WoW:How the user interface is rendered: Difference between revisions

Within a frame, there are several draw layers, e.g. background, artwork, overlay, which can contain textures and fontstrings. Within a single draw layer, textures are rendered first, and then fontstrings are rendered afterwards, so text always shows above textures within a single draw layer. Other than that, there is no defined render order, so if you have two overlapping textures in the same draw layer, you never know which will overlap the other.

Only frames can get mouse events, and then only if they have mouse event handlers or are frame types which are clickable (buttons). The mouse focus goes to the frame which is registered for mouse events with the highest strata and the highest frame level under the cursor.