How to Develop a Calendar Widget.

ZapB

What are you doing? To get custom painting do this:

Derive a class from QCalendarWidget

Reimplement the paintCell() protected virtual function to do you custom painting

Use your custom class in your app instead of QCalendarWidget

When you reimplement the paintCell() function I suggest you make the changes from the base class version very incrementally so that you can see what the changes do and learn as you go along.

goetz

[quote author="BorahAnshuman" date="1303294092"]Hello Volker

as per ur suggestion i hv read QPainter class in QT..as per ur discussion i hv tried this code in setting backgroundImage in a particular cell in CalenderWidget but an error occur..cn u please check the error..

regards
Anshuman[/quote]

What was so unclear about my last statement?

[quote author="Volker" date="1303212502"]
You (in plural or singular meaning - choose whatever you want) may ask, but don't expect any further answers. I step out too.[/quote]

Are you trying to troll me?

BorahAnshuman

hello ZapB

Actually i inherit Qdialog and QCalenderWidget class..now when i build my app the following error ocurrs...can anyone suggest me why is occur..

Error r....

Rquest for member show() is ambiguous //show in main .cpp

the code i hv wrritten is:

@class PainterApp : public QDialog,public QCalendarWidget
{
Q_OBJECT

public:
explicit PainterApp(QWidget *parent = 0);
~PainterApp();

private:
Ui::PainterApp *ui;
};
@
@void PainterApp::paintCell(QPainter * painter, const QRect & rect, const QDate & date ) const{

QRectF target(30.0, 40.0, 80.0, 60.0);
QRectF source(30.0, 40.0, 70.0, 40.0);
QImage image("C:/QTWork/back-icon.png");


painter->drawImage(target, image, source);
ui->calendarWidget->paintCell(painter,rect,date.currentDate());

}@
with reagrds
Anshuman

imrrk

hello anshuman
bq. class PainterApp : public QDialog,public QCalendarWidget

this should in this way
class PainterApp : public QDialog,public Ui::Dialog//name of your form..

ZapB

That's because you are trying something that is not allowed and makes no sense when you think about it. The calendar widget will be shown within a dialog. The calendar widget is not a dialog. So use composition not inheritcance for the dialog aspect.

@
class MyCalendarWidget : public QCalendarWidget
{
...
protected:
virtual void paintCell(QPainter* painter, const QRectF& rect, const QDate& date)
{
// Do custom painting here!!! See base class for default implementation and ideas
}
};

...
...
...

class MyDialog : public QDialog
{
...
};
@

BorahAnshuman

Hello ZapB

thanks for ur reply..

Actually when i use the code like that

class PainterApp : public QDialog,public Ui::Dialog//name of your form..

than error is

// invalid use of incomplete type struct Ui::PainterApp//my form name come..

and one more thing i hv calender widget present in QtDesigner..which means i havent create my own custom calender..

regards
Anshuman

ZapB

[quote author="BorahAnshuman" date="1303303682"]Hello ZapB
and one more thing i hv calender widget present in QtDesigner..which means i havent create my own custom calender..
[/quote]

So do what I suggested and create one. You cannot override the paintCell() function if you do not have a sub-class of QCalendarWidget can you? This is basic C++.

BorahAnshuman

ok ZapB I am sending my code u please check it..now no error signifies but nothing display in the cell..

@namespace Ui {
class PainterApp;
}
class MyCalendarWidget : public QCalendarWidget
{
private:
Ui::PainterApp ui;
protected:
virtual void paintCell(QPainter painter, const QRectF& rect, const QDate& date);

};
class PainterApp : public QDialog
{
Q_OBJECT

public:
explicit PainterApp(QWidget *parent = 0);
~PainterApp();

private:
Ui::PainterApp *ui;
private slots:

};@

@#include "painterapp.h"
#include "ui_painterapp.h"

PainterApp::PainterApp(QWidget *parent) :
QDialog(parent),
ui(new Ui::PainterApp)
{
ui->setupUi(this);

}
void MyCalendarWidget::paintCell(QPainter* painter, const QRectF& rect, const QDate& date)
{

rect(30.0, 40.0, 80.0, 60.0);
QImage image("C:/QTWork/back-icon.png");


painter->drawImage(rect, image, rect);
ui->calendarWidget->paintCell(painter,rect,date.currentDate());

}
@

regards
Anshuman

ZapB

A few issues for you to consider/fix:

Whay are your trying to change the rect passed into the paintCell() call. This is setup to tell you where to draw by the base class. Do not change it.

Why are you trying to include the ui for something totally unrelated into your sub-class of QCalendarWidget?

It seems you have no conceptual idea of how Qt widgets, dialogs, ui files etc relate to each other. I respectfully suggest that you go work through some of the many examples and tutorials shipped with Qt.

BorahAnshuman

hi Zapb

Actually i am new in Qt..more ever all of other people are new in Qt..so no one was there to guide me..ok i will..if u dont mind can u sent some material regarding Qt..actually i hv go through the documentation but it difficult to understand..

if possible u can send me some material regarding Qt i my email address
borah.anshu@gmail.com

with regards
Anshuman

DenisKormalev

Qt Documentation and examples shipped with Qt are the best docs and materials for learning Qt I think.

ZapB

Launch the qtdemo application. Find an example that interests you. Launch it and then read the docs about it.

Kiran Kumar

You can reffer to this link as an example http://doc.qt.io/qt-5/qtwidgets-widgets-calendarwidget-example.html