view/classic/ChannelPagerActivity.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.classic;

import java.util.ArrayDeque;

import org.jsampler.CC;
import org.jsampler.android.AHF;
import org.jsampler.event.SamplerChannelListEvent;
import org.jsampler.event.SamplerChannelListListener;

import android.app.Activity;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;

public class ChannelPagerActivity extends Activity {
        private ViewPager channelPager;
        
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                
                channelPager = new ViewPager(this);
                ChannelPagerAdapter adapter = new ChannelPagerAdapter();
                channelPager.setAdapter(adapter);
                CC.getSamplerModel().addSamplerChannelListListener(adapter);
                int idx = getIntent().getExtras().getInt("org.jsampler.android.SelectedChannelID", 0);
                channelPager.setCurrentItem(idx);
                setContentView(channelPager);
        }
        
        @Override
        protected void
        onDestroy() {
                ChannelPagerAdapter adapter = (ChannelPagerAdapter)channelPager.getAdapter();
                CC.getSamplerModel().removeSamplerChannelListListener(adapter);
                super.onDestroy();
                
        }
        
        private static class ChannelViewPair {
                public Channel channel;
                public View    view;
                
                ChannelViewPair(Channel channel, View view) {
                        this.channel = channel;
                        this.view = view;
                }
        }
        
        private class ChannelPagerAdapter extends PagerAdapter implements SamplerChannelListListener {
                
                
                private ArrayDeque<View> recycledViews = new ArrayDeque<View>();
                private ChannelViewPair primaryItem = null;
                
                private ChannelsPane
                getLane() { return (ChannelsPane)AHF.getMainFrame().getSelectedChannelsPane(); }
                
                @Override
                public int
                getCount() { return getLane().getChannelCount(); }
                
                @Override
                public void startUpdate(View container) { }
                
                @Override
                public void finishUpdate(View container) {
                        if(channelPager.getCurrentItem() >= getCount()) {
                                // workaround for bug in ViewPager when the
                                // current item is the last one and a previous item is removed
                                channelPager.setCurrentItem(getCount() - 1, true);
                        }
                }
                
                @Override
                public int
                getItemPosition(Object object) { return POSITION_NONE; }
                
                @Override
                public Object
                instantiateItem(View container, int position) {
                        Channel chn = getLane().getChannel(position);
                        View view = recycledViews.pollLast();
                        chn.installView(view);
                        view = chn.getView();
                        
                        ((ViewPager)container).addView(view, 0);
                        return new ChannelViewPair(chn, view);
                }
                
                @Override
                public void
                destroyItem(View container, int position, Object object) {
                        ChannelViewPair pair = (ChannelViewPair)object;
                        ((ViewPager)container).removeView(pair.view);
                        recycledViews.add(pair.view);
                        pair.channel.uninstallView();
                }
                
                @Override
                public void
                setPrimaryItem(View container, int position, Object object) {
                        primaryItem = (ChannelViewPair)object;
                }
                
                @Override
                public boolean
                isViewFromObject(View view, Object object) {
                        return view == ((ChannelViewPair)object).view;
                }
                
                @Override
                public Parcelable
                saveState() { return null; }
                
                @Override
                public void
                restoreState(Parcelable state, ClassLoader loader) { }
                
                @Override
                public void
                channelAdded(SamplerChannelListEvent e) { notifyDataSetChanged(); }
                
                @Override
                public void
                channelRemoved(SamplerChannelListEvent e) { notifyDataSetChanged(); }
        }
}
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.classic;
24
25	import java.util.ArrayDeque;
26
27	import org.jsampler.CC;
28	import org.jsampler.android.AHF;
29	import org.jsampler.event.SamplerChannelListEvent;
30	import org.jsampler.event.SamplerChannelListListener;
31
32	import android.app.Activity;
33	import android.os.Bundle;
34	import android.os.Parcelable;
35	import android.support.v4.view.PagerAdapter;
36	import android.support.v4.view.ViewPager;
37	import android.view.View;
38
39	public class ChannelPagerActivity extends Activity {
40	private ViewPager channelPager;
41
42	/** Called when the activity is first created. */
43	@Override
44	public void onCreate(Bundle savedInstanceState) {
45	super.onCreate(savedInstanceState);
46
47	channelPager = new ViewPager(this);
48	ChannelPagerAdapter adapter = new ChannelPagerAdapter();
49	channelPager.setAdapter(adapter);
50	CC.getSamplerModel().addSamplerChannelListListener(adapter);
51	int idx = getIntent().getExtras().getInt("org.jsampler.android.SelectedChannelID", 0);
52	channelPager.setCurrentItem(idx);
53	setContentView(channelPager);
54	}
55
56	@Override
57	protected void
58	onDestroy() {
59	ChannelPagerAdapter adapter = (ChannelPagerAdapter)channelPager.getAdapter();
60	CC.getSamplerModel().removeSamplerChannelListListener(adapter);
61	super.onDestroy();
62
63	}
64
65	private static class ChannelViewPair {
66	public Channel channel;
67	public View view;
68
69	ChannelViewPair(Channel channel, View view) {
70	this.channel = channel;
71	this.view = view;
72	}
73	}
74
75	private class ChannelPagerAdapter extends PagerAdapter implements SamplerChannelListListener {
76
77
78	private ArrayDeque<View> recycledViews = new ArrayDeque<View>();
79	private ChannelViewPair primaryItem = null;
80
81	private ChannelsPane
82	getLane() { return (ChannelsPane)AHF.getMainFrame().getSelectedChannelsPane(); }
83
84	@Override
85	public int
86	getCount() { return getLane().getChannelCount(); }
87
88	@Override
89	public void startUpdate(View container) { }
90
91	@Override
92	public void finishUpdate(View container) {
93	if(channelPager.getCurrentItem() >= getCount()) {
94	// workaround for bug in ViewPager when the
95	// current item is the last one and a previous item is removed
96	channelPager.setCurrentItem(getCount() - 1, true);
97	}
98	}
99
100	@Override
101	public int
102	getItemPosition(Object object) { return POSITION_NONE; }
103
104	@Override
105	public Object
106	instantiateItem(View container, int position) {
107	Channel chn = getLane().getChannel(position);
108	View view = recycledViews.pollLast();
109	chn.installView(view);
110	view = chn.getView();
111
112	((ViewPager)container).addView(view, 0);
113	return new ChannelViewPair(chn, view);
114	}
115
116	@Override
117	public void
118	destroyItem(View container, int position, Object object) {
119	ChannelViewPair pair = (ChannelViewPair)object;
120	((ViewPager)container).removeView(pair.view);
121	recycledViews.add(pair.view);
122	pair.channel.uninstallView();
123	}
124
125	@Override
126	public void
127	setPrimaryItem(View container, int position, Object object) {
128	primaryItem = (ChannelViewPair)object;
129	}
130
131	@Override
132	public boolean
133	isViewFromObject(View view, Object object) {
134	return view == ((ChannelViewPair)object).view;
135	}
136
137	@Override
138	public Parcelable
139	saveState() { return null; }
140
141	@Override
142	public void
143	restoreState(Parcelable state, ClassLoader loader) { }
144
145	@Override
146	public void
147	channelAdded(SamplerChannelListEvent e) { notifyDataSetChanged(); }
148
149	@Override
150	public void
151	channelRemoved(SamplerChannelListEvent e) { notifyDataSetChanged(); }
152	}
153	}