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// Copyright (c) 2012 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 UI_VIEWS_VIEW_MODEL_H_
#define UI_VIEWS_VIEW_MODEL_H_
#include <vector>
#include "base/basictypes.h"
#include "base/logging.h"
#include "ui/gfx/rect.h"
#include "ui/views/views_export.h"
namespace views {
class View;
// ViewModel is used to track an 'interesting' set of a views. Often times
// during animations views are removed after a delay, which makes for tricky
// coordinate conversion as you have to account for the possibility of the
// indices from the model not lining up with those you expect. This class lets
// you define the 'interesting' views and operate on those views.
class VIEWS_EXPORT ViewModel {
public:
ViewModel();
~ViewModel();
// Adds |view| to this model. This does not add |view| to a view hierarchy,
// only to this model.
void Add(View* view, int index);
// Removes the view at the specified index. This does not actually remove the
// view from the view hierarchy.
void Remove(int index);
// Moves the view at |index| to |target_index|. |target_index| is in terms
// of the model *after* the view at |index| is removed.
void Move(int index, int target_index);
// Variant of Move() that leaves the bounds as is. That is, after invoking
// this the bounds of the view at |target_index| (and all other indices) are
// exactly the same as the bounds of the view at |target_index| before
// invoking this.
void MoveViewOnly(int index, int target_index);
// Returns the number of views.
int view_size() const { return static_cast<int>(entries_.size()); }
// Removes and deletes all the views.
void Clear();
// Returns the view at the specified index.
View* view_at(int index) const {
check_index(index);
return entries_[index].view;
}
void set_ideal_bounds(int index, const gfx::Rect& bounds) {
check_index(index);
entries_[index].ideal_bounds = bounds;
}
const gfx::Rect& ideal_bounds(int index) const {
check_index(index);
return entries_[index].ideal_bounds;
}
// Returns the index of the specified view, or -1 if the view isn't in the
// model.
int GetIndexOfView(const View* view) const;
private:
struct Entry {
Entry() : view(NULL) {}
View* view;
gfx::Rect ideal_bounds;
};
typedef std::vector<Entry> Entries;
#if !defined(NDEBUG)
void check_index(int index) const {
DCHECK_LT(index, static_cast<int>(entries_.size()));
DCHECK_GE(index, 0);
}
#else
void check_index(int index) const {}
#endif
Entries entries_;
DISALLOW_COPY_AND_ASSIGN(ViewModel);
};
} // namespace views
#endif // UI_VIEWS_VIEW_MODEL_H_
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