tabletree.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	palette = new PaletteData(new RGB[]{foreground.getRGB(), background.getRGB(), plusMinus.getRGB()});
	imageData = new ImageData(itemHeight, itemHeight, 4, palette);
	imageData.transparentPixel = 1;
	minusImage = new Image(getDisplay(), imageData);
	gc = new GC(minusImage);
	gc.setBackground(background);
	gc.fillRectangle(0, 0, itemHeight, itemHeight);
	gc.setForeground(plusMinus);
	gc.drawRectangle(indent, indent, size, size);
	gc.setForeground(foreground);
	gc.drawLine(indent + 2, midpoint, indent + size - 2, midpoint);
	gc.dispose();
}

Image getPlusImage() {
	if (plusImage == null) createImages();
	return plusImage;
}

Image getMinusImage() {
	if (minusImage == null) createImages();
	return minusImage;
}

/**
 * Gets the index of an item.
 * 
 * <p>The widget is searched starting at 0 until an
 * item is found that is equal to the search item.
 * If no item is found, -1 is returned.  Indexing
 * is zero based.  This index is relative to the parent only.
 *
 * @param item the search item
 * @return the index of the item or -1
 */
public int indexOf (TableTreeItem item) {
	//checkWidget();
	for (int i = 0; i < items.length; i++) {
		if (item == items[i]) return i;
	}
	return -1;
}

void onDispose(Event e) {
	/*
	 * Usually when an item is disposed, destroyItem will change the size of the items array
	 * and dispose of the underlying table items.
	 * Since the whole table tree is being disposed, this is not necessary.  For speed
	 * the inDispose flag is used to skip over this part of the item dispose.
	 */
	inDispose = true;
	for (int i = 0; i < items.length; i++) {
		items[i].dispose();
	}
	inDispose = false;
	if (plusImage != null) plusImage.dispose();
	if (minusImage != null) minusImage.dispose();
	if (sizeImage != null) sizeImage.dispose();
	plusImage = minusImage = sizeImage = null;
}

void onResize(Event e) {
	Point size = getSize();
	table.setBounds(0, 0, size.x, size.y);
}

void onSelection(Event e) {
	Event event = new Event();
	TableItem tableItem = (TableItem)e.item;
	TableTreeItem item = getItem(tableItem);
    event.item = item;

	if (e.type == SWT.Selection && e.detail == SWT.CHECK && item != null) {
		event.detail = SWT.CHECK;
		item.checked = tableItem.getChecked();
	}
	notifyListeners(e.type, event);
}
/**
 * Returns the item at the given point in the receiver
 * or null if no such item exists. The point is in the
 * coordinate system of the receiver.
 *
 * @param point the point used to locate the item
 * @return the item at the given point
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the point 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 TableTreeItem getItem(Point point) {
	checkWidget();
	TableItem item = table.getItem(point);
	if (item == null) return null;
	return getItem(item);
	
}
TableTreeItem getItem(TableItem tableItem) {
	if (tableItem == null) return null;
	for (int i = 0; i < items.length; i++) {
	    	TableTreeItem item = items[i].getItem(tableItem);
	    	if (item != null) return item;
	}
	return null;
}
void onFocusIn (Event e) {
	table.setFocus();
}

void onKeyDown (Event e) {
	TableTreeItem[] selection = getSelection();
	if (selection.length == 0) return;
	TableTreeItem item = selection[0];
	int type = 0;
	if (e.keyCode == SWT.ARROW_RIGHT || e.keyCode == SWT.ARROW_LEFT) {
		int trailKey = (getStyle() & SWT.MIRRORED) != 0 ? SWT.ARROW_LEFT : SWT.ARROW_RIGHT;
		if (e.keyCode == trailKey) {
			if (item.getItemCount() == 0) return;
			if (item.getExpanded()) {
				TableTreeItem newSelection = item.getItems()[0];
				table.setSelection(new TableItem[]{newSelection.tableItem});
				showItem(newSelection);
				type = SWT.Selection;
			} else {
				item.setExpanded(true);
				type = SWT.Expand;
			}
		} else {
			if (item.getExpanded()) {
				item.setExpanded(false);
				type = SWT.Collapse;
			} else {
				TableTreeItem parent = item.getParentItem();
				if (parent != null) {
					int index = parent.indexOf(item);
					if (index != 0) return;
					table.setSelection(new TableItem[]{parent.tableItem});
					type = SWT.Selection;
				}
			}
		}
	}
	if (e.character == '*') {
		item.expandAll(true);
	}
	if (e.character == '-') {
		if (item.getExpanded()) {
			item.setExpanded(false);
			type = SWT.Collapse;
		}
	}
	if (e.character == '+') {
		if (item.getItemCount() > 0 && !item.getExpanded()) {
			item.setExpanded(true);
			type = SWT.Expand;
		}
	} 
	if (type == 0) return;
	Event event = new Event();
	event.item = item;
	notifyListeners(type, event);
}
void onMouseDown(Event event) {
	/* If user clicked on the [+] or [-], expand or collapse the tree. */
	TableItem[] items = table.getItems();
	for (int i = 0; i < items.length; i++) {
		Rectangle rect = items[i].getImageBounds(0);
		if (rect.contains(event.x, event.y)) {
			TableTreeItem item = (TableTreeItem) items[i].getData(ITEMID);
			event = new Event();
			event.item = item;
			item.setExpanded(!item.getExpanded());
			if (item.getExpanded()) {
				notifyListeners(SWT.Expand, event);
			} else {
				notifyListeners(SWT.Collapse, event);
			}
			return;
		}
	}
}

/**
 * Removes all items.
 * <p>
 * This operation will fail when an item
 * could not be removed in the OS.
 *
 * @exception SWTError <ul>
 *	<li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread
 * 	<li>ERROR_WIDGET_DISPOSED when the widget has been disposed
 * 	<li>ERROR_ITEM_NOT_REMOVED when the operation fails
 * </ul>
 */
public void removeAll () {
	checkWidget();
	setRedraw(false);
	for (int i = items.length - 1; i >= 0; i--) {
		items[i].dispose();
	}
	items = EMPTY_ITEMS;
	setRedraw(true);
}

void removeItem(TableTreeItem item) {
	int index = 0;
	while (index < items.length && items[index] != item) index++;
	if (index == items.length) return;
	TableTreeItem[] newItems = new TableTreeItem[items.length - 1];
	System.arraycopy(items, 0, newItems, 0, index);
	System.arraycopy(items, index + 1, newItems, index, items.length - index - 1);
	items = newItems;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the receiver's selection changes.
 *
 * @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) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	removeListener(SWT.Selection, listener);
	removeListener(SWT.DefaultSelection, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when items in the receiver are expanded or collapsed..
 *
 * @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 TreeListener
 * @see #addTreeListener
 */
public void removeTreeListener (TreeListener listener) {
	checkWidget();
	if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	removeListener(SWT.Expand, listener);
	removeListener(SWT.Collapse, listener);
}

/**
 * Selects all of the items in the receiver.
 * <p>
 * If the receiver is single-select, do nothing.
 *
 * @exception SWTError <ul>
 *	<li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread
 *	<li>ERROR_WIDGET_DISPOSED when the widget has been disposed
 * </ul>
 */
public void selectAll () {
	checkWidget();
	table.selectAll();
}
public void setBackground (Color color) {
	super.setBackground(color);
	table.setBackground(color);
	if (sizeImage != null) {
		GC gc = new GC (sizeImage);
		gc.setBackground(getBackground());
		Rectangle size = sizeImage.getBounds();
		gc.fillRectangle(size);
		gc.dispose();
	}
}
public void setEnabled (boolean enabled) {
	super.setEnabled(enabled);
	table.setEnabled(enabled);
}
public void setFont (Font font) {
	super.setFont(font);
	table.setFont(font);
}
public void setForeground (Color color) {
	super.setForeground(color);
	table.setForeground(color);
}
public void setMenu (Menu menu) {
	super.setMenu(menu);
	table.setMenu(menu);
}

/**
 * Sets the receiver's selection to be the given array of items.
 * The current selection is cleared before the new items are selected.
 * <p>
 * Items that are not in the receiver are ignored.
 * If the receiver is single-select and multiple items are specified,
 * then all items are ignored.
 *
 * @param items the array of items
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the array of items is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if one of the item has been disposed</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 TableTree#deselectAll()
 */
public void setSelection (TableTreeItem[] items) {
	checkWidget ();
	if (items == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	int length = items.length;
	if (length == 0 || ((table.getStyle() & SWT.SINGLE) != 0 && length > 1)) {
		deselectAll();
		return;
	}
	TableItem[] tableItems = new TableItem[length];
	for (int i = 0; i < length; i++) {
		if (items[i] == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
		if (!items[i].getVisible()) expandItem (items[i]);
		tableItems[i] = items[i].tableItem;
	}
	table.setSelection(tableItems);
}
public void setToolTipText (String string) {
	super.setToolTipText(string);
	table.setToolTipText(string);
}

/**
 * Shows the item.  If the item is already showing in the receiver,
 * this method simply returns.  Otherwise, the items are scrolled
 * and expanded until the item is visible.
 *
 * @param item the item to be shown
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</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 TableTree#showSelection()
 */
public void showItem (TableTreeItem item) {
	checkWidget();
	if (item == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	if (!item.getVisible()) expandItem (item);
	TableItem tableItem = item.tableItem;
	table.showItem(tableItem);
}

/**
 * Shows the selection.
 * <p>
 * If there is no selection or the selection
 * is already visible, this method does nothing.
 * If the selection is scrolled out of view,
 * the top index of the widget is changed such
 * that selection becomes visible.
 *
 * @exception SWTError <ul>
 *	<li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread
 *	<li>ERROR_WIDGET_DISPOSED when the widget has been disposed
 * </ul>
 */
public void showSelection () {
	checkWidget();
	table.showSelection();
}
}