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/*
* java-gnome, a UI library for writing GTK and GNOME programs from Java!
*
* Copyright © 2009-2011 Operational Dynamics Consulting, Pty Ltd and Others
*
* The code in this file, and the program it is a part of, is made available
* to you by its authors as open source software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License version
* 2 ("GPL") as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GPL for more details.
*
* You should have received a copy of the GPL along with this program. If not,
* see http://www.gnu.org/licenses/. The authors of this program may be
* contacted through http://java-gnome.sourceforge.net/.
*/
package sourceview;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import org.gnome.gdk.Event;
import org.gnome.gtk.Gtk;
import org.gnome.gtk.PolicyType;
import org.gnome.gtk.ScrolledWindow;
import org.gnome.gtk.Stock;
import org.gnome.gtk.TextBuffer;
import org.gnome.gtk.ToolButton;
import org.gnome.gtk.Toolbar;
import org.gnome.gtk.VBox;
import org.gnome.gtk.Widget;
import org.gnome.gtk.Window;
import org.gnome.pango.FontDescription;
import org.gnome.sourceview.Language;
import org.gnome.sourceview.LanguageManager;
import org.gnome.sourceview.SourceBuffer;
import org.gnome.sourceview.SourceView;
/**
* A simple text editor demonstrating the GtkSourceView API.
*
* @author Stefan Schweizer
*/
public class ExampleEditor
{
private final SourceView view;
private final SourceBuffer buffer;
private final ToolButton buttonUndo;
private final ToolButton buttonRedo;
private ExampleEditor() {
final Window w;
final VBox x;
final Toolbar toolbar;
final ScrolledWindow scroll;
final LanguageManager manager;
final Language lang;
final FontDescription desc;
w = new Window();
w.setTitle("java-gnome editor");
w.setDefaultSize(550, 600);
w.connect(new Window.DeleteEvent() {
public boolean onDeleteEvent(Widget source, Event event) {
Gtk.mainQuit();
return false;
}
});
x = new VBox(false, 3);
w.add(x);
/*
* Create a toolbar with buttons for undo and redo.
*/
toolbar = new Toolbar();
buttonUndo = new ToolButton(Stock.UNDO);
buttonRedo = new ToolButton(Stock.REDO);
toolbar.add(buttonUndo);
toolbar.add(buttonRedo);
x.packStart(toolbar, false, false, 0);
/*
* Create the SourceBuffer and SourceView. Setup syntax highlighting
* and configure the view to meet our coding standards.
*/
buffer = new SourceBuffer();
manager = LanguageManager.getDefault();
lang = manager.getLanguage("java");
buffer.setLanguage(lang);
view = new SourceView(buffer);
view.setShowLineNumbers(true);
view.setHighlightCurrentLine(true);
view.setShowRightMargin(true);
view.setRightMarginPosition(105);
view.setTabWidth(4);
view.setInsertSpacesInsteadOfTabs(true);
view.setAutoIndent(true);
desc = new FontDescription("Deja Vu Sans Mono, 11");
view.overrideFont(desc);
scroll = new ScrolledWindow();
scroll.setPolicy(PolicyType.AUTOMATIC, PolicyType.ALWAYS);
scroll.add(view);
x.add(scroll);
/*
* Whenever the buffer is changed, recheck if there are actions that
* can be undone or redone. Update the sensivity of the buttons
* accordingly.
*/
buffer.connect(new TextBuffer.Changed() {
public void onChanged(TextBuffer source) {
updateButtons();
}
});
/*
* Connect handlers for undo and redo buttons. It is important to
* check if there is something to undo first to prevent a Gtk
* exception.
*/
buttonUndo.connect(new ToolButton.Clicked() {
public void onClicked(ToolButton source) {
if (buffer.canUndo()) {
buffer.undo();
}
updateButtons();
}
});
buttonRedo.connect(new ToolButton.Clicked() {
public void onClicked(ToolButton source) {
if (buffer.canRedo()) {
buffer.redo();
}
updateButtons();
}
});
w.showAll();
/*
* Load the source file into the editor. The user should not be able
* to undo that, that is why the call to setText() is marked as an
* undoable action.
*/
buffer.beginNotUndoableAction();
buffer.setText(readFile("doc/examples/sourceview/ExampleEditor.java"));
buffer.endNotUndoableAction();
/*
* Move the cursor to the start of the file.
*/
buffer.placeCursor(buffer.getIter(0));
view.grabFocus();
}
private void updateButtons() {
buttonUndo.setSensitive(buffer.canUndo());
buttonRedo.setSensitive(buffer.canRedo());
}
private String readFile(String filename) {
final StringBuilder content;
BufferedReader reader = null;
content = new StringBuilder();
try {
reader = new BufferedReader(new FileReader(filename));
for (int c = reader.read(); c != -1; c = reader.read()) {
content.append((char) c);
}
} catch (IOException ioe) {
content.append(ioe.getMessage());
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
}
}
return content.toString();
}
public static void main(String[] args) {
Gtk.init(args);
new ExampleEditor();
Gtk.main();
}
}
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