1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
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
|
