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Diffstat (limited to 'widget/gonk/libui/VelocityControl.h')
-rw-r--r-- | widget/gonk/libui/VelocityControl.h | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/widget/gonk/libui/VelocityControl.h b/widget/gonk/libui/VelocityControl.h deleted file mode 100644 index 8a2c695d6..000000000 --- a/widget/gonk/libui/VelocityControl.h +++ /dev/null @@ -1,107 +0,0 @@ -/* - * 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 |