potter: add cmhw TouchscreenGestures feature

Change-Id: I32911e3dffcdaa6ad997a75a91e8ac10e2d7b7ea

cmhw/org/cyanogenmod/hardware/TouchscreenGestures.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod Project
+ *           (C) 2017 The LineageOS 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_PATHS = {
+        "/proc/touchpanel/up_swipe_enable",
+        "/proc/touchpanel/down_swipe_enable",
+        "/proc/touchpanel/left_swipe_enable",
+        "/proc/touchpanel/right_swipe_enable",
+    };
+
+    // Id, name, keycode
+    private static final TouchscreenGesture[] TOUCHSCREEN_GESTURES = {
+        new TouchscreenGesture(0, "One finger up swipe", 66),
+        new TouchscreenGesture(1, "One finger down swipe", 65),
+        new TouchscreenGesture(2, "One finger left swipe", 64),
+        new TouchscreenGesture(3, "One finger right swipe", 63),
+    };
+
+    /**
+     * Whether device supports touchscreen gestures
+     *
+     * @return boolean Supported devices must return always true
+     */
+    public static boolean isSupported() {
+        return true;
+    }
+
+    /*
+     * 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) {
+        return true;
+    }
+}
+