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Diffstat (limited to 'src-qt5/desktop-utils/lumina-pdf/PrintWidget.h')
| -rw-r--r-- | src-qt5/desktop-utils/lumina-pdf/PrintWidget.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src-qt5/desktop-utils/lumina-pdf/PrintWidget.h b/src-qt5/desktop-utils/lumina-pdf/PrintWidget.h new file mode 100644 index 00000000..81e4e794 --- /dev/null +++ b/src-qt5/desktop-utils/lumina-pdf/PrintWidget.h @@ -0,0 +1,171 @@ +//=========================================== +// Lumina Desktop source code +// Copyright (c) 2017, Ken Moore +// Available under the 3-clause BSD license +// See the LICENSE file for full details +//=========================================== +// Simple subclass of QPrintPreviewWidget to provide +// notification when a context menu is requested +//=========================================== +#ifndef _PRINT_GRAPHICS_H +#define _PRINT_GRAPHICS_H + +#include <QMouseEvent> +#include <QDebug> +#include <QGraphicsView> +#include <QGraphicsItem> +#include <QBoxLayout> +#include <QScrollBar> +#include <QStyleOptionGraphicsItem> +#include <QtMath> +#include <QPrinter> +namespace { +class PageItem : public QGraphicsItem +{ +public: + PageItem(int _pageNum, const QImage _pagePicture, QSize _paperSize, QRect _pageRect) + : pageNum(_pageNum), pagePicture(_pagePicture), + paperSize(_paperSize), pageRect(_pageRect) + { + qreal border = qMax(paperSize.height(), paperSize.width()) / 25; + brect = QRectF(QPointF(-border, -border), + QSizeF(paperSize)+QSizeF(2*border, 2*border)); + setCacheMode(DeviceCoordinateCache); + } + + QRectF boundingRect() const Q_DECL_OVERRIDE + { return brect; } + + inline int pageNumber() const + { return pageNum; } + + void paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget) Q_DECL_OVERRIDE; + +private: + int pageNum; + const QImage pagePicture; + QSize paperSize; + QRect pageRect; + QRectF brect; +}; + +void PageItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) +{ + Q_UNUSED(widget); + QRectF paperRect(0,0, paperSize.width(), paperSize.height()); + + // Draw shadow + painter->setClipRect(option->exposedRect); + qreal shWidth = paperRect.width()/100; + QRectF rshadow(paperRect.topRight() + QPointF(0, shWidth), + paperRect.bottomRight() + QPointF(shWidth, 0)); + QLinearGradient rgrad(rshadow.topLeft(), rshadow.topRight()); + rgrad.setColorAt(0.0, QColor(0,0,0,255)); + rgrad.setColorAt(1.0, QColor(0,0,0,0)); + painter->fillRect(rshadow, QBrush(rgrad)); + QRectF bshadow(paperRect.bottomLeft() + QPointF(shWidth, 0), + paperRect.bottomRight() + QPointF(0, shWidth)); + QLinearGradient bgrad(bshadow.topLeft(), bshadow.bottomLeft()); + bgrad.setColorAt(0.0, QColor(0,0,0,255)); + bgrad.setColorAt(1.0, QColor(0,0,0,0)); + painter->fillRect(bshadow, QBrush(bgrad)); + QRectF cshadow(paperRect.bottomRight(), + paperRect.bottomRight() + QPointF(shWidth, shWidth)); + QRadialGradient cgrad(cshadow.topLeft(), shWidth, cshadow.topLeft()); + cgrad.setColorAt(0.0, QColor(0,0,0,255)); + cgrad.setColorAt(1.0, QColor(0,0,0,0)); + painter->fillRect(cshadow, QBrush(cgrad)); + + painter->setClipRect(paperRect & option->exposedRect); + painter->fillRect(paperRect, Qt::white); + if (pagePicture.isNull()) + return; + painter->drawImage(pageRect.topLeft(), pagePicture); + + // Effect: make anything drawn in the margins look washed out. + QPainterPath path; + path.addRect(paperRect); + path.addRect(pageRect); + painter->setPen(QPen(Qt::NoPen)); + painter->setBrush(QColor(255, 255, 255, 180)); + painter->drawPath(path); +} +} + +class PrintWidget : public QGraphicsView +{ + Q_OBJECT +public: + PrintWidget(QPrinter *printer, QWidget *parent = 0); + ~PrintWidget(); + enum ViewMode { + SinglePageView, + FacingPagesView, + AllPagesView + }; + + enum ZoomMode { + CustomZoom, + FitToWidth, + FitInView + }; + + double getZoomFactor() const { return this->zoomFactor; }; + ZoomMode getZoomMode() const { return this->zoomMode; }; + int currentPage() const { return curPage; }; + void setPictures(QHash<int, QImage>*); + +signals: + void resized(); + void customContextMenuRequested(const QPoint&); + void paintRequested(QPrinter*); +public slots: + void zoomIn(double factor=1.2); + void zoomOut(double factor=1.2); + void setCurrentPage(int); + void setVisible(bool) Q_DECL_OVERRIDE; + + void fitView(); + void fitToWidth(); + void setAllPagesViewMode(); + void setSinglePageViewMode(); + void setFacingPagesViewMode(); + + void updateCurrentPage(); + int calcCurrentPage(); + void fit(bool doFitting=false); + void updatePreview(); +protected: + void resizeEvent(QResizeEvent* e) Q_DECL_OVERRIDE { + /*{ + const QSignalBlocker blocker(verticalScrollBar()); // Don't change page, QTBUG-14517 + QGraphicsView::resizeEvent(e); + }*/ + QGraphicsView::resizeEvent(e); + emit resized(); + } + + void showEvent(QShowEvent* e) Q_DECL_OVERRIDE { + QGraphicsView::showEvent(e); + emit resized(); + } +private: + void generatePreview(); + void layoutPages(); + void populateScene(); + void setViewMode(ViewMode); + void setZoomMode(ZoomMode); + QGraphicsScene *scene; + QPrinter *printer; + QPreviewPaintEngine *previewEngine; + QPdfPrintEngine *pdfEngine; + + int curPage; + ViewMode viewMode; + ZoomMode zoomMode; + double zoomFactor; + bool initialized, fitting; + QList<QGraphicsItem *> pages; + QHash<int, QImage> *pictures; +}; +#endif |