1 /*
2 * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javafx.scene.control.skin;
27
28 import com.sun.javafx.scene.control.skin.Utils;
29 import javafx.beans.property.ObjectProperty;
30 import javafx.collections.WeakListChangeListener;
31 import java.util.ArrayList;
32 import java.util.List;
33 import java.util.Map;
34 import java.util.WeakHashMap;
35 import java.util.concurrent.atomic.AtomicBoolean;
36
37 import javafx.collections.FXCollections;
38 import javafx.collections.ListChangeListener;
39 import javafx.collections.ObservableList;
40 import javafx.event.EventHandler;
41 import javafx.geometry.NodeOrientation;
42 import javafx.scene.Cursor;
43 import javafx.scene.Node;
44 import javafx.scene.control.*;
45 import javafx.scene.input.MouseEvent;
46 import javafx.scene.paint.Color;
47 import javafx.scene.shape.Rectangle;
48 import javafx.util.Callback;
49
50 /**
51 * <p>This class is used to construct the header of a TableView. We take the approach
52 * that every TableView header is nested - even if it isn't. This allows for us
53 * to use the same code for building a single row of TableColumns as we would
54 * with a heavily nested sequences of TableColumns. Because of this, the
55 * TableHeaderRow class consists of just one instance of a NestedTableColumnHeader.
56 *
57 * @since 9
58 * @see TableColumnHeader
59 * @see TableHeaderRow
60 * @see TableColumnBase
61 */
62 public class NestedTableColumnHeader extends TableColumnHeader {
63
64 /***************************************************************************
65 * *
66 * Static Fields *
67 * *
68 **************************************************************************/
69
70 private static final int DRAG_RECT_WIDTH = 4;
71
72 private static final String TABLE_COLUMN_KEY = "TableColumn";
73 private static final String TABLE_COLUMN_HEADER_KEY = "TableColumnHeader";
74
75
76
77 /***************************************************************************
78 * *
79 * Private Fields *
80 * *
81 **************************************************************************/
82
83 /**
84 * Represents the actual columns directly contained in this nested column.
85 * It does NOT include ANY of the children of these columns, if any exist.
86 */
87 private ObservableList<? extends TableColumnBase> columns;
88
89 private TableColumnHeader label;
90
91 private ObservableList<TableColumnHeader> columnHeaders;
92 private ObservableList<TableColumnHeader> unmodifiableColumnHeaders;
93
94 // used for column resizing
95 private double lastX = 0.0F;
96 private double dragAnchorX = 0.0;
97
98 // drag rectangle overlays
99 private Map<TableColumnBase<?,?>, Rectangle> dragRects = new WeakHashMap<>();
100
101 boolean updateColumns = true;
102
103
104
105 /***************************************************************************
106 * *
107 * Constructor *
108 * *
109 **************************************************************************/
110
111 /**
112 * Creates a new NestedTableColumnHeader instance to visually represent the given
113 * {@link TableColumnBase} instance.
114 *
115 * @param skin The skin used by the UI control.
116 * @param tc The table column to be visually represented by this instance.
117 */
118 public NestedTableColumnHeader(final TableViewSkinBase skin, final TableColumnBase tc) {
119 super(skin, tc);
120
121 getStyleClass().setAll("nested-column-header");
122 setFocusTraversable(false);
123
124 // init UI
125 label = new TableColumnHeader(skin, getTableColumn());
126 label.setTableHeaderRow(getTableHeaderRow());
127 label.setParentHeader(getParentHeader());
128 label.setNestedColumnHeader(this);
129
130 if (getTableColumn() != null) {
131 changeListenerHandler.registerChangeListener(getTableColumn().textProperty(), e ->
132 label.setVisible(getTableColumn().getText() != null && ! getTableColumn().getText().isEmpty()));
133 }
134
135 changeListenerHandler.registerChangeListener(TableSkinUtils.columnResizePolicyProperty(skin), e -> updateContent());
136 }
137
138
139
140 /***************************************************************************
141 * *
142 * Listeners *
143 * *
144 **************************************************************************/
145
146 private final ListChangeListener<TableColumnBase> columnsListener = c -> {
147 setHeadersNeedUpdate();
148 };
149
150 private final WeakListChangeListener weakColumnsListener =
151 new WeakListChangeListener(columnsListener);
152
153 private static final EventHandler<MouseEvent> rectMousePressed = me -> {
154 Rectangle rect = (Rectangle) me.getSource();
155 TableColumnBase column = (TableColumnBase) rect.getProperties().get(TABLE_COLUMN_KEY);
156 NestedTableColumnHeader header = (NestedTableColumnHeader) rect.getProperties().get(TABLE_COLUMN_HEADER_KEY);
157
158 if (! header.isColumnResizingEnabled()) return;
159
160 // column reordering takes precedence over column resizing, but sometimes the mouse dragged events
161 // can be received by both nodes, leading to less than ideal UX, hence the check here.
162 if (header.getTableHeaderRow().columnDragLock) return;
163
164 if (me.isConsumed()) return;
165 me.consume();
166
167 if (me.getClickCount() == 2 && me.isPrimaryButtonDown()) {
168 // the user wants to resize the column such that its
169 // width is equal to the widest element in the column
170 TableSkinUtils.resizeColumnToFitContent(header.getTableViewSkin(), column, -1);
171 } else {
172 // rather than refer to the rect variable, we just grab
173 // it from the source to prevent a small memory leak.
174 Rectangle innerRect = (Rectangle) me.getSource();
175 double startX = header.getTableHeaderRow().sceneToLocal(innerRect.localToScene(innerRect.getBoundsInLocal())).getMinX() + 2;
176 header.dragAnchorX = me.getSceneX();
177 header.columnResizingStarted(startX);
178 }
179 };
180
181 private static final EventHandler<MouseEvent> rectMouseDragged = me -> {
182 Rectangle rect = (Rectangle) me.getSource();
183 TableColumnBase column = (TableColumnBase) rect.getProperties().get(TABLE_COLUMN_KEY);
184 NestedTableColumnHeader header = (NestedTableColumnHeader) rect.getProperties().get(TABLE_COLUMN_HEADER_KEY);
185
186 if (! header.isColumnResizingEnabled()) return;
187
188 // column reordering takes precedence over column resizing, but sometimes the mouse dragged events
189 // can be received by both nodes, leading to less than ideal UX, hence the check here.
190 if (header.getTableHeaderRow().columnDragLock) return;
191
192 if (me.isConsumed()) return;
193 me.consume();
194
195 header.columnResizing(column, me);
196 };
197
198 private static final EventHandler<MouseEvent> rectMouseReleased = me -> {
199 Rectangle rect = (Rectangle) me.getSource();
200 TableColumnBase column = (TableColumnBase) rect.getProperties().get(TABLE_COLUMN_KEY);
201 NestedTableColumnHeader header = (NestedTableColumnHeader) rect.getProperties().get(TABLE_COLUMN_HEADER_KEY);
202
203 if (! header.isColumnResizingEnabled()) return;
204
205 // column reordering takes precedence over column resizing, but sometimes the mouse dragged events
206 // can be received by both nodes, leading to less than ideal UX, hence the check here.
207 if (header.getTableHeaderRow().columnDragLock) return;
208
209 if (me.isConsumed()) return;
210 me.consume();
211
212 header.columnResizingComplete(column, me);
213 };
214
215 private static final EventHandler<MouseEvent> rectCursorChangeListener = me -> {
216 Rectangle rect = (Rectangle) me.getSource();
217 TableColumnBase column = (TableColumnBase) rect.getProperties().get(TABLE_COLUMN_KEY);
218 NestedTableColumnHeader header = (NestedTableColumnHeader) rect.getProperties().get(TABLE_COLUMN_HEADER_KEY);
219
220 // column reordering takes precedence over column resizing, but sometimes the mouse dragged events
221 // can be received by both nodes, leading to less than ideal UX, hence the check here.
222 if (header.getTableHeaderRow().columnDragLock) return;
223
224 if (header.getCursor() == null) { // If there's a cursor for the whole header, don't override it
225 rect.setCursor(header.isColumnResizingEnabled() && rect.isHover() &&
226 column.isResizable() ? Cursor.H_RESIZE : null);
227 }
228 };
229
230
231
232 /***************************************************************************
233 * *
234 * Public Methods *
235 * *
236 **************************************************************************/
237
238 /** {@inheritDoc} */
239 @Override void dispose() {
240 super.dispose();
241
242 if (label != null) {
243 label.dispose();
244 }
245
246 if (getColumns() != null) {
247 getColumns().removeListener(weakColumnsListener);
248 }
249
250 for (int i = 0; i < getColumnHeaders().size(); i++) {
251 TableColumnHeader header = getColumnHeaders().get(i);
252 header.dispose();
253 }
254
255 for (Rectangle rect : dragRects.values()) {
256 if (rect != null) {
257 rect.visibleProperty().unbind();
258 }
259 }
260 dragRects.clear();
261 getChildren().clear();
262
263 changeListenerHandler.dispose();
264 }
265
266 /**
267 * Returns an unmodifiable list of the {@link TableColumnHeader} instances
268 * that are children of this NestedTableColumnHeader.
269 */
270 public final ObservableList<TableColumnHeader> getColumnHeaders() {
271 if (columnHeaders == null) {
272 columnHeaders = FXCollections.<TableColumnHeader>observableArrayList();
273 unmodifiableColumnHeaders = FXCollections.unmodifiableObservableList(columnHeaders);
274 }
275 return unmodifiableColumnHeaders;
276 }
277
278 /** {@inheritDoc} */
279 @Override protected void layoutChildren() {
280 double w = getWidth() - snappedLeftInset() - snappedRightInset();
281 double h = getHeight() - snappedTopInset() - snappedBottomInset();
282
283 int labelHeight = (int) label.prefHeight(-1);
284
285 if (label.isVisible()) {
286 // label gets to span whole width and sits at top
287 label.resize(w, labelHeight);
288 label.relocate(snappedLeftInset(), snappedTopInset());
289 }
290
291 // children columns need to share the total available width
292 double x = snappedLeftInset();
293 final double height = snapSizeY(h - labelHeight);
294 for (int i = 0, max = getColumnHeaders().size(); i < max; i++) {
295 TableColumnHeader n = getColumnHeaders().get(i);
296 if (! n.isVisible()) continue;
297
298 double prefWidth = n.prefWidth(height);
299
300 // position the column header in the default location...
301 n.resize(prefWidth, height);
302 n.relocate(x, labelHeight + snappedTopInset());
303
304 // // ...but, if there are no children of this column, we should ensure
305 // // that it is resized vertically such that it goes to the very
306 // // bottom of the table header row.
307 // if (getTableHeaderRow() != null && n.getCol().getColumns().isEmpty()) {
308 // Bounds bounds = getTableHeaderRow().sceneToLocal(n.localToScene(n.getBoundsInLocal()));
309 // prefHeight = getTableHeaderRow().getHeight() - bounds.getMinY();
310 // n.resize(prefWidth, prefHeight);
311 // }
312
313 // shuffle along the x-axis appropriately
314 x += prefWidth;
315
316 // position drag overlay to intercept column resize requests
317 Rectangle dragRect = dragRects.get(n.getTableColumn());
318 if (dragRect != null) {
319 dragRect.setHeight(n.getDragRectHeight());
320 dragRect.relocate(x - DRAG_RECT_WIDTH / 2, snappedTopInset() + labelHeight);
321 }
322 }
323 }
324
325 // sum up all children columns
326 /** {@inheritDoc} */
327 @Override protected double computePrefWidth(double height) {
328 checkState();
329
330 double width = 0.0F;
331
332 if (getColumns() != null) {
333 for (TableColumnHeader c : getColumnHeaders()) {
334 if (c.isVisible()) {
335 width += c.computePrefWidth(height);
336 }
337 }
338 }
339
340 return width;
341 }
342
343 /** {@inheritDoc} */
344 @Override protected double computePrefHeight(double width) {
345 checkState();
346
347 double height = 0.0F;
348
349 if (getColumnHeaders() != null) {
350 for (TableColumnHeader n : getColumnHeaders()) {
351 height = Math.max(height, n.prefHeight(-1));
352 }
353 }
354
355 return height + label.prefHeight(-1) + snappedTopInset() + snappedBottomInset();
356 }
357
358 /**
359 * Creates a new TableColumnHeader instance for the given TableColumnBase instance. By default this method should
360 * not be overridden, but in some circumstances it makes sense (e.g. testing, or when extreme customization is desired).
361 * If the given TableColumnBase instance has child columns, then it is suggested to return a
362 * {@link NestedTableColumnHeader} instance instead.
363 *
364 * @return A new TableColumnHeader instance.
365 */
366 protected TableColumnHeader createTableColumnHeader(TableColumnBase col) {
367 return col.getColumns().isEmpty() ?
368 new TableColumnHeader(getTableViewSkin(), col) :
369 new NestedTableColumnHeader(getTableViewSkin(), col);
370 }
371
372
373
374 /***************************************************************************
375 * *
376 * Private Implementation *
377 * *
378 **************************************************************************/
379
380 @Override void setTableHeaderRow(TableHeaderRow header) {
381 super.setTableHeaderRow(header);
382
383 label.setTableHeaderRow(header);
384
385 // tell all children columns what TableHeader they belong to
386 for (TableColumnHeader c : getColumnHeaders()) {
387 c.setTableHeaderRow(header);
388 }
389 }
390
391 @Override void setParentHeader(NestedTableColumnHeader parentHeader) {
392 super.setParentHeader(parentHeader);
393 label.setParentHeader(parentHeader);
394 }
395
396 ObservableList<? extends TableColumnBase> getColumns() {
397 return columns;
398 }
399
400 void setColumns(ObservableList<? extends TableColumnBase> newColumns) {
401 if (this.columns != null) {
402 this.columns.removeListener(weakColumnsListener);
403 }
404
405 this.columns = newColumns;
406
407 if (this.columns != null) {
408 this.columns.addListener(weakColumnsListener);
409 }
410 }
411
412 void updateTableColumnHeaders() {
413 // watching for changes to the view columns in either table or tableColumn.
414 if (getTableColumn() == null && getTableViewSkin() != null) {
415 setColumns(TableSkinUtils.getColumns(getTableViewSkin()));
416 } else if (getTableColumn() != null) {
417 setColumns(getTableColumn().getColumns());
418 }
419
420 // update the column headers...
421
422 // iterate through all columns, unless we've got no child columns
423 // any longer, in which case we should switch to a TableColumnHeader
424 // instead
425 if (getColumns().isEmpty()) {
426 // iterate through all current headers, telling them to clean up
427 for (int i = 0; i < getColumnHeaders().size(); i++) {
428 TableColumnHeader header = getColumnHeaders().get(i);
429 header.dispose();
430 }
431
432 // switch out to be a TableColumn instead, if we have a parent header
433 NestedTableColumnHeader parentHeader = getParentHeader();
434 if (parentHeader != null) {
435 List<TableColumnHeader> parentColumnHeaders = parentHeader.getColumnHeaders();
436 int index = parentColumnHeaders.indexOf(this);
437 if (index >= 0 && index < parentColumnHeaders.size()) {
438 parentColumnHeaders.set(index, createColumnHeader(getTableColumn()));
439 }
440 } else {
441 // otherwise just remove all the columns
442 columnHeaders.clear();
443 }
444 } else {
445 List<TableColumnHeader> oldHeaders = new ArrayList<>(getColumnHeaders());
446 List<TableColumnHeader> newHeaders = new ArrayList<>();
447
448 for (int i = 0; i < getColumns().size(); i++) {
449 TableColumnBase<?,?> column = getColumns().get(i);
450 if (column == null || ! column.isVisible()) continue;
451
452 // check if the header already exists and reuse it
453 boolean found = false;
454 for (int j = 0; j < oldHeaders.size(); j++) {
455 TableColumnHeader oldColumn = oldHeaders.get(j);
456 if (oldColumn.represents(column)) {
457 newHeaders.add(oldColumn);
458 found = true;
459 break;
460 }
461 }
462
463 // otherwise create a new table column header
464 if (!found) {
465 newHeaders.add(createColumnHeader(column));
466 }
467 }
468
469 columnHeaders.setAll(newHeaders);
470
471 // dispose all old headers
472 oldHeaders.removeAll(newHeaders);
473 for (int i = 0; i < oldHeaders.size(); i++) {
474 oldHeaders.get(i).dispose();
475 }
476 }
477
478 // update the content
479 updateContent();
480
481 // RT-33596: Do CSS now, as we are in the middle of layout pass and the headers are new Nodes w/o CSS done
482 for (TableColumnHeader header : getColumnHeaders()) {
483 header.applyCss();
484 }
485 }
486
487 // Used to test whether this column header properly represents the given column.
488 // In particular, whether it has child column headers for all child columns
489 boolean represents(TableColumnBase<?, ?> column) {
490 if (column.getColumns().isEmpty()) {
491 // this column has no children, but we are in a NestedTableColumnHeader instance,
492 // so the match is bad.
493 return false;
494 }
495
496 if (column != getTableColumn()) {
497 return false;
498 }
499
500 final int columnCount = column.getColumns().size();
501 final int headerCount = getColumnHeaders().size();
502 if (columnCount != headerCount) {
503 return false;
504 }
505
506 for (int i = 0; i < columnCount; i++) {
507 // we expect the order of all children to match the order of the headers
508 TableColumnBase<?,?> childColumn = column.getColumns().get(i);
509 TableColumnHeader childHeader = getColumnHeaders().get(i);
510 if (!childHeader.represents(childColumn)) {
511 return false;
512 }
513 }
514 return true;
515 }
516
517 /** {@inheritDoc} */
518 @Override double getDragRectHeight() {
519 return label.prefHeight(-1);
520 }
521
522 void setHeadersNeedUpdate() {
523 updateColumns = true;
524
525 // go through children columns - they should update too
526 for (int i = 0; i < getColumnHeaders().size(); i++) {
527 TableColumnHeader header = getColumnHeaders().get(i);
528 if (header instanceof NestedTableColumnHeader) {
529 ((NestedTableColumnHeader)header).setHeadersNeedUpdate();
530 }
531 }
532 requestLayout();
533 }
534
535 private void updateContent() {
536 // create a temporary list so we only do addAll into the main content
537 // observableArrayList once.
538 final List<Node> content = new ArrayList<Node>();
539
540 // the label is the region that sits above the children columns
541 content.add(label);
542
543 // all children columns
544 content.addAll(getColumnHeaders());
545
546 // Small transparent overlays that sit at the start and end of each
547 // column to intercept user drag gestures to enable column resizing.
548 if (isColumnResizingEnabled()) {
549 rebuildDragRects();
550 content.addAll(dragRects.values());
551 }
552
553 getChildren().setAll(content);
554 }
555
556 private void rebuildDragRects() {
557 if (! isColumnResizingEnabled()) return;
558
559 getChildren().removeAll(dragRects.values());
560
561 for (Rectangle rect : dragRects.values()) {
562 rect.visibleProperty().unbind();
563 }
564 dragRects.clear();
565
566 List<? extends TableColumnBase> columns = getColumns();
567
568 if (columns == null) {
569 return;
570 }
571
572 final TableViewSkinBase<?,?,?,?,?> skin = getTableViewSkin();
573
574 boolean isConstrainedResize = false;
575 Callback<ResizeFeaturesBase,Boolean> columnResizePolicy = TableSkinUtils.columnResizePolicyProperty(skin).get();
576 if (columnResizePolicy != null) {
577 isConstrainedResize =
578 skin instanceof TableViewSkin ? TableView.CONSTRAINED_RESIZE_POLICY.equals(columnResizePolicy) :
579 skin instanceof TreeTableViewSkin ? TreeTableView.CONSTRAINED_RESIZE_POLICY.equals(columnResizePolicy) :
580 false;
581 }
582
583 // RT-32547 - don't show resize cursor when in constrained resize mode
584 // and there is only one column
585 if (isConstrainedResize && TableSkinUtils.getVisibleLeafColumns(skin).size() == 1) {
586 return;
587 }
588
589 for (int col = 0; col < columns.size(); col++) {
590 if (isConstrainedResize && col == getColumns().size() - 1) {
591 break;
592 }
593
594 final TableColumnBase c = columns.get(col);
595 final Rectangle rect = new Rectangle();
596 rect.getProperties().put(TABLE_COLUMN_KEY, c);
597 rect.getProperties().put(TABLE_COLUMN_HEADER_KEY, this);
598 rect.setWidth(DRAG_RECT_WIDTH);
599 rect.setHeight(getHeight() - label.getHeight());
600 rect.setFill(Color.TRANSPARENT);
601 rect.visibleProperty().bind(c.visibleProperty().and(c.resizableProperty()));
602 rect.setOnMousePressed(rectMousePressed);
603 rect.setOnMouseDragged(rectMouseDragged);
604 rect.setOnMouseReleased(rectMouseReleased);
605 rect.setOnMouseEntered(rectCursorChangeListener);
606 rect.setOnMouseExited(rectCursorChangeListener);
607
608 dragRects.put(c, rect);
609 }
610 }
611
612 private void checkState() {
613 if (updateColumns) {
614 updateTableColumnHeaders();
615 updateColumns = false;
616 }
617 }
618
619 private TableColumnHeader createColumnHeader(TableColumnBase col) {
620 TableColumnHeader newCol = createTableColumnHeader(col);
621 newCol.setTableHeaderRow(getTableHeaderRow());
622 newCol.setParentHeader(this);
623 return newCol;
624 }
625
626
627
628 /***************************************************************************
629 * *
630 * Private Implementation: Column Resizing *
631 * *
632 **************************************************************************/
633
634 private boolean isColumnResizingEnabled() {
635 // this used to check if ! PlatformUtil.isEmbedded(), but has been changed
636 // to always return true (for now), as we want to support column resizing
637 // everywhere
638 return true;
639 }
640
641 private void columnResizingStarted(double startX) {
642 setCursor(Cursor.H_RESIZE);
643 columnReorderLine.setLayoutX(startX);
644 }
645
646 private void columnResizing(TableColumnBase col, MouseEvent me) {
647 double draggedX = me.getSceneX() - dragAnchorX;
648 if (getEffectiveNodeOrientation() == NodeOrientation.RIGHT_TO_LEFT) {
649 draggedX = -draggedX;
650 }
651 double delta = draggedX - lastX;
652 boolean allowed = TableSkinUtils.resizeColumn(getTableViewSkin(), col, delta);
653 if (allowed) {
654 lastX = draggedX;
655 }
656 }
657
658 private void columnResizingComplete(TableColumnBase col, MouseEvent me) {
659 setCursor(null);
660 columnReorderLine.setTranslateX(0.0F);
661 columnReorderLine.setLayoutX(0.0F);
662 lastX = 0.0F;
663 }
664 }