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
|
/*******************************************************************************
* Copyright (c) 2000, 2005 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.snippets;
import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/*
* Scroll widgets into view when they get focus
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.0
*/
public class Snippet188 {
public static void main (String [] args) {
Display display = new Display ();
Shell shell = new Shell (display);
shell.setLayout(new GridLayout());
Button b1 = new Button(shell, SWT.PUSH);
b1.setText("top");
b1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
final ScrolledComposite sc = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
sc.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
Composite c = new Composite(sc, SWT.NONE);
c.setLayout(new GridLayout(10, true));
for (int i = 0 ; i < 300; i++) {
Button b = new Button(c, SWT.PUSH);
b.setText("Button "+i);
}
Button b2 = new Button(shell, SWT.PUSH);
b2.setText("bottom");
b2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
sc.setContent(c);
sc.setExpandHorizontal(true);
sc.setExpandVertical(true);
sc.setMinSize(c.computeSize(SWT.DEFAULT, SWT.DEFAULT));
Listener listener = new Listener() {
public void handleEvent(Event e) {
Control child = (Control)e.widget;
Rectangle bounds = child.getBounds();
Rectangle area = sc.getClientArea();
Point origin = sc.getOrigin();
if (origin.x > bounds.x) origin.x = Math.max(0, bounds.x);
if (origin.y > bounds.y) origin.y = Math.max(0, bounds.y);
if (origin.x + area.width < bounds.x + bounds.width) origin.x = Math.max(0, bounds.x + bounds.width - area.width);
if (origin.y + area.height < bounds.y + bounds.height) origin.y = Math.max(0, bounds.y + bounds.height - area.height);
sc.setOrigin(origin);
}
};
Control[] controls = c.getChildren();
for (int i = 0; i < controls.length; i++) {
controls[i].addListener(SWT.Activate, listener);
}
shell.setSize(300, 500);
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
|
