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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 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the demonstration applications of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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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 #include "chasewidget.h" |
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43 |
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44 #include <QtCore/QPoint> |
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45 |
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46 #include <QtGui/QApplication> |
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47 #include <QtGui/QHideEvent> |
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48 #include <QtGui/QPainter> |
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49 #include <QtGui/QPaintEvent> |
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50 #include <QtGui/QShowEvent> |
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51 |
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52 ChaseWidget::ChaseWidget(QWidget *parent, QPixmap pixmap, bool pixmapEnabled) |
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53 : QWidget(parent) |
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54 , m_segment(0) |
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55 , m_delay(100) |
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56 , m_step(40) |
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57 , m_timerId(-1) |
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58 , m_animated(false) |
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59 , m_pixmap(pixmap) |
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60 , m_pixmapEnabled(pixmapEnabled) |
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61 { |
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62 } |
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63 |
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64 void ChaseWidget::setAnimated(bool value) |
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65 { |
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66 if (m_animated == value) |
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67 return; |
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68 m_animated = value; |
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69 if (m_timerId != -1) { |
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70 killTimer(m_timerId); |
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71 m_timerId = -1; |
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72 } |
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73 if (m_animated) { |
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74 m_segment = 0; |
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75 m_timerId = startTimer(m_delay); |
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76 } |
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77 update(); |
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78 } |
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79 |
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80 void ChaseWidget::paintEvent(QPaintEvent *event) |
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81 { |
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82 Q_UNUSED(event); |
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83 QPainter p(this); |
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84 if (m_pixmapEnabled && !m_pixmap.isNull()) { |
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85 p.drawPixmap(0, 0, m_pixmap); |
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86 return; |
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87 } |
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88 |
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89 const int extent = qMin(width() - 8, height() - 8); |
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90 const int displ = extent / 4; |
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91 const int ext = extent / 4 - 1; |
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92 |
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93 p.setRenderHint(QPainter::Antialiasing, true); |
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94 |
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95 if(m_animated) |
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96 p.setPen(Qt::gray); |
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97 else |
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98 p.setPen(QPen(palette().dark().color())); |
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99 |
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100 p.translate(width() / 2, height() / 2); // center |
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101 |
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102 for (int segment = 0; segment < segmentCount(); ++segment) { |
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103 p.rotate(QApplication::isRightToLeft() ? m_step : -m_step); |
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104 if(m_animated) |
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105 p.setBrush(colorForSegment(segment)); |
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106 else |
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107 p.setBrush(palette().background()); |
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108 p.drawEllipse(QRect(displ, -ext / 2, ext, ext)); |
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109 } |
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110 } |
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111 |
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112 QSize ChaseWidget::sizeHint() const |
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113 { |
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114 return QSize(32, 32); |
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115 } |
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116 |
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117 void ChaseWidget::timerEvent(QTimerEvent *event) |
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118 { |
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119 if (event->timerId() == m_timerId) { |
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120 ++m_segment; |
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121 update(); |
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122 } |
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123 QWidget::timerEvent(event); |
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124 } |
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125 |
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126 QColor ChaseWidget::colorForSegment(int seg) const |
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127 { |
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128 int index = ((seg + m_segment) % segmentCount()); |
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129 int comp = qMax(0, 255 - (index * (255 / segmentCount()))); |
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130 return QColor(comp, comp, comp, 255); |
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131 } |
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132 |
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133 int ChaseWidget::segmentCount() const |
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134 { |
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135 return 360 / m_step; |
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136 } |
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137 |
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138 void ChaseWidget::setPixmapEnabled(bool enable) |
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139 { |
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140 m_pixmapEnabled = enable; |
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141 } |
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142 |