2 GNU GENERAL PUBLIC LICENSE
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3 Version 3, 29 June 2007
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5 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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72 http://www.gnu.org/licenses/gpl-3.0.txt
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75 * @file ffscrollarea.h
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76 * @brief Contains a necessary class declaration.
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78 * @author ComArch S.A.
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83 #ifndef QFFSCROLLAREA_H
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84 #define QFFSCROLLAREA_H
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86 #include <QAbstractScrollArea>
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87 #include <QScrollArea>
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88 #include <QMouseEvent>
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90 #include <QDragMoveEvent>
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94 static const float DEFAULT_SLOWING_DOWN_RATE = 0.85;
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95 static const int DEFAULT_POSIOTION_SUMPLING_TIME = 80;
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96 static const int DEFAULT_KINETIC_ANIMATION_TIME = 50;
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97 static const int DEFAULT_MIN_MOTION_LENGTH = 20;
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100 * @author ComArch S.A.
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104 * @brief A class providing a scrolling view onto another widget.
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106 class FFScrollArea : public QScrollArea
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111 FFScrollArea(QWidget* parent = 0);
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113 bool eventFilter(QObject * o, QEvent *event);
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114 void setWidget(QWidget* widget);
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117 float getSlowingDownRate() const;
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118 void setSlowingDownRate(float slowingDownRate_);
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119 int getKineticAnimationTime() const;
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120 void setKineticAnimationTime(int kineticAnimationTime_);
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121 int getPostionSumplingTime() const;
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122 void setPostionSumplingTime(int postionSumplingTime_);
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123 int getMinMotionLength() const;
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124 void setMinMotionLength(int minMotionLength_);
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127 bool moved; ///< is true when widget on scrolarea is moved
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128 bool animate; ///< is true when animation is active
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130 int x; ///< variable to storing cursor global position (X axis)
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131 int y; ///< variable to storing cursor global position (Y axis)
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132 int postionSumplingTime_; ///< period of position sampling
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133 int kineticAnimationTime_; ///< period of one animation's frame
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134 int minMotionLength_; ///< is motion is shorter then this value moved is false
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135 float slowingDownRate_; ///< rate of animation slowing
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137 QPointF pos; ///< cursor position when button was released
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138 QPointF speed; ///< contains motion speed value during kinetic animation
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139 QPointF movement; ///< way's length traveled during mousemoveevent
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140 QPointF prevPos; ///< is used to moving when area is pressed
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141 QPointF oldPos; ///< is used to kinetic
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142 QTimer timerPos; ///< timer is used to sampling cursor position
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143 QTimer timerAnim; ///< timer is used to kinetic animation
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145 void installFilterRecursive(QWidget* widget);
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152 #endif // QFFSCROLLAREA_H
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