Bug 1306549 part.4 Create KeyboardLayout::GetNativeUniCharsAndModifiers() for wrapping VirtualKey::GetNativeUniChars() r=m_kato

Similar to VirtualKey::GetUniChars(), VirtualKey::GetNativeUniChars() needs key index.  So, it should be wrapped by a new helper method, KeyboardLayout::GetNativeUniCharsAndModifiers(), and KeyboardEvent::InitNativeKey() should use this instead of accessing its member's GetNativeUniChars().

MozReview-Commit-ID: 7M9OlNF698Y

--HG--
extra : rebase_source : e19a5c99014a8f0a0ed7cc3a86fe0c4ee10cebb5

widget/windows/KeyboardLayout.cpp

@@ -3639,11 +3639,13 @@ KeyboardLayout::InitNativeKey(NativeKey& aNativeKey,
   }
 
   uint8_t virtualKey = aNativeKey.mOriginalVirtualKeyCode;
-  int32_t virtualKeyIndex = GetKeyIndex(virtualKey);
 
-  if (virtualKeyIndex < 0) {
-    // Does not produce any printable characters, but still preserves the
-    // dead-key state.
+  // If the key is not a usual printable key, KeyboardLayout class assume that
+  // it's not cause dead char nor printable char.  Therefore, there are nothing
+  // to do here fore such keys (e.g., function keys).
+  // However, this should keep dead key state even if non-printable key is
+  // pressed during a dead key sequence.
+  if (!IsPrintableCharKey(virtualKey)) {
     return;
   }
 
@@ -3665,7 +3667,7 @@ KeyboardLayout::InitNativeKey(NativeKey& aNativeKey,
           VirtualKey::ModifierKeyStateToShiftState(aModKeyState);
       }
       UniCharsAndModifiers deadChars =
-        mVirtualKeys[virtualKeyIndex].GetNativeUniChars(aModKeyState);
+        GetNativeUniCharsAndModifiers(virtualKey, aModKeyState);
       NS_ASSERTION(deadChars.mLength == 1,
                    "dead key must generate only one character");
       aNativeKey.mKeyNameIndex = KEY_NAME_INDEX_Dead;
@@ -3800,6 +3802,20 @@ KeyboardLayout::GetUniCharsAndModifiers(
   return mVirtualKeys[key].GetUniChars(aShiftState);
 }
 
+UniCharsAndModifiers
+KeyboardLayout::GetNativeUniCharsAndModifiers(
+                  uint8_t aVirtualKey,
+                  const ModifierKeyState& aModKeyState) const
+{
+  int32_t key = GetKeyIndex(aVirtualKey);
+  if (key < 0) {
+    return UniCharsAndModifiers();
+  }
+  VirtualKey::ShiftState shiftState =
+    VirtualKey::ModifierKeyStateToShiftState(aModKeyState);
+  return mVirtualKeys[key].GetNativeUniChars(shiftState);
+}
+
 void
 KeyboardLayout::LoadLayout(HKL aLayout)
 {

widget/windows/KeyboardLayout.h

@@ -699,7 +699,7 @@ public:
          const ModifierKeyState& aModKeyState);
 
   /**
-   * GetUniCharsAndModifiers() returns characters which is inputted by the
+   * GetUniCharsAndModifiers() returns characters which are inputted by
    * aVirtualKey with aModKeyState.  This method isn't stateful.
    * Note that if the combination causes text input, the result's Ctrl and
    * Alt key state are never active.
@@ -713,6 +713,16 @@ public:
     return GetUniCharsAndModifiers(aVirtualKey, shiftState);
   }
 
+  /**
+   * GetNativeUniCharsAndModifiers() returns characters which are inputted by
+   * aVirtualKey with aModKeyState.  The method isn't stateful.
+   * Note that different from GetUniCharsAndModifiers(), this returns
+   * actual modifier state of Ctrl and Alt.
+   */
+  UniCharsAndModifiers GetNativeUniCharsAndModifiers(
+                         uint8_t aVirtualKey,
+                         const ModifierKeyState& aModKeyState) const;
+
   /**
    * OnLayoutChange() must be called before the first keydown message is
    * received.  LoadLayout() changes the keyboard state, that causes breaking