Adding item to GridLayout???

[Kapil]

Hi..

I have created a canvas and have given it a grid layout... Now i want to add items to it...

But the addItem() function takes a QLayoutItem to be added..
I want to add a Q3CanvasLine object to the first row and column but am not able to do so...

How do i do that.. i tried to create a QLayoutItem with a QCanvasLine object but it wasn't created.. what is the procedure to do it...

Thanking you,

with regards,
Kapil

[munna]

I don't think you can add a canvas item to a layout.

[Kapil]

I don't think you can add a canvas item to a layout.

But i was able to sucessfully set up grid layout for the canvas... and its returning the rowCount and columnCount as well...

can't there be any way in which i can typecast my canvasitem to layoutitem and then add it?????

[wysota]

No. Canvas doesn't work that way. It doesn't use layouts.

[Kapil]

No. Canvas doesn't work that way. It doesn't use layouts.

Aaahhhhhh

Thanks for the reply...

Is there any way to work like a layout works... i.e. while creating items i want them to specify them in a particular region.. like a rectangular region which would contain set of items independent from the other regions... i can work on these group of items in a particular rectangular region as a whole.. like moving the entire region to other part..
or like making a copy of the entire region and repeating it multiple times (like normal copy and paste types)...

is there any way out for this ?????

[wysota]

Try with an article on Qt Quarterly -- Canvas Item Groupies.

[Kapil]

Hey...

Thanks a lot.. it was able to group similar elements together and now i can act on them as a whole single item...

One problem is still there.. to perform the copy and paste task, i.e. to create multiple instances of the object and then place them one after another on the canvas... what i did was that i copied the object information into another object and tried to place it.. but now it is just overwriting it on the current location.. now it contains the same pixel information and is overwriting it... How do i change that information to new location information ????

How do i perform the copy n paste task ???

Should i put in the code of mine which i wrote to perform the copy n paste to make it more clear????

[wysota]

One problem is still there.. to perform the copy and paste task, i.e. to create multiple instances of the object and then place them one after another on the canvas... what i did was that i copied the object information into another object and tried to place it.. but now it is just overwriting it on the current location.. now it contains the same pixel information and is overwriting it... How do i change that information to new location information ????

Maybe you should just... move it?

How do i perform the copy n paste task ???

I believe this topic is widely described in the documentation.

[Kapil]

Maybe you should just... move it?

moving it, shifts the group to some other part of the canvas... but does not replicate it...
i want to create many copies of it all over the place...

I went thru the doc carefully.. but it talked abt adding,moving,deleting, merging.... It tells me to create a group by clubbing the elemnts but does not tell me to recreate elements from that group at different location...

that is the problem which is there...

sorry, but any function of CanvasGroup class in the doc was not able to give me a bit of info on how to perform copy and paste on a group of elements...

Thanks,

Kapil

[wysota]

sorry, but any function of CanvasGroup class in the doc was not able to give me a bit of info on how to perform copy and paste on a group of elements...

I wasn't talking about canvas group. I was talking about clipboard mechanisms present in Qt. If you paste a group, you naturally have to make a copy of each element in it as new instances, make a new group and insert those elements in the group. All according to the mime information present in the clipboard object.

[Kapil]

hi..

i went through the documentation of QClipboard, QMimeData and QByteArray...
as per what i understood this is what i have to do..

CanvasGroup *canvasgp = new CanvasGroup;
//Then i create the entire group
QByteArray *barr = new QByteArray(1);
barr[0] = canvasgp;
QMimeData *mime = new QMimeData;
mime->setData("Canvas Group",&barr);
clipboard->setMimeData(mime,mode);

is this approach correct.. basically this is first time i am dealing with it and as well learning all these concepts as you know.. so i might seem to make disasterous mistakes as well..
sorry for asking you so many questions..

Thanks,
Kapil