Bug 1660364 - Introduce IPDL getters for text range length, and absolute offsets. r=morgan,mccr8

We need a sync IPC call for this because otherwise the number of smaller sync messages we would need to call would be variable.

Differential Revision: https://phabricator.services.mozilla.com/D88076

accessible/ipc/extension/mac/DocAccessiblePlatformExtChild.cpp

@@ -131,6 +131,19 @@ mozilla::ipc::IPCResult DocAccessiblePlatformExtChild::RecvBoundsForRange(
   return IPC_OK();
 }
 
+mozilla::ipc::IPCResult DocAccessiblePlatformExtChild::RecvLengthForRange(
+    const uint64_t& aID, const int32_t& aStartOffset,
+    const uint64_t& aEndContainer, const int32_t& aEndOffset,
+    int32_t* aLength) {
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessiblePlatformExtChild::RecvOffsetAtIndex(
+    const uint64_t& aID, const int32_t& aIndex, uint64_t* aContainer,
+    int32_t* aOffset) {
+  return IPC_OK();
+}
+
 HyperTextAccessibleWrap*
 DocAccessiblePlatformExtChild::IdToHyperTextAccessibleWrap(
     const uint64_t& aID) const {

accessible/ipc/extension/mac/DocAccessiblePlatformExtChild.h

@@ -46,6 +46,17 @@ class DocAccessiblePlatformExtChild : public PDocAccessiblePlatformExtChild {
                                              const int32_t& aEndOffset,
                                              nsIntRect* aBounds);
 
+  mozilla::ipc::IPCResult RecvLengthForRange(const uint64_t& aID,
+                                             const int32_t& aStartOffset,
+                                             const uint64_t& aEndContainer,
+                                             const int32_t& aEndOffset,
+                                             int32_t* aLength);
+
+  mozilla::ipc::IPCResult RecvOffsetAtIndex(const uint64_t& aID,
+                                            const int32_t& aIndex,
+                                            uint64_t* aContainer,
+                                            int32_t* aOffset);
+
  private:
   HyperTextAccessibleWrap* IdToHyperTextAccessibleWrap(
       const uint64_t& aID) const;

accessible/ipc/extension/mac/PDocAccessiblePlatformExt.ipdl

@@ -36,6 +36,13 @@ child:
 
   nested(inside_sync) sync BoundsForRange(uint64_t aID, int32_t aStartOffset, uint64_t aEndContainer, int32_t aEndOffset)
       returns(nsIntRect aRetVal);
+
+  nested(inside_sync) sync LengthForRange(uint64_t aID, int32_t aStartOffset, uint64_t aEndContainer, int32_t aEndOffset)
+      returns(int32_t aLength);
+
+  nested(inside_sync) sync OffsetAtIndex(uint64_t aID, int32_t aIndex)
+      returns(uint64_t aContainer, int32_t aOffset);
+
 };
 
 }  // namespace a11y

ipc/ipdl/sync-messages.ini

@@ -632,6 +632,12 @@ platform = mac
 [PDocAccessiblePlatformExt::BoundsForRange]
 description = Retrieve geometric bounds for text range. Platform API is synchronous, so this needs to be too.
 platform = mac
+[PDocAccessiblePlatformExt::LengthForRange]
+description = Retrieve length of text range. Platform API is synchronous, so this needs to be too.
+platform = mac
+[PDocAccessiblePlatformExt::OffsetAtIndex]
+description = Retrieve text offset at absolute index. Platform API is synchronous, so this needs to be too.
+platform = mac
 
 # Plugins
 [PPluginWidget::Create]