添加qt相关内容
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134
qt/demo/CVlcKit.cpp
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134
qt/demo/CVlcKit.cpp
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//
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// Created by Administrator on 2023-09-17.
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//
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#include "CVlcKit.h"
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CVlcKit::CVlcKit() = default;
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CVlcKit::~CVlcKit()
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{
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libvlc_media_player_release(m_pMediaPlayer);
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libvlc_release(m_pInstance);
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}
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libvlc_media_player_t *CVlcKit::getPlayerPoint() const {
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return m_pMediaPlayer;
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}
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bool CVlcKit::InitVLC() {
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m_pInstance = libvlc_new(0, nullptr);
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if (!m_pInstance) {
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m_szError = u8"libvlc new failed!";
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return false;
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}
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m_pMediaPlayer = libvlc_media_player_new(m_pInstance);
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if (!m_pMediaPlayer) {
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libvlc_release(m_pInstance);
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m_szError = u8"libvlc_media_player_new failed!";
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return false;
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}
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m_event = libvlc_media_player_event_manager(m_pMediaPlayer);
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libvlc_event_attach(m_event, libvlc_MediaPlayerPositionChanged, vlc_call, this);
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libvlc_event_attach(m_event, libvlc_MediaPlayerAudioVolume, vlc_call, this);
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return true;
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}
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void CVlcKit::vlc_call(const struct libvlc_event_t *p_event, void *p_data) {
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auto* pThis = static_cast<CVlcKit*>(p_data);
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if (!pThis) {
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return;
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}
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switch (p_event->type) {
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case libvlc_MediaPlayerPositionChanged:
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{
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float pos = libvlc_media_player_get_position(pThis->m_pMediaPlayer);
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emit pThis->sigSetTimeSlider(static_cast<int>(pos * 100));
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long long current = libvlc_media_player_get_time(pThis->m_pMediaPlayer) / 1000;
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emit pThis->sigSetStringTime(current);
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break;
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}
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case libvlc_MediaPlayerAudioVolume:
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{
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int vol = libvlc_audio_get_volume(pThis->m_pMediaPlayer);
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emit pThis->sigSetVolumeSlider(vol);
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break;
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}
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default:
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break;
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}
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}
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void CVlcKit::stopVideo() {
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if (!m_pMediaPlayer) {
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return;
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}
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if (libvlc_media_player_get_state(m_pMediaPlayer) == libvlc_state_t::libvlc_Playing) {
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libvlc_media_player_stop(m_pMediaPlayer);
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}
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}
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void CVlcKit::pauseVideo() {
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if (!m_pMediaPlayer) {
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return;
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}
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if (libvlc_media_player_get_state(m_pMediaPlayer) == libvlc_state_t::libvlc_Playing) {
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libvlc_media_player_pause(m_pMediaPlayer);
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}
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}
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void CVlcKit::playVideo() {
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if (!m_pMediaPlayer) {
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return;
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}
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if (libvlc_media_player_get_state(m_pMediaPlayer) == libvlc_state_t::libvlc_Paused
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|| libvlc_media_player_get_state(m_pMediaPlayer) == libvlc_state_t::libvlc_Stopped) {
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libvlc_media_player_play(m_pMediaPlayer);
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}
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}
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bool CVlcKit::openVideo(const char* path, void* pWindow) {
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// 设置路径
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m_pMedia = libvlc_media_new_path(m_pInstance, path);
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if (!m_pMedia) {
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m_szError = u8"libvlc_media_new_path failed!";
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return false;
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}
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// 解析media
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libvlc_media_parse(m_pMedia);
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// 获取总时长 (ms)
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m_totalSec = libvlc_media_get_duration(m_pMedia);
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emit sigSetTotalSecond(m_totalSec / 1000);
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// 设置media
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libvlc_media_player_set_media(m_pMediaPlayer, m_pMedia);
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// 设置播放窗口句柄
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libvlc_media_player_set_hwnd(m_pMediaPlayer, pWindow);
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// 释放media
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libvlc_media_release(m_pMedia);
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m_pMedia = nullptr;
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// 播放视频
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libvlc_media_player_play(m_pMediaPlayer);
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return true;
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}
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std::string CVlcKit::getLastError() const {
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return m_szError;
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}
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void CVlcKit::setPlayPostion(float pos) {
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if (!m_pMediaPlayer) {
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return ;
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}
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libvlc_media_player_set_position(m_pMediaPlayer, static_cast<float >(pos / 100.0));
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}
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void CVlcKit::setVolume(int vol) {
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if (!m_pMediaPlayer) {
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return ;
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}
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libvlc_audio_set_volume(m_pMediaPlayer, vol);
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}
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52
qt/demo/CVlcKit.h
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52
qt/demo/CVlcKit.h
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//
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// Created by Administrator on 2023-09-17.
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//
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#ifndef VLCPLAYER_CVLCKIT_H
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#define VLCPLAYER_CVLCKIT_H
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#ifdef _WIN32
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#include <basetsd.h>
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typedef SSIZE_T ssize_t;
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#endif
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#include <QObject>
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#include <vlc/vlc.h>
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#include <string>
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class CVlcKit : public QObject
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{
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Q_OBJECT
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public:
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CVlcKit();
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~CVlcKit() override;
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public:
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bool InitVLC();
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[[nodiscard]] std::string getLastError() const;
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[[nodiscard]] libvlc_media_player_t* getPlayerPoint() const;
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public:
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void pauseVideo();
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void playVideo();
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void stopVideo();
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bool openVideo(const char* path, void* pWindow);
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void setPlayPostion(float pos);
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void setVolume(int vol);
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signals:
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void sigSetTimeSlider(int value);
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void sigSetVolumeSlider(int value);
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void sigSetStringTime(long long value);
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void sigSetTotalSecond(long long value);
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private:
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static void vlc_call( const struct libvlc_event_t *p_event, void *p_data );
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private:
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libvlc_instance_t* m_pInstance{};
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libvlc_media_player_t* m_pMediaPlayer{};
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libvlc_media_t* m_pMedia{};
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libvlc_event_manager_t* m_event{};
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libvlc_time_t m_totalSec = -1;
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std::string m_szError;
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};
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#endif //VLCPLAYER_CVLCKIT_H
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167
qt/qt-knowledge.txt
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167
qt/qt-knowledge.txt
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1.使用信号槽发送结构体信息，使用 qRegisterMetaType 注册一下。
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qRegisterMetaType<SParam>("SParam");
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2.sendParamValue 尽管设置成了 const reference，但是还会有一次构造
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因为 Qt 一下两个原因:
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1.线程安全性：Qt 的信号槽机制支持多线程，在多线程环境中，如果参数是引用，可能会引发线程安全问题。
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2.松耦合性：通过传值而不是引用，信号发送方和接收方可以更独立，不必担心在信号槽连接时传递的对象是否仍然有效。
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1.Qt的三个窗口类的区别
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(1)QMainWindow：包含菜单栏、工具栏、状态栏。
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(2)QWidget：普通窗口、大部分窗口要做成无边框的，这个使用较多。
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(3)QDialog：对话框，常用于做登录窗口、弹出窗口。
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2.类似保存上次访问信息这存储
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(1)使用QSettings
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示例：ini, /LastPath/path
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(2)一些常用的位置在 QStandardPaths::writableLocation(enum);
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3.信号
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signals: void xxx(int value); --> emit xxx(nValue);
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private slots: void yyy();
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4.子线程无法直接修改UI，需要使用信号处理。
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5.在VS中写QT时开启cmd窗口：
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项目--属性--链接器--系统--子系统--控制台 (/SUBSYSTEM:CONSOLE)
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6.信号重载：
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(1)使用 Qt4 的写法
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(2)Qt5 的写法，参数二 => QOverlaod<int>::of(xx)
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7.moc全称是Meta-Object Compiler（元对象编译器）
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moc -> 分析C++(若有Q_OBJECT) -> moc_xx.cpp(包含QOBJECT实现)
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--> 进入编译(预处理器之前，与源文件一起编译而不是替换)
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可以理解为：moc把Qt中不是C++的关键字解析让其认识。
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8.界面布局
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(1)设定min和max就是固定
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(2)配合弹簧布局
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(3)无边框：setWindowFlags(Qt::FramelessWindowHint)
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(4)任务栏单机隐藏显示 Qt::WindowMinMaxButtonsHint
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(5)Layout:
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setMargin: 与边界间隙。
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setSpacing: 与相邻空间间隙（默认大概是7）。
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addSpacing: 在 setSpacing 基础上加减。
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addStretch: 添加一个 QSpacerItem
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(6)QSplitter分裂器布局
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setOpaqueResize(false): 鼠标松开才变换。
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(7)全局setLayout如果不清除的话仅第一次生效。
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(8)清空布局内的所有元素：
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QLayoutItem* pChild; layout = this->layout();
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while((pChild = layout->takeAt(0)) != 0) if (pChild->widget()) xx->setParent(nullptr) delete;
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(9)Widget也可以作为一个容器用于布局。
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(10) resize 可以设定首次启动时的界面大小。
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9.QSS相关
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(1)给QPushButton设置背景图：
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QPushButton {
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background-image: url(:/resource/xx.png);
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border: none // 无边框;
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QPushButton::hover {
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background-color: rgb(192, 192, 192); // 鼠标悬浮时
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}
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}
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(2)QTabWidget
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QTabWidget::pane {
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border-top: 1px solid #EAEAEA; // 上边框
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position: absolute;
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top: -0.1px;
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}
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QTabBar::tab {
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width: 100px;
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height: 32px;
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font-size: 16px;
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font-family: Microsoft YaHei;
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font-weight: 400;
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background: #FFFFFF;
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border: 2px solid #FFFFFF;
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border-bottom-color: #FFFFFF;
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border-top-left-radius: 4px;
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border-top-right-radium: 4px;
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padding: 2px;
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}
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QTabBar::tab:selected {
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color: #333333;
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border-color: #FFFFFF;
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border-bottom-color: #4BA4F2;
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}
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QTabBar::tab:!selected {
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color: #B2B2B2;
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border-color: #FFFFFF;
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border-bottom-color: #4BA4F2;
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}
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10.基本控件简记
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(1)QToolButton可以图片文字一起显示
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QToolButton->setIcon, setIconSize, setToolButtonStyle
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(2)QLineEidt
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setPlacceholderText: 未填写内容的提示信息
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setEchoMode: 显示形式，比如密码形式。
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(3)右键菜单, menu->exec(QCursor::pos())
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setContextMenuPolicy(Qt::CustomContextMenu);
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void contextMenuEvent(QContextMenuEvent* event) override;
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(4)QMenu可以添加QAction
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(5)QTableWiget可以直接insert Wiget作为一个新的tab页。
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setTabPostion: 位置
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setTabShape: 形状
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setMovable: 可移动
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(6)QListWidget
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Item项也可以是一个widget。
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ListeItem 怎么添加右键菜单：
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①必须设置菜单策略 listWidget->setContextMenuPolicy(Qt::CustomContextMenu);
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connect(xxListwidget, &QListWidget::customContextMenuRequested, this, xxx);
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图标模式：setViewMode
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焦点：setFocusPolicy(Qt::NoFocus)
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(7)QScrollArea
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setFrameShape(QFrame::NoFrame)
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setHorizontalScrollBarPolicy()
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11.无边框窗口
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Qt很多问题都可以从QWidget中找到答案，学习Qt大部分就是在与QWidget打交道。
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(1)无边框界面移动和拉伸、大小改变
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重写
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mousePressEvent
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mouseMoveEvent
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this->pos() 窗口左上角相对桌面位置
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event->pos() 鼠标相对exe位置
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event->globalPos() 鼠标相对桌面位置
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使用 this->move(pos)
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重写nativeEvent()
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setAttributte(Qt::WA_Hover)防止鼠标边无法选中。
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(2)自定义标题栏(自己布局)
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setAttribute(Qt::WA_StyleBackground)禁止父窗口影响子窗口样式。
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qobject_cast<QPushButton*>(sender())可以获取发送者。
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(3)实现窗口阴影
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需要两层窗口
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$设置窗口透明 this->setAttribute(Qt::WA_TranslucentBackground, true);
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$设置无边框 Qt::Windows
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$给顶层widget设置背景颜色，不然看不见。
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Qt窗口阴影类：QGraphicsDropShadowEffect -> shadow
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设置阴影距离: setOffset
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设置阴影颜色: setColor
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设置区域: setBlurRadius
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给顶层widget设置阴影：setGraphicsEffect(shadow);
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相当于是：将实际窗口外包了一层，外面层用于透明。
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(4)圆角窗口(也要透明，无边框)
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$1: 重写paintEvent
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing); // 抗锯齿
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painter.setBrush(QBrush(QColor(255, 255, 255));
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painter.setPen(Qt::transparent);
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auto rect = this->rect();
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painter.drawRoundedRect(rect, 15, 15); // 可以画圆
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$2: 使用 qss
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this->setStyleSheet("QWidget{background-color:gray; border-radius: 30px}");
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// 窗口透明后，需要重写该方法
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void paintEvent(xxx)
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{
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QStyleOption opt;
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opt.init(this);
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QPainter p(this);
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style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
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QWidget::paintEvent(event);
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}
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12.QSS样式表(Qt Style Sheet) 类似css，但是没有css强大。
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13.Qt CEF, QCefView
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