diff --git a/lib/documentview/abstractimageview.cpp b/lib/documentview/abstractimageview.cpp index 66d9ebf1..3b4a3c2c 100644 --- a/lib/documentview/abstractimageview.cpp +++ b/lib/documentview/abstractimageview.cpp @@ -1,579 +1,592 @@ // vim: set tabstop=4 shiftwidth=4 expandtab: /* Gwenview: an image viewer Copyright 2011 Aurélien Gâteau 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, Cambridge, MA 02110-1301, USA. */ // Self #include "abstractimageview.h" // Local // KDE // Qt #include +#include #include #include #include namespace Gwenview { static const int UNIT_STEP = 16; struct AbstractImageViewPrivate { enum Verbosity { Silent, Notify }; AbstractImageView* q; QCursor mZoomCursor; Document::Ptr mDocument; bool mControlKeyIsDown; bool mEnlargeSmallerImages; qreal mZoom; bool mZoomToFit; bool mZoomToFill; QPointF mImageOffset; QPointF mScrollPos; QPointF mLastDragPos; QSizeF mDocumentSize; void adjustImageOffset(Verbosity verbosity = Notify) { QSizeF zoomedDocSize = q->documentSize() * mZoom; QSizeF viewSize = q->boundingRect().size(); QPointF offset( qMax((viewSize.width() - zoomedDocSize.width()) / 2, qreal(0.)), qMax((viewSize.height() - zoomedDocSize.height()) / 2, qreal(0.)) ); if (offset != mImageOffset) { mImageOffset = offset; if (verbosity == Notify) { q->onImageOffsetChanged(); } } } void adjustScrollPos(Verbosity verbosity = Notify) { setScrollPos(mScrollPos, verbosity); } void setScrollPos(const QPointF& _newPos, Verbosity verbosity = Notify) { if (!mDocument) { mScrollPos = _newPos; return; } QSizeF zoomedDocSize = q->documentSize() * mZoom; QSizeF viewSize = q->boundingRect().size(); QPointF newPos( qBound(qreal(0.), _newPos.x(), zoomedDocSize.width() - viewSize.width()), qBound(qreal(0.), _newPos.y(), zoomedDocSize.height() - viewSize.height()) ); if (newPos != mScrollPos) { QPointF oldPos = mScrollPos; mScrollPos = newPos; if (verbosity == Notify) { q->onScrollPosChanged(oldPos); } // No verbosity test: we always notify the outside world about // scrollPos changes QMetaObject::invokeMethod(q, "scrollPosChanged"); } } void setupZoomCursor() { // We do not use "appdata" here because that does not work when this // code is called from a KPart. const QString path = QStandardPaths::locate(QStandardPaths::GenericDataLocation, QStringLiteral("gwenview/cursors/zoom.png")); QPixmap cursorPixmap = QPixmap(path); mZoomCursor = QCursor(cursorPixmap, 11, 11); } }; AbstractImageView::AbstractImageView(QGraphicsItem* parent) : QGraphicsWidget(parent) , d(new AbstractImageViewPrivate) { d->q = this; d->mControlKeyIsDown = false; d->mEnlargeSmallerImages = false; d->mZoom = 1; d->mZoomToFit = true; d->mZoomToFill = false; d->mImageOffset = QPointF(0, 0); d->mScrollPos = QPointF(0, 0); setFocusPolicy(Qt::WheelFocus); setFlag(ItemIsSelectable); setAcceptHoverEvents(true); d->setupZoomCursor(); updateCursor(); } AbstractImageView::~AbstractImageView() { if (d->mDocument) { d->mDocument->stopAnimation(); } delete d; } Document::Ptr AbstractImageView::document() const { return d->mDocument; } void AbstractImageView::setDocument(Document::Ptr doc) { if (d->mDocument) { disconnect(d->mDocument.data(), 0, this, 0); } d->mDocument = doc; loadFromDocument(); } QSizeF AbstractImageView::documentSize() const { return d->mDocument ? d->mDocument->size() : QSizeF(); } qreal AbstractImageView::zoom() const { return d->mZoom; } void AbstractImageView::setZoom(qreal zoom, const QPointF& _center, AbstractImageView::UpdateType updateType) { if (!d->mDocument) { d->mZoom = zoom; return; } if (updateType == UpdateIfNecessary && qFuzzyCompare(zoom, d->mZoom) && documentSize() == d->mDocumentSize) { return; } qreal oldZoom = d->mZoom; d->mZoom = zoom; d->mDocumentSize = documentSize(); QPointF center; if (_center == QPointF(-1, -1)) { center = boundingRect().center(); } else { center = _center; } /* We want to keep the point at viewport coordinates "center" at the same position after zooming. The coordinates of this point in image coordinates can be expressed like this: oldScroll + center imagePointAtOldZoom = ------------------ oldZoom scroll + center imagePointAtZoom = --------------- zoom So we want: imagePointAtOldZoom = imagePointAtZoom oldScroll + center scroll + center <=> ------------------ = --------------- oldZoom zoom zoom <=> scroll = ------- (oldScroll + center) - center oldZoom */ /* Compute oldScroll It's useless to take the new offset in consideration because if a direction of the new offset is not 0, we won't be able to center on a specific point in that direction. */ QPointF oldScroll = scrollPos() - imageOffset(); QPointF scroll = (zoom / oldZoom) * (oldScroll + center) - center; d->adjustImageOffset(AbstractImageViewPrivate::Silent); d->setScrollPos(scroll, AbstractImageViewPrivate::Silent); onZoomChanged(); zoomChanged(d->mZoom); } bool AbstractImageView::zoomToFit() const { return d->mZoomToFit; } bool AbstractImageView::zoomToFill() const { return d->mZoomToFill; } void AbstractImageView::setZoomToFit(bool on) { d->mZoomToFit = on; if (on) { setZoom(computeZoomToFit()); } // We do not set zoom to 1 if zoomToFit is off, this is up to the code // calling us. It may went to zoom to some other level and/or to zoom on // a particular position zoomToFitChanged(d->mZoomToFit); } void AbstractImageView::setZoomToFill(bool on) { d->mZoomToFill = on; if (on) { setZoom(computeZoomToFill()); } // We do not set zoom to 1 if zoomToFit is off, this is up to the code // calling us. It may went to zoom to some other level and/or to zoom on // a particular position zoomToFillChanged(d->mZoomToFill); } void AbstractImageView::resizeEvent(QGraphicsSceneResizeEvent* event) { QGraphicsWidget::resizeEvent(event); if (d->mZoomToFit) { // setZoom() calls adjustImageOffset(), but only if the zoom changes. // If the view is resized but does not cause a zoom change, we call // adjustImageOffset() ourself. const qreal newZoom = computeZoomToFit(); if (qFuzzyCompare(zoom(), newZoom)) { d->adjustImageOffset(AbstractImageViewPrivate::Notify); } else { setZoom(newZoom); } } else if (d->mZoomToFill) { const qreal newZoom = computeZoomToFill(); if (qFuzzyCompare(zoom(), newZoom)) { d->adjustImageOffset(AbstractImageViewPrivate::Notify); } else { setZoom(newZoom); } } else { d->adjustImageOffset(); d->adjustScrollPos(); } } +void AbstractImageView::focusInEvent(QFocusEvent* event) +{ + QGraphicsWidget::focusInEvent(event); + + // We might have missed a keyReleaseEvent for the control key, e.g. for Ctrl+O + const bool controlKeyIsCurrentlyDown = QGuiApplication::queryKeyboardModifiers() & Qt::ControlModifier; + if (d->mControlKeyIsDown != controlKeyIsCurrentlyDown) { + d->mControlKeyIsDown = controlKeyIsCurrentlyDown; + updateCursor(); + } +} + qreal AbstractImageView::computeZoomToFit() const { QSizeF docSize = documentSize(); if (docSize.isEmpty()) { return 1; } QSizeF viewSize = boundingRect().size(); qreal fitWidth = viewSize.width() / docSize.width(); qreal fitHeight = viewSize.height() / docSize.height(); qreal fit = qMin(fitWidth, fitHeight); if (!d->mEnlargeSmallerImages) { fit = qMin(fit, qreal(1.)); } return fit; } qreal AbstractImageView::computeZoomToFill() const { QSizeF docSize = documentSize(); if (docSize.isEmpty()) { return 1; } QSizeF viewSize = boundingRect().size(); qreal fitWidth = viewSize.width() / docSize.width(); qreal fitHeight = viewSize.height() / docSize.height(); qreal fill = qMax(fitWidth, fitHeight); if (!d->mEnlargeSmallerImages) { fill = qMin(fill, qreal(1.)); } return fill; } void AbstractImageView::mousePressEvent(QGraphicsSceneMouseEvent* event) { QGraphicsItem::mousePressEvent(event); if (event->button() == Qt::MiddleButton) { bool value = !zoomToFit(); setZoomToFit(value); if (!value) { setZoom(1., event->pos()); } return; } if (event->modifiers() & Qt::ControlModifier) { if (event->button() == Qt::LeftButton) { zoomInRequested(event->pos()); return; } else if (event->button() == Qt::RightButton) { zoomOutRequested(event->pos()); return; } } d->mLastDragPos = event->pos(); updateCursor(); } void AbstractImageView::mouseMoveEvent(QGraphicsSceneMouseEvent* event) { QGraphicsItem::mouseMoveEvent(event); QPointF mousePos = event->pos(); QPointF newScrollPos = d->mScrollPos + d->mLastDragPos - mousePos; #if 0 // commented out due to mouse pointer warping around, bug in Qt? // Wrap mouse pos qreal maxWidth = boundingRect().width(); qreal maxHeight = boundingRect().height(); // We need a margin because if the window is maximized, the mouse may not // be able to go past the bounding rect. // The mouse get placed 1 pixel before/after the margin to avoid getting // considered as needing to wrap the other way in next mouseMoveEvent // (because we don't check the move vector) const int margin = 5; if (mousePos.x() <= margin) { mousePos.setX(maxWidth - margin - 1); } else if (mousePos.x() >= maxWidth - margin) { mousePos.setX(margin + 1); } if (mousePos.y() <= margin) { mousePos.setY(maxHeight - margin - 1); } else if (mousePos.y() >= maxHeight - margin) { mousePos.setY(margin + 1); } // Set mouse pos (Hackish translation to screen coords!) QPointF screenDelta = event->screenPos() - event->pos(); QCursor::setPos((mousePos + screenDelta).toPoint()); #endif d->mLastDragPos = mousePos; d->setScrollPos(newScrollPos); } void AbstractImageView::mouseReleaseEvent(QGraphicsSceneMouseEvent* event) { QGraphicsItem::mouseReleaseEvent(event); if (!d->mLastDragPos.isNull()) { d->mLastDragPos = QPointF(); } updateCursor(); } void AbstractImageView::keyPressEvent(QKeyEvent* event) { if (event->key() == Qt::Key_Control) { d->mControlKeyIsDown = true; updateCursor(); return; } if (zoomToFit() || qFuzzyCompare(computeZoomToFit(), zoom())) { if (event->modifiers() != Qt::NoModifier) { return; } switch (event->key()) { case Qt::Key_Left: case Qt::Key_Up: previousImageRequested(); break; case Qt::Key_Right: case Qt::Key_Down: nextImageRequested(); break; default: break; } return; } QPointF delta(0, 0); qreal pageStep = boundingRect().height(); qreal unitStep; if (event->modifiers() & Qt::ShiftModifier) { unitStep = pageStep / 2; } else { unitStep = UNIT_STEP; } switch (event->key()) { case Qt::Key_Left: delta.setX(-unitStep); break; case Qt::Key_Right: delta.setX(unitStep); break; case Qt::Key_Up: delta.setY(-unitStep); break; case Qt::Key_Down: delta.setY(unitStep); break; case Qt::Key_PageUp: delta.setY(-pageStep); break; case Qt::Key_PageDown: delta.setY(pageStep); break; case Qt::Key_Home: d->setScrollPos(QPointF(d->mScrollPos.x(), 0)); return; case Qt::Key_End: d->setScrollPos(QPointF(d->mScrollPos.x(), documentSize().height() * zoom())); return; default: return; } d->setScrollPos(d->mScrollPos + delta); } void AbstractImageView::keyReleaseEvent(QKeyEvent* event) { if (event->key() == Qt::Key_Control) { d->mControlKeyIsDown = false; updateCursor(); } } void AbstractImageView::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event) { if (event->modifiers() == Qt::NoModifier) { toggleFullScreenRequested(); } } QPointF AbstractImageView::imageOffset() const { return d->mImageOffset; } QPointF AbstractImageView::scrollPos() const { return d->mScrollPos; } void AbstractImageView::setScrollPos(const QPointF& pos) { d->setScrollPos(pos); } QPointF AbstractImageView::mapToView(const QPointF& imagePos) const { return imagePos * d->mZoom + d->mImageOffset - d->mScrollPos; } QPoint AbstractImageView::mapToView(const QPoint& imagePos) const { return mapToView(QPointF(imagePos)).toPoint(); } QRectF AbstractImageView::mapToView(const QRectF& imageRect) const { return QRectF( mapToView(imageRect.topLeft()), imageRect.size() * zoom() ); } QRect AbstractImageView::mapToView(const QRect& imageRect) const { return QRect( mapToView(imageRect.topLeft()), imageRect.size() * zoom() ); } QPointF AbstractImageView::mapToImage(const QPointF& viewPos) const { return (viewPos - d->mImageOffset + d->mScrollPos) / d->mZoom; } QPoint AbstractImageView::mapToImage(const QPoint& viewPos) const { return mapToImage(QPointF(viewPos)).toPoint(); } QRectF AbstractImageView::mapToImage(const QRectF& viewRect) const { return QRectF( mapToImage(viewRect.topLeft()), viewRect.size() / zoom() ); } QRect AbstractImageView::mapToImage(const QRect& viewRect) const { return QRect( mapToImage(viewRect.topLeft()), viewRect.size() / zoom() ); } void AbstractImageView::setEnlargeSmallerImages(bool value) { d->mEnlargeSmallerImages = value; if (zoomToFit()) { setZoom(computeZoomToFit()); } } void AbstractImageView::updateCursor() { if (d->mControlKeyIsDown) { setCursor(d->mZoomCursor); } else { if (d->mLastDragPos.isNull()) { setCursor(Qt::OpenHandCursor); } else { setCursor(Qt::ClosedHandCursor); } } } QSizeF AbstractImageView::visibleImageSize() const { if (!document()) { return QSizeF(); } QSizeF size = documentSize() * zoom(); return size.boundedTo(boundingRect().size()); } void AbstractImageView::applyPendingScrollPos() { d->adjustImageOffset(); d->adjustScrollPos(); } } // namespace diff --git a/lib/documentview/abstractimageview.h b/lib/documentview/abstractimageview.h index e1c0e0b2..0ff0260b 100644 --- a/lib/documentview/abstractimageview.h +++ b/lib/documentview/abstractimageview.h @@ -1,147 +1,148 @@ // vim: set tabstop=4 shiftwidth=4 expandtab: /* Gwenview: an image viewer Copyright 2011 Aurélien Gâteau 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, Cambridge, MA 02110-1301, USA. */ #ifndef ABSTRACTIMAGEVIEW_H #define ABSTRACTIMAGEVIEW_H // Local #include // KDE // Qt #include namespace Gwenview { struct AbstractImageViewPrivate; /** * */ class AbstractImageView : public QGraphicsWidget { Q_OBJECT public: enum UpdateType { UpdateIfNecessary, ForceUpdate }; AbstractImageView(QGraphicsItem* parent); ~AbstractImageView(); qreal zoom() const; virtual void setZoom(qreal zoom, const QPointF& center = QPointF(-1, -1), UpdateType updateType = UpdateIfNecessary); bool zoomToFit() const; bool zoomToFill() const; virtual void setZoomToFit(bool value); virtual void setZoomToFill(bool value); virtual void setDocument(Document::Ptr doc); Document::Ptr document() const; qreal computeZoomToFit() const; qreal computeZoomToFill() const; QSizeF documentSize() const; QSizeF visibleImageSize() const; /** * If the image is smaller than the view, imageOffset is the distance from * the topleft corner of the view to the topleft corner of the image. * Neither x nor y can be negative. */ QPointF imageOffset() const; /** * The scroll position, in zoomed image coordinates. * x and y are always between 0 and (docsize * zoom - viewsize) */ QPointF scrollPos() const; void setScrollPos(const QPointF& pos); QPointF mapToView(const QPointF& imagePos) const; QPoint mapToView(const QPoint& imagePos) const; QRectF mapToView(const QRectF& imageRect) const; QRect mapToView(const QRect& imageRect) const; QPointF mapToImage(const QPointF& viewPos) const; QPoint mapToImage(const QPoint& viewPos) const; QRectF mapToImage(const QRectF& viewRect) const; QRect mapToImage(const QRect& viewRect) const; void setEnlargeSmallerImages(bool value); void applyPendingScrollPos(); public Q_SLOTS: void updateCursor(); Q_SIGNALS: void zoomToFitChanged(bool); void zoomToFillChanged(bool); void zoomChanged(qreal); void zoomInRequested(const QPointF&); void zoomOutRequested(const QPointF&); void scrollPosChanged(); void completed(); void previousImageRequested(); void nextImageRequested(); void toggleFullScreenRequested(); protected: virtual void loadFromDocument() = 0; virtual void onZoomChanged() = 0; /** * Called when the offset changes. * Note: to avoid multiple adjustments, this is not called if zoom changes! */ virtual void onImageOffsetChanged() = 0; /** * Called when the scrollPos changes. * Note: to avoid multiple adjustments, this is not called if zoom changes! */ virtual void onScrollPosChanged(const QPointF& oldPos) = 0; void resizeEvent(QGraphicsSceneResizeEvent* event) Q_DECL_OVERRIDE; + void focusInEvent(QFocusEvent* event) Q_DECL_OVERRIDE; void keyPressEvent(QKeyEvent* event) Q_DECL_OVERRIDE; void keyReleaseEvent(QKeyEvent* event) Q_DECL_OVERRIDE; void mousePressEvent(QGraphicsSceneMouseEvent* event) Q_DECL_OVERRIDE; void mouseMoveEvent(QGraphicsSceneMouseEvent* event) Q_DECL_OVERRIDE; void mouseReleaseEvent(QGraphicsSceneMouseEvent* event) Q_DECL_OVERRIDE; void mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event) Q_DECL_OVERRIDE; private: friend struct AbstractImageViewPrivate; AbstractImageViewPrivate* const d; }; } // namespace #endif /* ABSTRACTIMAGEVIEW_H */