org.eclipse.linuxtools.tmf.ui/src/org/eclipse/linuxtools/tmf/ui/viewers/timeAnalysis/widgets/TraceCtrl.java

   1 /*****************************************************************************
   2  * Copyright (c) 2007, Intel Corporation.
   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 Sanchex-Leon - Udpated for TMF
  12  *
  13  * $Id: TraceCtrl.java,v 1.2 2007/02/27 18:37:36 ewchan Exp $
  14  *****************************************************************************/
  15
  16 package org.eclipse.linuxtools.tmf.ui.viewers.timeAnalysis.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 public abstract class TraceCtrl extends Canvas implements PaintListener {
  27
  28         static public final int MARGIN = 4;
  29         static public final int SMALL_ICON_SIZE = 16;
  30
  31         protected TraceColorScheme _colors;
  32         protected int _fontHeight = 0;
  33
  34         public TraceCtrl(Composite parent, TraceColorScheme colors) {
  35                 this(parent, colors, SWT.NO_BACKGROUND | SWT.NO_FOCUS);
  36         }
  37
  38         public TraceCtrl(Composite parent, TraceColorScheme colors, int style) {
  39                 super(parent, style);
  40                 _colors = colors;
  41                 addPaintListener(this);
  42         }
  43
  44         public void dispose() {
  45                 super.dispose();
  46         }
  47
  48         public void paintControl(PaintEvent e) {
  49                 if (e.widget != this)
  50                         return;
  51                 _fontHeight = e.gc.getFontMetrics().getHeight();
  52                 Rectangle bound = getClientArea();
  53                 if (!bound.isEmpty()) {
  54                         Color colBackup = e.gc.getBackground();
  55                         paint(bound, e);
  56                         e.gc.setBackground(colBackup);
  57                 }
  58         }
  59
  60         public int getFontHeight() {
  61                 return _fontHeight;
  62         }
  63
  64         abstract void paint(Rectangle bound, PaintEvent e);
  65 }