Browsing tevo/widget at commit 1d84452255fa2d3c41ac2596f39d61d7e3b27b12: /CONVENTIONS

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• widgets that encapsulate other widgets:
	- take ownership (responsible for freeing, etc)
	- are responsible for ensuring their subwidgets don't stomp all over the screen
• widgets should make sure global state is consistent with how it was when their functions were invoked (i.e. if you touch screen->clipr, restore it before returning, etc)
• Widget->draw returns size of widget
• event handling functions return 1 for when they (or one of their children) handled the event and 0 when they didn't