Abstract: Animations are displayed on a user interface (UI) of a computing device using one of multiple different animation system modes, each animation system mode operating in a different manner to determine how to change the display for an animation. The animation can be on a particular object that is displayed by the computing device (e.g., scrolling a list, moving an icon or character from one location to another) and/or can be on the display as a whole (e.g., panning or scrolling a view of the whole display). The multi-mode animation system operates to select an animation system mode on a frame by frame basis. For each frame of content being displayed on the display device, the multi-mode animation system selects an appropriate one of the animation system modes to use for generating the content of that frame.

Abstract: User input that is part of a user interaction with a computing device is received by a system module. The system module notifies the application of the user input, and the application determines whether the application is to handle the user interaction or the whether the operating system is to handle the user interaction. For user interactions that the operating system is to handle, the application notifies the operating system to handle the user interaction. For the duration of the user interaction, the operating system then determines what changes to make to a display of data based on the user interaction and need not (and typically does not) notify the application of the user input. Thus, the application hands off the user interaction to the operating system.

Abstract: Animations are displayed on a user interface (UI) of a computing device using one of multiple different animation system modes, each animation system mode operating in a different manner to determine how to change the display for an animation. The animation can be on a particular object that is displayed by the computing device (e.g., scrolling a list, moving an icon or character from one location to another) and/or can be on the display as a whole (e.g., panning or scrolling a view of the whole display). The multi-mode animation system operates to select an animation system mode on a frame by frame basis. For each frame of content being displayed on the display device, the multi-mode animation system selects an appropriate one of the animation system modes to use for generating the content of that frame.