How to Develop a Calendar Widget.

imrrk

i have reffered and know the logic,just want to do it in different way,hey can u tell me the default qcalendar widget in deesigner can be used in a efficient way..

ZapB

What do you mean by "efficient way"? Just drop it on your form and hook up to it's signals. I am not clear exactly what you are trying to achieve. Do you have a graphic mockup of what you are after and a list of features?

giesbert

Hi imrrk,

as already told many times, and now last time:

make a derived class for what you described. Make a

@
class MyCalendarWidget : public QCalendarWidget
@

there change the mouse handling, change the drawing and you have what you need.
Then build up your UI on top of that.

goetz

[quote author="imrrk" date="1302268936"]i have reffered and know the logic,just want to do it in different way,hey can u tell me the default qcalendar widget in deesigner can be used in a efficient way..[/quote]

How should we know if it fits your needs? What a strange question...

How about just getting your hands dirty and trying it? In the time you wrote all this comments you could have ended up with a prototype showcase.

imrrk

Hello friends,
I have taken an taken an inbuilt QCalendarwidget and written a slot ,here when i click on dates i get the same date on the textbrowser.below is my code.
dialog.cpp

@#include "dialog.h"
#include "ui_dialog.h"
#include<QCalendarWidget>
#include<QDate>

Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
QCalendarWidget *cal=new QCalendarWidget();
cal->setDateEditEnabled(1);
cal->setFirstDayOfWeek(Qt::Wednesday);

cal->show();
}

Dialog::~Dialog()
{
delete ui;
}

void Dialog::on_calendarWidget_clicked(QDate date)
{
ui->textBrowser->setText(date.toString());

}

@
i know its simple,but i want to know whether in a similar way,we can open a new dialog on clicking a date....?

andre

Sure. In your on_calendarWidget_clicked(QDate date), you do something like this:

@
void Dialog::on_calendarWidget_clicked(QDate date)
{
MyFancyDialog dlg(this); // MyFancyDialog is derived from QDialog
dlg.setDateToWorkWith(date); // I guess the dialog needs to do something with the date
if (dlg.exec() == QDialog::Accepted) { // this will make the dialog modal

    //now do something with the results
    //you can give MyFancyDialog member functions to access the resulting data
}

}
@

imrrk

hi andre,
i opened a new dialog with the below code:
@void Dialog::on_calendarWidget_clicked(QDate date)
{
Dialog1 a(this);
a.show();
a.exec();
}@
hey
dlg.setDateToWorkWith(Date).whether its in built function?,because i didnt find it..

and one more thing ,i want to know can we change the color of cells ?

ZapB

You have to write your own custom dialog that inherits QDialog. How on earth is Qt supposed to ship a dialog already tailored to your precise needs? Andre just made that function name up as an example.

andre

[quote author="imrrk" date="1302591858"]hi andre,
i opened a new dialog with the below code:
@void Dialog::on_calendarWidget_clicked(QDate date)
{
Dialog1 a(this);
a.show();
a.exec();
}@
hey
dlg.setDateToWorkWith(Date).whether its in built function?,because i didnt find it..[/quote]
Eh, what do you think? I make up an obviously fake dialog name with an obviously fake method name, and you expect that to be in Qt by default. And what should that method do then, exactly? Also: there is no need to call both show() and exec(). Either one will suffice.
[quote]
and one more thing ,i want to know can we change the color of cells ?[/quote]
You mean of your calendar widget, right? Perhaps you could read the documentation of the QCalendarWidget? I just did, and found what you need in less than ten seconds.

imrrk

Hello Andre,you r really mistaken,I didnt say that u r fake dialog name should work,I know that,its just an example to understand,I was just asking about the setDateToWorkwith(Date) thats it..
and its great that you have found out it in tensecs..I will also try and will get back to you..

Thanks
imrrk

andre

Problem is, you did not say what you would like to use the date for in your dialog, so how should we know how that method should look? Let alone, how would the Qt developers a couple of years ago have known?

It could be as simple as this:
@
void MyFancyDialog::setDateToWorkWith(QDate date) //you might want to think of a better name than this...
{
//m_ui is a member pointer to your UI class instance
//your .ui has a QLabel on it called "dateLabel"
m_ui->dateLabel->setText(date.toString(Qt::SystemLocaleLongDate));
}
@

But perhaps your dialog has to do something way more fancy with the date than that. Since you did not tell us, it is hard to give a better example.

imrrk

Ok,andre I apologize for that,but andre,my question of concern is that,suppose I will give one example here,suppose in a month of 30 or 31 or 28 days ,suppose it will rain on 5 days,and other 5 days it will be hot,another 5 days it will be very cold ,,,and so..on..So suppose the user selects one of the date and he wants to know the above statics,then what should happen is that,all the above climatic conditions should be represnted as different colors on date,the colors should get set on dates depending on the climatic condition...i.e is rain-blue,hot-red,cold-green and so on..so whether this is possible..

thanks
imrrk

andre

Yes, of course that is possible, but that is something different again than what you asked before about using a separate dialog, and what that dialog is supposed to do. Now, you are talking about styling the QCalendarWidget again. Did you take a look at the documentation of that class yet? Did you find out how you can style the display of a specific date?

Edit:
Just to proof that I am not bulshitting you about that this is perfectly possible with QCalendarWidget, I put this example together:

!http://dl.dropbox.com/u/16442531/coloredCalendar.png(Colored calendar example)!

This is what you were after, right?

giesbert

Hi imrrk,

that is all up to you and your application.
You asked about how to handle the click on a calendar date and how to open a dialog. You got the answers. We will not write your application. A little bit is also up to you.

The general info on how to react on a calendar click and to open a dialog was given.

ZapB

Maybe the best thing you could do would be to draw a mockup of what you are trying to achieve so that we can all see it. You seem to keep changing your mind every 3rd post or so.

giesbert

[quote author="Andre" date="1302601186"]Yes, of course that is possible, but that is something different again than what is supposed to be in a separate dialog, and what that dialog is supposed to do. Now, you are talking about styling the QCalendarWidget again. Did you take a look at the documentation of that class yet? Did you find out how you can style the display of a specific date?[/quote]

Styling the calndar items can only be done by subclassign QCalendarWidget and by overwriting

virtual void paintCell(QPainter* pPainter, const QRect& rCellRect, const QDate& rDate) const;

andre

[quote author="Gerolf" date="1302601571"]
[quote author="Andre" date="1302601186"]Yes, of course that is possible, but that is something different again than what is supposed to be in a separate dialog, and what that dialog is supposed to do. Now, you are talking about styling the QCalendarWidget again. Did you take a look at the documentation of that class yet? Did you find out how you can style the display of a specific date?[/quote]

Styling the calndar items can only be done by subclassign QCalendarWidget and by overwriting

virtual void paintCell(QPainter* pPainter, const QRect& rCellRect, const QDate& rDate) const;
[/quote]

Untrue. The sample I posted above was done without subclassing QCalendarWidget.

imrrk

Thanks Andre,for ur valuable information,but whether we should use paintcell function or no..if not which function to use..to achieve it..

thanks
imrrk

andre

[quote author="imrrk" date="1302603498"]Thanks Andre,for ur valuable information,but whether we should use paintcell function or no..if not which function to use..to achieve it..
[/quote]
You really couldn't find the methods in QCalendarWidget that control the format? The "Format" in the method name did not give the function away? And you also did not see this piece of text in the documentation?
[quote]The rendering of the headers, weekdays or single days can be largely customized by setting QTextCharFormat's for some special weekday, a special date or for the rendering of the headers.[/quote]
Note that there are several methods that allow you to set a QTextCharFormat (with similar names), but this is the code I used to create the image I posted above:

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

//initialize the formats used
QTextCharFormat coldDate;
coldDate.setBackground(Qt::blue);
QTextCharFormat hotDate;
hotDate.setBackground(Qt::red);
QTextCharFormat wetDate;
wetDate.setBackground(Qt::green);
QTextCharFormat yellowDate;
yellowDate.setBackground(Qt::yellow);

//set the dates and the format to use for them
ui->calendar->setDateTextFormat(QDate(2011, 4,  1), coldDate);
ui->calendar->setDateTextFormat(QDate(2011, 4, 13), wetDate);
ui->calendar->setDateTextFormat(QDate(2011, 4, 21), wetDate);
ui->calendar->setDateTextFormat(QDate(2011, 4, 27), hotDate);
ui->calendar->setDateTextFormat(QDate(2011, 4,  6), yellowDate);
ui->calendar->setDateTextFormat(QDate(2011, 4, 28), hotDate);

}
@

Obviously, this being a very simple prototype, I simply hard-coded some random dates for this month with some formats. In a real application you'd get the relevant information from somewhere else, and populate the calendar based on that for the dates that are currently visible.

imrrk

Thank you very much andre...