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// Copyright (c) 2006-2008 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.
#ifndef StateTrackingString_h
#define StateTrackingString_h
#include "config.h"
#include "PlatformString.h"
#include "webkit/glue/webkit_glue.h"
namespace WebCore {
// This string class emulates the necessary calls that the form code makes
// and notifies the embedder if the value changes. We do not derive from
// String so that if we don't implement some function that a WebKit merge uses,
// the build will break instead of us silently missing that set.
class StateTrackingString {
public:
StateTrackingString(Node* parentNode) : m_parentNode(parentNode) {
Notify();
}
~StateTrackingString() {
// It would be nice to notify here, but when the string is going away,
// that means the input element is going away, and we can't get at its
// information.
}
void operator=(const StateTrackingString& other) {
// Don't copy m_parentNode. StateTrackingString should keep its
// parent node in its life time. The other's parent node may be
// deleted.
m_string = other.m_string;
}
void operator=(const char* other) {
m_string = other;
Notify();
}
void operator=(const String& other) {
m_string = other;
Notify();
}
// Things that don't need interception.
bool isNull() const {
return m_string.isNull();
}
unsigned length() const {
return m_string.length();
}
// It can be magically converted to a string reference when passed to other
// functions.
operator const String&() const { return m_string; }
private:
void Notify() const {
webkit_glue::NotifyFormStateChanged(m_parentNode->ownerDocument());
}
// The node that owns this value.
Node* m_parentNode;
// Actual data of this string.
String m_string;
};
} // namespace WebCore
#endif // StateTrackingString_h
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