| /* |
| * Copyright (C) 2019 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. |
| */ |
| |
| package android.widget; |
| |
| import static android.widget.Editor.logCursor; |
| |
| import static com.android.internal.annotations.VisibleForTesting.Visibility.PACKAGE; |
| |
| import android.annotation.IntDef; |
| import android.view.InputDevice; |
| import android.view.MotionEvent; |
| import android.view.ViewConfiguration; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| |
| /** |
| * Helper class used by {@link Editor} to track state for touch events. Ideally the logic here |
| * should be replaced with {@link android.view.GestureDetector}. |
| * |
| * @hide |
| */ |
| @VisibleForTesting(visibility = PACKAGE) |
| public class EditorTouchState { |
| private float mLastDownX, mLastDownY; |
| private long mLastDownMillis; |
| private float mLastUpX, mLastUpY; |
| private long mLastUpMillis; |
| |
| @IntDef({MultiTapStatus.NONE, MultiTapStatus.FIRST_TAP, MultiTapStatus.DOUBLE_TAP, |
| MultiTapStatus.TRIPLE_CLICK}) |
| @Retention(RetentionPolicy.SOURCE) |
| @VisibleForTesting |
| public @interface MultiTapStatus { |
| int NONE = 0; |
| int FIRST_TAP = 1; |
| int DOUBLE_TAP = 2; |
| int TRIPLE_CLICK = 3; // Only for mouse input. |
| } |
| @MultiTapStatus |
| private int mMultiTapStatus = MultiTapStatus.NONE; |
| private boolean mMultiTapInSameArea; |
| |
| private boolean mMovedEnoughForDrag; |
| private boolean mIsDragCloseToVertical; |
| |
| public float getLastDownX() { |
| return mLastDownX; |
| } |
| |
| public float getLastDownY() { |
| return mLastDownY; |
| } |
| |
| public float getLastUpX() { |
| return mLastUpX; |
| } |
| |
| public float getLastUpY() { |
| return mLastUpY; |
| } |
| |
| public boolean isDoubleTap() { |
| return mMultiTapStatus == MultiTapStatus.DOUBLE_TAP; |
| } |
| |
| public boolean isTripleClick() { |
| return mMultiTapStatus == MultiTapStatus.TRIPLE_CLICK; |
| } |
| |
| public boolean isMultiTap() { |
| return mMultiTapStatus == MultiTapStatus.DOUBLE_TAP |
| || mMultiTapStatus == MultiTapStatus.TRIPLE_CLICK; |
| } |
| |
| public boolean isMultiTapInSameArea() { |
| return isMultiTap() && mMultiTapInSameArea; |
| } |
| |
| public boolean isMovedEnoughForDrag() { |
| return mMovedEnoughForDrag; |
| } |
| |
| public boolean isDragCloseToVertical() { |
| return mIsDragCloseToVertical; |
| } |
| |
| /** |
| * Updates the state based on the new event. |
| */ |
| public void update(MotionEvent event, ViewConfiguration config) { |
| final int action = event.getActionMasked(); |
| if (action == MotionEvent.ACTION_DOWN) { |
| final boolean isMouse = event.isFromSource(InputDevice.SOURCE_MOUSE); |
| |
| // We check both the time between the last up and current down event, as well as the |
| // time between the first down and up events. The latter check is necessary to handle |
| // the case when the user taps, drags/holds for some time, and then lifts up and |
| // quickly taps in the same area. This scenario should not be treated as a double-tap. |
| // This follows the behavior in GestureDetector. |
| final long millisSinceLastUp = event.getEventTime() - mLastUpMillis; |
| final long millisBetweenLastDownAndLastUp = mLastUpMillis - mLastDownMillis; |
| |
| // Detect double tap and triple click. |
| if (millisSinceLastUp <= ViewConfiguration.getDoubleTapTimeout() |
| && millisBetweenLastDownAndLastUp <= ViewConfiguration.getDoubleTapTimeout() |
| && (mMultiTapStatus == MultiTapStatus.FIRST_TAP |
| || (mMultiTapStatus == MultiTapStatus.DOUBLE_TAP && isMouse))) { |
| if (mMultiTapStatus == MultiTapStatus.FIRST_TAP) { |
| mMultiTapStatus = MultiTapStatus.DOUBLE_TAP; |
| } else { |
| mMultiTapStatus = MultiTapStatus.TRIPLE_CLICK; |
| } |
| mMultiTapInSameArea = isDistanceWithin(mLastDownX, mLastDownY, |
| event.getX(), event.getY(), config.getScaledDoubleTapSlop()); |
| if (TextView.DEBUG_CURSOR) { |
| String status = isDoubleTap() ? "double" : "triple"; |
| String inSameArea = mMultiTapInSameArea ? "in same area" : "not in same area"; |
| logCursor("EditorTouchState", "ACTION_DOWN: %s tap detected, %s", |
| status, inSameArea); |
| } |
| } else { |
| mMultiTapStatus = MultiTapStatus.FIRST_TAP; |
| mMultiTapInSameArea = false; |
| if (TextView.DEBUG_CURSOR) { |
| logCursor("EditorTouchState", "ACTION_DOWN: first tap detected"); |
| } |
| } |
| mLastDownX = event.getX(); |
| mLastDownY = event.getY(); |
| mLastDownMillis = event.getEventTime(); |
| mMovedEnoughForDrag = false; |
| mIsDragCloseToVertical = false; |
| } else if (action == MotionEvent.ACTION_UP) { |
| if (TextView.DEBUG_CURSOR) { |
| logCursor("EditorTouchState", "ACTION_UP"); |
| } |
| mLastUpX = event.getX(); |
| mLastUpY = event.getY(); |
| mLastUpMillis = event.getEventTime(); |
| mMovedEnoughForDrag = false; |
| mIsDragCloseToVertical = false; |
| } else if (action == MotionEvent.ACTION_MOVE) { |
| if (!mMovedEnoughForDrag) { |
| float deltaX = event.getX() - mLastDownX; |
| float deltaY = event.getY() - mLastDownY; |
| float deltaXSquared = deltaX * deltaX; |
| float distanceSquared = (deltaXSquared) + (deltaY * deltaY); |
| int touchSlop = config.getScaledTouchSlop(); |
| mMovedEnoughForDrag = distanceSquared > touchSlop * touchSlop; |
| if (mMovedEnoughForDrag) { |
| // If the direction of the swipe motion is within 30 degrees of vertical, it is |
| // considered a vertical drag. We don't actually have to compute the angle to |
| // implement the check though. When the angle is exactly 30 degrees from |
| // vertical, 2*deltaX = distance. When the angle is less than 30 degrees from |
| // vertical, 2*deltaX < distance. |
| mIsDragCloseToVertical = (4 * deltaXSquared) <= distanceSquared; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Returns true if the distance between the given coordinates is <= to the specified max. |
| * This is useful to be able to determine e.g. when the user's touch has moved enough in |
| * order to be considered a drag (no longer within touch slop). |
| */ |
| public static boolean isDistanceWithin(float x1, float y1, float x2, float y2, |
| int maxDistance) { |
| float deltaX = x2 - x1; |
| float deltaY = y2 - y1; |
| float distanceSquared = (deltaX * deltaX) + (deltaY * deltaY); |
| return distanceSquared <= maxDistance * maxDistance; |
| } |
| } |