xiaomi-note/week-01/ui/NoteEditText.java

/*
 * 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.os.Bundle;
import android.os.Parcelable;
import android.support.v7.widget.AppCompatEditText;
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.MotionEvent;

import net.micode.notes.R;
import net.micode.notes.tool.EditTextManager;

import java.util.HashMap;
import java.util.Map;


public class NoteEditText extends AppCompatEditText {
    private static final String TAG = "NoteEditText";
    private static final String SCHEME_TEL = "tel:";
    private static final String SCHEME_HTTP = "http:";
    private static final String SCHEME_EMAIL = "mailto:";
    private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>();
    private static final String KEY_SUPER = "KEY_SUPER";
    private static final String KEY_OPT = EditTextManager.class.getCanonicalName();

    static {
        sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel);  //添加键值对
        sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web);
        sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email);
    }

    /*操作管理器*/
    private EditTextManager mgr;
    private int mIndex;
    private int mSelectionStartBeforeDelete;
    private OnTextViewChangeListener mOnTextViewChangeListener;

    public NoteEditText(Context context) {
        super(context, null);

        mIndex = 0;
        initEditManager();
    }

    public NoteEditText(Context context, AttributeSet attrs) {
        super(context, attrs, android.R.attr.editTextStyle);
        initEditManager();
    }

    public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initEditManager();
    }

    public void setIndex(int index) {
        mIndex = index;
    }

    public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
        mOnTextViewChangeListener = listener;
    }

    /*撤销*/
    public boolean undo() {
        return mgr.undo();
    }

    /*反撤销*/
    public boolean redo() {
        return mgr.redo();
    }

    /*初始化操作管理器记录每一次的编辑操作用于撤销和反撤销*/
    private void initEditManager() {
        mgr = new EditTextManager(this);
        addTextChangedListener(mgr);
    }

    @Override
    public Parcelable onSaveInstanceState() {
        Bundle bundle = new Bundle();
        bundle.putParcelable(KEY_SUPER, super.onSaveInstanceState());
        bundle.putBundle(KEY_OPT, mgr.exportState());
        return bundle;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        Bundle bundle = (Bundle) state;
        Parcelable superState = bundle.getParcelable(KEY_SUPER);
        mgr.disable();
        super.onRestoreInstanceState(superState);
        mgr.enable();
        mgr.importState(bundle.getBundle(KEY_OPT));
    }


    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:

                int x = (int) event.getX();
                int y = (int) event.getY();
                x -= getTotalPaddingLeft();
                y -= getTotalPaddingTop();
                x += getScrollX();
                y += getScrollY();

                Layout layout = getLayout();
                int line = layout.getLineForVertical(y);
                int off = layout.getOffsetForHorizontal(line, x);
                Selection.setSelection(getText(), off);
                break;
        }

        return super.onTouchEvent(event);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_ENTER:
                if (mOnTextViewChangeListener != null) {
                    return false;
                }
                break;
            case KeyEvent.KEYCODE_DEL:
                mSelectionStartBeforeDelete = getSelectionStart();
                break;
            default:
                break;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_DEL:
                if (mOnTextViewChangeListener != null) {
                    if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
                        mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
                        return true;
                    }
                } else {
                    Log.d(TAG, "OnTextViewChangeListener was not seted");
                }
                break;
            case KeyEvent.KEYCODE_ENTER:
                if (mOnTextViewChangeListener != null) {
                    int selectionStart = getSelectionStart();
                    String text = getText().subSequence(selectionStart, length()).toString();
                    setText(getText().subSequence(0, selectionStart));
                    mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text);
                } 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) {
        if (mOnTextViewChangeListener != null) {
            if (!focused && TextUtils.isEmpty(getText())) {
                mOnTextViewChangeListener.onTextChange(mIndex, false);
            } else {
                mOnTextViewChangeListener.onTextChange(mIndex, true);
            }
        }
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
    }

    @Override
    protected void onCreateContextMenu(ContextMenu menu) {
        if (getText() instanceof Spanned) {
            int selStart = getSelectionStart();
            int selEnd = getSelectionEnd();

            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) {
                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_web;
                }
                /*直接打开网页*/
                urls[0].onClick(NoteEditText.this);
            }
        }
        super.onCreateContextMenu(menu);
    }

    /**
     * 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);
    }
}