001: /*
002: *
003: *
004: * Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006: *
007: * This program is free software; you can redistribute it and/or
008: * modify it under the terms of the GNU General Public License version
009: * 2 only, as published by the Free Software Foundation.
010: *
011: * This program is distributed in the hope that it will be useful, but
012: * WITHOUT ANY WARRANTY; without even the implied warranty of
013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014: * General Public License version 2 for more details (a copy is
015: * included at /legal/license.txt).
016: *
017: * You should have received a copy of the GNU General Public License
018: * version 2 along with this work; if not, write to the Free Software
019: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020: * 02110-1301 USA
021: *
022: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023: * Clara, CA 95054 or visit www.sun.com if you need additional
024: * information or have any questions.
025: */
026:
027: package javax.microedition.lcdui;
028:
029: import com.sun.mmedia.MIDPVideoPainter;
030: import com.sun.mmedia.MMHelper;
031: import java.util.Vector;
032:
033: /**
034: * This is a helper class to communicate between the LCDUI canvas and
035: * the MMAPI video players.
036: */
037: final class MMHelperImpl extends MMHelper {
038:
039: private static MMHelperImpl instance = null;
040:
041: /**
042: * Single use constructor. Cannot be instantiated twice. The instance
043: * object is held by Canvas as well as MIDPVideoPainter implementation.
044: */
045: public MMHelperImpl() {
046: if (instance != null) {
047: throw new RuntimeException(
048: "Cannot instantiate MMHelperImpl twice");
049: }
050: MMHelper.setMMHelper(this );
051: instance = this ;
052: }
053:
054: /**
055: * Returns the only instance of this class.
056: * @return the instance of this class
057: */
058: static MMHelperImpl getInstance() {
059: return instance;
060: }
061:
062: /**
063: * Informs the player to draw into Graphics <code>g</code>
064: *
065: * @param video The video player which should be repainted.
066: * @param g The graphics object to pass to the video player.
067: */
068: synchronized void paintVideo(Object video, Graphics g) {
069: MIDPVideoPainter vp = (MIDPVideoPainter) video;
070: vp.paintVideo(g);
071: }
072:
073: /**
074: * Notify video renderers that canvas becomes visible.
075: * @param video The video painter which is shown.
076: */
077: synchronized void showVideo(Object video) {
078: MIDPVideoPainter vp = (MIDPVideoPainter) video;
079: vp.showVideo();
080: }
081:
082: /**
083: * Notify video renderers that canvas becomes invisible.
084: * @param video The video painter which is hidden.
085: */
086: synchronized void hideVideo(Object video) {
087: MIDPVideoPainter vp = (MIDPVideoPainter) video;
088: vp.hideVideo();
089: }
090:
091: /****************************************************************
092: * MMHelper implementation
093: ****************************************************************/
094:
095: /**
096: * Registers a video control (which implements MIDPVideoPainter) with
097: * the corresponding Canvas where the video is to show up.
098: */
099: public void registerPlayer(Canvas c, MIDPVideoPainter vp) {
100: ((CanvasLFImpl) c.canvasLF).addEmbeddedVideo(vp);
101: }
102:
103: /**
104: * Unregisters a video control so that it doesn't get paint callbacks
105: * anymore after the player is closed. This also reduces load on the
106: * Canvas repaint mechanism.
107: */
108: public synchronized void unregisterPlayer(Canvas c,
109: MIDPVideoPainter vp) {
110: ((CanvasLFImpl) c.canvasLF).removeEmbeddedVideo(vp);
111: }
112:
113: /**
114: * Get Display being used for Item painting. Platform-dependent.
115: */
116: public Display getItemDisplay(Item item) {
117: Display display = null;
118:
119: if (item.owner == null)
120: return null;
121:
122: return item.owner.getLF().lGetCurrentDisplay();
123: }
124:
125: }
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