Need help from QT Experts ( Model / View for QDateTimeEdit widget)
-
As for your single widget with multiple properties, here's a workaround taking advantage of Qt's dynamic properties. Note that I don't find it elegant because it requires one widget per property but at least you can have your single QDateTimeEdit used.
class QDWMProxy : public QWidget { public: /*! Set which property should be set on the target */ void setMapping(QWidget *target, const QByteArray& propertyName) { _target = target; _propertyName = propertyName; } bool event(QEvent *event) override { if (event->type() == QEvent::DynamicPropertyChange) { QDynamicPropertyChangeEvent *pe = static_cast<QDynamicPropertyChangeEvent *>(event); if (pe->propertyName() == _propertyName) { _target->setProperty(_propertyName, property(_propertyName)); event->accept(); return true; } } return QWidget::event(event); } private: QWidget *_target; QByteArray _propertyName; };You'll create one proxy per properties and use it for the QDataWidgetMapper mapping function. Don't forget to handle their deletion appropriately.
Dummy main.cpp example:
MyCustomWidget widget; QDWMProxy proxyHours; proxy1.setMapping(&widget, "hours"); QDWMProxy proxyMinutes; proxy2.setMapping(&widget, "minutes"); QDataWidgetMapper mapper; mapper.setModel(model); mapper.addMapping(&proxyHours, 0, "hours"); mapper.addMapping(&proxyMinutes, 1, "minutes"); mapper.toFirst(); widget.show();I'll let you replace your model and widget.
@SGaist Dear SGaist, I could not make it 100 % working , so posting here the widget code. I have tried a simple version to check functionality.
problem: widget mapper mapping to property . updates property when model changed , does not update model when property changed. I didn't understand how widget mapper gets property change info.
here is code
class QmDateTimeEdit : public QDateTimeEdit {
Q_OBJECTQ_PROPERTY(uint16_t dateYear READ dateYear WRITE setDateYear NOTIFY dateYearChanged USER true) Q_PROPERTY(uint16_t dateMonth READ dateMonth WRITE setDateMonth NOTIFY dateMonthChanged USER true) Q_PROPERTY(uint16_t dateDay READ dateDay WRITE setDateDay NOTIFY dateDayChanged USER true)public:
explicit QmDateTimeEdit(QWidget* parent = nullptr);uint16_t dateYear() const { return mYear; } uint16_t dateMonth() const { return mMonth; } uint16_t dateDay() const { return mDay; } QDateTime dateTime() const;signals:
void dateYearChanged(const uint16_t& dateYear); void dateMonthChanged(const uint16_t& dateMonth); void dateDayChanged(const uint16_t& dateDay);private slots:
void valueChanged(const QDateTime& dateTime); void setDateTime(const QDateTime& dateTime); void setDateDay(uint16_t dateDay); void setDateYear(uint16_t dateYear); void setDateMonth(uint16_t dateMonth);private:
uint16_t mYear; uint16_t mMonth; uint16_t mDay;};
// when ever valueChanged() occurs i just set 3 values (mYear , mMonth and mDay) and emit 3 signals . I expected this should update the model data but it doesn't.
QmDateTimeEdit::QmDateTimeEdit(QWidget* parent)
: QDateTimeEdit(parent)
{
connect(this, &QDateTimeEdit::dateTimeChanged, this, &QmDateTimeEdit::valueChanged);
}void QmDateTimeEdit::setDateYear(uint16_t dateYear)
{mYear = dateYear; qDebug() << "Year changed" << mYear;}
void QmDateTimeEdit::setDateMonth(uint16_t dateMonth)
{mMonth = dateMonth; qDebug() << "Month changed" << mMonth;}
void QmDateTimeEdit::setDateDay(uint16_t dateDay)
{mDay = dateDay; qDebug() << "Day changed" << mDay << this->parent();}
void QmDateTimeEdit::valueChanged(const QDateTime& dateTime)
{setDateYear(dateTime.date().year()); setDateMonth(dateTime.date().month()); setDateDay(dateTime.date().day()); emit dateYearChanged(dateTime.date().year()); emit dateMonthChanged(dateTime.date().month()); emit dateDayChanged(dateTime.date().day());}
-
You can use
QDataWidgetMapperwith custom delegate.void MyDelegate::setEditorData(QWidget* parent, const QModelIndex& index) const { if (auto dte = qobject_cast<QDateTimeEdit*>(editor); dte) { auto* model = index.model(); const auto& year = model->index(0, 0, index.parent()).data().toString(); const auto& month = model->index(1, 0, index.parent()).data().toString(); // ... QDateTime dt = QDateTime::fromString(/*combine above to QDateTime*/); dte->setDateTime(dt); } }Then map your
QDateTimeEditwithQDataWidgetMapper, set delegate. and voila -
HI @VRonin ,
Model is almost correct small difference is ( date is also broken to a separate child as below)
Parent A
2019
12
25
13
58
15
Wednesday ( this one is not must)And you want it displayed as a list that appears ( not as a list but i want to display and edit using a QDateTimeEdit widget or similar)
2019-12-25 13:58:15 2019-05-30 20:30:55if it is a tree widget or tree view then it is no problem it works directly.( element wise )
proxy , i have read about this and tried to implement but did not succeed( it is easier in a table widget or Tree i think). do you have a example of this to a seperate widget?
Something like this minimal example is what you want or did I miss something?
#include <QApplication> #include <QTreeWidget> #include <QVBoxLayout> #include <QDateTimeEdit> #include <QStandardItemModel> class ExampleWid : public QWidget{ //Q_OBJECT Q_DISABLE_COPY(ExampleWid) public: explicit ExampleWid(QWidget *parent = Q_NULLPTR) :QWidget(parent) ,view(new QTreeView(this)) ,editor(new QDateTimeEdit(this)) { QAbstractItemModel* model = new QStandardItemModel(this); model->insertColumn(0); model->insertRows(0,2); QModelIndex parIdx= model->index(0,0); model->setData(parIdx,QStringLiteral("Parent A")); model->insertColumn(0,parIdx); model->insertRows(0,7,parIdx); model->setData(model->index(0,0,parIdx),2019); model->setData(model->index(1,0,parIdx),12); model->setData(model->index(2,0,parIdx),25); model->setData(model->index(3,0,parIdx),13); model->setData(model->index(4,0,parIdx),58); model->setData(model->index(5,0,parIdx),15); model->setData(model->index(6,0,parIdx),QStringLiteral("Wednesday")); parIdx= model->index(1,0); model->setData(parIdx,QStringLiteral("Parent B")); model->insertColumn(0,parIdx); model->insertRows(0,7,parIdx); model->setData(model->index(0,0,parIdx),2019); model->setData(model->index(1,0,parIdx),5); model->setData(model->index(2,0,parIdx),30); model->setData(model->index(3,0,parIdx),20); model->setData(model->index(4,0,parIdx),30); model->setData(model->index(5,0,parIdx),55); model->setData(model->index(6,0,parIdx),QStringLiteral("Thursday")); view->setModel(model); QVBoxLayout* minLay = new QVBoxLayout(this); minLay->addWidget(editor); minLay->addWidget(view); QObject::connect(view->selectionModel(),&QItemSelectionModel::currentChanged,this,[this](QModelIndex idx)->void{ if(!idx.isValid()) return; while(idx.parent().isValid()) idx =idx.parent(); lastIdx = QPersistentModelIndex(); editor->setDateTime(QDateTime( QDate( idx.model()->index(0,0,idx).data().toInt() ,idx.model()->index(1,0,idx).data().toInt() ,idx.model()->index(2,0,idx).data().toInt() ) , QTime( idx.model()->index(3,0,idx).data().toInt() ,idx.model()->index(4,0,idx).data().toInt() ,idx.model()->index(5,0,idx).data().toInt() ) )); lastIdx = idx; }); QObject::connect(editor,&QDateTimeEdit::dateTimeChanged,this,[this](const QDateTime &datetime)->void { if(!lastIdx.isValid()) return; QAbstractItemModel * model = view->model(); model->setData(model->index(0,0,lastIdx),datetime.date().year()); model->setData(model->index(1,0,lastIdx),datetime.date().month()); model->setData(model->index(2,0,lastIdx),datetime.date().day()); model->setData(model->index(3,0,lastIdx),datetime.time().hour()); model->setData(model->index(4,0,lastIdx),datetime.time().minute()); model->setData(model->index(5,0,lastIdx),datetime.time().second()); model->setData(model->index(6,0,lastIdx),view->locale().toString(datetime.date(),QStringLiteral("dddd"))); }); } private: QTreeView* view; QDateTimeEdit *editor; QPersistentModelIndex lastIdx; }; int main(int argc, char **argv) { QApplication app(argc,argv); ExampleWid wid; wid.show(); return app.exec(); }"La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
~Napoleon BonaparteOn a crusade to banish setIndexWidget() from the holy land of Qt
-
Something like this minimal example is what you want or did I miss something?
#include <QApplication> #include <QTreeWidget> #include <QVBoxLayout> #include <QDateTimeEdit> #include <QStandardItemModel> class ExampleWid : public QWidget{ //Q_OBJECT Q_DISABLE_COPY(ExampleWid) public: explicit ExampleWid(QWidget *parent = Q_NULLPTR) :QWidget(parent) ,view(new QTreeView(this)) ,editor(new QDateTimeEdit(this)) { QAbstractItemModel* model = new QStandardItemModel(this); model->insertColumn(0); model->insertRows(0,2); QModelIndex parIdx= model->index(0,0); model->setData(parIdx,QStringLiteral("Parent A")); model->insertColumn(0,parIdx); model->insertRows(0,7,parIdx); model->setData(model->index(0,0,parIdx),2019); model->setData(model->index(1,0,parIdx),12); model->setData(model->index(2,0,parIdx),25); model->setData(model->index(3,0,parIdx),13); model->setData(model->index(4,0,parIdx),58); model->setData(model->index(5,0,parIdx),15); model->setData(model->index(6,0,parIdx),QStringLiteral("Wednesday")); parIdx= model->index(1,0); model->setData(parIdx,QStringLiteral("Parent B")); model->insertColumn(0,parIdx); model->insertRows(0,7,parIdx); model->setData(model->index(0,0,parIdx),2019); model->setData(model->index(1,0,parIdx),5); model->setData(model->index(2,0,parIdx),30); model->setData(model->index(3,0,parIdx),20); model->setData(model->index(4,0,parIdx),30); model->setData(model->index(5,0,parIdx),55); model->setData(model->index(6,0,parIdx),QStringLiteral("Thursday")); view->setModel(model); QVBoxLayout* minLay = new QVBoxLayout(this); minLay->addWidget(editor); minLay->addWidget(view); QObject::connect(view->selectionModel(),&QItemSelectionModel::currentChanged,this,[this](QModelIndex idx)->void{ if(!idx.isValid()) return; while(idx.parent().isValid()) idx =idx.parent(); lastIdx = QPersistentModelIndex(); editor->setDateTime(QDateTime( QDate( idx.model()->index(0,0,idx).data().toInt() ,idx.model()->index(1,0,idx).data().toInt() ,idx.model()->index(2,0,idx).data().toInt() ) , QTime( idx.model()->index(3,0,idx).data().toInt() ,idx.model()->index(4,0,idx).data().toInt() ,idx.model()->index(5,0,idx).data().toInt() ) )); lastIdx = idx; }); QObject::connect(editor,&QDateTimeEdit::dateTimeChanged,this,[this](const QDateTime &datetime)->void { if(!lastIdx.isValid()) return; QAbstractItemModel * model = view->model(); model->setData(model->index(0,0,lastIdx),datetime.date().year()); model->setData(model->index(1,0,lastIdx),datetime.date().month()); model->setData(model->index(2,0,lastIdx),datetime.date().day()); model->setData(model->index(3,0,lastIdx),datetime.time().hour()); model->setData(model->index(4,0,lastIdx),datetime.time().minute()); model->setData(model->index(5,0,lastIdx),datetime.time().second()); model->setData(model->index(6,0,lastIdx),view->locale().toString(datetime.date(),QStringLiteral("dddd"))); }); } private: QTreeView* view; QDateTimeEdit *editor; QPersistentModelIndex lastIdx; }; int main(int argc, char **argv) { QApplication app(argc,argv); ExampleWid wid; wid.show(); return app.exec(); }@VRonin said in Need help from QT Experts ( Model / View for QDateTimeEdit widget):
view
HI VRonin,
Thank you for your reply. This would work but my model is not a local one , it is set from a different class using a set-model function(example). I need it because the model might change during run time. in this case i need dynamic signal slot right ?. I have a requirement of sessions in my program if a session is changed then the model changes which i have to set it externally.
Thanks and regards
-
Nothing difficult, mine was just an example, just remove everything in the constructor before
QVBoxLayout* minLay = new QVBoxLayout(this);and add a publicvoid setModel(QAbstractItemModel* model){view->setModel(model);}that you can use to set a new model from outside this class. Everything else is all the same -
You can use
QDataWidgetMapperwith custom delegate.void MyDelegate::setEditorData(QWidget* parent, const QModelIndex& index) const { if (auto dte = qobject_cast<QDateTimeEdit*>(editor); dte) { auto* model = index.model(); const auto& year = model->index(0, 0, index.parent()).data().toString(); const auto& month = model->index(1, 0, index.parent()).data().toString(); // ... QDateTime dt = QDateTime::fromString(/*combine above to QDateTime*/); dte->setDateTime(dt); } }Then map your
QDateTimeEditwithQDataWidgetMapper, set delegate. and voilaYes i tried that but when the model data is changed then the signal is not fired , it never comes to this function . why is that ?
QObject::connect(lView->selectionModel(), &QItemSelectionModel::currentChanged, this, [this](QModelIndex idx) -> void { qDebug() << "modelchanged " << idx; } -
Yes i tried that but when the model data is changed then the signal is not fired , it never comes to this function . why is that ?
QObject::connect(lView->selectionModel(), &QItemSelectionModel::currentChanged, this, [this](QModelIndex idx) -> void { qDebug() << "modelchanged " << idx; }I need it because the model might change during run time
Do you mean the whole model is changed, or just one item? If it's the former:
https://doc.qt.io/qt-5/qitemselectionmodel.html#currentChangedNote that this signal will not be emitted when the item model is reset.
and you might mean:
https://doc.qt.io/qt-5/qitemselectionmodel.html#modelChangedThis signal is emitted when the model is successfully set with setModel().
or am I grasping the wrong end of the stick for what you are saying?
-
I need it because the model might change during run time
Do you mean the whole model is changed, or just one item? If it's the former:
https://doc.qt.io/qt-5/qitemselectionmodel.html#currentChangedNote that this signal will not be emitted when the item model is reset.
and you might mean:
https://doc.qt.io/qt-5/qitemselectionmodel.html#modelChangedThis signal is emitted when the model is successfully set with setModel().
or am I grasping the wrong end of the stick for what you are saying?
@JonB Thank you .
sorry i want to correct few things . Your code is working fine with view and set model i have just verified that. The reason it didnt work was i was not displaying my view.
I must not show view to user . i just have to map the model to widget(QDateTimeEdit) and show that widget to user. I thought with view it might work if i dont show this to user. just set everything but not showing. This dont work right? please correct me.I meant both cases. in one case , one child value will be changed in another case a new model is set.I can connect these signals as you mentioned but they work with TreeView when visible right?
-
@JonB Thank you .
sorry i want to correct few things . Your code is working fine with view and set model i have just verified that. The reason it didnt work was i was not displaying my view.
I must not show view to user . i just have to map the model to widget(QDateTimeEdit) and show that widget to user. I thought with view it might work if i dont show this to user. just set everything but not showing. This dont work right? please correct me.I meant both cases. in one case , one child value will be changed in another case a new model is set.I can connect these signals as you mentioned but they work with TreeView when visible right?
@chakry said in Need help from QT Experts ( Model / View for QDateTimeEdit widget):
The reason it didnt work was i was not displaying my view.
I must not show view to user . i just have to map the model to widgetSo how do you decide what parent item of the model should be edited in the widget?
"La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
~Napoleon BonaparteOn a crusade to banish setIndexWidget() from the holy land of Qt
-
@chakry said in Need help from QT Experts ( Model / View for QDateTimeEdit widget):
The reason it didnt work was i was not displaying my view.
I must not show view to user . i just have to map the model to widgetSo how do you decide what parent item of the model should be edited in the widget?
@VRonin parent has a name , which is fixed. I will find it based on the name. The respective Model index is used unless a new model is updated.
just a bit more explanation to be clear. I have a tree model and all these elements/children in tree model should be shown in view as a widget easily editable( ex: text box, checkbox, combobox, spinbox ..etc) . These standard items are working using widget mapper. I search for a parent and map its model index to one of the these standard widgets. In this model i also have 6 children's having date ,time info. I wanted to map these 6 children's to a single widget datetimeedit. This was my main issue . This is not possible with restriction on datawidgetmapper ( only one property can be mapped ).
thanks and regards.
-
@VRonin parent has a name , which is fixed. I will find it based on the name. The respective Model index is used unless a new model is updated.
just a bit more explanation to be clear. I have a tree model and all these elements/children in tree model should be shown in view as a widget easily editable( ex: text box, checkbox, combobox, spinbox ..etc) . These standard items are working using widget mapper. I search for a parent and map its model index to one of the these standard widgets. In this model i also have 6 children's having date ,time info. I wanted to map these 6 children's to a single widget datetimeedit. This was my main issue . This is not possible with restriction on datawidgetmapper ( only one property can be mapped ).
thanks and regards.
@chakry said in Need help from QT Experts ( Model / View for QDateTimeEdit widget):
I wanted to map these 6 children's to a single widget datetimeedit. This was my main issue . This is not possible with restriction on datawidgetmapper ( only one property can be mapped ).
This is what the code in my 2
connectdo:
This puts an index inside theQDatetimeEditif(!idx.isValid()) return; while(idx.parent().isValid()) idx =idx.parent(); lastIdx = QPersistentModelIndex(); editor->setDateTime(QDateTime( QDate( idx.model()->index(0,0,idx).data().toInt() ,idx.model()->index(1,0,idx).data().toInt() ,idx.model()->index(2,0,idx).data().toInt() ) , QTime( idx.model()->index(3,0,idx).data().toInt() ,idx.model()->index(4,0,idx).data().toInt() ,idx.model()->index(5,0,idx).data().toInt() ) )); lastIdx = idx;This puts the data from the
QDatetimeEditback into the modelif(!lastIdx.isValid()) return; model->setData(model->index(0,0,lastIdx),datetime.date().year()); model->setData(model->index(1,0,lastIdx),datetime.date().month()); model->setData(model->index(2,0,lastIdx),datetime.date().day()); model->setData(model->index(3,0,lastIdx),datetime.time().hour()); model->setData(model->index(4,0,lastIdx),datetime.time().minute()); model->setData(model->index(5,0,lastIdx),datetime.time().second()); model->setData(model->index(6,0,lastIdx),view->locale().toString(datetime.date(),QStringLiteral("dddd")));"La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
~Napoleon BonaparteOn a crusade to banish setIndexWidget() from the holy land of Qt
-
@chakry said in Need help from QT Experts ( Model / View for QDateTimeEdit widget):
I wanted to map these 6 children's to a single widget datetimeedit. This was my main issue . This is not possible with restriction on datawidgetmapper ( only one property can be mapped ).
This is what the code in my 2
connectdo:
This puts an index inside theQDatetimeEditif(!idx.isValid()) return; while(idx.parent().isValid()) idx =idx.parent(); lastIdx = QPersistentModelIndex(); editor->setDateTime(QDateTime( QDate( idx.model()->index(0,0,idx).data().toInt() ,idx.model()->index(1,0,idx).data().toInt() ,idx.model()->index(2,0,idx).data().toInt() ) , QTime( idx.model()->index(3,0,idx).data().toInt() ,idx.model()->index(4,0,idx).data().toInt() ,idx.model()->index(5,0,idx).data().toInt() ) )); lastIdx = idx;This puts the data from the
QDatetimeEditback into the modelif(!lastIdx.isValid()) return; model->setData(model->index(0,0,lastIdx),datetime.date().year()); model->setData(model->index(1,0,lastIdx),datetime.date().month()); model->setData(model->index(2,0,lastIdx),datetime.date().day()); model->setData(model->index(3,0,lastIdx),datetime.time().hour()); model->setData(model->index(4,0,lastIdx),datetime.time().minute()); model->setData(model->index(5,0,lastIdx),datetime.time().second()); model->setData(model->index(6,0,lastIdx),view->locale().toString(datetime.date(),QStringLiteral("dddd")));@VRonin said in Need help from QT Experts ( Model / View for QDateTimeEdit widget):
@chakry said in Need help from QT Experts ( Model / View for QDateTimeEdit widget):
I wanted to map these 6 children's to a single widget datetimeedit. This was my main issue . This is not possible with restriction on datawidgetmapper ( only one property can be mapped ).
Thank you VRonin for helping
This is what the code in my 2connectdo:
This puts an index inside theQDatetimeEdit```
( Its true but where should i add this code , view and selectionmodel as you mentioned before doesnot work as there is no view in my case , any suggestion where to keep this )> ```cpp > if(!idx.isValid()) > return; > while(idx.parent().isValid()) > idx =idx.parent(); > lastIdx = QPersistentModelIndex(); > editor->setDateTime(QDateTime( > QDate( > idx.model()->index(0,0,idx).data().toInt() > ,idx.model()->index(1,0,idx).data().toInt() > ,idx.model()->index(2,0,idx).data().toInt() > ) > , QTime( > idx.model()->index(3,0,idx).data().toInt() > ,idx.model()->index(4,0,idx).data().toInt() > ,idx.model()->index(5,0,idx).data().toInt() > ) > )); > lastIdx = idx; > ``` > > This puts the data from the `QDatetimeEdit` back into the model ``` **( This works as in this case i use dateTimechanged from QDateTimeEditsignal and set the passed model data)**if(!lastIdx.isValid()) return; model->setData(model->index(0,0,lastIdx),datetime.date().year()); model->setData(model->index(1,0,lastIdx),datetime.date().month()); model->setData(model->index(2,0,lastIdx),datetime.date().day()); model->setData(model->index(3,0,lastIdx),datetime.time().hour()); model->setData(model->index(4,0,lastIdx),datetime.time().minute()); model->setData(model->index(5,0,lastIdx),datetime.time().second()); model->setData(model->index(6,0,lastIdx),view->locale().toString(datetime.date(),QStringLiteral("dddd")));
