how to place other Widgets (ie.Label,Button) on Sash? urgent

[jackyustb]

Now i'm coding with SWT/JFace.
I wanna show text message and add button on Sash (org.eclipse.swt.widgets.Sash),how to do?

[Konstantin.Scheglov]

You don't want to use Sash, you should use SashForm.
Just first widget on it, then:
1. drop second in Tree
2. or select SashForm and drop second widget near to the border of SashForm. A little tricky, but SashForm fill itself with children widgets, so you need special way for dropping new children.

[jackyustb]

i hope to show some tip messages on sash in a sashform which contains two children ,one is Tableview on its top, another is Text on its bottom. the sash in the middle separate them.
When i select one item in the Tableview,i wanna show the item's main content in the Text widget and tip message on the sash.
how to do?

You don't want to use Sash, you should use SashForm.
Just first widget on it, then:
1. drop second in Tree
2. or select SashForm and drop second widget near to the border of SashForm. A little tricky, but SashForm fill itself with children widgets, so you need special way for dropping new children.

[Eric Clayberg]

i hope to show some tip messages on sash in a sashform which contains two children ,one is Tableview on its top, another is Text on its bottom. the sash in the middle separate them.
When i select one item in the Tableview,i wanna show the item's main content in the Text widget and tip message on the sash.
how to do?

You would need to get the children of the SashForm, find the Sash widget and then set its tooltip using setToolTipText().

General questions about using SWT should be posted to the Eclipse SWT newsgroup.

[jackyustb]

i hope to show some tip messages on sash in a sashform which contains two children ,one is Tableview on its top, another is Text on its bottom. the sash in the middle separate them.
When i select one item in the Tableview,i wanna show the item's main content in the Text widget and tip message on the sash.
how to do?

You would need to get the children of the SashForm, find the Sash widget and then set its tooltip using setToolTipText().

General questions about using SWT should be posted to the Eclipse SWT newsgroup.

Children of the SashForm contains the Sash?

[Eric Clayberg]

Children of the SashForm contains the Sash?

Yes.

[Makaron]

Children of the SashForm contains the Sash?

Yes.

Sorry, but the children of SashForm don't contain the Sash: consider the following example

http://www.java2s.com/Code/Java/SWT-JFace-Eclipse/DemonstratesSashForm.htm

which I modified only slightly, to see, if the SashForm's children contain the Sash, but it seems that only the two Buttons are children of SashForm. Here is
the modified code:

Code: Select all


import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.*;

/**
* This class demonstrates SashForm
*/
public class SashFormTest {
  /**
   * Runs the application
   */
  public void run() {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("SashForm Test");
    createContents(shell);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }

  /**
   * Creates the main window's contents
   *
   * @param parent the parent window
   */
  private void createContents(Composite parent) {
    // Fill the parent window with the buttons and sash
    parent.setLayout(new FillLayout());

    // Create the SashForm and the buttons
    SashForm sashForm = new SashForm(parent, SWT.HORIZONTAL);
    new Button(sashForm, SWT.PUSH).setText("Left");
    new Button(sashForm, SWT.PUSH).setText("Right");
   

    // This is the part, where the children of SashForm are printed out:
    Control[] controls = sashForm.getChildren();   
   
    for (Control control : controls)
    {
        System.out.println(control.getClass().getName());
    }
   
  }

  /**
   * The application entry point
   *
   * @param args the command line arguments
   */
  public static void main(String[] args) {
    new SashFormTest().run();
  }
}


Or maybe I'm missing something...


Have a nice day

[Eric Clayberg]

First of all, let me reiterate that general questions about SWT should be posted to the Eclipse SWT newsgroup.

Sorry, but the children of SashForm don't contain the Sash

I'm sorry, but that is incorrect. The children of the SashForm most certainly include one or more Sash instances.

consider the following example

That is not a relevant example for showing what the actual children of a SashForm are.

Or maybe I'm missing something

Yes. As is always the case with a question like this, you should start by looking at the actual implementation of the SashForm class itself. There you will see quite clearly that a SashForm includes one or more Sash widgets and that they are all held in the sashes field.

[Makaron]

First of all, let me reiterate that general questions about SWT should be posted to the Eclipse SWT newsgroup.

I apologize for posting here, but this is a problem which really puzzles me. I need to get a Sash instance from SashForm to limit maximum width of a Composite in a SashForm (I have two Composites that reside on a SashForm). I read about how to do this here:

http://gretchenmoran.blogspot.com/2008/ ... nt-on.html

Or maybe I'm missing something

Yes. As is always the case with a question like this, you should start by looking at the actual implementation of the SashForm class itself. There you will see quite clearly that a SashForm includes one or more Sash widgets and that they are all held in the sashes field.

I looked at the SashForm implementation and there's indeed private field sashes, but I don't know how to get Sash instances from it; the method SashForm.getChildren() obviously doesn't return any Sash objects.


Have a nice day,

A.

[Eric Clayberg]

I looked at the SashForm implementation and there's indeed private field sashes, but I don't know how to get Sash instances from it; the method SashForm.getChildren() obviously doesn't return any Sash objects.

Very easy using reflection...

Code: Select all

import java.lang.reflect.Field;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.widgets.Sash;

public class SashFormHelper {
   public static Sash[] getSashes(SashForm sf) {
      final Field fields[] = sf.getClass().getDeclaredFields();
      for (int i = 0; i < fields.length; ++i) {
         if ("sashes".equals(fields[i].getName())) {
            try {
               fields[i].setAccessible(true);
               return (Sash[]) fields[i].get(sf);
            } catch (IllegalAccessException ex) {
            }
         }
      }
      return null;
   }
}

And then to modify your example...

Code: Select all

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.*;

/**
* This class demonstrates SashForm
*/
public class SashFormTest {
   public SashForm sashForm;

   /**
    * Runs the application
    */
   public void run() {
      Display display = new Display();
      Shell shell = new Shell(display);
      shell.setText("SashForm Test");
      createContents(shell);
      shell.open();

      // This is the part, where the children of SashForm are printed out:
      Control[] controls = sashForm.getChildren();
      for (Control control : controls) {
         System.out.println(control.getClass().getName());
      }

      // Note that Sashes don't exist until the window is open
      Sash[] sashes = SashFormHelper.getSashes(sashForm);
      for (Sash sash : sashes) {
         sash.setToolTipText("I am a Sash");
         System.out.println(sash.getClass().getName());
      }

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

   /**
    * Creates the main window's contents
    *
    * @param parent
    *            the parent window
    */
   private void createContents(Composite parent) {
      // Fill the parent window with the buttons and sash
      parent.setLayout(new FillLayout());

      // Create the SashForm and the buttons
      sashForm = new SashForm(parent, SWT.HORIZONTAL);
      new Button(sashForm, SWT.PUSH).setText("Left");
      new Button(sashForm, SWT.PUSH).setText("Right");
   }

   /**
    * The application entry point
    *
    * @param args
    *            the command line arguments
    */
   public static void main(String[] args) {
      new SashFormTest().run();
   }
}

[Makaron]

I looked at the SashForm implementation and there's indeed private field sashes, but I don't know how to get Sash instances from it; the method SashForm.getChildren() obviously doesn't return any Sash objects.

Very easy using reflection...

Thank you very much, this solution really works, you saved my day.

I wasn't aware of the getClass().getDeclaredFields() method, I still have to learn much Java. But now I understand one new concept, namely, how to get to the private fields - thanks to you being so kind.

Best regards,

A.

[Eric Clayberg]

Thank you very much, this solution really works, you saved my day.

You're welcome. You should also check out the eclipse.platform.swt newsgroup as teh best place to ask most SWT-related questions.

I wasn't aware of the getClass().getDeclaredFields() method.

Java reflection can be a lot of fun. It's like the extra key hidden under the mat that will get you into almost any locked door.