Fiori里的busy dialog有兩種表現形式，一種是下圖里的flower形狀，由5個花瓣組成。另一種是下圖的3/4個圓環(huán)的效果。

關于前者的效果，可以看這個video。這個video是手動將default 300毫秒改成30秒之后的效果。

(1). When it appeas in UI
According to callstack, the Flower-like animation, technically speaking, the BusyDialog will be opened every time there is change on url, which you could observe in address bar in your browser. This animation is implemented via in /sap/bc/ui5_ui5/ui2/ushell/resources/sap/m/BusyDialog.js

(2). How is the Flower animation rendered
The entry point of rendering logic is in line 2019 below in file: /sap/bc/ui5_ui5/ui2/ushell/resources/sap/ui/core/Popup.js.

And here is the Flower rendering logic:

From here we know that the Flower we see in UI actually consists of FIVE ( why five? see line 97 below 😃 ) different div tag with well-prepared CSS class.

(3). When the Flower vanishes
There is a call in shell controller which will check whether the Flower busy dialog is still opened. If so, just put the close operation into the event queue with 0.3 second’s delay. It does not mean that the busy dialog will be closed after exactly 0.3 seconds due to Javascript’s single thread execution pattern.

Also in the end of UI navigation, the UI framework will also attempt to close busy dialog if any.

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