| 1 | /* |
| 2 | * This file is part of lanterna (http://code.google.com/p/lanterna/). |
| 3 | * |
| 4 | * lanterna is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU Lesser General Public License as published by |
| 6 | * the Free Software Foundation, either version 3 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | * |
| 17 | * Copyright (C) 2010-2015 Martin |
| 18 | */ |
| 19 | package com.googlecode.lanterna.gui2; |
| 20 | |
| 21 | import com.googlecode.lanterna.TerminalPosition; |
| 22 | import com.googlecode.lanterna.input.KeyStroke; |
| 23 | |
| 24 | import java.util.Collection; |
| 25 | import java.util.Collections; |
| 26 | |
| 27 | /** |
| 28 | * This abstract implementation contains common code for the different {@code Composite} implementations. A |
| 29 | * {@code Composite} component is one that encapsulates a single component, like borders. Because of this, a |
| 30 | * {@code Composite} can be seen as a special case of a {@code Container} and indeed this abstract class does in fact |
| 31 | * implement the {@code Container} interface as well, to make the composites easier to work with internally. |
| 32 | * @author martin |
| 33 | * @param <T> Should always be itself, see {@code AbstractComponent} |
| 34 | */ |
| 35 | public abstract class AbstractComposite<T extends Container> extends AbstractComponent<T> implements Composite, Container { |
| 36 | |
| 37 | private Component component; |
| 38 | |
| 39 | /** |
| 40 | * Default constructor |
| 41 | */ |
| 42 | public AbstractComposite() { |
| 43 | component = null; |
| 44 | } |
| 45 | |
| 46 | @Override |
| 47 | public void setComponent(Component component) { |
| 48 | Component oldComponent = this.component; |
| 49 | if(oldComponent == component) { |
| 50 | return; |
| 51 | } |
| 52 | if(oldComponent != null) { |
| 53 | removeComponent(oldComponent); |
| 54 | } |
| 55 | if(component != null) { |
| 56 | this.component = component; |
| 57 | component.onAdded(this); |
| 58 | component.setPosition(TerminalPosition.TOP_LEFT_CORNER); |
| 59 | invalidate(); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | @Override |
| 64 | public Component getComponent() { |
| 65 | return component; |
| 66 | } |
| 67 | |
| 68 | @Override |
| 69 | public int getChildCount() { |
| 70 | return component != null ? 1 : 0; |
| 71 | } |
| 72 | |
| 73 | @Override |
| 74 | public Collection<Component> getChildren() { |
| 75 | if(component != null) { |
| 76 | return Collections.singletonList(component); |
| 77 | } |
| 78 | else { |
| 79 | return Collections.emptyList(); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | @Override |
| 84 | public boolean containsComponent(Component component) { |
| 85 | return component != null && component.hasParent(this); |
| 86 | } |
| 87 | |
| 88 | @Override |
| 89 | public boolean removeComponent(Component component) { |
| 90 | if(this.component == component) { |
| 91 | this.component = null; |
| 92 | component.onRemoved(this); |
| 93 | invalidate(); |
| 94 | return true; |
| 95 | } |
| 96 | return false; |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public boolean isInvalid() { |
| 101 | return component != null && component.isInvalid(); |
| 102 | } |
| 103 | |
| 104 | @Override |
| 105 | public void invalidate() { |
| 106 | super.invalidate(); |
| 107 | |
| 108 | //Propagate |
| 109 | if(component != null) { |
| 110 | component.invalidate(); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | @Override |
| 115 | public Interactable nextFocus(Interactable fromThis) { |
| 116 | if(fromThis == null && getComponent() instanceof Interactable) { |
| 117 | return (Interactable)getComponent(); |
| 118 | } |
| 119 | else if(getComponent() instanceof Container) { |
| 120 | return ((Container)getComponent()).nextFocus(fromThis); |
| 121 | } |
| 122 | return null; |
| 123 | } |
| 124 | |
| 125 | @Override |
| 126 | public Interactable previousFocus(Interactable fromThis) { |
| 127 | if(fromThis == null && getComponent() instanceof Interactable) { |
| 128 | return (Interactable)getComponent(); |
| 129 | } |
| 130 | else if(getComponent() instanceof Container) { |
| 131 | return ((Container)getComponent()).previousFocus(fromThis); |
| 132 | } |
| 133 | return null; |
| 134 | } |
| 135 | |
| 136 | @Override |
| 137 | public boolean handleInput(KeyStroke key) { |
| 138 | return false; |
| 139 | } |
| 140 | |
| 141 | @Override |
| 142 | public void updateLookupMap(InteractableLookupMap interactableLookupMap) { |
| 143 | if(getComponent() instanceof Container) { |
| 144 | ((Container)getComponent()).updateLookupMap(interactableLookupMap); |
| 145 | } |
| 146 | else if(getComponent() instanceof Interactable) { |
| 147 | interactableLookupMap.add((Interactable)getComponent()); |
| 148 | } |
| 149 | } |
| 150 | } |