Add SetCharacterDataCommand

third_party/WebKit/Source/core/editing/commands/SetCharacterDataCommand.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/editing/commands/SetCharacterDataCommand.h"
+
+#include "core/editing/EditingUtilities.h"
+#include "core/frame/Settings.h"
+#include "core/layout/LayoutText.h"
+
+namespace blink {
+
+SetCharacterDataCommand::SetCharacterDataCommand(Text* node,
+                                                 unsigned offset,
+                                                 unsigned count,
+                                                 const String& text)
+    : SimpleEditCommand(node->document()),
+      m_node(node),
+      m_offset(offset),
+      m_count(count),
+      m_newText(text) {
+  DCHECK(m_node);
+  DCHECK_LE(m_offset, m_node->length());
+  DCHECK_LE(m_offset + m_count, m_node->length());
+  // Callers shouldn't be trying to perform no-op replacements
+  DCHECK(!(count == 0 && text.length() == 0));
+}
+
+void SetCharacterDataCommand::doApply(EditingState*) {
+  // TODO(editing-dev): The use of updateStyleAndLayoutTree()
+  // needs to be audited.  See http://crbug.com/590369 for more details.
+  document().updateStyleAndLayoutTree();
+  if (!hasEditableStyle(*m_node))
+    return;
+
+  DummyExceptionStateForTesting exceptionState;
+  m_previousTextForUndo =
+      m_node->substringData(m_offset, m_count, exceptionState);
+  if (exceptionState.hadException())
+    return;
+
+  const bool passwordEchoEnabled =
+      document().settings() && document().settings()->getPasswordEchoEnabled();
+
+  if (passwordEchoEnabled) {
+    LayoutText* layoutText = m_node->layoutObject();
+    if (layoutText && layoutText->isSecure()) {
+      layoutText->momentarilyRevealLastTypedCharacter(m_offset +
+                                                      m_newText.length() - 1);
+    }
+  }
+
+  m_node->replaceData(m_offset, m_count, m_newText,
+                      IGNORE_EXCEPTION_FOR_TESTING);
+}
+
+void SetCharacterDataCommand::doUnapply() {
+  // TODO(editing-dev): The use of updateStyleAndLayoutTree()
+  // needs to be audited.  See http://crbug.com/590369 for more details.
+  document().updateStyleAndLayoutTree();
+  if (!hasEditableStyle(*m_node))
+    return;
+
+  m_node->replaceData(m_offset, m_newText.length(), m_previousTextForUndo,
+                      IGNORE_EXCEPTION_FOR_TESTING);
+}
+
+DEFINE_TRACE(SetCharacterDataCommand) {
+  visitor->trace(m_node);
+  SimpleEditCommand::trace(visitor);
+}
+
+}  // namespace blink