QT滚动数字 滚动选择器 滑动选择器 支持循环

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); //auto selectTime1 = new selectTime(this); auto selectTime1 = new RollingBox(this); selectTime1->resize(200, 100); } Widget::~Widget() { delete ui; } RollingBox::RollingBox(QWidget *parent) : QWidget(parent),m_minRange(0),m_maxRange(10), m_rangeSpan(m_maxRange-m_minRange+1), m_currentValue(5),isDragging(0),m_deviation(0),m_numSize(6) { homingAni = new QPropertyAnimation(this,"deviation");//动画用于将选中数字归到中间位置 homingAni->setDuration(300); homingAni->setEasingCurve(QEasingCurve::OutQuad); } void RollingBox::setRange(int min,int max) { m_minRange = min; m_maxRange = max; m_rangeSpan = m_maxRange - m_minRange + 1; if(m_currentValue < min) m_currentValue = min; if(m_currentValue > max) m_currentValue = max; //计算字符尺寸 m_numSize = 3; int temp = m_maxRange; while(temp > 0) { temp /= 10; m_numSize++; } repaint(); } int RollingBox::readValue() { return m_currentValue; } void RollingBox::mousePressEvent(QMouseEvent *e) { homingAni->stop(); isDragging = 1; m_mouseSrcPos = e->pos().x(); } void RollingBox::mouseMoveEvent(QMouseEvent *e) { if(isDragging) { //数值到边界时，阻止继续往对应方向移动 // if((m_currentValue == m_minRange && e->pos().x() >= m_mouseSrcPos)|| // (m_currentValue == m_maxRange && e->pos().x() <= m_mouseSrcPos)) // return; m_deviation = e->pos().x() - m_mouseSrcPos; //若移动速度过快时进行限制 if(m_deviation > (width()-1)/4) m_deviation = (width()-1)/4; else if(m_deviation < -(width()-1)/4) m_deviation = -(width()-1)/4; emit deviationChange((float)m_deviation/((width()-1)/4)); repaint(); } } void RollingBox::mouseReleaseEvent(QMouseEvent *) { if(isDragging) { isDragging = 0; homing(); } } void RollingBox::paintEvent(QPaintEvent *) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing, true); int Width = width()-1; int Height = height()-1; //计算当前中心数字，及位置 if(m_deviation >= Width/4) { m_mouseSrcPos += Width/4; m_deviation -= Width/4; m_currentValue -= 1; } if(m_deviation <= -Width/4) { m_mouseSrcPos -= Width/4; m_deviation += Width/4; m_currentValue += 1; } //中间数字 paintNum(painter,calculateLoopNum(m_currentValue),m_deviation); //两侧数字1 paintNum(painter,calculateLoopNum(m_currentValue-1),m_deviation-Width/4); paintNum(painter,calculateLoopNum(m_currentValue+1),m_deviation+Width/4); //两侧数字2 if(m_deviation >= 0) paintNum(painter,calculateLoopNum(m_currentValue-2),m_deviation-Width/2); if(m_deviation <= 0) paintNum(painter,calculateLoopNum(m_currentValue+2),m_deviation+Width/2); //边框 painter.setPen(QPen(QColor(0,0,0,120),2)); painter.drawLine(Width/8*3,0,Width/8*3,Height); painter.drawLine(Width/8*5,0,Width/8*5,Height); } void RollingBox::paintNum(QPainter &painter,int num,int deviation) { int Width = width()-1; int Height = height()-1; int size = (Width - qAbs(deviation))/m_numSize;//字体大小，距离中心越远越小 int transparency = 255-510*qAbs(deviation)/Width;//字体透明度，距离中心越远越透明 int width = Width/2-3*qAbs(deviation)/4;//数字宽度，距离中心越远越小 int x = Width/2+deviation-width/2;//数字左边界 QFont font; font.setPixelSize(size); painter.setFont(font); painter.setPen(QColor(0,0,0,transparency)); painter.drawText(QRectF(x,0,width,Height), Qt::AlignCenter, QString::number(num)); } void RollingBox::homing() { //将数字矫正到中心 if(m_deviation > width()/8) { homingAni->setStartValue((width()-1)/8-m_deviation); homingAni->setEndValue(0); m_currentValue--; } else if(m_deviation > -width()/8) { homingAni->setStartValue(m_deviation); homingAni->setEndValue(0); } else if(m_deviation < -width()/8) { homingAni->setStartValue(-(width()-1)/8-m_deviation); homingAni->setEndValue(0); m_currentValue++; } m_currentValue = calculateLoopNum(m_currentValue); emit currentValueChanged(m_currentValue); homingAni->start(); } int RollingBox::readDeviation() { return m_deviation; } void RollingBox::setDeviation(int n) { m_deviation = n; repaint(); } int RollingBox::calculateLoopNum(int num) { while (num < m_minRange) num += m_rangeSpan; while (num > m_maxRange) num -= m_rangeSpan; return num; }