com.bramosystems.oss.player.core.client

Class AbstractMediaPlayer

java.lang.Object

com.google.gwt.user.client.ui.UIObject

com.google.gwt.user.client.ui.Widget

com.google.gwt.user.client.ui.Composite

com.bramosystems.oss.player.core.client.AbstractMediaPlayer

All Implemented Interfaces:

HasMediaMessageHandlers, HasMediaProgressHandlers, HasMediaStateHandlers, HasPlayStateHandlers, com.google.gwt.event.dom.client.HasKeyDownHandlers, com.google.gwt.event.dom.client.HasKeyPressHandlers, com.google.gwt.event.dom.client.HasKeyUpHandlers, com.google.gwt.event.dom.client.HasMouseDownHandlers, com.google.gwt.event.dom.client.HasMouseMoveHandlers, com.google.gwt.event.dom.client.HasMouseUpHandlers, com.google.gwt.event.logical.shared.HasAttachHandlers, com.google.gwt.event.shared.HasHandlers, com.google.gwt.user.client.EventListener, com.google.gwt.user.client.ui.HasVisibility, com.google.gwt.user.client.ui.IsRenderable, com.google.gwt.user.client.ui.IsWidget

Direct Known Subclasses:

CustomAudioPlayer, CustomVideoPlayer, Player

public abstract class AbstractMediaPlayer
extends com.google.gwt.user.client.ui.Composite
implements HasMediaStateHandlers, com.google.gwt.event.dom.client.HasMouseMoveHandlers, com.google.gwt.event.dom.client.HasMouseDownHandlers, com.google.gwt.event.dom.client.HasMouseUpHandlers, com.google.gwt.event.dom.client.HasKeyDownHandlers, com.google.gwt.event.dom.client.HasKeyUpHandlers, com.google.gwt.event.dom.client.HasKeyPressHandlers

Abstract implementation of a media player. It implements the handling of MediaStateListeners.

Author:

Sikiru Braheem

Nested Class Summary

Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject

com.google.gwt.user.client.ui.UIObject.DebugIdImpl, com.google.gwt.user.client.ui.UIObject.DebugIdImplEnabled

Field Summary

Fields inherited from class com.google.gwt.user.client.ui.UIObject

DEBUG_ID_PREFIX

Constructor Summary

Constructors

Constructor and Description
AbstractMediaPlayer() Constructor method.

Method Summary

Methods

Modifier and Type	Method and Description
com.google.gwt.event.shared.HandlerRegistration	addDebugHandler(DebugHandler handler) Adds the specified debug handler to the player
com.google.gwt.event.shared.HandlerRegistration	addKeyDownHandler(com.google.gwt.event.dom.client.KeyDownHandler handler) Adds the key down handler to the player
com.google.gwt.event.shared.HandlerRegistration	addKeyPressHandler(com.google.gwt.event.dom.client.KeyPressHandler handler) Adds the key press handler to the player
com.google.gwt.event.shared.HandlerRegistration	addKeyUpHandler(com.google.gwt.event.dom.client.KeyUpHandler handler) Adds the key up handler to the player
com.google.gwt.event.shared.HandlerRegistration	addLoadingProgressHandler(LoadingProgressHandler handler) Adds the specified loading progress handler to the player
com.google.gwt.event.shared.HandlerRegistration	addMediaInfoHandler(MediaInfoHandler handler) Adds the specified MediaInfo handler to the player
com.google.gwt.event.shared.HandlerRegistration	addMouseDownHandler(com.google.gwt.event.dom.client.MouseDownHandler handler) Adds the mouse down handler to the player
com.google.gwt.event.shared.HandlerRegistration	addMouseMoveHandler(com.google.gwt.event.dom.client.MouseMoveHandler handler) Adds the mouse move handler to the player
com.google.gwt.event.shared.HandlerRegistration	addMouseUpHandler(com.google.gwt.event.dom.client.MouseUpHandler handler) Adds the mouse up handler to the player
com.google.gwt.event.shared.HandlerRegistration	addPlayerStateHandler(PlayerStateHandler handler) Adds the specified player-state handler to the player
com.google.gwt.event.shared.HandlerRegistration	addPlayStateHandler(PlayStateHandler handler) Adds the specified play-state handler to the player
protected void	addToPlayerReadyCommandQueue(String key, com.google.gwt.user.client.Command command) Adds the specified command to this players' command queue.
protected void	fireDebug(String message) Convenience method to fire DebugEvent's with informational messages on registered handlers.
protected void	fireError(String description) Convenience method to fire error type DebugEvent's on registered handlers.
protected void	fireLoadingProgress(double progress) Convenience method to fire LoadingProgressEvent's on registered handlers.
protected void	fireMediaInfoAvailable(MediaInfo info) Convenience method to fire MediaInfoEvent's on registered handlers.
protected void	firePlayerStateEvent(PlayerStateEvent.State state) Convenience method to fire PlayerStateEvent's on registered handlers.
protected void	firePlayStateEvent(PlayStateEvent.State state, int itemIndex) Convenience method to fire PlayStateEvent's on registered handlers.
int	getLoopCount() Returns the number of times this player repeats playback before stopping.
abstract long	getMediaDuration() Returns the duration of the loaded media in milliseconds.
abstract double	getPlayPosition() Gets the current position in the media that is being played.
double	getRate() Returns the current playback rate
RepeatMode	getRepeatMode() Returns the current playback repeat mode
int	getVideoHeight() Returns the height of the current media
int	getVideoWidth() Returns the width of the current media
abstract double	getVolume() Gets the volume ranging from 0 (silent) to 1 (full volume).
protected PlayerProviderFactory	getWidgetFactory(String providerName) Returns a reference to the PlayerProviderFactory implementation with the specified providerName
boolean	isControllerVisible() Checks whether the player controls are visible.
protected static boolean	isPlayerOnPage(String playerId) Checks if the player plugin with the specified playerId is attached to the browsers' DOM
boolean	isResizeToVideoSize() Checks if player is set to adjust its size to match the dimensions of a video.
abstract void	loadMedia(String mediaURL) Loads the media at the specified URL into the player.
abstract void	pauseMedia() Pause the media playback
abstract void	playMedia() Plays the media loaded into the player.
protected void	removeFromPlayerReadyCommandQueue(String key) Removes a queued command with the specified key from this players' command queue.
<C extends ConfigParameter> void	setConfigParameter(C param, Object value) Sets the specified player parameter to the specified value IF AND ONLY IF the parameter is applicable on the player
void	setControllerVisible(boolean show) Displays or hides the player controls.
void	setLoopCount(int loop) Sets the number of times the current media file should repeat playback before stopping.
abstract void	setPlayPosition(double position) Sets the playback position of the current media
void	setRate(double rate) Sets the playback rate.
void	setRepeatMode(RepeatMode mode) Puts the player in the specified repeat mode.
void	setResizeToVideoSize(boolean resize) If the current media is a video, sets the player to adjust its size to match the dimensions of the video
abstract void	setVolume(double volume) Sets the volume.
abstract void	stopMedia() Stops the media playback.

Methods inherited from class com.google.gwt.user.client.ui.Composite

claimElement, getWidget, initializeClaimedElement, initWidget, isAttached, onAttach, onBrowserEvent, onDetach, render, render, resolvePotentialElement, setWidget

Methods inherited from class com.google.gwt.user.client.ui.Widget

addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, fireEvent, getHandlerCount, getLayoutData, getParent, isOrWasAttached, onLoad, onUnload, removeFromParent, setLayoutData, sinkEvents

Methods inherited from class com.google.gwt.user.client.ui.UIObject

addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toString, unsinkEvents

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.google.gwt.event.shared.HasHandlers

fireEvent

Constructor Detail

AbstractMediaPlayer

public AbstractMediaPlayer()

Constructor method.

Method Detail

loadMedia

public abstract void loadMedia(String mediaURL)
                        throws LoadException

Loads the media at the specified URL into the player.

In respect of the same domain policy of some plugins, the URL should point to a destination on the same domain where the application is hosted.

Parameters:

mediaURL - the URL of the media to load into the player.

Throws:

LoadException - if an error occurs while loading the media

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

playMedia

public abstract void playMedia()
                        throws PlayException

Plays the media loaded into the player.

Throws:

PlayException - if an error occurs during media playback.

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

stopMedia

public abstract void stopMedia()

Stops the media playback.

Throws:

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

pauseMedia

public abstract void pauseMedia()

Pause the media playback

Throws:

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

getMediaDuration

public abstract long getMediaDuration()

Returns the duration of the loaded media in milliseconds. An IllegalStateException is thrown is the player is not available

Returns:

the duration of the loaded media in milliseconds.

Throws:

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

getPlayPosition

public abstract double getPlayPosition()

Gets the current position in the media that is being played.

Returns:

the current position of the media being played.

Throws:

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

setPlayPosition

public abstract void setPlayPosition(double position)

Sets the playback position of the current media

Parameters:

position - the new position from where to start playback

Throws:

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

getVolume

public abstract double getVolume()

Gets the volume ranging from 0 (silent) to 1 (full volume).

Returns:

volume.

Throws:

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

setVolume

public abstract void setVolume(double volume)

Sets the volume.

Parameters:

volume - 0 (silent) to 1 (full volume).

Throws:

IllegalStateException - if the player is not available, this is the case if the player is not attached to the DOM.

firePlayStateEvent

protected final void firePlayStateEvent(PlayStateEvent.State state,
                      int itemIndex)

Convenience method to fire PlayStateEvent's on registered handlers.

Parameters:

state - the state of the player

See Also:

PlayStateEvent

firePlayerStateEvent

protected final void firePlayerStateEvent(PlayerStateEvent.State state)

Convenience method to fire PlayerStateEvent's on registered handlers.

Parameters:

state - the state of the player

See Also:

PlayerStateEvent

fireError

protected final void fireError(String description)

Convenience method to fire error type DebugEvent's on registered handlers.

Parameters:

description - the description of the error

See Also:

DebugEvent

fireDebug

protected final void fireDebug(String message)

Convenience method to fire DebugEvent's with informational messages on registered handlers.

Parameters:

message - the message

See Also:

DebugEvent

fireLoadingProgress

protected final void fireLoadingProgress(double progress)

Convenience method to fire LoadingProgressEvent's on registered handlers.

Parameters:

progress - the progress of the loading operation

See Also:

LoadingProgressEvent

fireMediaInfoAvailable

protected final void fireMediaInfoAvailable(MediaInfo info)

Convenience method to fire MediaInfoEvent's on registered handlers.

Parameters:

info - the metadata of the loaded media

See Also:

MediaInfoEvent

setControllerVisible

public void setControllerVisible(boolean show)

Displays or hides the player controls. This implementation does nothing. Subclasses that permit showing/hiding of controls should override this method and implement accordingly.

Parameters:

show - true to make the player controls visible, false otherwise.

Since:

0.6

isControllerVisible

public boolean isControllerVisible()

Checks whether the player controls are visible. This implementation return true. Subclasses that permit showing/hiding of controls should override this method and implement accordingly.

Returns:

true if player controls are visible, false otherwise.

Since:

0.6

setLoopCount

public void setLoopCount(int loop)

Sets the number of times the current media file should repeat playback before stopping. This implementation does nothing, subclasses should override and implement accordingly.

NB: As of version 1.2, the behaviour of this property depends on the setRepeatMode(RepeatMode) property

Parameters:

loop - number of times to repeat playback. A negative value makes playback repeat forever!.

Since:

0.6

getLoopCount

public int getLoopCount()

Returns the number of times this player repeats playback before stopping. This implementation returns 0, subclasses should override and implement accordingly.

Returns:

the number of times this player will repeat playback before stopping.

Since:

0.6

addToPlayerReadyCommandQueue

protected final void addToPlayerReadyCommandQueue(String key,
                                com.google.gwt.user.client.Command command)

Adds the specified command to this players' command queue. The command queue is a hash-map of commands that are schedule for execution as soon as the underlying plugin is ready for javascript interaction.

The execution of the commands is tied to the Ready state of the PlayerState event of the underlying plugin. All scheduled commands are executed exactly once.

Note: If multiple commands use the same key, only the last command is executed.

Parameters:

key - key with which the specified command is to be associated

command - the command to execute when the player plugin is ready for interaction

Since:

1.0

removeFromPlayerReadyCommandQueue

protected final void removeFromPlayerReadyCommandQueue(String key)

Removes a queued command with the specified key from this players' command queue.

Parameters:

key - key whose command is to be removed

Since:

1.0

See Also:

addToPlayerReadyCommandQueue(java.lang.String, com.google.gwt.user.client.Command)

addLoadingProgressHandler

public final com.google.gwt.event.shared.HandlerRegistration addLoadingProgressHandler(LoadingProgressHandler handler)

Adds the specified loading progress handler to the player

Specified by:

addLoadingProgressHandler in interface HasMediaProgressHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.0

See Also:

LoadingProgressHandler

addMediaInfoHandler

public final com.google.gwt.event.shared.HandlerRegistration addMediaInfoHandler(MediaInfoHandler handler)

Adds the specified MediaInfo handler to the player

Specified by:

addMediaInfoHandler in interface HasMediaMessageHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.0

See Also:

MediaInfoHandler

addPlayStateHandler

public final com.google.gwt.event.shared.HandlerRegistration addPlayStateHandler(PlayStateHandler handler)

Adds the specified play-state handler to the player

Specified by:

addPlayStateHandler in interface HasPlayStateHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.0

See Also:

PlayStateHandler

addPlayerStateHandler

public final com.google.gwt.event.shared.HandlerRegistration addPlayerStateHandler(PlayerStateHandler handler)

Adds the specified player-state handler to the player

Specified by:

addPlayerStateHandler in interface HasPlayStateHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.0

See Also:

PlayerStateHandler

addDebugHandler

public final com.google.gwt.event.shared.HandlerRegistration addDebugHandler(DebugHandler handler)

Adds the specified debug handler to the player

Specified by:

addDebugHandler in interface HasMediaMessageHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.0

See Also:

DebugHandler

setResizeToVideoSize

public void setResizeToVideoSize(boolean resize)

If the current media is a video, sets the player to adjust its size to match the dimensions of the video

Parameters:

resize - true if player should adjust its size, false otherwise

Since:

1.0

isResizeToVideoSize

public boolean isResizeToVideoSize()

Checks if player is set to adjust its size to match the dimensions of a video.

Returns:

true if player adjusts its size, false otherwise

Since:

1.0

getVideoHeight

public int getVideoHeight()

Returns the height of the current media

Returns:

the height in pixels

Since:

1.0

getVideoWidth

public int getVideoWidth()

Returns the width of the current media

Returns:

the width in pixels

Since:

1.0

isPlayerOnPage

protected static final boolean isPlayerOnPage(String playerId)

Checks if the player plugin with the specified playerId is attached to the browsers' DOM

This method is provided for the convenience of player implementation classes.

Parameters:

playerId - the object ID of the player plugin

Returns:

true if player plugin is attached, false otherwise.

Since:

1.0

setConfigParameter

public <C extends ConfigParameter> void setConfigParameter(C param,
                                                  Object value)

Sets the specified player parameter to the specified value IF AND ONLY IF the parameter is applicable on the player

Note: The parameter-value pairs are applied as HTML param tags on the underlying player plugin, therefore this method should be called before adding this player to a panel otherwise the method call will have no effect.

Overriding in a subclass

This method should be called first by any subclass that overrides it. This implementation checks if the specified value is a valid type for the specified parameter.

Type Parameters:

C - the paramter value type

Parameters:

param - the configuration parameter

value - the parameter value

Throws:

IllegalArgumentException - if value is not of the required type

Since:

2.0

setRate

public void setRate(double rate)

Sets the playback rate.

If this player is not available on the panel, this method call is added to the command-queue for later execution.

Parameters:

rate - the playback rate. A rate of 1 implies normal playback rate, fractional values are slow motion, and values greater than one are fast-forward

Since:

1.1

getRate

public double getRate()

Returns the current playback rate

Returns:

the playback rate

Since:

1.1

See Also:

setRate(double)

addMouseMoveHandler

public com.google.gwt.event.shared.HandlerRegistration addMouseMoveHandler(com.google.gwt.event.dom.client.MouseMoveHandler handler)

Adds the mouse move handler to the player

Specified by:

addMouseMoveHandler in interface com.google.gwt.event.dom.client.HasMouseMoveHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.1

addMouseDownHandler

public com.google.gwt.event.shared.HandlerRegistration addMouseDownHandler(com.google.gwt.event.dom.client.MouseDownHandler handler)

Adds the mouse down handler to the player

Specified by:

addMouseDownHandler in interface com.google.gwt.event.dom.client.HasMouseDownHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.1

addMouseUpHandler

public com.google.gwt.event.shared.HandlerRegistration addMouseUpHandler(com.google.gwt.event.dom.client.MouseUpHandler handler)

Adds the mouse up handler to the player

Specified by:

addMouseUpHandler in interface com.google.gwt.event.dom.client.HasMouseUpHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.1

addKeyDownHandler

public com.google.gwt.event.shared.HandlerRegistration addKeyDownHandler(com.google.gwt.event.dom.client.KeyDownHandler handler)

Adds the key down handler to the player

Specified by:

addKeyDownHandler in interface com.google.gwt.event.dom.client.HasKeyDownHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.1

addKeyUpHandler

public com.google.gwt.event.shared.HandlerRegistration addKeyUpHandler(com.google.gwt.event.dom.client.KeyUpHandler handler)

Adds the key up handler to the player

Specified by:

addKeyUpHandler in interface com.google.gwt.event.dom.client.HasKeyUpHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.1

addKeyPressHandler

public com.google.gwt.event.shared.HandlerRegistration addKeyPressHandler(com.google.gwt.event.dom.client.KeyPressHandler handler)

Adds the key press handler to the player

Specified by:

addKeyPressHandler in interface com.google.gwt.event.dom.client.HasKeyPressHandlers

Parameters:

handler - the handler

Returns:

the HandlerRegistration used to remove the handler

Since:

1.1

setRepeatMode

public void setRepeatMode(RepeatMode mode)

Puts the player in the specified repeat mode.

The effect of the specified mode depends on the setLoopCount(int) property as shown in the table:

Value of loopCount	Value of repeatMode	What it means?
Any value < 0	Sets repeatMode to RepeatMode.REPEAT_ALL	Playlist is repeated continously
1	RepeatMode.REPEAT_OFF	Entire playlist is played only once
	RepeatMode.REPEAT_ONE	The current playlist entry is repeated continously
	RepeatMode.REPEAT_ALL	Entire playlist is repeated continously
Any value > 1	RepeatMode.REPEAT_OFF	The loopCount property is ignored, and the entire playlist is played only once
	RepeatMode.REPEAT_ONE	Player repeats each playlist entry for the number of times specified by loopCount and moves on the next until all entries are played and stops
	RepeatMode.REPEAT_ALL	Player repeats entire playlist for the number of times specified by loopCount and stops

Parameters:

mode - the new repeat mode

Since:

1.2

See Also:

RepeatMode

getRepeatMode

public RepeatMode getRepeatMode()

Returns the current playback repeat mode

Returns:

repeat mode

Since:

1.2

See Also:

RepeatMode

getWidgetFactory

protected final PlayerProviderFactory getWidgetFactory(String providerName)

Returns a reference to the PlayerProviderFactory implementation with the specified providerName

This method is provided for the convenience of player implementation classes.

Parameters:

providerName - the provider name

Returns:

PlayerProviderFactory implementation with the specified providerName or null if no such provider exists.

Since:

1.3