QGraphicsLayout - same widths and heights for all cells, two items in the same cell

[Palmik]

Hi. I got a class sub-classing QGraphicsSvgItem and QGraphicsLayoutItem so it should be possible to add this item to QGraphicsLayout, right?
Now, I trying to figure how to create a grid layout where the cells are stretching (like in normal QGridLayout or QGraphicsGridLayout) but but all cells are squares. I would take the widest column or highest row and resize all rows and columns accordingly. Would that be somehow possible? If yes, how? I thought I would just subclass QGraphicsGridLayout and during each resize I would find the widest column or highest row and adjust width and height of the remaining columns and rows. However I did not find a way to get the actual width or height of the column or row respectively.
Another thing I would like to achieve with this layout is possibility to place more items into one cell - would that be somehow possible? If yes, how (briefly)? Or how would you imitate it. Again, I thought I would subclass QGraphicsItem create two QGraphicsGridLayouts as members (since I will only require 2 items at max on top of each other) do the resizing as I said in the first paragraph and than place the two layouts on top of each other (if possible) which should imitate the look of two overlapping items.
Thanks in advance.

[Lykurg]

Some hints:

• use QGraphicsGridLayout::setColumnMaximumWidth() and QGraphicsGridLayout::setColumnMinimumWidth() with the same witdh and you have a fix width. Or for that better ust QGraphicsGridLayout::setColumnFixedWidth().
• same with QGraphicsGridLayout::setRowMaximumHeight() ...

Two items in one cell is not possible but you can nest layouts.

[Palmik]

Well, I do not want the width to be fixed, I want it to stretch.
This is how normal QGraphicsGridLayout would look like

And this is how my layout would look like in this case - it would of course change if the view was resized.


I will look into nesting layouts and see if it could help me, thank you
Edit: I'm not sure if I got "nested layouts" right but does not that mean that I just put one layout into another's cell? If so, than thats is probably not what I could use here. :/

[Lykurg]

Well as I understand you you want a "fix" layout till a cell changes its size. If you get notice of a geometry change, reset the "fix" size or only set the minimum size to get grid with same cell boundings.

May be you provide a fast image mocup what you understand by "to place more items into one cell". Because if you put more items in one cell you have to lay them out => use a layout. And then you have a layout in a layout => nested layout.

[Palmik]

Yeah, I could do that with fix size... but, how do I get the widths of the columns or rows to determine which one is the widest?
Here is the image mockup

This is how my grid layout with 2 columns and 1 row would look like.
There are 3 items total inside

1. Blue square with yellow borders in 0, 0
2. Blue square with yellow borders in 1, 0
3. Green circle in 0, 0 - as you can see it's not above the square nor below, etc. it's overlapping the square.

[Lykurg]

Yeah, I could do that with fix size... but, how do I get the widths of the columns or rows to determine which one is the widest?

QGraphicsGridLayout::itemAt() => QGraphicsLayoutItem::geometry()

Here is the image mockup

This is how my grid layout with 2 columns and 1 row would look like.
There are 3 items total inside

1. Blue square with yellow borders in 0, 0
2. Blue square with yellow borders in 1, 0
3. Green circle in 0, 0 - as you can see it's not above the square nor below, etc. it's overlapping the square.

Ah, you are talking about graphic items not layout items... So there is no problem: arrange the three items in a QGraphicsItemGroup, then they behave like one item.

[Palmik]

QGraphicsGridLayout::itemAt() => QGraphicsLayoutItem::geometry()

You are right, that should do it

Ah, you are talking about graphic items not layout items... So there is no problem: arrange the three items in a QGraphicsItemGroup, then they behave like one item.

This should work
I have one more and hopefully last question. If I create QGraphicsItemGroup of 2 items which are inheriting both from QGraphicsSvgItem and QGraphicsLayoutItem (which should give it the capabily to be added to QGraphicsLayouts) I will have to reimplement the QGraphicsItemGroup so that it inherits from QGraphicsLayoutItem as well to be able to add it to QGraphicsLayout, would not I (not that it would much of a problem... but still )?