[SOLVED] Font in StringGrid: cannot set different fonts per cell

[paxnet_be]

Hello guys,

In the attached project, I created an enhanced stringgrid with an associated object containing custom cell properties and a popup menu to change these cell properties.

Changing the color for each cell works perfectly. Changing the font for one cell works also well, but when I change the font for another cell, this change is also applied for all preceding changed cells instead of only the selected cell.

How can I solve this problem?

--------------
Lazarus 4.4 (rev lazarus_4_2-103-g98f9c7a7a1) FPC 3.2.2 x86_64-linux-gtk2

[jamie]

Use OnPrepairCanvas and set the font there beore each cell gets drawn

[paxnet_be]

Thank you for reply, Jamie.

I tought, that is what I do:

- The contextmenu procedure MIChangeFontPropsClick set the font in the property HighlightedCellFont.
- The at runtime event TableGridPrepareCanvas calls the property HighlightedCellFont.

I removed InvalidateCell() in MIChangeFontPropsClick... Same result.

[paweld]

TFont is a class, so a simple assignment creates a pointer to the original class, and changing it affects all instances.
Therefore, you must create a new instance of the class for each cell.
Additionally, TStringGrid has an Objects property, so you don’t need to implement your own workarounds.
I’ve implemented both changes and handled the update for selected cells - see the attachment.

[paxnet_be]

Thank you, paweld.

This is what I needed, it works, and best of all, you improved it and I learned a lot more about grids ! 

paxnet_be