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

   1 /*****************************************************************************
   2  * Copyright (c) 2007, 2014 Intel Corporation, 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 package org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets;
  16
  17 import org.eclipse.swt.SWT;
  18 import org.eclipse.swt.events.PaintEvent;
  19 import org.eclipse.swt.events.PaintListener;
  20 import org.eclipse.swt.graphics.Color;
  21 import org.eclipse.swt.graphics.Rectangle;
  22 import org.eclipse.swt.widgets.Canvas;
  23 import org.eclipse.swt.widgets.Composite;
  24
  25 /**
  26  * Base control abstract class for the time graph widget
  27  *
  28  * @version 1.0
  29  * @author Alvaro Sanchez-Leon
  30  * @author Patrick Tasse
  31  */
  32 public abstract class TimeGraphBaseControl extends Canvas implements PaintListener {
  33
  34     /** Default left margin size */
  35     public static final int MARGIN = 4;
  36
  37     /** Default expanded size */
  38     public static final int EXPAND_SIZE = 9; // the [+] or [-] control size
  39
  40     /** Default size of the right margin */
  41     public static final int RIGHT_MARGIN = 1; // 1 pixels less to make sure end time is visible
  42
  43     /** Default size for small icons */
  44     public static final int SMALL_ICON_SIZE = 16;
  45
  46     /** Color scheme */
  47     private TimeGraphColorScheme fColorScheme;
  48
  49     /** Font size */
  50     private int fFontHeight = 0;
  51
  52     /**
  53      * Basic constructor. Uses a default style value
  54      *
  55      * @param parent
  56      *            The parent composite object
  57      * @param colors
  58      *            The color scheme to use
  59      */
  60     public TimeGraphBaseControl(Composite parent, TimeGraphColorScheme colors) {
  61         this(parent, colors, SWT.NO_BACKGROUND | SWT.NO_FOCUS);
  62     }
  63
  64     /**
  65      * Standard constructor
  66      *
  67      * @param parent
  68      *            The parent composite object
  69      * @param colorScheme
  70      *            The color scheme to use
  71      * @param style
  72      *            The index of the style to use
  73      */
  74     public TimeGraphBaseControl(Composite parent, TimeGraphColorScheme colorScheme, int style) {
  75         super(parent, style);
  76         fColorScheme = colorScheme;
  77         addPaintListener(this);
  78     }
  79
  80     @Override
  81     public void paintControl(PaintEvent e) {
  82         if (e.widget != this) {
  83             return;
  84         }
  85         fFontHeight = e.gc.getFontMetrics().getHeight();
  86         Rectangle bound = getClientArea();
  87         if (!bound.isEmpty()) {
  88             Color colBackup = e.gc.getBackground();
  89             paint(bound, e);
  90             e.gc.setBackground(colBackup);
  91         }
  92     }
  93
  94     /**
  95      * Retrieve the color scheme
  96      *
  97      * @return The color scheme
  98      */
  99     public TimeGraphColorScheme getColorScheme() {
 100         return fColorScheme;
 101     }
 102
 103     /**
 104      * Retrieve the current font's height
 105      *
 106      * @return The height
 107      */
 108     public int getFontHeight() {
 109         return fFontHeight;
 110     }
 111
 112     abstract void paint(Rectangle bound, PaintEvent e);
 113 }