Need Help Creating Editor App

I would create four active objects which represent your four buttons in the corners. When you click on an object, you would position each button to each corner of the object. I believe you can retrieve the X and Y coordinates of the left and right edge of the active. If not, you can always position it at the top left corner using the regular X and Y coordinates then add the width or height of the active to get the other corner coordinates.

So once you click on the object the four actives should now appear in the corners. I would also create a condition to test if the user clicks on the screen and is not overlapping an object to hide the four buttons. If you add all of your creatable objects in a qualifier group, you only have to test against that one group instead of every object in your program. You can negate conditions to have them trigger when the opposite is true. For example if you have a "user mouse over active" condition you could right click that condition and negate it so it would trigger when its not over the active. Then add a condition to test for the click. For the action you could just position the buttons off screen. I wouldn't make them invisible because they still might be interacted with.

Then you would start creating the associated actions that go along with each button. You can use the "scale" feature under "Angle/Scale" for active objects to make them larger or smaller. You could do something along the lines of saving the current position of the mouse before scaling it then testing it against the current position of the mouse to see if the user is dragging it to be larger or smaller. Then you could scale the object depending on the distance between those two points or something. You would have to tweak it to make it work correctly, but that's a general idea.

For the rotate button you can use the "Angle" action to rotate it however many degrees you want.

For the X button, I'm assuming that's delete? You can just delete the object.

I think the triangle thing is flip? I'm not sure how to do that, but there's probably some way you can do it.

Just use the "Flip Horizontally" or "Flip Vertically" effects.

String object doesn't have alterable values. If you want alterable values, you may try using Active System Box which has those.