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//===========================================
// 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 <QPageLayout>
#include <poppler/qt5/poppler-qt5.h>
class PageItem : public QGraphicsItem {
public:
PageItem(int _pageNum, QImage _pagePicture, QSize _paperSize, int _degrees)
: pageNum(_pageNum), pagePicture(_pagePicture), paperSize(_paperSize), degrees(_degrees)
{
brect = QRectF(QPointF(-25, -25),
QSizeF(paperSize)+QSizeF(50, 50));
setCacheMode(DeviceCoordinateCache);
}
QRectF boundingRect() const Q_DECL_OVERRIDE
{ return brect; }
inline int pageNumber() const
{ return pageNum; }
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) Q_DECL_OVERRIDE
{
Q_UNUSED(widget);
//Ensure all the antialiasing/smoothing options are turned on
painter->setRenderHint(QPainter::Antialiasing);
painter->setRenderHint(QPainter::TextAntialiasing);
painter->setRenderHint(QPainter::SmoothPixmapTransform);
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));
QMatrix matrix;
switch(degrees) {
case 270:
matrix = QMatrix(0, -1, 1, 0, 0, 0);
break;
case 90:
matrix = QMatrix(0, 1, -1, 0, 0, 0);
break;
case 180:
matrix = QMatrix(-1, 0, 0, -1, 0, 0);
break;
default:
matrix = QMatrix(1, 0, 0, 1, 0 ,0);
}
painter->setClipRect(paperRect & option->exposedRect);
painter->fillRect(paperRect, Qt::white);
if (pagePicture.isNull()){
qDebug() << "NULL";
return;
}
if(degrees != 0)
pagePicture = pagePicture.transformed(matrix, Qt::SmoothTransformation);
painter->drawImage(QPoint(0,0), pagePicture);
}
private:
int pageNum;
QImage pagePicture;
QSize paperSize;
QRectF brect;
int degrees;
};
class PrintWidget : public QGraphicsView
{
Q_OBJECT
public:
enum ViewMode {
SinglePageView,
FacingPagesView,
AllPagesView
};
enum ZoomMode {
CustomZoom,
FitToWidth,
FitInView
};
private:
void generatePreview();
void layoutPages();
void populateScene();
void setViewMode(ViewMode);
void setZoomMode(ZoomMode);
QGraphicsScene *scene;
int curPage, publicPageNum;
ViewMode viewMode;
ZoomMode zoomMode;
QPageLayout::Orientation orientation;
double zoomFactor;
bool initialized, fitting;
QList<QGraphicsItem*> pages;
QHash<int, QImage> *pictures;
Poppler::Document *doc;
int degrees;
public:
PrintWidget(QWidget *parent = 0);
~PrintWidget();
double getZoomFactor() const { return this->zoomFactor; };
ZoomMode getZoomMode() const { return this->zoomMode; };
int currentPage() const { return publicPageNum; };
void setPictures(QHash<int, QImage>*);
signals:
void resized();
void customContextMenuRequested(const QPoint&);
void currentPageChanged();
public slots:
void zoomIn(double factor=1.2);
void zoomOut(double factor=1.2);
void setCurrentPage(int);
void setVisible(bool) Q_DECL_OVERRIDE;
void highlightText(int, QRectF);
void receiveDocument(Poppler::Document*);
void setDegrees(int);
void updatePreview();
void fitView();
void fitToWidth();
void setAllPagesViewMode();
void setSinglePageViewMode();
void setFacingPagesViewMode();
private slots:
void updateCurrentPage();
int calcCurrentPage();
void fit(bool doFitting=false);
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();
}
};
#endif
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