual | ~QAnimationGroup () |
| void | addAnimation (QAbstractAnimation * animation ) |
| QAbstractAnimation * | animationAt (int index ) const |
| int | animationCount () const |
| void | clear () |
| int | indexOfAnimation (QAbstractAnimation * animation ) const |
| void | insertAnimation (int index , QAbstractAnimation * animation ) |
| void | removeAnimation (QAbstractAnimation * animation ) |
| QAbstractAnimation * | takeAnimation (int index ) |
| const QMetaObject | staticMetaObject |
| virtual bool | event (QEvent * event ) override |
The QAnimationGroup class is an abstract base class for groups of animations.
An animation group is a container for animations (subclasses of QAbstractAnimation ). A group is usually responsible for managing the state of its animations, i.e., it decides when to start, stop, resume, and pause them. Currently, Qt provides two such groups: QParallelAnimationGroup and QSequentialAnimationGroup . Look up their class descriptions for details.
由于 QAnimationGroup 继承自 QAbstractAnimation , you can combine groups, and easily construct complex animation graphs. You can query QAbstractAnimation for the group it belongs to (using the group() 函数)。
To start a top-level animation group, you simply use the start() function from QAbstractAnimation . By a top-level animation group, we think of a group that itself is not contained within another group. Starting sub groups directly is not supported, and may lead to unexpected behavior.
QAnimationGroup provides methods for adding and retrieving animations. Besides that, you can remove animations by calling removeAnimation (), and clear the animation group by calling clear (). You may keep track of changes in the group's animations by listening to QEvent::ChildAdded and QEvent::ChildRemoved 事件。
QAnimationGroup takes ownership of the animations it manages, and ensures that they are deleted when the animation group is deleted.
另请参阅 QAbstractAnimation , QVariantAnimation ，和 动画框架 .
构造 QAnimationGroup . parent 会被传递给 QObject 的构造函数。
[虚拟]
QAnimationGroup::
~QAnimationGroup
()
Destroys the animation group. It will also destroy all its animations.
添加 animation to this group. This will call insertAnimation with index equals to animationCount ().
注意： The group takes ownership of the animation.
另请参阅 removeAnimation ().
Returns a pointer to the animation at index in this group. This function is useful when you need access to a particular animation. index is between 0 and animationCount () - 1.
另请参阅 animationCount () 和 indexOfAnimation ().
Returns the number of animations managed by this group.
另请参阅 indexOfAnimation (), addAnimation ()，和 animationAt ().
Removes and deletes all animations in this animation group, and resets the current time to 0.
另请参阅 addAnimation () 和 removeAnimation ().
[override virtual protected]
bool
QAnimationGroup::
event
(
QEvent
*
event
)
重实现自 QAbstractAnimation::event ().
返回索引对于 animation . The returned index can be passed to the other functions that take an index as an argument.
另请参阅 insertAnimation (), animationAt ()，和 takeAnimation ().
插入 animation into this animation group at index 。若 index is 0 the animation is inserted at the beginning. If index is animationCount (), the animation is inserted at the end.
注意： The group takes ownership of the animation.
另请参阅 takeAnimation (), addAnimation (), indexOfAnimation ()，和 removeAnimation ().
移除 animation from this group. The ownership of animation is transferred to the caller.
另请参阅 takeAnimation (), insertAnimation ()，和 addAnimation ().
Returns the animation at index and removes it from the animation group.
注意： The ownership of the animation is transferred to the caller.
另请参阅 removeAnimation (), addAnimation (), insertAnimation ()，和 indexOfAnimation ().