Qt开源作品15-视频监控画面

一、前言

视频监控系统在整个安防领域，已经做到了烂大街的程序，全国起码几百家公司做过类似的系统，当然这一方面的需求量也是非常旺盛的，各种定制化的需求越来越多，尤其是这几年借着人脸识别的东风，发展更加迅猛，人脸识别相关的技术和应用这几年处于风口浪尖，衍生了特别多的应用产品，各种人脸识别的产品遍地开花，刷脸门禁，车站机场人脸识别，刷脸取票等，但是其实大部分内行人士可能都比较绝望，外行感觉像看科幻片一样，老板们各种打鸡血，今天几个亿明天几个亿。

纵观Qt的应用场景领域，在国内，基本上在安防、航天船舶、教育、工业控制领域，占有比较大的比例，其实个人非常喜爱Qt的，从没见过如此完美的API封装，包括命名，最牛逼的就是跨平台特性，可以说完爆.NET的跨平台，甚至连那种几十兆的嵌入式linux版本都能运行，这就使得成本大大降低，提高了产品的丰富性。自从用了Qt以后，就再也不想用VC/VB/C#等。

视频监控画面在任何视频监控系统中是少不了的一个功能，基本上是需要1画面、4画面、6画面、8画面、9画面、16画面等，Qt提供的表格布局非常胜任这个工作，网上几乎没有看到qt做的最基础的视频监控画面分割的demo，今天特意花几分钟提取出来，开源放出来。欢迎大家多多点赞！现在还增加了25画面、36画面，里边的函数封装的很好，稍微加几行可以直接增加49画面等其他的。

二、代码思路

void VideoPanel::change_video(int index, int flag)
{
    int count = 0;
    int row = 0;
    int column = 0;

    for (int i = 0; i < videoCount; i++) {
        if (i >= index) {
            gridLayout->addWidget(widgets.at(i), row, column);
            widgets.at(i)->setVisible(true);

            count++;
            column++;
            if (column == flag) {
                row++;
                column = 0;
            }
        }

        if (count == (flag * flag)) {
            break;
        }
    }
}

void VideoPanel::change_video_4(int index)
{
    hide_video_all();
    change_video(index, 2);
}

void VideoPanel::change_video_6(int index)
{
    hide_video_all();
    if (index == 0) {
        gridLayout->addWidget(widgets.at(0), 0, 0, 2, 2);
        gridLayout->addWidget(widgets.at(1), 0, 2, 1, 1);
        gridLayout->addWidget(widgets.at(2), 1, 2, 1, 1);
        gridLayout->addWidget(widgets.at(3), 2, 2, 1, 1);
        gridLayout->addWidget(widgets.at(4), 2, 1, 1, 1);
        gridLayout->addWidget(widgets.at(5), 2, 0, 1, 1);

        for (int i = 0; i < 6; i++) {
            widgets.at(i)->setVisible(true);
        }
    } else if (index == 5) {
        gridLayout->addWidget(widgets.at(5), 0, 0, 2, 2);
        gridLayout->addWidget(widgets.at(6), 0, 2, 1, 1);
        gridLayout->addWidget(widgets.at(7), 1, 2, 1, 1);
        gridLayout->addWidget(widgets.at(8), 2, 2, 1, 1);
        gridLayout->addWidget(widgets.at(9), 2, 1, 1, 1);
        gridLayout->addWidget(widgets.at(10), 2, 0, 1, 1);

        for (int i = 5; i < 11; i++) {
            widgets.at(i)->setVisible(true);
        }
    } else if (index == 10) {
        gridLayout->addWidget(widgets.at(10), 0, 0, 2, 2);
        gridLayout->addWidget(widgets.at(11), 0, 2, 1, 1);
        gridLayout->addWidget(widgets.at(12), 1, 2, 1, 1);
        gridLayout->addWidget(widgets.at(13), 2, 2, 1, 1);
        gridLayout->addWidget(widgets.at(14), 2, 1, 1, 1);
        gridLayout->addWidget(widgets.at(15), 2, 0, 1, 1);

        for (int i = 10; i < 16; i++) {
            widgets.at(i)->setVisible(true);
        }
    }
}

void VideoPanel::change_video_8(int index)
{
    hide_video_all();
    if (index == 0) {
        gridLayout->addWidget(widgets.at(0), 0, 0, 3, 3);
        gridLayout->addWidget(widgets.at(1), 0, 3, 1, 1);
        gridLayout->addWidget(widgets.at(2), 1, 3, 1, 1);
        gridLayout->addWidget(widgets.at(3), 2, 3, 1, 1);
        gridLayout->addWidget(widgets.at(4), 3, 3, 1, 1);
        gridLayout->addWidget(widgets.at(5), 3, 2, 1, 1);
        gridLayout->addWidget(widgets.at(6), 3, 1, 1, 1);
        gridLayout->addWidget(widgets.at(7), 3, 0, 1, 1);

        for (int i = 0; i < 8; i++) {
            widgets.at(i)->setVisible(true);
        }
    } else if (index == 8) {
        gridLayout->addWidget(widgets.at(8), 0, 0, 3, 3);
        gridLayout->addWidget(widgets.at(9), 0, 3, 1, 1);
        gridLayout->addWidget(widgets.at(10), 1, 3, 1, 1);
        gridLayout->addWidget(widgets.at(11), 2, 3, 1, 1);
        gridLayout->addWidget(widgets.at(12), 3, 3, 1, 1);
        gridLayout->addWidget(widgets.at(13), 3, 2, 1, 1);
        gridLayout->addWidget(widgets.at(14), 3, 1, 1, 1);
        gridLayout->addWidget(widgets.at(15), 3, 0, 1, 1);

        for (int i = 8; i < 16; i++) {
            widgets.at(i)->setVisible(true);
        }
    }
}

void VideoPanel::change_video_9(int index)
{
    hide_video_all();
    change_video(index, 3);
}

void VideoPanel::change_video_13(int index)
{
    hide_video_all();
    if (index == 0) {
        gridLayout->addWidget(widgets.at(0), 0, 0, 1, 1);
        gridLayout->addWidget(widgets.at(1), 0, 1, 1, 1);
        gridLayout->addWidget(widgets.at(2), 0, 2, 1, 1);
        gridLayout->addWidget(widgets.at(3), 0, 3, 1, 1);
        gridLayout->addWidget(widgets.at(4), 1, 0, 1, 1);
        gridLayout->addWidget(widgets.at(5), 2, 0, 1, 1);
        gridLayout->addWidget(widgets.at(6), 1, 1, 2, 2);
        gridLayout->addWidget(widgets.at(7), 1, 3, 1, 1);
        gridLayout->addWidget(widgets.at(8), 2, 3, 1, 1);
        gridLayout->addWidget(widgets.at(9), 3, 0, 1, 1);
        gridLayout->addWidget(widgets.at(10), 3, 1, 1, 1);
        gridLayout->addWidget(widgets.at(11), 3, 2, 1, 1);
        gridLayout->addWidget(widgets.at(12), 3, 3, 1, 1);

        for (int i = 0; i < 13; i++) {
            widgets.at(i)->setVisible(true);
        }
    } else if (index == 3) {
        gridLayout->addWidget(widgets.at(3), 0, 0, 1, 1);
        gridLayout->addWidget(widgets.at(4), 0, 1, 1, 1);
        gridLayout->addWidget(widgets.at(5), 0, 2, 1, 1);
        gridLayout->addWidget(widgets.at(6), 0, 3, 1, 1);
        gridLayout->addWidget(widgets.at(7), 1, 0, 1, 1);
        gridLayout->addWidget(widgets.at(8), 2, 0, 1, 1);
        gridLayout->addWidget(widgets.at(9), 1, 1, 2, 2);
        gridLayout->addWidget(widgets.at(10), 1, 3, 1, 1);
        gridLayout->addWidget(widgets.at(11), 2, 3, 1, 1);
        gridLayout->addWidget(widgets.at(12), 3, 0, 1, 1);
        gridLayout->addWidget(widgets.at(13), 3, 1, 1, 1);
        gridLayout->addWidget(widgets.at(14), 3, 2, 1, 1);
        gridLayout->addWidget(widgets.at(15), 3, 3, 1, 1);

        for (int i = 3; i < 16; i++) {
            widgets.at(i)->setVisible(true);
        }
    }
}

void VideoPanel::change_video_16(int index)
{
    hide_video_all();
    change_video(index, 4);
}

void VideoPanel::change_video_25(int index)
{
    hide_video_all();
    change_video(index, 5);
}

void VideoPanel::change_video_36(int index)
{
    hide_video_all();
    change_video(index, 6);
}

void VideoPanel::change_video_64(int index)
{
    hide_video_all();
    change_video(index, 8);
}

三、效果图

四、开源主页

以上作品完整源码下载都在开源主页，会持续不断更新作品数量和质量，欢迎各位关注。

1. 国内站点：https://gitee.com/feiyangqingyun/QWidgetDemo
2. 国际站点：https://github.com/feiyangqingyun/QWidgetDemo
3. 个人主页：https://blog.csdn.net/feiyangqingyun
4. 知乎主页：https://www.zhihu.com/people/feiyangqingyun/