org.eclipse.jface.layout.TreeColumnLayout Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2007, 2015 IBM Corporation and others.
*
* 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:
* Tom Schindl - initial API and implementation
* - fix for bug 178280, 183999, 184609
* Ruediger Herrmann - fix for bug 395890
* IBM Corporation - API refactoring and general maintenance
*******************************************************************************/
package org.eclipse.jface.layout;
import org.eclipse.jface.viewers.ColumnLayoutData;
import org.eclipse.jface.viewers.ColumnPixelData;
import org.eclipse.swt.events.TreeEvent;
import org.eclipse.swt.events.TreeListener;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.Scrollable;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeColumn;
import org.eclipse.swt.widgets.Widget;
/**
* The TreeColumnLayout is the {@link Layout} used to maintain {@link TreeColumn} sizes in a
* {@link Tree}.
*
*
* You can only add the {@link Layout} to a container whose only
* child is the {@link Tree} control you want the {@link Layout} applied to.
* Don't assign the layout directly the {@link Tree}
*
*
* @since 3.3
*/
public class TreeColumnLayout extends AbstractColumnLayout {
private boolean addListener = true;
private static class TreeLayoutListener implements TreeListener {
@Override
public void treeCollapsed(TreeEvent e) {
update((Tree) e.widget);
}
@Override
public void treeExpanded(TreeEvent e) {
update((Tree) e.widget);
}
private void update(final Tree tree) {
tree.getDisplay().asyncExec(() -> {
if (!tree.isDisposed()) {
tree.update();
tree.getParent().layout();
}
});
}
}
private static final TreeLayoutListener listener = new TreeLayoutListener();
/**
* Creates a new tree column layout.
*/
public TreeColumnLayout() {
}
/**
* Creates a new tree column layout.
*
* @param adjustForScrollBar
* true if the layout should reserve space for the
* vertical scroll bar
* @since 3.12
*/
public TreeColumnLayout(boolean adjustForScrollBar) {
super(adjustForScrollBar);
}
@Override
protected void layout(Composite composite, boolean flushCache) {
super.layout(composite, flushCache);
if( addListener ) {
addListener=false;
((Tree)getControl(composite)).addTreeListener(listener);
}
}
/**
* {@inheritDoc}
*
* @since 3.5
*/
@Override
protected int getColumnCount(Scrollable tree) {
return ((Tree) tree).getColumnCount();
}
/**
* {@inheritDoc}
*
* @since 3.5
*/
@Override
protected void setColumnWidths(Scrollable tree, int[] widths) {
TreeColumn[] columns = ((Tree) tree).getColumns();
for (int i = 0; i < widths.length; i++) {
columns[i].setWidth(widths[i]);
}
}
/**
* {@inheritDoc}
*
* @since 3.5
*/
@Override
protected ColumnLayoutData getLayoutData(Scrollable tableTree, int columnIndex) {
TreeColumn column = ((Tree) tableTree).getColumn(columnIndex);
return (ColumnLayoutData) column.getData(LAYOUT_DATA);
}
/**
* {@inheritDoc}
*
* @since 3.5
*/
@Override
protected void updateColumnData(Widget column) {
TreeColumn tColumn = (TreeColumn) column;
Tree t = tColumn.getParent();
if( ! IS_GTK || t.getColumn(t.getColumnCount()-1) != tColumn ){
tColumn.setData(LAYOUT_DATA,new ColumnPixelData(tColumn.getWidth()));
layout(t.getParent(), true);
}
}
}