ccombo.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

*
* This operation will fail when the index is out
* of range or an item could not be removed from
* the OS.
*
* @param index the index of the item
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_ITEM_NOT_REMOVED)
*	when the operation fails
*/
public void remove (int index) {
	checkWidget();
	list.remove (index);
}
/**
* Removes a range of items.
* <p>
* Indexing is zero based.  The range of items
* is from the start index up to and including
* the end index.
*
* This operation will fail when the index is out
* of range or an item could not be removed from
* the OS.
*
* @param start the start of the range
* @param end the end of the range
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_ITEM_NOT_REMOVED)
*	when the operation fails
*/
public void remove (int start, int end) {
	checkWidget();
	list.remove (start, end);
}
/**
* Removes an item.
* <p>
* This operation will fail when the item
* could not be removed from the OS.
*
* @param string the search item
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_NULL_ARGUMENT)
*	when string is null
* @exception SWTError(ERROR_ITEM_NOT_REMOVED)
*	when the operation fails
*/
public void remove (String string) {
	checkWidget();
	if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	list.remove (string);
}
/**
* Removes all items.
* <p>
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
*/
public void removeAll () {
	checkWidget();
	text.setText (""); //$NON-NLS-1$
	list.removeAll ();
}
/**	 
* Removes the listener.
* <p>
*
* @param listener the listener
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_NULL_ARGUMENT)
*	when listener is null
*/
public void removeModifyListener (ModifyListener listener) {
	checkWidget();
	if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	removeListener(SWT.Modify, listener);	
}
/**	 
* Removes the listener.
* <p>
*
* @param listener the listener
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_NULL_ARGUMENT)
*	when listener is null
*/
public void removeSelectionListener (SelectionListener listener) {
	checkWidget();
	if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	removeListener(SWT.Selection, listener);
	removeListener(SWT.DefaultSelection,listener);	
}
/**
* Selects an item.
* <p>
* If the item at an index is not selected, it is
* selected. Indices that are out of
* range are ignored.  Indexing is zero based.
*
* @param index the index of the item
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
*/
public void select (int index) {
	checkWidget();
	if (index == -1) {
		list.deselectAll ();
		text.setText (""); //$NON-NLS-1$
		return;
	}
	if (0 <= index && index < list.getItemCount()) {
		if (index != getSelectionIndex()) {
			text.setText (list.getItem (index));
			text.selectAll ();
			list.select (index);
			list.showSelection ();
		}
	}
}
public void setBackground (Color color) {
	super.setBackground(color);
	background = color;
	if (text != null) text.setBackground(color);
	if (list != null) list.setBackground(color);
	if (arrow != null) arrow.setBackground(color);
}
/**
 * Sets the editable state.
 *
 * @param editable the new editable state
 *
 * @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>
 *
 * @since 3.0
 *
 */
public void setEditable (boolean editable) {
	checkWidget ();
	text.setEditable(editable);
}
public void setEnabled (boolean enabled) {
	super.setEnabled(enabled);
	if (popup != null) popup.setVisible (false);
	if (text != null) text.setEnabled(enabled);
	if (arrow != null) arrow.setEnabled(enabled);
}
public boolean setFocus () {
	checkWidget();
	return text.setFocus ();
}
public void setFont (Font font) {
	super.setFont (font);
	this.font = font;
	text.setFont (font);
	list.setFont (font);
	internalLayout ();
}
public void setForeground (Color color) {
	super.setForeground(color);
	foreground = color;
	if (text != null) text.setForeground(color);
	if (list != null) list.setForeground(color);
	if (arrow != null) arrow.setForeground(color);
}
/**
* Sets the text of an item; indexing is zero based.
*
* This operation will fail when the index is out
* of range or an item could not be changed in
* the OS.
*
* @param index the index for the item
* @param string the item
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_NULL_ARGUMENT)
*	when items is null
* @exception SWTError(ERROR_ITEM_NOT_MODIFIED)
*	when the operation fails
*/
public void setItem (int index, String string) {
	checkWidget();
	if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	list.setItem (index, string);
}
/**
* Sets all items.
*
* @param items the array of items
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_NULL_ARGUMENT)
*	when items is null
* @exception SWTError(ERROR_ITEM_NOT_ADDED)
*	when the operation fails
*/
public void setItems (String [] items) {
	checkWidget();
	if (items == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	if (!text.getEditable()) text.setText (""); //$NON-NLS-1$
	list.setItems (items);
}
/**
* Sets the new selection.
*
* @param selection point representing the start and the end of the new selection
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_NULL_ARGUMENT)
*	when selection is null
*/
public void setSelection (Point selection) {
	checkWidget();
	if (selection == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	text.setSelection (selection.x, selection.y);
}

/**
* Sets the widget text.
*
* @param string the widget text
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_NULL_ARGUMENT)
*	when string is null
*/
public void setText (String string) {
	checkWidget();
	if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	int index = list.indexOf (string);
	if (index == -1) {
		list.deselectAll ();
		text.setText (string);
		return;
	}
	text.setText (string);
	text.selectAll ();
	list.setSelection (index);
	list.showSelection ();
}
/**
* Sets the text limit.
* 
* @param limit new text limit
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
* @exception SWTError(ERROR_CANNOT_BE_ZERO)
*	when limit is 0
*/
public void setTextLimit (int limit) {
	checkWidget();
	text.setTextLimit (limit);
}

public void setToolTipText (String string) {
	checkWidget();
	super.setToolTipText(string);
	arrow.setToolTipText (string);
	text.setToolTipText (string);		
}

public void setVisible (boolean visible) {
	super.setVisible(visible);
	if (!visible) popup.setVisible(false);
}
/**
 * Sets the number of items that are visible in the drop
 * down portion of the receiver's list.
 *
 * @param count the new number of items to be visible
 *
 * @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>
 * 
 * @since 3.0
 */
public void setVisibleItemCount (int count) {
	checkWidget ();
	if (count < 0) return;
	visibleItemCount = count;
}
String stripMnemonic (String string) {
	int index = 0;
	int length = string.length ();
	do {
		while ((index < length) && (string.charAt (index) != '&')) index++;
		if (++index >= length) return string;
		if (string.charAt (index) != '&') {
			return string.substring(0, index-1) + string.substring(index, length);
		}
		index++;
	} while (index < length);
 	return string;
}
void textEvent (Event event) {
	switch (event.type) {
		case SWT.FocusIn: {
			handleFocus (SWT.FocusIn);
			break;
		}
		case SWT.KeyDown: {
			if (event.character == SWT.CR) {
				dropDown (false);
				Event e = new Event();
				e.time = event.time;
				e.stateMask = event.stateMask;
				notifyListeners(SWT.DefaultSelection, e);
			}
			//At this point the widget may have been disposed.
			// If so, do not continue.
			if (isDisposed()) break;
			
			if (event.keyCode == SWT.ARROW_UP || event.keyCode == SWT.ARROW_DOWN) {
				if ((event.stateMask & SWT.ALT) != 0) {
					boolean dropped = isDropped ();
					text.selectAll ();
					if (!dropped) setFocus ();
					dropDown (!dropped);
					break;
				}

				int oldIndex = getSelectionIndex ();
				if (event.keyCode == SWT.ARROW_UP) {
					select (Math.max (oldIndex - 1, 0));
				} else {
					select (Math.min (oldIndex + 1, getItemCount () - 1));
				}
		
				if (oldIndex != getSelectionIndex ()) {
					Event e = new Event();
					e.time = event.time;
					e.stateMask = event.stateMask;
					notifyListeners(SWT.Selection, e);
				}
				//At this point the widget may have been disposed.
				// If so, do not continue.
				if (isDisposed()) break;
			}
			
			// Further work : Need to add support for incremental search in 
			// pop up list as characters typed in text widget
						
			Event e = new Event();
			e.time = event.time;
			e.character = event.character;
			e.keyCode = event.keyCode;
			e.stateMask = event.stateMask;
			notifyListeners(SWT.KeyDown, e);
			break;
		}
		case SWT.KeyUp: {
			Event e = new Event();
			e.time = event.time;
			e.character = event.character;
			e.keyCode = event.keyCode;
			e.stateMask = event.stateMask;
			notifyListeners(SWT.KeyUp, e);
			break;
		}
		case SWT.Modify: {
			list.deselectAll ();
			Event e = new Event();
			e.time = event.time;
			notifyListeners(SWT.Modify, e);
			break;
		}
		case SWT.MouseDown: {
			if (event.button != 1) return;
			if (text.getEditable ()) return;
			boolean dropped = isDropped ();
			text.selectAll ();
			if (!dropped) setFocus ();
			dropDown (!dropped);
			break;
		}
		case SWT.MouseUp: {
			if (event.button != 1) return;
			if (text.getEditable ()) return;
			text.selectAll ();
			break;
		}
		case SWT.Traverse: {		
			switch (event.detail) {
				case SWT.TRAVERSE_RETURN:
				case SWT.TRAVERSE_ARROW_PREVIOUS:
				case SWT.TRAVERSE_ARROW_NEXT:
					// The enter causes default selection and
					// the arrow keys are used to manipulate the list contents so
					// do not use them for traversal.
					event.doit = false;
					break;
			}
			
			Event e = new Event();
			e.time = event.time;
			e.detail = event.detail;
			e.doit = event.doit;
			e.character = event.character;
			e.keyCode = event.keyCode;
			notifyListeners(SWT.Traverse, e);
			event.doit = e.doit;
			event.detail = e.detail;
			break;
		}
	}
}
}