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How to Develop a Calendar Widget.

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  • Z Offline
    Z Offline
    ZapB
    wrote on 20 Apr 2011, 11:55 last edited by
    #107

    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.

    Nokia Certified Qt Specialist
    Interested in hearing about Qt related work

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    • G Offline
      G Offline
      goetz
      wrote on 20 Apr 2011, 12:04 last edited by
      #108

      [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?

      http://www.catb.org/~esr/faqs/smart-questions.html

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      • B Offline
        B Offline
        BorahAnshuman
        wrote on 20 Apr 2011, 12:19 last edited by
        #109

        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

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        • I Offline
          I Offline
          imrrk
          wrote on 20 Apr 2011, 12:26 last edited by
          #110

          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..

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          • Z Offline
            Z Offline
            ZapB
            wrote on 20 Apr 2011, 12:39 last edited by
            #111

            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
            {
            ...
            };
            @

            Nokia Certified Qt Specialist
            Interested in hearing about Qt related work

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            • B Offline
              B Offline
              BorahAnshuman
              wrote on 20 Apr 2011, 12:48 last edited by
              #112

              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

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              • Z Offline
                Z Offline
                ZapB
                wrote on 20 Apr 2011, 12:53 last edited by
                #113

                [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++.

                Nokia Certified Qt Specialist
                Interested in hearing about Qt related work

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                • B Offline
                  B Offline
                  BorahAnshuman
                  wrote on 20 Apr 2011, 13:13 last edited by
                  #114

                  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

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                  • Z Offline
                    Z Offline
                    ZapB
                    wrote on 20 Apr 2011, 13:21 last edited by
                    #115

                    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.

                    Nokia Certified Qt Specialist
                    Interested in hearing about Qt related work

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                    • B Offline
                      B Offline
                      BorahAnshuman
                      wrote on 20 Apr 2011, 13:35 last edited by
                      #116

                      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

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                      • D Offline
                        D Offline
                        DenisKormalev
                        wrote on 20 Apr 2011, 13:37 last edited by
                        #117

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

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                        • Z Offline
                          Z Offline
                          ZapB
                          wrote on 20 Apr 2011, 13:41 last edited by
                          #118

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

                          Nokia Certified Qt Specialist
                          Interested in hearing about Qt related work

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                          • Kiran KumarK Offline
                            Kiran KumarK Offline
                            Kiran Kumar
                            wrote on 15 Dec 2016, 11:21 last edited by
                            #119

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

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