Bug 1360154 - nsIPlaintextEditor might have to have hasText property for UpdateOverlayTextVisibility

* DocumentIsBody should return bool, not nsresult
* Add fast path to check whether valus is emtpy

Tag #1375

dom/html/nsTextEditorState.cpp

@@ -2214,6 +2214,23 @@ nsTextEditorState::SetValue(const nsAString& aValue, uint32_t aFlags)
   return true;
 }
 
+bool
+nsTextEditorState::HasNonEmptyValue()
+{
+  if (mEditor && mBoundFrame && mEditorInitialized &&
+      !mIsCommittingComposition) {
+    bool empty;
+    nsresult rv = mEditor->GetDocumentIsEmpty(&empty);
+    if (NS_SUCCEEDED(rv)) {
+      return !empty;
+    }
+  }
+
+  nsAutoString value;
+  GetValue(value, true);
+  return !value.IsEmpty();
+}
+
 void
 nsTextEditorState::InitializeKeyboardEventListeners()
 {

dom/html/nsTextEditorState.h

@@ -157,6 +157,11 @@ public:
   };
   MOZ_MUST_USE bool SetValue(const nsAString& aValue, uint32_t aFlags);
   void GetValue(nsAString& aValue, bool aIgnoreWrap) const;
+  bool HasNonEmptyValue();
+  // The following methods are for textarea element to use whether default
+  // value or not.
+  // XXX We might have to add assertion when it is into editable,
+  // or reconsider fixing bug 597525 to remove these.
   void EmptyValue() { if (mValue) mValue->Truncate(); }
   bool IsEmpty() const { return mValue ? mValue->IsEmpty() : true; }
 

editor/libeditor/HTMLEditor.cpp

@@ -3530,15 +3530,11 @@ HTMLEditor::SelectEntireDocument(Selection* aSelection)
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> rules(mRules);
 
-  // get editor root node
-  nsCOMPtr<nsIDOMElement> rootElement = do_QueryInterface(GetRoot());
-
   // is doc empty?
-  bool bDocIsEmpty;
-  nsresult rv = rules->DocumentIsEmpty(&bDocIsEmpty);
-  NS_ENSURE_SUCCESS(rv, rv);
+  if (rules->DocumentIsEmpty()) {
+    // get editor root node
+    Element* rootElement = GetRoot();
 
-  if (bDocIsEmpty) {
     // if its empty dont select entire doc - that would select the bogus node
     return aSelection->Collapse(rootElement, 0);
   }

editor/libeditor/TextEditRules.cpp

@@ -329,13 +329,10 @@ TextEditRules::DidDoAction(Selection* aSelection,
   }
 }
 
-NS_IMETHODIMP
-TextEditRules::DocumentIsEmpty(bool* aDocumentIsEmpty)
+NS_IMETHODIMP_(bool)
+TextEditRules::DocumentIsEmpty()
 {
-  NS_ENSURE_TRUE(aDocumentIsEmpty, NS_ERROR_NULL_POINTER);
-
-  *aDocumentIsEmpty = (mBogusNode != nullptr);
-  return NS_OK;
+  return (mBogusNode != nullptr);
 }
 
 void

editor/libeditor/TextEditRules.h

@@ -66,7 +66,7 @@ public:
                           bool* aCancel, bool* aHandled) override;
   NS_IMETHOD DidDoAction(Selection* aSelection, RulesInfo* aInfo,
                          nsresult aResult) override;
-  NS_IMETHOD DocumentIsEmpty(bool* aDocumentIsEmpty) override;
+  NS_IMETHOD_(bool) DocumentIsEmpty() override;
   NS_IMETHOD DocumentModified() override;
 
 protected:

editor/libeditor/TextEditor.cpp

@@ -913,7 +913,8 @@ TextEditor::GetDocumentIsEmpty(bool* aDocumentIsEmpty)
   // Protect the edit rules object from dying
   nsCOMPtr<nsIEditRules> rules(mRules);
 
-  return rules->DocumentIsEmpty(aDocumentIsEmpty);
+  *aDocumentIsEmpty = rules->DocumentIsEmpty();
+  return NS_OK;
 }
 
 NS_IMETHODIMP
@@ -1580,8 +1581,7 @@ TextEditor::SelectEntireDocument(Selection* aSelection)
   nsCOMPtr<nsIEditRules> rules(mRules);
 
   // is doc empty?
-  bool bDocIsEmpty;
-  if (NS_SUCCEEDED(rules->DocumentIsEmpty(&bDocIsEmpty)) && bDocIsEmpty) {
+  if (rules->DocumentIsEmpty()) {
     // get root node
     nsCOMPtr<nsIDOMElement> rootElement = do_QueryInterface(GetRoot());
     NS_ENSURE_TRUE(rootElement, NS_ERROR_FAILURE);

editor/libeditor/nsIEditRules.h

@@ -59,7 +59,7 @@ public:
                           bool* aHandled) = 0;
   NS_IMETHOD DidDoAction(mozilla::dom::Selection* aSelection,
                          mozilla::RulesInfo* aInfo, nsresult aResult) = 0;
-  NS_IMETHOD DocumentIsEmpty(bool* aDocumentIsEmpty) = 0;
+  NS_IMETHOD_(bool) DocumentIsEmpty() = 0;
   NS_IMETHOD DocumentModified() = 0;
 };