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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*******************************************************************************
* Copyright (c) 2000, 2007 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.javaviewer;
import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import java.util.*;
import java.io.*;
import java.text.*;
/**
*/
public class JavaViewer {
Shell shell;
StyledText text;
JavaLineStyler lineStyler = new JavaLineStyler();
FileDialog fileDialog;
static ResourceBundle resources = ResourceBundle.getBundle("examples_javaviewer");
Menu createFileMenu() {
Menu bar = shell.getMenuBar ();
Menu menu = new Menu (bar);
MenuItem item;
// Open
item = new MenuItem (menu, SWT.PUSH);
item.setText (resources.getString("Open_menuitem"));
item.setAccelerator(SWT.MOD1 + 'O');
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
openFile();
}
});
// Exit
item = new MenuItem (menu, SWT.PUSH);
item.setText (resources.getString("Exit_menuitem"));
item.addSelectionListener (new SelectionAdapter () {
public void widgetSelected (SelectionEvent e) {
menuFileExit ();
}
});
return menu;
}
void createMenuBar () {
Menu bar = new Menu (shell, SWT.BAR);
shell.setMenuBar (bar);
MenuItem fileItem = new MenuItem (bar, SWT.CASCADE);
fileItem.setText (resources.getString("File_menuitem"));
fileItem.setMenu (createFileMenu ());
}
void createShell (Display display) {
shell = new Shell (display);
shell.setText (resources.getString("Window_title"));
GridLayout layout = new GridLayout();
layout.numColumns = 1;
shell.setLayout(layout);
shell.addShellListener (new ShellAdapter () {
public void shellClosed (ShellEvent e) {
lineStyler.disposeColors();
text.removeLineStyleListener(lineStyler);
}
});
}
void createStyledText() {
text = new StyledText (shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL);
GridData spec = new GridData();
spec.horizontalAlignment = GridData.FILL;
spec.grabExcessHorizontalSpace = true;
spec.verticalAlignment = GridData.FILL;
spec.grabExcessVerticalSpace = true;
text.setLayoutData(spec);
text.addLineStyleListener(lineStyler);
text.setEditable(false);
Color bg = Display.getDefault().getSystemColor(SWT.COLOR_GRAY);
text.setBackground(bg);
}
void displayError(String msg) {
MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
box.setMessage(msg);
box.open();
}
public static void main (String [] args) {
Display display = new Display();
JavaViewer example = new JavaViewer ();
Shell shell = example.open (display);
while (!shell.isDisposed ())
if (!display.readAndDispatch ()) display.sleep ();
display.dispose ();
}
public Shell open (Display display) {
createShell (display);
createMenuBar ();
createStyledText ();
shell.setSize(500, 400);
shell.open ();
return shell;
}
void openFile() {
if (fileDialog == null) {
fileDialog = new FileDialog(shell, SWT.OPEN);
}
fileDialog.setFilterExtensions(new String[] {"*.java", "*.*"});
String name = fileDialog.open();
open(name);
}
void open(String name) {
final String textString;
if ((name == null) || (name.length() == 0)) return;
File file = new File(name);
if (!file.exists()) {
String message = MessageFormat.format(resources.getString("Err_file_no_exist"), new String[] {file.getName()});
displayError(message);
return;
}
try {
FileInputStream stream= new FileInputStream(file.getPath());
try {
Reader in = new BufferedReader(new InputStreamReader(stream));
char[] readBuffer= new char[2048];
StringBuffer buffer= new StringBuffer((int) file.length());
int n;
while ((n = in.read(readBuffer)) > 0) {
buffer.append(readBuffer, 0, n);
}
textString = buffer.toString();
stream.close();
}
catch (IOException e) {
// Err_file_io
String message = MessageFormat.format(resources.getString("Err_file_io"), new String[] {file.getName()});
displayError(message);
return;
}
}
catch (FileNotFoundException e) {
String message = MessageFormat.format(resources.getString("Err_not_found"), new String[] {file.getName()});
displayError(message);
return;
}
// Guard against superfluous mouse move events -- defer action until later
Display display = text.getDisplay();
display.asyncExec(new Runnable() {
public void run() {
text.setText(textString);
}
});
// parse the block comments up front since block comments can go across
// lines - inefficient way of doing this
lineStyler.parseBlockComments(textString);
}
void menuFileExit () {
shell.close ();
}
}
|
