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// Copyright (c) 2010 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.
// C++ bridge class to send a selector to a Cocoa object when the
// bookmark model changes. Some Cocoa objects edit the bookmark model
// and temporarily save a copy of the state (e.g. bookmark button
// editor). As a fail-safe, these objects want an easy cancel if the
// model changes out from under them. For example, if you have the
// bookmark button editor sheet open, then edit the bookmark in the
// bookmark manager, we'd want to simply cancel the editor.
//
// This class is conservative and may result in notifications which
// aren't strictly necessary. For example, node removal only needs to
// cancel an edit if the removed node is a folder (editors often have
// a list of "new parents"). But, just to be sure, notification
// happens on any removal.
#ifndef CHROME_BROWSER_COCOA_BOOKMARK_MODEL_OBSERVER_FOR_COCOA_H
#define CHROME_BROWSER_COCOA_BOOKMARK_MODEL_OBSERVER_FOR_COCOA_H
#import <Cocoa/Cocoa.h>
#include "base/basictypes.h"
#include "base/scoped_nsobject.h"
#include "chrome/browser/bookmarks/bookmark_model.h"
#include "chrome/browser/bookmarks/bookmark_model_observer.h"
class BookmarkModelObserverForCocoa : public BookmarkModelObserver {
public:
// When |node| in |model| changes, send |selector| to |object|.
// Assumes |selector| is a selector that takes one arg, like an
// IBOutlet. The arg passed is nil.
// Many notifications happen independently of node
// (e.g. BeingDeleted), so |node| can be nil.
//
// |object| is NOT retained, since the expected use case is for
// ||object| to own the BookmarkModelObserverForCocoa and we don't
// want a retain cycle.
BookmarkModelObserverForCocoa(const BookmarkNode* node,
BookmarkModel* model,
NSObject* object,
SEL selector) {
DCHECK(model);
node_ = node;
model_ = model;
object_ = object;
selector_ = selector;
model_->AddObserver(this);
}
virtual ~BookmarkModelObserverForCocoa() {
model_->RemoveObserver(this);
}
virtual void BookmarkModelBeingDeleted(BookmarkModel* model) {
Notify();
}
virtual void BookmarkNodeMoved(BookmarkModel* model,
const BookmarkNode* old_parent,
int old_index,
const BookmarkNode* new_parent,
int new_index) {
// Editors often have a tree of parents, so movement of folders
// must cause a cancel.
Notify();
}
virtual void BookmarkNodeRemoved(BookmarkModel* model,
const BookmarkNode* parent,
int old_index,
const BookmarkNode* node) {
// See comment in BookmarkNodeMoved.
Notify();
}
virtual void BookmarkNodeChanged(BookmarkModel* model,
const BookmarkNode* node) {
if ((node_ == node) || (!node_))
Notify();
}
virtual void BookmarkImportBeginning(BookmarkModel* model) {
// Be conservative.
Notify();
}
// Some notifications we don't care about, but by being pure virtual
// in the base class we must implement them.
virtual void Loaded(BookmarkModel* model) {
}
virtual void BookmarkNodeAdded(BookmarkModel* model,
const BookmarkNode* parent,
int index) {
}
virtual void BookmarkNodeFavIconLoaded(BookmarkModel* model,
const BookmarkNode* node) {
}
virtual void BookmarkNodeChildrenReordered(BookmarkModel* model,
const BookmarkNode* node) {
}
virtual void BookmarkImportEnding(BookmarkModel* model) {
}
private:
const BookmarkNode* node_; // Weak; owned by a BookmarkModel.
BookmarkModel* model_; // Weak; it is owned by a Profile.
NSObject* object_; // Weak, like a delegate.
SEL selector_;
void Notify() {
[object_ performSelector:selector_ withObject:nil];
}
DISALLOW_COPY_AND_ASSIGN(BookmarkModelObserverForCocoa);
};
#endif // CHROME_BROWSER_COCOA_BOOKMARK_MODEL_OBSERVER_FOR_COCOA_H
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