1 /*
2 * Copyright (c) 2010, 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;
27
28 import javafx.beans.property.ObjectProperty;
29 import javafx.collections.ListChangeListener;
30 import javafx.collections.ObservableList;
31
32 import com.sun.javafx.collections.TrackableObservableList;
33 import javafx.geometry.Orientation;
34 import javafx.scene.Node;
35 import javafx.scene.control.skin.AccordionSkin;
36
37 import javafx.beans.property.ObjectPropertyBase;
38 import javafx.beans.value.WritableValue;
39 import javafx.css.StyleableProperty;
40
41 import java.util.List;
42
43 /**
44 * <p>An accordion is a group of {@link TitledPane TitlePanes}. Only one TitledPane can be opened at
45 * a time.</p>
46 *
47 * <p>The {@link TitledPane} content in an accordion can be any {@link javafx.scene.Node} such as UI controls or groups
48 * of nodes added to a layout container.</p>
49 *
50 * <p>It is not recommended to set the MinHeight, PrefHeight, or MaxHeight
51 * for this control. Unexpected behavior will occur because the
52 * Accordion's height changes when a TitledPane is opened or closed.</p>
53 *
54 * <p>
55 * Accordion sets focusTraversable to false.
56 * </p>
57 *
58 * <p>Example:
59 * <pre><code>
60 * TitledPane t1 = new TitledPane("T1", new Button("B1"));
61 * TitledPane t2 = new TitledPane("T2", new Button("B2"));
62 * TitledPane t3 = new TitledPane("T3", new Button("B3"));
63 * Accordion accordion = new Accordion();
64 * accordion.getPanes().addAll(t1, t2, t3);</code></pre>
65 * @since JavaFX 2.0
66 */
67 public class Accordion extends Control {
68 private boolean biasDirty = true;
69 private Orientation bias;
70
71 /***************************************************************************
72 * *
73 * Constructors *
74 * *
75 **************************************************************************/
76
77 /**
78 * Creates a new Accordion with no TitledPanes.
79 */
80 public Accordion() {
81 this((TitledPane[])null);
82 }
83
84 /**
85 * Creates a new Accordion with the given TitledPanes showing within it.
86 *
87 * @param titledPanes The TitledPanes to show inside the Accordion.
88 * @since JavaFX 8u40
89 */
90 public Accordion(TitledPane... titledPanes) {
91 getStyleClass().setAll(DEFAULT_STYLE_CLASS);
92
93 if (titledPanes != null) {
94 getPanes().addAll(titledPanes);
95 }
96
97 // focusTraversable is styleable through css. Calling setFocusTraversable
98 // makes it look to css like the user set the value and css will not
99 // override. Initializing focusTraversable by calling applyStyle with null
100 // StyleOrigin ensures that css will be able to override the value.
101 ((StyleableProperty<Boolean>)(WritableValue<Boolean>)focusTraversableProperty()).applyStyle(null, Boolean.FALSE);
102 }
103
104 /***************************************************************************
105 * *
106 * Instance Variables *
107 * *
108 **************************************************************************/
109
110 // The ObservableList of TitlePanes to use in this Accordion.
111 private final ObservableList<TitledPane> panes = new TrackableObservableList<TitledPane>() {
112 @Override protected void onChanged(ListChangeListener.Change<TitledPane> c) {
113 // If one of the removed panes was the expandedPane, then clear
114 // the expandedPane property. This can only be done if expandedPane
115 // is not bound (if it is bound, we just have to accept the
116 // potential error condition and allow the skin to handle it).
117 while (c.next()) {
118 if (c.wasRemoved() && !expandedPane.isBound()) {
119 for (TitledPane pane : c.getRemoved()) {
120 if (!c.getAddedSubList().contains(pane) && getExpandedPane() == pane) {
121 setExpandedPane(null);
122 break; // There can be only one, so no point continuing iteration
123 }
124 }
125 }
126 }
127 }
128 };
129
130 /***************************************************************************
131 * *
132 * Properties *
133 * *
134 **************************************************************************/
135
136 // --- Expanded Pane
137 private ObjectProperty<TitledPane> expandedPane = new ObjectPropertyBase<TitledPane>() {
138
139 private TitledPane oldValue;
140
141 @Override
142 protected void invalidated() {
143 final TitledPane value = get();
144 if (value != null) {
145 value.setExpanded(true);
146 } else {
147 if (oldValue != null) {
148 oldValue.setExpanded(false);
149 }
150 }
151 oldValue = value;
152 }
153
154 @Override
155 public String getName() {
156 return "expandedPane";
157 }
158
159 @Override
160 public Object getBean() {
161 return Accordion.this;
162 }
163
164 };
165
166 /**
167 * <p>The expanded {@link TitledPane} that is currently visible. While it is technically
168 * possible to set the expanded pane to a value that is not in {@link #getPanes},
169 * doing so will be treated by the skin as if expandedPane is null. If a pane
170 * is set as the expanded pane, and is subsequently removed from {@link #getPanes},
171 * then expanded pane will be set to null, if possible. (This will not be possible
172 * if you have manually bound the expanded pane to some value, for example).
173 * </p>
174 * @param value the expanded {@link TitledPane}
175 */
176 public final void setExpandedPane(TitledPane value) { expandedPaneProperty().set(value); }
177
178 /**
179 * Gets the expanded TitledPane in the Accordion. If the expanded pane has been
180 * removed or there is no expanded TitledPane {@code null} is returned.
181 *
182 * @return The expanded TitledPane in the Accordion.
183 */
184 public final TitledPane getExpandedPane() { return expandedPane.get(); }
185
186 /**
187 * The expanded TitledPane in the Accordion.
188 *
189 * @return The expanded TitledPane in the Accordion.
190 */
191 public final ObjectProperty<TitledPane> expandedPaneProperty() { return expandedPane; }
192
193 /***************************************************************************
194 * *
195 * Public API *
196 * *
197 **************************************************************************/
198
199 /**
200 * Gets the list of {@link TitledPane} in this Accordion. Changing this ObservableList
201 * will immediately result in the Accordion updating to display
202 * the new contents of this ObservableList.
203 *
204 * @return The list of TitledPane in this Accordion.
205 */
206 public final ObservableList<TitledPane> getPanes() { return panes; }
207
208 /** {@inheritDoc} */
209 @Override protected Skin<?> createDefaultSkin() {
210 return new AccordionSkin(this);
211 }
212
213 /** {@inheritDoc} */
214 @Override public void requestLayout() {
215 biasDirty = true;
216 bias = null;
217 super.requestLayout();
218 }
219
220 /** {@inheritDoc} */
221 @Override public Orientation getContentBias() {
222 if (biasDirty) {
223 bias = null;
224 final List<Node> children = getManagedChildren();
225 for (Node child : children) {
226 Orientation contentBias = child.getContentBias();
227 if (contentBias != null) {
228 bias = contentBias;
229 if (contentBias == Orientation.HORIZONTAL) {
230 break;
231 }
232 }
233 }
234 biasDirty = false;
235 }
236 return bias;
237 }
238
239 /***************************************************************************
240 * *
241 * Stylesheet Handling *
242 * *
243 **************************************************************************/
244
245 private static final String DEFAULT_STYLE_CLASS = "accordion";
246
247 /**
248 * Returns the initial focus traversable state of this control, for use
249 * by the JavaFX CSS engine to correctly set its initial value. This method
250 * is overridden as by default UI controls have focus traversable set to true,
251 * but that is not appropriate for this control.
252 *
253 * @since 9
254 */
255 @Override protected Boolean getInitialFocusTraversable() {
256 return Boolean.FALSE;
257 }
258
259 }