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/*******************************************************************************
* Copyright (c) 2000, 2015 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
* Brad Reynolds - bug 141435
* Tom Schindl <tom.schindl@bestsolution.at> - bug 157309, 177619
*******************************************************************************/
package org.eclipse.jface.viewers;
import java.util.List;
import org.eclipse.core.runtime.Assert;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
/**
* A concrete viewer based on an SWT <code>List</code> control.
* <p>
* This class is not intended to be subclassed. It is designed to be
* instantiated with a pre-existing SWT <code>List</code> control and configured
* with a domain-specific content provider, label provider, element filter (optional),
* and element sorter (optional).
* <p>
* Note that the SWT <code>List</code> control only supports the display of strings, not icons.
* If you need to show icons for items, use <code>TableViewer</code> instead.
* </p>
*
* @see TableViewer
* @noextend This class is not intended to be subclassed by clients.
*/
public class ListViewer extends AbstractListViewer {
/**
* This viewer's list control.
*/
private org.eclipse.swt.widgets.List list;
/**
* Creates a list viewer on a newly-created list control under the given parent.
* The list control is created using the SWT style bits <code>MULTI, H_SCROLL, V_SCROLL,</code> and <code>BORDER</code>.
* The viewer has no input, no content provider, a default label provider,
* no sorter, and no filters.
*
* @param parent the parent control
*/
public ListViewer(Composite parent) {
this(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
}
/**
* Creates a list viewer on a newly-created list control under the given parent.
* The list control is created using the given SWT style bits.
* The viewer has no input, no content provider, a default label provider,
* no sorter, and no filters.
*
* @param parent the parent control
* @param style the SWT style bits
*/
public ListViewer(Composite parent, int style) {
this(new org.eclipse.swt.widgets.List(parent, style));
}
/**
* Creates a list viewer on the given list control.
* The viewer has no input, no content provider, a default label provider,
* no sorter, and no filters.
*
* @param list the list control
*/
public ListViewer(org.eclipse.swt.widgets.List list) {
this.list = list;
hookControl(list);
}
@Override
public Control getControl() {
return list;
}
/**
* Returns this list viewer's list control.
*
* @return the list control
*/
public org.eclipse.swt.widgets.List getList() {
return list;
}
@Override
public void reveal(Object element) {
Assert.isNotNull(element);
int index = getElementIndex(element);
if (index == -1) {
return;
}
// algorithm patterned after List.showSelection()
int count = list.getItemCount();
if (count == 0) {
return;
}
int height = list.getItemHeight();
Rectangle rect = list.getClientArea();
int topIndex = list.getTopIndex();
int visibleCount = Math.max(rect.height / height, 1);
int bottomIndex = Math.min(topIndex + visibleCount, count) - 1;
if ((topIndex <= index) && (index <= bottomIndex)) {
return;
}
int newTop = Math.min(Math.max(index - (visibleCount / 2), 0),
count - 1);
list.setTopIndex(newTop);
}
@Override
protected void listAdd(String string, int index) {
list.add(string, index);
}
@Override
protected void listSetItem(int index, String string) {
list.setItem(index, string);
}
@Override
protected int[] listGetSelectionIndices() {
return list.getSelectionIndices();
}
@Override
protected int listGetItemCount() {
return list.getItemCount();
}
@Override
protected void listSetItems(String[] labels) {
list.setItems(labels);
}
@Override
protected void listRemoveAll() {
list.removeAll();
}
@Override
protected void listRemove(int index) {
list.remove(index);
}
@Override
protected void listSetSelection(int[] ixs) {
list.setSelection(ixs);
}
@Override
protected void listDeselectAll() {
list.deselectAll();
}
@Override
protected void listShowSelection() {
list.showSelection();
}
@Override
protected int listGetTopIndex() {
return list.getTopIndex();
}
@Override
protected void listSetTopIndex(int index) {
list.setTopIndex(index);
}
@Override
protected void setSelectionToWidget(List in, boolean reveal) {
if( reveal ) {
super.setSelectionToWidget(in, reveal);
} else {
if (in == null || in.isEmpty()) { // clear selection
list.deselectAll();
} else {
int n = in.size();
int[] ixs = new int[n];
int count = 0;
for (int i = 0; i < n; ++i) {
Object el = in.get(i);
int ix = getElementIndex(el);
if (ix >= 0) {
ixs[count++] = ix;
}
}
if (count < n) {
System.arraycopy(ixs, 0, ixs = new int[count], 0, count);
}
list.deselectAll();
list.select(ixs);
}
}
}
}
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