Adds Javascript API to customize the font picker

[radazzouz]

Solves #320

---

Details

Adds Javascript API to customize the font picker.

The exposed React Native props:

  /**
   * availableFontNames: Can be used to specfiy the available font names in the font picker.
   * Note: You need to set the desired font family names as `UIFontDescriptor`. See https://developer.apple.com/documentation/uikit/uifontdescriptor?language=objc
   * See `CustomFontPicker` in https://github.com/PSPDFKit/react-native/blob/master/samples/Catalog/Catalog.ios.js
   *
   * @platform ios
   */
  availableFontNames: PropTypes.array,
  /**
   * selectedFontName: Can be used to specfiy the current selected font in the font picker.
   * Note: You need to set the desired font family name as `UIFontDescriptor`. See https://developer.apple.com/documentation/uikit/uifontdescriptor?language=objc
   * See `CustomFontPicker` in https://github.com/PSPDFKit/react-native/blob/master/samples/Catalog/Catalog.ios.js
   *
   * @platform ios
   */
  selectedFontName: PropTypes.string,
  /**
   * showDownloadableFonts: Can be used to show or hide the downloadable fonts section in the font picker. Defaults to showing a the downloadable fonts (true).
   * See `CustomFontPicker` in https://github.com/PSPDFKit/react-native/blob/master/samples/Catalog/Catalog.ios.js
   *
   * @platform ios
   */
  showDownloadableFonts: PropTypes.bool,

Acceptance Criteria

• Add Javascript API to customize the font picker on Android.
• Add Javascript API to customize the font picker on iOS.
• When approved, right before merging, rebase with master and increment the package version in package.json, package-lock.json, samples/Catalog/package.json, and samples/NativeCatalog/package.json (see example commit: 1bf805f).
• Create a new release (and tag) with the new package version (see https://github.com/PSPDFKit/react-native/releases).

[steviki]

LGTM!

Just a question about the custom subclass override.

[steviki]

Could we always use the custom override, so we don't need to update the configuration all the time one of these properties is set, and just fallback to the default behavior, when none of these variables are set?

[radazzouz]

Good point! 👍 Addressed in cc92d1a

[simoarpe]

Android part looks good 👍