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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_TARGET_H_
#define CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_TARGET_H_
#include "base/functional/callback_forward.h"
#include "base/time/time.h"
#include "content/common/input/synthetic_gesture_params.h"
namespace blink {
class WebInputEvent;
}
namespace content {
// Interface between the synthetic gesture controller and the RenderWidgetHost.
class SyntheticGestureTarget {
public:
SyntheticGestureTarget() {}
virtual ~SyntheticGestureTarget() {}
// Allows synthetic gestures to insert input events in the highest level of
// input processing on the target platform (e.g. Java on Android), so that
// the event traverses the entire input processing stack.
virtual void DispatchInputEventToPlatform(
const blink::WebInputEvent& event) = 0;
// Returns the default gesture source type for the target.
virtual content::mojom::GestureSourceType
GetDefaultSyntheticGestureSourceType() const = 0;
// After how much time of inaction does the target assume that a pointer has
// stopped moving.
virtual base::TimeDelta PointerAssumedStoppedTime() const = 0;
// Returns the maximum number of DIPs a touch pointer can move without being
// considered moving by the platform.
virtual float GetTouchSlopInDips() const = 0;
// Returns the maximum change in span (distance between touch points) in DIPs
// before being considered a pinch-zoom gesture by the platform.
virtual float GetSpanSlopInDips() const = 0;
// Returns the minimum number of DIPs two touch pointers have to be apart
// to perform a pinch-zoom.
virtual float GetMinScalingSpanInDips() const = 0;
// If mouse wheels can only specify the number of ticks of some static
// multiplier constant, this method returns that constant (in DIPs). If mouse
// wheels can specify an arbitrary delta this returns 0.
virtual int GetMouseWheelMinimumGranularity() const = 0;
// This method will cause the system to flush and process all input before
// resolving the given callback. This is used to ensure that all effects of a
// gesture have been fully propagated through the system before performing
// further actions.
virtual void WaitForTargetAck(SyntheticGestureParams::GestureType type,
content::mojom::GestureSourceType source,
base::OnceClosure callback) const = 0;
virtual void GetVSyncParameters(base::TimeTicks& timebase,
base::TimeDelta& interval) const = 0;
};
} // namespace content
#endif // CONTENT_COMMON_INPUT_SYNTHETIC_GESTURE_TARGET_H_
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