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/*******************************************************************************
* Copyright (c) 2013 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.releng.tools.preferences;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.events.MouseTrackAdapter;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
/**
* General functions useful to all widgets that create preference blocks
*
* @since 3.8
*/
public abstract class ConfigurationBlock {
private static final int HIGHLIGHT_FOCUS = SWT.COLOR_WIDGET_DARK_SHADOW;
private static final int HIGHLIGHT_MOUSE = SWT.COLOR_WIDGET_NORMAL_SHADOW;
private static final int HIGHLIGHT_NONE = SWT.NONE;
protected void addHighlight(final Composite parent, final Label labelControl, final Combo comboBox) {
comboBox.addFocusListener(new FocusListener() {
public void focusLost(FocusEvent e) {
highlight(parent, labelControl, comboBox, HIGHLIGHT_NONE);
}
public void focusGained(FocusEvent e) {
highlight(parent, labelControl, comboBox, HIGHLIGHT_FOCUS);
}
});
MouseTrackAdapter labelComboListener= new MouseTrackAdapter() {
public void mouseEnter(MouseEvent e) {
highlight(parent, labelControl, comboBox, comboBox.isFocusControl() ? HIGHLIGHT_FOCUS : HIGHLIGHT_MOUSE);
}
public void mouseExit(MouseEvent e) {
if (! comboBox.isFocusControl())
highlight(parent, labelControl, comboBox, HIGHLIGHT_NONE);
}
};
comboBox.addMouseTrackListener(labelComboListener);
labelControl.addMouseTrackListener(labelComboListener);
class MouseMoveTrackListener extends MouseTrackAdapter implements MouseMoveListener, MouseListener {
public void mouseExit(MouseEvent e) {
if (! comboBox.isFocusControl())
highlight(parent, labelControl, comboBox, HIGHLIGHT_NONE);
}
public void mouseMove(MouseEvent e) {
int color= comboBox.isFocusControl() ? HIGHLIGHT_FOCUS : isAroundLabel(e) ? HIGHLIGHT_MOUSE : HIGHLIGHT_NONE;
highlight(parent, labelControl, comboBox, color);
}
public void mouseDown(MouseEvent e) {
if (isAroundLabel(e))
comboBox.setFocus();
}
public void mouseDoubleClick(MouseEvent e) {
// not used
}
public void mouseUp(MouseEvent e) {
// not used
}
private boolean isAroundLabel(MouseEvent e) {
int lx= labelControl.getLocation().x;
Rectangle c= comboBox.getBounds();
int x= e.x;
int y= e.y;
boolean isAroundLabel= lx - 5 < x && x < c.x && c.y - 2 < y && y < c.y + c.height + 2;
return isAroundLabel;
}
}
MouseMoveTrackListener parentListener= new MouseMoveTrackListener();
parent.addMouseMoveListener(parentListener);
parent.addMouseTrackListener(parentListener);
parent.addMouseListener(parentListener);
MouseAdapter labelClickListener= new MouseAdapter() {
public void mouseDown(MouseEvent e) {
comboBox.setFocus();
}
};
labelControl.addMouseListener(labelClickListener);
}
protected void highlight(final Composite parent, final Label labelControl, final Combo comboBox, final int color) {
class HighlightPainter implements PaintListener {
private int fColor= color;
public void paintControl(PaintEvent e) {
if (((GridData) labelControl.getLayoutData()).exclude) {
parent.removePaintListener(this);
labelControl.setData(null);
return;
}
int GAP= 7;
int ARROW= 3;
Rectangle l= labelControl.getBounds();
Point c= comboBox.getLocation();
e.gc.setForeground(e.display.getSystemColor(fColor));
int x2= c.x - GAP;
int y= l.y + l.height / 2 + 1;
e.gc.drawLine(l.x + l.width + GAP, y, x2, y);
e.gc.drawLine(x2 - ARROW, y - ARROW, x2, y);
e.gc.drawLine(x2 - ARROW, y + ARROW, x2, y);
}
}
Object data= labelControl.getData();
if (data == null) {
if (color != HIGHLIGHT_NONE) {
PaintListener painter= new HighlightPainter();
parent.addPaintListener(painter);
labelControl.setData(painter);
} else {
return;
}
} else {
if (color == HIGHLIGHT_NONE) {
parent.removePaintListener((PaintListener) data);
labelControl.setData(null);
} else if (color != ((HighlightPainter) data).fColor){
((HighlightPainter) data).fColor= color;
} else {
return;
}
}
parent.redraw();
parent.update();
}
}
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