1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*******************************************************************************
* Copyright (c) 2016 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.swt.examples.graphics;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Spinner;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
/**
* This class extends the GraphicsTab class to create animated graphics.
* */
public abstract class AnimatedGraphicsTab extends GraphicsTab {
ToolBar toolBar;
ToolItem playItem, pauseItem;
Spinner timerSpinner; // to input the speed of the animation
private boolean animate; // flag that indicates whether or not to animate the graphic
public AnimatedGraphicsTab(GraphicsExample example) {
super(example);
animate = true;
}
/**
* Sets the layout of the composite to RowLayout and creates the toolbar.
*
* @see org.eclipse.swt.examples.graphics.GraphicsTab#createControlPanel(org.eclipse.swt.widgets.Composite)
*/
@Override
public void createControlPanel(Composite parent) {
// setup layout
RowLayout layout = new RowLayout();
layout.wrap = true;
layout.spacing = 8;
parent.setLayout(layout);
createToolBar(parent);
}
/**
* Creates the toolbar controls: play, pause and animation timer.
*
* @param parent A composite
*/
void createToolBar(final Composite parent) {
final Display display = parent.getDisplay();
toolBar = new ToolBar(parent, SWT.FLAT);
Listener toolBarListener = event -> {
switch (event.type) {
case SWT.Selection: {
if (event.widget == playItem) {
animate = true;
playItem.setEnabled(!animate);
pauseItem.setEnabled(animate);
} else if (event.widget == pauseItem) {
animate = false;
playItem.setEnabled(!animate);
pauseItem.setEnabled(animate);
}
}
break;
}
};
// play tool item
playItem = new ToolItem(toolBar, SWT.PUSH);
playItem.setText(GraphicsExample.getResourceString("Play")); //$NON-NLS-1$
playItem.setImage(example.loadImage(display, "play.gif")); //$NON-NLS-1$
playItem.addListener(SWT.Selection, toolBarListener);
// pause tool item
pauseItem = new ToolItem(toolBar, SWT.PUSH);
pauseItem.setText(GraphicsExample.getResourceString("Pause")); //$NON-NLS-1$
pauseItem.setImage(example.loadImage(display, "pause.gif")); //$NON-NLS-1$
pauseItem.addListener(SWT.Selection, toolBarListener);
// timer spinner
Composite comp = new Composite(parent, SWT.NONE);
GridLayout gridLayout = new GridLayout(2, false);
comp.setLayout(gridLayout);
Label label = new Label(comp, SWT.CENTER);
label.setText(GraphicsExample.getResourceString("Animation")); //$NON-NLS-1$
timerSpinner = new Spinner(comp, SWT.BORDER | SWT.WRAP);
timerSpinner.setMaximum(1000);
playItem.setEnabled(false);
animate = true;
timerSpinner.setSelection(getInitialAnimationTime());
}
/**
* Answer whether the receiver's drawing should be double bufferer.
*/
@Override
public boolean getDoubleBuffered() {
return true;
}
/**
* Gets the initial animation time to be used by the tab. Animation time:
* number of milliseconds between the current drawing and the next (the time
* interval between calls to the next method). Should be overridden to
* return a value that is more appropriate for the tab.
*/
public int getInitialAnimationTime() {
return 30;
}
/**
* Gets the animation time that is selected in the spinner. Animation time:
* number of milliseconds between the current drawing and the next (the time
* interval between calls to the next method). Should be overridden to
* return a value that is more appropriate for the tab.
*/
public int getAnimationTime() {
return timerSpinner.getSelection();
}
/**
* Returns the true if the tab is currently animated; false otherwise.
*/
public boolean getAnimation() {
return animate;
}
/**
* Causes the animation to stop or start.
*
* @param flag
* true starts the animation; false stops the animation.
*/
public void setAnimation(boolean flag) {
animate = flag;
playItem.setEnabled(!flag);
pauseItem.setEnabled(flag);
}
/**
* Advance the animation.
*/
public abstract void next(int width, int height);
}
|
