80 lines
2.7 KiB
Java
80 lines
2.7 KiB
Java
/*
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* Copyright (C) 2018 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.setupwizardlib.view;
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import android.text.Selection;
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import android.text.Spannable;
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import android.text.method.LinkMovementMethod;
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import android.text.method.MovementMethod;
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import android.view.MotionEvent;
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import android.widget.TextView;
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/**
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* A movement method that tracks the last result of whether touch events are handled. This is used
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* to patch the return value of {@link TextView#onTouchEvent} so that it consumes the touch events
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* only when the movement method says the event is consumed.
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*/
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public interface TouchableMovementMethod {
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/** @return The last touch event received in {@link MovementMethod#onTouchEvent} */
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MotionEvent getLastTouchEvent();
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/**
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* @return The return value of the last {@link MovementMethod#onTouchEvent}, or whether the last
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* touch event should be considered handled by the text view
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*/
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boolean isLastTouchEventHandled();
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/**
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* An extension of LinkMovementMethod that tracks whether the event is handled when it is touched.
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*/
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class TouchableLinkMovementMethod extends LinkMovementMethod implements TouchableMovementMethod {
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public static TouchableLinkMovementMethod getInstance() {
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return new TouchableLinkMovementMethod();
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}
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boolean lastEventResult = false;
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MotionEvent lastEvent;
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@Override
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public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
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lastEvent = event;
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boolean result = super.onTouchEvent(widget, buffer, event);
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if (event.getAction() == MotionEvent.ACTION_DOWN) {
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// Unfortunately, LinkMovementMethod extends ScrollMovementMethod, and it always
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// consume the down event. So here we use the selection instead as a hint of whether
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// the down event landed on a link.
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lastEventResult = Selection.getSelectionStart(buffer) != -1;
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} else {
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lastEventResult = result;
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}
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return result;
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}
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@Override
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public MotionEvent getLastTouchEvent() {
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return lastEvent;
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}
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@Override
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public boolean isLastTouchEventHandled() {
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return lastEventResult;
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}
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}
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}
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