Start Download Callback
The callback that is invoked when the browser is about to start downloading a file.
The Params contain all information about the file which is about to be downloaded.
Use the download method to download this file into the particular directory.
Use the cancel method to suppress file download.
Since
7.8
Inheritors
Types
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An action providing a response to the StartDownloadCallback.
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interface Params
The parameters of the StartDownloadCallback.