Bug 302050: inline spellchecking for textboxes backend. r=bryner sr=bzbarsky

layout/forms/nsTextControlFrame.cpp

@@ -67,6 +67,7 @@
 #include "nsIScrollableFrame.h" //to turn off scroll bars
 #include "nsFormControlFrame.h" //for registering accesskeys
 #include "nsIDeviceContext.h" // to measure fonts
+#include "nsIInlineSpellChecker.h"
 
 #include "nsIContent.h"
 #include "nsIAtom.h"
@@ -132,6 +133,8 @@
 
 #define DEFAULT_COLUMN_WIDTH 20
 
+#define PREF_DEFAULT_SPELLCHECK "layout.textarea.spellcheckDefault"
+
 #include "nsContentCID.h"
 static NS_DEFINE_IID(kRangeCID,     NS_RANGE_CID);
 
@@ -1661,6 +1664,63 @@ nsTextControlFrame::CreateFrameFor(nsPresContext*   aPresContext,
   return NS_ERROR_FAILURE;
 }
 
+// nsTextControlFrame::SetEnableRealTimeSpell
+//
+//    This enables or disables the spellchecker based on the given flag. It
+//    will only create a spellcheck object if necessary.
+
+void
+nsTextControlFrame::SetEnableRealTimeSpell(PRBool aEnabled)
+{
+  nsresult rv = NS_OK;
+
+  NS_ASSERTION(!aEnabled || !IsPasswordTextControl(),
+               "don't enable real time spell for password controls");
+
+  // The editor will lazily create the spell checker object if it has not been
+  // created. We only want one created if we are turning it on, since not
+  // created implies there's no spell checking yet.
+  nsCOMPtr<nsIInlineSpellChecker> inlineSpellChecker;
+  rv = mEditor->GetInlineSpellChecker(aEnabled,
+                                      getter_AddRefs(inlineSpellChecker));
+
+  if (NS_SUCCEEDED(rv) && inlineSpellChecker) {
+    inlineSpellChecker->SetEnableRealTimeSpell(aEnabled);
+  }
+}
+
+// nsTextControlFrame::SyncRealTimeSpell
+//
+//    This function is called to update whether inline spell checking is enabled
+//    for the control. It is called on initialization and when things happen
+//    that might affect spellchecking (for example, if it gets enabled or
+//    disabled).
+//
+//    Multi-line text controls are spellchecked when the preference is set.
+//    Everything else (including read-only textareas) are not spellchecked by
+//    default.
+
+void
+nsTextControlFrame::SyncRealTimeSpell()
+{
+  PRBool readOnly = PR_FALSE;
+  if (mEditor) {
+    PRUint32 flags;
+    mEditor->GetFlags(&flags);
+    if (flags & nsIPlaintextEditor::eEditorReadonlyMask)
+      readOnly = PR_TRUE;
+  }
+
+  PRBool enable = PR_FALSE;
+  if (!readOnly && !IsSingleLineTextControl()) {
+    // multi-line text control: check the pref to see what the default should be
+    // GetBoolPref defaults the value to PR_FALSE is the pref is not set
+    enable = nsContentUtils::GetBoolPref(PREF_DEFAULT_SPELLCHECK);
+  }
+  SetEnableRealTimeSpell(enable);
+}
+
+
 nsresult
 nsTextControlFrame::InitEditor()
 {
@@ -1745,6 +1805,8 @@ nsTextControlFrame::InitEditor()
 
   transMgr->SetMaxTransactionCount(DEFAULT_UNDO_CAP);
 
+  SyncRealTimeSpell();
+
   if (IsPasswordTextControl()) {
     // Disable undo for password textfields.  Note that we want to do this at
     // the very end of InitEditor, so the calls to EnableUndo when setting the
@@ -2811,6 +2873,7 @@ nsTextControlFrame::AttributeChanged(PRInt32         aNameSpaceID,
         mSelCon->SetCaretEnabled(PR_TRUE);
     }    
     mEditor->SetFlags(flags);
+    SyncRealTimeSpell();
   }
   else if (mEditor && nsHTMLAtoms::disabled == aAttribute) 
   {