Qt/C++编写视频监控系统之自定义音柱显示功能

#include "frmvideowidgetvolume.h"
#include "ui_frmvideowidgetvolume.h"
#include "qthelper.h"
#include "videowidgetx.h"
#include "barvolume.h"
frmVideoWidgetVolume::frmVideoWidgetVolume(int position, VideoWidget *videoWidget, QWidget *parent) : QWidget(parent), ui(new Ui::frmVideoWidgetVolume)
{
    ui->setupUi(this);
    this->position = position;
    this->videoWidget = videoWidget;
    bgText = videoWidget->getBgText();
    isVertical = true;
    if (position == 2 || position == 4) {
        isVertical = false;
    }
    //实例化音柱控件并设置方向
    leftVolume = new BarVolume;
    rightVolume = new BarVolume;
    leftVolume->setVertical(isVertical);
    rightVolume->setVertical(isVertical);
    //实例化布局并设置边距间距
    QGridLayout *layout = new QGridLayout(this);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(3);
    //将音柱控件和视频控件插入到对应位置/可以自行拓展各种布局
    if (position == 1) {
        layout->addWidget(leftVolume, 0, 0);
        layout->addWidget(rightVolume, 0, 1);
        layout->addWidget(videoWidget, 0, 2);
    } else if (position == 2) {
        layout->addWidget(leftVolume, 0, 0);
        layout->addWidget(rightVolume, 1, 0);
        layout->addWidget(videoWidget, 2, 0);
    } else if (position == 3) {
        layout->addWidget(videoWidget, 0, 0);
        layout->addWidget(leftVolume, 0, 1);
        layout->addWidget(rightVolume, 0, 2);
    } else if (position == 4) {
        layout->addWidget(videoWidget, 0, 0);
        layout->addWidget(leftVolume, 1, 0);
        layout->addWidget(rightVolume, 2, 0);
    } else if (position == 5) {
        layout->addWidget(leftVolume, 0, 0);
        layout->addWidget(videoWidget, 0, 1);
        layout->addWidget(rightVolume, 0, 2);
    } else if (position == 6) {
        //实例化弹簧控件
        spaceLeft = new QSpacerItem(0, 0, QSizePolicy::Expanding, QSizePolicy::Preferred);
        spaceCenter = new QSpacerItem(0, 0, QSizePolicy::Expanding, QSizePolicy::Preferred);
        spaceRight = new QSpacerItem(0, 0, QSizePolicy::Expanding, QSizePolicy::Preferred);
        //实例化布局并插入控件
        hlayout = new QHBoxLayout;
        hlayout->addWidget(leftVolume);
        hlayout->addItem(spaceCenter);
        hlayout->addWidget(rightVolume);
        videoWidget->setLayout(hlayout);
        layout->addWidget(videoWidget);
    }
    //关联音频振幅信号
    connect(videoWidget, SIGNAL(sig_receiveLevel(qreal, qreal)), this, SLOT(receiveLevel(qreal, qreal)));
    //打开和关闭后需要清空下(有可能残留上一次的数据)
    connect(videoWidget, SIGNAL(sig_receivePlayStart(int)), this, SLOT(reset()));
    connect(videoWidget, SIGNAL(sig_receivePlayFinsh()), this, SLOT(reset()));
    //音柱窗体参数变化后需要重置
    connect(AppEvent::Instance(), SIGNAL(changeVolumeWidget()), this, SLOT(reset()));
}
frmVideoWidgetVolume::~frmVideoWidgetVolume()
{
    delete ui;
}
void frmVideoWidgetVolume::resizeEvent(QResizeEvent *)
{
    int width = this->width();
    int height = this->height();
    //根据宽度动态设置音量条宽度或者高度/也可以设置成固定值
    int size = (isVertical ? width : height);
    if (AppConfig::VolumeSize == 0) {
        size = size * 0.05;
        size = (size > 20 ? 20 : size);
    } else {
        size = AppConfig::VolumeSize;
    }
    if (isVertical) {
        leftVolume->setMaximumWidth(size);
        rightVolume->setMaximumWidth(size);
    } else {
        leftVolume->setMaximumHeight(size);
        rightVolume->setMaximumHeight(size);
    }
    //根据高度动态设置音量格子数量(一般高度越小格子数越少)
    int step = height / (position == 6 ? 10 : 6);
    leftVolume->setStep(step);
    rightVolume->setStep(step);
    //根据音柱位置摆放控件
    if (position == 6) {
        if (videoWidget->getIsRunning() && videoWidget->getVideoThread()->getIsOk()) {
            leftVolume->show();
            rightVolume->show();
            //根据悬浮条的位置留出空余的地方
            int offset = 35;
            if (AppConfig::BannerPosition == 1) {
                hlayout->setContentsMargins(9, 9, 9, offset);
            } else if (AppConfig::BannerPosition == 2) {
                hlayout->setContentsMargins(offset, 9, 9, 9);
            } else if (AppConfig::BannerPosition == 3) {
                hlayout->setContentsMargins(9, 9, offset, 9);
            } else {
                hlayout->setContentsMargins(9, offset, 9, 9);
            }
            //先把布局中的挨个移除
            hlayout->removeItem(spaceLeft);
            hlayout->removeItem(spaceCenter);
            hlayout->removeItem(spaceRight);
            hlayout->removeWidget(leftVolume);
            hlayout->removeWidget(rightVolume);
            //纯音频需要占用比较大的面积
            if (videoWidget->getOnlyAudio()) {
                videoWidget->setBgText("");
                size = width / 4;
                leftVolume->setMaximumWidth(size);
                rightVolume->setMaximumWidth(size);
                leftVolume->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Ignored);
                rightVolume->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Ignored);
                hlayout->addItem(spaceLeft);
                hlayout->addWidget(leftVolume);
                hlayout->addWidget(rightVolume);
                hlayout->addItem(spaceRight);
            } else {
                leftVolume->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Ignored);
                rightVolume->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Ignored);
                hlayout->addWidget(leftVolume);
                hlayout->addItem(spaceCenter);
                hlayout->addWidget(rightVolume);
            }
        } else {
            leftVolume->hide();
            rightVolume->hide();
            videoWidget->setBgText(bgText);
        }
    }
}
void frmVideoWidgetVolume::reset()
{
    leftVolume->clear();
    rightVolume->clear();
    this->resizeEvent(NULL);
}
void frmVideoWidgetVolume::receiveLevel(qreal leftLevel, qreal rightLevel)
{
    leftVolume->setValue(leftLevel);
    rightVolume->setValue(rightLevel);
}