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annotate org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet006Spreadsheet.d @ 99:5d5bd660917f

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build some databind snippets
author Frank Benoit <benoit@tionex.de>
date Wed, 22 Apr 2009 18:59:26 +0200
parents 6086085e153d
children
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Brad Reynolds - bug 116920
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11 *******************************************************************************/
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12
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13 module org.eclipse.jface.examples.databinding.snippets.Snippet006Spreadsheet;
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14
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15 import java.lang.all;
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16 import tango.io.Stdout;
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17
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18 import java.text.NumberFormat;
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19 import java.text.ParseException;
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20
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21 import org.eclipse.core.databinding.observable.Realm;
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22 import org.eclipse.core.databinding.observable.list.WritableList;
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23 import org.eclipse.core.databinding.observable.value.ComputedValue;
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24 import org.eclipse.core.databinding.observable.value.IObservableValue;
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25 import org.eclipse.core.databinding.observable.value.WritableValue;
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26 import org.eclipse.jface.databinding.swt.SWTObservables;
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27 import org.eclipse.jface.internal.databinding.provisional.swt.TableUpdater;
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28 import org.eclipse.jface.layout.GridLayoutFactory;
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29 import org.eclipse.swt.SWT;
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30 import org.eclipse.swt.custom.ControlEditor;
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31 import org.eclipse.swt.custom.TableCursor;
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32 import org.eclipse.swt.events.KeyAdapter;
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33 import org.eclipse.swt.events.KeyEvent;
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34 import org.eclipse.swt.events.SelectionAdapter;
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35 import org.eclipse.swt.events.SelectionEvent;
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36 import org.eclipse.swt.widgets.Display;
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37 import org.eclipse.swt.widgets.Shell;
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38 import org.eclipse.swt.widgets.Table;
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39 import org.eclipse.swt.widgets.TableColumn;
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40 import org.eclipse.swt.widgets.TableItem;
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41 import org.eclipse.swt.widgets.Text;
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42
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43 /**
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44 * @since 1.1
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45 *
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46 */
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47 public class Snippet006Spreadsheet {
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49 private static const int COUNTER_UPDATE_DELAY = 1000;
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51 private static const int NUM_COLUMNS = 6;
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53 private static const int NUM_ROWS = 16;
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55 /**
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56 * 0 for no output, 1 for some, 2 for more
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57 */
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58 private static int DEBUG_LEVEL = 0;
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60 /**
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61 * If true, there will be a automatic counter at B1.
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62 */
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63 private static bool FUNKY_COUNTER = false;
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65 /**
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66 * // * If true, all formulas (except for row 1 and column A) will be the
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67 * sum of the values of their left and top neighbouring cells.
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68 */
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69 private static bool FUNKY_FORMULAS = true;
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70
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71 static WritableValue[][] cellFormulas;
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72
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73 static ComputedValue[][] cellValues;
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75 static this(){
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76 cellFormulas = new WritableValue[][](NUM_ROWS,NUM_COLUMNS);
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77 cellValues = new ComputedValue[][](NUM_ROWS,NUM_COLUMNS);
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78 }
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80 static class ComputedCellValue : ComputedValue {
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81 private const IObservableValue cellFormula;
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83 private bool calculating;
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85 this(IObservableValue cellFormula) {
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86 this.cellFormula = cellFormula;
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87 }
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89 protected Object calculate() {
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90 if (calculating) {
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91 return stringcast("#cycle");
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92 }
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93 try {
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94 calculating = true;
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95 return evaluate(cellFormula.getValue());
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96 } finally {
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97 calculating = false;
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98 }
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99 }
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101 private Object evaluate(Object value) {
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102 if (DEBUG_LEVEL >= 2) {
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103 Stdout.formatln("evaluating {} ...", this);
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104 }
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105 if (value is null) {
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106 return stringcast("");
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107 }
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108 try {
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109 String s = stringcast( value );
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110 if (!s.startsWith("=")) {
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111 return stringcast(s);
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112 }
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113 String addition = s.substring(1);
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114 int indexOfPlus = addition.indexOf('+');
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115 String operand1 = addition.substring(0, indexOfPlus);
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116 double value1 = eval(operand1);
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117 String operand2 = addition.substring(indexOfPlus + 1);
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118 double value2 = eval(operand2);
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119 return stringcast(NumberFormat.getNumberInstance().format(value1 + value2));
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120 } catch (Exception ex) {
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121 return stringcast(ex.msg);
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122 }
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123 }
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125 /**
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126 * @param s
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127 * @return
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128 * @throws ParseException
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129 */
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130 private double eval(String s) {
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131 if (s.length() is 0) {
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132 return 0;
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133 }
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134 dchar character = s.charAt(0);
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135 if (Character.isLetter(character)) {
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136 character = Character.toLowerCase(character);
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137 // reference to other cell
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138 int columnIndex = character - 'a';
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139 int rowIndex = 0;
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140 rowIndex = NumberFormat.getNumberInstance().parse(
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141 s.substring(1)).intValue() - 1;
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142 String value = stringcast( cellValues[rowIndex][columnIndex]
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143 .getValue());
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144 return value.length() is 0 ? 0 : NumberFormat
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145 .getNumberInstance().parse(value).doubleValue();
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146 }
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147 return NumberFormat.getNumberInstance().parse(s).doubleValue();
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148 }
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149 }
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151 protected static int counter;
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152 static class LocalTableUpdater : TableUpdater {
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153 this( Table t, WritableList l ){
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154 super( t, l );
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155 }
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156 protected void updateItem(int rowIndex, TableItem item, Object element) {
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157 if (DEBUG_LEVEL >= 1) {
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158 Stdout.formatln("updating row {}", rowIndex);
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159 }
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160 for (int j = 0; j < NUM_COLUMNS; j++) {
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161 item.setText(j, stringcast( cellValues[rowIndex][j]
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162 .getValue()));
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163 }
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164 }
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165 }
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166 static class CursorSelectionListener : SelectionAdapter {
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167 TableCursor cursor;
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168 Table table;
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169 ControlEditor editor;
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170
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171 this(TableCursor c, Table t,ControlEditor e){
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172 cursor = c;
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173 table = t;
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174 editor = e;
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175 }
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176 // when the TableEditor is over a cell, select the
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177 // corresponding row
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178 // in
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179 // the table
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180 public void widgetSelected(SelectionEvent e) {
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181 table.setSelection([ cursor.getRow() ]);
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182 }
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183
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184 // when the user hits "ENTER" in the TableCursor, pop up a
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185 // text
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186 // editor so that
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187 // they can change the text of the cell
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188 public void widgetDefaultSelected(SelectionEvent e) {
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189 final Text text = new Text(cursor, SWT.NONE);
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190 TableItem row = cursor.getRow();
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191 int rowIndex = table.indexOf(row);
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192 int columnIndex = cursor.getColumn();
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193 text
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194 .setText(stringcast( cellFormulas[rowIndex][columnIndex]
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195 .getValue()));
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196 text.addKeyListener(new TextKeyListener(table, cursor, text ));
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197 editor.setEditor(text);
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198 text.setFocus();
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199 }
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200 }
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201 static class TextKeyListener : KeyAdapter {
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202 Table table;
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203 TableCursor cursor;
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204 Text text;
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205 this(Table t, TableCursor c, Text t2){
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206 cursor = c;
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207 table = t;
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208 text = t2;
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209 }
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210 public void keyPressed(KeyEvent e) {
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211 // close the text editor and copy the data over
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212 // when the user hits "ENTER"
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213 if (e.character is SWT.CR) {
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214 TableItem row = cursor.getRow();
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215 int rowIndex = table.indexOf(row);
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216 int columnIndex = cursor.getColumn();
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217 cellFormulas[rowIndex][columnIndex]
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218 .setValue(stringcast(text.getText()));
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219 text.dispose();
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220 }
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221 // close the text editor when the user hits
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222 // "ESC"
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223 if (e.character is SWT.ESC) {
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224 text.dispose();
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225 }
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226 }
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227 }
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228 static class CursorKeyListener : KeyAdapter {
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229 TableCursor cursor;
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230 this(TableCursor c){
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231 cursor = c;
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232 }
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233 public void keyPressed(KeyEvent e) {
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234 if (e.keyCode is SWT.MOD1 || e.keyCode is SWT.MOD2
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235 || (e.stateMask & SWT.MOD1) !is 0
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236 || (e.stateMask & SWT.MOD2) !is 0) {
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237 cursor.setVisible(false);
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238 }
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239 }
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240 }
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241 static class TableKeyListener : KeyAdapter {
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242 Table table;
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243 TableCursor cursor;
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244 this(Table t, TableCursor c){
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245 cursor = c;
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246 table = t;
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247 }
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248 public void keyReleased(KeyEvent e) {
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249 if (e.keyCode is SWT.MOD1
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250 && (e.stateMask & SWT.MOD2) !is 0)
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251 return;
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252 if (e.keyCode is SWT.MOD2
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253 && (e.stateMask & SWT.MOD1) !is 0)
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254 return;
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255 if (e.keyCode !is SWT.MOD1
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256 && (e.stateMask & SWT.MOD1) !is 0)
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257 return;
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258 if (e.keyCode !is SWT.MOD2
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259 && (e.stateMask & SWT.MOD2) !is 0)
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260 return;
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261
99
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262 TableItem[] selection = table.getSelection();
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263 TableItem row = (selection.length is 0) ? table
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264 .getItem(table.getTopIndex()) : selection[0];
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265 table.showItem(row);
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266 cursor.setSelection(row, 0);
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267 cursor.setVisible(true);
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268 cursor.setFocus();
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269 }
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270 }
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271 public static void main(String[] args) {
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272
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273 final Display display = new Display();
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274 Realm.runWithDefault(SWTObservables.getRealm(display), dgRunnable( (Display display_) {
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275 Shell shell = new Shell(display_);
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276 shell.setText("Data Binding Snippet 006");
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277
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278 final Table table = new Table(shell, SWT.BORDER | SWT.MULTI
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279 | SWT.FULL_SELECTION | SWT.VIRTUAL);
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280 table.setLinesVisible(true);
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281 table.setHeaderVisible(true);
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282
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283 for (int i = 0; i < NUM_COLUMNS; i++) {
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284 TableColumn tableColumn = new TableColumn(table, SWT.NONE);
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285 tableColumn.setText(Character.toString(cast(char) ('A' + i)));
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286 tableColumn.setWidth(60);
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287 }
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288 WritableList list = new WritableList();
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289 for (int i = 0; i < NUM_ROWS; i++) {
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290 list.add(new Object());
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291 for (int j = 0; j < NUM_COLUMNS; j++) {
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292 cellFormulas[i][j] = new WritableValue();
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293 cellValues[i][j] = new ComputedCellValue(
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294 cellFormulas[i][j]);
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295 if (!FUNKY_FORMULAS || i is 0 || j is 0) {
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296 cellFormulas[i][j].setValue(stringcast(""));
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297 } else {
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298 cellFormulas[i][j].setValue(stringcast("="
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299 ~ cellReference(i - 1, j) ~ "+"
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300 ~ cellReference(i, j - 1)));
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301 }
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302 }
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303 }
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304
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305 new LocalTableUpdater( table, list );
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306
99
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307 if (FUNKY_COUNTER) {
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308 // counter in A1
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309 display_.asyncExec(dgRunnable(&output, display_));
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310 }
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311
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312 // create a TableCursor to navigate around the table
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313 final TableCursor cursor = new TableCursor(table, SWT.NONE);
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314 // create an editor to edit the cell when the user hits "ENTER"
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315 // while over a cell in the table
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316 final ControlEditor editor = new ControlEditor(cursor);
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317 editor.grabHorizontal = true;
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318 editor.grabVertical = true;
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319
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320 cursor.addSelectionListener(new CursorSelectionListener( cursor, table, editor ));
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321 // Hide the TableCursor when the user hits the "MOD1" or "MOD2"
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322 // key.
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323 // This alows the user to select multiple items in the table.
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324 cursor.addKeyListener(new CursorKeyListener(cursor) );
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325 // Show the TableCursor when the user releases the "MOD2" or
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326 // "MOD1" key.
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327 // This signals the end of the multiple selection task.
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328 table.addKeyListener(new TableKeyListener(table, cursor));
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329
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330 GridLayoutFactory.fillDefaults().generateLayout(shell);
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331 shell.setSize(400, 300);
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332 shell.open();
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333
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334 // The SWT event loop
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335 while (!shell.isDisposed()) {
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336 if (!display_.readAndDispatch()) {
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337 display_.sleep();
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338 }
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339 }
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340 }, display));
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341 display.dispose();
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342 }
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343 private void output( Display display ){
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344 cellFormulas[0][1].setValue(stringcast(Format("{}", counter++)));
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345 display.timerExec(COUNTER_UPDATE_DELAY, dgRunnable( &output, display ));
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346 }
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347
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348 private static String cellReference(int rowIndex, int columnIndex) {
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349 String cellReference = Format("{}{}", (cast(char) ('A' + columnIndex))
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350 , (rowIndex + 1));
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351 return cellReference;
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352 }
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354 }
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355
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356 void main( String[] args ){
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357 Snippet006Spreadsheet.main(args);
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358 }