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// Copyright (c) 2009 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 APP_TREE_MODEL_H_
#define APP_TREE_MODEL_H_
#include <string>
#include <vector>
#include "base/logging.h"
class SkBitmap;
class TreeModel;
// TreeModelNode --------------------------------------------------------------
// Type of class returned from the model.
class TreeModelNode {
public:
// Returns the title for the node.
virtual std::wstring GetTitle() const = 0;
protected:
virtual ~TreeModelNode() {}
};
// Observer for the TreeModel. Notified of significant events to the model.
class TreeModelObserver {
public:
// Notification that nodes were added to the specified parent.
virtual void TreeNodesAdded(TreeModel* model,
TreeModelNode* parent,
int start,
int count) = 0;
// Notification that nodes were removed from the specified parent.
virtual void TreeNodesRemoved(TreeModel* model,
TreeModelNode* parent,
int start,
int count) = 0;
// Notification the children of |parent| have been reordered. Note, only
// the direct children of |parent| have been reordered, not descendants.
virtual void TreeNodeChildrenReordered(TreeModel* model,
TreeModelNode* parent) = 0;
// Notification that the contents of a node has changed.
virtual void TreeNodeChanged(TreeModel* model, TreeModelNode* node) = 0;
protected:
virtual ~TreeModelObserver() {}
};
// TreeModel ------------------------------------------------------------------
// The model for TreeView.
class TreeModel {
public:
// Returns the root of the tree. This may or may not be shown in the tree,
// see SetRootShown for details.
virtual TreeModelNode* GetRoot() = 0;
// Returns the number of children in the specified node.
virtual int GetChildCount(TreeModelNode* parent) = 0;
// Returns the child node at the specified index.
virtual TreeModelNode* GetChild(TreeModelNode* parent, int index) = 0;
// Returns the index of child node at the specified index.
virtual int IndexOfChild(TreeModelNode* parent, TreeModelNode* child) = 0;
// Returns the parent of a node, or NULL if node is the root.
virtual TreeModelNode* GetParent(TreeModelNode* node) = 0;
// Adds an observer of the model.
virtual void AddObserver(TreeModelObserver* observer) = 0;
// Removes an observer of the model.
virtual void RemoveObserver(TreeModelObserver* observer) = 0;
// Sets the title of the specified node.
// This is only invoked if the node is editable and the user edits a node.
virtual void SetTitle(TreeModelNode* node,
const std::wstring& title) {
NOTREACHED();
}
// Returns the set of icons for the nodes in the tree. You only need override
// this if you don't want to use the default folder icons.
virtual void GetIcons(std::vector<SkBitmap>* icons) {}
// Returns the index of the icon to use for |node|. Return -1 to use the
// default icon. The index is relative to the list of icons returned from
// GetIcons.
virtual int GetIconIndex(TreeModelNode* node) { return -1; }
protected:
virtual ~TreeModel() {}
};
#endif // APP_TREE_MODEL_H_
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