/*******************************************************************************
* Copyright (c) 2003, 2011 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.wst.server.ui.internal.editor;
import org.eclipse.jface.action.Action;
import org.eclipse.wst.server.ui.internal.Trace;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Text;
/**
* Text actions (cut, copy, paste) for the Web browser.
*/
public class TextAction extends Action {
protected Display display;
protected Clipboard clipboard;
protected byte type;
public static final byte CUT_ACTION = 0;
public static final byte COPY_ACTION = 1;
public static final byte PASTE_ACTION = 2;
/**
* TextAction constructor comment.
*/
protected TextAction(Display display, byte type) {
super("Text action: " + type);
this.display = display;
clipboard = new Clipboard(display);
this.type = type;
}
protected Control getControl() {
Control control = display.getFocusControl();
return control;
}
protected Point getControlSelection() {
Control control = getControl();
if (control == null)
return null;
if (control instanceof Text) {
Text text = (Text) control;
return text.getSelection();
} else if (control instanceof Combo) {
Combo combo = (Combo) control;
return combo.getSelection();
} else
return null;
}
protected void setControlSelection(Point sel) {
Control control = getControl();
if (control == null)
return;
if (control instanceof Text) {
Text text = (Text) control;
text.setSelection(sel);
} else if (control instanceof Combo) {
Combo combo = (Combo) control;
combo.setSelection(sel);
}
}
protected String getControlText() {
Control control = getControl();
if (control == null)
return null;
if (control instanceof Text) {
Text text = (Text) control;
return text.getText();
} else if (control instanceof Combo) {
Combo combo = (Combo) control;
return combo.getText();
} else
return null;
}
protected void setControlText(String text) {
Control control = getControl();
if (control == null)
return;
if (control instanceof Text) {
Text text2 = (Text) control;
text2.setText(text);
} else if (control instanceof Combo) {
Combo combo = (Combo) control;
combo.setText(text);
}
}
/**
* Copies the selected text to the clipboard. The text will be put in the
* clipboard in plain text format.
*/
public void copy() {
Point selection = getControlSelection();
String text = getControlText();
if (selection == null || text == null)
return;
int length = selection.y - selection.x;
if (length > 0) {
TextTransfer plainTextTransfer = TextTransfer.getInstance();
try {
clipboard.setContents(
new String[] { text.substring(selection.x, selection.y) },
new Transfer[] { plainTextTransfer });
} catch (SWTError error) {
// Copy to clipboard failed. This happens when another application
// is accessing the clipboard while we copy. Ignore the error.
}
}
}
/**
* Moves the selected text to the clipboard. The text will be put in the
* clipboard in plain text format and RTF format.
*/
public void cut(){
Point selection = getControlSelection();
if (selection == null)
return;
if (selection.y > selection.x) {
copy();
delete();
}
}
/**
* Deletes the character to the right of the caret. Delete the selected text if any.
*/
public void delete() {
Point selection = getControlSelection();
String text = getControlText();
if (selection == null || text == null)
return;
if (selection.x != selection.y) {
text = text.substring(0, selection.x) + text.substring(selection.y);
setControlText(text);
setControlSelection(new Point(selection.x, selection.x));
}
}
/**
* Replaces the selection with the clipboard text or insert the text at
* the current caret offset if there is no selection.
* If the widget has the SWT.SINGLE style and the clipboard text contains
* more than one line, only the first line without line delimiters is
* inserted in the widget.
*/
public void paste() {
TextTransfer transfer = TextTransfer.getInstance();
Point selection = getControlSelection();
String text = getControlText();
if (selection == null)
return;
String newText = (String) clipboard.getContents(transfer);
if (newText != null && newText.length() > 0) {
if (text == null)
text = newText;
else
text = text.substring(0, selection.x) + newText + text.substring(selection.y);
setControlText(text);
// set the selection to the end of the paste
int x = selection.x + newText.length();
setControlSelection(new Point(x, x));
}
}
/**
* Execute the action.
*/
public void run() {
if (display == null)
return;
if (type == CUT_ACTION)
cut();
else if (type == COPY_ACTION)
copy();
else if (type == PASTE_ACTION)
paste();
}
/**
* Update the actions enabled/disabled state.
*/
protected void update() {
if (getControl() == null) {
setEnabled(false);
return;
}
Point selection = getControlSelection();
String text = getControlText();
try {
if (type == CUT_ACTION)
setEnabled(text != null && text.length() > 0 && selection != null && selection.x < selection.y);
else if (type == COPY_ACTION)
setEnabled(text != null && text.length() > 0 && selection != null && selection.x < selection.y);
else if (type == PASTE_ACTION) {
Control control = getControl();
if (!control.isEnabled()) {
setEnabled(false);
return;
}
if (!(control instanceof Text)) {
setEnabled(false);
return;
}
Text text2 = (Text) control;
if (!text2.getEditable()) {
setEnabled(false);
return;
}
TextTransfer transfer = TextTransfer.getInstance();
String newText = (String) clipboard.getContents(transfer);
setEnabled(newText != null && newText.length() > 0);
}
} catch (Exception e) {
if (Trace.SEVERE) {
Trace.trace(Trace.STRING_SEVERE, "Error updating text action", e);
}
}
}
}