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How to change text when program is running? [message #464308]

Mon, 21 November 2005 10:19

Robin

Messages: 7
Registered: July 2009

Junior Member

For example, I want to change text "11111111111111" to "22222222222" after
the shell is shown. I run "test.getText().setText("22222222222")" after
test.creatShell(), but it does not work because the program is in the
while loop and test.getText().setText("22222222222") will never run till
the display disposed. So anyone have idea how to do it? Below is the code.

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class Test {

public Text text;

public void creatShell(){
Display display = Display.getDefault();
Shell shell = new Shell(SWT.MIN);

text=new Text(shell,SWT.MULTI|SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
text.setBounds(50,40,300,200);
text.setText("11111111111111");
shell.pack();

shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}

display.dispose();

}

public static void main(String[] args){

Test test=new Test();
test.creatShell();
test.getText().setText("22222222222");

}

public Text getText(){
return this.text;
}

}

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Re: How to change text when program is running? [message #464315 is a reply to message #464308]

Mon, 21 November 2005 14:00

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Add a button as well, and put your code in a SelectionListener on the
button.

later,
PW

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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Re: How to change text when program is running? [message #464317 is a reply to message #464315]

Mon, 21 November 2005 14:47

Robin

Messages: 7
Registered: July 2009

Junior Member

But I dont want to add a button. I want other classes can change text
after the shell is shown.
thanks,

robin

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Re: How to change text when program is running? [message #464318 is a reply to message #464317]

Mon, 21 November 2005 14:56

Stefan Langer

Messages: 236
Registered: July 2009

Senior Member

You have to run the code that sets the text from a different thread than
the ui thread or who ever changes the text has to be part of the ui
thread and does this during handling a ui event message.
Beware that when you update the eventthread from a different thread use
synExec or asynExec from Display.

Regards
Stefan

Robin wrote:
> But I dont want to add a button. I want other classes can change text
> after the shell is shown.
> thanks,
>
> robin
>

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Re: How to change text when program is running? [message #464360 is a reply to message #464318]

Tue, 22 November 2005 03:48

Robin

Messages: 7
Registered: July 2009

Junior Member

hi Stefan,

Thanks for your explaination.
I think you meaning is to start "another" thread in UI thread to do some
action. But this "another" thread must be put into a event handler code in
the UI thread.

But I think I also need something( a button or something else) to trigger
the "another" thread ??

regards,

Robin

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