/*******************************************************************************
* Copyright (c) 2008 Pierre-Antoine Grégoire.
* 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:
* Pierre-Antoine Grégoire - initial API and implementation
*******************************************************************************/
package org.org.eclipse.core.utils.platform.dialogs.selection;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.ColumnLayoutData;
import org.eclipse.jface.viewers.ColumnPixelData;
import org.eclipse.jface.viewers.ColumnWeightData;
/**
* A special composite to layout columns inside a table. The composite is needed since we have to layout the columns "before" the actual table gets layouted. Hence we can't use a normal layout manager.
*/
public class TableLayoutComposite extends Composite {
private List<ColumnLayoutData> columns = new ArrayList<ColumnLayoutData>();
/**
* Creates a new <code>TableLayoutComposite</code>.
*/
public TableLayoutComposite(Composite parent, int style) {
super(parent, style);
final Composite fParent = parent;
addControlListener(new ControlAdapter() {
public void controlResized(ControlEvent e) {
// Rectangle area = ((TableLayoutComposite)e.widget).getParent().getParent().getBounds();
Table table = (Table) getChildren()[0];
// Point preferredSize = computeTableSize(table);
// int width = area.width - 2 * table.getBorderWidth();
// if (preferredSize.y > area.height) {
// // Subtract the scrollbar width from the total column width
// // if a vertical scrollbar will be required
// Point vBarSize = table.getVerticalBar().getSize();
// width -= vBarSize.x;
// }
layoutTable(table, fParent.getSize().x, fParent.getBounds(), table.getSize().x < fParent.getBounds().width);
}
});
}
/**
* Adds a new column of data to this table layout.
*
* @param data
* the column layout data
*/
public void addColumnData(ColumnLayoutData data) {
columns.add(data);
}
// ---- Helpers -------------------------------------------------------------------------------------
@SuppressWarnings("unused")
private Point computeTableSize(Table table) {
Point result = table.computeSize(SWT.DEFAULT, SWT.DEFAULT);
int width = 0;
for (ColumnLayoutData layoutData : columns) {
if (layoutData instanceof ColumnPixelData) {
ColumnPixelData col = (ColumnPixelData) layoutData;
width += col.width;
} else if (layoutData instanceof ColumnWeightData) {
ColumnWeightData col = (ColumnWeightData) layoutData;
width += col.minimumWidth;
} else {
Assert.isTrue(false, "Unknown column layout data"); //$NON-NLS-1$
}
}
if (width > result.x)
result.x = width;
return result;
}
private void layoutTable(Table table, int width, Rectangle area, boolean increase) {
// XXX: Layout is being called with an invalid value the first time
// it is being called on Linux. This method resets the
// Layout to null so we make sure we run it only when
// the value is OK.
if (width <= 1)
return;
TableColumn[] tableColumns = table.getColumns();
int size = Math.min(columns.size(), tableColumns.length);
int[] widths = new int[size];
int fixedWidth = 0;
int numberOfWeightColumns = 0;
int totalWeight = 0;
int i = 0;
// First calc space occupied by fixed columns
for (ColumnLayoutData layoutData : columns) {
if (layoutData instanceof ColumnPixelData) {
int pixels = ((ColumnPixelData) layoutData).width;
widths[i++] = pixels;
fixedWidth += pixels;
} else if (layoutData instanceof ColumnWeightData) {
ColumnWeightData cw = (ColumnWeightData) layoutData;
numberOfWeightColumns++;
// first time, use the weight specified by the column data, otherwise use the actual width as the weight
// int weight = firstTime ? cw.weight : tableColumns[i].getWidth();
int weight = cw.weight;
totalWeight += weight;
} else {
Assert.isTrue(false, "Unknown column layout data"); //$NON-NLS-1$
}
}
// Do we have columns that have a weight
if (numberOfWeightColumns > 0) {
// Now distribute the rest to the columns with weight.
int rest = width - fixedWidth;
int totalDistributed = 0;
for (ColumnLayoutData layoutData : columns) {
if (layoutData instanceof ColumnWeightData) {
ColumnWeightData cw = (ColumnWeightData) layoutData;
// calculate weight as above
// int weight = firstTime ? cw.weight : tableColumns[i].getWidth();
int weight = cw.weight;
int pixels = totalWeight == 0 ? 0 : weight * rest / totalWeight;
if (pixels < cw.minimumWidth)
pixels = cw.minimumWidth;
totalDistributed += pixels;
widths[i] = pixels;
}
}
// Distribute any remaining pixels to columns with weight.
int diff = rest - totalDistributed;
for (int j = 0; diff > 0; ++j) {
if (j == size)
j = 0;
ColumnLayoutData col = (ColumnLayoutData) columns.get(j);
if (col instanceof ColumnWeightData) {
++widths[j];
--diff;
}
}
}
if (increase) {
table.setSize(area.width, area.height);
}
for (int j = 0; j < size; j++) {
tableColumns[j].setWidth(widths[j]);
}
if (!increase) {
table.setSize(area.width, area.height);
}
}
}