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swt demo example text editor (simple text editor). originally from http://www.java2s.com/Code/Java/SWT-JFace-Eclipse/SWTTextEditorDemo.htm
// first download the swt jar, in this instance to "swt/win32.jar"
// then compile like javac -cp swt/win32.jar TextEditor.java
// then run like java -cp .;swt/win32.jar TextEditor
import java.io.IOException;
import java.io.InputStream;
import java.util.ResourceBundle;
import java.util.Vector;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ExtendedModifyEvent;
import org.eclipse.swt.custom.ExtendedModifyListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FontDialog;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
import org.eclipse.swt.widgets.Widget;
/**
*/
public class TextEditor {
/*******************************************************************************
* Copyright (c) 2000, 2004 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
******************************************************************************/
Shell shell;
ToolBar toolBar;
StyledText text;
Vector cachedStyles = new Vector();
Color RED = null;
Color BLUE = null;
Color GREEN = null;
Font font = null;
ToolItem boldButton, italicButton, underlineButton, strikeoutButton;
Menu createEditMenu() {
Menu bar = shell.getMenuBar();
Menu menu = new Menu(bar);
MenuItem item = new MenuItem(menu, SWT.PUSH);
item.setText("Cut_menuitem");
item.setAccelerator(SWT.MOD1 + 'X');
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
handleCutCopy();
text.cut();
}
});
item = new MenuItem(menu, SWT.PUSH);
item.setText("Copy_menuitem");
item.setAccelerator(SWT.MOD1 + 'C');
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
handleCutCopy();
text.copy();
}
});
item = new MenuItem(menu, SWT.PUSH);
item.setText("Paste_menuitem");
item.setAccelerator(SWT.MOD1 + 'V');
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
text.paste();
}
});
new MenuItem(menu, SWT.SEPARATOR);
item = new MenuItem(menu, SWT.PUSH);
item.setText("Font_menuitem");
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
setFont();
}
});
return menu;
}
Menu createFileMenu() {
Menu bar = shell.getMenuBar();
Menu menu = new Menu(bar);
MenuItem item = new MenuItem(menu, SWT.PUSH);
item.setText("Exit_menuitem");
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
shell.close();
}
});
return menu;
}
/*
* Set a style
*/
void setStyle(Widget widget) {
Point sel = text.getSelectionRange();
if ((sel == null) || (sel.y == 0))
return;
StyleRange style;
for (int i = sel.x; i < sel.x + sel.y; i++) {
StyleRange range = text.getStyleRangeAtOffset(i);
if (range != null) {
style = (StyleRange) range.clone();
style.start = i;
style.length = 1;
} else {
style = new StyleRange(i, 1, null, null, SWT.NORMAL);
}
if (widget == boldButton) {
style.fontStyle ^= SWT.BOLD;
} else if (widget == italicButton) {
style.fontStyle ^= SWT.ITALIC;
} else if (widget == underlineButton) {
style.underline = !style.underline;
} else if (widget == strikeoutButton) {
style.strikeout = !style.strikeout;
}
text.setStyleRange(style);
}
text.setSelectionRange(sel.x + sel.y, 0);
}
/*
* Clear all style data for the selected text.
*/
void clear() {
Point sel = text.getSelectionRange();
if ((sel != null) && (sel.y != 0)) {
StyleRange style;
style = new StyleRange(sel.x, sel.y, null, null, SWT.NORMAL);
text.setStyleRange(style);
}
text.setSelectionRange(sel.x + sel.y, 0);
}
/*
* Set the foreground color for the selected text.
*/
void fgColor(Color fg) {
Point sel = text.getSelectionRange();
if ((sel == null) || (sel.y == 0))
return;
StyleRange style, range;
for (int i = sel.x; i < sel.x + sel.y; i++) {
range = text.getStyleRangeAtOffset(i);
if (range != null) {
style = (StyleRange) range.clone();
style.start = i;
style.length = 1;
style.foreground = fg;
} else {
style = new StyleRange(i, 1, fg, null, SWT.NORMAL);
}
text.setStyleRange(style);
}
text.setSelectionRange(sel.x + sel.y, 0);
}
void createMenuBar() {
Menu bar = new Menu(shell, SWT.BAR);
shell.setMenuBar(bar);
MenuItem fileItem = new MenuItem(bar, SWT.CASCADE);
fileItem.setText("File_menuitem");
fileItem.setMenu(createFileMenu());
MenuItem editItem = new MenuItem(bar, SWT.CASCADE);
editItem.setText("edit");
editItem.setMenu(createEditMenu());
}
void createShell(Display display) {
shell = new Shell(display);
shell.setText("Window");
GridLayout layout = new GridLayout();
layout.numColumns = 1;
shell.setLayout(layout);
shell.addDisposeListener(new DisposeListener() {
public void widgetDisposed(DisposeEvent e) {
if (font != null)
font.dispose();
RED.dispose();
GREEN.dispose();
BLUE.dispose();
}
});
}
void createStyledText() {
initializeColors();
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.addExtendedModifyListener(new ExtendedModifyListener() {
public void modifyText(ExtendedModifyEvent e) {
handleExtendedModify(e);
}
});
}
void createToolBar() {
toolBar = new ToolBar(shell, SWT.NULL);
SelectionAdapter listener = new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
setStyle(event.widget);
}
};
boldButton = new ToolItem(toolBar, SWT.CHECK);
boldButton.setToolTipText("Bold");
boldButton.addSelectionListener(listener);
italicButton = new ToolItem(toolBar, SWT.CHECK);
italicButton.setToolTipText("Italic");
italicButton.addSelectionListener(listener);
underlineButton = new ToolItem(toolBar, SWT.CHECK);
underlineButton.setToolTipText("Underline");
underlineButton.addSelectionListener(listener);
strikeoutButton = new ToolItem(toolBar, SWT.CHECK);
strikeoutButton.setToolTipText("Strikeout");
strikeoutButton.addSelectionListener(listener);
ToolItem item = new ToolItem(toolBar, SWT.SEPARATOR);
item = new ToolItem(toolBar, SWT.PUSH);
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
fgColor(RED);
}
});
item = new ToolItem(toolBar, SWT.PUSH);
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
fgColor(GREEN);
}
});
item = new ToolItem(toolBar, SWT.PUSH);
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
fgColor(BLUE);
}
});
item = new ToolItem(toolBar, SWT.SEPARATOR);
item = new ToolItem(toolBar, SWT.PUSH);
item.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
clear();
}
});
}
/*
* Cache the style information for text that has been cut or copied.
*/
void handleCutCopy() {
// Save the cut/copied style info so that during paste we will maintain
// the style information. Cut/copied text is put in the clipboard in
// RTF format, but is not pasted in RTF format. The other way to
// handle the pasting of styles would be to access the Clipboard
// directly and
// parse the RTF text.
cachedStyles = new Vector();
Point sel = text.getSelectionRange();
int startX = sel.x;
for (int i = sel.x; i <= sel.x + sel.y - 1; i++) {
StyleRange style = text.getStyleRangeAtOffset(i);
if (style != null) {
style.start = style.start - startX;
if (!cachedStyles.isEmpty()) {
StyleRange lastStyle = (StyleRange) cachedStyles
.lastElement();
if (lastStyle.similarTo(style)
&& lastStyle.start + lastStyle.length == style.start) {
lastStyle.length++;
} else {
cachedStyles.addElement(style);
}
} else {
cachedStyles.addElement(style);
}
}
}
}
void handleExtendedModify(ExtendedModifyEvent event) {
if (event.length == 0)
return;
StyleRange style;
if (event.length == 1
|| text.getTextRange(event.start, event.length).equals(
text.getLineDelimiter())) {
// Have the new text take on the style of the text to its right
// (during
// typing) if no style information is active.
int caretOffset = text.getCaretOffset();
style = null;
if (caretOffset < text.getCharCount())
style = text.getStyleRangeAtOffset(caretOffset);
if (style != null) {
style = (StyleRange) style.clone();
style.start = event.start;
style.length = event.length;
} else {
style = new StyleRange(event.start, event.length, null, null,
SWT.NORMAL);
}
if (boldButton.getSelection())
style.fontStyle |= SWT.BOLD;
if (italicButton.getSelection())
style.fontStyle |= SWT.ITALIC;
style.underline = underlineButton.getSelection();
style.strikeout = strikeoutButton.getSelection();
if (!style.isUnstyled())
text.setStyleRange(style);
} else {
// paste occurring, have text take on the styles it had when it was
// cut/copied
for (int i = 0; i < cachedStyles.size(); i++) {
style = (StyleRange) cachedStyles.elementAt(i);
StyleRange newStyle = (StyleRange) style.clone();
newStyle.start = style.start + event.start;
text.setStyleRange(newStyle);
}
}
}
public static void main(String[] args) {
Display display = new Display();
TextEditor example = new TextEditor();
Shell shell = example.open(display);
while (!shell.isDisposed())
if (!display.readAndDispatch())
display.sleep();
display.dispose();
}
public Shell open(Display display) {
createShell(display);
createMenuBar();
createToolBar();
createStyledText();
shell.setSize(500, 300);
shell.open();
return shell;
}
void setFont() {
FontDialog fontDialog = new FontDialog(shell);
fontDialog.setFontList((text.getFont()).getFontData());
FontData fontData = fontDialog.open();
if (fontData != null) {
if (font != null) {
font.dispose();
}
font = new Font(shell.getDisplay(), fontData);
text.setFont(font);
}
}
void initializeColors() {
Display display = Display.getDefault();
RED = new Color(display, new RGB(255, 0, 0));
BLUE = new Color(display, new RGB(0, 0, 255));
GREEN = new Color(display, new RGB(0, 255, 0));
}
}
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