我遵循模型/视图/控制器范式。我很确定模型和视图是正确的,但我认为我的代表做错了一些事情。一切都“正常工作”,除了第一次单击控件只是“点亮控件”并且第二个与之交互。这就是代表通常的实现方式吗?我的实现需要大量的构造和破坏(由 scoped_ptr 隐藏),因此任何有关这方面的提示也很有帮助。
QWidget *ParmDelegate::createWidget(const QModelIndex &index) const {
if (!index.isValid())
return NULL;
const Parm *p = static_cast<const Parm*>(index.internalPointer());
QWidget *w = p->createControl();
w->setAutoFillBackground(true);
w->setBackgroundRole(QPalette::Base); // white background instead of grey
return w;
}
QWidget*
ParmDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const {
QWidget *retval = createWidget(index);
if (dynamic_cast<QComboBox*>(retval))
connect(retval, SIGNAL(activated(int)), this, SLOT(commitAndCloseEditor()));
else if (dynamic_cast<QSlider*>(retval))
connect(retval, SIGNAL(sliderReleased()), this, SLOT(commitAndCloseEditor()));
else if (dynamic_cast<QAbstractButton*>(retval))
connect(retval, SIGNAL(clicked()), this, SLOT(commitAndCloseEditor()));
else
connect(retval, SIGNAL(editingFinished()), this, SLOT(commitAndCloseEditor()));
retval->setFocusPolicy(Qt::StrongFocus);
retval->setParent(parent);
return retval;
}
void
ParmDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const {
const Parm *p = static_cast<const Parm*>(index.internalPointer());
p->setEditorData(editor);
}
void
ParmDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const {
ParmControl::Base* base = dynamic_cast<ParmControl::Base*>(editor);
model->setData(index, base->toQVariant());
}
void
ParmDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const {
editor->setGeometry(option.rect);
}
void
ParmDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
scoped_ptr<QWidget> w(createWidget(index));
if (!w)
return;
const Parm *p = static_cast<const Parm*>(index.internalPointer());
setEditorData(w.get(), index);
w->setGeometry(option.rect);
w->render(painter, option.rect.topLeft());
}
QSize
ParmDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const {
scoped_ptr<QWidget> w(createWidget(index));
if (!w)
return QSize(0,0);
return w->sizeHint();
}
void
ParmDelegate::commitAndCloseEditor() {
QWidget *editor = static_cast<QWidget *>(sender());
ParmControl::Base* base = dynamic_cast<ParmControl::Base*>(editor);
emit commitData(editor);
emit closeEditor(editor, QAbstractItemDelegate::EditNextItem);
}