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a3b510ab NR |
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 | } |