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→Interactions with other components
* On B2G: [https://mxr.mozilla.org/mozilla-central/source/layout/ipc/RenderFrameParent.h RenderFrameParent]/[https://mxr.mozilla.org/mozilla-central/source/layout/ipc/RenderFrameChild.h RenderFrameChild] and [https://mxr.mozilla.org/mozilla-central/source/dom/ipc/TabParent.h TabParent]/[https://mxr.mozilla.org/mozilla-central/source/dom/ipc/TabChild.h TabChild]
* On Metro: [https://mxr.mozilla.org/mozilla-central/source/widget/windows/winrt/MetroWidget.h MetroWidget] and [https://mxr.mozilla.org/mozilla-central/source/widget/windows/winrt/MetroInput.h MetroInput]
* On Fennec (which doesn't use the APZ yet): [https://mxr.mozilla.org/mozilla-central/source/mobile/android/base/GeckoAppShell.java GeckoAppShell] and [https://mxr.mozilla.org/mozilla-central/source/mobile/android/base/gfx/GeckoLayerClient.java GeckoLayerClient], which communicate with native code via the [httpshttp://mxr.mozilla.org/mozilla-central/source/widget/android/nsIAndroidBridgeAndroidJNI.idl AndroidBridgecpp AndroidJNI].
The widget code interacts with the APZ in the following ways:
* forwards relevant input events to the APZ (APZCTreeManager::ReceiveInputEvent())
* notifies the APZ about Gecko events that are relevant to it, such as** a reflow that causes a change in the dimensions of a scrollable layer (APZCTreeManager::UpdateCompositionBounds())** a scrollTo performed by content (APZCTreeManager::UpdateScrollOffset())**
=== Gecko ===
