| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to you under the Apache License, |
| * Version 2.0 (the "License"); you may not use this file except in |
| * compliance with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.pivot.wtk; |
| |
| import org.apache.pivot.collections.Sequence; |
| import org.apache.pivot.util.ListenerList; |
| import org.apache.pivot.util.Vote; |
| |
| /** |
| * Container that behaves like a deck of cards, only one of which may be visible |
| * at a time. |
| */ |
| public class CardPane extends Container { |
| private static class CardPaneListenerList extends WTKListenerList<CardPaneListener> implements |
| CardPaneListener { |
| @Override |
| public Vote previewSelectedIndexChange(CardPane cardPane, int selectedIndex) { |
| Vote vote = Vote.APPROVE; |
| |
| for (CardPaneListener listener : this) { |
| vote = vote.tally(listener.previewSelectedIndexChange(cardPane, selectedIndex)); |
| } |
| |
| return vote; |
| } |
| |
| @Override |
| public void selectedIndexChangeVetoed(CardPane cardPane, Vote reason) { |
| for (CardPaneListener listener : this) { |
| listener.selectedIndexChangeVetoed(cardPane, reason); |
| } |
| } |
| |
| @Override |
| public void selectedIndexChanged(CardPane cardPane, int previousSelectedIndex) { |
| for (CardPaneListener listener : this) { |
| listener.selectedIndexChanged(cardPane, previousSelectedIndex); |
| } |
| } |
| } |
| |
| private int selectedIndex = -1; |
| private CardPaneListenerList cardPaneListeners = new CardPaneListenerList(); |
| |
| public CardPane() { |
| installSkin(CardPane.class); |
| } |
| |
| /** |
| * Returns the currently selected card index. |
| * |
| * @return The selected card index, or <tt>-1</tt> if no card is selected. |
| */ |
| public int getSelectedIndex() { |
| return selectedIndex; |
| } |
| |
| /** |
| * Sets the selected card index. |
| * |
| * @param selectedIndex The selected card index, or <tt>-1</tt> for no |
| * selection. |
| */ |
| public void setSelectedIndex(int selectedIndex) { |
| indexBoundsCheck("selectedIndex", selectedIndex, -1, getLength() - 1); |
| |
| int previousSelectedIndex = this.selectedIndex; |
| |
| if (previousSelectedIndex != selectedIndex) { |
| Vote vote = cardPaneListeners.previewSelectedIndexChange(this, selectedIndex); |
| |
| if (vote == Vote.APPROVE) { |
| this.selectedIndex = selectedIndex; |
| cardPaneListeners.selectedIndexChanged(this, previousSelectedIndex); |
| } else { |
| cardPaneListeners.selectedIndexChangeVetoed(this, vote); |
| } |
| } |
| } |
| |
| public Component getSelectedCard() { |
| return (selectedIndex == -1) ? null : get(selectedIndex); |
| } |
| |
| @Override |
| public void insert(Component component, int index) { |
| // Update the selection |
| int previousSelectedIndex = selectedIndex; |
| |
| if (selectedIndex >= index) { |
| selectedIndex++; |
| } |
| |
| // Insert the component |
| super.insert(component, index); |
| |
| // Fire selection change event, if necessary |
| if (selectedIndex != previousSelectedIndex && previousSelectedIndex > -1) { |
| cardPaneListeners.selectedIndexChanged(this, selectedIndex); |
| } |
| } |
| |
| @Override |
| public Sequence<Component> remove(int index, int count) { |
| // Update the selection |
| int previousSelectedIndex = selectedIndex; |
| |
| if (selectedIndex >= index) { |
| if (selectedIndex < index + count) { |
| selectedIndex = -1; |
| } else { |
| selectedIndex -= count; |
| } |
| } |
| |
| // Remove the components |
| Sequence<Component> removed = super.remove(index, count); |
| |
| // Fire selection change event, if necessary |
| if (selectedIndex != previousSelectedIndex && previousSelectedIndex > -1) { |
| cardPaneListeners.selectedIndexChanged(this, selectedIndex); |
| } |
| |
| return removed; |
| } |
| |
| public ListenerList<CardPaneListener> getCardPaneListeners() { |
| return cardPaneListeners; |
| } |
| } |