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POWhy doesnt the old widget get removed?
 

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    <p>Because of the mouseEvent, I would expect the red and blue widgets to switch places on every click. Instead the red switches to the blue and then it never switches back, why?</p> <pre><code>Frame *red = NULL; Frame *blue = NULL; bool isRed = true; Frame::Frame(QWidget *parent) : QFrame(parent) { } Frame::~Frame(){ printf("deleted.\n"); fflush(0); } void QLayout_clear(QLayout* layout, bool deleteWidgets){ QLayoutItem* item; QLayout* childLayout; while ((item = layout->takeAt(0)) != NULL){ QWidget* widget = item->widget(); if (widget != NULL){ layout->removeWidget(widget); if (deleteWidgets){ delete widget; } } else if (childLayout = item->layout()){ QLayout_clear(childLayout, deleteWidgets); } //delete item; } } Widget::Widget(QWidget *parent) : QWidget(parent) { QVBoxLayout *layout = new QVBoxLayout; this->setLayout(layout); red = new Frame; red->setFixedSize(100,100); red->setStyleSheet("background-color:red"); blue = new Frame; blue->setFixedSize(100,100); blue->setStyleSheet("background-color:blue"); layout->addWidget(red); } void Widget::mouseReleaseEvent(QMouseEvent *){ printf("clicked.\n"); fflush(0); QVBoxLayout *layout = (QVBoxLayout *)this->layout(); if (1){ //it doesnt matter if this is 1 or 0 delete layout; layout = new QVBoxLayout; this->setLayout(layout); } else { QLayout_clear(layout, false); } if (isRed){ layout->addWidget(blue); isRed = false; } else { layout->addWidget(red); isRed = true; } }</code></pre> <p>Note: here I am using a simple QFrame for the widgets to switch, in my application the widgets are much more complicated and I cannot recreate them every time I want to swap.</p>
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