src/com/owncloud/android/ui/ExtendedListView.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012 Bartek Przybylski
   3  *   Copyright (C) 2012-2013 ownCloud Inc.
   4  *
   5  *   This program is free software: you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License version 2,
   7  *   as published by the Free Software Foundation.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 package com.owncloud.android.ui;
  20
  21 import android.content.Context;
  22 import android.graphics.Canvas;
  23 import android.util.AttributeSet;
  24 import android.widget.GridView;
  25 import android.widget.ListView;
  26
  27 /**
  28  * ListView allowing to specify the position of an item that should be centered in the visible area, if possible.
  29  *
  30  * The cleanest way I found to overcome the problem due to getHeight() returns 0 until the view is really drawn.
  31  *
  32  * @author David A. Velasco
  33  */
  34 public class ExtendedListView extends GridView {
  35
  36     private int mPositionToSetAndCenter;
  37
  38     public ExtendedListView(Context context) {
  39         super(context);
  40     }
  41
  42     public ExtendedListView(Context context, AttributeSet attrs) {
  43         super(context, attrs);
  44     }
  45
  46     public ExtendedListView(Context context, AttributeSet attrs, int defStyle) {
  47         super(context, attrs, defStyle);
  48     }
  49
  50     /**
  51      * {@inheritDoc}
  52      *
  53      *
  54      */
  55     @Override
  56     protected void onDraw (Canvas canvas) {
  57         super.onDraw(canvas);
  58         if (mPositionToSetAndCenter > 0) {
  59             this.setSelection(mPositionToSetAndCenter);
  60             //this.setSelectionFromTop(mPositionToSetAndCenter, getHeight() / 2);
  61             mPositionToSetAndCenter = 0;
  62         }
  63     }
  64
  65     /**
  66      * Public method to set the position of the item that should be centered in the visible area of the view.
  67      *
  68      * The position is saved here and checked in onDraw().
  69      *
  70      * @param position         Position (in the list of items) of the item to center in the visible area.
  71      */
  72     public void setAndCenterSelection(int position) {
  73         mPositionToSetAndCenter = position;
  74     }
  75 }