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3081844cb4
Instead of a hand-rolled discriminated union (originally used to avoid a C++17 dependency, which is no longer an issue), implement EncodableValue as a std::variant. Rather than simply changing the internals, this makes EncodableValue a minimal std::variant subclass with only a handful of added methodS, replacing the old IsFoo/FooValue APIs with the standard std::holds_alternative/std::get, so that plugin code will use a standard-based API rather than a Flutter-specific API for wrapped values. This is a breaking change for Windows and GLFW plugins. In the short term USE_LEGACY_ENCODABLE_VALUE can be set in builds to use the old version, to separate rolling from updating. Fixes https://github.com/flutter/flutter/issues/61970
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
// 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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#include "flutter/shell/platform/windows/cursor_handler.h"
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#include <windows.h>
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#include "flutter/shell/platform/common/cpp/client_wrapper/include/flutter/standard_method_codec.h"
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static constexpr char kChannelName[] = "flutter/mousecursor";
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static constexpr char kActivateSystemCursorMethod[] = "activateSystemCursor";
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static constexpr char kKindKey[] = "kind";
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namespace flutter {
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CursorHandler::CursorHandler(BinaryMessenger* messenger,
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WindowBindingHandler* delegate)
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: channel_(std::make_unique<MethodChannel<EncodableValue>>(
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messenger,
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kChannelName,
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&StandardMethodCodec::GetInstance())),
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delegate_(delegate) {
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channel_->SetMethodCallHandler(
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[this](const MethodCall<EncodableValue>& call,
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std::unique_ptr<MethodResult<EncodableValue>> result) {
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HandleMethodCall(call, std::move(result));
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});
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}
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void CursorHandler::HandleMethodCall(
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const MethodCall<EncodableValue>& method_call,
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std::unique_ptr<MethodResult<EncodableValue>> result) {
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const std::string& method = method_call.method_name();
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if (method.compare(kActivateSystemCursorMethod) == 0) {
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const auto& arguments = std::get<EncodableMap>(*method_call.arguments());
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auto kind_iter = arguments.find(EncodableValue(std::string(kKindKey)));
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if (kind_iter == arguments.end()) {
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result->Error("Argument error",
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"Missing argument while trying to activate system cursor");
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}
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const auto& kind = std::get<std::string>(kind_iter->second);
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delegate_->UpdateFlutterCursor(kind);
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result->Success();
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} else {
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result->NotImplemented();
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}
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}
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} // namespace flutter
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