Qt開源作品15-視頻監控畫面

一、前言

視頻監控系統在整個安防領域，已經做到了爛大街的程序，全國起碼幾百家公司做過類似的系統，當然這一方面的需求量也是非常旺盛的，各種定制化的需求越來越多，尤其是這幾年借着人臉識別的東風，發展更加迅猛，人臉識別相關的技術和應用這幾年處於風口浪尖，衍生了特別多的應用產品，各種人臉識別的產品遍地開花，刷臉門禁，車站機場人臉識別，刷臉取票等，但是其實大部分內行人士可能都比較絕望，外行感覺像看科幻片一樣，老板們各種打雞血，今天幾個億明天幾個億。

縱觀Qt的應用場景領域，在國內，基本上在安防、航天船舶、教育、工業控制領域，占有比較大的比例，其實個人非常喜愛Qt的，從沒見過如此完美的API封裝，包括命名，最牛逼的就是跨平台特性，可以說完爆.NET的跨平台，甚至連那種幾十兆的嵌入式linux版本都能運行，這就使得成本大大降低，提高了產品的豐富性。自從用了Qt以后，就再也不想用VC/VB/C#等。

視頻監控畫面在任何視頻監控系統中是少不了的一個功能，基本上是需要1畫面、4畫面、6畫面、8畫面、9畫面、16畫面等，Qt提供的表格布局非常勝任這個工作，網上幾乎沒有看到qt做的最基礎的視頻監控畫面分割的demo，今天特意花幾分鍾提取出來，開源放出來。歡迎大家多多點贊！現在還增加了25畫面、36畫面，里邊的函數封裝的很好，稍微加幾行可以直接增加49畫面等其他的。

二、代碼思路

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、效果圖

四、開源主頁

以上作品完整源碼下載都在開源主頁，會持續不斷更新作品數量和質量，歡迎各位關注。

1. 國內站點：https://gitee.com/feiyangqingyun/QWidgetDemo
2. 國際站點：https://github.com/feiyangqingyun/QWidgetDemo
3. 個人主頁：https://blog.csdn.net/feiyangqingyun
4. 知乎主頁：https://www.zhihu.com/people/feiyangqingyun/