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c 网站开发案例详解,电商平台怎么推广,WordPress点击文章显示404,重庆产品推广类网站前言使用Qt5.15.2，QML实现简单的歌词动态播放效果。效果图如下： 注：这里只是为了演示播放效果，并未真正加载音频进行播放。可以在此基础上进行扩展。正文关键代码 QML部分 import QtQuick 2.15 import QtQuick.Window 2.…

前言

使用Qt5.15.2，QML实现简单的歌词动态播放效果。
效果图如下：
在这里插入图片描述
注：这里只是为了演示播放效果，并未真正加载音频进行播放。可以在此基础上进行扩展。

正文

关键代码
QML部分

import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15
import LyricsPlayback 1.0Window {id: mainWindowwidth: 800height: 500visible: truetitle: "歌词播放器"// 设置窗口透明color: "transparent"flags: Qt.Window | Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.WA_TranslucentBackground// 自定义播放位置属性property int customPosition: 0// 播放状态属性property bool isPlaying: falseItem{anchors.fill: parent// 允许拖动窗口MouseArea {anchors.fill: parentproperty point clickPos: "0,0"onPressed: {clickPos = Qt.point(mouse.x, mouse.y)}onPositionChanged: {if (pressed) {var delta = Qt.point(mouse.x - clickPos.x, mouse.y - clickPos.y)mainWindow.x += delta.xmainWindow.y += delta.y}}}// 歌词模型LyricsModel {id: lyricsModel}// 不再使用MediaPlayer组件// 主布局Rectangle {anchors.fill: parentcolor: "#80000000" // 半透明黑色背景radius: 10ColumnLayout {anchors.fill: parentanchors.margins: 10spacing: 10// 歌词显示区域ListView {id: lyricsViewLayout.fillWidth: trueLayout.fillHeight: truemodel: lyricsModelclip: truespacing: 5highlightFollowsCurrentItem: truehighlightMoveDuration: 200// 自动滚动到当前歌词onCountChanged: {if (lyricsModel.currentIndex >= 0) {positionViewAtIndex(lyricsModel.currentIndex, ListView.Center)}}Connections {target: lyricsModelfunction onCurrentIndexChanged() {if (lyricsModel.currentIndex >= 0) {lyricsView.positionViewAtIndex(lyricsModel.currentIndex, ListView.Center)}}}delegate: Item {width: lyricsView.widthheight: 40Text {id: lyricTextanchors.centerIn: parentwidth: parent.widthhorizontalAlignment: Text.AlignHCentertext: model.textfont.pixelSize: model.isCurrent ? 24 : 18font.bold: model.isCurrentcolor: model.isCurrent ? Qt.rgba(1, 1, 1, 1) : "#80FFFFFF" // 当前行为白色，其他为半透明白色elide: Text.ElideRight// 当前播放行的渐变效果Rectangle {visible: model.isCurrentanchors.left: parent.leftanchors.top: parent.topanchors.bottom: parent.bottomwidth: parent.width * lyricsModel.progresscolor: "transparent"clip: trueText {anchors.left: parent.leftanchors.top: parent.toptext: model.textfont.pixelSize: 24font.bold: truecolor: "#FF4081" // 高亮颜色width: lyricText.widthhorizontalAlignment: Text.AlignHCenterelide: Text.ElideRight}}}}}// 控制栏RowLayout {Layout.fillWidth: trueheight: 40spacing: 10Button {text: "加载示例歌词"onClicked: {lyricsModel.loadSampleLyrics()isPlaying = falseplayTimer.stop()customPosition = 0lyricsModel.position = 0}}Button {text: isPlaying ? "暂停" : "播放"onClicked: {if (isPlaying) {isPlaying = falseplayTimer.stop()} else {isPlaying = trueplayTimer.start()}}}Button {text: "退出"onClicked: {Qt.quit()}}Slider {Layout.fillWidth: truefrom: 0to: 40000 // 40秒value: customPositiononMoved: {customPosition = valuelyricsModel.position = value}}}}}// 由于没有实际的音频文件，使用定时器模拟播放进度Timer {id: playTimerinterval: 100repeat: truerunning: falseonTriggered: {if (customPosition < 40000) { // 40秒customPosition += 100// 更新歌词模型的位置lyricsModel.position = customPosition} else {stop()customPosition = 0lyricsModel.position = 0}}}Component.onCompleted: {lyricsModel.loadSampleLyrics()}}
}

通过设置歌词格式和时间来判定播放进度

void LyricsModel::setPosition(qint64 position)
{if (m_position != position) {m_position = position;emit positionChanged();// 更新当前歌词索引updateCurrentIndex();// 如果在当前歌词行内，更新进度if (m_currentIndex >= 0 && m_currentIndex < m_lyrics.size()) {emit progressChanged();}}
}QString LyricsModel::lyricsText() const
{return m_lyricsText;
}void LyricsModel::setLyricsText(const QString &text)
{if (m_lyricsText != text) {m_lyricsText = text;emit lyricsTextChanged();// 解析歌词beginResetModel();m_lyrics.clear();if (m_parser.parseLyrics(text)) {QMap<qint64, QString> parsedLyrics = m_parser.getLyrics();QMapIterator<qint64, QString> it(parsedLyrics);while (it.hasNext()) {it.next();LyricLine line;line.time = it.key();line.text = it.value();m_lyrics.append(line);}}endResetModel();// 重置当前索引setCurrentIndex(-1);updateCurrentIndex();}
}qint64 LyricsModel::currentStartTime() const
{if (m_currentIndex >= 0 && m_currentIndex < m_lyrics.size()) {return m_lyrics.at(m_currentIndex).time;}return 0;
}qint64 LyricsModel::currentEndTime() const
{if (m_currentIndex >= 0 && m_currentIndex < m_lyrics.size() - 1) {return m_lyrics.at(m_currentIndex + 1).time;}return 0;
}qreal LyricsModel::progress() const
{if (m_currentIndex >= 0 && m_currentIndex < m_lyrics.size()) {qint64 startTime = m_lyrics.at(m_currentIndex).time;qint64 endTime;if (m_currentIndex < m_lyrics.size() - 1) {// 非最后一行，使用下一行的时间作为结束时间endTime = m_lyrics.at(m_currentIndex + 1).time;} else {// 最后一行，使用开始时间加上固定时长(4秒)作为结束时间endTime = startTime + 4000;}if (endTime > startTime) {if (m_position >= startTime) {if (m_position <= endTime) {// 在时间范围内，正常计算进度return static_cast<qreal>(m_position - startTime) / (endTime - startTime);} else {// 超过结束时间，显示100%进度return 1.0;}}}}return 0.0;
}void LyricsModel::updateCurrentIndex()
{// 查找当前时间对应的歌词行int newIndex = -1;for (int i = 0; i < m_lyrics.size() - 1; ++i) {if (m_position >= m_lyrics.at(i).time && m_position < m_lyrics.at(i + 1).time) {newIndex = i;break;}}// 处理最后一行歌词if (newIndex == -1 && !m_lyrics.isEmpty() && m_position >= m_lyrics.last().time) {newIndex = m_lyrics.size() - 1;}setCurrentIndex(newIndex);
}void LyricsModel::loadSampleLyrics()
{QString sampleLyrics = "[00:00.00]示例歌词 - 测试\n""[00:02.00]作词：测试\n""[00:04.00]作曲：测试\n""[00:06.00]\n""[00:08.00]这是第一行歌词\n""[00:12.00]这是第二行歌词示例\n""[00:16.00]这是第三行歌词演示文本\n""[00:20.00]这是第四行歌词测试内容\n""[00:24.00]这是第五行歌词展示效果\n""[00:28.00]这是最后一行歌词\n""[00:32.00]\n";setLyricsText(sampleLyrics);
}

歌词解析部分：

bool LyricsParser::parseLyrics(const QString &lyricsText)
{// 清空之前的歌词clear();// 按行分割歌词文本QStringList lines = lyricsText.split('\n');// 正则表达式匹配时间标签 [mm:ss.xx]QRegularExpression timeRegex("\\[(\\d+):(\\d+)\\.(\\d+)\\]");for (const QString &line : lines) {// 跳过空行if (line.trimmed().isEmpty()) {continue;}QString remainingLine = line;QRegularExpressionMatch match;int position = 0;// 查找所有时间标签while ((match = timeRegex.match(remainingLine, position)).hasMatch()) {int minutes = match.captured(1).toInt();int seconds = match.captured(2).toInt();int milliseconds = match.captured(3).toInt();// 计算总毫秒数qint64 timeMs = minutes * 60 * 1000 + seconds * 1000 + milliseconds * 10; // 通常LRC中的时间戳精度为百分之一秒position = match.capturedEnd();// 提取歌词文本（去除所有时间标签后的内容）QString lyricText = remainingLine;lyricText.remove(timeRegex);lyricText = lyricText.trimmed();if (!lyricText.isEmpty()) {m_lyrics.insert(timeMs, lyricText);}}}return !m_lyrics.isEmpty();
}