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https://gitee.com/spark-store-project/spark-store
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57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
#include "smoothscrollbar.h"
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#include <QWheelEvent>
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#include <QDebug>
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SmoothScrollBar::SmoothScrollBar(QWidget *parent) : QScrollBar(parent)
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{
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m_scrollAni = new QPropertyAnimation(this);
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m_scrollAni->setTargetObject(this);
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m_scrollAni->setPropertyName("value");
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m_scrollAni->setEasingCurve(QEasingCurve::OutQuint); // 设置动画曲线，在Qt文档中有详细的介绍
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m_scrollAni->setDuration(500); // 设置动画时间，数值越小播放越快
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m_targetValue_v = value(); // 将m_targetValue_v初始化
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}
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void SmoothScrollBar::setValue(int value)
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{
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m_scrollAni->stop(); // 停止现在的动画，防止出现冲突
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m_scrollAni->setStartValue(this->value()); // 设置动画滚动的初始值为当前位置
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m_scrollAni->setEndValue(value); // 设置动画的结束位置为目标值
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m_scrollAni->start(); // 开始动画
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}
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void SmoothScrollBar::scrollTop()
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{
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setValue(-m_targetValue_v); // 开始动画
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m_targetValue_v = 0;
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}
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void SmoothScrollBar::scroll(int value)
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{
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// 这里推荐评论区中大佬优化的写法
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if (m_targetValue_v - value >= 0)
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{
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m_targetValue_v -= value; // 将目标值和相对位置进行运算
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setValue(m_targetValue_v); // 开始动画
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}
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}
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void SmoothScrollBar::mousePressEvent(QMouseEvent *e)
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{
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// 当使用鼠标操作滚动条时，不会刷新m_targetValue_v的值，因而需要重写事件，对其进行刷新。
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m_scrollAni->stop();
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QScrollBar::mousePressEvent(e);
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m_targetValue_v = value();
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}
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void SmoothScrollBar::mouseReleaseEvent(QMouseEvent *e)
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{
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m_scrollAni->stop();
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QScrollBar::mouseReleaseEvent(e);
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m_targetValue_v = value();
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}
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void SmoothScrollBar::mouseMoveEvent(QMouseEvent *e)
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{
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m_scrollAni->stop();
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QScrollBar::mouseMoveEvent(e);
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m_targetValue_v = value();
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}
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