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/*
* Copyright (C) 2016 The CyanogenMod 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.
*/
package org.cyanogenmod.hardware;
import org.cyanogenmod.internal.util.FileUtils;
import cyanogenmod.hardware.TouchscreenGesture;
/**
* Touchscreen gestures API
*
* A device may implement several touchscreen gestures for use while
* the display is turned off, such as drawing alphabets and shapes.
* These gestures can be interpreted by userspace to activate certain
* actions and launch certain apps, such as to skip music tracks,
* to turn on the flashlight, or to launch the camera app.
*
* This *should always* be supported by the hardware directly.
* A lot of recent touch controllers have a firmware option for this.
*
* This API provides support for enumerating the gestures
* supported by the touchscreen.
*/
public class TouchscreenGestures {
private static final String GESTURE_PATH =
"/sys/bus/i2c/devices/i2c-7/7-0038/ftsgesturemode";
// Id, name, keycode
private static final TouchscreenGesture[] TOUCHSCREEN_GESTURES = {
new TouchscreenGesture(0, "Letter C", 249),
new TouchscreenGesture(1, "Letter e", 250),
new TouchscreenGesture(2, "Letter S", 251),
new TouchscreenGesture(3, "Letter V", 252),
new TouchscreenGesture(4, "Letter W", 253),
new TouchscreenGesture(5, "Letter Z", 254),
};
private static final int KEY_MASK_GESTURE_CONTROL = 0x40;
public static final int[] ALL_GESTURE_MASKS = {
0x04, // c gesture mask
0x08, // e gesture mask
0x10, // s gesture mask
0x01, // v gesture mask
0x20, // w gesture mask
0x02, // z gesture mask
};
/**
* Whether device supports touchscreen gestures
*
* @return boolean Supported devices must return always true
*/
public static boolean isSupported() {
return FileUtils.isFileWritable(GESTURE_PATH) &&
FileUtils.isFileReadable(GESTURE_PATH);
}
/*
* Get the list of available gestures. A mode has an integer
* identifier and a string name.
*
* It is the responsibility of the upper layers to
* map the name to a human-readable format or perform translation.
*/
public static TouchscreenGesture[] getAvailableGestures() {
return TOUCHSCREEN_GESTURES;
}
/**
* This method allows to set the activation status of a gesture
*
* @param gesture The gesture to be activated
* state The new activation status of the gesture
* @return boolean Must be false if gesture is not supported
* or the operation failed; true in any other case.
*/
public static boolean setGestureEnabled(
final TouchscreenGesture gesture, final boolean state) {
int gestureMode = Integer.parseInt(FileUtils.readOneLine(GESTURE_PATH));
int mask = ALL_GESTURE_MASKS[gesture.id];
if (state)
gestureMode |= mask;
else
gestureMode &= ~mask;
if (gestureMode != 0)
gestureMode |= KEY_MASK_GESTURE_CONTROL;
return FileUtils.writeLine(GESTURE_PATH, String.format("%7s",
Integer.toBinaryString(gestureMode)).replace(' ', '0'));
}
}
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