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Viewing changes to lib/documentview/birdeyeview.cpp

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2011-12-15 14:17:54 UTC
  • mto: This revision was merged to the branch mainline in revision 12.
  • Revision ID: package-import@ubuntu.com-20111215141754-z043hyx69dulbggf
Tags: upstream-4.7.90
Import upstream version 4.7.90

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lib/documentview/birdeyeview.cpp
 
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// vim: set tabstop=4 shiftwidth=4 expandtab:
 
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/*
 
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Gwenview: an image viewer
 
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Copyright 2011 Aurélien Gâteau <agateau@kde.org>
 
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This program is free software; you can redistribute it and/or
 
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modify it under the terms of the GNU General Public License
 
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as published by the Free Software Foundation; either version 2
 
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of the License, or (at your option) any later version.
 
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This program is distributed in the hope that it will be useful,
 
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but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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GNU General Public License for more details.
 
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You should have received a copy of the GNU General Public License
 
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along with this program; if not, write to the Free Software
 
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
 
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*/
 
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// Self
 
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#include "birdeyeview.moc"
 
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// Local
 
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#include <lib/document/document.h>
 
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#include <lib/documentview/documentview.h>
 
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// KDE
 
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#include <kdebug.h>
 
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// Qt
 
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#include <QCursor>
 
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#include <QGraphicsSceneEvent>
 
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#include <QPainter>
 
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namespace Gwenview
 
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{
 
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static qreal MAX_SIZE = 96;
 
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static qreal VIEW_OFFSET = MAX_SIZE / 4;
 
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static qreal Y_POSITION_PERCENT = 1 / 3.;
 
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struct BirdEyeViewPrivate {
 
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    BirdEyeView* q;
 
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    DocumentView* mDocView;
 
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    QRectF mVisibleRect;
 
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    QPointF mLastDragPos;
 
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};
 
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BirdEyeView::BirdEyeView(DocumentView* docView)
 
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: QGraphicsWidget(docView)
 
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, d(new BirdEyeViewPrivate)
 
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{
 
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    setFlag(ItemIsSelectable);
 
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    d->q = this;
 
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    d->mDocView = docView;
 
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    adjustGeometry();
 
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    connect(docView->document().data(), SIGNAL(metaInfoUpdated()), SLOT(adjustGeometry()));
 
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    connect(docView, SIGNAL(zoomChanged(qreal)), SLOT(adjustGeometry()));
 
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    connect(docView, SIGNAL(zoomToFitChanged(bool)), SLOT(adjustGeometry()));
 
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    connect(docView, SIGNAL(positionChanged()), SLOT(adjustVisibleRect()));
 
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}
 
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BirdEyeView::~BirdEyeView()
 
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{
 
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    delete d;
 
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}
 
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void BirdEyeView::adjustGeometry()
 
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{
 
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    if (d->mDocView->zoomToFit()) {
 
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        hide();
 
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        return;
 
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    }
 
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    show();
 
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    QSize size = d->mDocView->document()->size();
 
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    size.scale(MAX_SIZE, MAX_SIZE, Qt::KeepAspectRatio);
 
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    QRectF rect = d->mDocView->boundingRect();
 
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    setGeometry(
 
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        QRectF(
 
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            rect.right() - VIEW_OFFSET - size.width(),
 
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            qMax(rect.top() + rect.height() * Y_POSITION_PERCENT - size.height(), 0.),
 
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            size.width(),
 
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            size.height()
 
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        ));
 
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    adjustVisibleRect();
 
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    setVisible(d->mVisibleRect != boundingRect());
 
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}
 
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void BirdEyeView::adjustVisibleRect()
 
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{
 
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    QSizeF docSize = d->mDocView->document()->size();
 
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    qreal viewZoom = d->mDocView->zoom();
 
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    qreal bevZoom = size().width() / docSize.width();
 
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    if (qFuzzyIsNull(viewZoom) || qFuzzyIsNull(bevZoom)) {
 
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        // Prevent divide-by-zero crashes
 
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        return;
 
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    }
 
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    d->mVisibleRect = QRectF(
 
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                          QPointF(d->mDocView->position()) / viewZoom * bevZoom,
 
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                          (d->mDocView->size() / viewZoom).boundedTo(docSize) * bevZoom);
 
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    update();
 
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}
 
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inline void drawTransparentRect(QPainter* painter, const QRectF& rect, const QColor& color)
 
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{
 
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    QColor bg = color;
 
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    bg.setAlphaF(.33);
 
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    QColor fg = color;
 
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    fg.setAlphaF(.66);
 
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    painter->setPen(fg);
 
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    painter->setBrush(bg);
 
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    painter->drawRect(rect.adjusted(0, 0, -1, -1));
 
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}
 
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void BirdEyeView::paint(QPainter* painter, const QStyleOptionGraphicsItem*, QWidget*)
 
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{
 
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    drawTransparentRect(painter, boundingRect(), Qt::black);
 
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    drawTransparentRect(painter, d->mVisibleRect, Qt::white);
 
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}
 
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void BirdEyeView::mousePressEvent(QGraphicsSceneMouseEvent* event)
 
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{
 
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    if (d->mVisibleRect.contains(event->pos())) {
 
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        setCursor(Qt::ClosedHandCursor);
 
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        d->mLastDragPos = event->pos();
 
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    }
 
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}
 
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void BirdEyeView::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
 
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{
 
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    QGraphicsItem::mouseMoveEvent(event);
 
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    if (d->mLastDragPos.isNull()) {
 
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        return;
 
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    }
 
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    qreal ratio = d->mDocView->boundingRect().width() / d->mVisibleRect.width();
 
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    QPointF mousePos = event->pos();
 
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    QPointF viewPos = d->mDocView->position() + (mousePos - d->mLastDragPos) * ratio;
 
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    d->mLastDragPos = mousePos;
 
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    d->mDocView->setPosition(viewPos.toPoint());
 
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}
 
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void BirdEyeView::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
 
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{
 
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    QGraphicsItem::mouseReleaseEvent(event);
 
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    if (d->mLastDragPos.isNull()) {
 
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        return;
 
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    }
 
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    setCursor(Qt::OpenHandCursor);
 
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    d->mLastDragPos = QPointF();
 
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}
 
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} // namespace