The use of QCompleter for Qt auto-completion

  QCompleterAutomatic filling function can be realized,方便用户输入,提升用户的体验,一般和QLineEdit与QComboBox搭配起来使用.QCompleterThe class provides the modelitem的提示功能.

目的：The search box is often used to autocomplete searches.
效果：

代码如下：

#include "mainwindow.h"
#include "./ui_mainwindow.h"
#include<QCompleter>
#include<QFileSystemModel>
#include<QDirModel>

#pragma execution_character_set("utf-8")

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    
    ui->setupUi(this);

    QStringList itemList;
    itemList << "北京市" << "河北省" << "河南省" << "test" << "HCTest";
    // 下拉框添加数据
    ui->comboBox->addItems(itemList);

    // 设置可编辑
    ui->comboBox->setEditable(true);

    // 自动补全实例的构建
    QCompleter *comp = new QCompleter(itemList,ui->comboBox->model());

    // 设置匹配模式,只要包含就显示
    comp->setFilterMode(Qt::MatchContains);

    // 设置大小写区分,不区大小写
    comp->setCaseSensitivity(Qt::CaseInsensitive);

    // 设置向用户提供补全的方式
    comp->setCompletionMode(QCompleter::PopupCompletion);

    // 装载补全实例
    ui->comboBox->setCompleter(comp);

    QStringList word_list;
    word_list<<"XiaoTu"<<"xiaomi"<<"Huawei"<<"huafei"<<"Shanghai"<<"shangshan"<<"abc";
    QCompleter *completer = new QCompleter(word_list, this);
    // 设置匹配模式,只要包含就显示
    completer->setFilterMode(Qt::MatchContains);
    // 设置大小写区分,不区大小写
    completer->setCaseSensitivity(Qt::CaseInsensitive);
    // 设置向用户提供补全的方式
    completer->setCompletionMode(QCompleter::PopupCompletion);
    ui->lineEdit->setCompleter(completer);

    QCompleter *completer2 = new QCompleter(this);
    completer2->setModel(new QDirModel(completer2));
    ui->syslineEdit->setCompleter(completer2);
}

MainWindow::~MainWindow()
{
    
    delete ui;
}