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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_VIEWS_LAYOUT_PROPOSED_LAYOUT_H_
#define UI_VIEWS_LAYOUT_PROPOSED_LAYOUT_H_
#include <string>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/views/layout/layout_types.h"
#include "ui/views/views_export.h"
namespace views {
class View;
// Represents layout information for a child view within a host being laid
// out.
struct VIEWS_EXPORT ChildLayout {
// Note that comparison ignores available size; as two layouts with the same
// geometry are the same even if the available size is different.
bool operator==(const ChildLayout& other) const;
std::string ToString() const;
raw_ptr<View, DanglingUntriaged> child_view = nullptr;
bool visible = false;
gfx::Rect bounds;
SizeBounds available_size;
};
// Contains a full layout specification for the children of the host view.
struct VIEWS_EXPORT ProposedLayout {
ProposedLayout();
~ProposedLayout();
ProposedLayout(const ProposedLayout& other);
ProposedLayout(ProposedLayout&& other);
ProposedLayout(const gfx::Size& size,
const std::initializer_list<ChildLayout>& children);
ProposedLayout& operator=(const ProposedLayout& other);
ProposedLayout& operator=(ProposedLayout&& other);
bool operator==(const ProposedLayout& other) const = default;
// Convenience methods to get the child layout for the specified `view`;
// return the layout or null if not found.
ChildLayout* GetLayoutFor(const View* child_view);
const ChildLayout* GetLayoutFor(const View* child_view) const;
std::string ToString() const;
// The size of the host view given the size bounds for this layout. If both
// dimensions of the size bounds are specified, this will be the same size.
gfx::Size host_size;
// Contains an entry for each child view included in the layout.
std::vector<ChildLayout> child_layouts;
};
// Returns a layout that's linearly interpolated between |start| and |target|
// by |value|, which should be between 0 and 1. See
// gfx::Tween::LinearIntValueBetween() for the exact math involved.
VIEWS_EXPORT ProposedLayout ProposedLayoutBetween(double value,
const ProposedLayout& start,
const ProposedLayout& target);
} // namespace views
#endif // UI_VIEWS_LAYOUT_PROPOSED_LAYOUT_H_
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