Here's a step by step guide. It's possible but a bit convoluted.
1) Place your frames/PICs in a consecutive spot in the catalog (no empty in-between frames). It's adviced to start at a slot higher than 11. You can use Rend2Frame if you want to create animations.
2) Place animation event, set first frame and last frame
3) Set the Picture animator dropdown to Animator instead of Frame
4) Click the Animator... button
5) Set to Expression and give in this expression:
Code:
numFrames = 5; //change this to amount of frames in animation
if(keyboard(37)*(1-equal(keyboard(37),a)), assign(pos, pos-1), 0); //detect arrow key hits
if(keyboard(39)*(1-equal(keyboard(39),b)), assign(pos, pos+1), 0);
a = keyboard(37); //use a and b to only detect the moment at which the keys are pressed
b = keyboard(39); //instead of looping continuously
pos = min(max(pos, 0), numFrames-1); //constrain pos to 0..numFrames-1
result=pos/(numFrames-1) //remap position to a value between 0 and 1
6) This uses the left and right arrow buttons to go through the animation. If you want to change these keys, click Expr. Help and scroll down to the bottom. Find the two keys you want to use and their code number and change the keyboard() arguments to their value (keyboard(37) is left arrow, keyboard(39) is right arrow).
7) Change numFrames = # to the amount of frames # in the animation.