Java tutorial
/* * 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.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import org.jsampler.CC; import org.jsampler.HF; import org.jsampler.JSPrefs; import org.jsampler.Server; import org.jsampler.android.AHF; import org.jsampler.android.JSamplerActivity; import org.jsampler.android.R; import org.jsampler.android.view.AndroidChannelsPane; import org.jsampler.android.view.AndroidMainFrame; import org.jsampler.event.SamplerAdapter; import org.jsampler.event.SamplerEvent; import android.content.Context; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.util.Log; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.widget.ImageButton; import android.widget.SeekBar; import android.widget.TextView; import android.widget.ViewFlipper; import static org.jsampler.JSPrefs.MAXIMUM_MASTER_VOLUME; import static org.jsampler.JSPrefs.VOL_MEASUREMENT_UNIT_DECIBEL; import static org.jsampler.android.view.AndroidI18n.i18n; import static org.jsampler.android.view.classic.ClassicPrefs.preferences; import static org.jsampler.android.JSamplerActivity.*; public class MainFrame extends AndroidMainFrame<AndroidChannelsPane> { private static final int FLING_MIN_DISTANCE = 100; private View view = null; private ViewFlipper panesFlipper; private ViewPager lanesPager; public MainFrame() { } @Override public void onCreate() { LayoutInflater inflater = (LayoutInflater) AHF.getActivity() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflater.inflate(R.layout.classic_main, null); ChannelLanesPagerAdapter lanesPagerAdapter = new ChannelLanesPagerAdapter(); lanesPager = (ViewPager) view.findViewById(R.id.main_channel_lane_pager); lanesPager.setAdapter(lanesPagerAdapter); panesFlipper = (ViewFlipper) view.findViewById(R.id.main_flipper); panesFlipper.setDisplayedChild(1); updateMainTitle(); installListeners(); updateVolume(); ChannelsPane cp = new ChannelsPane(); cp.setTitle("Channel Lane 1"); addChannelsPane(cp); addChannelsPane(new ChannelsPane("Channel Lane 2")); setSelectedChannelsPane(cp); } public void uninstall() { uninstallListeners(); } @Override public View getView() { return view; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { /*ViewFlipper flipper = getFlipper(); if(Math.abs(e1.getX() - e2.getX()) > Math.abs(e1.getY() - e2.getY())) { if(Math.abs(e1.getX() - e2.getX()) < FLING_MIN_DISTANCE) return false; if(e1.getX() - e2.getX() > 0) { // right to left flipper.setInAnimation(AHF.inFromRightAnimation()); flipper.setOutAnimation(AHF.outToLeftAnimation()); flipper.showNext(); } else { // left to right flipper.setInAnimation(AHF.inFromLeftAnimation()); flipper.setOutAnimation(AHF.outToRightAnimation()); flipper.showPrevious(); } return true; } else { if(e1.getY() - e2.getY() > 0) { // up } else { // down } }*/ return false; } public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return false; } @Override public void setVisible(boolean b) { } private void installListeners() { SeekBar sliderVolume = (SeekBar) view.findViewById(R.id.main_slider_volume); int i = CC.preferences().getIntProperty(MAXIMUM_MASTER_VOLUME); sliderVolume.setMax(i); CC.preferences().addPropertyChangeListener(MAXIMUM_MASTER_VOLUME, getHandler()); sliderVolume.setOnSeekBarChangeListener(getHandler()); CC.getSamplerModel().addSamplerListener(getHandler()); CC.preferences().addPropertyChangeListener(VOL_MEASUREMENT_UNIT_DECIBEL, getHandler()); ImageButton btn = (ImageButton) view.findViewById(R.id.classic_main_flip_back); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { panesFlipper.setInAnimation(AHF.inFromLeftAnimation()); panesFlipper.setOutAnimation(AHF.outToRightAnimation()); panesFlipper.showPrevious(); updateMainTitle(); } }); btn = (ImageButton) view.findViewById(R.id.classic_main_flip_forward); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { panesFlipper.setInAnimation(AHF.inFromRightAnimation()); panesFlipper.setOutAnimation(AHF.outToLeftAnimation()); panesFlipper.showNext(); updateMainTitle(); } }); } private void uninstallListeners() { CC.preferences().removePropertyChangeListener(MAXIMUM_MASTER_VOLUME, getHandler()); CC.getSamplerModel().removeSamplerListener(getHandler()); CC.preferences().removePropertyChangeListener(VOL_MEASUREMENT_UNIT_DECIBEL, getHandler()); ImageButton btn = (ImageButton) view.findViewById(R.id.classic_main_flip_back); btn.setOnClickListener(null); btn = (ImageButton) view.findViewById(R.id.classic_main_flip_forward); btn.setOnClickListener(null); SeekBar sliderVolume = (SeekBar) view.findViewById(R.id.main_slider_volume); sliderVolume.setOnSeekBarChangeListener(null); } private void updateMainTitle() { TextView text = (TextView) view.findViewById(R.id.main_title); switch (panesFlipper.getDisplayedChild()) { case 0: text.setText(i18n.getLabel("MainFrame.titleMidiDevices")); break; case 1: text.setText(i18n.getLabel("MainFrame.titleSamplerChannels")); break; case 2: text.setText(i18n.getLabel("MainFrame.titleAudioDevices")); break; default: text.setText(""); } } private void updateVolume() { SeekBar sliderVolume = (SeekBar) view.findViewById(R.id.main_slider_volume); sliderVolume.setProgress((int) (CC.getSamplerModel().getVolume() * 100)); } private void setVolume(boolean isAdjusting) { SeekBar sliderVolume = (SeekBar) view.findViewById(R.id.main_slider_volume); TextView tvVolume = (TextView) view.findViewById(R.id.main_text_volume); int volume = sliderVolume.getProgress(); tvVolume.setText(HF.getVolumeString(volume)); if (isAdjusting) return; int vol = (int) (CC.getSamplerModel().getVolume() * 100); if (vol == sliderVolume.getProgress()) return; /* * If the model's volume is not equal to the slider * value we assume that the change is due to user input. * So we must update the volume at the backend too. */ float v = sliderVolume.getProgress(); v /= 100; CC.getSamplerModel().setBackendVolume(v); } EventHandler handler = new EventHandler(); private EventHandler getHandler() { return handler; } private class EventHandler extends SamplerAdapter implements SeekBar.OnSeekBarChangeListener, PropertyChangeListener { @Override public void volumeChanged(SamplerEvent e) { updateVolume(); } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { setVolume(true); } @Override public void onStopTrackingTouch(SeekBar seekBar) { setVolume(false); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void propertyChange(PropertyChangeEvent e) { if (VOL_MEASUREMENT_UNIT_DECIBEL.equals(e.getPropertyName())) { setVolume(true); } else if (MAXIMUM_MASTER_VOLUME.equals(e.getPropertyName())) { int j = CC.preferences().getIntProperty(MAXIMUM_MASTER_VOLUME); SeekBar sliderVolume = (SeekBar) view.findViewById(R.id.main_slider_volume); sliderVolume.setMax(j); } } } /** * Gets the channels' pane that is currently shown, * or has the focus if more than one channels' panes are shown. * If the GUI implementation has only one pane containing sampler channels, * than this method should always return that pane (the channels' pane * with index 0). * @return The selected channels' pane. */ @Override public AndroidChannelsPane getSelectedChannelsPane() { return getChannelsPane(lanesPager.getCurrentItem()); } /** * Sets the channels' pane to be selected. * Note that all registered listeners should be notified * when the selection is changed. * @param pane The channels' pane to be shown. * @see #fireChannelsPaneSelectionChanged */ @Override public void setSelectedChannelsPane(AndroidChannelsPane pane) { int idx = getChannelsPaneIndex(pane); if (idx == -1) { Log.w("setSelectedChannelsPane", "Channel lane not found!"); return; } lanesPager.setCurrentItem(idx, true); } /** * Inserts the specified channels' pane at the specified position * in the view and in the channels' pane list. * Where and how this pane will be shown depends on the view/GUI implementation. * Note that some GUI implementation may have only one pane containing sampler channels. * @param pane The channels' pane to be inserted. * @param idx Specifies the position of the channels' pane. * @see #getChannelsPaneList */ @Override public void insertChannelsPane(AndroidChannelsPane pane, int idx) { chnPaneList.insertElementAt(pane, idx); lanesPager.getAdapter().notifyDataSetChanged(); lanesPager.setCurrentItem(idx, true); /*ViewFlipper flipper = getFlipper(); if(idx < 0 || flipper.getChildCount() < idx) { Log.w("classic.MainFrame.insertChannelsPane", "Incorrect lane position: " + idx); flipper.addView(pane.getView()); } else { flipper.addView(pane.getView(), idx); } flipper.setDisplayedChild(idx);*/ firePropertyChange("channelLaneAdded", null, pane); } /** * Invoked on startup when no JSampler home directory is specified * or the specified JSampler home directory doesn't exist. * This method should ask the user to specify a JSampler * home directory and then set the specified JSampler home directory using * {@link org.jsampler.CC#setJSamplerHome} method. * @see org.jsampler.CC#getJSamplerHome * @see org.jsampler.CC#setJSamplerHome */ @Override public void installJSamplerHome() { AHF.getActivity().showDialog(JSamplerActivity.DLG_CHOOSE_HOME_DIR); } /** Shows a detailed error information about the specified exception. */ @Override public void showDetailedErrorMessage(String err, String details) { } @Override public void handleConnectionFailure() { } /** * Gets the server address to which to connect. If the server should be * manually selected, a dialog asking the user to choose a server is displayed. * @param manualSelect Determines whether the server should be manually selected. */ @Override public void getServer(final CC.Run<Server> r, boolean manualSelect) { if (!manualSelect) { int i = preferences().getIntProperty(JSPrefs.SERVER_INDEX); int size = CC.getServerList().getServerCount(); if (size == 0) r.run(null); else if (i >= size) r.run(CC.getServerList().getServer(0)); else r.run(CC.getServerList().getServer(i)); return; } AHF.getActivity().startLocalActivity(new Requestor<Server>(CHOOSE_BACKEND_REQUEST) { public void onResult(Server res) { r.run(res); } }); } /** * Sends the specified script to the backend. * @param script The file name of the script to run. */ @Override public void runScript(String script) { } private class ChannelLanesPagerAdapter extends PagerAdapter { public int getCount() { return getChannelsPaneCount(); } public void startUpdate(View container) { } public void finishUpdate(View container) { } public Object instantiateItem(View container, int position) { View view = getChannelsPane(position).getView(); ((ViewPager) container).addView(view, 0); return view; } public void destroyItem(View container, int position, Object object) { ((ViewPager) container).removeView((View) object); } public void setPrimaryItem(View container, int position, Object object) { setSelectedChannelsPane(getChannelsPane(position)); } public boolean isViewFromObject(View view, Object object) { return view == object; } public Parcelable saveState() { return null; } public void restoreState(Parcelable state, ClassLoader loader) { } } }