haiku/src/apps/soundrecorder/TransportButton.h

/*
 * Copyright 2005, Jérôme Duval. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Inspired by SoundCapture from Be newsletter (Media Kit Basics: Consumers and Producers)
 */
 
#ifndef __MEDIA_BUTTON__
#define __MEDIA_BUTTON__

#include <Control.h>
#include <MessageRunner.h>
#include "icon_button.h"

class BMessage;
class BBitmap;
class PeriodicMessageSender;
class BitmapStash;

// TransportButton must be installed into a window with B_ASYNCHRONOUS_CONTROLS on
// currently no button focus drawing

class TransportButton : public BControl {
public:

	TransportButton(BRect frame, const char *name,
		const unsigned char *normalBits,
		const unsigned char *pressedBits,
		const unsigned char *disabledBits,
		BMessage *invokeMessage,			// done pressing over button
		BMessage *startPressingMessage = 0, // just clicked button
		BMessage *pressingMessage = 0, 		// periodical still pressing
		BMessage *donePressing = 0, 		// tracked out of button/didn't invoke
		bigtime_t period = 0,				// pressing message period
		uint32 key = 0,						// optional shortcut key
		uint32 modifiers = 0,				// optional shortcut key modifier
		uint32 resizeFlags = B_FOLLOW_LEFT | B_FOLLOW_TOP);
	
	virtual ~TransportButton();

	void SetStartPressingMessage(BMessage *);
	void SetPressingMessage(BMessage *);
	void SetDonePressingMessage(BMessage *);
	void SetPressingPeriod(bigtime_t);

	virtual void SetEnabled(bool);

protected:		

	enum {
		kDisabledMask = 0x1,
		kPressedMask = 0x2
	};
	
	virtual void AttachedToWindow();
	virtual void DetachedFromWindow();
	virtual void Draw(BRect);
	virtual void MouseDown(BPoint);
	virtual	void MouseMoved(BPoint, uint32 code, const BMessage *);
	virtual	void MouseUp(BPoint);
	virtual	void WindowActivated(bool);

	virtual BBitmap *MakeBitmap(uint32);
		// lazy bitmap builder
	
	virtual uint32 ModeMask() const;
		// mode mask corresponding to the current button state
		// - determines which bitmap will be used
	virtual const unsigned char *BitsForMask(uint32) const;
		// pick the right bits based on a mode mask

		// overriding class can add swapping between two pairs of bitmaps, etc.
	virtual void StartPressing();
	virtual void MouseCancelPressing();
	virtual void DonePressing();

private:
	void ShortcutKeyDown();
	void ShortcutKeyUp();
	
	void MouseStartPressing();
	void MouseDonePressing();

	BitmapStash *bitmaps;
		// using BitmapStash * here instead of a direct member so that the class can be private in
		// the .cpp file

	// bitmap bits used to build bitmaps for the different states
	const unsigned char *normalBits;
	const unsigned char *pressedBits;
	const unsigned char *disabledBits;
	
	BMessage *startPressingMessage;
	BMessage *pressingMessage;
	BMessage *donePressingMessage;
	bigtime_t pressingPeriod;
	
	bool mouseDown;
	bool keyDown;
	PeriodicMessageSender *messageSender;
	BMessageFilter *keyPressFilter;

	typedef BControl _inherited;
	
	friend class SkipButtonKeypressFilter;
	friend class BitmapStash;
};

class PlayPauseButton : public TransportButton {
// Knows about playing and paused states, blinks
// the pause LED during paused state
public:
	PlayPauseButton(BRect frame, const char *name,
		BMessage *invokeMessage,			// done pressing over button
		BMessage *blinkMessage = 0, 		// blinking
		uint32 key = 0,						// optional shortcut key
		uint32 modifiers = 0,				// optional shortcut key modifier
		uint32 resizeFlags = B_FOLLOW_LEFT | B_FOLLOW_TOP);
	
	// These need get called periodically to update the button state
	// OK to call them over and over - once the state is correct, the call
	// is very low overhead
	void SetStopped();
	void SetPlaying();
	void SetPaused();

protected:
	
	virtual uint32 ModeMask() const;
	virtual const unsigned char *BitsForMask(uint32) const;

	virtual void StartPressing();
	virtual void MouseCancelPressing();
	virtual void DonePressing();

private:
	enum PlayState {
		kStopped,
		kAboutToPlay,
		kPlayingLedOn,
		kPlayingLedOff,
		kAboutToPause,
		kPausedLedOn,
		kPausedLedOff
	};
	
	enum {
		kPlayingMask = 0x4,
		kPausedMask = 0x8
	};
	
	PlayState fState;
	uint32 fLastModeMask;
	BMessageRunner *fRunner;
	BMessage *fBlinkMessage;
	
	typedef TransportButton _inherited;
};


class RecordButton : public TransportButton {
// Knows about recording states, blinks
// the recording LED during recording state
public:
	RecordButton(BRect frame, const char *name,
		BMessage *invokeMessage,			// done pressing over button
		BMessage *blinkMessage = 0, 		// blinking
		uint32 key = 0,						// optional shortcut key
		uint32 modifiers = 0,				// optional shortcut key modifier
		uint32 resizeFlags = B_FOLLOW_LEFT | B_FOLLOW_TOP);
	
	// These need get called periodically to update the button state
	// OK to call them over and over - once the state is correct, the call
	// is very low overhead
	void SetStopped();
	void SetRecording();
	
protected:
	
	virtual uint32 ModeMask() const;
	virtual const unsigned char *BitsForMask(uint32) const;

	virtual void StartPressing();
	virtual void MouseCancelPressing();
	virtual void DonePressing();

private:
	enum RecordState {
		kAboutToStop,
		kStopped,
		kAboutToRecord,
		kRecordingLedOn,
		kRecordingLedOff
	};
	
	enum {
		kRecordingMask = 0x4
	};
	
	enum {
		RECORD_PRESSING = 'crpr'
	};
	
	RecordState fState;
	uint32 fLastModeMask;
	BMessageRunner *fRunner;
	BMessage *fBlinkMessage;
	
	typedef TransportButton _inherited;
};

#endif