Qcombox (rewrite) + qcompleter (auto completion, auto loading the drop-down options of qcombox, setting the background color)

Example ： 

#ifndef ComplexCombox_H
#define ComplexCombox_H

#include <QObject>
#include <QLineEdit>
#include <QEvent>
#include <QKeyEvent>
#include <QWidget>
#include <QDebug>
#include <QTimer>
#include <QComboBox>
#include <QCompleter>
#include <QStringListModel>
#include <QHeaderView>
#include <QLinearGradient>
#include "lightgroupbutton.h"
#include "data/jsondatamanager.h"

#define COMMOM_ADDR_COLOR "#D3D3D3"
#define USED_ADDR_COLOR "#EEEE00"

class ComplexCombox  : public QComboBox
{
    Q_OBJECT
public:
    explicit ComplexCombox(QWidget *parent = 0);
    ~ComplexCombox();    
  
protected:  
    // To load dynamically, you need to rewrite this drop-down function 
    void showPopup()override;

private:
    void initCtr();
    void initData();
    
private:
    QComboBox *m_combox;
    QCompleter *m_completer;  
    QList<int> m_qlAddr;

    int m_iComboxIndex;
    int m_iSelectBtnIndex;

};

#endif // ComplexCombox_H

#include "complexcombox.h"

ComplexCombox::ComplexCombox(QWidget *parent) :
    QComboBox(parent)
{
    initCtr();
}

ComplexCombox::~ComplexCombox()
{

}

void ComplexCombox::initCtr()
{
    m_iComboxIndex=0;
    m_iSelectBtnIndex=0;

    initData();
    setInsertPolicy(QComboBox::InsertAtCurrent);
    //setFixedSize(50,20);
    setCurrentIndex(0);
    setEditable(true);
    QRegExp rx("^([A-Da-d]{1}([1-4]{1}[0-9]{2}|[5]{1}[1]{1}[0-2]{1}|[5]{1}[0]{1}[0-9]{1}|[1-9]{1}[0-9]{1}|[1-9]{1}))$");
    QRegExpValidator *latitude = new QRegExpValidator(rx,this->lineEdit());
    this->lineEdit()->setValidator(latitude);
    this->lineEdit()->setCompleter(m_completer);// Filter to be installed in lineEdit Inside , Otherwise it won't work 
    connect(lineEdit(),SIGNAL(editingFinished()),this,SLOT(slotCboxEditFinished()));
    connect(this,SIGNAL(activated(QString)),this,SLOT(slotCboxActived(QString)));
}

void ComplexCombox::initData()
{
    QStringList slAddr;
    for(int i=0;i<2048;i++)
    {
        m_qlAddr.append(i);
        slAddr << playAddrCovertToSaveAddr(i);
    }
    m_completer = new QCompleter(slAddr,this);
    m_completer->setFilterMode(Qt::MatchStartsWith);
    m_completer->setCaseSensitivity(Qt::CaseInsensitive);

}

void ComplexCombox::showPopup()
{
    emit sigGetCurtBtnIndex(m_iComboxIndex);// It is not necessary to , What I need 

    QComboBox::clear();// It is necessary to 
    QString sCurrentText = this->currentText();// It is necessary to 

    // Here you can select the data you want to display in the drop-down box 
    // You can read files and other things , See what you want 
    for(int i=0;i<m_qlAddr.size();i++)
    {
        addItem(m_qlAddr.value(i));
        if(qlTempUsedAddr.contains(m_qlAddr.value(i)))
        {
            this->setItemData(i,QColor(USED_ADDR_COLOR),Qt::BackgroundColorRole);
        // This can add the background color of the drop-down item , You can also arrange according to your own needs 
        // Give each of the drop-down boxes item Add colors or pictures with setItemData, Adding colors or pictures depends on the third parameter (this It's overloaded QComboBox)
        }
        else
        {
            this->setItemData(i,QColor(COMMOM_ADDR_COLOR),Qt::BackgroundColorRole);
        }

    }
    setCurrentText(sCurrentText);// It is necessary to 
    QComboBox::showPopup();// It is necessary to 
}

 

Qt——QLineEdit Use summary

QT combox Use example of ( Snap after input enter key , And how to add input restrictions to the input edit box （ Regular expressions ）)

QComboBox Custom style （ Reload drop-down box ） Comprehensive usage