android/view/AbstractSpinnerAdapter.java

/*
 *   JSampler - a java front-end for LinuxSampler
 *
 *   Copyright (C) 2011 Grigor Iliev <grigor@grigoriliev.com>
 *
 *   This file is part of JSampler.
 *
 *   JSampler is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2
 *   as published by the Free Software Foundation.
 *
 *   JSampler is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with JSampler; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *   MA  02111-1307  USA
 */

package org.jsampler.android.view;

import android.view.View;
import android.view.ViewGroup;
import android.widget.SpinnerAdapter;
import android.widget.TextView;

public abstract class AbstractSpinnerAdapter<I> extends AbstractListAdapter implements SpinnerAdapter {
        protected boolean useEmptyItem = true;
        
        @Override
        public View
        getDropDownView(int position, View convertView, ViewGroup parent) {
                return getView(position, convertView, parent);
        }
        
        public abstract int size();
        
        public abstract Object get(int position);
        
        @Override
        public int
        getCount() { return size() + (useEmptyItem ? 1 : 0); }
        
        @Override
        public Object
        getItem(int position) {
                return useEmptyItem ? (position == 0 ? null : get(position - 1)) : get(position);
        }
        
        public void
        setUseEmptyItem(boolean b) {
                if(b == useEmptyItem) return;
                useEmptyItem = b;
                notifyDataSetChanged();
        }
        
        /**
         * Prepares adapter for the new selection. If the item is <code>null</code>
         * an extra (empty) element will be used to represent no selection, otherwise
         * the extra element will be removed.
         * @param item The item to be selected.
         * @return
         */
        public int
        prepareForSelection(I item) {
                if(item == null) {
                        setUseEmptyItem(true);
                        return 0;
                }
                
                setUseEmptyItem(false);
                return getItemPosition(item);
        }
        
        public int
        getItemPosition(I item) {
                int idx = -1;
                for(int i = 0; i < size(); i++) {
                        if(compare((I)get(i), item)) {
                                idx = i;
                                break;
                        }
                }
                
                return idx;
        }
        
        public boolean
        compare(I item1, I item2) { return item1 == item2; }
        
        /** Gets the text to be displayed when the empty item is selected. */
        public abstract String getEmptyItemText();
        
        public String
        getItemText(int position) { return getItem(position).toString(); }
        
        @Override
        public View
        getView(int position, View convertView, ViewGroup parent) {
                TextView text;
                if(convertView != null && convertView instanceof TextView) {
                        text = (TextView) convertView;
                        
                } else {
                        text = new TextView(parent.getContext());
                        text.setFocusable(false);
                        text.setFocusableInTouchMode(false);
                        text.setClickable(false);
                }
                
                if(useEmptyItem && position == 0) text.setText(getEmptyItemText());
                else text.setText(getItemText(position));
                
                return text;
        }
}
1	/*
2	* JSampler - a java front-end for LinuxSampler
3	*
4	* Copyright (C) 2011 Grigor Iliev <grigor@grigoriliev.com>
5	*
6	* This file is part of JSampler.
7	*
8	* JSampler is free software; you can redistribute it and/or modify
9	* it under the terms of the GNU General Public License version 2
10	* as published by the Free Software Foundation.
11	*
12	* JSampler is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with JSampler; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20	* MA 02111-1307 USA
21	*/
22
23	package org.jsampler.android.view;
24
25	import android.view.View;
26	import android.view.ViewGroup;
27	import android.widget.SpinnerAdapter;
28	import android.widget.TextView;
29
30	public abstract class AbstractSpinnerAdapter<I> extends AbstractListAdapter implements SpinnerAdapter {
31	protected boolean useEmptyItem = true;
32
33	@Override
34	public View
35	getDropDownView(int position, View convertView, ViewGroup parent) {
36	return getView(position, convertView, parent);
37	}
38
39	public abstract int size();
40
41	public abstract Object get(int position);
42
43	@Override
44	public int
45	getCount() { return size() + (useEmptyItem ? 1 : 0); }
46
47	@Override
48	public Object
49	getItem(int position) {
50	return useEmptyItem ? (position == 0 ? null : get(position - 1)) : get(position);
51	}
52
53	public void
54	setUseEmptyItem(boolean b) {
55	if(b == useEmptyItem) return;
56	useEmptyItem = b;
57	notifyDataSetChanged();
58	}
59
60	/**
61	* Prepares adapter for the new selection. If the item is <code>null</code>
62	* an extra (empty) element will be used to represent no selection, otherwise
63	* the extra element will be removed.
64	* @param item The item to be selected.
65	* @return
66	*/
67	public int
68	prepareForSelection(I item) {
69	if(item == null) {
70	setUseEmptyItem(true);
71	return 0;
72	}
73
74	setUseEmptyItem(false);
75	return getItemPosition(item);
76	}
77
78	public int
79	getItemPosition(I item) {
80	int idx = -1;
81	for(int i = 0; i < size(); i++) {
82	if(compare((I)get(i), item)) {
83	idx = i;
84	break;
85	}
86	}
87
88	return idx;
89	}
90
91	public boolean
92	compare(I item1, I item2) { return item1 == item2; }
93
94	/** Gets the text to be displayed when the empty item is selected. */
95	public abstract String getEmptyItemText();
96
97	public String
98	getItemText(int position) { return getItem(position).toString(); }
99
100	@Override
101	public View
102	getView(int position, View convertView, ViewGroup parent) {
103	TextView text;
104	if(convertView != null && convertView instanceof TextView) {
105	text = (TextView) convertView;
106
107	} else {
108	text = new TextView(parent.getContext());
109	text.setFocusable(false);
110	text.setFocusableInTouchMode(false);
111	text.setClickable(false);
112	}
113
114	if(useEmptyItem && position == 0) text.setText(getEmptyItemText());
115	else text.setText(getItemText(position));
116
117	return text;
118	}
119	}