| 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.terminal.swing; |
| 20 | |
| 21 | import com.googlecode.lanterna.TerminalTextUtils; |
| 22 | import com.googlecode.lanterna.TextCharacter; |
| 23 | import com.googlecode.lanterna.TerminalPosition; |
| 24 | import com.googlecode.lanterna.TerminalSize; |
| 25 | import java.util.ArrayList; |
| 26 | import java.util.Iterator; |
| 27 | import java.util.LinkedList; |
| 28 | import java.util.List; |
| 29 | import java.util.ListIterator; |
| 30 | |
| 31 | /** |
| 32 | * Contains an entire text buffer used by Swing terminal |
| 33 | * @author martin |
| 34 | */ |
| 35 | class TextBuffer { |
| 36 | private final int backlog; |
| 37 | private final LinkedList<List<TextCharacter>> lineBuffer; |
| 38 | private final TextCharacter fillCharacter; |
| 39 | |
| 40 | TextBuffer(int backlog) { |
| 41 | this.backlog = backlog; |
| 42 | this.lineBuffer = new LinkedList<List<TextCharacter>>(); |
| 43 | this.fillCharacter = TextCharacter.DEFAULT_CHARACTER; |
| 44 | |
| 45 | //Initialize the content to one line |
| 46 | newLine(); |
| 47 | } |
| 48 | |
| 49 | void clear() { |
| 50 | lineBuffer.clear(); |
| 51 | newLine(); |
| 52 | } |
| 53 | |
| 54 | void newLine() { |
| 55 | ArrayList<TextCharacter> line = new ArrayList<TextCharacter>(200); |
| 56 | line.add(fillCharacter); |
| 57 | lineBuffer.addFirst(line); |
| 58 | } |
| 59 | |
| 60 | |
| 61 | Iterable<List<TextCharacter>> getVisibleLines(final int visibleRows, final int scrollOffset) { |
| 62 | final int length = Math.min(visibleRows, lineBuffer.size()); |
| 63 | return new Iterable<List<TextCharacter>>() { |
| 64 | @Override |
| 65 | public Iterator<List<TextCharacter>> iterator() { |
| 66 | return new Iterator<List<TextCharacter>>() { |
| 67 | private final ListIterator<List<TextCharacter>> listIterator = lineBuffer.subList(scrollOffset, scrollOffset + length).listIterator(length); |
| 68 | @Override |
| 69 | public boolean hasNext() { return listIterator.hasPrevious(); } |
| 70 | @Override |
| 71 | public List<TextCharacter> next() { return listIterator.previous(); } |
| 72 | @Override |
| 73 | public void remove() { listIterator.remove(); } |
| 74 | }; |
| 75 | } |
| 76 | }; |
| 77 | } |
| 78 | |
| 79 | int getNumberOfLines() { |
| 80 | return lineBuffer.size(); |
| 81 | } |
| 82 | |
| 83 | void trimBacklog(int terminalHeight) { |
| 84 | while(lineBuffer.size() - terminalHeight > backlog) { |
| 85 | lineBuffer.removeLast(); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | void ensurePosition(TerminalSize terminalSize, TerminalPosition position) { |
| 90 | getLine(terminalSize, position); |
| 91 | } |
| 92 | |
| 93 | public TextCharacter getCharacter(TerminalSize terminalSize, TerminalPosition position) { |
| 94 | return getLine(terminalSize, position).get(position.getColumn()); |
| 95 | } |
| 96 | |
| 97 | void setCharacter(TerminalSize terminalSize, TerminalPosition currentPosition, TextCharacter terminalCharacter) { |
| 98 | List<TextCharacter> line = getLine(terminalSize, currentPosition); |
| 99 | |
| 100 | //If we are replacing a CJK character with a non-CJK character, make the following character empty |
| 101 | if(TerminalTextUtils.isCharCJK(line.get(currentPosition.getColumn()).getCharacter()) && |
| 102 | !TerminalTextUtils.isCharCJK(terminalCharacter.getCharacter())) { |
| 103 | line.set(currentPosition.getColumn() + 1, terminalCharacter.withCharacter(' ')); |
| 104 | } |
| 105 | |
| 106 | //Set the character in the buffer |
| 107 | line.set(currentPosition.getColumn(), terminalCharacter); |
| 108 | |
| 109 | //Pad CJK character with a trailing space |
| 110 | if(TerminalTextUtils.isCharCJK(terminalCharacter.getCharacter()) && currentPosition.getColumn() + 1 < line.size()) { |
| 111 | ensurePosition(terminalSize, currentPosition.withRelativeColumn(1)); |
| 112 | line.set(currentPosition.getColumn() + 1, terminalCharacter.withCharacter(' ')); |
| 113 | } |
| 114 | //If there's a CJK character immediately to our left, reset it |
| 115 | if(currentPosition.getColumn() > 0 && TerminalTextUtils.isCharCJK(line.get(currentPosition.getColumn() - 1).getCharacter())) { |
| 116 | line.set(currentPosition.getColumn() - 1, line.get(currentPosition.getColumn() - 1).withCharacter(' ')); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | private List<TextCharacter> getLine(TerminalSize terminalSize, TerminalPosition position) { |
| 121 | while(position.getRow() >= lineBuffer.size()) { |
| 122 | newLine(); |
| 123 | } |
| 124 | int lineIndex = Math.min(terminalSize.getRows(), lineBuffer.size()) - 1 - position.getRow(); |
| 125 | List<TextCharacter> line = lineBuffer.get(lineIndex); |
| 126 | while(line.size() <= position.getColumn()) { |
| 127 | line.add(fillCharacter); |
| 128 | } |
| 129 | return line; |
| 130 | } |
| 131 | } |