TextViewFixTouchConsume.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2015 Umeng, Inc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.umeng.comm.ui.widgets;

import android.content.Context;
import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.method.LinkMovementMethod;
import android.text.method.Touch;
import android.text.style.ClickableSpan;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.TextView;

import com.umeng.comm.ui.emoji.EmojiHandler;

/**
 * 修正使用Span渲染文本时，点击非好友文本区域，item无法接收到事件问题。
 */
public class TextViewFixTouchConsume extends TextView {
    /**
     * 点击非Url时，不consume此事件
     */
    private boolean mDontConsumeNonUrlClicks = true;
    private boolean mlinkHit;

    private int mTextStart = 0;
    private int mTextLength = -1;
    
    private int mExpectSize = 0;

    public TextViewFixTouchConsume(Context context) {
        super(context);
        init();
    }

    public TextViewFixTouchConsume(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public TextViewFixTouchConsume(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        mExpectSize = (int) Math.max(65, getTextSize());
        mTextStart = 0;
        mTextLength = -1;
        setText(getText());
    }

    @Override
    public void setText(CharSequence text, BufferType type) {
        if (!TextUtils.isEmpty(text)) {
            SpannableStringBuilder builder = new SpannableStringBuilder(text);
            EmojiHandler.addEmojis(getContext(), builder, mExpectSize, mExpectSize,
                    mTextStart, mTextLength);
            text = builder;
        }
        super.setText(text, type);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mlinkHit = false;
        boolean res = super.onTouchEvent(event);

        if (mDontConsumeNonUrlClicks)
            return mlinkHit;
        return res;
    }

    /**
     * 处理onTouchEvent，判断touch位置是否是好友名的位置
     */
    public static class LocalLinkMovementMethod extends LinkMovementMethod {
        static LocalLinkMovementMethod sInstance;

        public static LocalLinkMovementMethod getInstance() {
            if (sInstance == null)
                sInstance = new LocalLinkMovementMethod();

            return sInstance;
        }

        @Override
        public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
            int action = event.getAction();

            if (action == MotionEvent.ACTION_UP ||
                    action == MotionEvent.ACTION_DOWN) {
                int x = (int) event.getX();
                int y = (int) event.getY();

                x -= widget.getTotalPaddingLeft();
                y -= widget.getTotalPaddingTop();

                x += widget.getScrollX();
                y += widget.getScrollY();

                Layout layout = widget.getLayout();
                int line = layout.getLineForVertical(y);
                int off = layout.getOffsetForHorizontal(line, x);

                ClickableSpan[] link = buffer.getSpans(off, off, ClickableSpan.class);

                if (link.length != 0) {
                    if (action == MotionEvent.ACTION_UP) {
                        link[0].onClick(widget);
                    } else if (action == MotionEvent.ACTION_DOWN) {
                        Selection.setSelection(buffer,
                                buffer.getSpanStart(link[0]),
                                buffer.getSpanEnd(link[0]));
                    }

                    if (widget instanceof TextViewFixTouchConsume) {
                        ((TextViewFixTouchConsume) widget).mlinkHit = true;
                    }
                    return true;
                } else {
                    Selection.removeSelection(buffer);
                    Touch.onTouchEvent(widget, buffer, event);
                    return false;
                }
            }
            return Touch.onTouchEvent(widget, buffer, event);
        }
    }
}