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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 net.sourceforge.phpdt.internal.ui.util.SWTUtil;
  14
  15 import org.eclipse.swt.SWT;
  16 import org.eclipse.swt.events.SelectionEvent;
  17 import org.eclipse.swt.events.SelectionListener;
  18 import org.eclipse.swt.layout.GridData;
  19 import org.eclipse.swt.widgets.Button;
  20 import org.eclipse.swt.widgets.Composite;
  21 import org.eclipse.swt.widgets.Control;
  22
  23
  24
  25 /**
  26  * Dialog Field containing a single button such as a radio or checkbox button.
  27  */
  28 public class SelectionButtonDialogField extends DialogField {
  29
  30         private Button fButton;
  31         private boolean fIsSelected;
  32         private DialogField[] fAttachedDialogFields;
  33         private int fButtonStyle;
  34
  35         /**
  36          * Creates a selection button.
  37          * Allowed button styles: SWT.RADIO, SWT.CHECK, SWT.TOGGLE, SWT.PUSH
  38          */
  39         public SelectionButtonDialogField(int buttonStyle) {
  40                 super();
  41                 fIsSelected= false;
  42                 fAttachedDialogFields= null;
  43                 fButtonStyle= buttonStyle;
  44         }
  45
  46         /**
  47          * Attaches a field to the selection state of the selection button.
  48          * The attached field will be disabled if the selection button is not selected.
  49          */
  50         public void attachDialogField(DialogField dialogField) {
  51                 attachDialogFields(new DialogField[] { dialogField });
  52         }
  53
  54         /**
  55          * Attaches fields to the selection state of the selection button.
  56          * The attached fields will be disabled if the selection button is not selected.
  57          */
  58         public void attachDialogFields(DialogField[] dialogFields) {
  59                 fAttachedDialogFields= dialogFields;
  60                 for (int i= 0; i < dialogFields.length; i++) {
  61                         dialogFields[i].setEnabled(fIsSelected);
  62                 }
  63         }
  64
  65         /**
  66          * Returns <code>true</code> is  teh gived field is attached to the selection button.
  67          */
  68         public boolean isAttached(DialogField editor) {
  69                 if (fAttachedDialogFields != null) {
  70                         for (int i=0; i < fAttachedDialogFields.length; i++) {
  71                                 if (fAttachedDialogFields[i] == editor) {
  72                                         return true;
  73                                 }
  74                         }
  75                 }
  76                 return false;
  77         }
  78
  79         // ------- layout helpers
  80
  81         /*
  82          * @see DialogField#doFillIntoGrid
  83          */
  84         public Control[] doFillIntoGrid(Composite parent, int nColumns) {
  85                 assertEnoughColumns(nColumns);
  86
  87                 Button button= getSelectionButton(parent);
  88                 GridData gd= new GridData();
  89                 gd.horizontalSpan= nColumns;
  90                 gd.horizontalAlignment= GridData.FILL;
  91                 if (fButtonStyle == SWT.PUSH) {
  92                         gd.heightHint = SWTUtil.getButtonHeigthHint(button);
  93                         gd.widthHint = SWTUtil.getButtonWidthHint(button);
  94                 }
  95
  96                 button.setLayoutData(gd);
  97
  98                 return new Control[] { button };
  99         }
 100
 101         /*
 102          * @see DialogField#getNumberOfControls
 103          */
 104         public int getNumberOfControls() {
 105                 return 1;
 106         }
 107
 108         // ------- ui creation
 109
 110         /**
 111          * Returns the selection button widget. When called the first time, the widget will be created.
 112          * @param The parent composite when called the first time, or <code>null</code>
 113          * after.
 114          */
 115         public Button getSelectionButton(Composite group) {
 116                 if (fButton == null) {
 117                         assertCompositeNotNull(group);
 118
 119                         fButton= new Button(group, fButtonStyle);
 120                         fButton.setFont(group.getFont());
 121                         fButton.setText(fLabelText);
 122                         fButton.setEnabled(isEnabled());
 123                         fButton.setSelection(fIsSelected);
 124                         fButton.addSelectionListener(new SelectionListener() {
 125                                 public void widgetDefaultSelected(SelectionEvent e) {
 126                                         doWidgetSelected(e);
 127                                 }
 128                                 public void widgetSelected(SelectionEvent e) {
 129                                         doWidgetSelected(e);
 130                                 }
 131                         });
 132                 }
 133                 return fButton;
 134         }
 135
 136         private void doWidgetSelected(SelectionEvent e) {
 137                 if (isOkToUse(fButton)) {
 138                         changeValue(fButton.getSelection());
 139                 }
 140         }
 141
 142         private void changeValue(boolean newState) {
 143                 if (fIsSelected != newState) {
 144                         fIsSelected= newState;
 145                         if (fAttachedDialogFields != null) {
 146                                 boolean focusSet= false;
 147                                 for (int i= 0; i < fAttachedDialogFields.length; i++) {
 148                                         fAttachedDialogFields[i].setEnabled(fIsSelected);
 149                                         if (fIsSelected && !focusSet) {
 150                                                 focusSet= fAttachedDialogFields[i].setFocus();
 151                                         }
 152                                 }
 153                         }
 154                         dialogFieldChanged();
 155                 } else if (fButtonStyle == SWT.PUSH) {
 156                         dialogFieldChanged();
 157                 }
 158         }
 159
 160         // ------ model access
 161
 162         /**
 163          * Returns the selection state of the button.
 164          */
 165         public boolean isSelected() {
 166                 return fIsSelected;
 167         }
 168
 169         /**
 170          * Sets the selection state of the button.
 171          */
 172         public void setSelection(boolean selected) {
 173                 changeValue(selected);
 174                 if (isOkToUse(fButton)) {
 175                         fButton.setSelection(selected);
 176                 }
 177         }
 178
 179         // ------ enable / disable management
 180
 181         /*
 182          * @see DialogField#updateEnableState
 183          */
 184         protected void updateEnableState() {
 185                 super.updateEnableState();
 186                 if (isOkToUse(fButton)) {
 187                         fButton.setEnabled(isEnabled());
 188                 }
 189         }
 190
 191
 192
 193
 194 }