How to know we are in Display Mode or Edit Mode

Hi experts

I'm changing a web dynpro (/SAPSRM/WDC_DODC_SC_I_BD) and I need to know if I'm in Display Mode or Edit Mode. Which classe can I use? I know OSS note 1334202 but it does not interest me, because I don't want to get current action (like sy_ucomm) but I want to get current mode (like IV_MODE in Badi BBP_DOC_CHANGE).

Thank you for your help.

Regards,

Peggy.