package com.xinxin.everyxday.widget;
import android.content.ClipboardManager;
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
* 对齐的TextView
* <p>
* 为了能够使TextView能够很好的进行排版,同时考虑到原生TextView中以word进行分割排版,
* 那么我们可以将要换行的地方进行添加空格处理,这样就可以在合适的位置换行,同时也不会
* 打乱原生的TextView的排版换行选择复制等问题。为了能够使右端尽可能的对齐,将右侧多出的空隙
* 尽可能的分配到该行的标点后面。达到两段对齐的效果。
* </p>
* Created by yuedong.lyd on 6/28/15.
*/
public class CBAlignTextView extends TextView {
private List<Integer> addCharPosition = new ArrayList<Integer>(); //增加空格的位置
private final char SPACE = ' '; //空格;
private CharSequence oldText = ""; //旧文本,本来应该显示的文本
private CharSequence newText = ""; //新文本,真正显示的文本
private boolean inProcess = false; //旧文本是否已经处理为新文本
private static List<Character> punctuation = new ArrayList<Character>(); //标点符号
//标点符号用于在textview右侧多出空间时,将空间加到标点符号的后面
static {
punctuation.clear();
punctuation.add(',');
punctuation.add('.');
punctuation.add('?');
punctuation.add('!');
punctuation.add(';');
punctuation.add(')');
punctuation.add(']');
punctuation.add('}');
punctuation.add(',');
punctuation.add('。');
punctuation.add('?');
punctuation.add('!');
punctuation.add(';');
punctuation.add(')');
punctuation.add('}');
}
public CBAlignTextView(Context context) {
super(context);
}
public CBAlignTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* 监听文本复制,对于复制的文本进行空格剔除
*
* @param id 操作id(复制,全部选择等)
* @return 是否操作成功
*/
@Override
public boolean onTextContextMenuItem(int id) {
if (id == android.R.id.copy) {
if (isFocused()) {
final int selStart = getSelectionStart();
final int selEnd = getSelectionEnd();
int min = Math.max(0, Math.min(selStart, selEnd));
int max = Math.max(0, Math.max(selStart, selEnd));
//利用反射获取选择的文本信息,同时关闭操作框
try {
Class cls = getClass().getSuperclass();
Method getSelectTextMethod = cls.getDeclaredMethod("getTransformedText", new
Class[]{int.class, int.class});
getSelectTextMethod.setAccessible(true);
CharSequence selectedText = (CharSequence) getSelectTextMethod.invoke(this,
min, max);
Method closeMenuMethod = cls.getDeclaredMethod("stopSelectionActionMode");
closeMenuMethod.setAccessible(true);
closeMenuMethod.invoke(this);
copy(selectedText.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
return true;
} else {
return super.onTextContextMenuItem(id);
}
}
/**
* 复制文本到剪切板,去除添加字符
*
* @param text 文本
*/
private void copy(String text) {
ClipboardManager clipboard = (ClipboardManager) getContext().getSystemService(Context
.CLIPBOARD_SERVICE);
int start = newText.toString().indexOf(text);
int end = start + text.length();
StringBuilder sb = new StringBuilder(text);
for (int i = addCharPosition.size() - 1; i >= 0; i--) {
int position = addCharPosition.get(i);
if (position < end && position >= start) {
sb.deleteCharAt(position - start);
}
}
android.content.ClipData clip = android.content.ClipData.newPlainText(null, sb.toString());
clipboard.setPrimaryClip(clip);
}
/**
* 处理多行文本
*
* @param paint 画笔
* @param text 文本
* @param width 最大宽度
* @return 处理后的文本
*/
private String processText(Paint paint, String text, int width) {
if (text == null || text.length() == 0) {
return "";
}
String[] lines = text.split("\\n");
StringBuilder newText = new StringBuilder();
for (String line : lines) {
newText.append('\n');
newText.append(processLine(paint, line, width - getPaddingLeft() - getPaddingRight()));
}
newText.deleteCharAt(0);
return newText.toString();
}
/**
* 处理单行文本
*
* @param paint 画笔
* @param text 文本
* @param width 最大宽度
* @return 处理后的文本
*/
private String processLine(Paint paint, String text, int width) {
if (text == null || text.length() == 0) {
return "";
}
StringBuilder old = new StringBuilder(text);
int startPosition = 0; // 起始位置
float chineseWidth = paint.measureText("中");
float spaceWidth = paint.measureText(SPACE + "");
//最大可容纳的汉字,每一次从此位置向后推进计算
int maxChineseCount = (int) (width / chineseWidth);
//减少一个汉字宽度,保证每一行前后都有一个空格
maxChineseCount--;
addCharPosition.clear();
for (int i = maxChineseCount; i < old.length(); i++) {
if (paint.measureText(old.substring(startPosition, i + 1)) > width - spaceWidth) {
//右侧多余空隙宽度
float gap = (width - spaceWidth - paint.measureText(old.substring(startPosition,
i)));
List<Integer> positions = new ArrayList<Integer>();
for (int j = startPosition; j < i; j++) {
char ch = old.charAt(j);
if (punctuation.contains(ch)) {
positions.add(j + 1);
}
}
//空隙最多可以使用几个空格替换
int number = (int) (gap / spaceWidth);
//多增加的空格数量
int use = 0;
if (positions.size() > 0) {
for (int k = 0; k < positions.size() && number > 0; k++) {
int times = number / (positions.size() - k);
int position = positions.get(k / positions.size());
for (int m = 0; m < times; m++) {
old.insert(position + m, SPACE);
addCharPosition.add(position + m);
use++;
number--;
}
}
}
//指针移动,将段尾添加空格进行分行处理
i = i + use;
old.insert(i, SPACE);
addCharPosition.add(i);
startPosition = i + 1;
i = startPosition + maxChineseCount;
}
}
return old.toString();
}
@Override
public void setText(CharSequence text, BufferType type) {
if (!inProcess) {
oldText = text;
}
super.setText(text, type);
}
/**
* 获取真正的text
*
* @return 返回text
*/
public CharSequence getRealText() {
return oldText;
}
/**
* TextView在绘制的时候会经过measure,layout,draw阶段,在measure阶段TextView的
* 宽度是不一定能获取到的,可能获取的是0,而在layout与draw阶段都可以获取到,windowFocus
* 在draw阶段之后,所以在此进行文本的转化,当然也可以在layout等阶段进行
*
* @param hasWindowFocus 是否获取窗口焦点
*/
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
if (!inProcess && oldText != null && oldText.length() != 0) {
newText = processText(getPaint(), oldText.toString(), getWidth());
setText(newText);
int spaceWidth = (int) (getPaint().measureText(SPACE + ""));
setPadding(getPaddingLeft() + spaceWidth, getPaddingTop(), getPaddingRight(),
getPaddingBottom());
inProcess = true;
}
super.onWindowFocusChanged(hasWindowFocus);
}
}