QLayoutPrivate issue

[gimel]

I am trying to extend the Qt example FlowLayout to include the insertWidgetAt(int position, QWidget* w) method.

I wrote (borrowed the code from QBoxLayout):

//public:
void FlowLayout::insertWidgetAt(int pos,QWidget *w){
     addChildWidget(w);
     insertItem(pos,QLayoutPrivate::createWidgetItem(this, w)); //***
     invalidate();
}
 
//private:
void FlowLayout::insertItem(int pos,QLayoutItem *item){
     itemList.insert(pos,item);
}

//public:
void FlowLayout::insertWidgetAt(int pos,QWidget *w){
     addChildWidget(w);
     insertItem(pos,QLayoutPrivate::createWidgetItem(this, w)); //***
     invalidate();
}

//private:
void FlowLayout::insertItem(int pos,QLayoutItem *item){
     itemList.insert(pos,item);
}

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At the line marked with //***, gcc gives "incomplete type `QLayoutPrivate' used in nested name specifier" error. What should I do to implement the method?

[spirit]

use QWidgetItem insted of QLayoutPrivate::createWidgetItem.
i.e.

insertItem(pos,QWidgetItem(w));

insertItem(pos,QWidgetItem(w));

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[gimel]

I resolved this issue by

#include <QtGui/private/qlayout_p.h>

#include <QtGui/private/qlayout_p.h>

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If this will not work, I'll try your solution.

[spirit]

it is bad idea to use Qt's internal code.

[gimel]

Indeed! Thank you.

[levi]

I'm trying to do the exact same thing. This thread is rather old, but I would be very happy to know how you solved this. I'm struggling with getting the suggestion from "spirit" to work.

[thegecko]

You also need to store the widget using addChildWidget(). So the additional functions should look like the following:

void FlowLayout::insertItem(int index, QLayoutItem *item)
{
    itemList.insert(index, item);
}
 
void FlowLayout::insertWidget(int index, QWidget *widget)
{
    addChildWidget(widget);
    QWidgetItem *item = new QWidgetItem(widget);
    insertItem(index, item);
}

void FlowLayout::insertItem(int index, QLayoutItem *item)
{
    itemList.insert(index, item);
}

void FlowLayout::insertWidget(int index, QWidget *widget)
{
    addChildWidget(widget);
    QWidgetItem *item = new QWidgetItem(widget);
    insertItem(index, item);
}

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P.S. this works for me.