/*******************************************************************************
* Copyright (c) 2000, 2005 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.custom;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
/**
* A TableTree is a selectable user interface object
* that displays a hierarchy of items, and issues
* notification when an item is selected.
* A TableTree may be single or multi select.
* <p>
* The item children that may be added to instances of this class
* must be of type <code>TableTreeItem</code>.
* </p><p>
* Note that although this class is a subclass of <code>Composite</code>,
* it does not make sense to add <code>Control</code> children to it,
* or set a layout on it.
* </p><p>
* <dl>
* <dt><b>Styles:</b> <dd> SINGLE, MULTI, CHECK, FULL_SELECTION
* <dt><b>Events:</b> <dd> Selection, DefaultSelection, Collapse, Expand
* </dl>
* <p>
* Note: Only one of the styles SINGLE, and MULTI may be specified.
* </p>
*
* @deprecated As of 3.1 use Tree, TreeItem and TreeColumn
*/
public class TableTree extends Composite {
Table table;
TableTreeItem[] items = EMPTY_ITEMS;
Image plusImage, minusImage, sizeImage;
/*
* TableTreeItems are not treated as children but rather as items.
* When the TableTree is disposed, all children are disposed because
* TableTree inherits this behaviour from Composite. The items
* must be disposed separately. Because TableTree is not part of
* the org.eclipse.swt.widgets package, the method releaseWidget can
* not be overriden (this is how items are disposed of in Table and Tree).
* Instead, the items are disposed of in response to the dispose event on the
* TableTree. The "inDispose" flag is used to distinguish between disposing
* one TableTreeItem (e.g. when removing an entry from the TableTree) and
* disposing the entire TableTree.
*/
boolean inDispose = false;
static final TableTreeItem[] EMPTY_ITEMS = new TableTreeItem [0];
static final String[] EMPTY_TEXTS = new String [0];
static final Image[] EMPTY_IMAGES = new Image [0];
static final String ITEMID = "TableTreeItemID"; //$NON-NLS-1$
/**
* 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 widget which will be the parent of the new instance (cannot be null)
* @param style the style of widget 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>
* </ul>
*
* @see SWT#SINGLE
* @see SWT#MULTI
* @see SWT#CHECK
* @see SWT#FULL_SELECTION
* @see #getStyle
*/
public TableTree(Composite parent, int style) {
super(parent, checkStyle (style));
table = new Table(this, style);
Listener tableListener = new Listener() {
public void handleEvent(Event e) {
switch (e.type) {
case SWT.MouseDown: onMouseDown(e); break;
case SWT.Selection: onSelection(e); break;
case SWT.DefaultSelection: onSelection(e); break;
case SWT.KeyDown: onKeyDown(e); break;
}
}
};
int[] tableEvents = new int[]{SWT.MouseDown,
SWT.Selection,
SWT.DefaultSelection,
SWT.KeyDown};
for (int i = 0; i < tableEvents.length; i++) {
table.addListener(tableEvents[i], tableListener);
}
Listener listener = new Listener() {
public void handleEvent(Event e) {
switch (e.type) {
case SWT.Dispose: onDispose(e); break;
case SWT.Resize: onResize(e); break;
case SWT.FocusIn: onFocusIn(e); break;
}
}
};
int[] events = new int[]{SWT.Dispose,
SWT.Resize,
SWT.FocusIn};
for (int i = 0; i < events.length; i++) {
addListener(events[i], listener);
}
}
int addItem(TableTreeItem item, int index) {
if (index < 0 || index > items.length) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
TableTreeItem[] newItems = new TableTreeItem[items.length + 1];
System.arraycopy(items, 0, newItems, 0, index);
newItems[index] = item;
System.arraycopy(items, index, newItems, index + 1, items.length - index);
items = newItems;
/* Return the index in the table where this table should be inserted */
if (index == items.length - 1 )
return table.getItemCount();
else
return table.indexOf(items[index+1].tableItem);
}
/**
* Adds the listener to the collection of listeners who will
* be notified when the receiver's selection changes, by sending
* it one of the messages defined in the <code>SelectionListener</code>
* interface.
* <p>
* When <code>widgetSelected</code> is called, the item field of the event object is valid.
* If the reciever has <code>SWT.CHECK</code> style set and the check selection changes,
* the event object detail field contains the value <code>SWT.CHECK</code>.
* <code>widgetDefaultSelected</code> is typically called when an item is double-clicked.
* The item field of the event object is valid for default selection, but the detail field is not used.
* </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) SWT.error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Selection,typedListener);
addListener (SWT.DefaultSelection,typedListener);
}
/**
* Adds the listener to the collection of listeners who will
* be notified when an item in the receiver is expanded or collapsed
* by sending it one of the messages defined in the <code>TreeListener</code>
* interface.
*
* @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 TreeListener
* @see #removeTreeListener
*/
public void addTreeListener(TreeListener listener) {
checkWidget();
if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Expand, typedListener);
addListener (SWT.Collapse, typedListener);
}
private static int checkStyle (int style) {
int mask = SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
style = style & mask;
return style;
}
public Point computeSize (int wHint, int hHint, boolean changed) {
checkWidget();
return table.computeSize (wHint, hHint, changed);
}
public Rectangle computeTrim (int x, int y, int width, int height) {
checkWidget();
return table.computeTrim(x, y, width, height);
}
/**
* Deselects all items.
* <p>
* If an item is selected, it is deselected.
* If an item is not selected, it remains unselected.
*
* @exception SWTException <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 deselectAll () {
checkWidget();
table.deselectAll();
}
/* Expand upward from the specified leaf item. */
void expandItem (TableTreeItem item) {
if (item == null) return;
expandItem(item.parentItem);
if (!item.getVisible()) item.setVisible(true);
if ( !item.expanded && item.items.length > 0) {
item.setExpanded(true);
Event event = new Event();
event.item = item;
notifyListeners(SWT.Expand, event);
}
}
public Color getBackground () {
// This method must be overriden otherwise, in a TableTree in which the first
// item has no sub items, a grey (Widget background colour) square will appear in
// the first column of the first item.
// It is not possible in the constructor to set the background of the TableTree
// to be the same as the background of the Table because this interferes with
// the TableTree adapting to changes in the System color settings.
return table.getBackground();
}
public Rectangle getClientArea () {
return table.getClientArea();
}
public Color getForeground () {
return table.getForeground();
}
public Font getFont () {
return table.getFont();
}
/**
* Gets the number of items.
* <p>
* @return the number of items in the widget
*/
public int getItemCount () {
//checkWidget();
return items.length;
}
/**
* Gets the height of one item.
* <p>
* This operation will fail if the height of
* one item could not be queried from the OS.
*
* @return the height of one item in the widget
*
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread
* <li>ERROR_WIDGET_DISPOSED when the widget has been disposed
* </ul>
*/
public int getItemHeight () {
checkWidget();
return table.getItemHeight();
}
/**
* Gets the items.
* <p>
* @return the items in the widget
*/
public TableTreeItem [] getItems () {
//checkWidget();
TableTreeItem[] newItems = new TableTreeItem[items.length];
System.arraycopy(items, 0, newItems, 0, items.length);
return newItems;
}
/**
* Gets the selected items.
* <p>
* This operation will fail if the selected
* items cannot be queried from the OS.
*
* @return the selected items in the widget
*
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li>
* <li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li>
* </ul>
*/
public TableTreeItem [] getSelection () {
checkWidget();
TableItem[] selection = table.getSelection();
TableTreeItem [] result = new TableTreeItem[selection.length];
for (int i = 0; i < selection.length; i++){
result[i] = (TableTreeItem) selection[i].getData(ITEMID);
}
return result;
}
/**
* Gets the number of selected items.
* <p>
* This operation will fail if the number of selected
* items cannot be queried from the OS.
*
* @return the number of selected items in the widget
*
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li>
* <li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li>
* </ul>
*/
public int getSelectionCount () {
checkWidget();
return table.getSelectionCount();
}
public int getStyle () {
checkWidget();
return table.getStyle();
}
/**
* Returns the underlying Table control.
*
* @return the underlying Table control
*/
public Table getTable () {
//checkWidget();
return table;
}
void createImages () {
int itemHeight = sizeImage.getBounds().height;
// Calculate border around image.
// At least 9 pixels are needed to draw the image
// Leave at least a 6 pixel border.
int indent = Math.min(6, (itemHeight - 9) / 2);
indent = Math.max(0, indent);
int size = Math.max (10, itemHeight - 2 * indent);
size = ((size + 1) / 2) * 2; // size must be an even number
int midpoint = indent + size / 2;
Color foreground = getForeground();
Color plusMinus = getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
Color background = getBackground();
/* Plus image */
PaletteData palette = new PaletteData(new RGB[]{foreground.getRGB(), background.getRGB(), plusMinus.getRGB()});
ImageData imageData = new ImageData(itemHeight, itemHeight, 4, palette);
imageData.transparentPixel = 1;
plusImage = new Image(getDisplay(), imageData);
GC gc = new GC(plusImage);
gc.setBackground(background);
gc.fillRectangle(0, 0, itemHeight, itemHeight);
gc.setForeground(plusMinus);
gc.drawRectangle(indent, indent, size, size);
gc.setForeground(foreground);
gc.drawLine(midpoint, indent + 2, midpoint, indent + size - 2);
gc.drawLine(indent + 2, midpoint, indent + size - 2, midpoint);
gc.dispose();
/* Minus image */
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, zero-relative index in the
* receiver. Throws an exception if the index is out of range.
*
* @param index the index of the item to return
* @return the item at the given index
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</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>
*
* @since 3.1
*/
public TableTreeItem getItem (int index) {
checkWidget();
int count = items.length;
if (!(0 <= index && index < count)) SWT.error (SWT.ERROR_INVALID_RANGE);
return items [index];
}
/**
* 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 SWTException <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 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 SWTException <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 SWTException <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();
}
protected boolean useNativeScrollBar() {
return true;
}
}
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