Overview
Examples
Screenshots
Comparisons
Applications
Download
Documentation
Tutorials
Bazaar
Status & Roadmap
FAQ
Authors & License
Forums
Funding Ultimate++
Search on this site
Search in forums












SourceForge.net Logo
Home » Community » Newbie corner » Attempting to get a canvas to display...
Attempting to get a canvas to display... [message #47753] Sun, 19 March 2017 03:44 Go to next message
ptkacz is currently offline  ptkacz
Messages: 29
Registered: March 2017
Promising Member
Hi All,

I'm attempting to create a simple application in order to begin learn how to make use of U++. The application consists of two panels, on the left, a button panel with three buttons labeled 'A', 'B', 'C', on the right, a canvas. Selection of any of the buttons is to result in some text displaying on the canvas. Unfortunately, the canvas does not display. Could some one please point out what needs to be done? Code an layout are listed below.


Peter


UppApp.lay:
==========================================
LAYOUT(UppAppLayout, 364, 192)
END_LAYOUT

LAYOUT(ButtonLayout, 80, 84)
ITEM(Button, aBtn, SetLabel(t_("A")).LeftPosZ(12, 56).TopPosZ(8, 15))
ITEM(Button, bBtn, SetLabel(t_("B")).LeftPosZ(12, 56).TopPosZ(32, 15))
ITEM(Button, cBtn, SetLabel(t_("C")).LeftPosZ(12, 56).TopPosZ(56, 15))
END_LAYOUT



DrawCanvas.h:
==========================================
#ifndef _UppApp_DrawCanvas_h_
#define _UppApp_DrawCanvas_h_

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

class DrawCanvas : public ParentCtrl {
typedef DrawCanvas CLASSNAME;

public:
DrawCanvas();
virtual void Paint(Draw& d);
void displayMessage(String s);

private:
String stringToDisplay = "Not Yet!";
};

#endif



DrawCanvas.cpp:
==========================================
#include "UppApp.h"
#include "DrawCanvas.h"

DrawCanvas::DrawCanvas() {
}

void DrawCanvas::Paint(Draw& d) {
Size(500, 500);
d.DrawRect(GetSize(), SWhite);
d.DrawText(5, 5, stringToDisplay, Arial(48), Black);
}

void DrawCanvas::displayMessage(String s) {
stringToDisplay = s;
Refresh();
}




UppApp.h:
==========================================
#ifndef _UppApp_UppApp_h
#define _UppApp_UppApp_h

#include <CtrlLib/CtrlLib.h>
#include <Painter/Painter.h>
#include "DrawCanvas.h"

using namespace Upp;

#define LAYOUTFILE <UppApp/UppApp.lay>
#include <CtrlCore/lay.h>

class UppApp : public WithUppAppLayout<TopWindow> {
public:
typedef UppApp CLASSNAME;
UppApp();
void displayMessage(String s);

private:
DrawCanvas canvas;
WithButtonLayout<ParentCtrl> buttonPanel;
};

#endif




main.cpp:
==========================================
#include "UppApp.h"

UppApp::UppApp()
{
CtrlLayout(*this, "UppApp");

CtrlLayout(buttonPanel);

buttonPanel.aBtn << THISBACK1(displayMessage, "A");
buttonPanel.bBtn << THISBACK1(displayMessage, "B");
buttonPanel.cBtn << THISBACK1(displayMessage, "C");

Add(buttonPanel);
Add(canvas);
BackPaint();
}

void UppApp::displayMessage(String s) {
canvas.displayMessage(s);
}


GUI_APP_MAIN
{
UppApp uppApp;
uppApp.Run();
}



Re: Attempting to get a canvas to display... [message #47757 is a reply to message #47753] Sun, 19 March 2017 19:24 Go to previous messageGo to next message
omari is currently offline  omari
Messages: 155
Registered: March 2010
Experienced Member
Hi,

You do not specify the size of canvas.
UppApp::UppApp()
{
	CtrlLayout ( *this, "UppApp" );

	canvas.SetRect(100,0, 500, 500 ); // <---- setting the canvas size here
	
	CtrlLayout ( buttonPanel );

	buttonPanel.aBtn << THISBACK1 ( displayMessage, "A" );
	buttonPanel.bBtn << THISBACK1 ( displayMessage, "B" );
	buttonPanel.cBtn << THISBACK1 ( displayMessage, "C" );

	Add ( buttonPanel );
	Add ( canvas );
	BackPaint();
}



regards
omari.
Re: Attempting to get a canvas to display... [message #47761 is a reply to message #47757] Mon, 20 March 2017 02:32 Go to previous messageGo to next message
ptkacz is currently offline  ptkacz
Messages: 29
Registered: March 2017
Promising Member
Thanks Omari.

Interesting how the canvas overwrites the displayed layout depending on what x (the first parameter) is set to.



Peter
Re: Attempting to get a canvas to display... [message #47762 is a reply to message #47761] Mon, 20 March 2017 22:59 Go to previous messageGo to next message
omari is currently offline  omari
Messages: 155
Registered: March 2010
Experienced Member
the canvas overwrites the displayed layout because both are in the same frame.
if you want separate them, you can use Splitter:
class UppApp : public WithUppAppLayout<TopWindow>
{

	public:
		typedef UppApp CLASSNAME;
		UppApp();

		void displayMessage ( String s );

	private:
		DrawCanvas canvas;
		WithButtonLayout<ParentCtrl> buttonPanel;
		Splitter splitter;  // <-------------------------
};


UppApp::UppApp()
{
	CtrlLayout ( *this, "UppApp" );
	
	CtrlLayout ( buttonPanel );

	buttonPanel.aBtn << THISBACK1 ( displayMessage, "A" );
	buttonPanel.bBtn << THISBACK1 ( displayMessage, "B" );
	buttonPanel.cBtn << THISBACK1 ( displayMessage, "C" );

	Add(splitter);  // <-------------------------
	splitter.Horz(buttonPanel,canvas); // <-------------------------
	BackPaint();
}



for more information, you can try this examples :
SplitterFrame
Splitter
Frame


regards
omari.
Re: Attempting to get a canvas to display... [message #47774 is a reply to message #47753] Thu, 23 March 2017 03:08 Go to previous message
ptkacz is currently offline  ptkacz
Messages: 29
Registered: March 2017
Promising Member
Thanks Omari.
Previous Topic: Templates gone missing...
Next Topic: Link error:
Goto Forum:
  


Current Time: Sat Jun 24 19:27:40 CEST 2017

Total time taken to generate the page: 0.05097 seconds