| 1 | // %flair:license{
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| 2 | // This file is part of the Flair framework distributed under the
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| 3 | // CECILL-C License, Version 1.0.
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| 4 | // %flair:license}
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| 5 | #include <qstyle.h>
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| 6 | #include <qstyleoption.h>
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| 7 | #include "Scrollbar.h"
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| 8 |
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| 9 | ScrollBar::ScrollBar(QWidget * parent):
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| 10 | QScrollBar(parent)
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| 11 | {
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| 12 | init();
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| 13 | }
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| 14 |
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| 15 | ScrollBar::ScrollBar(Qt::Orientation o,
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| 16 | QWidget *parent):
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| 17 | QScrollBar(o, parent)
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| 18 | {
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| 19 | init();
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| 20 | }
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| 21 |
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| 22 | ScrollBar::ScrollBar(float minBase, float maxBase,
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| 23 | Qt::Orientation o, QWidget *parent):
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| 24 | QScrollBar(o, parent)
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| 25 | {
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| 26 | init();
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| 27 | setBase(minBase, maxBase);
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| 28 | moveSlider(minBase, maxBase);
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| 29 | }
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| 30 |
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| 31 | void ScrollBar::init(void)
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| 32 | {
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| 33 | d_inverted = orientation() == Qt::Vertical;
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| 34 | d_baseTicks = 1000000;
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| 35 | d_minBase = 0.0;
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| 36 | d_maxBase = 1.0;
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| 37 | moveSlider(d_minBase, d_maxBase);
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| 38 |
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| 39 | connect(this, SIGNAL(sliderMoved(int)), SLOT(catchSliderMoved(int)));
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| 40 | connect(this, SIGNAL(valueChanged(int)), SLOT(catchValueChanged(int)));
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| 41 | }
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| 42 |
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| 43 | void ScrollBar::setInverted(bool inverted)
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| 44 | {
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| 45 | if ( d_inverted != inverted )
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| 46 | {
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| 47 | d_inverted = inverted;
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| 48 | moveSlider(minSliderValue(), maxSliderValue());
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | bool ScrollBar::isInverted(void) const
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| 53 | {
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| 54 | return d_inverted;
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| 55 | }
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| 56 |
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| 57 | void ScrollBar::setBase(float min, float max)
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| 58 | {
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| 59 | if ( min != d_minBase || max != d_maxBase )
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| 60 | {
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| 61 | d_minBase = min;
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| 62 | d_maxBase = max;
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| 63 |
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| 64 | moveSlider(minSliderValue(), maxSliderValue());
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| 65 | }
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| 66 | }
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| 67 |
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| 68 | void ScrollBar::moveSlider(float min, float max)
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| 69 | {
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| 70 | const int sliderTicks = qRound((max - min) /
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| 71 | (d_maxBase - d_minBase) * d_baseTicks);
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| 72 |
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| 73 | // setRange initiates a valueChanged of the scrollbars
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| 74 | // in some situations. So we block
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| 75 | // and unblock the signals.
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| 76 |
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| 77 | blockSignals(true);
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| 78 |
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| 79 | setRange(sliderTicks / 2, d_baseTicks - sliderTicks / 2);
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| 80 | int steps = sliderTicks / 200;
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| 81 | if ( steps <= 0 )
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| 82 | steps = 1;
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| 83 |
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| 84 | setSingleStep(steps);
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| 85 | setPageStep(sliderTicks);
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| 86 |
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| 87 | int tick = mapToTick(min + (max - min) / 2);
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| 88 | if ( isInverted() )
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| 89 | tick = d_baseTicks - tick;
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| 90 |
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| 91 | setSliderPosition(tick);
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| 92 | blockSignals(false);
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| 93 | }
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| 94 |
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| 95 | float ScrollBar::minBaseValue(void) const
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| 96 | {
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| 97 | return d_minBase;
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| 98 | }
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| 99 |
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| 100 | float ScrollBar::maxBaseValue(void) const
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| 101 | {
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| 102 | return d_maxBase;
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| 103 | }
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| 104 |
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| 105 | void ScrollBar::sliderRange(int value, float &min, float &max) const
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| 106 | {
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| 107 | if ( isInverted() )
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| 108 | value = d_baseTicks - value;
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| 109 |
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| 110 | const int visibleTicks = pageStep();
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| 111 |
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| 112 | min = mapFromTick(value - visibleTicks / 2);
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| 113 | max = mapFromTick(value + visibleTicks / 2);
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| 114 | }
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| 115 |
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| 116 | float ScrollBar::minSliderValue(void) const
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| 117 | {
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| 118 | float min, dummy;
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| 119 | sliderRange(value(), min, dummy);
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| 120 |
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| 121 | return min;
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| 122 | }
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| 123 |
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| 124 | float ScrollBar::maxSliderValue(void) const
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| 125 | {
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| 126 | float max, dummy;
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| 127 | sliderRange(value(), dummy, max);
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| 128 |
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| 129 | return max;
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| 130 | }
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| 131 |
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| 132 | int ScrollBar::mapToTick(float v) const
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| 133 | {
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| 134 | return (int) ( ( v - d_minBase) / (d_maxBase - d_minBase ) * d_baseTicks );
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| 135 | }
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| 136 |
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| 137 | float ScrollBar::mapFromTick(int tick) const
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| 138 | {
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| 139 | return d_minBase + ( d_maxBase - d_minBase ) * tick / d_baseTicks;
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| 140 | }
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| 141 |
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| 142 | void ScrollBar::catchValueChanged(int value)
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| 143 | {
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| 144 | float min, max;
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| 145 | sliderRange(value, min, max);
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| 146 | Q_EMIT valueChanged(orientation(), min, max);
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| 147 | }
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| 148 |
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| 149 | void ScrollBar::catchSliderMoved(int value)
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| 150 | {
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| 151 | float min, max;
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| 152 | sliderRange(value, min, max);
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| 153 | Q_EMIT sliderMoved(orientation(), min, max);
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| 154 | }
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| 155 |
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| 156 | int ScrollBar::extent(void) const
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| 157 | {
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| 158 | QStyleOptionSlider opt;
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| 159 | opt.init(this);
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| 160 | opt.subControls = QStyle::SC_None;
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| 161 | opt.activeSubControls = QStyle::SC_None;
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| 162 | opt.orientation = orientation();
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| 163 | opt.minimum = minimum();
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| 164 | opt.maximum = maximum();
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| 165 | opt.sliderPosition = sliderPosition();
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| 166 | opt.sliderValue = value();
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| 167 | opt.singleStep = singleStep();
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| 168 | opt.pageStep = pageStep();
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| 169 | opt.upsideDown = invertedAppearance();
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| 170 | if (orientation() == Qt::Horizontal)
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| 171 | opt.state |= QStyle::State_Horizontal;
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| 172 | return style()->pixelMetric(QStyle::PM_ScrollBarExtent, &opt, this);
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| 173 | }
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