NeteaseMusic/lyricwidget.cpp at master · ZivNice/NeteaseMusic · GitHub

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#include "lyricwidget.h"
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QDir>
#include <QSettings>
#include <QPainter>
#include <QStyleOption>
#include <QDebug>
#include <QApplication>
#include <QDesktopWidget>

LyricWidget::LyricWidget(QWidget *parent)
    : QWidget(parent),
      settings(QCoreApplication::organizationName(), QCoreApplication::applicationName())
{
    resize(700,100);
    isMouseOn = false;
    isMLBD = false;
    setAttribute(Qt::WA_TranslucentBackground,true);
    setWindowFlags(Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint | Qt::Tool | Qt::X11BypassWindowManagerHint);

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->setSpacing(0);
    vbox->setMargin(2);

    QHBoxLayout *hbox = new QHBoxLayout;
    hbox->addStretch();

    pushButton_set = new QPushButton;
    pushButton_set->setFixedSize(24,24);
    pushButton_set->setIcon(QIcon(":/icon/set.svg"));
    pushButton_set->setFocusPolicy(Qt::NoFocus);
    pushButton_set->setFlat(true);
    pushButton_set->setCursor(Qt::PointingHandCursor);
    hbox->addWidget(pushButton_set);

    pushButton_close = new QPushButton;
    pushButton_close->setFixedSize(24,24);
    pushButton_close->setIcon(QIcon(":/icon/close.svg"));
    pushButton_close->setFocusPolicy(Qt::NoFocus);
    pushButton_close->setFlat(true);
    pushButton_close->setCursor(Qt::PointingHandCursor);
    hbox->addWidget(pushButton_close);
    vbox->addLayout(hbox);

    vbox->addStretch();
    setLayout(vbox);

    pushButton_set->hide();
    pushButton_close->hide();
}

void LyricWidget::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        isMLBD = true;
        m_point = event->pos();
    }
}

void LyricWidget::mouseMoveEvent(QMouseEvent *event)
{
    if (isMLBD) {
        setCursor(Qt::ClosedHandCursor);
        move(event->pos() - m_point + pos());
    }
}

void LyricWidget::mouseReleaseEvent(QMouseEvent *event)
{
    Q_UNUSED(event);
    isMLBD = false;
    setCursor(Qt::ArrowCursor);
    settings.setValue("LyricX", x());
    settings.setValue("LyricY", y());
}

void LyricWidget::enterEvent(QEvent *event)
{
    Q_UNUSED(event);
    pushButton_close->setVisible(true);
    pushButton_set->setVisible(true);
    isMouseOn = true;
    update();
}

void LyricWidget::leaveEvent(QEvent *event)
{
    Q_UNUSED(event);
    pushButton_close->setVisible(false);
    pushButton_set->setVisible(false);
    isMouseOn = false;
    update();
}

void LyricWidget::paintEvent(QPaintEvent *event)
{
    // https://bbs.csdn.net/topics/350233731
    Q_UNUSED(event);
    QPainter p(this);
    p.setRenderHints(QPainter::Antialiasing);
    p.setPen(Qt::NoPen);
    // 鼠标悬停绘制透明背景
    if (isMouseOn) {
        p.setBrush(QColor(255,255,255,20));
        p.drawRect(rect());
    }

    // 自适应宽度
    QFontMetrics FM(font);
    if(FM.boundingRect(text).width() > width()){
        resize(FM.boundingRect(text).size() + QSize(20,30));
    }

    // 根据字体计算歌词宽度
    QRegion left(0, 30, FM.boundingRect(text).width()*lp, height());            //左边唱过的区域
    QRegion right(FM.boundingRect(text).width()*lp, 30, width(), height());     //右边未唱过的区域
    QPainterPath path;
    path.addText(0, height()-20, font, text);    //歌词文字作为路径
    p.setBrush(color_left);             //文字填充色
    p.setPen(QColor(Qt::black));        //文字边框色
    p.setClipRegion(left);              //设置栽剪区域为以唱部分,Painter只在其中绘图
    p.drawPath(path);                   //画出左边歌词
    p.setBrush(color_right);            //字体填充色
    //p.setPen(QColor(Qt::black));      //字体边框色
    p.setClipRegion(right);             //设置栽剪区域为右边未唱过的部分
    p.drawPath(path);                   //画右边未唱过的歌词
}