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b569e8c2fd
Fixes https://github.com/flutter/flutter/issues/31086 This patch is a lower level implementation of https://github.com/flutter/flutter/pull/36616 that would only impact iOS engine, and host unittests.
76 lines
2.9 KiB
C++
76 lines
2.9 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/common/pointer_data_dispatcher.h"
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namespace flutter {
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PointerDataDispatcher::~PointerDataDispatcher() = default;
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DefaultPointerDataDispatcher::~DefaultPointerDataDispatcher() = default;
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SmoothPointerDataDispatcher::~SmoothPointerDataDispatcher() = default;
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void DefaultPointerDataDispatcher::DispatchPacket(
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std::unique_ptr<PointerDataPacket> packet,
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uint64_t trace_flow_id) {
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animator_.EnqueueTraceFlowId(trace_flow_id);
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runtime_controller_.DispatchPointerDataPacket(*packet);
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}
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// Intentional no-op.
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void DefaultPointerDataDispatcher::OnFrameLayerTreeReceived() {}
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void SmoothPointerDataDispatcher::DispatchPacket(
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std::unique_ptr<PointerDataPacket> packet,
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uint64_t trace_flow_id) {
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if (is_pointer_data_in_progress_) {
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if (pending_packet_ != nullptr) {
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DispatchPendingPacket();
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}
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pending_packet_ = std::move(packet);
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pending_trace_flow_id_ = trace_flow_id;
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} else {
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FML_DCHECK(pending_packet_ == nullptr);
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DefaultPointerDataDispatcher::DispatchPacket(std::move(packet),
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trace_flow_id);
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}
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is_pointer_data_in_progress_ = true;
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}
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void SmoothPointerDataDispatcher::OnFrameLayerTreeReceived() {
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if (is_pointer_data_in_progress_) {
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if (pending_packet_ != nullptr) {
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// This is already in the UI thread. However, method
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// `OnFrameLayerTreeReceived` is called by `Engine::Render` (a part of the
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// `VSYNC` UI thread task) which is in Flutter framework's
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// `SchedulerPhase.persistentCallbacks` phase. In that phase, no pointer
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// data packet is allowed to be fired because the framework requires such
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// phase to be executed synchronously without being interrupted. Hence
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// we'll post a new UI thread task to fire the packet after `VSYNC` task
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// is done. When a non-VSYNC UI thread task (like the following one) is
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// run, the Flutter framework is always in `SchedulerPhase.idle` phase).
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task_runners_.GetUITaskRunner()->PostTask(
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// Use and validate a `fml::WeakPtr` because this dispatcher might
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// have been destructed with engine when the task is run.
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[dispatcher = weak_factory_.GetWeakPtr()]() {
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if (dispatcher) {
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dispatcher->DispatchPendingPacket();
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}
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});
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} else {
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is_pointer_data_in_progress_ = false;
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}
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}
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}
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void SmoothPointerDataDispatcher::DispatchPendingPacket() {
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FML_DCHECK(pending_packet_ != nullptr);
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FML_DCHECK(is_pointer_data_in_progress_);
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DefaultPointerDataDispatcher::DispatchPacket(std::move(pending_packet_),
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pending_trace_flow_id_);
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pending_packet_ = nullptr;
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pending_trace_flow_id_ = -1;
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}
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} // namespace flutter
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