External/common/combox/searchcombobox.cpp

#include "searchcombobox.h"
#include "wordtopinyin.h"

#include <QStyleFactory>
#include <QListView>
#include <QApplication>
#include <QGraphicsDropShadowEffect>
#include <QTimer>

SearchComboBox::SearchComboBox(QWidget *parent)
    : QComboBox(parent)
    , m_autoquery(false)
    , m_showPopup(false)
{
    setStyle(QStyleFactory::create("Windows"));

    QTimer::singleShot(0, this, [=]
    {
        view()->setMinimumWidth(width() + LISTVIEW_MARGIN * 2);
    });

    setEditable(true);
    setCompleter(nullptr);

    //输入后，开始查询
    connect(this, (void (QComboBox::*)(const QString &))&QComboBox::currentIndexChanged, this, &SearchComboBox::OnCurrentIndexChanged);
}

SearchComboBox::~SearchComboBox()
{
//    qDebug()<<__func__;
}

void SearchComboBox::showPopup()
{
    // QComboBox::showPopup();
    // QWidget *popup = findChild<QFrame*>();
    // popup->move(mapToGlobal(QPoint( - LISTVIEW_MARGIN, height() - LISTVIEW_MARGIN)));
    // m_showPopup = true;

    QComboBox::showPopup();

    if (nullptr != view()) {
        view()->setMinimumWidth(width() + LISTVIEW_MARGIN * 2);
    }
    QWidget *popup = findChild<QFrame*>();
    if (nullptr != popup) {
        popup->move(mapToGlobal(QPoint(-LISTVIEW_MARGIN, height() - LISTVIEW_MARGIN + 4)));
    }
    m_showPopup = true;
}

void SearchComboBox::hidePopup()
{
    QComboBox::hidePopup();
    m_showPopup = false;
}

/* 设置下拉框阴影 */
void SearchComboBox::setViewShadowEffect()
{
    setView(new QListView());
    view()->window()->setWindowFlags(Qt::Popup | Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint);
    view()->window()->setAttribute(Qt::WA_TranslucentBackground);

    //取消拉下动画
    QApplication::setEffectEnabled(Qt::UI_AnimateCombo, false);

    //设置阴影
    QGraphicsDropShadowEffect *pShadowEffect = new QGraphicsDropShadowEffect(this);
    pShadowEffect->setBlurRadius(10); // 模糊度
    pShadowEffect->setColor(QColor(0, 0, 0, 60)); // 阴影的颜色
    pShadowEffect->setOffset(0, 0); // 水平和垂直偏移量
    view()->setGraphicsEffect(pShadowEffect);
}

void SearchComboBox::wheelEvent(QWheelEvent *e)
{
    Q_UNUSED(e);
    //屏蔽鼠标滚动
}
bool SearchComboBox::event(QEvent *event)
{
    //添加一个鼠标滚轮拦截来禁用combox滚轮改变CurrentIndex
    if(event->type()==QEvent::Wheel)
    {
        return true;
    }
    else if(event->type() == QEvent::KeyPress)
    {
        QKeyEvent* ev = (QKeyEvent*)event;
        if(ev->key() == Qt::Key_Enter || ev->key() == Qt::Key_Return){//回车开始查找匹配的数据
            if(isEditable()){
                autoquery();
                m_autoquery = false;
            }
        }
    }
    else if(event->type() == QEvent::MouseButtonPress)
    {
        //点击下拉框，恢复到源数据集

    }
    else if(event->type() == QEvent::FocusOut)
    {
        //离开焦点时，编辑框自动填充当前选择项的文本
        if(!m_showPopup)
        {
            if(!m_currentText.isEmpty())
            {
                setCurrentText(m_currentText);
            }
            else
            {
                int index = currentIndex();
                if(index >= 0 && index < m_items.count())
                {
                    setCurrentText(m_items[index].text);

                }
            }
            update();
        }
    }
    return QComboBox::event(event);
}

void SearchComboBox::OnCurrentIndexChanged(const QString &text)
{
    m_currentText = text;
}

void SearchComboBox::addItem(const QString &text, const QVariant &userData)
{
    ItemData item;
    item.text = text;
    item.userdata = userData;
    item.alphbat = WordToPinyin::firstPinyin(item.text);
    m_items.append(item);
    QComboBox::addItem(item.text, item.userdata);
}

void SearchComboBox::clear()
{
    m_items.clear();
    QComboBox::clear();
}

void SearchComboBox::autoquery()
{
    QString text = currentText().toLower();
    QComboBox::clear();
    if(text.isEmpty())
    {
        //显示源数据集
        foreach(ItemData item,m_items)
        {
            QComboBox::addItem(item.text, item.userdata);
        }
    }
    else
    {
        //显示匹配的数据集
        foreach(ItemData item, m_items)
        {
            if(item.alphbat.toLower().contains(text) || item.text.toLower().contains(text))
            {
                QComboBox::addItem(item.text, item.userdata);
            }
        }

        //没匹配到任何数据
        //....
    }
    showPopup();
}