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5.15.8 qslider.cpp original
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5.15.8/qtbase/src/widgets/widgets/qslider.cpp
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552
5.15.8/qtbase/src/widgets/widgets/qslider.cpp
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/****************************************************************************
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**
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** Copyright (C) 2021 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtWidgets module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:COMM$
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** $QT_END_LICENSE$
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**
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**
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**
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**
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**
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**
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**
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**
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**
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**
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**
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**
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**
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**
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**
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****************************************************************************/
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#include "qslider.h"
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#ifndef QT_NO_ACCESSIBILITY
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#include "qaccessible.h"
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#endif
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#include "qapplication.h"
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#include "qevent.h"
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#include "qpainter.h"
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#include "qstyle.h"
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#include "qstyleoption.h"
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#include "private/qapplication_p.h"
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#include "private/qabstractslider_p.h"
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#include "qdebug.h"
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QT_BEGIN_NAMESPACE
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class QSliderPrivate : public QAbstractSliderPrivate
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{
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Q_DECLARE_PUBLIC(QSlider)
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public:
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QStyle::SubControl pressedControl;
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int tickInterval;
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QSlider::TickPosition tickPosition;
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int clickOffset;
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void init();
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void resetLayoutItemMargins();
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int pixelPosToRangeValue(int pos) const;
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inline int pick(const QPoint &pt) const;
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QStyle::SubControl newHoverControl(const QPoint &pos);
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bool updateHoverControl(const QPoint &pos);
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QStyle::SubControl hoverControl;
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QRect hoverRect;
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};
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void QSliderPrivate::init()
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{
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Q_Q(QSlider);
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pressedControl = QStyle::SC_None;
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tickInterval = 0;
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tickPosition = QSlider::NoTicks;
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hoverControl = QStyle::SC_None;
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q->setFocusPolicy(Qt::FocusPolicy(q->style()->styleHint(QStyle::SH_Button_FocusPolicy)));
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QSizePolicy sp(QSizePolicy::Expanding, QSizePolicy::Fixed, QSizePolicy::Slider);
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if (orientation == Qt::Vertical)
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sp.transpose();
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q->setSizePolicy(sp);
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q->setAttribute(Qt::WA_WState_OwnSizePolicy, false);
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resetLayoutItemMargins();
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}
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void QSliderPrivate::resetLayoutItemMargins()
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{
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Q_Q(QSlider);
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QStyleOptionSlider opt;
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q->initStyleOption(&opt);
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setLayoutItemMargins(QStyle::SE_SliderLayoutItem, &opt);
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}
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int QSliderPrivate::pixelPosToRangeValue(int pos) const
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{
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Q_Q(const QSlider);
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QStyleOptionSlider opt;
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q->initStyleOption(&opt);
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QRect gr = q->style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderGroove, q);
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QRect sr = q->style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, q);
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int sliderMin, sliderMax, sliderLength;
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if (orientation == Qt::Horizontal) {
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sliderLength = sr.width();
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sliderMin = gr.x();
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sliderMax = gr.right() - sliderLength + 1;
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} else {
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sliderLength = sr.height();
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sliderMin = gr.y();
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sliderMax = gr.bottom() - sliderLength + 1;
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}
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return QStyle::sliderValueFromPosition(minimum, maximum, pos - sliderMin,
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sliderMax - sliderMin, opt.upsideDown);
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}
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inline int QSliderPrivate::pick(const QPoint &pt) const
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{
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return orientation == Qt::Horizontal ? pt.x() : pt.y();
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}
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/*!
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Initialize \a option with the values from this QSlider. This method
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is useful for subclasses when they need a QStyleOptionSlider, but don't want
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to fill in all the information themselves.
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\sa QStyleOption::initFrom()
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*/
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void QSlider::initStyleOption(QStyleOptionSlider *option) const
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{
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if (!option)
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return;
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Q_D(const QSlider);
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option->initFrom(this);
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option->subControls = QStyle::SC_None;
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option->activeSubControls = QStyle::SC_None;
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option->orientation = d->orientation;
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option->maximum = d->maximum;
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option->minimum = d->minimum;
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option->tickPosition = (QSlider::TickPosition)d->tickPosition;
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option->tickInterval = d->tickInterval;
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option->upsideDown = (d->orientation == Qt::Horizontal) ?
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(d->invertedAppearance != (option->direction == Qt::RightToLeft))
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: (!d->invertedAppearance);
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option->direction = Qt::LeftToRight; // we use the upsideDown option instead
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option->sliderPosition = d->position;
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option->sliderValue = d->value;
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option->singleStep = d->singleStep;
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option->pageStep = d->pageStep;
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if (d->orientation == Qt::Horizontal)
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option->state |= QStyle::State_Horizontal;
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}
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bool QSliderPrivate::updateHoverControl(const QPoint &pos)
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{
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Q_Q(QSlider);
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QRect lastHoverRect = hoverRect;
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QStyle::SubControl lastHoverControl = hoverControl;
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bool doesHover = q->testAttribute(Qt::WA_Hover);
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if (lastHoverControl != newHoverControl(pos) && doesHover) {
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q->update(lastHoverRect);
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q->update(hoverRect);
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return true;
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}
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return !doesHover;
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}
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QStyle::SubControl QSliderPrivate::newHoverControl(const QPoint &pos)
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{
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Q_Q(QSlider);
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QStyleOptionSlider opt;
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q->initStyleOption(&opt);
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opt.subControls = QStyle::SC_All;
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QRect handleRect = q->style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, q);
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QRect grooveRect = q->style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderGroove, q);
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QRect tickmarksRect = q->style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderTickmarks, q);
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if (handleRect.contains(pos)) {
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hoverRect = handleRect;
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hoverControl = QStyle::SC_SliderHandle;
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} else if (grooveRect.contains(pos)) {
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hoverRect = grooveRect;
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hoverControl = QStyle::SC_SliderGroove;
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} else if (tickmarksRect.contains(pos)) {
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hoverRect = tickmarksRect;
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hoverControl = QStyle::SC_SliderTickmarks;
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} else {
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hoverRect = QRect();
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hoverControl = QStyle::SC_None;
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}
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return hoverControl;
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}
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/*!
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\class QSlider
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\brief The QSlider widget provides a vertical or horizontal slider.
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\ingroup basicwidgets
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\inmodule QtWidgets
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\image windows-slider.png
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The slider is the classic widget for controlling a bounded value.
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It lets the user move a slider handle along a horizontal or vertical
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groove and translates the handle's position into an integer value
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within the legal range.
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QSlider has very few of its own functions; most of the functionality is in
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QAbstractSlider. The most useful functions are setValue() to set
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the slider directly to some value; triggerAction() to simulate
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the effects of clicking (useful for shortcut keys);
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setSingleStep(), setPageStep() to set the steps; and setMinimum()
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and setMaximum() to define the range of the scroll bar.
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QSlider provides methods for controlling tickmarks. You can use
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setTickPosition() to indicate where you want the tickmarks to be,
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setTickInterval() to indicate how many of them you want. the
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currently set tick position and interval can be queried using the
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tickPosition() and tickInterval() functions, respectively.
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QSlider inherits a comprehensive set of signals:
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\table
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\header \li Signal \li Description
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\row \li \l valueChanged()
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\li Emitted when the slider's value has changed. The tracking()
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determines whether this signal is emitted during user
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interaction.
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\row \li \l sliderPressed()
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\li Emitted when the user starts to drag the slider.
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\row \li \l sliderMoved()
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\li Emitted when the user drags the slider.
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\row \li \l sliderReleased()
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\li Emitted when the user releases the slider.
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\endtable
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QSlider only provides integer ranges. Note that although
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QSlider handles very large numbers, it becomes difficult for users
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to use a slider accurately for very large ranges.
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A slider accepts focus on Tab and provides both a mouse wheel and a
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keyboard interface. The keyboard interface is the following:
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\list
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\li Left/Right move a horizontal slider by one single step.
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\li Up/Down move a vertical slider by one single step.
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\li PageUp moves up one page.
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\li PageDown moves down one page.
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\li Home moves to the start (mininum).
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\li End moves to the end (maximum).
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\endlist
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\sa QScrollBar, QSpinBox, QDial, {fowler}{GUI Design Handbook: Slider}, {Sliders Example}
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*/
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/*!
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\enum QSlider::TickPosition
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This enum specifies where the tick marks are to be drawn relative
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to the slider's groove and the handle the user moves.
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\value NoTicks Do not draw any tick marks.
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\value TicksBothSides Draw tick marks on both sides of the groove.
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\value TicksAbove Draw tick marks above the (horizontal) slider
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\value TicksBelow Draw tick marks below the (horizontal) slider
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\value TicksLeft Draw tick marks to the left of the (vertical) slider
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\value TicksRight Draw tick marks to the right of the (vertical) slider
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*/
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/*!
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Constructs a vertical slider with the given \a parent.
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*/
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QSlider::QSlider(QWidget *parent)
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: QSlider(Qt::Vertical, parent)
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{
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}
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/*!
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Constructs a slider with the given \a parent. The \a orientation
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parameter determines whether the slider is horizontal or vertical;
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the valid values are Qt::Vertical and Qt::Horizontal.
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*/
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QSlider::QSlider(Qt::Orientation orientation, QWidget *parent)
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: QAbstractSlider(*new QSliderPrivate, parent)
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{
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d_func()->orientation = orientation;
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d_func()->init();
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}
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/*!
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Destroys this slider.
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*/
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QSlider::~QSlider()
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{
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}
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/*!
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\reimp
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*/
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void QSlider::paintEvent(QPaintEvent *)
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{
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Q_D(QSlider);
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QPainter p(this);
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QStyleOptionSlider opt;
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initStyleOption(&opt);
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opt.subControls = QStyle::SC_SliderGroove | QStyle::SC_SliderHandle;
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if (d->tickPosition != NoTicks)
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opt.subControls |= QStyle::SC_SliderTickmarks;
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if (d->pressedControl) {
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opt.activeSubControls = d->pressedControl;
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opt.state |= QStyle::State_Sunken;
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} else {
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opt.activeSubControls = d->hoverControl;
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}
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style()->drawComplexControl(QStyle::CC_Slider, &opt, &p, this);
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}
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/*!
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\reimp
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*/
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bool QSlider::event(QEvent *event)
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{
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Q_D(QSlider);
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switch(event->type()) {
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case QEvent::HoverEnter:
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case QEvent::HoverLeave:
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case QEvent::HoverMove:
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if (const QHoverEvent *he = static_cast<const QHoverEvent *>(event))
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d->updateHoverControl(he->pos());
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break;
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case QEvent::StyleChange:
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case QEvent::MacSizeChange:
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d->resetLayoutItemMargins();
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break;
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default:
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break;
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}
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return QAbstractSlider::event(event);
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}
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/*!
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\reimp
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*/
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void QSlider::mousePressEvent(QMouseEvent *ev)
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{
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Q_D(QSlider);
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if (d->maximum == d->minimum || (ev->buttons() ^ ev->button())) {
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ev->ignore();
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return;
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}
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#ifdef QT_KEYPAD_NAVIGATION
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if (QApplicationPrivate::keypadNavigationEnabled())
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setEditFocus(true);
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#endif
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ev->accept();
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if ((ev->button() & style()->styleHint(QStyle::SH_Slider_AbsoluteSetButtons)) == ev->button()) {
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QStyleOptionSlider opt;
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initStyleOption(&opt);
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const QRect sliderRect = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
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const QPoint center = sliderRect.center() - sliderRect.topLeft();
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// to take half of the slider off for the setSliderPosition call we use the center - topLeft
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setSliderPosition(d->pixelPosToRangeValue(d->pick(ev->pos() - center)));
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triggerAction(SliderMove);
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setRepeatAction(SliderNoAction);
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d->pressedControl = QStyle::SC_SliderHandle;
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update();
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} else if ((ev->button() & style()->styleHint(QStyle::SH_Slider_PageSetButtons)) == ev->button()) {
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QStyleOptionSlider opt;
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initStyleOption(&opt);
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d->pressedControl = style()->hitTestComplexControl(QStyle::CC_Slider,
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&opt, ev->pos(), this);
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SliderAction action = SliderNoAction;
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if (d->pressedControl == QStyle::SC_SliderGroove) {
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const QRect sliderRect = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
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||||||
|
int pressValue = d->pixelPosToRangeValue(d->pick(ev->pos() - sliderRect.center() + sliderRect.topLeft()));
|
||||||
|
d->pressValue = pressValue;
|
||||||
|
if (pressValue > d->value)
|
||||||
|
action = SliderPageStepAdd;
|
||||||
|
else if (pressValue < d->value)
|
||||||
|
action = SliderPageStepSub;
|
||||||
|
if (action) {
|
||||||
|
triggerAction(action);
|
||||||
|
setRepeatAction(action);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
ev->ignore();
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (d->pressedControl == QStyle::SC_SliderHandle) {
|
||||||
|
QStyleOptionSlider opt;
|
||||||
|
initStyleOption(&opt);
|
||||||
|
setRepeatAction(SliderNoAction);
|
||||||
|
QRect sr = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
|
||||||
|
d->clickOffset = d->pick(ev->pos() - sr.topLeft());
|
||||||
|
update(sr);
|
||||||
|
setSliderDown(true);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/*!
|
||||||
|
\reimp
|
||||||
|
*/
|
||||||
|
void QSlider::mouseMoveEvent(QMouseEvent *ev)
|
||||||
|
{
|
||||||
|
Q_D(QSlider);
|
||||||
|
if (d->pressedControl != QStyle::SC_SliderHandle) {
|
||||||
|
ev->ignore();
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
ev->accept();
|
||||||
|
int newPosition = d->pixelPosToRangeValue(d->pick(ev->pos()) - d->clickOffset);
|
||||||
|
QStyleOptionSlider opt;
|
||||||
|
initStyleOption(&opt);
|
||||||
|
setSliderPosition(newPosition);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/*!
|
||||||
|
\reimp
|
||||||
|
*/
|
||||||
|
void QSlider::mouseReleaseEvent(QMouseEvent *ev)
|
||||||
|
{
|
||||||
|
Q_D(QSlider);
|
||||||
|
if (d->pressedControl == QStyle::SC_None || ev->buttons()) {
|
||||||
|
ev->ignore();
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
ev->accept();
|
||||||
|
QStyle::SubControl oldPressed = QStyle::SubControl(d->pressedControl);
|
||||||
|
d->pressedControl = QStyle::SC_None;
|
||||||
|
setRepeatAction(SliderNoAction);
|
||||||
|
if (oldPressed == QStyle::SC_SliderHandle)
|
||||||
|
setSliderDown(false);
|
||||||
|
QStyleOptionSlider opt;
|
||||||
|
initStyleOption(&opt);
|
||||||
|
opt.subControls = oldPressed;
|
||||||
|
update(style()->subControlRect(QStyle::CC_Slider, &opt, oldPressed, this));
|
||||||
|
}
|
||||||
|
|
||||||
|
/*!
|
||||||
|
\reimp
|
||||||
|
*/
|
||||||
|
QSize QSlider::sizeHint() const
|
||||||
|
{
|
||||||
|
Q_D(const QSlider);
|
||||||
|
ensurePolished();
|
||||||
|
const int SliderLength = 84, TickSpace = 5;
|
||||||
|
QStyleOptionSlider opt;
|
||||||
|
initStyleOption(&opt);
|
||||||
|
int thick = style()->pixelMetric(QStyle::PM_SliderThickness, &opt, this);
|
||||||
|
if (d->tickPosition & TicksAbove)
|
||||||
|
thick += TickSpace;
|
||||||
|
if (d->tickPosition & TicksBelow)
|
||||||
|
thick += TickSpace;
|
||||||
|
int w = thick, h = SliderLength;
|
||||||
|
if (d->orientation == Qt::Horizontal) {
|
||||||
|
w = SliderLength;
|
||||||
|
h = thick;
|
||||||
|
}
|
||||||
|
return style()->sizeFromContents(QStyle::CT_Slider, &opt, QSize(w, h), this).expandedTo(QApplication::globalStrut());
|
||||||
|
}
|
||||||
|
|
||||||
|
/*!
|
||||||
|
\reimp
|
||||||
|
*/
|
||||||
|
QSize QSlider::minimumSizeHint() const
|
||||||
|
{
|
||||||
|
Q_D(const QSlider);
|
||||||
|
QSize s = sizeHint();
|
||||||
|
QStyleOptionSlider opt;
|
||||||
|
initStyleOption(&opt);
|
||||||
|
int length = style()->pixelMetric(QStyle::PM_SliderLength, &opt, this);
|
||||||
|
if (d->orientation == Qt::Horizontal)
|
||||||
|
s.setWidth(length);
|
||||||
|
else
|
||||||
|
s.setHeight(length);
|
||||||
|
return s;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*!
|
||||||
|
\property QSlider::tickPosition
|
||||||
|
\brief the tickmark position for this slider
|
||||||
|
|
||||||
|
The valid values are described by the QSlider::TickPosition enum.
|
||||||
|
|
||||||
|
The default value is \l QSlider::NoTicks.
|
||||||
|
|
||||||
|
\sa tickInterval
|
||||||
|
*/
|
||||||
|
|
||||||
|
void QSlider::setTickPosition(TickPosition position)
|
||||||
|
{
|
||||||
|
Q_D(QSlider);
|
||||||
|
d->tickPosition = position;
|
||||||
|
d->resetLayoutItemMargins();
|
||||||
|
update();
|
||||||
|
updateGeometry();
|
||||||
|
}
|
||||||
|
|
||||||
|
QSlider::TickPosition QSlider::tickPosition() const
|
||||||
|
{
|
||||||
|
return d_func()->tickPosition;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*!
|
||||||
|
\property QSlider::tickInterval
|
||||||
|
\brief the interval between tickmarks
|
||||||
|
|
||||||
|
This is a value interval, not a pixel interval. If it is 0, the
|
||||||
|
slider will choose between singleStep and pageStep.
|
||||||
|
|
||||||
|
The default value is 0.
|
||||||
|
|
||||||
|
\sa tickPosition, singleStep, pageStep
|
||||||
|
*/
|
||||||
|
|
||||||
|
void QSlider::setTickInterval(int ts)
|
||||||
|
{
|
||||||
|
d_func()->tickInterval = qMax(0, ts);
|
||||||
|
update();
|
||||||
|
}
|
||||||
|
|
||||||
|
int QSlider::tickInterval() const
|
||||||
|
{
|
||||||
|
return d_func()->tickInterval;
|
||||||
|
}
|
||||||
|
|
||||||
|
Q_WIDGETS_EXPORT QStyleOptionSlider qt_qsliderStyleOption(QSlider *slider)
|
||||||
|
{
|
||||||
|
QStyleOptionSlider sliderOption;
|
||||||
|
slider->initStyleOption(&sliderOption);
|
||||||
|
return sliderOption;
|
||||||
|
}
|
||||||
|
|
||||||
|
QT_END_NAMESPACE
|
||||||
|
|
||||||
|
#include "moc_qslider.cpp"
|
||||||
Loading…
Reference in New Issue
Block a user