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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;
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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;
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import net.micode.notes.R;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* 自定义的可编辑文本视图，支持文本变化监听、删除和新增文本事件。
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*/
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public class NoteEditText extends EditText {
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private static final String TAG = "NoteEditText";
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private int mIndex; // 当前文本视图的索引
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private int mSelectionStartBeforeDelete; // 删除操作前的选择起始位置
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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:";
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// URL方案与对应操作资源ID的映射
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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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}
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/**
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* 文本视图变化监听接口。
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*/
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public interface OnTextViewChangeListener {
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/**
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* 当按下删除键且文本为空时，删除当前文本视图。
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*/
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void onEditTextDelete(int index, String text);
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/**
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* 当按下回车键时，新增一个文本视图。
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*/
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void onEditTextEnter(int index, String text);
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/**
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* 当文本变化时，隐藏或显示项目选项。
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*/
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void onTextChange(int index, boolean hasText);
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}
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private OnTextViewChangeListener mOnTextViewChangeListener;
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/**
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* 构造函数，初始化编辑文本视图。
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*
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* @param context 上下文对象
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*/
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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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}
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/**
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* 设置当前文本视图的索引。
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*
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* @param index 当前文本视图的索引
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*/
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public void setIndex(int index) {
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mIndex = index;
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}
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/**
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* 设置文本视图变化监听器。
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*
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* @param listener 文本视图变化监听器
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*/
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public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
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mOnTextViewChangeListener = listener;
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}
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/**
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* 构造函数，初始化编辑文本视图。
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*
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* @param context 上下文对象
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* @param attrs 属性集
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*/
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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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}
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/**
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* 构造函数，初始化编辑文本视图。
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*
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* @param context 上下文对象
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* @param attrs 属性集
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* @param defStyle 样式
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*/
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public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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/**
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* 处理触摸事件，调整光标位置。
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*/
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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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// 计算触摸位置相对于文本的偏移量，并调整光标位置
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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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}
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/**
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* 处理键盘按下事件。
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*/
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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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// 处理回车键事件，准备新增文本视图
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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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// 记录删除操作前的选择位置
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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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}
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/**
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* 处理键盘弹起事件。
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*/
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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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// 处理删除键事件，若为首个文本且非空，则删除当前文本
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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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// 处理回车键事件，新增文本视图
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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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}
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/**
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* 当焦点变化时，通知文本变化情况。
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*/
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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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}
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/**
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* 创建上下文菜单，支持点击URL跳转。
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*/
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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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// 跳转到URL指向的页面
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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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}
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}
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