Re: [platform-swt-dev] GC.setXORMode on Cocoa

[Silenio Quarti <Silenio_Quarti@xxxxxxxxxx>]

It seems you are implementing a block
caret. Instead of using XOR could you just invert background and foreground
for the character at caret position?

import
org.eclipse.swt.SWT;
import
org.eclipse.swt.graphics.*;
import
org.eclipse.swt.widgets.*;


public
class
CaretTest {
        static
boolean
visible
= true;
public
static
void
main(String[] args) {        
        final
Display display = new
Display();
        final
Shell shell = new
Shell(display, SWT.SHELL_TRIM
| SWT.DOUBLE_BUFFERED);
        
        //Try
other colors
//      
 shell.setForeground(display.getSystemColor(SWT.COLOR_YELLOW));
//      
 shell.setBackground(display.getSystemColor(SWT.COLOR_BLUE));

        shell.setForeground(display.getSystemColor(SWT.COLOR_YELLOW));
        shell.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
        
        Runnable
runnable = new
Runnable() {
         
      public
void
run() {
         
              visible
= !visible;
         
              shell.redraw();
         
              display.timerExec(500,
this);
         
      }
        };
        display.timerExec(500,
runnable);
        
        shell.addListener(SWT.Paint,
new
Listener() {
         
      public
void
handleEvent(Event e) {
         
              GC gc
= e.gc;
         
              Color
backcolor = gc.getBackground();
         
              Color
forecolor = gc.getForeground();
         
              
         
              TextLayout
layout = new
TextLayout(gc.getDevice());
         
              layout.setText("HelloWorld");
         
              if
(visible)
{
         
               
      TextStyle style = new
TextStyle(null,
backcolor, forecolor);
         
               
      layout.setStyle(style, 5, 5);
         
              }
         
              
         
              layout.draw(gc,
10, 10);
         
              layout.dispose();
               
       
         
              
         
              
         
      }
        });
        shell.open();
        while
(!shell.isDisposed()) {
         
      if
(!display.readAndDispatch())
         
              display.sleep();
        }
        display.dispose();
}
}


Silenio

From:	Silenio Quarti/Ottawa/IBM@IBMCA
To:	"Eclipse Platform SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>
Date:	09/30/2009 09:53 AM
Subject:	Re: [platform-swt-dev] GC.setXORMode on Cocoa
Sent by:	platform-swt-dev-bounces@xxxxxxxxxxx

---

I am not sure setXORMode() can be implemented with NSGraphicsContext.  [NSGraphicsContext.setCompositingOperation:NSCompositeXOR]
is a possibility, but I remember it does not work in some situations. Please
open a bug report so that we can investigate. 

Silenio

From:	Dave Smith <dave.smith@xxxxxxxxxxx>
To:	"Eclipse Platform SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>
Date:	09/30/2009 06:36 AM
Subject:	[platform-swt-dev] GC.setXORMode on Cocoa
Sent by:	platform-swt-dev-bounces@xxxxxxxxxxx

---

I have a console based application that needs to display a cursor for the
current position. We use the GC. setXORMode when drawing the cursor so
the 
cursor is the same colour as the text and the text at the cursor position
is changed to a different colour so it is readable.

This works on all platforms (including carbon) except for Cocoa. I know
that this is deprecated so is there a manual way to implement this in Cocoa
?

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