Change button color on press

[bffonseca]

Greetins,

I am trying to make a button that, when pressed, changes the color to a slightly darker color and then back to the normal color. Much like the cmd_keys work when pressed.

Is there any way to achieve this? I can't seem to find this information anywhere.

The cmd_button is not doing this effect, even with the 3D option on.

[jamesbowman]

Yes, you can use to choose the color of the button, so doing:

cmd_fgcolor(0xff0000);

makes the button draw in red, for example.

The "selftest" example included with the library does what you describe this when it displays the digits 0-9:

github.com/jamesbowman/gd2-lib/blob/master/examples/selftest.ino#L371-L392

[bffonseca]

Apr 21, 2019 5:51:56 GMT -8 jamesbowman said:

Yes, you can use to choose the color of the button, so doing:

cmd_fgcolor(0xff0000);

makes the button draw in red, for example.

The "selftest" example included with the library does what you describe this when it displays the digits 0-9:

github.com/jamesbowman/gd2-lib/blob/master/examples/selftest.ino#L371-L392

Thanks! That helped.

Is there any way to update just one specific zone of the screen (the button in this case), or do I have to redraw the whole frame with the new (pressed) button using swap()?

[jamesbowman]

Cool.

Yeah, that's the EVE way, you have to redraw everything every frame. Drawing everything is not as heavyweight as it sounds though, because the MCU is only sending a couple of hundred bytes over SPI. On a puny Arduino, for example, the redraw rarely takes over 1ms.