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
|
/*******************************************************************************
* Copyright (c) 2000, 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.snippets;
/*
* Table example snippet: draw a custom gradient selection for table
*
* For more info on custom-drawing TableItem and TreeItem content see
* http://www.eclipse.org/articles/article.php?file=Article-CustomDrawingTableAndTreeItems/index.html
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.3
*/
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet229 {
public static void main(String [] args) {
final Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Custom gradient selection for Table");
shell.setLayout(new FillLayout());
final Table table = new Table(shell, SWT.MULTI | SWT.FULL_SELECTION);
table.setHeaderVisible(true);
table.setLinesVisible(true);
int columnCount = 3;
for (int i=0; i<columnCount; i++) {
TableColumn column = new TableColumn(table, SWT.NONE);
column.setText("Column " + i);
}
int itemCount = 8;
for(int i = 0; i < itemCount; i++) {
TableItem item = new TableItem(table, SWT.NONE);
item.setText(new String[] {"item "+i+" a", "item "+i+" b", "item "+i+" c"});
}
/*
* NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
* Therefore, it is critical for performance that these methods be
* as efficient as possible.
*/
table.addListener(SWT.EraseItem, event -> {
event.detail &= ~SWT.HOT;
if((event.detail & SWT.SELECTED) != 0) {
GC gc = event.gc;
Rectangle area = table.getClientArea();
/*
* If you wish to paint the selection beyond the end of
* last column, you must change the clipping region.
*/
int columnCount1 = table.getColumnCount();
if (event.index == columnCount1 - 1 || columnCount1 == 0) {
int width = area.x + area.width - event.x;
if (width > 0) {
Region region = new Region();
gc.getClipping(region);
region.add(event.x, event.y, width, event.height);
gc.setClipping(region);
region.dispose();
}
}
gc.setAdvanced(true);
if (gc.getAdvanced()) gc.setAlpha(127);
Rectangle rect = event.getBounds();
Color foreground = gc.getForeground();
Color background = gc.getBackground();
gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
gc.setBackground(display.getSystemColor(SWT.COLOR_LIST_BACKGROUND));
gc.fillGradientRectangle(0, rect.y, 500, rect.height, false);
// restore colors for subsequent drawing
gc.setForeground(foreground);
gc.setBackground(background);
event.detail &= ~SWT.SELECTED;
}
});
for (int i=0; i<columnCount; i++) {
table.getColumn(i).pack();
}
table.setSelection(table.getItem(0));
shell.setSize(500, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
|
