1 | /* |
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2 | Copyright (C) 2007 by Robert Knight <robertknight@gmail.com> |
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3 | |
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4 | Rewritten for QT4 by e_k <e_k at users.sourceforge.net>, Copyright (C)2008 |
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5 | |
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6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2 of the License, or |
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9 | (at your option) any later version. |
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10 | |
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11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software |
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18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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19 | 02110-1301 USA. |
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20 | */ |
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21 | |
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22 | // Own |
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23 | #include "ScreenWindow.h" |
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24 | |
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25 | // Qt |
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26 | #include <QtCore> |
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27 | |
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28 | // Konsole |
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29 | #include "Screen.h" |
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30 | |
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31 | |
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32 | using namespace Konsole; |
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33 | |
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34 | ScreenWindow::ScreenWindow(QObject* parent) |
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35 | : QObject(parent) |
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36 | , _windowBuffer(0) |
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37 | , _windowBufferSize(0) |
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38 | , _bufferNeedsUpdate(true) |
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39 | , _windowLines(1) |
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40 | , _currentLine(0) |
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41 | , _trackOutput(true) |
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42 | , _scrollCount(0) |
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43 | { |
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44 | } |
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45 | ScreenWindow::~ScreenWindow() |
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46 | { |
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47 | delete[] _windowBuffer; |
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48 | } |
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49 | void ScreenWindow::setScreen(Screen* screen) |
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50 | { |
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51 | Q_ASSERT( screen ); |
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52 | |
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53 | _screen = screen; |
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54 | } |
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55 | |
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56 | Screen* ScreenWindow::screen() const |
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57 | { |
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58 | return _screen; |
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59 | } |
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60 | |
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61 | Character* ScreenWindow::getImage() |
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62 | { |
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63 | // reallocate internal buffer if the window size has changed |
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64 | int size = windowLines() * windowColumns(); |
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65 | if (_windowBuffer == 0 || _windowBufferSize != size) |
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66 | { |
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67 | delete[] _windowBuffer; |
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68 | _windowBufferSize = size; |
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69 | _windowBuffer = new Character[size]; |
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70 | _bufferNeedsUpdate = true; |
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71 | } |
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72 | |
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73 | if (!_bufferNeedsUpdate) |
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74 | return _windowBuffer; |
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75 | |
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76 | _screen->getImage(_windowBuffer,size, |
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77 | currentLine(),endWindowLine()); |
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78 | |
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79 | // this window may look beyond the end of the screen, in which |
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80 | // case there will be an unused area which needs to be filled |
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81 | // with blank characters |
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82 | fillUnusedArea(); |
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83 | |
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84 | _bufferNeedsUpdate = false; |
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85 | return _windowBuffer; |
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86 | } |
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87 | |
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88 | void ScreenWindow::fillUnusedArea() |
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89 | { |
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90 | int screenEndLine = _screen->getHistLines() + _screen->getLines() - 1; |
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91 | int windowEndLine = currentLine() + windowLines() - 1; |
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92 | |
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93 | int unusedLines = windowEndLine - screenEndLine; |
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94 | int charsToFill = unusedLines * windowColumns(); |
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95 | |
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96 | Screen::fillWithDefaultChar(_windowBuffer + _windowBufferSize - charsToFill,charsToFill); |
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97 | } |
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98 | |
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99 | // return the index of the line at the end of this window, or if this window |
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100 | // goes beyond the end of the screen, the index of the line at the end |
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101 | // of the screen. |
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102 | // |
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103 | // when passing a line number to a Screen method, the line number should |
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104 | // never be more than endWindowLine() |
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105 | // |
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106 | int ScreenWindow::endWindowLine() const |
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107 | { |
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108 | return qMin(currentLine() + windowLines() - 1, |
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109 | lineCount() - 1); |
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110 | } |
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111 | QVector<LineProperty> ScreenWindow::getLineProperties() |
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112 | { |
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113 | QVector<LineProperty> result = _screen->getLineProperties(currentLine(),endWindowLine()); |
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114 | |
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115 | if (result.count() != windowLines()) |
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116 | result.resize(windowLines()); |
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117 | |
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118 | return result; |
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119 | } |
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120 | |
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121 | QString ScreenWindow::selectedText( bool preserveLineBreaks ) const |
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122 | { |
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123 | return _screen->selectedText( preserveLineBreaks ); |
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124 | } |
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125 | |
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126 | void ScreenWindow::getSelectionStart( int& column , int& line ) |
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127 | { |
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128 | _screen->getSelectionStart(column,line); |
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129 | line -= currentLine(); |
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130 | } |
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131 | void ScreenWindow::getSelectionEnd( int& column , int& line ) |
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132 | { |
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133 | _screen->getSelectionEnd(column,line); |
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134 | line -= currentLine(); |
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135 | } |
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136 | void ScreenWindow::setSelectionStart( int column , int line , bool columnMode ) |
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137 | { |
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138 | _screen->setSelectionStart( column , qMin(line + currentLine(),endWindowLine()) , columnMode); |
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139 | |
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140 | _bufferNeedsUpdate = true; |
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141 | emit selectionChanged(); |
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142 | } |
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143 | |
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144 | void ScreenWindow::setSelectionEnd( int column , int line ) |
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145 | { |
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146 | _screen->setSelectionEnd( column , qMin(line + currentLine(),endWindowLine()) ); |
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147 | |
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148 | _bufferNeedsUpdate = true; |
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149 | emit selectionChanged(); |
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150 | } |
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151 | |
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152 | bool ScreenWindow::isSelected( int column , int line ) |
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153 | { |
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154 | return _screen->isSelected( column , qMin(line + currentLine(),endWindowLine()) ); |
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155 | } |
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156 | |
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157 | void ScreenWindow::clearSelection() |
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158 | { |
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159 | _screen->clearSelection(); |
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160 | |
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161 | emit selectionChanged(); |
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162 | } |
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163 | |
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164 | void ScreenWindow::setWindowLines(int lines) |
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165 | { |
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166 | Q_ASSERT(lines > 0); |
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167 | _windowLines = lines; |
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168 | } |
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169 | int ScreenWindow::windowLines() const |
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170 | { |
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171 | return _windowLines; |
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172 | } |
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173 | |
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174 | int ScreenWindow::windowColumns() const |
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175 | { |
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176 | return _screen->getColumns(); |
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177 | } |
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178 | |
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179 | int ScreenWindow::lineCount() const |
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180 | { |
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181 | return _screen->getHistLines() + _screen->getLines(); |
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182 | } |
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183 | |
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184 | int ScreenWindow::columnCount() const |
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185 | { |
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186 | return _screen->getColumns(); |
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187 | } |
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188 | |
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189 | QPoint ScreenWindow::cursorPosition() const |
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190 | { |
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191 | QPoint position; |
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192 | |
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193 | position.setX( _screen->getCursorX() ); |
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194 | position.setY( _screen->getCursorY() ); |
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195 | |
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196 | return position; |
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197 | } |
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198 | |
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199 | int ScreenWindow::currentLine() const |
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200 | { |
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201 | return qBound(0,_currentLine,lineCount()-windowLines()); |
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202 | } |
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203 | |
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204 | void ScreenWindow::scrollBy( RelativeScrollMode mode , int amount ) |
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205 | { |
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206 | if ( mode == ScrollLines ) |
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207 | { |
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208 | scrollTo( currentLine() + amount ); |
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209 | } |
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210 | else if ( mode == ScrollPages ) |
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211 | { |
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212 | scrollTo( currentLine() + amount * ( windowLines() / 2 ) ); |
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213 | } |
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214 | } |
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215 | |
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216 | bool ScreenWindow::atEndOfOutput() const |
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217 | { |
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218 | return currentLine() == (lineCount()-windowLines()); |
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219 | } |
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220 | |
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221 | void ScreenWindow::scrollTo( int line ) |
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222 | { |
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223 | int maxCurrentLineNumber = lineCount() - windowLines(); |
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224 | line = qBound(0,line,maxCurrentLineNumber); |
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225 | |
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226 | const int delta = line - _currentLine; |
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227 | _currentLine = line; |
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228 | |
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229 | // keep track of number of lines scrolled by, |
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230 | // this can be reset by calling resetScrollCount() |
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231 | _scrollCount += delta; |
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232 | |
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233 | _bufferNeedsUpdate = true; |
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234 | |
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235 | emit scrolled(_currentLine); |
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236 | } |
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237 | |
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238 | void ScreenWindow::setTrackOutput(bool trackOutput) |
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239 | { |
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240 | _trackOutput = trackOutput; |
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241 | } |
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242 | |
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243 | bool ScreenWindow::trackOutput() const |
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244 | { |
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245 | return _trackOutput; |
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246 | } |
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247 | |
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248 | int ScreenWindow::scrollCount() const |
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249 | { |
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250 | return _scrollCount; |
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251 | } |
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252 | |
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253 | void ScreenWindow::resetScrollCount() |
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254 | { |
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255 | _scrollCount = 0; |
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256 | } |
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257 | |
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258 | QRect ScreenWindow::scrollRegion() const |
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259 | { |
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260 | bool equalToScreenSize = windowLines() == _screen->getLines(); |
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261 | |
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262 | if ( atEndOfOutput() && equalToScreenSize ) |
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263 | return _screen->lastScrolledRegion(); |
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264 | else |
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265 | return QRect(0,0,windowColumns(),windowLines()); |
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266 | } |
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267 | |
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268 | void ScreenWindow::notifyOutputChanged() |
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269 | { |
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270 | // move window to the bottom of the screen and update scroll count |
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271 | // if this window is currently tracking the bottom of the screen |
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272 | if ( _trackOutput ) |
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273 | { |
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274 | _scrollCount -= _screen->scrolledLines(); |
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275 | _currentLine = qMax(0,_screen->getHistLines() - (windowLines()-_screen->getLines())); |
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276 | } |
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277 | else |
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278 | { |
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279 | // if the history is not unlimited then it may |
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280 | // have run out of space and dropped the oldest |
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281 | // lines of output - in this case the screen |
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282 | // window's current line number will need to |
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283 | // be adjusted - otherwise the output will scroll |
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284 | _currentLine = qMax(0,_currentLine - |
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285 | _screen->droppedLines()); |
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286 | |
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287 | // ensure that the screen window's current position does |
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288 | // not go beyond the bottom of the screen |
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289 | _currentLine = qMin( _currentLine , _screen->getHistLines() ); |
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290 | } |
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291 | |
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292 | _bufferNeedsUpdate = true; |
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293 | |
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294 | emit outputChanged(); |
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295 | } |
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296 | |
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297 | //#include "moc_ScreenWindow.cpp" |
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