/** * Copyright (C) 2016 Hyphenate Inc. All rights reserved. * * 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 com.fanxin.easeui.widget; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Align; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.widget.HeaderViewListAdapter; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SectionIndexer; import android.widget.TextView; import com.hyphenate.easeui.R; import com.hyphenate.util.DensityUtil; public class EaseSidebar extends View{ private Paint paint; private TextView header; private float height; private ListView mListView; private Context context; private SectionIndexer sectionIndexter = null; public void setListView(ListView listView){ mListView = listView; } public EaseSidebar(Context context, AttributeSet attrs) { super(context, attrs); this.context = context; init(); } private String[] sections; private void init(){ String st = context.getString(R.string.search_new); sections= new String[]{st,"A","B","C","D","E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z","#"}; paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setColor(Color.parseColor("#8C8C8C")); paint.setTextAlign(Align.CENTER); paint.setTextSize(DensityUtil.sp2px(context, 10)); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); float center = getWidth() / 2; height = getHeight() / sections.length; for (int i = sections.length - 1; i > -1; i--) { canvas.drawText(sections[i], center, height * (i+1), paint); } } private int sectionForPoint(float y) { int index = (int) (y / height); if(index < 0) { index = 0; } if(index > sections.length - 1){ index = sections.length - 1; } return index; } private void setHeaderTextAndscroll(MotionEvent event){ if (mListView == null) { //check the mListView to avoid NPE. but the mListView shouldn't be null //need to check the call stack later return; } String headerString = sections[sectionForPoint(event.getY())]; header.setText(headerString); ListAdapter adapter = mListView.getAdapter(); if(sectionIndexter == null){ if(adapter instanceof HeaderViewListAdapter){ sectionIndexter = (SectionIndexer) ((HeaderViewListAdapter) adapter).getWrappedAdapter(); }else if(adapter instanceof SectionIndexer){ sectionIndexter = (SectionIndexer)adapter; }else{ throw new RuntimeException("listview sets adpater does not implement SectionIndexer interface"); } } String[] adapterSections = (String[]) sectionIndexter.getSections(); try { for (int i = adapterSections.length - 1; i > -1; i--) { if(adapterSections[i].equals(headerString)){ mListView.setSelection(sectionIndexter.getPositionForSection(i)); break; } } } catch (Exception e) { Log.e("setHeaderTextAndscroll", e.getMessage()); } } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN:{ if(header == null){ header = (TextView) ((View)getParent()).findViewById(R.id.floating_header); } setHeaderTextAndscroll(event); header.setVisibility(View.VISIBLE); setBackgroundResource(R.drawable.ease_sidebar_background_pressed); return true; } case MotionEvent.ACTION_MOVE:{ setHeaderTextAndscroll(event); return true; } case MotionEvent.ACTION_UP: header.setVisibility(View.INVISIBLE); setBackgroundColor(Color.TRANSPARENT); return true; case MotionEvent.ACTION_CANCEL: header.setVisibility(View.INVISIBLE); setBackgroundColor(Color.TRANSPARENT); return true; } return super.onTouchEvent(event); } }