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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: qt-info@nokia.com
**
** This software, including documentation, is protected by copyright
** controlled by Nokia Corporation. You may use this software in
** accordance with the terms and conditions contained in the Qt Phone
** Demo License Agreement.
**
****************************************************************************/
#include <QState>
#include <QStateMachine>
#include <QSignalTransition>
#include <QPropertyAnimation>
#include <QParallelAnimationGroup>
#include <QGraphicsSceneMouseEvent>
#include "dataresource.h"
#include "draggablepreview.h"
#define SCALED_POS(sw, sh, scale) \
QPointF(qRound(sw * 0.5 - (sw * 0.5 + m_leftMargin) * scale), \
qRound(sh - (sh + m_topMargin) * 0.5 * scale))
DraggablePreview::DraggablePreview(QGraphicsWidget *item, const QSize &screenSize,
QGraphicsItem *parent)
: QGraphicsWidget(parent),
m_item(item),
m_screenSize(screenSize),
m_border(Resource::intValue("draggable-preview/border")),
m_topMargin(Resource::intValue("draggable-preview/margin-top")),
m_leftMargin(Resource::intValue("draggable-preview/margin-left")),
m_maximizeRange(Resource::doubleValue("draggable-preview/maximize-range")),
m_minimumOffset(Resource::intValue("draggable-preview/minimum-offset"))
{
setFlag(QGraphicsItem::ItemHasNoContents);
setupInterface();
}
void DraggablePreview::setupInterface()
{
// add background item
QPixmap backgroundPixmap = Resource::pixmap("screen_unlock.png");
m_background = new QGraphicsPixmapItem(backgroundPixmap, this);
m_background->setPos(0, 0);
m_background->setFlag(QGraphicsItem::ItemStacksBehindParent);
m_background->setShapeMode(QGraphicsPixmapItem::BoundingRectShape);
// add embedded widget
m_item->setParentItem(this);
m_item->setFlag(QGraphicsItem::ItemStacksBehindParent);
m_item->setPos(m_leftMargin + m_border, m_topMargin + m_border);
m_item->resize(m_screenSize);
// resize to the background size
resize(backgroundPixmap.size());
const int sw = m_screenSize.width();
const int sh = m_screenSize.height();
qreal minimumScale = Resource::doubleValue("draggable-preview/minimum-scale");
qreal draggableScale = Resource::doubleValue("draggable-preview/first-zoom-scale");
m_draggablePos = SCALED_POS(sw, sh, draggableScale);
QPointF minimumPos(SCALED_POS(sw, sh, minimumScale));
QPointF maximumPos(-m_leftMargin - m_border, -m_topMargin - m_border);
m_maximumOffset = minimumPos.y();
QStateMachine *machine = new QStateMachine(this);
m_minimizedState = new QState();
m_minimizedState->assignProperty(this, "pos", minimumPos);
m_minimizedState->assignProperty(this, "scale", minimumScale);
m_draggableState = new QState();
m_draggableState->assignProperty(this, "pos", m_draggablePos);
m_draggableState->assignProperty(this, "scale", draggableScale);
m_maximizedState = new QState();
m_maximizedState->assignProperty(this, "pos", maximumPos);
m_maximizedState->assignProperty(this, "scale", 1.0);
int restoreTime = Resource::intValue("draggable-preview/restore-time");
int maximizeTime = Resource::intValue("draggable-preview/maximize-time");
int firstZoomTime = Resource::intValue("draggable-preview/first-zoom-time");
QSignalTransition *transition;
// create minimized > draggable state transition
transition = m_minimizedState->addTransition(this, SIGNAL(draggableStarted()),
m_draggableState);
transition->addAnimation(createAnimation(firstZoomTime));
// create draggable > minimized state transition
transition = m_draggableState->addTransition(this, SIGNAL(minimizeStarted()),
m_minimizedState);
transition->addAnimation(createAnimation(restoreTime));
// create draggable > maximized state transition
transition = m_draggableState->addTransition(this, SIGNAL(maximizeStarted()),
m_maximizedState);
transition->addAnimation(createAnimation(maximizeTime,
SLOT(onMaximizeFinished())));
// this is used just to update the final value when still animating
transition = m_draggableState->addTransition(this, SIGNAL(draggableUpdate()),
m_draggableState);
transition->addAnimation(createAnimation(0));
// add states
machine->addState(m_minimizedState);
machine->addState(m_draggableState);
machine->addState(m_maximizedState);
setPos(minimumPos);
setScale(minimumScale);
machine->setInitialState(m_minimizedState);
machine->start();
}
QAbstractAnimation *DraggablePreview::createAnimation(int time, const char *slot)
{
QParallelAnimationGroup *result = new QParallelAnimationGroup();
QPropertyAnimation *posAnimation = new QPropertyAnimation(this, "pos");
posAnimation->setEasingCurve(QEasingCurve::InSine);
posAnimation->setDuration(time);
QPropertyAnimation *scaleAnimation = new QPropertyAnimation(this, "scale");
scaleAnimation->setEasingCurve(QEasingCurve::InSine);
scaleAnimation->setDuration(time);
result->addAnimation(posAnimation);
result->addAnimation(scaleAnimation);
if (slot)
connect(result, SIGNAL(finished()), slot);
return result;
}
void DraggablePreview::onMaximizeFinished()
{
// hide background
m_background->hide();
// move menu to front to not block events
m_item->setFlag(QGraphicsItem::ItemStacksBehindParent, false);
emit maximizeFinished();
// detach from parent to avoid inherit transformations
m_item->setParentItem(0);
m_item->setPos(0, 0);
}
void DraggablePreview::mousePressEvent(QGraphicsSceneMouseEvent *e)
{
m_lastPos = e->scenePos();
m_draggableState->assignProperty(this, "pos", m_draggablePos);
emit draggableStarted();
}
void DraggablePreview::mouseMoveEvent(QGraphicsSceneMouseEvent *e)
{
const int offset = qRound(pos().y() + e->scenePos().y() - m_lastPos.y());
m_lastPos = e->scenePos();
const int fy = qBound(m_minimumOffset, offset, m_maximumOffset);
if (fy < m_draggablePos.y()) {
m_draggableState->assignProperty(this, "pos",
QPointF(m_draggablePos.x(), fy));
emit draggableUpdate();
}
}
void DraggablePreview::mouseReleaseEvent(QGraphicsSceneMouseEvent *)
{
if (pos().y() < m_minimumOffset + m_maximizeRange)
emit maximizeStarted();
else
emit minimizeStarted();
}
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