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/***************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (directui@nokia.com)
**
** This file is part of libmeegotouch.
**
** If you have questions regarding the use of this file, please contact
** Nokia at directui@nokia.com.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation
** and appearing in the file LICENSE.LGPL included in the packaging
** of this file.
**
****************************************************************************/
#include "mtextmagnifier.h"
#include "mdebug.h"
#include <QBitmap>
#include <QGraphicsItem>
#include <QGraphicsSceneResizeEvent>
#include <QPainter>
#include <QStyleOptionGraphicsItem>
MTextMagnifier::MTextMagnifier(const QGraphicsItem &sourceItem)
: MStylableWidget(0),
sourceItem(sourceItem)
{
setParentItem(&overlay);
}
MTextMagnifier::~MTextMagnifier()
{
// Before destroying parent, detach so it doesn't try to destroy us.
setParentItem(0);
}
void MTextMagnifier::appear()
{
// Appear in the scene of the source item.
overlay.appear(sourceItem.scene());
overlay.grabGesture(Qt::PanGesture);
}
void MTextMagnifier::disappear()
{
overlay.ungrabGesture(Qt::PanGesture);
overlay.disappear();
}
void MTextMagnifier::setMagnifiedPosition(const QPointF &sourceItemPos)
{
setPos(sourceItem.mapToItem(parentItem(), sourceItemPos));
}
bool MTextMagnifier::isAppeared() const
{
return overlay.isAppeared();
}
void MTextMagnifier::drawContents(QPainter *painter,
const QStyleOptionGraphicsItem *option) const
{
if (offscreenSurface.isNull()) {
mWarning("MTextMagnifier") << "Offscreen surface not created!";
return;
}
const qreal scaleFactor = 1.0 + style()->magnification();
// Source rectangle in local item coordinates.
const QSizeF sourceSize(size() / scaleFactor);
const QRectF sourceRect(QPointF(-sourceSize.width() / 2.0,
-sourceSize.height() / 2.0),
sourceSize);
// Source rectangle in source item coordinates.
const QRectF sourceItemRect(mapRectToItem(&sourceItem, sourceRect));
// Paint sourceItem onto offscreen surface.
offscreenSurface->fill(Qt::transparent);
QPainter offscreenPainter(offscreenSurface.data());
// SmoothPixmapTransform is to draw text edit borders smoothly.
offscreenPainter.setRenderHint(QPainter::SmoothPixmapTransform, true);
// Scale and then translate in scaled coordinates.
offscreenPainter.scale(scaleFactor, scaleFactor);
offscreenPainter.translate(-sourceItemRect.topLeft());
QStyleOptionGraphicsItem sourceItemOption = *option;
sourceItemOption.exposedRect = sourceItemRect;
offscreenPainter.setCompositionMode(QPainter::CompositionMode_Source);
const_cast<QGraphicsItem *>(&sourceItem)->paint(&offscreenPainter, &sourceItemOption);
offscreenPainter.resetTransform();
if (style()->magnifierMask()) {
offscreenPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
offscreenPainter.drawPixmap(offscreenSurface->rect(), *style()->magnifierMask());
}
if (style()->magnifierFrame()) {
offscreenPainter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
offscreenPainter.drawPixmap(offscreenSurface->rect(), *style()->magnifierFrame());
}
offscreenPainter.end();
// Paint the result to screen
painter->save();
painter->setClipRect(boundingRect(), Qt::IntersectClip);
painter->drawPixmap(boundingRect().toRect(), *offscreenSurface);
painter->restore();
}
void MTextMagnifier::applyStyle()
{
if (!style()->magnifierFrame()) {
return;
}
// Update bounding rectangle.
prepareGeometryChange();
QSize magnifierSize(style()->magnifierFrame()->size());
if (!magnifierSize.isEmpty()) {
resize(magnifierSize);
}
}
void MTextMagnifier::resizeEvent(QGraphicsSceneResizeEvent *event)
{
// The size should always be integers already,
// therefore safe to round.
prepareOffscreenSurface(event->newSize().toSize());
}
QRectF MTextMagnifier::boundingRect() const
{
// Put origo to center and apply offset from style.
return QRectF(-rect().center() + style()->visualOffset(), size());
}
void MTextMagnifier::prepareOffscreenSurface(const QSize &size)
{
if (size.isEmpty()
|| (offscreenSurface && offscreenSurface->size() == size)) {
return;
}
offscreenSurface.reset(new QPixmap(size));
}
// Magnifier overlay widget
MagnifierOverlay::MagnifierOverlay()
{
setFlag(QGraphicsItem::ItemHasNoContents, true);
// Occupy whole screen to be able to catch panning gestures. The size does not really matter
// as long as it covers whole screen in portrait and landscape.
setManagedManually(true);
const QSizeF visibleSceneSize = sceneManager()->visibleSceneSize(M::Landscape);
const qreal size = qMax<qreal>(visibleSceneSize.width(), visibleSceneSize.height());
setPreferredSize(size, size);
}
bool MagnifierOverlay::isAppeared() const
{
return sceneWindowState() != MSceneWindow::Disappeared;
}
void MagnifierOverlay::panGestureEvent(QGestureEvent *event, QPanGesture *panGesture)
{
// Accept gesture if magnifier is appeared. This is done to prevent panning of
// application page but will of course prevent other uses of pan gestures as well.
if (panGesture->state() == Qt::GestureStarted
&& isAppeared()) {
event->accept(panGesture);
} else {
event->ignore(panGesture);
}
}
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