plasma-framework/layouts/layoutanimator.h

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/*
Copyright 2007 by Robert Knight <robertknight@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
#ifndef __LAYOUTANIMATOR__
#define __LAYOUTANIMATOR__
#include <QtCore/QRectF>
#include <QtCore/QObject>
#include <plasma/plasma_export.h>
class QTimeLine;
namespace Plasma
{
class Layout;
class LayoutItem;
/**
* LayoutAnimator can be used to animate changes
* in Layouts.
*
* @code
*
* LayoutAnimator* animator = new LayoutAnimator;
* QTimeLine* timeLine = new QTimeLine;
*
* animator->setTimeLine(timeLine);
* animator->setEffect( LayoutAnimator::InsertedState , LayoutAnimator::FadeInMoveEffect );
* animator->setEffect( LayoutAnimator::StandardState , LayoutAnimator::MoveEffect );
* animator->setEffect( LayoutAnimator::RemovedState , LayoutAnimator::FadeOutMoveEffect );
* myLayout->setAnimator(animator);
*
* @endcode
*/
class PLASMA_EXPORT LayoutAnimator : public QObject
{
Q_OBJECT
public:
/** Constructs a new layout animator with the specified parent. */
explicit LayoutAnimator(QObject* parent = 0);
~LayoutAnimator();
/**
* This enum describes the possible states which a layout item may be in.
* Different effects can be defined for items which are being inserted,
* moved or resized or removed from layouts.
*/
enum State
{
/**
* State for an item which has recently been added to a layout.
* When the animation completes, the item's state will change to
* StandardState
*/
InsertedState,
/**
* Normal state for items in the layout.
* Items will remain in this state until it is explicitly changed
* via setCurrentState()
*/
StandardState,
/**
* State for an item which is currently being removed from a layout.
* When the animation completes, the item will be removed from the
* animator and its state will be undefined.
*/
RemovedState,
/**
* State for an item whoose geometry is not managed by the animator.
*
* All LayoutItems are initially in this state and are moved into a
* different state ( usually InsertedState ) by calling
* setCurrentState( item , state )
*
* An item transitions into this state when the animation completes
* whilst the item is in RemovedState
*/
DeadState
};
/**
* This enum describes the available effects which can be used
* to animate changes in a layout.
*/
enum Effect
{
/**
* No effect. When the animation begins, the item immediately appears
* in its final position and size.
*/
NoEffect,
/**
* The item is smoothly moved and resized from its initial geometry to its final
* geometry as the animation progresses.
*/
MoveEffect,
/**
* The item fades out during the first half of the animation in its initial geometry
* and then fades in at its final position and size during the second half of
* the animation.
*/
FadeEffect,
/**
* The item is initially invisible and fades in whilst moving and resizing to
* its final position as the animation progresses.
*/
FadeInMoveEffect,
/**
* The item is initially fully opqaue and fades out whilst moving and resizing
* to its final position as the animation progresses.
*/
FadeOutMoveEffect
};
/**
* Sets the @p effect for items in the layout which are under-going a change
* specified by @p action.
*
* This allows different effects to be defined for items which are being added to,
* removed from, or repositioned inside layouts.
*/
void setEffect( State state , int effect );
/** See setEffect() */
int effect( State state ) const;
/**
* Sets the current action for a particular layout item. The Layout class
* should call this before changing an item so that the animator can apply the correct
* animation.
*
* When the current animation completes, depending on the current @p state, the item
* may advance into a new state.
*/
void setCurrentState( LayoutItem* item , State state );
/** See setCurrentState() */
State state( LayoutItem* item ) const;
/**
* Sets the new geometry for a layout item.
* The item will animate from its current geometry to @p geometry, using
* the effect specified in setEffect() for the state currently associated
* with @p item
*/
virtual void setGeometry( LayoutItem* item , const QRectF& geometry );
/**
* Sets the time line used by this animator.
*
* The duration of the animation can be changed by altering @p timeLine 's duration
*/
void setTimeLine( QTimeLine* timeLine );
/** Returns the QTimeLine used by this animator. */
QTimeLine* timeLine() const;
/**
* Convenience feature which causes LayoutItems and their associated
* QGraphicsItems to be automatically deleted when their removal
* animation finishes.
*
* The default is false.
*/
void setAutoDeleteOnRemoval(bool autoDelete);
/** See setAutoDeleteOnRemoval() */
bool autoDeleteOnRemoval() const;
Q_SIGNALS:
/** This signal is emitted when the state of an item in the animator changes. */
void stateChanged(Plasma::LayoutItem *item, Plasma::LayoutAnimator::State oldState, Plasma::LayoutAnimator::State newState);
protected:
virtual void updateItem( qreal value , LayoutItem* item );
private Q_SLOTS:
void valueChanged(qreal value);
void animationCompleted();
void itemAutoDeleter(Plasma::LayoutItem *item, Plasma::LayoutAnimator::State oldState, Plasma::LayoutAnimator::State newState);
private:
void moveEffectUpdateItem(qreal value,LayoutItem* item,Effect effect);
void noEffectUpdateItem(qreal value,LayoutItem* item);
void fadeEffectUpdateItem(qreal value,LayoutItem* item);
void animationFinished(LayoutItem* item);
private:
class Private;
Private* const d;
};
}
#endif // __LAYOUTANIMATOR__