I want the list view of QComboBox to be in a separate dialog widget. To achieve this, I've subclassed QComboBox, and use the showPopup() and hidePopup() functions to view the dialog. The dialog now takes a QListView as constructor parameter from the combo, but doing it this way, I see that the list in dialog does not have the same selection as the original combo. Should I do the QListView pointer differently?


Qt Code: 
  1. ComboBox::ComboBox(QWidget *parent, QString strTitle) :
  2.     QComboBox(parent)
  3. {
  4.  
  5.     m_pListView = new QListView(this);
  6.  
  7.     QFont newfont = font();
  8.     newfont.setPixelSize(globalUI->zoomInt(9));
  9.     m_pListView->setFont(newfont);
  10.     setMinimumContentsLength(10);
  11.     setView(m_pListView);
  12.  
  13.     m_pComboList = new ComboList(this, m_pListView);
  14.     SetTitle(strTitle);
  15.  
  16. }
  17.  
  18. void ComboBox::SetTitle(QString strTitle)
  19. {
  20.     m_pComboList->SetTitle(strTitle);
  21. }
  22.  
  23. void ComboBox::showPopup ()
  24. {
  25.     m_pComboList->exec();
  26. }
  27.  
  28. void ComboBox::hidePopup ()
  29. {
  30.     m_pComboList->hide();
  31. }
  32.  
  33. ComboList::ComboList(QWidget *parent, QListView *pListView, QString strTitle):
  34.     DialogExt(parent)
  35. {
  36.     // Only to be shown when combobox popup is to be shown
  37.     this->hide();
  38.  
  39.     if (pListView == 0)
  40.     {
  41.         qWarning() << "[ComboList::ComboList] listView is 0";
  42.         return;
  43.     }
  44.     // List
  45.     pListView->setVerticalScrollMode(QListWidget::ScrollPerPixel);
  46.     pListView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  47.     pListView->setWordWrap(true);
  48.  
  49.     m_pTextEditSearchFilter = new textNumericInput(this);                     //this is a subclass of QLineEdit
  50.     connect(m_pTextEditSearchFilter, SIGNAL(SigTextChanged(QString)), this, SLOT(FilterChanged(QString)));
  51.  
  52.     //used for filtering list view
  53.     m_pProxyModel = new QSortFilterProxyModel(this);
  54.     m_pProxyModel->setSourceModel(pListView->model());
  55.     pListView->setModel(m_pProxyModel);
  56.  
  57.     m_ppushBack = new MenuButton(this, ":/icons/back_white" + globalUI->GetImageSuffix(),tr("Back"), globalUI->zoomSize(QSize(40,30)),false);
  58.     globalUI->setMenuButtonProperties(m_ppushBack,UIToolbox::MBTSubMenuButton);
  59.  
  60.     QFrame *pFrameMenuBar = new QFrame(this);
  61.     pFrameMenuBar->setStyleSheet("background: gray;");
  62.     QHBoxLayout *playoutmenuBar = new QHBoxLayout(pFrameMenuBar);
  63.     playoutmenuBar->setMargin(0);
  64.     playoutmenuBar->setSpacing(0);
  65.     playoutmenuBar->addStretch();
  66.     playoutmenuBar->addWidget(m_ppushBack);
  67.     playoutmenuBar->addStretch();
  68.  
  69.     m_plblTitle = new QLabel(strTitle, this);
  70.     m_plblTitle->setWordWrap(true);
  71.     m_plblTitle->setAlignment(Qt::AlignCenter);
  72.     m_plblTitle->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
  73.     m_plblTitle->setStyleSheet("background: #D8D8D8; font-size: " + QString::number(globalUI->zoomInt(7)) + "px;");
  74.  
  75.     QWidget *widPlaceholderMain = new QWidget();
  76.     QVBoxLayout *playoutMain = new QVBoxLayout(widPlaceholderMain);
  77.     playoutMain->setMargin(0);
  78.     playoutMain->addWidget(m_plblTitle);
  79.     playoutMain->addSpacing(1);
  80.     playoutMain->addWidget(m_pTextEditSearchFilter);
  81.     playoutMain->addSpacing(1);
  82.  
  83.     QWidget *widPlaceholder = new QWidget();
  84.     QVBoxLayout *playoutMainScroll = new QVBoxLayout(widPlaceholder);
  85.     playoutMainScroll->addWidget(pListView);
  86.  
  87.     QScrollArea *scroll = new QScrollArea(this);
  88.     scroll->setContentsMargins(0,0,0,0);
  89.     scroll->setFrameShape(QFrame::NoFrame);
  90.     scroll->setLineWidth(0);
  91.     scroll->setWidgetResizable(true);
  92.     scroll->setMinimumHeight(0);
  93.     scroll->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  94.     scroll->setWidget(widPlaceholder);
  95.  
  96.     QVBoxLayout *layVMain = new QVBoxLayout(this);
  97.     layVMain->setMargin(0);
  98.     layVMain->setSpacing(0);
  99.     layVMain->addWidget(widPlaceholderMain);
  100.     layVMain->addWidget(scroll);
  101.     layVMain->addWidget(pFrameMenuBar);
  102. }
  103.  
  104. void ComboList::SetTitle(QString strTitle)
  105. {
  106.     m_plblTitle->setText(strTitle);
  107. }
  108.  
  109. void ComboList::FilterChanged(QString strFilter)
  110. {
  111.     m_pProxyModel->setFilterRegExp(QRegExp(strFilter, Qt::CaseInsensitive, QRegExp::FixedString));
  112.  
  113. }
To copy to clipboard, switch view to plain text mode