/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.wm;
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import static android.view.InputDevice.SOURCE_CLASS_POINTER;
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import static android.view.MotionEvent.ACTION_CANCEL;
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import static android.view.MotionEvent.ACTION_DOWN;
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import static android.view.MotionEvent.ACTION_MOVE;
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import static android.view.MotionEvent.ACTION_UP;
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import static android.view.MotionEvent.BUTTON_STYLUS_PRIMARY;
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import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_DRAG;
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import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
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import android.os.Looper;
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import android.util.Slog;
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import android.view.InputChannel;
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import android.view.InputDevice;
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import android.view.InputEvent;
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import android.view.InputEventReceiver;
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import android.view.MotionEvent;
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/**
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* Input receiver for drag and drop
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*/
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class DragInputEventReceiver extends InputEventReceiver {
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private final DragDropController mDragDropController;
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// Set, if stylus button was down at the start of the drag.
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private boolean mStylusButtonDownAtStart;
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// Indicates the first event to check for button state.
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private boolean mIsStartEvent = true;
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// Set to true to ignore input events after the drag gesture is complete but the drag events
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// are still being dispatched.
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private boolean mMuteInput = false;
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DragInputEventReceiver(InputChannel inputChannel, Looper looper,
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DragDropController controller) {
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super(inputChannel, looper);
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mDragDropController = controller;
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}
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@Override
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public void onInputEvent(InputEvent event) {
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boolean handled = false;
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try {
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if (!(event instanceof MotionEvent)
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|| (event.getSource() & SOURCE_CLASS_POINTER) == 0
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|| mMuteInput) {
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return;
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}
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final MotionEvent motionEvent = (MotionEvent) event;
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final float newX = motionEvent.getRawX();
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final float newY = motionEvent.getRawY();
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final boolean isStylusButtonDown =
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(motionEvent.getButtonState() & BUTTON_STYLUS_PRIMARY) != 0;
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if (mIsStartEvent) {
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// First event and the button was down, check for the button being
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// lifted in the future, if that happens we'll drop the item.
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mStylusButtonDownAtStart = isStylusButtonDown;
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mIsStartEvent = false;
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}
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switch (motionEvent.getAction()) {
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case ACTION_DOWN:
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if (DEBUG_DRAG) Slog.w(TAG_WM, "Unexpected ACTION_DOWN in drag layer");
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return;
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case ACTION_MOVE:
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if (mStylusButtonDownAtStart && !isStylusButtonDown) {
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if (DEBUG_DRAG) {
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Slog.d(TAG_WM, "Button no longer pressed; dropping at " + newX + ","
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+ newY);
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}
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mMuteInput = true;
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}
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break;
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case ACTION_UP:
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if (DEBUG_DRAG) {
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Slog.d(TAG_WM, "Got UP on move channel; dropping at " + newX + "," + newY);
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}
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mMuteInput = true;
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break;
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case ACTION_CANCEL:
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if (DEBUG_DRAG) Slog.d(TAG_WM, "Drag cancelled!");
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mMuteInput = true;
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break;
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default:
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return;
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}
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mDragDropController.handleMotionEvent(!mMuteInput /* keepHandling */, newX, newY);
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handled = true;
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} catch (Exception e) {
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Slog.e(TAG_WM, "Exception caught by drag handleMotion", e);
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} finally {
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finishInputEvent(event, handled);
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}
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}
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}
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