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1 /****************************************************************************
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2 **
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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4 ** Contact: Qt Software Information (qt-info@nokia.com)
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5 **
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6 ** This file is part of the demonstration applications of the Qt Toolkit.
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7 **
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8 ** $QT_BEGIN_LICENSE:LGPL$
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9 ** Commercial Usage
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10 ** Licensees holding valid Qt Commercial licenses may use this file in
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11 ** accordance with the Qt Commercial License Agreement provided with the
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12 ** Software or, alternatively, in accordance with the terms contained in
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13 ** a written agreement between you and Nokia.
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14 **
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15 ** GNU Lesser General Public License Usage
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16 ** Alternatively, this file may be used under the terms of the GNU Lesser
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17 ** General Public License version 2.1 as published by the Free Software
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18 ** Foundation and appearing in the file LICENSE.LGPL included in the
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19 ** packaging of this file. Please review the following information to
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20 ** ensure the GNU Lesser General Public License version 2.1 requirements
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21 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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22 **
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23 ** In addition, as a special exception, Nokia gives you certain
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24 ** additional rights. These rights are described in the Nokia Qt LGPL
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25 ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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26 ** package.
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27 **
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28 ** GNU General Public License Usage
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29 ** Alternatively, this file may be used under the terms of the GNU
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30 ** General Public License version 3.0 as published by the Free Software
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31 ** Foundation and appearing in the file LICENSE.GPL included in the
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32 ** packaging of this file. Please review the following information to
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33 ** ensure the GNU General Public License version 3.0 requirements will be
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34 ** met: http://www.gnu.org/copyleft/gpl.html.
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35 **
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36 ** If you are unsure which license is appropriate for your use, please
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37 ** contact the sales department at qt-sales@nokia.com.
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38 ** $QT_END_LICENSE$
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39 **
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40 ****************************************************************************/
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41
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42 module chasewidget;
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43
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44
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45 import QtGui.QWidget;
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46
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47 import QtCore.QSize;
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48 import QtGui.QColor;
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49 import QtGui.QPixmap;
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50
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51 import QtCore.QPoint;
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52
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53 import QtGui.QApplication;
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54 import QtGui.QHideEvent;
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55 import QtGui.QPainter;
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56 import QtGui.QPaintEvent;
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57 import QtGui.QShowEvent;
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58
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59 /*
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60 QT_BEGIN_NAMESPACE
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61 class QHideEvent;
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62 class QShowEvent;
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63 class QPaintEvent;
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64 class QTimerEvent;
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65 QT_END_NAMESPACE
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66 */
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67
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68 class ChaseWidget : public QWidget
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69 {
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70 Q_OBJECT
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71 public:
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72 this(QWidget *parent = 0, QPixmap pixmap = QPixmap(), bool pixmapEnabled = false)
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73 {
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74 super(parent);
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75 m_segment = 0;
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76 m_delay = 100;
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77 m_step = 40;
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78 m_timerId = -1;
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79 m_animated = false;
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80 m_pixmap = pixmap;
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81 m_pixmapEnabled = pixmapEnabled;
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82 }
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83
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84 void setAnimated(bool value)
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85 {
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86 if (m_animated == value)
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87 return;
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88 m_animated = value;
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89 if (m_timerId != -1) {
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90 killTimer(m_timerId);
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91 m_timerId = -1;
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92 }
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93 if (m_animated) {
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94 m_segment = 0;
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95 m_timerId = startTimer(m_delay);
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96 }
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97 update();
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98 }
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99
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100 void setPixmapEnabled(bool enable);
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101 {
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102 m_pixmapEnabled = enable;
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103 }
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104
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105
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106 QSize sizeHint()
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107 {
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108 return QSize(32, 32);
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109 }
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110
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111 protected:
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112 void paintEvent(QPaintEvent *event)
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113 {
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114 Q_UNUSED(event);
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115 QPainter p(this);
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116 if (m_pixmapEnabled && !m_pixmap.isNull()) {
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117 p.drawPixmap(0, 0, m_pixmap);
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118 return;
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119 }
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120
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121 int extent = qMin(width() - 8, height() - 8);
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122 int displ = extent / 4;
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123 int ext = extent / 4 - 1;
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124
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125 p.setRenderHint(QPainter::Antialiasing, true);
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126
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127 if(m_animated)
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128 p.setPen(Qt.gray);
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129 else
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130 p.setPen(QPen(palette().dark().color()));
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131
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132 p.translate(width() / 2, height() / 2); // center
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133
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134 for (int segment = 0; segment < segmentCount(); ++segment) {
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135 p.rotate(QApplication::isRightToLeft() ? m_step : -m_step);
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136 if(m_animated)
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137 p.setBrush(colorForSegment(segment));
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138 else
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139 p.setBrush(palette().background());
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140 p.drawEllipse(QRect(displ, -ext / 2, ext, ext));
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141 }
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142 }
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143
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144 void timerEvent(QTimerEvent *event)
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145 {
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146 if (event->timerId() == m_timerId) {
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147 ++m_segment;
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148 update();
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149 }
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150 QWidget.timerEvent(event);
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151 }
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152
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153 private:
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154 int segmentCount()
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155 {
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156 return 360 / m_step;
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157 }
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158
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159
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160 QColor colorForSegment(int seg)
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161 {
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162 int index = ((seg + m_segment) % segmentCount());
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163 int comp = qMax(0, 255 - (index * (255 / segmentCount())));
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164 return QColor(comp, comp, comp, 255);
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165 }
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166
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167 int m_segment;
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168 int m_delay;
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169 int m_step;
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170 int m_timerId;
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171 bool m_animated;
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172 QPixmap m_pixmap;
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173 bool m_pixmapEnabled;
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174 }
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