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