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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2006 Chris Cannam.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #include "Panner.h"
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17
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18 #include <QMouseEvent>
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19 #include <QPaintEvent>
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20 #include <QWheelEvent>
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21 #include <QPainter>
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22
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23 #include <iostream>
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24
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25 #include <math.h>
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26
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27 Panner::Panner(QWidget *parent) :
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28 QWidget(parent),
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29 m_rectX(0),
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30 m_rectY(0),
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31 m_rectWidth(1),
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32 m_rectHeight(1),
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33 m_defaultCentreX(0),
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34 m_defaultCentreY(0),
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35 m_defaultsSet(false),
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36 m_thumbColour(palette().highlightedText().color()),
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37 m_backgroundAlpha(255),
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38 m_thumbAlpha(255),
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39 m_clicked(false)
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40 {
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41 }
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42
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43 Panner::~Panner()
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44 {
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45 }
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46
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47 void
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48 Panner::setAlpha(int backgroundAlpha, int thumbAlpha)
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49 {
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50 m_backgroundAlpha = backgroundAlpha;
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51 m_thumbAlpha = thumbAlpha;
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52 }
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53
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54 void
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55 Panner::mousePressEvent(QMouseEvent *e)
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56 {
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57 if (e->button() == Qt::LeftButton) {
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58 m_clicked = true;
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59 m_clickPos = e->pos();
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60 m_dragStartX = m_rectX;
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61 m_dragStartY = m_rectY;
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62 } else if (e->button() == Qt::MidButton) {
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63 resetToDefault();
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64 }
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65 }
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66
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67 void
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68 Panner::mouseDoubleClickEvent(QMouseEvent *e)
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69 {
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70 resetToDefault();
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71 }
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72
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73 void
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74 Panner::mouseMoveEvent(QMouseEvent *e)
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75 {
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76 if (!m_clicked) return;
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77
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78 float dx = float(e->pos().x() - m_clickPos.x()) / float(width());
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79 float dy = float(e->pos().y() - m_clickPos.y()) / float(height());
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80
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81 m_rectX = m_dragStartX + dx;
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82 m_rectY = m_dragStartY + dy;
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83
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84 normalise();
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85 repaint();
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86 emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
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87 emit rectCentreMoved(centreX(), centreY());
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88 }
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89
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90 void
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91 Panner::mouseReleaseEvent(QMouseEvent *e)
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92 {
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93 if (!m_clicked) return;
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94
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95 mouseMoveEvent(e);
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96 m_clicked = false;
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97 }
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98
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99 void
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100 Panner::wheelEvent(QWheelEvent *e)
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101 {
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102 if (e->delta() > 0) {
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103 m_rectY += 0.1;
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104 } else {
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105 m_rectY -= 0.1;
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106 }
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107
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108 normalise();
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109 emitAndUpdate();
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110 }
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111
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112 void
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113 Panner::paintEvent(QPaintEvent *e)
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114 {
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115 QPainter paint(this);
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116 paint.setRenderHint(QPainter::Antialiasing, false);
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117
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118 QColor bg(palette().background().color());
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119 bg.setAlpha(m_backgroundAlpha);
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120
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121 paint.setPen(palette().dark().color());
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122 paint.setBrush(bg);
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123 paint.drawRect(0, 0, width(), height());
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124
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125 QColor hl(m_thumbColour);
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126 hl.setAlpha(m_thumbAlpha);
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127
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128 paint.setBrush(hl);
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129
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130 paint.drawRect(lrintf(width() * m_rectX),
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131 lrintf(height() * m_rectY),
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132 lrintf(width() * m_rectWidth),
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133 lrintf(height() * m_rectHeight));
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134 }
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135
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136 void
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137 Panner::normalise()
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138 {
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139 if (m_rectWidth > 1.0) m_rectWidth = 1.0;
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140 if (m_rectHeight > 1.0) m_rectHeight = 1.0;
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141 if (m_rectX + m_rectWidth > 1.0) m_rectX = 1.0 - m_rectWidth;
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142 if (m_rectX < 0) m_rectX = 0;
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143 if (m_rectY + m_rectHeight > 1.0) m_rectY = 1.0 - m_rectHeight;
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144 if (m_rectY < 0) m_rectY = 0;
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145
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146 if (!m_defaultsSet) {
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147 m_defaultCentreX = centreX();
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148 m_defaultCentreY = centreY();
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149 m_defaultsSet = true;
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150 }
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151 }
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152
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153 void
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154 Panner::emitAndUpdate()
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155 {
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156 emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
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157 emit rectCentreMoved(centreX(), centreY());
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158 update();
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159 }
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160
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161 void
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162 Panner::setRectExtents(float x0, float y0, float width, float height)
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163 {
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164 std::cerr << "Panner::setRectExtents(" << x0 << ", " << y0 << ", "
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165 << width << ", " << height << ")" << std::endl;
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166
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167 if (m_rectX == x0 &&
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168 m_rectY == y0 &&
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169 m_rectWidth == width &&
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170 m_rectHeight == height) {
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171 return;
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172 }
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173
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174 m_rectX = x0;
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175 m_rectY = y0;
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176 m_rectWidth = width;
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177 m_rectHeight = height;
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178
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179 normalise();
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180 emitAndUpdate();
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181 }
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182
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183 void
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184 Panner::setRectWidth(float width)
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185 {
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186 if (m_rectWidth == width) return;
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187 m_rectWidth = width;
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188 normalise();
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189 emitAndUpdate();
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190 }
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191
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192 void
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193 Panner::setRectHeight(float height)
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194 {
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195 if (m_rectHeight == height) return;
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196 m_rectHeight = height;
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197 normalise();
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198 emitAndUpdate();
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199 }
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200
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201 void
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202 Panner::setRectCentreX(float x)
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203 {
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204 float x0 = x - m_rectWidth/2;
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205 if (x0 == m_rectX) return;
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206 m_rectX = x0;
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207 normalise();
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208 emitAndUpdate();
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209 }
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210
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211 void
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212 Panner::setRectCentreY(float y)
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213 {
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214 float y0 = y - m_rectHeight/2;
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215 if (y0 == m_rectY) return;
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216 m_rectY = y0;
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217 normalise();
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218 emitAndUpdate();
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219 }
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220
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221 QSize
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222 Panner::sizeHint() const
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223 {
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224 return QSize(30, 30);
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225 }
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226
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227 void
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228 Panner::setDefaultRectCentre(float cx, float cy)
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229 {
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230 m_defaultCentreX = cx;
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231 m_defaultCentreY = cy;
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232 m_defaultsSet = true;
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233 }
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234
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235 void
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236 Panner::resetToDefault()
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237 {
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238 float x0 = m_defaultCentreX - m_rectWidth/2;
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239 float y0 = m_defaultCentreY - m_rectHeight/2;
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240 if (x0 == m_rectX && y0 == m_rectY) return;
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241 m_rectX = x0;
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242 m_rectY = y0;
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243 normalise();
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244 emitAndUpdate();
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245 }
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246
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247
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