Help with how to do something...

[VRonin]

@SPlatten said in Help with how to do something...:

Each row will have a label and to the right of the label a control which will be either a drop down list or a text entry.

Sounds like a QTableView with a custom delegate to me

[SPlatten]

@VRonin , please tell me more.

[VRonin]

You can use QTableView+QStandardItemModel

QStandardItemModel* model = new QStandardItemModel;
model->insertColumns(0,2);
model->insertRows(0, rowCount);
for(int i=0;i<rowCount;++i){
QStandardItem* item = new QStandardItem;
item->setData(tr("Label %1").arg(i+1),Qt::EditRole);
item->setFlags(item->flags() & ~Qt::ItemIsEditable);
model->setItem(i,0,item);
}
tableview->setModel(model);

The text entry you get for free (it's the default editor) for the dropdown list you have 2 ways:

• subclass QItemEditorFactory and in createEditor decide to return the default lineedit or a combobox
• subclass QStyledItemDelegate and reimplement createEditor/setEditorData/setModelData

The latter is a tiny bit more involved but it gives you more control. It really depends on how you determine whether to show a lineedit or a combobox

[mrjj]

Hi
Adding to @VRonin
You can get a delegate from here
https://wiki.qt.io/Combo_Boxes_in_Item_Views

[SPlatten]

@VRonin , thank you, I will look into this, can I drop in the QTableView to replace the QScrollArea?

Can you help me with where it would go in the structure I have?

[VRonin]

@SPlatten said in Help with how to do something...:

can I drop in the QTableView to replace the QScrollArea?

QTableView inherits QScrollArea so yes, it's a straight replacement

[SPlatten]

@VRonin , before I dive in and rip out the code I currently have, what I want to achieve is have a scrollable list of rows where each row as on the left a label and on the right an input widget, one of the following either text entry, combo box or drop down.

I don't want a row highlight just a scrollbar if necessary. Will the QTableView be suitable for this?

[VRonin]

@SPlatten said in Help with how to do something...:

Will the QTableView be suitable for this?

You will just need some styling of the tableview, nothing major

[SPlatten]

@VRonin , thank you, I'm up against time and need to get this implemented...

[SPlatten]

@VRonin , to be honest, this is a bigger learning curve than I have time for, all I need is a scrollable area with a label and input widget on each row. I don't want something that looks like a spreadsheet, just a standard dialog look and feel with a scrollbar if required.

If I drag and drop the widgets using Qt Creator I can create what I want in the WYSIWYG editor, but I can't use this, I have to create the same in code.

[mrjj]

Hi
I think the code your shown is missing something from the scroll area setup. like settings its content widget.
https://doc.qt.io/qt-5/qscrollarea.html#setWidget

Just to be clear. you are looking for something like this

  auto scrollArea = new QScrollArea(centralWidget());
    scrollArea ->move(10, 10);
    scrollArea ->resize(400, 400); // you dont need this as you should put it in a layout in your dialog
    scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    scrollArea->setWidgetResizable(true);
    // set up its center widget as docs tells
    auto scrollAreaWidgetContents = new QWidget();
    auto verticalLayout = new QVBoxLayout(scrollAreaWidgetContents);
    verticalLayout->setSpacing(4);
    verticalLayout->setContentsMargins(4, 4, 4, 4);
    // setup the "row" handler widget using  a from layout
    auto rowHandlerwidget = new QWidget(scrollAreaWidgetContents);
    auto formLayout = new QFormLayout(rowHandlerwidget);
    formLayout->setSpacing(4);
    formLayout->setContentsMargins(1, 1, 1, 1);
    // add some "rows!
    for (int numRows = 0; numRows < 50; ++numRows) {
        auto label = new QLabel(rowHandlerwidget);
        label ->setText( "Im Setting:" + QString::number(numRows));
        formLayout->setWidget(numRows, QFormLayout::LabelRole, label);
        if ( numRows % 3 ) {
            auto lineEdit = new QLineEdit(rowHandlerwidget);
            formLayout->setWidget(numRows, QFormLayout::FieldRole, lineEdit);
        } else {
            auto combo = new QComboBox(rowHandlerwidget);
             formLayout->setWidget(numRows, QFormLayout::FieldRole, combo);
        }
    }
    // assign row hander widget
    verticalLayout->addWidget(rowHandlerwidget);
    // assign scrollsbox widget
    scrollArea->setWidget(scrollAreaWidgetContents); // do you have this one ?

[SPlatten]

A little progress, to see if I could figure out what was going wrong I set the background colour of the widget in the tab to red:
cid:image002.jpg@01D7433C.78A4BD40

Why is the widget so small? It was added to the tab with:

psaTab->setWidget(pPage); //psaTab = pointer to QScrollArea
mpTabs->addTab(psaTab, strTab); // mpTabs = member pointer to QTabsWidget

I thought the page would fill the area of the tab ?

[SPlatten]

@mrjj , thank you thats exactly the kind of thing I am looking for, all the examples I've seen online just add the QScrollArea to the tab, what do I need to do to get it to fill the tab area?

[mrjj]

@SPlatten
Hi
you assign a layout to the tabpage to which you add the scroll area.
then layout will make it use all space.

[SPlatten]

@mrjj , if you see the code I pasted earlier:

QScrollArea* psaTab = new QScrollArea();
QGridLayout* pgrdLayout = new QGridLayout();
QWidget* pPage = new QWidget();
pPage->setLayout(pgrdLayout);
psaTab->setWidget(pPage);
mpTabs->addTab(psaTab, strTab);

[mrjj]

@SPlatten

Hmm so you use the scroll area directly as a "page" for the tab control?
That should make it cover all area.

[SPlatten]

@mrjj , they're obviously something I've done wrong.

[mrjj]

@SPlatten
Hi
well might not be wrong. just forgotten.
do you have
scroll->setWidgetResizable(true);

[SPlatten]

@mrjj , thank you so much, one line and that was it!