Widget in else clause does not show in Designer

[diltonm]

This may be by design but in this example, button_1 is not visible in Designer 6.9.1.200904040059 on Eclipse 3.4.2 Build M20090211-1700:

Code: Select all

   protected void createContents() {
      shell = new Shell();
      shell.setSize(500, 375);
      shell.setText("SWT Application");

      if (true) {
         final Button button = new Button(shell, SWT.NONE);
         button.setText("button");
         button.setBounds(158, 156, 54, 29);
      
      } else {
         final Button button_1 = new Button(shell, SWT.NONE);
         button_1.setText("button_1");
         button_1.setBounds(158, 221, 54, 29);
         
      }
   }

[Eric Clayberg]

That is definitely by design.

[diltonm]

Thanks it felt a little disconcerting that a visual design tool could have that type and accuracy of introspecting power. I recall using some other tools on other platforms, they tend to have a hard time parsing their own generated code.

The example was simple to show the point, the way I found this was by pasting the code from:
http://dev.eclipse.org/viewcvs/index.cg ... va?view=co

I noticed that there were no visual controls being rendered.

Anyway, thanks for making a great product, you all deserve the awards you receive.

[Eric Clayberg]

In general, any code found within a conditional (or loop) would be considered to be dynamic code (run as the result of some runtime behavior) and not part of the statically defined GUI definition.

[diltonm]

Thanks for the response.

[Eric Clayberg]

There are a couple of exceptions to the conditional rule. The parser will parse into conditions where the conditional test is hard coded to true (as in your example) or does a simple Beans.isDesignTime() test (which is true at design time and false at runtime).

You can also use code hiding tags to change what gets displayed. The following, for example, will cause the second button to be displayed rather than the first:

Code: Select all

   protected void createContents() {
      shell = new Shell();
      shell.setSize(450, 300);
      shell.setText("SWT Application");
      if (true) { //$hide>>$
         final Button button = new Button(shell, SWT.NONE);
         button.setText("button");
         button.setBounds(158, 156, 54, 29);
      } else { //$hide<<$
         final Button button_1 = new Button(shell, SWT.NONE);
         button_1.setText("button_1");
         button_1.setBounds(158, 221, 54, 29);
      }
   }