Qt编写安防视频监控系统9-自动隐藏光标

#include "appinit.h"
#include "quiwidget.h"
#include "dbhelper.h"

QScopedPointer<AppInit> AppInit::self;
AppInit *AppInit::Instance()
{
    if (self.isNull()) {
        static QMutex mutex;
        QMutexLocker locker(&mutex);
        if (self.isNull()) {
            self.reset(new AppInit);
        }
    }

    return self.data();
}

AppInit::AppInit(QObject *parent) : QObject(parent)
{
}

bool AppInit::eventFilter(QObject *watched, QEvent *event)
{
    //负责将密码字符串存入队列
    if (event->type() == QEvent::KeyPress) {
        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        int keyValue = keyEvent->key();
        if (keyValue == Qt::Key_Escape) {
            emit keyPressed("esc");
            return true;
        } else if (keyEvent->modifiers() & Qt::AltModifier) {
            if (keyValue == Qt::Key_Enter || keyValue == Qt::Key_Return) {
                emit keyPressed("alt+enter");
                return true;
            }
        }
    }

    if (event->type() == QEvent::MouseMove) {
        //记住最后鼠标移动的时间,超过一定值则隐藏光标,一旦动了则显示光标
        lastTime = QDateTime::currentDateTime();
        if (cursorHide) {
            cursorHide = false;
            qApp->restoreOverrideCursor();
        }
    }

    //以下代码处理无边框窗体可拖动
    QWidget *w = (QWidget *)watched;
    if (!w->property("canMove").toBool()) {
        return QObject::eventFilter(watched, event);
    }

    static QPoint mousePoint;
    static bool mousePressed = false;

    QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
    if (event->type() == QEvent::MouseButtonPress) {
        if (mouseEvent->button() == Qt::LeftButton) {
            mousePressed = true;
            mousePoint = mouseEvent->globalPos() - w->pos();
            return true;
        }
    } else if (event->type() == QEvent::MouseButtonRelease) {
        mousePressed = false;
        return true;
    } else if (event->type() == QEvent::MouseMove) {
        if (mousePressed && (mouseEvent->buttons() && Qt::LeftButton)) {
            w->move(mouseEvent->globalPos() - mousePoint);
            return true;
        }
    }

    return QObject::eventFilter(watched, event);
}

void AppInit::checkCursor()
{
    //超过规定时间鼠标未动则隐藏光标
    if (!cursorHide) {
        QDateTime now = QDateTime::currentDateTime();
        if (lastTime.secsTo(now) > App::CursorHideTime) {
            cursorHide = true;
            qApp->setOverrideCursor(Qt::BlankCursor);
        }
    }
}

void AppInit::start()
{
    qApp->installEventFilter(this);

    //设置左侧+最大化+最小化+关闭 图标
    QUIConfig::IconMain = 0xf108;
    QUIConfig::IconMax = 0xf2d2;
    QUIConfig::IconNormal = 0xf2d0;

    //设置全局字体
    QUIConfig::FontSize = 12;
    QFont font;
    font.setFamily(QUIConfig::FontName);
    font.setPixelSize(QUIConfig::FontSize);
    qApp->setFont(font);

    //设置编码
    QUIHelper::setCode();
    //设置翻译文件
    QUIHelper::setTranslator();
    QUIHelper::setTranslator(":/image/widgets.qm");
    //初始化随机数种子
    QUIHelper::initRand();

    //生成文件夹
    QUIHelper::newDir("config");
    QUIHelper::newDir("snap");
    QUIHelper::newDir("db");

    //载入配置文件
    App::ConfigFile = QString("%1/config/%2.ini").arg(QUIHelper::appPath()).arg("video_system");
    App::readConfig();

    DBData::NvrTypes << "海康" << "大华" << "宇视" << "深广" << "其他";
    DBData::IpcTypes << "海康" << "大华" << "宇视" << "泰杰" << "其他";

    //判断数据库文件是否存在,不存在则从资源文件复制出来
    QString dbName = QString("%1/db/%2.db").arg(QUIHelper::appPath()).arg("video_system");
    QFile dbFile(dbName);
    if (!dbFile.exists() || dbFile.size() == 0) {
        QUIHelper::showMessageBoxError("数据库文件不存在!");
    }

    //程序启动后打开数据库连接,在任何窗体需要的地方调用数据库
    QSqlDatabase dbConn;
    dbConn = QSqlDatabase::addDatabase("QSQLITE");
    dbConn.setDatabaseName(dbName);
    dbConn.open();

    //载入默认数据
    DBHelper::loadUserInfo();
    DBHelper::loadNvrInfo();
    DBHelper::loadIpcInfo();

    //启动定时器计算多久用户没有操作过鼠标
    cursorHide = false;
    lastTime = QDateTime::currentDateTime();
    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(checkCursor()));
    timer->start(1000);
}