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   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.wizards.dialogfields;
  12
  13 import org.eclipse.jface.util.Assert;
  14 import org.eclipse.swt.SWT;
  15 import org.eclipse.swt.events.SelectionEvent;
  16 import org.eclipse.swt.events.SelectionListener;
  17 import org.eclipse.swt.layout.GridData;
  18 import org.eclipse.swt.layout.GridLayout;
  19 import org.eclipse.swt.widgets.Button;
  20 import org.eclipse.swt.widgets.Composite;
  21 import org.eclipse.swt.widgets.Control;
  22 import org.eclipse.swt.widgets.Group;
  23 import org.eclipse.swt.widgets.Label;
  24
  25 /**
  26  * Dialog field describing a group with buttons (Checkboxes, radio buttons..)
  27  */
  28 public class SelectionButtonDialogFieldGroup extends DialogField {
  29
  30         private Composite fButtonComposite;
  31
  32         private Button[] fButtons;
  33
  34         private String[] fButtonNames;
  35
  36         private boolean[] fButtonsSelected;
  37
  38         private boolean[] fButtonsEnabled;
  39
  40         private int fGroupBorderStyle;
  41
  42         private int fGroupNumberOfColumns;
  43
  44         private int fButtonsStyle;
  45
  46         /**
  47          * Creates a group without border.
  48          */
  49         public SelectionButtonDialogFieldGroup(int buttonsStyle,
  50                         String[] buttonNames, int nColumns) {
  51                 this(buttonsStyle, buttonNames, nColumns, SWT.NONE);
  52         }
  53
  54         /**
  55          * Creates a group with border (label in border). Accepted button styles
  56          * are: SWT.RADIO, SWT.CHECK, SWT.TOGGLE For border styles see
  57          * <code>Group</code>
  58          */
  59         public SelectionButtonDialogFieldGroup(int buttonsStyle,
  60                         String[] buttonNames, int nColumns, int borderStyle) {
  61                 super();
  62
  63                 Assert.isTrue(buttonsStyle == SWT.RADIO || buttonsStyle == SWT.CHECK
  64                                 || buttonsStyle == SWT.TOGGLE);
  65                 fButtonNames = buttonNames;
  66
  67                 int nButtons = buttonNames.length;
  68                 fButtonsSelected = new boolean[nButtons];
  69                 fButtonsEnabled = new boolean[nButtons];
  70                 for (int i = 0; i < nButtons; i++) {
  71                         fButtonsSelected[i] = false;
  72                         fButtonsEnabled[i] = true;
  73                 }
  74                 if (fButtonsStyle == SWT.RADIO) {
  75                         fButtonsSelected[0] = true;
  76                 }
  77
  78                 fGroupBorderStyle = borderStyle;
  79                 fGroupNumberOfColumns = (nColumns <= 0) ? nButtons : nColumns;
  80
  81                 fButtonsStyle = buttonsStyle;
  82
  83         }
  84
  85         // ------- layout helpers
  86
  87         /*
  88          * @see DialogField#doFillIntoGrid
  89          */
  90         public Control[] doFillIntoGrid(Composite parent, int nColumns) {
  91                 assertEnoughColumns(nColumns);
  92
  93                 if (fGroupBorderStyle == SWT.NONE) {
  94                         Label label = getLabelControl(parent);
  95                         label.setLayoutData(gridDataForLabel(1));
  96
  97                         Composite buttonsgroup = getSelectionButtonsGroup(parent);
  98                         GridData gd = new GridData();
  99                         gd.horizontalSpan = nColumns - 1;
 100                         buttonsgroup.setLayoutData(gd);
 101
 102                         return new Control[] { label, buttonsgroup };
 103                 } else {
 104                         Composite buttonsgroup = getSelectionButtonsGroup(parent);
 105                         GridData gd = new GridData();
 106                         gd.horizontalSpan = nColumns;
 107                         buttonsgroup.setLayoutData(gd);
 108
 109                         return new Control[] { buttonsgroup };
 110                 }
 111         }
 112
 113         /*
 114          * @see DialogField#doFillIntoGrid
 115          */
 116         public int getNumberOfControls() {
 117                 return (fGroupBorderStyle == SWT.NONE) ? 2 : 1;
 118         }
 119
 120         // ------- ui creation
 121
 122         private Button createSelectionButton(int index, Composite group,
 123                         SelectionListener listener) {
 124                 Button button = new Button(group, fButtonsStyle | SWT.LEFT);
 125                 button.setFont(group.getFont());
 126                 button.setText(fButtonNames[index]);
 127                 button.setEnabled(isEnabled() && fButtonsEnabled[index]);
 128                 button.setSelection(fButtonsSelected[index]);
 129                 button.addSelectionListener(listener);
 130                 button.setLayoutData(new GridData());
 131                 return button;
 132         }
 133
 134         /**
 135          * Returns the group widget. When called the first time, the widget will be
 136          * created.
 137          *
 138          * @param The
 139          *            parent composite when called the first time, or
 140          *            <code>null</code> after.
 141          */
 142         public Composite getSelectionButtonsGroup(Composite parent) {
 143                 if (fButtonComposite == null) {
 144                         assertCompositeNotNull(parent);
 145
 146                         GridLayout layout = new GridLayout();
 147                         layout.makeColumnsEqualWidth = true;
 148                         layout.numColumns = fGroupNumberOfColumns;
 149
 150                         if (fGroupBorderStyle != SWT.NONE) {
 151                                 Group group = new Group(parent, fGroupBorderStyle);
 152                                 if (fLabelText != null && fLabelText.length() > 0) {
 153                                         group.setText(fLabelText);
 154                                 }
 155                                 fButtonComposite = group;
 156                         } else {
 157                                 fButtonComposite = new Composite(parent, SWT.NULL);
 158                                 layout.marginHeight = 0;
 159                                 layout.marginWidth = 0;
 160                         }
 161
 162                         fButtonComposite.setLayout(layout);
 163
 164                         SelectionListener listener = new SelectionListener() {
 165                                 public void widgetDefaultSelected(SelectionEvent e) {
 166                                         doWidgetSelected(e);
 167                                 }
 168
 169                                 public void widgetSelected(SelectionEvent e) {
 170                                         doWidgetSelected(e);
 171                                 }
 172                         };
 173                         int nButtons = fButtonNames.length;
 174                         fButtons = new Button[nButtons];
 175                         for (int i = 0; i < nButtons; i++) {
 176                                 fButtons[i] = createSelectionButton(i, fButtonComposite,
 177                                                 listener);
 178                         }
 179                         int nRows = nButtons / fGroupNumberOfColumns;
 180                         int nFillElements = nRows * fGroupNumberOfColumns - nButtons;
 181                         for (int i = 0; i < nFillElements; i++) {
 182                                 createEmptySpace(fButtonComposite);
 183                         }
 184                 }
 185                 return fButtonComposite;
 186         }
 187
 188         /**
 189          * Returns a button from the group or <code>null</code> if not yet
 190          * created.
 191          */
 192         public Button getSelectionButton(int index) {
 193                 if (index >= 0 && index < fButtons.length) {
 194                         return fButtons[index];
 195                 }
 196                 return null;
 197         }
 198
 199         private void doWidgetSelected(SelectionEvent e) {
 200                 Button button = (Button) e.widget;
 201                 for (int i = 0; i < fButtons.length; i++) {
 202                         if (fButtons[i] == button) {
 203                                 fButtonsSelected[i] = button.getSelection();
 204                                 dialogFieldChanged();
 205                                 return;
 206                         }
 207                 }
 208         }
 209
 210         // ------ model access
 211
 212         /**
 213          * Returns the selection state of a button contained in the group.
 214          *
 215          * @param The
 216          *            index of the button
 217          */
 218         public boolean isSelected(int index) {
 219                 if (index >= 0 && index < fButtonsSelected.length) {
 220                         return fButtonsSelected[index];
 221                 }
 222                 return false;
 223         }
 224
 225         /**
 226          * Sets the selection state of a button contained in the group.
 227          */
 228         public void setSelection(int index, boolean selected) {
 229                 if (index >= 0 && index < fButtonsSelected.length) {
 230                         if (fButtonsSelected[index] != selected) {
 231                                 fButtonsSelected[index] = selected;
 232                                 if (fButtons != null) {
 233                                         Button button = fButtons[index];
 234                                         if (isOkToUse(button)) {
 235                                                 button.setSelection(selected);
 236                                         }
 237                                 }
 238                         }
 239                 }
 240         }
 241
 242         // ------ enable / disable management
 243
 244         protected void updateEnableState() {
 245                 super.updateEnableState();
 246                 if (fButtons != null) {
 247                         boolean enabled = isEnabled();
 248                         for (int i = 0; i < fButtons.length; i++) {
 249                                 Button button = fButtons[i];
 250                                 if (isOkToUse(button)) {
 251                                         button.setEnabled(enabled && fButtonsEnabled[i]);
 252                                 }
 253                         }
 254                 }
 255         }
 256
 257         /**
 258          * Sets the enable state of a button contained in the group.
 259          */
 260         public void enableSelectionButton(int index, boolean enable) {
 261                 if (index >= 0 && index < fButtonsEnabled.length) {
 262                         fButtonsEnabled[index] = enable;
 263                         if (fButtons != null) {
 264                                 Button button = fButtons[index];
 265                                 if (isOkToUse(button)) {
 266                                         button.setEnabled(isEnabled() && enable);
 267                                 }
 268                         }
 269                 }
 270         }
 271 }