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Activation of a File Picker Provider
Demonstrations of the file picker provider contracts—for open and save—are found in the File picker
contracts sample, which I’ll refer to as the provider sample for clarity. Declarations for both are included
in the manifest with Supports Any File Type, so the sample will be listed with other apps in all file
pickers, as shown here:
When invoked, the Start page listed in the manifest for the appropriate contract (open or save) is
loaded. These are fileOpenPicker.html and fileSavePicker.html, found in the root of the project. Both of
these pages are again loaded independently of the main app and appear as shown in Figures 12-15 and
12-16. Note that the title of the app and the color scheme is determined by the Application UI settings
in the provider app’s manifest. In particularly, the text comes from the Display Name field and the colors
come from the Foreground Text and Background Color settings under Tile, as shown in Figure 12-17.
Note that the system automatically adds the down chevron (⌄) next to the title in Figures 12-15 and
12-16 through which the user can select a different picker location or provider app.
FIGURE 12-15 The Open UI as displayed by the sample.
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