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