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authorwolfbeast <mcwerewolf@gmail.com>2018-05-12 11:09:44 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-05-12 11:09:44 +0200
commitcfe5ef4ac7cd59f094b538252161ad74223c47da (patch)
treee5c0ee7e70db84bd2bfc6062784006769e9df730 /widget/gonk/libui/VelocityControl.h
parent28cf922aa9af4d4b8e0a3ce91dc1270a55986909 (diff)
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Remove Gonk build directories
Diffstat (limited to 'widget/gonk/libui/VelocityControl.h')
-rw-r--r--widget/gonk/libui/VelocityControl.h107
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diff --git a/widget/gonk/libui/VelocityControl.h b/widget/gonk/libui/VelocityControl.h
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-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef _ANDROIDFW_VELOCITY_CONTROL_H
-#define _ANDROIDFW_VELOCITY_CONTROL_H
-
-#include "Input.h"
-#include "VelocityTracker.h"
-#include <utils/Timers.h>
-
-namespace android {
-
-/*
- * Specifies parameters that govern pointer or wheel acceleration.
- */
-struct VelocityControlParameters {
- // A scale factor that is multiplied with the raw velocity deltas
- // prior to applying any other velocity control factors. The scale
- // factor should be used to adapt the input device resolution
- // (eg. counts per inch) to the output device resolution (eg. pixels per inch).
- //
- // Must be a positive value.
- // Default is 1.0 (no scaling).
- float scale;
-
- // The scaled speed at which acceleration begins to be applied.
- // This value establishes the upper bound of a low speed regime for
- // small precise motions that are performed without any acceleration.
- //
- // Must be a non-negative value.
- // Default is 0.0 (no low threshold).
- float lowThreshold;
-
- // The scaled speed at which maximum acceleration is applied.
- // The difference between highThreshold and lowThreshold controls
- // the range of speeds over which the acceleration factor is interpolated.
- // The wider the range, the smoother the acceleration.
- //
- // Must be a non-negative value greater than or equal to lowThreshold.
- // Default is 0.0 (no high threshold).
- float highThreshold;
-
- // The acceleration factor.
- // When the speed is above the low speed threshold, the velocity will scaled
- // by an interpolated value between 1.0 and this amount.
- //
- // Must be a positive greater than or equal to 1.0.
- // Default is 1.0 (no acceleration).
- float acceleration;
-
- VelocityControlParameters() :
- scale(1.0f), lowThreshold(0.0f), highThreshold(0.0f), acceleration(1.0f) {
- }
-
- VelocityControlParameters(float scale, float lowThreshold,
- float highThreshold, float acceleration) :
- scale(scale), lowThreshold(lowThreshold),
- highThreshold(highThreshold), acceleration(acceleration) {
- }
-};
-
-/*
- * Implements mouse pointer and wheel speed control and acceleration.
- */
-class VelocityControl {
-public:
- VelocityControl();
-
- /* Sets the various parameters. */
- void setParameters(const VelocityControlParameters& parameters);
-
- /* Resets the current movement counters to zero.
- * This has the effect of nullifying any acceleration. */
- void reset();
-
- /* Translates a raw movement delta into an appropriately
- * scaled / accelerated delta based on the current velocity. */
- void move(nsecs_t eventTime, float* deltaX, float* deltaY);
-
-private:
- // If no movements are received within this amount of time,
- // we assume the movement has stopped and reset the movement counters.
- static const nsecs_t STOP_TIME = 500 * 1000000; // 500 ms
-
- VelocityControlParameters mParameters;
-
- nsecs_t mLastMovementTime;
- VelocityTracker::Position mRawPosition;
- VelocityTracker mVelocityTracker;
-};
-
-} // namespace android
-
-#endif // _ANDROIDFW_VELOCITY_CONTROL_H