完整的工程目录提交

环境：Qt5 （Qt Creator 4.8.2 + Qt 5.9.8 MinGW 32bit）

.gitignore

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+# C++ objects and libs
+*.slo
+*.lo
+*.o
+*.a
+*.la
+*.lai
+*.so
+*.so.*
+*.dll
+*.dylib
+
+# Qt-es
+object_script.*.Release
+object_script.*.Debug
+*_plugin_import.cpp
+/.qmake.cache
+/.qmake.stash
+*.pro.user
+*.pro.user.*
+*.qbs.user
+*.qbs.user.*
+*.moc
+moc_*.cpp
+moc_*.h
+qrc_*.cpp
+ui_*.h
+*.qmlc
+*.jsc
+Makefile*
+*build-*
+*.qm
+*.prl
+
+# Qt unit tests
+target_wrapper.*
+
+# QtCreator
+*.autosave
+
+# QtCreator Qml
+*.qmlproject.user
+*.qmlproject.user.*
+
+# QtCreator CMake
+CMakeLists.txt.user*
+
+# QtCreator 4.8< compilation database 
+compile_commands.json
+
+# QtCreator local machine specific files for imported projects
+*creator.user*

LightMusicPlayer/LightMusicPlayer/LightMusicPlayer.pro

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2019-12-11T10:44:34
+#
+#-------------------------------------------------
+
+QT       += core gui sql
+QT       += multimedia
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = LightMusicPlayer
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which has been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+CONFIG += c++11
+
+SOURCES += \
+        main.cpp \
+    Music.cpp \
+    MainWidget.cpp \
+    MusicListWidget.cpp \
+    MusicList.cpp \
+    MusicListDialog.cpp \
+    LyricWidget.cpp
+
+HEADERS += \
+    Music.h \
+    myQSS.h \
+    MainWidget.h \
+    MusicListWidget.h \
+    MusicList.h \
+    MusicListDialog.h \
+    LyricWidget.h
+
+FORMS += \
+    MusicListDialog.ui \
+    mainWidget.ui \
+    LyricWidget.ui
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
+
+RESOURCES += \
+    imagefile.qrc
+
+
+RC_ICONS = LightMusicPlayer.ico

LightMusicPlayer/LightMusicPlayer/LyricWidget.cpp

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+#include "LyricWidget.h"
+#include "ui_LyricWidget.h"
+
+#include <algorithm>
+#include <QTextCodec>
+
+LyricWidget::LyricWidget(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::LyricWidget)
+{
+    ui->setupUi(this);
+    clear();//清空用于排版时的测试内容(.ui文件中)
+}
+
+LyricWidget::~LyricWidget()
+{
+    delete ui;
+}
+
+
+//重载比较（歌词按时间排序）
+bool operator <(const LyricLine& A, const LyricLine& B){
+    return A.time<B.time;
+}
+
+bool LyricWidget::process(QString filePath)
+{    
+    QFile lyricFile(filePath);
+    lyricFile.open(QFile::ReadOnly);
+    QString content(QString::fromLocal8Bit(lyricFile.readAll()));
+    lyricFile.close();
+
+    //先清空歌词
+    lines.clear();
+
+    const QRegExp rx("\\[(\\d+):(\\d+(\\.\\d+)?)\\]"); //用来查找时间标签的正则表达式
+
+    // 步骤1
+    int pos = rx.indexIn(content);
+    if (pos == -1) {
+        return false;
+    }
+    else {
+        int lastPos;
+        QList<int> timeLabels;
+        do {
+            // 步骤2
+            timeLabels << (rx.cap(1).toInt() * 60 + rx.cap(2).toDouble()) * 1000;
+            lastPos = pos + rx.matchedLength();
+            pos = rx.indexIn(content, lastPos);
+            if (pos == -1) {
+                QString text = content.mid(lastPos).trimmed();
+                foreach (const int& time, timeLabels)
+                    lines.push_back(LyricLine(time, text));
+                break;
+            }
+            // 步骤3
+            QString text = content.mid(lastPos, pos - lastPos);
+            if (!text.isEmpty()) {
+                foreach (const int& time, timeLabels)
+                    lines.push_back(LyricLine(time, text.trimmed()));
+                timeLabels.clear();
+            }
+        }
+        while (true);
+        // 步骤4
+        stable_sort(lines.begin(), lines.end());
+    }
+    if (lines.size()) {
+        return true;
+    }
+    return false;
+}
+
+int LyricWidget::getIndex(qint64 position)
+{
+    if(!lines.size()){
+        return -1;
+    }else{
+        if(lines[0].time>=position){
+            return 0;
+        }
+    }
+    int i=1;
+    for(i=1;i<lines.size();i++){
+        if(lines[i-1].time<position && lines[i].time>=position){
+            return i-1;
+        }
+    }
+    return lines.size()-1;
+}
+
+void LyricWidget::show(qint64 position)
+{
+    int index=getIndex(position);
+    if(index==-1){
+        ui->label_3i->setText("");
+        ui->label_2i->setText("");
+        ui->label_1i->setText("");
+        ui->label_i->setText(u8"当前歌曲无歌词");
+        ui->label_i1->setText("");
+        ui->label_i2->setText("");
+        ui->label_i3->setText("");
+    }else{
+        ui->label_3i->setText(getLyricText(index-3));
+        ui->label_2i->setText(getLyricText(index-2));
+        ui->label_1i->setText(getLyricText(index-1));
+        ui->label_i->setText(getLyricText(index));
+        ui->label_i1->setText(getLyricText(index+1));
+        ui->label_i2->setText(getLyricText(index+2));
+        ui->label_i3->setText(getLyricText(index+3));
+    }
+}
+
+QString LyricWidget::getLyricText(int index)
+{
+    if(index<0 || index>=lines.size()){
+        return "";
+    }else{
+        return lines[index].text;
+    }
+}
+
+void LyricWidget::clear()
+{
+    ui->label_3i->setText("");
+    ui->label_2i->setText("");
+    ui->label_1i->setText("");
+    ui->label_i->setText("");
+    ui->label_i1->setText("");
+    ui->label_i2->setText("");
+    ui->label_i3->setText("");
+}

LightMusicPlayer/LightMusicPlayer/LyricWidget.h

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+#ifndef LYRICWIDGET_H
+#define LYRICWIDGET_H
+
+#include<QWidget>
+#include<QLabel>
+#include<QFile>
+#include<vector>
+using namespace std;
+
+//表示一行歌词（一个时间点+对应的歌词文本）
+class LyricLine
+{
+public:
+    qint64 time;
+    QString text;
+    LyricLine(qint64 time, QString text):time(time), text(text){}    
+};
+
+bool operator <(const LyricLine& A, const LyricLine& B);
+
+namespace Ui {
+class LyricWidget;
+}
+
+class LyricWidget : public QWidget
+{
+    Q_OBJECT
+
+    //储存所有歌词
+    vector<LyricLine> lines;    
+public:
+    explicit LyricWidget(QWidget *parent = nullptr);
+    ~LyricWidget();
+
+    //将歌词文件的内容处理为歌词结构的QList
+    bool process(QString filePath); 
+    //根据时间找到对应位置的歌词
+    int getIndex(qint64 position);
+    //显示当前播放进度的歌词
+    void show(qint64 position);
+    //根据下标获得歌词内容
+    QString getLyricText(int index);
+    //清空歌词Label
+    void clear();
+
+private:
+    Ui::LyricWidget *ui;
+};
+
+#endif // LYRICWIDGET_H