indexing

	description: "[

		Implements the master part in the mixer.
		
		Use this class to create the master.
		
		Note: The master need to be active, that you can play any sound
		or music on a channel. All the commands you give to the master
		get executed on all active channels.

	]"
	date: "$Date$"
	revision: "$Revision$"

class MIXER_MASTER

inherit

	MIXER_CONSTANTS
		export {NONE} all end

	EM_SHARED_AUDIO_FACTORY
		export {NONE} all end

	EM_AUDIO_CONSTANTS
		export {NONE} all end

	EM_PANEL

create

	make

feature {NONE} -- Initialization

	make is
			-- Initialize `Current'.
		do
			make_void_surface
			create active.make_with_image_positioned ("active.png", 18, 66)
			active.clicked_event.subscribe (agent active_button_clicked)
			add_widget (active)
			make_settings
			make_playback
			make_effects
			make_panning
			make_volume
		end

	make_settings is
			-- Create save and load button.
		do
			create save.make_with_image_positioned (Void, 18, 127)
			save.clicked_event.subscribe (agent save_button_clicked)
			add_widget (save)
			create load.make_with_image_positioned (Void, 18, 154)
			load.clicked_event.subscribe (agent load_button_clicked)
			add_widget (load)
		end

	make_playback is
			-- Create the playback area in the channels.
		do
			-- Create play button
			create play.make_with_image_positioned (Void, 18, 218)
			play.clicked_event.subscribe (agent play_button_clicked)
			add_widget (play)
			-- Create stop button
			create stop.make_with_image_positioned (Void, 57, 218)
			stop.clicked_event.subscribe (agent stop_button_clicked)
			add_widget (stop)
			-- Create mute button
			create mute.make_with_image_positioned ("mute.png", 18, 245)
			mute.clicked_event.subscribe (agent mute_button_clicked)
			add_widget (mute)
			-- Create reverse button
			create reverse.make_with_image_positioned ("reverse.png", 57, 245)
			reverse.clicked_event.subscribe (agent reverse_button_clicked)
			add_widget (reverse)
			-- Create fade button
			create fade.make_with_image_positioned ("fade.png", 18, 272)
			fade.clicked_event.subscribe (agent fade_button_clicked)
			add_widget (fade)
			-- Create fade_value textbox
			create fade_value.make_with_text_positioned ("", 57, 272)
			fade_value.key_down_event.subscribe (agent fade_value_changed)
			add_widget (fade_value)
			create old_fade_value.make_empty
		end

	make_effects is
			-- Create effect buttons.
		do
			-- Create echo button
			create echo.make_with_image_positioned ("echo.png", 18, 335)
			echo.clicked_event.subscribe (agent echo_button_clicked)
			add_widget (echo)
			-- Create phasing button
			create phasing.make_with_image_positioned ("phasing.png", 18, 361)
			phasing.clicked_event.subscribe (agent phasing_button_clicked)
			add_widget (phasing)
		end

	make_panning is
			-- Create the panning slider of master.
		do
			create panning.make_positioned (16, 424)
			panning.position_changed_event.subscribe (agent panning_changed)
			add_widget (panning)
			panning.disable
		end

	make_volume is
			-- Create the volume slider of master.
		do
			create volume.make_positioned (18, 500)
			volume.position_changed_event.subscribe (agent volume_changed)
			add_widget (volume)
			volume.disable
		end

feature -- Access

	echo: MIXER_BUTTON_LARGE
		-- Echo button

	phasing: MIXER_BUTTON_LARGE
		-- Phasing button

	save: MIXER_BUTTON_LARGE
		-- Save button

	load: MIXER_BUTTON_LARGE
		-- Load button

	stop: MIXER_BUTTON_MEDIUM
		-- Stop button

	play: MIXER_BUTTON_MEDIUM
		-- Play button

	mute: MIXER_BUTTON_MEDIUM
		-- Mute button

	reverse: MIXER_BUTTON_MEDIUM
		-- Reverse button

	fade: MIXER_BUTTON_MEDIUM
		-- Fade button

	fade_value: MIXER_TEXTBOX
		-- Fade value textbox

	panning: MIXER_SLIDER_PANNING
		-- Panning slider

	volume: MIXER_SLIDER_VOLUME
		-- Volume slider

	active: MIXER_BUTTON_LARGE
		-- Active button

	music_channel: MIXER_MUSIC_CHANNEL
		-- Access to music channel

	channels: ARRAY [MIXER_CHANNEL]
		-- Access to channels

	preset: MIXER_PRESET
		-- Storage place for 'save'

feature -- Setters

	set_music_channel (a_music_channel: like music_channel) is
			-- Set music channel for the master.
		require
			a_music_channel_not_void: a_music_channel /= void
		do
			music_channel := a_music_channel
		end

	set_channels (some_channels: like channels) is
			-- Set channels for the master.
		require
			some_channels_not_void: some_channels /= Void
		do
			channels := some_channels
		end

feature -- Event

	active_button_clicked is
			-- Event for active button.
			-- With a non-active master you can't change anything or play anything on a channel.
		local
			i: INTEGER
		do
			active.toggle_active
			if active.active then
				if music_channel.track /= Void then
					music_channel.track.set_volume (music_channel.volume.current_volume)
				end
				from
					i := 1
				until
					i > 6
				loop
					if channels.item (i).channel /= Void then
						channels.item (i).channel.set_volume (volume.current_volume)
					end
					i := i + 1
				end
				fade_value.set_text ("1000")
				panning.enable
				volume.enable
				create old_fade_value.make_from_string (fade_value.text)
			else
				from
					i := 1
				until
					i > 6
				loop
					if channels.item (i).channel /= Void then
						channels.item (i).channel.set_volume (0)
					end
					i := i + 1
				end
				if music_channel.track /= Void then
					music_channel.track.set_volume (0)
				end
				fade_value.set_text ("")
				if mute.active then
					mute.toggle_active
				end
				if reverse.active then
					reverse.toggle_active
				end
				if fade.active then
					fade.toggle_active
				end
				if echo.active then
					echo.toggle_active
				end
				if phasing.active then
					phasing.toggle_active
				end
				volume.set_current_value (Em_max_volume)
				panning.set_current_value (0)
				panning.disable
				volume.disable
				from
					i := 1
				until
					i > 6
				loop
					if channels.item (i).channel /= Void then
						channels.item (i).channel.set_volume (0)
					end
					i := i + 1
				end
				fade_value.set_text ("")
			end
		ensure
			active_changed: active.active = not old active.active
		end

	save_button_clicked is
			-- Event for save button.
			-- Save current settings on all channels and on the master.
		do
			if active.active then
				create preset.make_with_save (current)
			end
		end

	load_button_clicked is
			-- Event for load button.
			-- Load last saved settings of all the channels and off the master.
		do
			if active.active then
				if preset /= Void then
					preset.load
				end
			end
		end

	play_button_clicked is
			-- Event for the play button.
			-- Plays on all active channels or pause/resume them.
		local
			i: INTEGER
		do
			if active.active and music_channel.track /= Void then
				if music_channel.active.active then
					if music_channel.track.is_playing and then not music_channel.track.is_paused and then music_channel.playing_id = music_channel.listbox.selected_index then
						music_channel.track.pause
					else
						if music_channel.playing_id = music_channel.listbox.selected_index then
							music_channel.track.resume
						else
							if music_channel.listbox.selected_index = 0 then
								music_channel.listbox.set_selected_index (1)
							end
							audio_factory.create_music_from_file (music_directory + "/" + music_channel.listbox.selected_element)
							music_channel.set_track (audio_factory.last_music)
							music_channel.track.set_volume ((music_channel.volume.current_volume * (volume.current_volume / Em_max_volume)).rounded)
							if fade.active then
								music_channel.listbox.redraw
								music_channel.track.fade_in (-1, fade_value.text.to_integer)
							else
								music_channel.track.play (1)
							end
							music_channel.set_playing_id (music_channel.listbox.selected_index)
						end
					end
				end
				from
					i := 1
				until
					i > 6
				loop
					if (is_playing and channels.item (i).channel.is_playing and not channels.item (i).channel.is_paused) or (not is_playing and (not channels.item (i).channel.is_playing or channels.item (i).channel.is_paused)) then
						if channels.item (i).active.active then
							if channels.item (i).channel.is_playing and not channels.item (i).channel.is_paused then
								channels.item (i).channel.pause
							else
								if channels.item (i).channel.is_paused then
									channels.item (i).channel.resume
								else
									if channels.item (i).combobox.selected_element /= Void then
										audio_factory.create_sound_from_file (sound_directory + "/" + channels.item (i).combobox.selected_element)
										channels.item (i).set_track (audio_factory.last_sound)
										channels.item (i).track.set_volume (channels.item (i).volume.current_volume)
										channels.item (i).channel.set_volume (volume.current_volume)
										if fade.active then
											channels.item (i).channel.fade_in_timed (channels.item (i).track, -1, fade_value.text.to_integer, -1)
										else
											channels.item (i).channel.play (channels.item (i).track, -1)
										end
									end
								end
							end
						end
					end
					i := i + 1
				end
				from
				until
					not music_channel.track.is_fading_in and then
					not channels.item (1).channel.is_fading_in and then not channels.item (2).channel.is_fading_in and then
					not channels.item (3).channel.is_fading_in and then not channels.item (4).channel.is_fading_in and then
					not channels.item (5).channel.is_fading_in and then not channels.item (6).channel.is_fading_in
				loop
				end
				is_playing := not is_playing
			end
		end

	stop_button_clicked is
			-- Event for stop button.
			-- Stops all active playing channels.
		local
			i: INTEGER
		do
			if music_channel.active.active then
				if music_channel.track /= Void and then music_channel.track.is_playing then
					music_channel.set_stop_pressed (True)
					if fade.active then
						music_channel.track.fade_out (fade_value.text.to_integer)
					else
						music_channel.track.stop
					end
				end
				music_channel.set_playing_id (-1)
			end
			from
				i := 1
			until
				i > 6
			loop
				if channels.item (i).active.active then
					if channels.item (i).channel.is_playing then
						if fade.active then
							channels.item (i).channel.fade_out (fade_value.text.to_integer)
						else
							channels.item (i).channel.stop
						end
					end
				end
				i := i + 1
			end
			from
			until
				not music_channel.track.is_fading_out and then
				not channels.item (1).channel.is_fading_out and then not channels.item (2).channel.is_fading_out and then
				not channels.item (3).channel.is_fading_out and then not channels.item (4).channel.is_fading_out and then
				not channels.item (5).channel.is_fading_out and then not channels.item (6).channel.is_fading_out
			loop
			end
			is_playing := False
		end

	mute_button_clicked is
			-- Event for mute button.
			-- Mute or unmute all active channels.
		local
			i: INTEGER
		do
			if active.active then
				mute.toggle_active
				if mute.active then
					if music_channel.track /= Void then
						music_channel.track.set_volume (0)
					end
					from
						i := 1
					until
						i > 6
					loop
						channels.item (i).channel.set_volume (0)
						i := i + 1
					end
				else
					if music_channel.track /= Void and then not music_channel.mute.active then
						music_channel.track.set_volume (music_channel.volume.current_volume)
					end
					from
						i := 1
					until
						i > 6
					loop
						channels.item (i).channel.set_volume (volume.current_volume)
						i := i + 1
					end
				end
			end
		end

	reverse_button_clicked is
			-- Event for reverse button.
			-- Reverse on all active channels.
		local
			i: INTEGER
		do
			if active.active then
				reverse.toggle_active
				if reverse.active then
					from
						i := 1
					until
						i > 6
					loop
						if not channels.item (i).reverse.active then
							channels.item (i).channel.toggle_reverse_stereo
						end
						i := i + 1
					end
				else
					from
						i := 1
					until
						i > 6
					loop
						if not channels.item (i).reverse.active then
							channels.item (i).channel.toggle_reverse_stereo
						end
						i := i + 1
					end
				end
			end
		end

	fade_button_clicked is
			-- Event for fade button.
			-- If fade is activatet, the fade effect is used in play and stop with current fade_value.
		do
			if active.active then
				fade.toggle_active
			end
		end

	fade_value_changed (a_keyboard_event: EM_KEYBOARD_EVENT) is
			-- Event for fade value changed.
			-- Sets the value for the fade effect.
		do
			if active.active and then fade_value.text.is_integer then
				create old_fade_value.make_from_string (fade_value.text)
			elseif fade_value.text.is_empty then
				fade_value.set_text ("0")
			else
				fade_value.set_text (create {STRING}.make_from_string (old_fade_value))
			end
		end

	echo_button_clicked is
			-- Event for the echo button.
			-- If echo is active, an echo effect will register to all active channels.
		do
			if active.active then
				echo.toggle_active
				if echo.active then
					audio_subsystem.mixer.channels.register_postmix_effect (channels.item (1).echo_effect, default_pointer)
				else
					audio_subsystem.mixer.channels.unregister_postmix_effect (channels.item (1).echo_effect)
				end
			end
		end

	phasing_button_clicked is
			-- Event for phasing button.
			-- If phasing is active, a phasing effect will register to all active channels.
		do
			if active.active then
				phasing.toggle_active
				if phasing.active then
					audio_subsystem.mixer.channels.register_postmix_effect (channels.item (1).phasing_effect, default_pointer)
				else
					audio_subsystem.mixer.channels.unregister_postmix_effect (channels.item (1).phasing_effect)
				end
			end
		end

	panning_changed (a_panning: INTEGER) is
			-- Event if panning's changed.
			-- Updates the panning slider and the panning value.
			-- `a_panning': is the current panning value given from the subscribe event.
		require
			a_panning_is_valid: a_panning <= 255 and a_panning >= -255
		local
			i: INTEGER
		do
			panning.update_lights
			if active.active then
				from
					i := 1
				until
					i > 6
				loop
					channels.item (i).panning_changed (channels.item (i).panning.current_value)
					i := i + 1
				end
			end
		end

	volume_changed (a_volume: INTEGER) is
			-- Event if volume's changed.
			-- Updates the volume slider and the volume value.
			-- `a_volume': is the current volume value given by the subscribe event.
		require
			a_volume_is_valid: a_volume <= 255 and a_volume >= 0
		local
			i: INTEGER
		do
			volume.update_lights
			if active.active then
				if music_channel.track /= Void then
					music_channel.track.set_volume ((music_channel.volume.current_volume * (volume.current_volume / Em_max_volume)).rounded)
				end
				from
					i := 1
				until
					i > 6
				loop
					if channels.item (i).channel /= Void then
						channels.item (i).channel.set_volume (volume.current_volume)
					end
					i := i + 1
				end
			end
		end

feature {NONE} -- Internal variables

	old_fade_value: STRING
		-- Old fade value

	is_playing: BOOLEAN
			-- Is master playing?

end