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   1 package net.sourceforge.phpdt.internal.ui.dialogs;
   2
   3 import java.util.ArrayList;
   4 import java.util.Arrays;
   5 import java.util.List;
   6
   7 import net.sourceforge.phpdt.internal.ui.viewsupport.ContainerCheckedTreeViewer;
   8
   9 import org.eclipse.core.runtime.IStatus;
  10 import org.eclipse.jface.dialogs.IDialogConstants;
  11 import org.eclipse.jface.viewers.CheckStateChangedEvent;
  12 import org.eclipse.jface.viewers.CheckboxTreeViewer;
  13 import org.eclipse.jface.viewers.ICheckStateListener;
  14 import org.eclipse.jface.viewers.ILabelProvider;
  15 import org.eclipse.jface.viewers.ITreeContentProvider;
  16 import org.eclipse.jface.viewers.ViewerFilter;
  17 import org.eclipse.jface.viewers.ViewerSorter;
  18 import org.eclipse.swt.SWT;
  19 import org.eclipse.swt.custom.BusyIndicator;
  20 import org.eclipse.swt.events.SelectionAdapter;
  21 import org.eclipse.swt.events.SelectionEvent;
  22 import org.eclipse.swt.events.SelectionListener;
  23 import org.eclipse.swt.layout.GridData;
  24 import org.eclipse.swt.layout.GridLayout;
  25 import org.eclipse.swt.widgets.Button;
  26 import org.eclipse.swt.widgets.Composite;
  27 import org.eclipse.swt.widgets.Control;
  28 import org.eclipse.swt.widgets.Label;
  29 import org.eclipse.swt.widgets.Shell;
  30 import org.eclipse.swt.widgets.Tree;
  31
  32 /**
  33  * A class to select elements out of a tree structure.
  34  */
  35 public class CheckedTreeSelectionDialog extends SelectionStatusDialog {
  36
  37         private CheckboxTreeViewer fViewer;
  38
  39         private ILabelProvider fLabelProvider;
  40
  41         private ITreeContentProvider fContentProvider;
  42
  43         private ISelectionValidator fValidator = null;
  44
  45         private ViewerSorter fSorter;
  46
  47         private String fEmptyListMessage = "No entries available";
  48
  49         private IStatus fCurrStatus = new StatusInfo();
  50
  51         private List fFilters;
  52
  53         private Object fInput;
  54
  55         private boolean fIsEmpty;
  56
  57         private int fWidth = 60;
  58
  59         private int fHeight = 18;
  60
  61         private boolean fContainerMode;
  62
  63         private Object[] fExpandedElements;
  64
  65         /**
  66          * Constructs an instance of <code>ElementTreeSelectionDialog</code>.
  67          *
  68          * @param labelProvider
  69          *            the label provider to render the entries
  70          * @param contentProvider
  71          *            the content provider to evaluate the tree structure
  72          */
  73         public CheckedTreeSelectionDialog(Shell parent,
  74                         ILabelProvider labelProvider, ITreeContentProvider contentProvider) {
  75                 super(parent);
  76
  77                 fLabelProvider = labelProvider;
  78                 fContentProvider = contentProvider;
  79
  80                 setResult(new ArrayList(0));
  81                 setStatusLineAboveButtons(true);
  82
  83                 fContainerMode = false;
  84                 fExpandedElements = null;
  85
  86                 int shellStyle = getShellStyle();
  87                 setShellStyle(shellStyle | SWT.MAX | SWT.RESIZE);
  88         }
  89
  90         /**
  91          * If set, the checked /gray state of containers (inner nodes) is derived
  92          * from the checked state of its leaf nodes.
  93          *
  94          * @param containerMode
  95          *            The containerMode to set
  96          */
  97         public void setContainerMode(boolean containerMode) {
  98                 fContainerMode = containerMode;
  99         }
 100
 101         /**
 102          * Sets the initial selection. Convenience method.
 103          *
 104          * @param selection
 105          *            the initial selection.
 106          */
 107         public void setInitialSelection(Object selection) {
 108                 setInitialSelections(new Object[] { selection });
 109         }
 110
 111         /**
 112          * Sets the message to be displayed if the list is empty.
 113          *
 114          * @param message
 115          *            the message to be displayed.
 116          */
 117         public void setEmptyListMessage(String message) {
 118                 fEmptyListMessage = message;
 119         }
 120
 121         /**
 122          * Sets the sorter used by the tree viewer.
 123          */
 124         public void setSorter(ViewerSorter sorter) {
 125                 fSorter = sorter;
 126         }
 127
 128         /**
 129          * Adds a filter to the tree viewer.
 130          *
 131          * @param filter
 132          *            a filter.
 133          */
 134         public void addFilter(ViewerFilter filter) {
 135                 if (fFilters == null)
 136                         fFilters = new ArrayList(4);
 137
 138                 fFilters.add(filter);
 139         }
 140
 141         /**
 142          * Sets an optional validator to check if the selection is valid. The
 143          * validator is invoked whenever the selection changes.
 144          *
 145          * @param validator
 146          *            the validator to validate the selection.
 147          */
 148         public void setValidator(ISelectionValidator validator) {
 149                 fValidator = validator;
 150         }
 151
 152         /**
 153          * Sets the tree input.
 154          *
 155          * @param input
 156          *            the tree input.
 157          */
 158         public void setInput(Object input) {
 159                 fInput = input;
 160         }
 161
 162         /**
 163          * Expands the tree
 164          */
 165         public void setExpandedElements(Object[] elements) {
 166                 fExpandedElements = elements;
 167         }
 168
 169         /**
 170          * Sets the size of the tree in unit of characters.
 171          *
 172          * @param width
 173          *            the width of the tree.
 174          * @param height
 175          *            the height of the tree.
 176          */
 177         public void setSize(int width, int height) {
 178                 fWidth = width;
 179                 fHeight = height;
 180         }
 181
 182         protected void updateOKStatus() {
 183                 if (!fIsEmpty) {
 184                         if (fValidator != null) {
 185                                 fCurrStatus = fValidator.validate(fViewer.getCheckedElements());
 186                                 updateStatus(fCurrStatus);
 187                         } else if (!fCurrStatus.isOK()) {
 188                                 fCurrStatus = new StatusInfo();
 189                         }
 190                 } else {
 191                         fCurrStatus = new StatusInfo(IStatus.ERROR, fEmptyListMessage);
 192                 }
 193                 updateStatus(fCurrStatus);
 194         }
 195
 196         /*
 197          * @see Window#open()
 198          */
 199         public int open() {
 200                 fIsEmpty = evaluateIfTreeEmpty(fInput);
 201                 BusyIndicator.showWhile(null, new Runnable() {
 202                         public void run() {
 203                                 access$superOpen();
 204                         }
 205                 });
 206
 207                 return getReturnCode();
 208         }
 209
 210         private void access$superOpen() {
 211                 super.open();
 212         }
 213
 214         /**
 215          * Handles cancel button pressed event.
 216          */
 217         protected void cancelPressed() {
 218                 setResult(null);
 219                 super.cancelPressed();
 220         }
 221
 222         /*
 223          * @see SelectionStatusDialog#computeResult()
 224          */
 225         protected void computeResult() {
 226                 setResult(Arrays.asList(fViewer.getCheckedElements()));
 227         }
 228
 229         /*
 230          * @see Window#create()
 231          */
 232         public void create() {
 233                 super.create();
 234
 235                 List initialSelections = getInitialElementSelections();
 236                 if (initialSelections != null) {
 237                         fViewer.setCheckedElements(initialSelections.toArray());
 238                 }
 239
 240                 if (fExpandedElements != null) {
 241                         fViewer.setExpandedElements(fExpandedElements);
 242                 }
 243
 244                 updateOKStatus();
 245         }
 246
 247         /*
 248          * @see Dialog#createDialogArea(Composite)
 249          */
 250         protected Control createDialogArea(Composite parent) {
 251                 Composite composite = (Composite) super.createDialogArea(parent);
 252
 253                 Label messageLabel = createMessageArea(composite);
 254                 Control treeWidget = createTreeViewer(composite);
 255                 Control buttonComposite = createSelectionButtons(composite);
 256
 257                 GridData data = new GridData(GridData.FILL_BOTH);
 258                 data.widthHint = convertWidthInCharsToPixels(fWidth);
 259                 data.heightHint = convertHeightInCharsToPixels(fHeight);
 260                 treeWidget.setLayoutData(data);
 261
 262                 if (fIsEmpty) {
 263                         messageLabel.setEnabled(false);
 264                         treeWidget.setEnabled(false);
 265                         buttonComposite.setEnabled(false);
 266                 }
 267
 268                 return composite;
 269         }
 270
 271         private Tree createTreeViewer(Composite parent) {
 272                 if (fContainerMode) {
 273                         fViewer = new ContainerCheckedTreeViewer(parent, SWT.BORDER);
 274                 } else {
 275                         fViewer = new CheckboxTreeViewer(parent, SWT.BORDER);
 276                 }
 277
 278                 fViewer.setContentProvider(fContentProvider);
 279                 fViewer.setLabelProvider(fLabelProvider);
 280                 fViewer.addCheckStateListener(new ICheckStateListener() {
 281                         public void checkStateChanged(CheckStateChangedEvent event) {
 282                                 updateOKStatus();
 283                         }
 284                 });
 285
 286                 fViewer.setSorter(fSorter);
 287                 if (fFilters != null) {
 288                         for (int i = 0; i != fFilters.size(); i++)
 289                                 fViewer.addFilter((ViewerFilter) fFilters.get(i));
 290                 }
 291
 292                 fViewer.setInput(fInput);
 293
 294                 return fViewer.getTree();
 295         }
 296
 297         /**
 298          * Add the selection and deselection buttons to the dialog.
 299          *
 300          * @param composite
 301          *            org.eclipse.swt.widgets.Composite
 302          */
 303         private Composite createSelectionButtons(Composite composite) {
 304
 305                 Composite buttonComposite = new Composite(composite, SWT.RIGHT);
 306                 GridLayout layout = new GridLayout();
 307                 layout.numColumns = 2;
 308                 buttonComposite.setLayout(layout);
 309                 GridData data = new GridData(GridData.HORIZONTAL_ALIGN_END
 310                                 | GridData.GRAB_HORIZONTAL);
 311                 data.grabExcessHorizontalSpace = true;
 312                 composite.setData(data);
 313
 314                 Button selectButton = createButton(buttonComposite,
 315                                 IDialogConstants.SELECT_ALL_ID, "Select &All", false);
 316
 317                 SelectionListener listener = new SelectionAdapter() {
 318                         public void widgetSelected(SelectionEvent e) {
 319                                 fViewer
 320                                                 .setCheckedElements(fContentProvider
 321                                                                 .getElements(fInput));
 322                                 updateOKStatus();
 323                         }
 324                 };
 325                 selectButton.addSelectionListener(listener);
 326
 327                 Button deselectButton = createButton(buttonComposite,
 328                                 IDialogConstants.DESELECT_ALL_ID, "&Deselect All", false);
 329
 330                 listener = new SelectionAdapter() {
 331                         public void widgetSelected(SelectionEvent e) {
 332                                 fViewer.setCheckedElements(new Object[0]);
 333                                 updateOKStatus();
 334                         }
 335                 };
 336                 deselectButton.addSelectionListener(listener);
 337                 return buttonComposite;
 338         }
 339
 340         private boolean evaluateIfTreeEmpty(Object input) {
 341                 Object[] elements = fContentProvider.getElements(input);
 342                 if (elements.length > 0) {
 343                         if (fFilters != null) {
 344                                 for (int i = 0; i < fFilters.size(); i++) {
 345                                         ViewerFilter curr = (ViewerFilter) fFilters.get(i);
 346                                         elements = curr.filter(fViewer, input, elements);
 347                                 }
 348                         }
 349                 }
 350                 return elements.length == 0;
 351         }
 352
 353 }