diff options
Diffstat (limited to 'src/corelib')
| -rw-r--r-- | src/corelib/animation/qvariantanimation.cpp | 6 | ||||
| -rw-r--r-- | src/corelib/doc/src/animation.qdoc | 11 |
2 files changed, 8 insertions, 9 deletions
diff --git a/src/corelib/animation/qvariantanimation.cpp b/src/corelib/animation/qvariantanimation.cpp index 1322b8c810..d2545bfb88 100644 --- a/src/corelib/animation/qvariantanimation.cpp +++ b/src/corelib/animation/qvariantanimation.cpp @@ -48,15 +48,13 @@ QT_BEGIN_NAMESPACE \class QVariantAnimation \inmodule QtCore \ingroup animation - \brief The QVariantAnimation class provides an abstract base class for animations. + \brief The QVariantAnimation class provides a base class for animations. \since 4.6 This class is part of \l{The Animation Framework}. It serves as a base class for property and item animations, with functions for shared functionality. - QVariantAnimation cannot be used directly as it is an abstract - class; it has a pure virtual method called updateCurrentValue(). The class performs interpolation over \l{QVariant}s, but leaves using the interpolated values to its subclasses. Currently, Qt provides QPropertyAnimation, which @@ -69,7 +67,7 @@ QT_BEGIN_NAMESPACE start the animation. QVariantAnimation will interpolate the property of the target object and emit valueChanged(). To react to a change in the current value you have to reimplement the - updateCurrentValue() virtual function. + updateCurrentValue() virtual function or connect to said signal. It is also possible to set values at specified steps situated between the start and end value. The interpolation will then diff --git a/src/corelib/doc/src/animation.qdoc b/src/corelib/doc/src/animation.qdoc index e5e67cf503..304eb9d112 100644 --- a/src/corelib/doc/src/animation.qdoc +++ b/src/corelib/doc/src/animation.qdoc @@ -118,11 +118,12 @@ \section1 Animating Qt Properties - As mentioned in the previous section, the QPropertyAnimation class - can interpolate over Qt properties. It is this class that should - be used for animation of values; in fact, its superclass, - QVariantAnimation, is an abstract class, and cannot be used - directly. + As mentioned in the previous section, the QPropertyAnimation class can + interpolate over Qt properties. It is often this class that should be used + for animation of values; in fact, its superclass, QVariantAnimation, has an + empty implementation of \l{QAbstractAnimation::}{updateCurrentValue()}, and + does not change any value unless we change it ourselves on the + \l{QVariantAnimation::valueChanged()}{valueChanged signal}. A major reason we chose to animate Qt properties is that it presents us with freedom to animate already existing classes in |