org.eclipse.linuxtools.tmf.ui/src/org/eclipse/linuxtools/tmf/ui/widgets/timegraph/widgets/TimeGraphBaseControl.java

   1 /*****************************************************************************
   2  * Copyright (c) 2007 Intel Corporation, 2009, 2012 Ericsson.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *   Intel Corporation - Initial API and implementation
  10  *   Ruslan A. Scherbakov, Intel - Initial API and implementation
  11  *   Alvaro Sanchez-Leon - Updated for TMF
  12  *   Patrick Tasse - Refactoring
  13  *
  14  *****************************************************************************/
  15
  16 package org.eclipse.linuxtools.tmf.ui.widgets.timegraph.widgets;
  17
  18 import org.eclipse.swt.SWT;
  19 import org.eclipse.swt.events.PaintEvent;
  20 import org.eclipse.swt.events.PaintListener;
  21 import org.eclipse.swt.graphics.Color;
  22 import org.eclipse.swt.graphics.Rectangle;
  23 import org.eclipse.swt.widgets.Canvas;
  24 import org.eclipse.swt.widgets.Composite;
  25
  26 /**
  27  * Base control abstract class for the time graph widget
  28  *
  29  * @version 1.0
  30  * @author Alvaro Sanchez-Leon
  31  * @author Patrick Tasse
  32  */
  33 public abstract class TimeGraphBaseControl extends Canvas implements PaintListener {
  34
  35     static public final int MARGIN = 4;
  36     static public final int EXPAND_SIZE = 9; // the [+] or [-] control size
  37     static public final int RIGHT_MARGIN = 1; // 1 pixels less to make sure end time is visible
  38     static public final int SMALL_ICON_SIZE = 16;
  39
  40     protected TimeGraphColorScheme _colors;
  41     protected int _fontHeight = 0;
  42
  43     public TimeGraphBaseControl(Composite parent, TimeGraphColorScheme colors) {
  44         this(parent, colors, SWT.NO_BACKGROUND | SWT.NO_FOCUS);
  45     }
  46
  47     public TimeGraphBaseControl(Composite parent, TimeGraphColorScheme colors, int style) {
  48         super(parent, style);
  49         _colors = colors;
  50         addPaintListener(this);
  51     }
  52
  53     @Override
  54     public void dispose() {
  55         super.dispose();
  56     }
  57
  58     @Override
  59     public void paintControl(PaintEvent e) {
  60         if (e.widget != this) {
  61             return;
  62         }
  63         _fontHeight = e.gc.getFontMetrics().getHeight();
  64         Rectangle bound = getClientArea();
  65         if (!bound.isEmpty()) {
  66             Color colBackup = e.gc.getBackground();
  67             paint(bound, e);
  68             e.gc.setBackground(colBackup);
  69         }
  70     }
  71
  72     public int getFontHeight() {
  73         return _fontHeight;
  74     }
  75
  76     abstract void paint(Rectangle bound, PaintEvent e);
  77 }