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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 ASH_ASSISTANT_UI_BASE_STACK_LAYOUT_H_
#define ASH_ASSISTANT_UI_BASE_STACK_LAYOUT_H_
#include <map>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "ui/views/layout/layout_manager_base.h"
#include "ui/views/layout/proposed_layout.h"
namespace ash {
// A layout manager which lays out its views atop each other. This differs from
// FillLayout in that we respect the preferred size of views during layout. It's
// possible to explicitly specify which dimension to respect. In contrast,
// FillLayout will cause its views to match the bounds of the host.
class COMPONENT_EXPORT(ASSISTANT_UI) StackLayout
: public views::LayoutManagerBase {
public:
enum class RespectDimension : uint32_t {
// Respect width. If enabled, child's preferred width will be used and will
// be horizontally center positioned. Otherwise, the child will be stretched
// to match parent width.
kWidth = 1,
// Respect height. If enabled, child's preferred height will be used.
// Otherwise, the child will be stretched to match parent height.
// Note that the child is always top-aligned.
kHeight = 1 << 1,
kAll = kWidth | kHeight,
};
enum class VerticalAlignment {
kCenter = 1,
};
StackLayout();
StackLayout(const StackLayout&) = delete;
StackLayout& operator=(const StackLayout&) = delete;
~StackLayout() override;
// views::LayoutManagerBase:
gfx::Size GetPreferredSize(const views::View* host) const override;
gfx::Size GetPreferredSize(
const views::View* host,
const views::SizeBounds& available_size) const override;
int GetPreferredHeightForWidth(const views::View* host,
int width) const override;
void SetRespectDimensionForView(views::View* view,
RespectDimension dimension);
void SetVerticalAlignmentForView(views::View* view,
VerticalAlignment alignment);
protected:
// views::LayoutManagerBase:
bool OnViewRemoved(views::View* host, views::View* view) override;
views::ProposedLayout CalculateProposedLayout(
const views::SizeBounds& size_bounds) const override;
private:
std::map<views::View*, RespectDimension> respect_dimension_map_;
std::map<views::View*, VerticalAlignment> vertical_alignment_map_;
};
} // namespace ash
#endif // ASH_ASSISTANT_UI_BASE_STACK_LAYOUT_H_
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