[AT-SPI] Add Bridge::{Enabled,Disabled}Signal()

These signals are emitted whenever the AT-SPI bridge is turned on or
off. Note that `EnabledSignal` is only emitted for the first `ForceUp`
call, i.e. the one that returns `ForceUpResult::JUST_STARTED` (and
a similar story for `DisabledSignal`).

These signals are necessarily static members of `Bridge`, to guarantee
that they are delivered to consumers even in those use cases in which
the object returned by `GetCurrentBridge()` changes during the lifetime
of the application.

Change-Id: Id266b7ed064b8b2690e093804c3f7d23ac4347ce

1 files changed, 5 insertions, 0 deletions

diff --git a/dali/internal/accessibility/bridge/bridge-impl.cpp b/dali/internal/accessibility/bridge/bridge-impl.cpp
index a4144ab21..181b44015 100644
--- a/dali/internal/accessibility/bridge/bridge-impl.cpp
+++ b/dali/internal/accessibility/bridge/bridge-impl.cpp
@@ -208,6 +208,8 @@ public:
       }
       mData->mCurrentlyHighlightedActor = {};
       mData->mHighlightActor            = {};
+
+      mDisabledSignal.Emit();
     }
     mHighlightedActor     = {};
     mHighlightClearAction = {};
@@ -289,6 +291,9 @@ public:
     {
       EmitActivate();
     }
+
+    mEnabledSignal.Emit();
+
     return ForceUpResult::JUST_STARTED;
   }