Qt 之 QQ系统表情(四)

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简述

继Qt 之 QQ系统表情(三) 中我们用了两种方法实现了当前鼠标位置的表情动态显示,在这一篇中我们将对其进行拓展,增加一些新特效以及能够自定义表情窗口(包括表情的行列数 , 表情的大小,表情的个数、最大行数等)。好了,话不多说,代码走起。

代码之路

在Qt 之 QQ系统表情(三) 中,我们通过nativeEvent事件捕捉鼠标的位置,根据鼠标的位置判断在QTableWidget中的哪一个item上,但是nativeEvent事件会受到一定的限制,见下图。

这里写图片描述

从Qt文档中可以看出,只有在一个拥有本地窗口句柄的widget中,事件才可以被传递到nativeEvent中。比如我们继承了QTableWidget(命名为MyEmotionWidget),在MyEmotionWidget中重写了nativeEvent事件,而MyEmotionWidget又在其他窗口widget中作为一个成员变量(本身不具有窗口句柄),则nativeEvent事件不会接受到外部的事件。

怎么办呢?

靠,直接在有窗口句柄的widget中重写nativeEvent事件,再将鼠标当前的位置传递给MyEmotionWidget不就OK了,so 上代码。


MyEmotionWidget.cpp

MyEmotionWidget::MyEmotionWidget(QWidget *parent)    : QTableWidget(parent)    , m_tableRow(0)    , m_tableColumn(0)    , m_preRow(0)    , m_preColumn(0)    , m_maxRow(6)    , m_emotionSize(QSize(0 , 0))    , m_emotionMovieSize(QSize(0 , 0)){    loadStyleSheet();}MyEmotionWidget::~MyEmotionWidget(){}// 直接从文件中获取样式void MyEmotionWidget::loadStyleSheet(){    QFile file(":/Resources/QSS/myemotion.css");    file.open(QFile::ReadOnly);    QString strSheet = file.readAll();    QString styleSheet = this->styleSheet();    styleSheet += strSheet;    this->setStyleSheet(styleSheet);}// 设置表情窗口的行列数目void MyEmotionWidget::setRowAndColumn(int row, int column){    m_tableRow = row;    m_tableColumn = column;}// 设置item表情框大小void MyEmotionWidget::setEmotionSize(QSize emotionSize){    m_emotionSize = emotionSize;}// 设置表情movie大小void MyEmotionWidget::setEmotionMovieSize(QSize emotionMovieSize){    m_emotionMovieSize = emotionMovieSize;}// 设置最大行数void MyEmotionWidget::setMaxRow(int maxRow){    m_maxRow = maxRow;}// 设置完参数后,进行初始化void MyEmotionWidget::initTableWidget(){    // 设置无焦点    this->setFocusPolicy(Qt::NoFocus);    // 设置不可编辑    this->setEditTriggers(QAbstractItemView::NoEditTriggers);    // 设置行数    this->setRowCount(m_tableRow);    // 设置列数    this->setColumnCount(m_tableColumn);    // 设置表头不可见并设置表情item框大小    this->horizontalHeader()->setVisible(false);    this->horizontalHeader()->setDefaultSectionSize(m_emotionSize.width());    this->verticalHeader()->setVisible(false);    this->verticalHeader()->setDefaultSectionSize(m_emotionSize.height());    // 设置表情窗口的大小,这里行数超过m_maxRow时作了处理,当行数超过给的最大值,则通过滚动 滚动条显示剩余的表情    if (m_tableRow > m_maxRow)    {        this->setFixedHeight(m_emotionSize.height()*m_maxRow+ 2);        // 这里宽度加30,是因为在这种情况下会tablewidget会显示出滚动条,所以为了显示正常,增加一点宽度        this->setFixedWidth(m_emotionSize.width()*m_tableColumn + 30);    }    else    {        this->setFixedHeight(m_emotionSize.height()*m_tableRow + 2);        this->setFixedWidth(m_emotionSize.width()*m_tableColumn + 2);    }}void MyEmotionWidget::addEmotionItem(QString fileName , QString toolTip){    int row = m_emotionList.size() / this->columnCount();    int column = m_emotionList.size() % this->columnCount();    QTableWidgetItem* tableWidgetItem = new QTableWidgetItem;    tableWidgetItem->setToolTip(toolTip);    this->setItem(row, column, tableWidgetItem);    QLabel* emotionIcon = new QLabel;    emotionIcon->setContentsMargins(3, 3, 3, 3);    // 设置鼠标悬浮时显示蓝色边框;    emotionIcon->setStyleSheet("QLabel:hover{border: 1px solid rgb(111, 156, 207);\                                color: rgb(2, 65, 132);\                                background: rgba(255, 255, 255, 200);}");    QMovie* movie = new QMovie;    movie->setScaledSize(QSize(24, 24));    movie->setFileName(fileName);    // start and stop 后图片显示正常;    movie->start();    movie->stop();    emotionIcon->setMovie(movie);    this->setCellWidget(row, column, emotionIcon);    m_emotionList.push_back(fileName);}// 因为MyEmotionWidget作为子部件来使用,故nativeEvent接收不到事件,这里由外部调用传入鼠标在父部件的位置void MyEmotionWidget::showDynamicEmotion(QPoint cursorPos){    // 当前传入的为鼠标在父控件上的位置,所以还需要减去tableWidget在父控件上的位置,其结果为鼠标在tableWidget的位置    QPoint point = cursorPos - this->pos();     QTableWidgetItem* tableWidgetItem = this->itemAt(point);    if (tableWidgetItem != NULL)    {        //如果获取到的item不为空说明此刻鼠标所在的区域在tableWidget的某个item中,        //并且如果鼠标从一个表情移动到一个其他未设置item的单元格或者移出tableWidget区域        //在同一个item中移动则不做任何操作;        if (m_preRow != tableWidgetItem->row() || m_preColumn != tableWidgetItem->column())        {            QLabel* preEmotion = (QLabel*)this->cellWidget(m_preRow, m_preColumn);            if (preEmotion != NULL)            {                //恢复原来的margin                preEmotion->setContentsMargins(3, 3, 3, 3);                QMovie* preMoive = preEmotion->movie();                preMoive->jumpToFrame(0);                preMoive->stop();            }            QLabel* curEmotion = (QLabel*)this->cellWidget(tableWidgetItem->row(), tableWidgetItem->column());            if (curEmotion != NULL)            {                // 当鼠标悬浮在item上时修改margin值达到表情切换效果,见下图(在鼠标从一个表情滑到另一个表情时)                curEmotion->setContentsMargins(4, 2, 2, 4);                QMovie* curMoive = curEmotion->movie();                curMoive->start();                m_preRow = tableWidgetItem->row();                m_preColumn = tableWidgetItem->column();            }        }    }    else    {        //如果获取到的item为空说明此刻鼠标所在的区域不在tableWidget的items中,        //并且如果鼠标刚从一个动态表情移动到一个其他未设置item的单元格或者移出tableWidget区域,        //则根据上一个表情的位置获取到item并停止正在动态显示的表情,并将m_preRow、m_preColumn置为-1,        //以免下次再次进入到此分支进行重复操作;        QTableWidgetItem* tableWidgetItem = this->item(m_preRow, m_preColumn);        if (tableWidgetItem != NULL)        {            QLabel* preEmotion = (QLabel*)this->cellWidget(m_preRow, m_preColumn);            if (preEmotion != NULL)            {                //恢复原来的margin                preEmotion->setContentsMargins(3, 3, 3, 3);                QMovie* preMoive = preEmotion->movie();                preMoive->jumpToFrame(0);                preMoive->stop();                m_preRow = -1;                m_preColumn = -1;            }        }    }}

EmotionWindow.cpp

EmotionWindow::EmotionWindow(QWidget *parent)    : QWidget(parent)    , m_smallEmotionWidget(NULL)    , m_normalEmotionWidget(NULL){    ui.setupUi(this);    initWindow();    initEmotion();}EmotionWindow::~EmotionWindow(){}void EmotionWindow::initWindow(){    this->setWindowFlags(Qt::FramelessWindowHint);    this->setStyleSheet("background:rgb(220, 240, 160);");}// 初始化表情窗口void EmotionWindow::initEmotion(){    // 初始化小表情框;    m_smallEmotionWidget = new MyEmotionWidget;    m_smallEmotionWidget->setRowAndColumn(4, 4);    m_smallEmotionWidget->setEmotionSize(QSize(32, 32));    m_smallEmotionWidget->setEmotionMovieSize(QSize(24, 24));    m_smallEmotionWidget->setMaxRow(4);    m_smallEmotionWidget->initTableWidget();    //表情的路径    QString path = ":\\Resources\\QQexpression\\%1.gif";    for (int i = 0; i < 10; i++)    {        m_smallEmotionWidget->addEmotionItem(path.arg(i + 1), "");    }    // 初始化正常表情框;    m_normalEmotionWidget = new MyEmotionWidget;    m_normalEmotionWidget->setRowAndColumn(10, 14);    m_normalEmotionWidget->setEmotionSize(QSize(32, 32));    m_normalEmotionWidget->setEmotionMovieSize(QSize(24, 24));    m_normalEmotionWidget->setMaxRow(6);    m_normalEmotionWidget->initTableWidget();    for (int i = 0; i < 132; i++)    {        m_normalEmotionWidget->addEmotionItem(path.arg(i + 1), "");    }    // 初始化样式    m_lableTitle = new QLabel;    QVBoxLayout* vLayout = new QVBoxLayout;    vLayout->addWidget(m_lableTitle);    vLayout->addWidget(m_smallEmotionWidget);    vLayout->addWidget(m_normalEmotionWidget);    this->setLayout(vLayout);}// 显示小表情窗口void EmotionWindow::showSmallEmotion(QPoint point){    m_normalEmotionWidget->setVisible(false);    m_lableTitle->setText("This is Small Emotion Window");    this->setFixedSize(QSize(m_smallEmotionWidget->width() + 20, m_smallEmotionWidget->height() + 50));    move(point);    show();}// 显示大表情窗口void EmotionWindow::showNormalEmotion(QPoint point){    m_smallEmotionWidget->setVisible(false);    m_lableTitle->setText("This is Normal Emotion Window");    this->setFixedSize(QSize(m_normalEmotionWidget->width() + 20, m_normalEmotionWidget->height() + 50));    move(point);    show();}// 重写nativeEvent事件bool EmotionWindow::nativeEvent(const QByteArray &eventType, void *message, long *result){    MSG* msg = reinterpret_cast<MSG*>(message);    switch (msg->message)    {    case WM_MOUSEMOVE:    {        // 将鼠标在EmotionWindow上的坐标传递到表情窗口中        QPoint point = QCursor::pos() - this->pos();        m_normalEmotionWidget->showDynamicEmotion(point);        m_smallEmotionWidget->showDynamicEmotion(point);    }    }    return __super::nativeEvent(eventType, message, result);}
// 显示表情窗口EmotionWindow w;w.showSmallEmotion(QPoint(500 , 500));//w.showNormalEmotion(QPoint(500 , 500));

小表情框

这里写图片描述

正常表情框

这里写图片描述


功夫不负有心人,到此我们已经通过nativeEvent方法实现了自定义表情窗口。大家可以看到可以自定义表情窗口的行列数、表情数目,最大行数等,下一篇将通过重写QLabel的方式完成自定义表情窗口。

这里写图片描述 加油,前行中的Small Pig !!!

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