Den 14-06-2013 12:12, Alejandro Exojo skrev:
> Hi.
>
> I've implemented a kind of vertical list of widgets with a class based
> on QScrollArea. The main widget has QVBoxLayout as layout. I have a
> method to clear the whole list and empty the layout, and another to add
> one widget to the layout.
>
> The problem I'm having is that I clear and fill the layout both with the
> widget visible and not visible (the list is in a QDialog, so I have to
> fill it before I call exec()). When the list/layout contents change with
> the widget visible, everything is fine. But if I do it before the
> exec(), so before is shown, the layout only grows if previously had less
> items, but it never shrinks if I empty it and add less items than
> previously.
>
> I'm doing the following to empty the list, where m_list is a QList with
> pointers to the elements added and m_layout is the layout of the
> widget() of the QScrollArea:
>
> void List::clear()
> {
> while (!m_list.empty()) {
> QWidget* widget = m_list.takeLast();
> m_layout->removeWidget(widget);
> delete widget;
> }
> }
>
> And the following to add widgets:
>
> void List::addWidget(QWidget* item)
> {
> // This widget draws a left-bottom-right frame.
> QWidget* frame = new QWidget(this);
> frame->setStyleSheet(".QWidget {"
> "border: 3px solid rgb(6, 78, 125);"
> "border-top: 0px;"
> "}"
> );
> // Wrapper layout: the frame widget has inside the interesting
> contents (another widget)
> QVBoxLayout* wrap = new QVBoxLayout();
> wrap->setMargin(0);
> wrap->setSpacing(0);
> wrap->addWidget(item);
> frame->setLayout(wrap);
> frame->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Preferred);
>
> frame->installEventFilter(this);
> m_list.append(frame);
> m_layout->addWidget(frame);
> }
>
>
> I've also put the main widget in an event filter, and I've seen is
> receiving Resize events when calling addWidget with the widget visible,
> but no resize events at all before is shown.
>
> I've also tried to call update() and repaint() in layouts and widgets
> here and there, but no change at all.
Hi Alejandro,
Try calling invalidate() on the layout or updateGeometry() on the
container widget.
Bo.
--
Bo Thorsen, European Qt Manager, Integrated Computer Solutions
ICS - Delivering World-Class Applications for Embedded & Mobile Devices
http://ics.com/services
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