/* * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) * * 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 net.micode.notes.ui; import android.content.Context; import android.graphics.Rect; import android.text.Layout; import android.text.Selection; import android.text.Spanned; import android.text.TextUtils; import android.text.style.URLSpan; import android.util.AttributeSet; import android.util.Log; import android.view.ContextMenu; import android.view.KeyEvent; import android.view.MenuItem; import android.view.MenuItem.OnMenuItemClickListener; import android.view.MotionEvent; import android.widget.EditText; import net.micode.notes.R; import java.util.HashMap; import java.util.Map; /** * 自定义EditText，用于笔记编辑界面 * 扩展功能包括：支持链接识别、回车换行处理、删除空行处理等 */ public class NoteEditText extends EditText { private static final String TAG = "NoteEditText"; private int mIndex;// 当前EditText在列表中的索引位置 private int mSelectionStartBeforeDelete;// 删除操作前的光标起始位置 // 链接协议常量 private static final String SCHEME_TEL = "tel:" ; private static final String SCHEME_HTTP = "http:" ; private static final String SCHEME_EMAIL = "mailto:" ; // 链接协议与对应菜单资源ID的映射 private static final Map sSchemaActionResMap = new HashMap(); static { sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel); sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web); sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email); } /** * Call by the {@link NoteEditActivity} to delete or add edit text */ public interface OnTextViewChangeListener { /** * Delete current edit text when {@link KeyEvent#KEYCODE_DEL} happens * and the text is null */ void onEditTextDelete(int index, String text); /** * Add edit text after current edit text when {@link KeyEvent#KEYCODE_ENTER} * happen */ void onEditTextEnter(int index, String text); /** * Hide or show item option when text change */ void onTextChange(int index, boolean hasText); } private OnTextViewChangeListener mOnTextViewChangeListener; //构造方法 public NoteEditText(Context context) { super(context, null); mIndex = 0; } // 设置当前EditText索引 public void setIndex(int index) { mIndex = index; } // 设置文本变化监听器 public void setOnTextViewChangeListener(OnTextViewChangeListener listener) { mOnTextViewChangeListener = listener; } public NoteEditText(Context context, AttributeSet attrs) { super(context, attrs, android.R.attr.editTextStyle); } public NoteEditText(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub } @Override public boolean onTouchEvent(MotionEvent event) { // 处理触摸事件，精确定位光标位置 switch (event.getAction()) { case MotionEvent.ACTION_DOWN: // 计算触摸点坐标（考虑padding和滚动偏移） int x = (int) event.getX(); int y = (int) event.getY(); x -= getTotalPaddingLeft(); y -= getTotalPaddingTop(); x += getScrollX(); y += getScrollY(); // 获取触摸点对应的文本位置 Layout layout = getLayout(); int line = layout.getLineForVertical(y); int off = layout.getOffsetForHorizontal(line, x); Selection.setSelection(getText(), off);// 设置光标位置 break; } return super.onTouchEvent(event); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { // 按键按下事件处理 switch (keyCode) { case KeyEvent.KEYCODE_ENTER://回车键 if (mOnTextViewChangeListener != null) { return false;// 交给onKeyUp处理 } break; case KeyEvent.KEYCODE_DEL://删除键 mSelectionStartBeforeDelete = getSelectionStart();// 记录删除前光标位置 break; default: break; } return super.onKeyDown(keyCode, event); } @Override public boolean onKeyUp(int keyCode, KeyEvent event) { // 按键释放事件处理 switch(keyCode) { case KeyEvent.KEYCODE_DEL://删除键 if (mOnTextViewChangeListener != null) { // 如果光标在开头且不是第一个EditText，则删除当前EditText if (0 == mSelectionStartBeforeDelete && mIndex != 0) { mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString()); return true;// 已处理，不继续传递 } } else { Log.d(TAG, "OnTextViewChangeListener was not seted"); } break; case KeyEvent.KEYCODE_ENTER:// 回车键 if (mOnTextViewChangeListener != null) { // 从光标处分割文本，后半部分放入新EditText int selectionStart = getSelectionStart(); String text = getText().subSequence(selectionStart, length()).toString(); setText(getText().subSequence(0, selectionStart));// 保留前半部分 mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text);// 创建新EditText } else { Log.d(TAG, "OnTextViewChangeListener was not seted"); } break; default: break; } return super.onKeyUp(keyCode, event); } @Override protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) { // 焦点变化时通知监听器 if (mOnTextViewChangeListener != null) { if (!focused && TextUtils.isEmpty(getText())) { mOnTextViewChangeListener.onTextChange(mIndex, false); // 无文本 } else { mOnTextViewChangeListener.onTextChange(mIndex, true); // 有文本 } } super.onFocusChanged(focused, direction, previouslyFocusedRect); } @Override protected void onCreateContextMenu(ContextMenu menu) { // 创建上下文菜单（长按弹出） if (getText() instanceof Spanned) { int selStart = getSelectionStart(); int selEnd = getSelectionEnd(); // 获取选中范围的URL链接 int min = Math.min(selStart, selEnd); int max = Math.max(selStart, selEnd); final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class); if (urls.length == 1) { // 根据URL类型添加对应的菜单项 int defaultResId = 0; for(String schema: sSchemaActionResMap.keySet()) { if(urls[0].getURL().indexOf(schema) >= 0) { defaultResId = sSchemaActionResMap.get(schema); break; } } if (defaultResId == 0) { defaultResId = R.string.note_link_other; // 默认菜单项 } // 添加菜单项并设置点击事件 menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener( new OnMenuItemClickListener() { public boolean onMenuItemClick(MenuItem item) { // goto a new intent urls[0].onClick(NoteEditText.this); return true; } }); } } super.onCreateContextMenu(menu); } }