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devsite/source/_changelogs/4.0.md

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+---
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+title: Pebble SDK 4.0 - Changelog
+date: 2016-08-30
+---
+
+### Changes to Firmware
+
+* Added support for [Pebble 2]({{ site.links.kickstarter3 }}).
+* Added [AppGlances](/guides/user-interfaces/appglance-c/) and [Timeline Quick View](/guides/user-interfaces/unobstructed-area/).
+* Removed Timeline Past.
+
+### Changes to SDK
+
+* Added the new "Diorite" platform for the Pebble 2.
+* Added support for writing watchfaces in JavaScript running directly on the watch using
+  [Rocky.js](/blog/2016/08/15/introducing-rockyjs-watchfaces/).
+* Added `PBL_COMPASS`, `PBL_SMARTSTRAP_POWER`, and `PBL_PLATFORM_DIORITE`
+  defines.
+* Added ``preferred_result_display_duration`` to get the recommended number of
+  milliseconds a result window should be visible before it should be closed.
+* Added ``AppExitReason`` and ``exit_reason_set``
+for an application to be able to notify the system of
+[the reason it is exiting](/guides/user-interfaces/app-exit-reason/).
+* Added ``AppGlanceSlice``, ``AppGlanceResult``, ``AppGlanceReloadSession``,
+``app_glance_add_slice``, ``AppGlanceReloadCallback`` and ``app_glance_reload``.
+to support [AppGlances](/guides/user-interfaces/appglance-c/).
+* Added [Unobstructed Area APIs](/guides/user-interfaces/unobstructed-area/):
+``UnobstructedAreaWillChangeHandler``,
+``UnobstructedAreaChangeHandler``,
+``UnobstructedAreaDidChangeHandler``,
+``UnobstructedAreaHandlers``,
+``layer_get_unobstructed_bounds``,
+``unobstructed_area_service_subscribe``
+and ``unobstructed_area_service_unsubscribe``
+to enable a watchface to adapt to overlays partially obstructing it, such as
+during a Timeline Quick View.
+* The compass service will now return ``CompassStatusUnavailable`` on diorite
+  watches, which do not have a compass. Apps built with SDK 2 or SDK 3 will
+  still see ``CompassStatusDataInvalid``.
+* Report memory usage for Pebble Packages at build time.
+* Fixed bug causing zero-length JS files to result in build failures.
+
+### Changes to Documentation
+
+* Added [AppGlances Guide](/guides/user-interfaces/appglance-c/)
+* Added [Unobstructed Area Guide](/guides/user-interfaces/unobstructed-area/)
+* Added [AppExitReason Guide](/guides/user-interfaces/app-exit-reason)
+* Added [One Click Action Guide](/guides/design-and-interaction/one-click-actions/)
+* Added API documentation for new ``App Glance``, ``UnobstructedArea`` and ``AppExitReason`` APIs.
+
+### Known Issues
+
+* `pebble gdb` is currently broken.
+* AppGlances cannot currently use system icons.
+* Custom AppGlance icons may not work if the assigned published media ID does not happen
+  to also be a standard resource ID. This can usually be worked around by assigning published
+  media IDs starting at 1 and counting up.
+* For apps not using AppGlances, the system default icon may appear instead of the app-specified
+  menu icon if the resources defined for the app vary between platforms. This can be worked
+  around by defining the menu icon resource before defining any resources that use the
+  `targetPlatforms` attribute.