QML 用QSortFilterProxyModel实现搜索功能

#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QtQml>
...
#include "bookmodel.h"
int main(int argc, char *argv[])
{
    ...
    qmlRegisterType<BookModel>("Backend", 1, 0, "BookModel");//向qml注册类型

    BookModel *bookModel = new BookModel();//这是自己定义的类
    QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel();
    ...
    bookModel->read(io->text()["book"]);//io是自己定义的读取json的类
    QQmlApplicationEngine *engine = new QQmlApplicationEngine();

    proxyModel->setSourceModel(bookModel);
    //向qml传递变量
    engine->rootContext()->setContextProperty("bookModel", bookModel);
    engine->rootContext()->setContextProperty("proxyModel", proxyModel);

    engine->load(QUrl(QLatin1String("qrc:/main.qml")));

    return app.exec();
}

import QtQuick 2.7
import QtQuick.Controls 2.1
import QtQuick.Layouts 1.3
import QtQuick.Controls.Material 2.1
import QtQuick.Controls.Universal 2.1
import QtQuick.Window 2.1
import Backend 1.0
LDialog{//LDialog是自己修改过的的对话框Dialog
    title: "查找"
    width: 460
    height: 180
    signal search(int range, string text)
    Row{
        spacing: 20
        ComboBox{
            id: combo
            model:[qsTr("书名"),qsTr("出版社"),qsTr("作者"),qsTr("简介"),qsTr("购书日期"),qsTr("id"),qsTr("ISBN号"),qsTr("价格")]
        }
        TextField {
            id: word
            width: 200
        }
        Button {
            id: searchBtn
            text: qsTr("查找")

            onClicked: {
                var comap=new Array(BookModel.NameRole,BookModel.PublishRole,BookModel.AuthorRole,
                BookModel.BriefRole,BookModel.BuyTimeRole,BookModel.IdRole,
                    BookModel.IsbnRole,BookModel.PriceRole);//这里的Role是BookModel类里面的一个enum
                search(comap[combo.currentIndex],word.text);
            }
        }
    }
}

    Search{
        id: findBookDialog
        onSearch: {
            proxyModel.filterRole=range;//这个filterRole是proxyModel搜索的范围，也就是指定BookModel中的一个属性
            proxyModel.setFilterFixedString(text);//设置搜索内容
            bookView.model=proxyModel;//设置展示的内容为搜索筛选后的
        }
        onRejected: {//取消时显示原来的内容
            bookView.model=bookModel;
        }
    }