1 files changed, 287 insertions, 0 deletions
diff --git a/editor/libeditor/ChangeStyleTransaction.cpp b/editor/libeditor/ChangeStyleTransaction.cpp
new file mode 100644
index 000000000..103d9c455
--- /dev/null
+++ b/editor/libeditor/ChangeStyleTransaction.cpp
@@ -0,0 +1,287 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ChangeStyleTransaction.h"
+
+#include "mozilla/dom/Element.h"        // for Element
+#include "nsAString.h"                  // for nsAString_internal::Append, etc.
+#include "nsCRT.h"                      // for nsCRT::IsAsciiSpace
+#include "nsDebug.h"                    // for NS_ENSURE_SUCCESS, etc.
+#include "nsError.h"                    // for NS_ERROR_NULL_POINTER, etc.
+#include "nsGkAtoms.h"                  // for nsGkAtoms, etc.
+#include "nsICSSDeclaration.h"          // for nsICSSDeclaration.
+#include "nsLiteralString.h"            // for NS_LITERAL_STRING, etc.
+#include "nsReadableUtils.h"            // for ToNewUnicode
+#include "nsString.h"                   // for nsAutoString, nsString, etc.
+#include "nsStyledElement.h"            // for nsStyledElement.
+#include "nsUnicharUtils.h"             // for nsCaseInsensitiveStringComparator
+
+namespace mozilla {
+
+using namespace dom;
+
+#define kNullCh (char16_t('\0'))
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ChangeStyleTransaction, EditTransactionBase,
+                                   mElement)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeStyleTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+NS_IMPL_ADDREF_INHERITED(ChangeStyleTransaction, EditTransactionBase)
+NS_IMPL_RELEASE_INHERITED(ChangeStyleTransaction, EditTransactionBase)
+
+ChangeStyleTransaction::~ChangeStyleTransaction()
+{
+}
+
+// Answers true if aValue is in the string list of white-space separated values
+// aValueList.
+bool
+ChangeStyleTransaction::ValueIncludes(const nsAString& aValueList,
+                                      const nsAString& aValue)
+{
+  nsAutoString valueList(aValueList);
+  bool result = false;
+
+  // put an extra null at the end
+  valueList.Append(kNullCh);
+
+  char16_t* value = ToNewUnicode(aValue);
+  char16_t* start = valueList.BeginWriting();
+  char16_t* end = start;
+
+  while (kNullCh != *start) {
+    while (kNullCh != *start && nsCRT::IsAsciiSpace(*start)) {
+      // skip leading space
+      start++;
+    }
+    end = start;
+
+    while (kNullCh != *end && !nsCRT::IsAsciiSpace(*end)) {
+      // look for space or end
+      end++;
+    }
+    // end string here
+    *end = kNullCh;
+
+    if (start < end) {
+      if (nsDependentString(value).Equals(nsDependentString(start),
+            nsCaseInsensitiveStringComparator())) {
+        result = true;
+        break;
+      }
+    }
+    start = ++end;
+  }
+  free(value);
+  return result;
+}
+
+// Removes the value aRemoveValue from the string list of white-space separated
+// values aValueList
+void
+ChangeStyleTransaction::RemoveValueFromListOfValues(
+                          nsAString& aValues,
+                          const nsAString& aRemoveValue)
+{
+  nsAutoString classStr(aValues);
+  nsAutoString outString;
+  // put an extra null at the end
+  classStr.Append(kNullCh);
+
+  char16_t* start = classStr.BeginWriting();
+  char16_t* end = start;
+
+  while (kNullCh != *start) {
+    while (kNullCh != *start && nsCRT::IsAsciiSpace(*start)) {
+      // skip leading space
+      start++;
+    }
+    end = start;
+
+    while (kNullCh != *end && !nsCRT::IsAsciiSpace(*end)) {
+      // look for space or end
+      end++;
+    }
+    // end string here
+    *end = kNullCh;
+
+    if (start < end && !aRemoveValue.Equals(start)) {
+      outString.Append(start);
+      outString.Append(char16_t(' '));
+    }
+
+    start = ++end;
+  }
+  aValues.Assign(outString);
+}
+
+ChangeStyleTransaction::ChangeStyleTransaction(Element& aElement,
+                                               nsIAtom& aProperty,
+                                               const nsAString& aValue,
+                                               EChangeType aChangeType)
+  : EditTransactionBase()
+  , mElement(&aElement)
+  , mProperty(&aProperty)
+  , mValue(aValue)
+  , mRemoveProperty(aChangeType == eRemove)
+  , mUndoValue()
+  , mRedoValue()
+  , mUndoAttributeWasSet(false)
+  , mRedoAttributeWasSet(false)
+{
+}
+
+NS_IMETHODIMP
+ChangeStyleTransaction::DoTransaction()
+{
+  nsCOMPtr<nsStyledElement> inlineStyles = do_QueryInterface(mElement);
+  NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
+
+  nsCOMPtr<nsICSSDeclaration> cssDecl = inlineStyles->Style();
+ 
+  nsAutoString propertyNameString;
+  mProperty->ToString(propertyNameString);
+
+  mUndoAttributeWasSet = mElement->HasAttr(kNameSpaceID_None,
+                                           nsGkAtoms::style);
+
+  nsAutoString values;
+  nsresult rv = cssDecl->GetPropertyValue(propertyNameString, values);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mUndoValue.Assign(values);
+
+  // Does this property accept more than one value? (bug 62682)
+  bool multiple = AcceptsMoreThanOneValue(*mProperty);
+
+  if (mRemoveProperty) {
+    nsAutoString returnString;
+    if (multiple) {
+      // Let's remove only the value we have to remove and not the others
+
+      // The two lines below are a workaround because
+      // nsDOMCSSDeclaration::GetPropertyCSSValue is not yet implemented (bug
+      // 62682)
+      RemoveValueFromListOfValues(values, NS_LITERAL_STRING("none"));
+      RemoveValueFromListOfValues(values, mValue);
+      if (values.IsEmpty()) {
+        rv = cssDecl->RemoveProperty(propertyNameString, returnString);
+        NS_ENSURE_SUCCESS(rv, rv);
+      } else {
+        nsAutoString priority;
+        cssDecl->GetPropertyPriority(propertyNameString, priority);
+        rv = cssDecl->SetProperty(propertyNameString, values, priority);
+        NS_ENSURE_SUCCESS(rv, rv);
+      }
+    } else {
+      rv = cssDecl->RemoveProperty(propertyNameString, returnString);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  } else {
+    nsAutoString priority;
+    cssDecl->GetPropertyPriority(propertyNameString, priority);
+    if (multiple) {
+      // Let's add the value we have to add to the others
+
+      // The line below is a workaround because
+      // nsDOMCSSDeclaration::GetPropertyCSSValue is not yet implemented (bug
+      // 62682)
+      AddValueToMultivalueProperty(values, mValue);
+    } else {
+      values.Assign(mValue);
+    }
+    rv = cssDecl->SetProperty(propertyNameString, values, priority);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Let's be sure we don't keep an empty style attribute
+  uint32_t length;
+  rv = cssDecl->GetLength(&length);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!length) {
+    rv = mElement->UnsetAttr(kNameSpaceID_None, nsGkAtoms::style, true);
+    NS_ENSURE_SUCCESS(rv, rv);
+  } else {
+    mRedoAttributeWasSet = true;
+  }
+
+  return cssDecl->GetPropertyValue(propertyNameString, mRedoValue);
+}
+
+nsresult
+ChangeStyleTransaction::SetStyle(bool aAttributeWasSet,
+                                 nsAString& aValue)
+{
+  if (aAttributeWasSet) {
+    // The style attribute was not empty, let's recreate the declaration
+    nsAutoString propertyNameString;
+    mProperty->ToString(propertyNameString);
+
+    nsCOMPtr<nsStyledElement> inlineStyles = do_QueryInterface(mElement);
+    NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
+    nsCOMPtr<nsICSSDeclaration> cssDecl = inlineStyles->Style();
+
+    if (aValue.IsEmpty()) {
+      // An empty value means we have to remove the property
+      nsAutoString returnString;
+      return cssDecl->RemoveProperty(propertyNameString, returnString);
+    }
+    // Let's recreate the declaration as it was
+    nsAutoString priority;
+    cssDecl->GetPropertyPriority(propertyNameString, priority);
+    return cssDecl->SetProperty(propertyNameString, aValue, priority);
+  }
+  return mElement->UnsetAttr(kNameSpaceID_None, nsGkAtoms::style, true);
+}
+
+NS_IMETHODIMP
+ChangeStyleTransaction::UndoTransaction()
+{
+  return SetStyle(mUndoAttributeWasSet, mUndoValue);
+}
+
+NS_IMETHODIMP
+ChangeStyleTransaction::RedoTransaction()
+{
+  return SetStyle(mRedoAttributeWasSet, mRedoValue);
+}
+
+NS_IMETHODIMP
+ChangeStyleTransaction::GetTxnDescription(nsAString& aString)
+{
+  aString.AssignLiteral("ChangeStyleTransaction: [mRemoveProperty == ");
+
+  if (mRemoveProperty) {
+    aString.AppendLiteral("true] ");
+  } else {
+    aString.AppendLiteral("false] ");
+  }
+  aString += nsDependentAtomString(mProperty);
+  return NS_OK;
+}
+
+// True if the CSS property accepts more than one value
+bool
+ChangeStyleTransaction::AcceptsMoreThanOneValue(nsIAtom& aCSSProperty)
+{
+  return &aCSSProperty == nsGkAtoms::text_decoration;
+}
+
+// Adds the value aNewValue to the list of white-space separated values aValues
+void
+ChangeStyleTransaction::AddValueToMultivalueProperty(nsAString& aValues,
+                                                     const nsAString& aNewValue)
+{
+  if (aValues.IsEmpty() || aValues.LowerCaseEqualsLiteral("none")) {
+    aValues.Assign(aNewValue);
+  } else if (!ValueIncludes(aValues, aNewValue)) {
+    // We already have another value but not this one; add it
+    aValues.Append(char16_t(' '));
+    aValues.Append(aNewValue);
+  }
+}
+
+} // namespace mozilla