net.sourceforge.phpeclipse.webbrowser/src/org/eclipse/webbrowser/internal/TextAction.java

   1 /**
   2  * Copyright (c) 2003 IBM Corporation and others.
   3  * All rights reserved.   This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *    IBM - Initial API and implementation
  10  */
  11 package org.eclipse.webbrowser.internal;
  12
  13 import org.eclipse.swt.SWTError;
  14 import org.eclipse.swt.graphics.Point;
  15 import org.eclipse.swt.dnd.*;
  16 import org.eclipse.webbrowser.internal.WebBrowser;
  17 import org.eclipse.jface.action.Action;
  18 /**
  19  * Text actions (cut, copy, paste) for the Web browser.
  20  */
  21 public class TextAction extends Action {
  22         protected WebBrowser browser;
  23         protected byte type;
  24
  25         public static final byte CUT = 0;
  26         public static final byte COPY = 1;
  27         public static final byte PASTE = 2;
  28
  29         /**
  30          * TextAction constructor comment.
  31          */
  32         protected TextAction(WebBrowser browser, byte type) {
  33                 super(type + "!");
  34                 this.browser = browser;
  35                 this.type = type;
  36         }
  37
  38         /**
  39          * Copies the selected text to the clipboard.  The text will be put in the
  40          * clipboard in plain text format.
  41          * <p>
  42          *
  43          * @exception SWTException <ul>
  44          *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  45          *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  46          * </ul>
  47          */
  48         public void copy() {
  49                 Point selection = browser.combo.getSelection();
  50
  51                 int length = selection.y - selection.x;
  52                 if (length > 0) {
  53                         TextTransfer plainTextTransfer = TextTransfer.getInstance();
  54                         try {
  55                                 browser.clipboard.setContents(
  56                                         new String[] { browser.combo.getText().substring(selection.x, selection.y) },
  57                                         new Transfer[] { plainTextTransfer });
  58                         } catch (SWTError error) {
  59                                 // Copy to clipboard failed. This happens when another application
  60                                 // is accessing the clipboard while we copy. Ignore the error.
  61                                 // Fixes 1GDQAVN
  62                         }
  63                 }
  64         }
  65
  66         /**
  67          * Moves the selected text to the clipboard.  The text will be put in the
  68          * clipboard in plain text format and RTF format.
  69          * <p>
  70          *
  71          * @exception SWTException <ul>
  72          *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  73          *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  74          * </ul>
  75          */
  76         public void cut(){
  77                 Point selection = browser.combo.getSelection();
  78
  79                 if (selection.y > selection.x) {
  80                         copy();
  81                         delete();
  82                 }
  83         }
  84
  85         /**
  86          * Deletes the character to the right of the caret. Delete the selected text if any.
  87          */
  88         public void delete() {
  89                 Point selection = browser.combo.getSelection();
  90                 String text = browser.combo.getText();
  91
  92                 if (selection.x != selection.y) {
  93                         text = text.substring(0, selection.x) + text.substring(selection.y);
  94                         browser.combo.setText(text);
  95                         browser.combo.setSelection(new Point(selection.x, selection.x));
  96                 }
  97         }
  98
  99         /**
 100          * Replaces the selection with the clipboard text or insert the text at
 101          * the current caret offset if there is no selection.
 102          * If the widget has the SWT.SINGLE style and the clipboard text contains
 103          * more than one line, only the first line without line delimiters is
 104          * inserted in the widget.
 105          * <p>
 106          *
 107          * @exception SWTException <ul>
 108          *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 109          *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 110          * </ul>
 111          */
 112         public void paste() {
 113                 TextTransfer transfer = TextTransfer.getInstance();
 114                 Point selection = browser.combo.getSelection();
 115                 String text = browser.combo.getText();
 116
 117                 String newText = (String) browser.clipboard.getContents(transfer);
 118                 if (newText != null && newText.length() > 0) {
 119                         text = text.substring(0, selection.x) + newText + text.substring(selection.y);
 120                         browser.combo.setText(text);
 121
 122                         // set the selection to the end of the paste
 123                         int x = selection.x + newText.length();
 124                         browser.combo.setSelection(new Point(x, x));
 125                 }
 126         }
 127
 128         /**
 129          * Implementation of method defined on <code>IAction</code>.
 130          */
 131         public void run() {
 132                 if (browser == null || browser.combo == null)
 133                         return;
 134                 if (type == CUT)
 135                         cut();
 136                 else if (type == COPY)
 137                         copy();
 138                 else if (type == PASTE)
 139                         paste();
 140         }
 141
 142         /**
 143          *
 144          */
 145         protected void update() {       }
 146 }