Question

I am implementing a on screen keyboard in Java for SWT and AWT. One important thing is to move the keyboard to a position where the selected text field can show and is not lying behind the on screen keyboard.

For AWT i can detect the position of the current selected component with

Component owner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner(); if (owner == null) {     return; } Point ownerLocation = owner.getLocationOnScreen(); Dimension ownerSize = owner.getSize(); 

How can i implement the same logic in SWT? I get the current selected widget by adding a focuslistener to the SWT event queue. But when i call

Point location = new Point(mTextWidget.getLocation().x, mTextWidget.getLocation().y); Dimension dimension = new Dimension(mTextWidget.getSize().x, mTextWidget.getSize().y); 

I will get the position relativ to the parent composite.

How can i get the location of a special widget relativ to the complete screen?

Answer 1

I believe the method Control.toDisplay() should be able to translate your coordinates into ones relative to the screen.

This snippet may illustrate what you are after:

package org.eclipse.jface.snippets;  import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text;  public class Bla {     public static void main(String[] args) {         Display display = new Display();         Shell shell = new Shell(display);          final Text t = new Text(shell,SWT.BORDER);         t.setBounds(new Rectangle(10,10,200,30));         System.err.println(t.toDisplay(1, 1));          Button b = new Button(shell,SWT.PUSH);         b.setText('Show size');         b.setBounds(new Rectangle(220,10,100,20));         b.addSelectionListener(new SelectionAdapter() {              public void widgetSelected(SelectionEvent e) {                 System.err.println(t.toDisplay(1, 1));              }          });          shell.open();          while (!shell.isDisposed()) {             if (!display.readAndDispatch())                 display.sleep();         }          display.dispose();     } }