发现屏幕上的位置，复合 [英] Find composite location on screen

问题描述

我屏幕键盘在Java中的SWT和AWT上实施。
一个重要的事情是将键盘移动到一个位置，所选文本字段可以显示和不撒谎背后的屏幕键盘上。

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.

有关AWT我可以检测当前所选组件的位置

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();

我如何能实现在SWT相同的逻辑？
我加入了的FocusListener的SWT事件队列获得当前选定的部件。但是，当我打电话

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);

我会得到的位置relativ父复合材料。

I will get the position relativ to the parent composite.

我怎样才能得到一个特殊的小部件relativ的位置，完整的画面？

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

推荐答案

我相信法<一个href=\"http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse.platform.doc.isv/reference/api/org/eclipse/swt/graphics/class-use/Point.html\">Control.toDisplay()应该能够将您的坐标转换成那些相对于屏幕。

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

这片段可能说明你是什么后：

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();
    }
}

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