Print: add a setup() method to PrintLayout

The setup() method will be called each time to obtain the
current printer settings. Also it calculates required scalling
based on screen agains printer DPI.

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

qt-ui/printdialog.cpp

@@ -43,6 +43,9 @@ void PrintDialog::runDialog()
 
 void PrintDialog::printClicked(void)
 {
-	// nop for now
+	// temporary
+	printer.setOutputFileName("print.pdf");
+	printer.setOutputFormat(QPrinter::PdfFormat);
+	// ---------
 	printLayout->print();
 }

qt-ui/printlayout.cpp

@@ -1,4 +1,6 @@
 #include <QPainter>
+#include <QDesktopWidget>
+#include <QApplication>
 #include "mainwindow.h"
 #include "printlayout.h"
 
@@ -21,6 +23,8 @@ PrintLayout::PrintLayout(PrintDialog *dialogPtr, QPrinter *printerPtr, struct op
 
 void PrintLayout::print()
 {
+	// we call setup each time to check if the printer properties have changed
+	setup();
 	switch (printOptions->type) {
 	case options::PRETTY:
 		printSixDives();
@@ -34,6 +38,19 @@ void PrintLayout::print()
 	}
 }
 
+void PrintLayout::setup()
+{
+	QDesktopWidget *desktop = QApplication::desktop();
+	screenDpiX = desktop->physicalDpiX();
+	screenDpiY = desktop->physicalDpiX();
+
+	printerDpi = printer->resolution();
+	pageRect = printer->pageRect();
+
+	scaleX = (qreal)printerDpi/(qreal)screenDpiX;
+	scaleY = (qreal)printerDpi/(qreal)screenDpiY;
+}
+
 void PrintLayout::printSixDives()
 {
 	// nop

qt-ui/printlayout.h

@@ -20,7 +20,11 @@ private:
 	struct options *printOptions;
 
 	QPainter painter;
+	int screenDpiX, screenDpiY, printerDpi;
+	qreal scaleX, scaleY;
+	QRect pageRect;
 
+	void setup();
 	void printSixDives();
 	void printTwoDives();
 	void printTable();