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Unified Diff: content/browser/renderer_host/input/touch_timeout_handler.h

Issue 2709813002: Remove the touch ack timeout handler out of the legacy touch event queue. (Closed)
Patch Set: Fix nits Created 3 years, 10 months ago
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Index: content/browser/renderer_host/input/touch_timeout_handler.h
diff --git a/content/browser/renderer_host/input/touch_timeout_handler.h b/content/browser/renderer_host/input/touch_timeout_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..1556ff363b46c4a26ae3b0697633b1ec5f38906c
--- /dev/null
+++ b/content/browser/renderer_host/input/touch_timeout_handler.h
@@ -0,0 +1,81 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_TIMEOUT_HANDLER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_TIMEOUT_HANDLER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "content/browser/renderer_host/event_with_latency_info.h"
+#include "content/browser/renderer_host/input/timeout_monitor.h"
+#include "content/common/input/input_event_ack_state.h"
+
+namespace content {
+
+class TouchEventQueue;
+
+class TouchTimeoutHandler {
+ public:
+ TouchTimeoutHandler(TouchEventQueue* touch_queue,
+ base::TimeDelta desktop_timeout_delay,
+ base::TimeDelta mobile_timeout_delay);
+
+ ~TouchTimeoutHandler();
+
+ void StartIfNecessary(const TouchEventWithLatencyInfo& event);
+ bool ConfirmTouchEvent(uint32_t unique_touch_event_id,
+ InputEventAckState ack_result);
+ bool FilterEvent(const blink::WebTouchEvent& event);
+ void SetEnabled(bool enabled);
+ void SetUseMobileTimeout(bool use_mobile_timeout);
+ bool IsTimeoutTimerRunning() const { return timeout_monitor_.IsRunning(); }
+ bool IsEnabled() const { return enabled_ && !GetTimeoutDelay().is_zero(); }
+
+ private:
+ enum PendingAckState {
+ PENDING_ACK_NONE,
+ PENDING_ACK_ORIGINAL_EVENT,
+ PENDING_ACK_CANCEL_EVENT,
+ };
+
+ void OnTimeOut();
+ // Skip a cancel event if the timed-out event had no consumer and was the
+ // initial event in the gesture.
+ bool AckedTimeoutEventRequiresCancel(InputEventAckState ack_result) const;
+ void SetPendingAckState(PendingAckState new_pending_ack_state);
+ void LogSequenceStartForUMA();
+ void LogSequenceEndForUMAIfNecessary(bool timed_out);
+ base::TimeDelta GetTimeoutDelay() const;
+ bool HasTimeoutEvent() const;
+
+ TouchEventQueue* touch_queue_;
+
+ // How long to wait on a touch ack before cancelling the touch sequence.
+ const base::TimeDelta desktop_timeout_delay_;
+ const base::TimeDelta mobile_timeout_delay_;
+ bool use_mobile_timeout_;
+
+ // The touch event source for which we expect the next ack.
+ PendingAckState pending_ack_state_;
+
+ // The event for which the ack timeout is triggered.
+ TouchEventWithLatencyInfo timeout_event_;
+
+ // Provides timeout-based callback behavior.
+ TimeoutMonitor timeout_monitor_;
+
+ bool enabled_;
+ bool enabled_for_current_sequence_;
+
+ // Bookkeeping to classify and log whether a touch sequence times out.
+ bool sequence_awaiting_uma_update_;
+ bool sequence_using_mobile_timeout_;
+};
+
+} // namespace content
+
+#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_TIMEOUT_HANDLER_H_
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