/*******************************************************************************
* Copyright (c) 2000, 2009 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.widgets;
import org.eclipse.swt.internal.wpf.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
/**
* Instances of this class represent a selectable
* user interface object that displays a text with
* links.
* <p>
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>(none)</dd>
* <dt><b>Events:</b></dt>
* <dd>Selection</dd>
* </dl>
* <p>
* IMPORTANT: This class is <em>not</em> intended to be subclassed.
* </p>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#link">Link snippets</a>
* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.1
* @noextend This class is not intended to be subclassed by clients.
*/
public class Link extends Control {
Point [] offsets;
Point selection;
String [] ids;
String text;
private int[] mnemonics;
/**
* Constructs a new instance of this class given its parent
* and a style value describing its behavior and appearance.
* <p>
* The style value is either one of the style constants defined in
* class <code>SWT</code> which is applicable to instances of this
* class, or must be built by <em>bitwise OR</em>'ing together
* (that is, using the <code>int</code> "|" operator) two or more
* of those <code>SWT</code> style constants. The class description
* lists the style constants that are applicable to the class.
* Style bits are also inherited from superclasses.
* </p>
*
* @param parent a composite control which will be the parent of the new instance (cannot be null)
* @param style the style of control to construct
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
* </ul>
*
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Link (Composite parent, int style) {
super (parent, style);
}
/**
* Adds the listener to the collection of listeners who will
* be notified when the control is selected by the user, by sending
* it one of the messages defined in the <code>SelectionListener</code>
* interface.
* <p>
* <code>widgetSelected</code> is called when the control is selected by the user.
* <code>widgetDefaultSelected</code> is not called.
* </p>
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @see SelectionListener
* @see #removeSelectionListener
* @see SelectionEvent
*/
public void addSelectionListener (SelectionListener listener) {
checkWidget ();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Selection, typedListener);
addListener (SWT.DefaultSelection, typedListener);
}
int backgroundProperty () {
return OS.TextBlock_BackgroundProperty ();
}
void createHandle () {
state |= THEME_BACKGROUND;
handle = OS.gcnew_TextBlock ();
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
}
int defaultBackground () {
return OS.SystemColors_ControlColor;
}
String getNameText () {
return getText ();
}
/**
* Returns the receiver's text, which will be an empty
* string if it has never been set.
*
* @return the receiver's text
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public String getText () {
checkWidget ();
return text;
}
void HandleClick (int sender, int e) {
if (!checkEvent (e)) return;
int source = OS.RoutedEventArgs_Source (e);
int i = OS.FrameworkContentElement_Tag (source);
OS.GCHandle_Free (source);
Event event = new Event ();
event.text = ids [i];
sendEvent (SWT.Selection, event);
}
String parse (String string) {
int length = string.length ();
offsets = new Point [length / 4];
ids = new String [length / 4];
mnemonics = new int [length / 4 + 1];
StringBuffer result = new StringBuffer ();
char [] buffer = new char [length];
string.getChars (0, string.length (), buffer, 0);
int index = 0, state = 0, linkIndex = 0;
int start = 0, tagStart = 0, linkStart = 0, endtagStart = 0, refStart = 0;
while (index < length) {
char c = Character.toLowerCase (buffer [index]);
switch (state) {
case 0:
if (c == '<') {
tagStart = index;
state++;
}
break;
case 1:
if (c == 'a') state++;
break;
case 2:
switch (c) {
case 'h':
state = 7;
break;
case '>':
linkStart = index + 1;
state++;
break;
default:
if (Character.isWhitespace(c)) break;
else state = 13;
}
break;
case 3:
if (c == '<') {
endtagStart = index;
state++;
}
break;
case 4:
state = c == '/' ? state + 1 : 3;
break;
case 5:
state = c == 'a' ? state + 1 : 3;
break;
case 6:
if (c == '>') {
mnemonics [linkIndex] = parseMnemonics (buffer, start, tagStart, result);
int offset = result.length ();
parseMnemonics (buffer, linkStart, endtagStart, result);
offsets [linkIndex] = new Point (offset, result.length () - 1);
if (ids [linkIndex] == null) {
ids [linkIndex] = new String (buffer, linkStart, endtagStart - linkStart);
}
linkIndex++;
start = tagStart = linkStart = endtagStart = refStart = index + 1;
state = 0;
} else {
state = 3;
}
break;
case 7:
state = c == 'r' ? state + 1 : 0;
break;
case 8:
state = c == 'e' ? state + 1 : 0;
break;
case 9:
state = c == 'f' ? state + 1 : 0;
break;
case 10:
state = c == '=' ? state + 1 : 0;
break;
case 11:
if (c == '"') {
state++;
refStart = index + 1;
} else {
state = 0;
}
break;
case 12:
if (c == '"') {
ids[linkIndex] = new String (buffer, refStart, index - refStart);
state = 2;
}
break;
case 13:
if (Character.isWhitespace (c)) {
state = 0;
} else if (c == '='){
state++;
}
break;
case 14:
state = c == '"' ? state + 1 : 0;
break;
case 15:
if (c == '"') state = 2;
break;
default:
state = 0;
break;
}
index++;
}
if (start < length) {
int tmp = parseMnemonics (buffer, start, tagStart, result);
int mnemonic = parseMnemonics (buffer, Math.max (tagStart, linkStart), length, result);
if (mnemonic == -1) mnemonic = tmp;
mnemonics [linkIndex] = mnemonic;
} else {
mnemonics [linkIndex] = -1;
}
if (offsets.length != linkIndex) {
Point [] newOffsets = new Point [linkIndex];
System.arraycopy (offsets, 0, newOffsets, 0, linkIndex);
offsets = newOffsets;
String [] newIDs = new String [linkIndex];
System.arraycopy (ids, 0, newIDs, 0, linkIndex);
ids = newIDs;
int [] newMnemonics = new int [linkIndex + 1];
System.arraycopy (mnemonics, 0, newMnemonics, 0, linkIndex + 1);
mnemonics = newMnemonics;
}
return result.toString ();
}
int parseMnemonics (char [] buffer, int start, int end, StringBuffer result) {
int mnemonic = -1, index = start;
while (index < end) {
if (buffer [index] == '&') {
if (index + 1 < end && buffer [index + 1] == '&') {
result.append (buffer [index]);
index++;
} else {
mnemonic = result.length();
}
} else {
result.append (buffer [index]);
}
index++;
}
return mnemonic;
}
/**
* Removes the listener from the collection of listeners who will
* be notified when the control is selected by the user.
*
* @param listener the listener which should no longer be notified
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @see SelectionListener
* @see #addSelectionListener
*/
public void removeSelectionListener (SelectionListener listener) {
checkWidget ();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (SWT.Selection, listener);
eventTable.unhook (SWT.DefaultSelection, listener);
}
void setFont (int font, double size) {
if (font != 0) {
int fontFamily = OS.Typeface_FontFamily( font);
int style = OS.Typeface_Style (font);
int weight = OS.Typeface_Weight (font);
int stretch = OS.Typeface_Stretch (font);
OS.TextBlock_FontFamily (handle, fontFamily);
OS.TextBlock_FontStyle (handle, style);
OS.TextBlock_FontWeight (handle, weight);
OS.TextBlock_FontStretch (handle, stretch);
OS.TextBlock_FontSize (handle, size);
OS.GCHandle_Free (fontFamily);
OS.GCHandle_Free (style);
OS.GCHandle_Free (weight);
OS.GCHandle_Free (stretch);
} else {
int property = OS.TextBlock_FontFamilyProperty ();
OS.DependencyObject_ClearValue (handle, property);
OS.GCHandle_Free (property);
property = OS.TextBlock_FontStyleProperty ();
OS.DependencyObject_ClearValue (handle, property);
OS.GCHandle_Free (property);
property = OS.TextBlock_FontWeightProperty ();
OS.DependencyObject_ClearValue (handle, property);
OS.GCHandle_Free (property);
property = OS.TextBlock_FontStretchProperty ();
OS.DependencyObject_ClearValue (handle, property);
OS.GCHandle_Free (property);
property = OS.TextBlock_FontSizeProperty ();
OS.DependencyObject_ClearValue (handle, property);
OS.GCHandle_Free (property);
}
}
void setForegroundBrush (int brush) {
//TODO
}
/**
* Sets the receiver's text.
* <p>
* The string can contain both regular text and hyperlinks. A hyperlink
* is delimited by an anchor tag, <A> and </A>. Within an
* anchor, a single HREF attribute is supported. When a hyperlink is
* selected, the text field of the selection event contains either the
* text of the hyperlink or the value of its HREF, if one was specified.
* In the rare case of identical hyperlinks within the same string, the
* HREF attribute can be used to distinguish between them. The string may
* include the mnemonic character and line delimiters. The only delimiter
* the HREF attribute supports is the quotation mark (").
* </p>
* <p>
* Mnemonics are indicated by an '&' that causes the next
* character to be the mnemonic. The receiver can have a
* mnemonic in the text preceding each link. When the user presses a
* key sequence that matches the mnemonic, focus is assigned
* to the link that follows the text. Mnemonics in links and in
* the trailing text are ignored. On most platforms,
* the mnemonic appears underlined but may be emphasised in a
* platform specific manner. The mnemonic indicator character
* '&' can be escaped by doubling it in the string, causing
* a single '&' to be displayed.
* </p>
*
* @param string the new text
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the text is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public void setText (String string) {
checkWidget ();
if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
if (string.equals (text)) return;
text = string;
String parsed = parse (string);
int inlines = OS.TextBlock_Inlines (handle);
OS.InlineCollection_Clear (inlines);
int start = 0, end = parsed.length ();
int offsetIndex = 0;
while (start < end) {
Point point = offsetIndex < offsets.length ? offsets [offsetIndex] : null;
if (point == null) {
String substring = parsed.substring (start, end);
int stringPtr = createDotNetString (substring, false);
if (stringPtr == 0) error(SWT.ERROR_NO_HANDLES);
int run = OS.gcnew_Run ();
if (run == 0) error(SWT.ERROR_NO_HANDLES);
OS.Run_Text (run, stringPtr);
OS.InlineCollection_Add (inlines, run);
OS.GCHandle_Free (stringPtr);
OS.GCHandle_Free (run);
start = end;
} else {
if (start < point.x) {
String substring = parsed.substring (start, point.x);
int stringPtr = createDotNetString (substring, false);
if (stringPtr == 0) error(SWT.ERROR_NO_HANDLES);
int run = OS.gcnew_Run ();
if (run == 0) error(SWT.ERROR_NO_HANDLES);
OS.Run_Text (run, stringPtr);
OS.InlineCollection_Add (inlines, run);
OS.GCHandle_Free (stringPtr);
OS.GCHandle_Free (run);
start = point.x;
} else {
String substring = parsed.substring (point.x, point.y+1);
int stringPtr = createDotNetString (substring, false);
if (stringPtr == 0) error(SWT.ERROR_NO_HANDLES);
int run = OS.gcnew_Run ();
if (run == 0) error(SWT.ERROR_NO_HANDLES);
OS.Run_Text (run, stringPtr);
int hyperlink = OS.gcnew_Hyperlink (run);
OS.FrameworkContentElement_Tag (hyperlink, offsetIndex);
OS.InlineCollection_Add (inlines, hyperlink);
int handler = OS.gcnew_RoutedEventHandler (jniRef, "HandleClick");
OS.Hyperlink_Click (hyperlink, handler);
OS.GCHandle_Free (handler);
OS.GCHandle_Free (stringPtr);
OS.GCHandle_Free (run);
OS.GCHandle_Free (hyperlink);
start = point.y+1;
offsetIndex++;
}
}
}
OS.GCHandle_Free (inlines);
}
int traversalCode (int key, int event) {
// if (offsets.length == 0) return 0;
int bits = super.traversalCode (key, event);
// if (key == OS.Key_Tab && focusIndex < offsets.length - 1) {
// return bits & ~SWT.TRAVERSE_TAB_NEXT;
// }
// if (key == OS.GDK_ISO_Left_Tab && focusIndex > 0) {
// return bits & ~SWT.TRAVERSE_TAB_PREVIOUS;
// }
//TODO
return bits;
}
}