![]() ![]() ![]() setEasingCurve( QEasingCurve ::OutBounce) QPropertyAnimation animation( &button, "geometry") Īnimation. ![]() Notably, the QWidget class (which we can also embed in a QGraphicsView) has properties for its bounds, colors, etc. It is often this class that should be used for animation of values in fact, its superclass, QVariantAnimation, has an empty implementation of updateCurrentValue(), and does not change any value unless we change it ourselves on the valueChanged signal.Ī major reason we chose to animate Qt properties is that it presents us with freedom to animate already existing classes in the Qt API. These classes provide a framework for creating both simple and complex animations.Ībstract base class for groups of animationsĪs mentioned in the previous section, the QPropertyAnimation class can interpolate over Qt properties. We will look more closely at this later.īehind the scenes, the animations are controlled by a global timer, which sends updates to all animations that are playing.įor detailed descriptions of the classes' function and roles in the framework, please look up their class descriptions. A QState can also set properties when the state is entered or exited, and this special animation state will interpolate between these values when given a QPropertyAnimation. The state machine provides a special state that can play an animation. The animation framework can be used on its own, but is also designed to be part of the state machine framework (See the state machine framework for an introduction to the Qt state machine). Note also that the groups are subclasses of QAbstractAnimation, so groups can themselves contain other groups. The tree is built by using QAnimationGroups, which function as containers for other animations. Note that this gives us great freedom in animating already existing widgets and other QObjects.Ĭomplex animations can be constructed by building a tree structure of QAbstractAnimations. So when you want to animate a value, you can declare it as a property and make your class a QObject. The class performs an interpolation over the property using an easing curve. The animation framework further provides the QPropertyAnimation class, which inherits QVariantAnimation and performs animation of a Qt property, which is part of Qt's meta-object system. It is also receives the time change notifications. It represents basic properties that are common for all animations in the framework notably, the ability to start, stop, and pause an animation. QAbstractAnimation is the ancestor of all animations. The animation framework foundation consists of the base class QAbstractAnimation, and its two subclasses QVariantAnimation and QAnimationGroup. The following diagram shows the most important classes in the animation framework. We will in this section take a high-level look at the animation framework's architecture and how it is used to animate Qt properties. We also show examples of the most common techniques that the framework allows for animating QObjects and graphics items. In this overview, we explain the basics of its architecture. ![]() Much of the knowledge acquired about the animation framework can be applied to Qt Quick. Many of the concepts available in the animation framework are also available in Qt Quick, where it offers a declarative way of defining animations. The framework can also be used with the Graphics View framework. By animating Qt properties, the framework provides great freedom for animating widgets and other QObjects. The animation framework aims to provide an easy way for creating animated and smooth GUIs. ![]()
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