SliderTime.7z

#pragma execution_character_set("utf-8") #include "tumbler.h" #include "qpainter.h" #include "qevent.h" #include "qdebug.h" Tumbler::Tumbler(QWidget *parent) : QWidget(parent) { currentIndex = 0; currentValue = "1"; for (int i = 1; i <= 12; i++) { listValue.append(QString::number(i)); } foreground = QColor(140, 140, 140); background = QColor(40, 40, 40, 0); lineColor = QColor(46, 142, 180, 200); textColor = QColor(255, 255, 255); horizontal = false; percent = 3; offset = 0; pressed = 0; pressedPos = 0; currentPos = 0; setFont(QFont("Arial", 8)); } void Tumbler::wheelEvent(QWheelEvent *e) { //滚动的角度,*8就是鼠标滚动的距离 int degrees = e->delta() / 8; //滚动的步数,*15就是鼠标滚动的角度 int steps = degrees / 15; //如果是正数代表为左边移动,负数代表为右边移动 if (e->orientation() == Qt::Vertical) { int index = currentIndex - steps; if (steps > 0) { if (index > 0) { setCurrentIndex(index); } else { setCurrentIndex(0); } } else { if (index < listValue.count() - 1) { setCurrentIndex(index); } else { setCurrentIndex(listValue.count() - 1); } } } } void Tumbler::mousePressEvent(QMouseEvent *e) { pressed = true; int target = e->pos().x(); if (!horizontal) { target = e->pos().y(); } pressedPos = target; } void Tumbler::mouseMoveEvent(QMouseEvent *e) { int count = listValue.count(); if (count <= 1) { return; } int pos = e->pos().x(); int target = this->width(); if (!horizontal) { pos = e->pos().y(); target = this->height(); } int index = listValue.indexOf(currentValue); if (pressed) { //数值到边界时,阻止继续往对应方向移动 if ((index == 0 && pos >= pressedPos) || (index == count - 1 && pos <= pressedPos)) { return; } offset = pos - pressedPos; //若移动速度过快时进行限制 if (offset > target / percent) { offset = target / percent; } else if (offset < -target / percent) { offset = -target / percent; } static int oldIndex = -1; if (oldIndex != index) { emit currentIndexChanged(index); emit currentValueChanged(listValue.at(index)); oldIndex = index; } update(); } } void Tumbler::mouseReleaseEvent(QMouseEvent *) { if (pressed) { pressed = false; //矫正到居中位置 checkPosition(); } } void Tumbler::paintEvent(QPaintEvent *) { //绘制准备工作,启用反锯齿 QPainter painter(this); painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing); int count = listValue.count(); if (count <= 1) { return; } int target = this->width(); if (!horizontal) { target = this->height(); } int index = listValue.indexOf(currentValue); //当右移偏移量大于比例且当前值不是第一个则索引-1 if (offset >= target / percent && index > 0) { pressedPos += target / percent; offset -= target / percent; index -= 1; } //当左移偏移量小于比例且当前值不是末一个则索引+1 if (offset <= -target / percent && index < count - 1) { pressedPos -= target / percent; offset += target / percent; index += 1; } currentIndex = index; currentValue = listValue.at(index); //绘制背景 drawBg(&painter); //绘制线条 drawLine(&painter); //绘制中间值 painter.setPen(textColor); drawText(&painter, index, offset); painter.setPen(foreground); //绘制左侧值 if (index != 0) { drawText(&painter, index - 1, offset - target / percent); } //绘制右侧值 if (index != count - 1) { drawText(&painter, index + 1, offset + target / percent); } } void Tumbler::drawBg(QPainter *painter) { painter->save(); painter->setPen(Qt::NoPen); painter->setBrush(background); painter->drawRect(rect()); painter->restore(); } void Tumbler::drawLine(QPainter *painter) { //上下部分偏移量 int offset = 10; int width = this->width(); int height = this->height(); painter->save(); painter->setBrush(Qt::NoBrush); QPen pen; pen.setWidth(3); pen.setColor(lineColor); pen.setCapStyle(Qt::RoundCap); painter->setPen(pen); //每次同时存在三个元素 if (horizontal) { painter->drawLine(width / 3 * 1, offset, width / 3 * 1, height - offset); painter->drawLine(width / 3 * 2, offset, width / 3 * 2, height - offset); } else { painter->drawLine(offset, height / 3 * 1, width - offset, height / 3 * 1); painter->drawLine(offset, height / 3 * 2, width - offset, height / 3 * 2); } painter->restore(); } void Tumbler::drawText(QPainter *painter, int index, int offset) { painter->save(); int width = this->width(); int height = this->height(); QString strValue = listValue.at(index); int target = width; if (!horizontal) { target = height; } QFont font = painter->font(); font.setPixelSize((target - qAbs(offset)) / 8); painter->setFont(font); if (horizontal) { int textWidth = painter->fontMetrics().width(strValue); int initX = width / 2 + offset - textWidth / 2; painter->drawText(QRect(initX, 0, textWidth, height), Qt::AlignCenter, strValue); //计算最后中间值停留的起始坐标,以便鼠标松开时矫正居中 if (index == currentIndex) { currentPos = initX; } } else { int textHeight = painter->fontMetrics().height(); int initY = height / 2 + offset - textHeight / 2; painter->drawText(QRect(0, initY, width, textHeight), Qt::AlignCenter, strValue); //计算最后中间值停留的起始坐标,以便鼠标松开时矫正居中 if (index == currentIndex) { currentPos = initY; } } painter->restore(); } void Tumbler::checkPosition() { int target = this->width(); if (!horizontal) { target = this->height(); } //左右滑动样式,往左滑动时,offset为负数,当前值所在X轴坐标小于宽度的一半,则将当前值设置为下一个值 //左右滑动样式,往右滑动时,offset为正数,当前值所在X轴坐标大于宽度的一半,则将当前值设置为上一个值 //上下滑动样式,往上滑动时,offset为负数,当前值所在Y轴坐标小于高度的一半,则将当前值设置为下一个值 //上下滑动样式,往下滑动时,offset为正数,当前值所在Y轴坐标大于高度的一半,则将当前值设置为上一个值 if (offset < 0) { if (currentPos < target / 2) { offset = 0; setCurrentIndex(currentIndex + 1); } } else { if (currentPos > target / 2) { offset = 0; setCurrentIndex(currentIndex - 1); } } } QStringList Tumbler::getListValue() const { return this->listValue; } int Tumbler::getCurrentIndex() const { return this->currentIndex; } QString Tumbler::getCurrentValue() const { return this->currentValue; } bool Tumbler::getHorizontal() const { return this->horizontal; } QColor Tumbler::getForeground() const { return this->