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// Copyright 2014 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_BASE_CURSOR_CURSOR_FACTORY_H_
#define UI_BASE_CURSOR_CURSOR_FACTORY_H_
#include <optional>
#include <string>
#include <vector>
#include "base/component_export.h"
#include "base/observer_list.h"
#include "build/build_config.h"
#include "ui/base/cursor/mojom/cursor_type.mojom-forward.h"
class SkBitmap;
template <class T>
class scoped_refptr;
namespace base {
class TimeDelta;
}
namespace gfx {
class Point;
}
namespace ui {
class PlatformCursor;
struct CursorData;
class COMPONENT_EXPORT(UI_BASE_CURSOR) CursorFactoryObserver {
public:
// Called by the factory after it has loaded the cursor theme.
virtual void OnThemeLoaded() = 0;
virtual ~CursorFactoryObserver();
};
class COMPONENT_EXPORT(UI_BASE_CURSOR) CursorFactory {
public:
CursorFactory();
virtual ~CursorFactory();
// Returns the thread-local instance.
static CursorFactory* GetInstance();
void AddObserver(CursorFactoryObserver* observer);
void RemoveObserver(CursorFactoryObserver* observer);
void NotifyObserversOnThemeLoaded();
// Return the default cursor of the specified type. When a default cursor is
// not available, nullptr is returned.
virtual scoped_refptr<PlatformCursor> GetDefaultCursor(
mojom::CursorType type);
// Return the default cursor of the specified type. When a default cursor is
// not available, nullptr is returned. This is implemented by backends that
// manages its own cursor images and therefore needs to know the appropriate
// scale to load them at.
virtual scoped_refptr<PlatformCursor> GetDefaultCursor(mojom::CursorType type,
float scale);
// Return the {bitmaps, hotspot} for the default cursor of the specified
// `type`. If that cursor is not available or the extraction of the data
// fails, return `std::nullopt`.
virtual std::optional<CursorData> GetCursorData(mojom::CursorType type);
// Return an image cursor for the specified `type` with a `bitmap` and
// `hotspot` and `scale`.
virtual scoped_refptr<PlatformCursor> CreateImageCursor(
mojom::CursorType type,
const SkBitmap& bitmap,
const gfx::Point& hotspot,
float scale);
// Return a animated cursor from the specified `bitmaps` and `hotspot`
// and `scale`. `frame_delay` is the delay between frames.
virtual scoped_refptr<PlatformCursor> CreateAnimatedCursor(
mojom::CursorType type,
const std::vector<SkBitmap>& bitmaps,
const gfx::Point& hotspot,
float scale,
base::TimeDelta frame_delay);
// Called after CursorThemeManager is initialized, to be able to track
// cursor theme and size changes.
virtual void ObserveThemeChanges();
private:
base::ObserverList<CursorFactoryObserver>::Unchecked observers_;
};
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
COMPONENT_EXPORT(UI_BASE_CURSOR)
std::vector<std::string> CursorNamesFromType(mojom::CursorType type);
#endif
} // namespace ui
#endif // UI_BASE_CURSOR_CURSOR_FACTORY_H_
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