net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/util/TableLayoutComposite.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.util;
  12
  13 import java.util.ArrayList;
  14 import java.util.List;
  15
  16 //incastrix
  17 //import org.eclipse.jface.text.Assert;
  18 import org.eclipse.core.runtime.Assert;
  19 import org.eclipse.jface.viewers.ColumnLayoutData;
  20 import org.eclipse.jface.viewers.ColumnPixelData;
  21 import org.eclipse.jface.viewers.ColumnWeightData;
  22 import org.eclipse.swt.SWT;
  23 import org.eclipse.swt.events.ControlAdapter;
  24 import org.eclipse.swt.events.ControlEvent;
  25 import org.eclipse.swt.graphics.Point;
  26 import org.eclipse.swt.graphics.Rectangle;
  27 import org.eclipse.swt.widgets.Composite;
  28 import org.eclipse.swt.widgets.Table;
  29 import org.eclipse.swt.widgets.TableColumn;
  30
  31 /**
  32  * A special composite to layout columns inside a table. The composite is needed
  33  * since we have to layout the columns "before" the actual table gets layouted.
  34  * Hence we can't use a normal layout manager.
  35  */
  36 public class TableLayoutComposite extends Composite {
  37
  38         private List columns = new ArrayList();
  39
  40         /**
  41          * Creates a new <code>TableLayoutComposite</code>.
  42          */
  43         public TableLayoutComposite(Composite parent, int style) {
  44                 super(parent, style);
  45                 addControlListener(new ControlAdapter() {
  46                         public void controlResized(ControlEvent e) {
  47                                 Rectangle area = getClientArea();
  48                                 Table table = (Table) getChildren()[0];
  49                                 Point preferredSize = computeTableSize(table);
  50                                 int width = area.width - 2 * table.getBorderWidth();
  51                                 if (preferredSize.y > area.height) {
  52                                         // Subtract the scrollbar width from the total column width
  53                                         // if a vertical scrollbar will be required
  54                                         Point vBarSize = table.getVerticalBar().getSize();
  55                                         width -= vBarSize.x;
  56                                 }
  57                                 layoutTable(table, width, area, table.getSize().x < area.width);
  58                         }
  59                 });
  60         }
  61
  62         /**
  63          * Adds a new column of data to this table layout.
  64          *
  65          * @param data
  66          *            the column layout data
  67          */
  68         public void addColumnData(ColumnLayoutData data) {
  69                 columns.add(data);
  70         }
  71
  72         // ---- Helpers
  73         // -------------------------------------------------------------------------------------
  74
  75         private Point computeTableSize(Table table) {
  76                 Point result = table.computeSize(SWT.DEFAULT, SWT.DEFAULT);
  77
  78                 int width = 0;
  79                 int size = columns.size();
  80                 for (int i = 0; i < size; ++i) {
  81                         ColumnLayoutData layoutData = (ColumnLayoutData) columns.get(i);
  82                         if (layoutData instanceof ColumnPixelData) {
  83                                 ColumnPixelData col = (ColumnPixelData) layoutData;
  84                                 width += col.width;
  85                         } else if (layoutData instanceof ColumnWeightData) {
  86                                 ColumnWeightData col = (ColumnWeightData) layoutData;
  87                                 width += col.minimumWidth;
  88                         } else {
  89                                 Assert.isTrue(false, "Unknown column layout data"); //$NON-NLS-1$
  90                         }
  91                 }
  92                 if (width > result.x)
  93                         result.x = width;
  94                 return result;
  95         }
  96
  97         private void layoutTable(Table table, int width, Rectangle area,
  98                         boolean increase) {
  99                 // XXX: Layout is being called with an invalid value the first time
 100                 // it is being called on Linux. This method resets the
 101                 // Layout to null so we make sure we run it only when
 102                 // the value is OK.
 103                 if (width <= 1)
 104                         return;
 105
 106                 TableColumn[] tableColumns = table.getColumns();
 107                 int size = Math.min(columns.size(), tableColumns.length);
 108                 int[] widths = new int[size];
 109                 int fixedWidth = 0;
 110                 int numberOfWeightColumns = 0;
 111                 int totalWeight = 0;
 112
 113                 // First calc space occupied by fixed columns
 114                 for (int i = 0; i < size; i++) {
 115                         ColumnLayoutData col = (ColumnLayoutData) columns.get(i);
 116                         if (col instanceof ColumnPixelData) {
 117                                 int pixels = ((ColumnPixelData) col).width;
 118                                 widths[i] = pixels;
 119                                 fixedWidth += pixels;
 120                         } else if (col instanceof ColumnWeightData) {
 121                                 ColumnWeightData cw = (ColumnWeightData) col;
 122                                 numberOfWeightColumns++;
 123                                 // first time, use the weight specified by the column data,
 124                                 // otherwise use the actual width as the weight
 125                                 // int weight = firstTime ? cw.weight :
 126                                 // tableColumns[i].getWidth();
 127                                 int weight = cw.weight;
 128                                 totalWeight += weight;
 129                         } else {
 130                                 Assert.isTrue(false, "Unknown column layout data"); //$NON-NLS-1$
 131                         }
 132                 }
 133
 134                 // Do we have columns that have a weight
 135                 if (numberOfWeightColumns > 0) {
 136                         // Now distribute the rest to the columns with weight.
 137                         int rest = width - fixedWidth;
 138                         int totalDistributed = 0;
 139                         for (int i = 0; i < size; ++i) {
 140                                 ColumnLayoutData col = (ColumnLayoutData) columns.get(i);
 141                                 if (col instanceof ColumnWeightData) {
 142                                         ColumnWeightData cw = (ColumnWeightData) col;
 143                                         // calculate weight as above
 144                                         // int weight = firstTime ? cw.weight :
 145                                         // tableColumns[i].getWidth();
 146                                         int weight = cw.weight;
 147                                         int pixels = totalWeight == 0 ? 0 : weight * rest
 148                                                         / totalWeight;
 149                                         if (pixels < cw.minimumWidth)
 150                                                 pixels = cw.minimumWidth;
 151                                         totalDistributed += pixels;
 152                                         widths[i] = pixels;
 153                                 }
 154                         }
 155
 156                         // Distribute any remaining pixels to columns with weight.
 157                         int diff = rest - totalDistributed;
 158                         for (int i = 0; diff > 0; ++i) {
 159                                 if (i == size)
 160                                         i = 0;
 161                                 ColumnLayoutData col = (ColumnLayoutData) columns.get(i);
 162                                 if (col instanceof ColumnWeightData) {
 163                                         ++widths[i];
 164                                         --diff;
 165                                 }
 166                         }
 167                 }
 168
 169                 if (increase) {
 170                         table.setSize(area.width, area.height);
 171                 }
 172                 for (int i = 0; i < size; i++) {
 173                         tableColumns[i].setWidth(widths[i]);
 174                 }
 175                 if (!increase) {
 176                         table.setSize(area.width, area.height);
 177                 }
 178         }
 179 }