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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef StateTrackingString_h
#define StateTrackingString_h
#include "config.h"
#include "String.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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