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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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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 net.micode.notes.ui;/*定义包名 net.micode.notes.ui*/
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import android.content.Context;
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import android.graphics.Rect;
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import android.text.Layout;
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import android.text.Selection;
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import android.text.Spanned;
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import android.text.TextUtils;
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import android.text.style.URLSpan;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.ContextMenu;
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import android.view.KeyEvent;
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import android.view.MenuItem;
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import android.view.MenuItem.OnMenuItemClickListener;
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import android.view.MotionEvent;
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import android.widget.EditText;/*导入所需的 Android 库文件*/
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import net.micode.notes.R;/*导入应用的资源文件*/
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import java.util.HashMap;/*导入 Java 的 HashMap 类*/
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import java.util.Map;
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public class NoteEditText extends EditText { /*定义 NoteEditText 类，继承自 EditText*/
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private static final String TAG = "NoteEditText"; /*定义一个用于日志输出的标签字符串*/
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private int mIndex;
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private int mSelectionStartBeforeDelete; /*定义两个私有变量，mIndex 用于存储当前文本框的索引，mSelectionStartBeforeDelete 用于存储删除键按下之前的选择起始位置。*/
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private static final String SCHEME_TEL = "tel:" ;
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private static final String SCHEME_HTTP = "http:" ;
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private static final String SCHEME_EMAIL = "mailto:" ; /*定义几个常量字符串，表示不同的 URL 协议*/
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private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
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static {
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sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel);
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sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web);
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sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email);
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} /*定义一个静态的哈希映射表，用于存储不同 URL 协议到资源 ID 的映射。*/
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/**
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* Call by the {@link NoteEditActivity} to delete or add edit text
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*/
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public interface OnTextViewChangeListener {
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/**
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* Delete current edit text when {@link KeyEvent#KEYCODE_DEL} happens
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* and the text is null
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*/
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void onEditTextDelete(int index, String text);
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/**
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* Add edit text after current edit text when {@link KeyEvent#KEYCODE_ENTER}
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* happen
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*/
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void onEditTextEnter(int index, String text);
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/**
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* Hide or show item option when text change
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*/
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void onTextChange(int index, boolean hasText);
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} /*定义一个内部接口 OnTextViewChangeListener，包含三个方法，用于通知监听器文本框的删除、添加及文本变化。*/
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private OnTextViewChangeListener mOnTextViewChangeListener; /*定义一个私有变量，用于存储 OnTextViewChangeListener 的实例*/
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public NoteEditText(Context context) {
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super(context, null);
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mIndex = 0;
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} /*构造函数，使用给定的上下文初始化 NoteEditText*/
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public void setIndex(int index) {
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mIndex = index;
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} /*设置当前文本框的索引*/
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public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
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mOnTextViewChangeListener = listener;
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} /*设置监听器实例*/
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public NoteEditText(Context context, AttributeSet attrs) {
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super(context, attrs, android.R.attr.editTextStyle);
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} /*构造函数，使用给定的上下文和属性集初始化 NoteEditText*/
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public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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// TODO Auto-generated constructor stub
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} /*构造函数，使用给定的上下文、属性集和默认样式初始化 NoteEditText*/
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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int x = (int) event.getX();
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int y = (int) event.getY();
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x -= getTotalPaddingLeft();
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y -= getTotalPaddingTop();
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x += getScrollX();
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y += getScrollY();
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Layout layout = getLayout();
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int line = layout.getLineForVertical(y);
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int off = layout.getOffsetForHorizontal(line, x);
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Selection.setSelection(getText(), off);
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break;
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}
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return super.onTouchEvent(event);
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} /*重写 onTouchEvent 方法，处理触摸事件，特别是按下时设置文本选择的位置*/
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@Override
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public boolean onKeyDown(int keyCode, KeyEvent event) {
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switch (keyCode) {
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case KeyEvent.KEYCODE_ENTER:
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if (mOnTextViewChangeListener != null) {
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return false;
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}
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break;
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case KeyEvent.KEYCODE_DEL:
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mSelectionStartBeforeDelete = getSelectionStart();
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break;
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default:
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break;
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}
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return super.onKeyDown(keyCode, event);
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} /*重写 onKeyDown 方法，处理按键按下事件，特别记录删除键按下时的选择起始位置。*/
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@Override
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public boolean onKeyUp(int keyCode, KeyEvent event) {
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switch(keyCode) {
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case KeyEvent.KEYCODE_DEL:
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if (mOnTextViewChangeListener != null) {
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if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
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mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
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return true;
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}
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} else {
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Log.d(TAG, "OnTextViewChangeListener was not seted");
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}
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break;
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case KeyEvent.KEYCODE_ENTER:
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if (mOnTextViewChangeListener != null) {
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int selectionStart = getSelectionStart();
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String text = getText().subSequence(selectionStart, length()).toString();
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setText(getText().subSequence(0, selectionStart));
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mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text);
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} else {
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Log.d(TAG, "OnTextViewChangeListener was not seted");
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}
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break;
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default:
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break;
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}
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return super.onKeyUp(keyCode, event);
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} /*重写 onKeyUp 方法，处理按键释放事件，特别是处理删除键和回车键的操作*/
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@Override
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protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
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if (mOnTextViewChangeListener != null) {
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if (!focused && TextUtils.isEmpty(getText())) {
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mOnTextViewChangeListener.onTextChange(mIndex, false);
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} else {
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mOnTextViewChangeListener.onTextChange(mIndex, true);
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}
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}
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super.onFocusChanged(focused, direction, previouslyFocusedRect);
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} /*重写 onFocusChanged 方法，当焦点改变时通知监听器文本框的状态。*/
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@Override
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protected void onCreateContextMenu(ContextMenu menu) {
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if (getText() instanceof Spanned) {
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int selStart = getSelectionStart();
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int selEnd = getSelectionEnd();
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int min = Math.min(selStart, selEnd);
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int max = Math.max(selStart, selEnd);
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final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
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if (urls.length == 1) {
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int defaultResId = 0;
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for(String schema: sSchemaActionResMap.keySet()) {
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if(urls[0].getURL().indexOf(schema) >= 0) {
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defaultResId = sSchemaActionResMap.get(schema);
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break;
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}
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}
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if (defaultResId == 0) {
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defaultResId = R.string.note_link_other;
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}
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menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
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new OnMenuItemClickListener() {
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public boolean onMenuItemClick(MenuItem item) {
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// goto a new intent
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urls[0].onClick(NoteEditText.this);
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return true;
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}
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});
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}
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}
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super.onCreateContextMenu(menu);
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} /*重写 onCreateContextMenu 方法，当创建上下文菜单时，根据选定的链接类型添加相应的菜单项。*/
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}
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