QComboBox in QListWidget

sixeight

I am able to get a ComboBox in my List Widget, but how can I get it to update my data? Whenever I change one of the comboboxes, i would like the appropriate VCsetting[].value to be updated.

I am pretty new to QT. I have been looking at this for days. Read about delegates and everything, but I just can't get any of the examples to work. I simply do not understand them. I don't know what I am doing.

Here is my VCsettings.h:

#ifndef VCSETTINGS_H
#define VCSETTINGS_H

// Class for operate the settings of the VController
#include <QDialog>
#include <QTreeWidget>
#include <QString>

#define NUMBER_OF_SELECTABLE_COLOURS 10

class VCsettings
{
public:
    VCsettings();
    void fillTreeWidget(QTreeWidget *my_tree);
    void showData();

private slots:
    void comboBoxValueChanged(int);

private:
    enum type_enum { HEADER, BOOL, VALUE };
    struct Setting_struct {
        QString name;
        type_enum type;
        int value;
        int min;
        int max;
        int sublist;
    };

#define NUMBER_OF_SETTINGS 6

    Setting_struct VCsetting[NUMBER_OF_SETTINGS] = { // The values that are set here are the default settings of the application
        { "General Settings", HEADER, 0, 0, 0, 0 },
        { "Send tempo on patch change", BOOL, 1, 0, 1, 1 },
        { "US20 emulation active", BOOL, 0, 0, 1, 1 },
        { "Colour Settings", HEADER, 0, 0, 0, 0 },
        { "FX colour", VALUE, 1, 0, NUMBER_OF_SELECTABLE_COLOURS - 1, 4 },
        { "Default colour", VALUE, 3, 0, NUMBER_OF_SELECTABLE_COLOURS - 1, 4 },
    };

    QStringList menu_sublist = {
      // Sublist 1 - 3: Booleans
      "OFF", "ON", "DETECT",

      // Sublist 4 - 19: LED colours
      "OFF", "GREEN", "RED", "BLUE", "ORANGE", "TURQUOISE", "WHITE", "YELLOW", "PURPLE", "PINK", "", "", "", "", "", "",

      // Sublist 20 - 22: Main display modes
      "PAGE NAME", "PATCH NAME", "PATCHES COMBINED",

      // Sublist 23 - 30: MIDI ports
      "USB MIDI", "MIDI 1", "MIDI2/RRC", "MIDI 3", "ALL PORTS", "", "", "",

      // Sublist 31 - 34: Expression pedals
      "EXP PEDAL #1", "EXP PEDAL #2", "EXP PEDAL #3", "EXP PEDAL #4",
    };
};

#endif // VCSETTINGS_H

Here is my VCsettings.cpp:

#include "vcsettings.h"
#include "comboboxdelegate.h"
#include <QComboBox>
#include <QDebug>

VCsettings::VCsettings()
{

}

void VCsettings::fillTreeWidget(QTreeWidget *my_tree)
{
  my_tree->setColumnCount(2);
  my_tree->setHeaderLabels(QStringList() << "Parameter" << "Value");
  my_tree->setColumnWidth(0, 250);

  QTreeWidgetItem* parent_item = NULL;

  for (int i = 0; i < NUMBER_OF_SETTINGS; i++) {
      if (VCsetting[i].type == HEADER) {
          QTreeWidgetItem *item = new QTreeWidgetItem(my_tree);
          item->setText(0, VCsetting[i].name);
          my_tree->addTopLevelItem(item);
          parent_item = item;
      }
      else {
          if (parent_item) {
            QTreeWidgetItem *child = new QTreeWidgetItem(parent_item);
            child->setText(0, VCsetting[i].name);
            QComboBox *comboBox = new QComboBox(my_tree);
            //ComboBoxDelegate* comboBox = new ComboBoxDelegate(this);
            if (VCsetting[i].sublist > 0) { // Fill combobox with items from
                int number_of_items = VCsetting[i].max - VCsetting[i].min + 1;
                for (int j = 0; j < number_of_items; j++)
                  comboBox->addItem(menu_sublist.at(j + VCsetting[i].sublist - 1));
                comboBox->setCurrentIndex(VCsetting[i].value);
                //QAbstractItemDelegate::connect(comboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(comboBoxValueChanged(int)));
            }
            my_tree->setItemWidget(child, 1, comboBox);
            parent_item->addChild(child);
          }
      }
  }
}

void VCsettings::showData()
{
    for (int i = 0; i < NUMBER_OF_SETTINGS; i++) {
        qDebug() << VCsetting[i].name << VCsetting[i].value ;
    }
}

void VCsettings::comboBoxValueChanged(int value)
{
    qDebug() << value;
}

Relevant part of MainWindow.h:
VCsettings *MyVCSettings;

And in my MainWindows.cpp:

MyVCSettings = new VCsettings();
    MyVCSettings->fillTreeWidget(ui->treeWidget);

VRonin

Nope, setItemWidget is the enemy of the people! the correct way is subclass QStyledItemDelegate and create a combobox editor in createEditor

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QComboBox in QListWidget