Printing: Add Printer class that holds the rendering logic.

Render Html pages into a QWebView then print it using QPainter. the
Printer::print() is called that prepare the HTML file to be rendered by
the QWebView.
Printer::render() will do the rendering task.

Signed-off-by: Gehad elrobey <gehadelrobey@gmail.com>
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

CMakeLists.txt

@@ -261,6 +261,7 @@ set(SUBSURFACE_CORE_LIB_SRCS
 	configuredivecomputerthreads.cpp
 	divesitehelpers.cpp
 	templatelayout.cpp
+	printer.cpp
 	${PLATFORM_SRC}
 )
 source_group("Subsurface Core" FILES ${SUBSURFACE_CORE_LIB_SRCS})

printer.cpp

@@ -0,0 +1,48 @@
+#include "printer.h"
+#include "templatelayout.h"
+
+#include <QtWebKitWidgets>
+#include <QPainter>
+
+#define A4_300DPI_WIDTH 2480
+#define A4_300DPI_HIGHT 3508
+
+Printer::Printer(QPrinter *printer)
+{
+	this->printer = printer;
+
+	//override these settings for now.
+	printer->setFullPage(true);
+	printer->setOrientation(QPrinter::Portrait);
+	printer->setPaperSize(QPrinter::A4);
+	printer->setPrintRange(QPrinter::AllPages);
+	printer->setResolution(300);
+}
+
+void Printer::render()
+{
+	QPainter painter;
+	QSize size(A4_300DPI_WIDTH, A4_300DPI_HIGHT);
+	painter.begin(printer);
+	painter.setRenderHint(QPainter::Antialiasing);
+	painter.setRenderHint(QPainter::SmoothPixmapTransform);
+
+	webView->page()->setViewportSize(size);
+
+	int Pages = ceil((float)webView->page()->mainFrame()->contentsSize().rheight() / A4_300DPI_HIGHT);
+	for (int i = 0; i < Pages; i++) {
+		webView->page()->mainFrame()->render(&painter, QWebFrame::ContentsLayer);
+		webView->page()->mainFrame()->scroll(0, A4_300DPI_HIGHT);
+		if (i < Pages - 1)
+			printer->newPage();
+	}
+	painter.end();
+}
+
+void Printer::print()
+{
+	TemplateLayout t;
+	webView = new QWebView();
+	webView->setHtml(t.generate());
+	render();
+}

printer.h

@@ -0,0 +1,20 @@
+#ifndef PRINTER_H
+#define PRINTER_H
+
+#include <QPrinter>
+#include <QWebView>
+
+class Printer : public QObject {
+	Q_OBJECT
+
+private:
+	QPrinter *printer;
+	QWebView *webView;
+	void render();
+
+public:
+	Printer(QPrinter *printer);
+	void print();
+};
+
+#endif //PRINTER_H

subsurface.pro

@@ -68,6 +68,7 @@ HEADERS = \
 	units.h \
 	divecomputer.h \
 	templatelayout.h \
+	printer.h \
 	qt-ui/about.h \
 	qt-ui/completionmodels.h \
 	qt-ui/divecomputermanagementdialog.h \
@@ -162,6 +163,7 @@ SOURCES =  \
 	gaspressures.c \
 	divecomputer.cpp \
 	templatelayout.cpp \
+	printer.cpp \
 	worldmap-save.c \
 	save-html.c \
 	qt-gui.cpp \