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// Copyright (c) 2012 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.
#include "content/browser/renderer_host/tap_suppression_controller.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "content/browser/renderer_host/tap_suppression_controller_client.h"
namespace content {
TapSuppressionController::TapSuppressionController(
TapSuppressionControllerClient* client)
: client_(client),
state_(TapSuppressionController::NOTHING) {
}
TapSuppressionController::~TapSuppressionController() {}
void TapSuppressionController::GestureFlingCancel() {
switch (state_) {
case NOTHING:
case GFC_IN_PROGRESS:
case LAST_CANCEL_STOPPED_FLING:
state_ = GFC_IN_PROGRESS;
break;
case TAP_DOWN_STASHED:
break;
}
}
void TapSuppressionController::GestureFlingCancelAck(bool processed) {
base::TimeTicks event_time = Now();
switch (state_) {
case NOTHING:
break;
case GFC_IN_PROGRESS:
if (processed)
fling_cancel_time_ = event_time;
state_ = LAST_CANCEL_STOPPED_FLING;
break;
case TAP_DOWN_STASHED:
if (!processed) {
TRACE_EVENT0("browser",
"TapSuppressionController::GestureFlingCancelAck");
StopTapDownTimer();
client_->ForwardStashedTapDownForDeferral();
state_ = NOTHING;
} // Else waiting for the timer to release the stashed tap down.
break;
case LAST_CANCEL_STOPPED_FLING:
break;
}
}
bool TapSuppressionController::ShouldDeferTapDown() {
base::TimeTicks event_time = Now();
switch (state_) {
case NOTHING:
return false;
case GFC_IN_PROGRESS:
state_ = TAP_DOWN_STASHED;
StartTapDownTimer(
base::TimeDelta::FromMilliseconds(client_->MaxTapGapTimeInMs()));
return true;
case TAP_DOWN_STASHED:
NOTREACHED() << "TapDown on TAP_DOWN_STASHED state";
state_ = NOTHING;
return false;
case LAST_CANCEL_STOPPED_FLING:
if ((event_time - fling_cancel_time_).InMilliseconds()
< client_->MaxCancelToDownTimeInMs()) {
state_ = TAP_DOWN_STASHED;
StartTapDownTimer(
base::TimeDelta::FromMilliseconds(client_->MaxTapGapTimeInMs()));
return true;
} else {
state_ = NOTHING;
return false;
}
}
NOTREACHED() << "Invalid state";
return false;
}
bool TapSuppressionController::ShouldSuppressTapUp() {
switch (state_) {
case NOTHING:
case GFC_IN_PROGRESS:
return false;
case TAP_DOWN_STASHED:
state_ = NOTHING;
StopTapDownTimer();
client_->DropStashedTapDown();
return true;
case LAST_CANCEL_STOPPED_FLING:
NOTREACHED() << "Invalid TapUp on LAST_CANCEL_STOPPED_FLING state";
}
return false;
}
bool TapSuppressionController::ShouldSuppressTapCancel() {
switch (state_) {
case NOTHING:
case GFC_IN_PROGRESS:
return false;
case TAP_DOWN_STASHED:
state_ = NOTHING;
StopTapDownTimer();
client_->DropStashedTapDown();
return true;
case LAST_CANCEL_STOPPED_FLING:
NOTREACHED() << "Invalid TapCancel on LAST_CANCEL_STOPPED_FLING state";
}
return false;
}
base::TimeTicks TapSuppressionController::Now() {
return base::TimeTicks::Now();
}
void TapSuppressionController::StartTapDownTimer(const base::TimeDelta& delay) {
tap_down_timer_.Start(FROM_HERE, delay, this,
&TapSuppressionController::TapDownTimerExpired);
}
void TapSuppressionController::StopTapDownTimer() {
tap_down_timer_.Stop();
}
void TapSuppressionController::TapDownTimerExpired() {
switch (state_) {
case NOTHING:
case GFC_IN_PROGRESS:
case LAST_CANCEL_STOPPED_FLING:
NOTREACHED() << "Timer fired on invalid state.";
state_ = NOTHING;
break;
case TAP_DOWN_STASHED:
TRACE_EVENT0("browser",
"TapSuppressionController::TapDownTimerExpired");
client_->ForwardStashedTapDownSkipDeferral();
state_ = NOTHING;
break;
}
}
} // namespace content
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