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CTreeCombo.java
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CTreeCombo.java
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/*******************************************************************************
* Copyright (c) 2019 Thomas Schindl & Laurent Caron.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* - Thomas Schindl (tom dot schindl at bestsolution dot at) - initial API
* and implementation
* - Laurent Caron (laurent dot caron at gmail dot com) - Integration to Nebula,
* code cleaning and documentation
*******************************************************************************/
package org.eclipse.nebula.widgets.ctreecombo;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.accessibility.AccessibleTextAdapter;
import org.eclipse.swt.accessibility.AccessibleTextEvent;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.events.TreeEvent;
import org.eclipse.swt.events.TreeListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeColumn;
import org.eclipse.swt.widgets.TreeItem;
import org.eclipse.swt.widgets.TypedListener;
import org.eclipse.swt.widgets.Widget;
public class CTreeCombo extends Composite {
static int checkStyle(int style) {
final int mask = SWT.BORDER | SWT.READ_ONLY | SWT.FLAT | SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
return SWT.NO_FOCUS | style & mask;
}
Text text;
Tree tree;
Button arrow;
Listener listener, filter;
Shell popup;
boolean hasFocus;
int visibleItemCount = 5;
Color foreground, background;
Font font;
List<CTreeComboItem> items = new ArrayList<CTreeComboItem>();
List<CTreeComboColumn> columns = new ArrayList<CTreeComboColumn>();
List<TreeListener> treeListeners = new ArrayList<TreeListener>();
private final TreeListener hookListener = new TreeListener() {
@Override
public void treeCollapsed(TreeEvent e) {
e.item = (Widget) e.item.getData(CTreeComboItem.DATA_ID);
e.widget = CTreeCombo.this;
for (final TreeListener l : treeListeners) {
l.treeCollapsed(e);
}
}
@Override
public void treeExpanded(TreeEvent e) {
e.item = (Widget) e.item.getData(CTreeComboItem.DATA_ID);
e.widget = CTreeCombo.this;
for (final TreeListener l : treeListeners) {
l.treeExpanded(e);
}
}
};
/**
* The CTreeCombo class represents a selectable user interface object
* that combines a text field and a tree and issues notification
* when an item is selected from the tree.
* <p>
* Note that although this class is a subclass of <code>Composite</code>,
* it does not make sense to add children to it, or set a layout on it.
* </p>
* <dl>
* <dt><b>Styles:</b>
* <dd>BORDER, READ_ONLY, FLAT</dd>
* <dt><b>Events:</b>
* <dd>DefaultSelection, Modify, Selection, Verify</dd>
* </dl>
*/
public CTreeCombo(Composite parent, int style) {
super(parent, style = checkStyle(style));
int textStyle = SWT.SINGLE;
if ((style & SWT.READ_ONLY) != 0) {
textStyle |= SWT.READ_ONLY;
}
if ((style & SWT.FLAT) != 0) {
textStyle |= SWT.FLAT;
}
text = new Text(this, textStyle);
int arrowStyle = SWT.ARROW | SWT.DOWN;
if ((style & SWT.FLAT) != 0) {
arrowStyle |= SWT.FLAT;
}
arrow = new Button(this, arrowStyle);
listener = new Listener() {
@Override
public void handleEvent(Event event) {
if (popup == event.widget) {
popupEvent(event);
return;
}
if (text == event.widget) {
textEvent(event);
return;
}
if (tree == event.widget) {
treeEvent(event);
return;
}
if (arrow == event.widget) {
arrowEvent(event);
return;
}
if (CTreeCombo.this == event.widget) {
comboEvent(event);
return;
}
if (getShell() == event.widget) {
getDisplay().asyncExec(new Runnable() {
@Override
public void run() {
if (isDisposed()) {
return;
}
handleFocus(SWT.FocusOut);
}
});
}
}
};
filter = (event) -> {
final Shell shell = ((Control) event.widget).getShell();
if (shell == CTreeCombo.this.getShell()) {
handleFocus(SWT.FocusOut);
}
};
final int[] comboEvents = { SWT.Dispose, SWT.FocusIn, SWT.Move, SWT.Resize };
for (int i = 0; i < comboEvents.length; i++) {
addListener(comboEvents[i], listener);
}
final int[] textEvents = { SWT.DefaultSelection, SWT.KeyDown, SWT.KeyUp, SWT.MenuDetect, SWT.Modify, SWT.MouseDown, SWT.MouseUp, SWT.MouseDoubleClick, SWT.MouseWheel, SWT.Traverse, SWT.FocusIn, SWT.Verify };
for (int i = 0; i < textEvents.length; i++) {
text.addListener(textEvents[i], listener);
}
final int[] arrowEvents = { SWT.MouseDown, SWT.MouseUp, SWT.Selection, SWT.FocusIn };
for (int i = 0; i < arrowEvents.length; i++) {
arrow.addListener(arrowEvents[i], listener);
}
createPopup(null, null);
initAccessible();
}
char _findMnemonic(String string) {
if (string == null) {
return '\0';
}
int index = 0;
final int length = string.length();
do {
while (index < length && string.charAt(index) != '&') {
index++;
}
if (++index >= length) {
return '\0';
}
if (string.charAt(index) != '&') {
return Character.toLowerCase(string.charAt(index));
}
index++;
} while (index < length);
return '\0';
}
/**
* Adds the listener to the collection of listeners who will be notified when
* the user changes the receiver's selection, by sending it one of the messages
* defined in the <code>SelectionListener</code> interface.
* <p>
* <code>widgetSelected</code> is called when the combo's list selection
* changes. <code>widgetDefaultSelected</code> is typically called when ENTER is
* pressed the combo's text area.
* </p>
*
* @param listener
* the listener which should be notified when the user changes the
* receiver's selection
*
* @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(final SelectionListener listener) {
checkWidget();
if (listener == null) {
SWT.error(SWT.ERROR_NULL_ARGUMENT);
}
final 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();
treeListeners.add(listener);
}
private void adjustShellSize() {
final Point size = getSize();
final int itemCount = visibleItemCount;
final int itemHeight = tree.getItemHeight() * itemCount;
final Point listSize = tree.computeSize(SWT.DEFAULT, itemHeight, false);
tree.setBounds(1, 1, Math.max(size.x - 2, listSize.x), listSize.y);
final Display display = getDisplay();
final Rectangle listRect = tree.getBounds();
final Rectangle parentRect = display.map(getParent(), null, getBounds());
final Point comboSize = getSize();
final Rectangle displayRect = getMonitor().getClientArea();
final int width = Math.max(comboSize.x, listRect.width + 2);
final int height = listRect.height + 2;
int x = parentRect.x;
int y = parentRect.y + comboSize.y;
if (y + height > displayRect.y + displayRect.height) {
y = parentRect.y - height;
}
if (x + width > displayRect.x + displayRect.width) {
x = displayRect.x + displayRect.width - listRect.width;
}
popup.setBounds(x, y, width, height);
}
void arrowEvent(Event event) {
switch (event.type) {
case SWT.FocusIn: {
handleFocus(SWT.FocusIn);
break;
}
case SWT.MouseDown: {
final Event mouseEvent = new Event();
mouseEvent.button = event.button;
mouseEvent.count = event.count;
mouseEvent.stateMask = event.stateMask;
mouseEvent.time = event.time;
mouseEvent.x = event.x;
mouseEvent.y = event.y;
notifyListeners(SWT.MouseDown, mouseEvent);
event.doit = mouseEvent.doit;
break;
}
case SWT.MouseUp: {
final Event mouseEvent = new Event();
mouseEvent.button = event.button;
mouseEvent.count = event.count;
mouseEvent.stateMask = event.stateMask;
mouseEvent.time = event.time;
mouseEvent.x = event.x;
mouseEvent.y = event.y;
notifyListeners(SWT.MouseUp, mouseEvent);
event.doit = mouseEvent.doit;
break;
}
case SWT.Selection: {
text.setFocus();
dropDown(!isDropped());
break;
}
}
}
/**
* Clears the item at the given zero-relative index in the receiver.
* The text, icon and other attributes of the item are set to the default
* value. If the tree was created with the <code>SWT.VIRTUAL</code> style,
* these attributes are requested again as needed.
*
* @param index the index of the item to clear
* @param all <code>true</code> if all child items of the indexed item should be
* cleared recursively, and <code>false</code> otherwise
*
* @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>
*
* @see SWT#VIRTUAL
* @see SWT#SetData
*/
public void clear(int index, boolean all) {
checkWidget();
tree.clear(index, all);
}
/**
* Clears all the items in the receiver. The text, icon and other
* attributes of the items are set to their default values. If the
* tree was created with the <code>SWT.VIRTUAL</code> style, these
* attributes are requested again as needed.
*
* @param all <code>true</code> if all child items should be cleared
* recursively, and <code>false</code> otherwise
*
* @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 SWT#VIRTUAL
* @see SWT#SetData
*/
public void clearAll(boolean all) {
checkWidget();
tree.clearAll(all);
text.setFont(text.getFont());
text.setText(""); //$NON-NLS-1$
}
void comboEvent(Event event) {
switch (event.type) {
case SWT.Dispose:
if (popup != null && !popup.isDisposed()) {
tree.removeListener(SWT.Dispose, listener);
popup.dispose();
}
final Shell shell = getShell();
shell.removeListener(SWT.Deactivate, listener);
final Display display = getDisplay();
display.removeFilter(SWT.FocusIn, filter);
popup = null;
text = null;
tree = null;
arrow = null;
break;
case SWT.FocusIn:
final Control focusControl = getDisplay().getFocusControl();
if (focusControl == arrow || focusControl == tree) {
return;
}
if (isDropped()) {
tree.setFocus();
} else {
text.setFocus();
}
break;
case SWT.Move:
dropDown(false);
break;
case SWT.Resize:
internalLayout(false);
break;
}
}
/**
* @see org.eclipse.swt.widgets.Control#computeSize(int, int, boolean)
*/
@Override
public Point computeSize(int wHint, int hHint, boolean changed) {
checkWidget();
int width = 0, height = 0;
final TreeItem[] items = tree.getItems();
final GC gc = new GC(text);
final int spacer = gc.stringExtent(" ").x; //$NON-NLS-1$
int textWidth = gc.stringExtent(text.getText()).x;
for (int i = 0; i < items.length; i++) {
textWidth = Math.max(gc.stringExtent(items[i].getText()).x, textWidth);
}
gc.dispose();
final Point textSize = text.computeSize(SWT.DEFAULT, SWT.DEFAULT, changed);
final Point arrowSize = arrow.computeSize(SWT.DEFAULT, SWT.DEFAULT, changed);
final Point listSize = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT, changed);
final int borderWidth = getBorderWidth();
height = Math.max(textSize.y, arrowSize.y + 5);
width = Math.max(textWidth + 2 * spacer + arrowSize.x + 2 * borderWidth, listSize.x);
if (wHint != SWT.DEFAULT) {
width = wHint;
}
if (hHint != SWT.DEFAULT) {
height = hHint;
}
return new Point(width + 2 * borderWidth, height + 2 * borderWidth);
}
void createPopup(Collection<CTreeComboItem> items, CTreeComboItem selectedItem) {
// create shell and list
popup = new Shell(getShell(), SWT.NO_TRIM | SWT.ON_TOP);
final int style = getStyle();
int listStyle = SWT.H_SCROLL | SWT.V_SCROLL | SWT.SINGLE;
if ((style & SWT.FLAT) != 0) {
listStyle |= SWT.FLAT;
}
if ((style & SWT.RIGHT_TO_LEFT) != 0) {
listStyle |= SWT.RIGHT_TO_LEFT;
}
if ((style & SWT.LEFT_TO_RIGHT) != 0) {
listStyle |= SWT.LEFT_TO_RIGHT;
}
tree = new Tree(popup, listStyle);
tree.addTreeListener(hookListener);
if (font != null) {
tree.setFont(font);
}
if (foreground != null) {
tree.setForeground(foreground);
}
if (background != null) {
tree.setBackground(background);
}
final int[] popupEvents = { SWT.Close, SWT.Paint, SWT.Deactivate };
for (int i = 0; i < popupEvents.length; i++) {
popup.addListener(popupEvents[i], listener);
}
final int[] listEvents = { SWT.MouseUp, SWT.Selection, SWT.Traverse, SWT.KeyDown, SWT.KeyUp, SWT.FocusIn, SWT.Dispose, SWT.Collapse, SWT.Expand };
for (int i = 0; i < listEvents.length; i++) {
tree.addListener(listEvents[i], listener);
}
for (final CTreeComboColumn c : columns) {
final TreeColumn col = new TreeColumn(tree, SWT.NONE);
c.setRealTreeColumn(col);
}
if (items != null) {
createTreeItems(items.toArray(new CTreeComboItem[0]));
}
if (selectedItem != null) {
tree.setSelection(selectedItem.getRealTreeItem());
}
}
private void createTreeItems(CTreeComboItem[] items) {
boolean isReadOnly = (getStyle() & SWT.READ_ONLY) != 0;
for (final CTreeComboItem item : items) {
if (!isReadOnly && !match(item) && item.getItemCount() == 0) {
continue;
}
item.buildRealTreeItem(tree, columns.size());
createTreeItems(item.getItems());
if (!isReadOnly && !match(item) && item.getRealTreeItem().getItemCount() == 0) {
item.getRealTreeItem().dispose();
}
}
}
private boolean match(final CTreeComboItem item) {
final String entry = text.getText().trim().toLowerCase();
if (entry.equals("") || item.getText().trim().equals("")) {
return true;
}
return item.getText().trim().toLowerCase().indexOf(entry) > -1;
}
/**
* Deselects all selected items in the receiver.
*
* @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 deselectAll() {
checkWidget();
tree.deselectAll();
}
void dropDown(boolean drop) {
if (drop == isDropped() || !isVisible()) {
return;
}
if (!drop) {
popup.setVisible(false);
if (!isDisposed() && isFocusControl()) {
text.setFocus();
}
return;
}
CTreeComboItem selectionIndex = null;
if (getShell() != popup.getParent()) {
final TreeItem[] s = tree.getSelection();
if (s.length > 0) {
selectionIndex = (CTreeComboItem) s[0].getData(CTreeComboItem.DATA_ID);
}
}
// Rebuild the popup and filter data if the widget is not read-only (based on what is typed)
tree.removeListener(SWT.Dispose, listener);
popup.dispose();
popup = null;
tree = null;
createPopup(items, selectionIndex);
final TreeItem[] items = tree.getSelection();
if (items.length != 0) {
tree.showItem(items[0]);
}
adjustShellSize();
popup.setVisible(true);
popup.setActive();
if (isFocusControl()) {
tree.setFocus();
}
}
Label getAssociatedLabel() {
final Control[] siblings = getParent().getChildren();
for (int i = 0; i < siblings.length; i++) {
if (siblings[i] == this) {
if (i > 0 && siblings[i - 1] instanceof Label) {
return (Label) siblings[i - 1];
}
}
}
return null;
}
/**
* Returns the column at the given, zero-relative index in the
* receiver. Throws an exception if the index is out of range.
* Columns are returned in the order that they were created.
* If no <code>TreeColumn</code>s were created by the programmer,
* this method will throw <code>ERROR_INVALID_RANGE</code> despite
* the fact that a single column of data may be visible in the tree.
* This occurs when the programmer uses the tree like a list, adding
* items but never creating a column.
*
* @param index the index of the column to return
* @return the column 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>
*
*/
public CTreeComboColumn getColumn(int columnIndex) {
checkWidget();
return columns.get(columnIndex);
}
/**
* Returns the number of columns contained in the receiver.
* If no <code>TreeColumn</code>s were created by the programmer,
* this value is zero, despite the fact that visually, one column
* of items may be visible. This occurs when the programmer uses
* the tree like a list, adding items but never creating a column.
*
* @return the number of columns
*
* @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 int getColumnCount() {
checkWidget();
return tree.getColumnCount();
}
/**
* Returns an array of zero-relative integers that map
* the creation order of the receiver's items to the
* order in which they are currently being displayed.
* <p>
* Specifically, the indices of the returned array represent
* the current visual order of the items, and the contents
* of the array represent the creation order of the items.
* </p>
* <p>
* Note: This is not the actual structure used by the receiver
* to maintain its list of items, so modifying the array will
* not affect the receiver.
* </p>
*
* @return the current visual order of the receiver's items
*
* @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 int[] getColumnOrder() {
checkWidget();
return tree.getColumnOrder();
}
/**
* Gets the editable state.
*
* @return whether or not the receiver is editable
*
* @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 boolean getEditable() {
checkWidget();
return text.getEditable();
}
/**
* 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>
*/
public CTreeComboItem getItem(int index) {
checkWidget();
return items.get(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.
* <p>
* The item that is returned represents an item that could be selected by the user.
* For example, if selection only occurs in items in the first column, then null is
* returned if the point is outside of the item.
* Note that the SWT.FULL_SELECTION style hint, which specifies the selection policy,
* determines the extent of the selection.
* </p>
*
* @param point the point used to locate the item
* @return the item at the given point, or null if the point is not in a selectable item
*
* @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 CTreeComboItem getItem(Point p) {
checkWidget();
final TreeItem item = tree.getItem(p);
if (item != null) {
item.getData(CTreeComboItem.DATA_ID);
}
return null;
}
/**
* Returns the number of items contained in the receiver
* that are direct item children of the receiver. The
* number that is returned is the number of roots in the
* tree.
*
* @return the number of items
*
* @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 int getItemCount() {
checkWidget();
return tree.getItemCount();
}
/**
* Returns a (possibly empty) array of items contained in the
* receiver that are direct item children of the receiver. These
* are the roots of the tree.
* <p>
* Note: This is not the actual structure used by the receiver
* to maintain its list of items, so modifying the array will
* not affect the receiver.
* </p>
*
* @return the items
*
* @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 CTreeComboItem[] getItems() {
checkWidget();
return items.toArray(new CTreeComboItem[0]);
}
/**
* Returns an array of <code>CTreeComboItem</code>s that are currently
* selected in the receiver. The order of the items is unspecified.
* An empty array indicates that no items are selected.<br/>
* <strong>This array could not have more than 1 element (because it is a single selection)</strong>
* <p>
* Note: This is not the actual structure used by the receiver
* to maintain its selection, so modifying the array will
* not affect the receiver.
* </p>
*
* @return an array representing the selection
*
* @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 CTreeComboItem[] getSelection() {
checkWidget();
final TreeItem[] items = tree.getSelection();
if (items.length > 0) {
return new CTreeComboItem[] { (CTreeComboItem) items[0].getData(CTreeComboItem.DATA_ID) };
}
return new CTreeComboItem[0];
}
/**
* Returns a string containing a copy of the contents of the
* receiver's text field.
*
* @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.getText();
}
void handleFocus(int type) {
if (isDisposed()) {
return;
}
switch (type) {
case SWT.FocusIn: {
if (hasFocus) {
return;
}
if (getEditable()) {
text.selectAll();
}
hasFocus = true;
final Shell shell = getShell();
shell.removeListener(SWT.Deactivate, listener);
shell.addListener(SWT.Deactivate, listener);
final Display display = getDisplay();
display.removeFilter(SWT.FocusIn, filter);
display.addFilter(SWT.FocusIn, filter);
final Event e = new Event();
notifyListeners(SWT.FocusIn, e);
break;
}
case SWT.FocusOut: {
if (!hasFocus) {
return;
}
final Control focusControl = getDisplay().getFocusControl();
if (focusControl == arrow || focusControl == tree || focusControl == text) {
return;
}
hasFocus = false;
final Shell shell = getShell();
shell.removeListener(SWT.Deactivate, listener);
final Display display = getDisplay();
display.removeFilter(SWT.FocusIn, filter);
final Event e = new Event();
notifyListeners(SWT.FocusOut, e);
break;
}
}
}
/**
* Searches the receiver's list starting at the first column
* (index 0) until a column is found that is equal to the
* argument, and returns the index of that column. If no column
* is found, returns -1.
*
* @param column the search column
* @return the index of the column
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the column 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 int indexOf(CTreeComboItem item) {
checkWidget();
return tree.indexOf(item.getRealTreeItem());
}
void initAccessible() {
final AccessibleAdapter accessibleAdapter = new AccessibleAdapter() {
@Override
public void getHelp(AccessibleEvent e) {
e.result = getToolTipText();
}
@Override
public void getKeyboardShortcut(AccessibleEvent e) {
String shortcut = null;
final Label label = getAssociatedLabel();
if (label != null) {
final String text = label.getText();
if (text != null) {
final char mnemonic = _findMnemonic(text);
if (mnemonic != '\0') {
shortcut = "Alt+" + mnemonic; //$NON-NLS-1$
}
}
}
e.result = shortcut;
}
@Override
public void getName(AccessibleEvent e) {
String name = null;
final Label label = getAssociatedLabel();
if (label != null) {
name = stripMnemonic(label.getText());
}
e.result = name;
}
};
getAccessible().addAccessibleListener(accessibleAdapter);
text.getAccessible().addAccessibleListener(accessibleAdapter);
tree.getAccessible().addAccessibleListener(accessibleAdapter);
arrow.getAccessible().addAccessibleListener(new AccessibleAdapter() {
@Override
public void getHelp(AccessibleEvent e) {
e.result = getToolTipText();
}
@Override
public void getKeyboardShortcut(AccessibleEvent e) {
e.result = "Alt+Down Arrow"; //$NON-NLS-1$
}
@Override
public void getName(AccessibleEvent e) {
e.result = isDropped() ? SWT.getMessage("SWT_Close") : SWT.getMessage("SWT_Open"); //$NON-NLS-1$ //$NON-NLS-2$
}
});
getAccessible().addAccessibleTextListener(new AccessibleTextAdapter() {
@Override
public void getCaretOffset(AccessibleTextEvent e) {
e.offset = text.getCaretPosition();
}
@Override
public void getSelectionRange(AccessibleTextEvent e) {
final Point sel = text.getSelection();
e.offset = sel.x;
e.length = sel.y - sel.x;
}
});
getAccessible().addAccessibleControlListener(new AccessibleControlAdapter() {
@Override
public void getChildAtPoint(AccessibleControlEvent e) {
final Point testPoint = toControl(e.x, e.y);
if (getBounds().contains(testPoint)) {
e.childID = ACC.CHILDID_SELF;
}
}
@Override
public void getChildCount(AccessibleControlEvent e) {
e.detail = 0;
}
@Override
public void getLocation(AccessibleControlEvent e) {
final Rectangle location = getBounds();
final Point pt = getParent().toDisplay(location.x, location.y);
e.x = pt.x;
e.y = pt.y;
e.width = location.width;