Printing: don't break dives into successive pages

While rendering a template with "0" dives per page value, try to fit
as many dives per page but don't break a dive into 2 pages.

Use a dynamically sized view port to fit the rendered area only,
and don't render the full page.

All the Template elements that shouldn't be broken should have
the CSS class "dontbreak".

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

2 files changed, 43 insertions, 2 deletions

diff --git a/printer.cpp b/printer.cpp
index 115b17526..5d7adcacc 100644
--- a/printer.cpp
+++ b/printer.cpp
@@ -57,6 +57,46 @@ void Printer::putProfileImage(QRect profilePlaceholder, QRect viewPort, QPainter
 	}
 }
 
+void Printer::flowRender()
+{
+	// render the Qwebview
+	QPainter painter;
+	QRect viewPort(0, 0, 0, 0);
+	painter.begin(paintDevice);
+	painter.setRenderHint(QPainter::Antialiasing);
+	painter.setRenderHint(QPainter::SmoothPixmapTransform);
+
+	// get all references to dontbreak divs
+	int start = 0, end = 0;
+	int fullPageResolution = webView->page()->mainFrame()->contentsSize().height();
+	QWebElementCollection dontbreak = webView->page()->mainFrame()->findAllElements(".dontbreak");
+	foreach (QWebElement dontbreakElement, dontbreak) {
+		if ((dontbreakElement.geometry().y() + dontbreakElement.geometry().height()) - start < pageSize.height()) {
+			// One more element can be placed
+			end = dontbreakElement.geometry().y() + dontbreakElement.geometry().height();
+		} else {
+			QRegion reigon(0, 0, pageSize.width(), end - start);
+			viewPort.setRect(0, start, pageSize.width(), end - start);
+
+			// render the base Html template
+			webView->page()->mainFrame()->render(&painter, QWebFrame::ContentsLayer, reigon);
+
+			// scroll the webview to the next page
+			webView->page()->mainFrame()->scroll(0, dontbreakElement.geometry().y() - start);
+
+			// rendering progress is 4/5 of total work
+			emit(progessUpdated((end * 80.0 / fullPageResolution) + done));
+			static_cast<QPrinter*>(paintDevice)->newPage();
+			start = dontbreakElement.geometry().y();
+		}
+	}
+	// render the remianing page
+	QRegion reigon(0, 0, pageSize.width(), end - start);
+	webView->page()->mainFrame()->render(&painter, QWebFrame::ContentsLayer, reigon);
+
+	painter.end();
+}
+
 void Printer::render(int Pages = 0)
 {
 	// keep original preferences
@@ -175,11 +215,11 @@ void Printer::print()
 		int paddingBottom = pageSize.height() - (webView->page()->mainFrame()->contentsSize().height() % pageSize.height());
 		QString styleString = QString::fromUtf8("padding-bottom: ") + QString::number(paddingBottom) + "px;";
 		webView->page()->mainFrame()->findFirstElement("body").setAttribute("style", styleString);
-		Pages = ceil(webView->page()->mainFrame()->contentsSize().height() / (float)pageSize.height());
+		flowRender();
 	} else {
 		Pages = ceil(getTotalWork(printOptions) / (float)divesPerPage);
+		render(Pages);
 	}
-	render(Pages);
 }
 
 void Printer::print_statistics()
diff --git a/printer.h b/printer.h
index c0775fa4b..5c7652a8d 100644
--- a/printer.h
+++ b/printer.h
@@ -29,6 +29,7 @@ private:
 	int done;
 	int dpi;
 	void render(int Pages);
+	void flowRender();
 	void putProfileImage(QRect box, QRect viewPort, QPainter *painter, struct dive *dive, QPointer<ProfileWidget2> profile);
 
 private slots: