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windows
sequential_id_generator.h
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// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_SEQUENTIAL_ID_GENERATOR_H_
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#define FLUTTER_SHELL_PLATFORM_WINDOWS_SEQUENTIAL_ID_GENERATOR_H_
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#include <cstdint>
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#include <unordered_map>
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#include "flutter/fml/macros.h"
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namespace
flutter
{
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// This is used to generate a series of sequential ID numbers in a way that a
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// new ID is always the lowest possible ID in the sequence.
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//
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// based on
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// https://source.chromium.org/chromium/chromium/src/+/main:ui/gfx/sequential_id_generator.h
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class
SequentialIdGenerator
{
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public
:
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// Creates a new generator with the specified lower bound and uppoer bound for
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// the IDs.
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explicit
SequentialIdGenerator
(uint32_t min_id, uint32_t max_id);
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~SequentialIdGenerator
();
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// Generates a unique ID to represent |number|. The generated ID is the
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// smallest available ID greater than or equal to the |min_id| specified
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// during creation of the generator.
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uint32_t
GetGeneratedId
(uint32_t number);
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// Checks to see if the generator currently has a unique ID generated for
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// |number|.
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bool
HasGeneratedIdFor
(uint32_t number)
const
;
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// Removes the ID previously generated for |number| by calling
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// |GetGeneratedID()| - does nothing if the number is not mapped.
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void
ReleaseNumber
(uint32_t number);
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// Releases ID previously generated by calling |GetGeneratedID()|. Does
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// nothing if the ID is not mapped.
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void
ReleaseId
(uint32_t
id
);
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private
:
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typedef
std::unordered_map<uint32_t, uint32_t> IdMap;
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uint32_t GetNextAvailableId();
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void
UpdateNextAvailableIdAfterRelease(uint32_t
id
);
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IdMap number_to_id_;
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IdMap id_to_number_;
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const
uint32_t min_id_;
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const
uint32_t max_id_;
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uint32_t min_available_id_;
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FML_DISALLOW_COPY_AND_ASSIGN
(
SequentialIdGenerator
);
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};
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}
// namespace flutter
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#endif
// FLUTTER_SHELL_PLATFORM_WINDOWS_SEQUENTIAL_ID_GENERATOR_H_
flutter::SequentialIdGenerator
Definition
sequential_id_generator.h:20
flutter::SequentialIdGenerator::~SequentialIdGenerator
~SequentialIdGenerator()
Definition
sequential_id_generator.cc:30
flutter::SequentialIdGenerator::HasGeneratedIdFor
bool HasGeneratedIdFor(uint32_t number) const
Definition
sequential_id_generator.cc:43
flutter::SequentialIdGenerator::ReleaseId
void ReleaseId(uint32_t id)
Definition
sequential_id_generator.cc:54
flutter::SequentialIdGenerator::ReleaseNumber
void ReleaseNumber(uint32_t number)
Definition
sequential_id_generator.cc:47
flutter::SequentialIdGenerator::GetGeneratedId
uint32_t GetGeneratedId(uint32_t number)
Definition
sequential_id_generator.cc:32
FML_DISALLOW_COPY_AND_ASSIGN
#define FML_DISALLOW_COPY_AND_ASSIGN(TypeName)
Definition
macros.h:27
flutter
Definition
asset_manager.cc:10
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