haiku-beta6/src/kits/interface/OptionControl.cpp

/*
 * Copyright 2003-2006, Haiku, Inc.
 * Distributed under the terms of the MIT license.
 *
 * Authors:
 *		Stefano Ceccherini ([email protected])
 * 		Jerome Duval
 *
 * Description:	An abstract base class for option controls.
 */

#include <OptionControl.h>

#include <cstring>


/*! \brief Creates and initializes a BOptionControl.
	\param frame The control's frame rectangle.
	\param name The control's name.
	\param label The label displayed by the control.
	\param message The message which the control will send when operated.
	\param resize Resize mask, passed to the base class's constructor.
	\param flags View flags, passed to the base class's constructor.
*/
BOptionControl::BOptionControl(BRect frame, const char *name, const char *label,
								BMessage *message, uint32 resize, uint32 flags)
	:
	BControl(frame, name, label, message, resize, flags)
{
}


/*! \brief Destructor
	It does nothing.
*/
BOptionControl::~BOptionControl()
{
}


/*! \brief Overrides the base version to take special actions.
	\param message The received message.
	Calls SetValue() if receives a B_OPTION_CONTROL_VALUE message
	which contains a "be:value" int32
*/
void
BOptionControl::MessageReceived(BMessage *message)
{
	switch (message->what) {
		case B_OPTION_CONTROL_VALUE:
		{
			int32 value;
			if (message->FindInt32("be:value", &value) == B_OK) {
				SetValue(value);
				Invoke();				
			}
			break;
		}
		default:
			BControl::MessageReceived(message);
			break;
	}
}


/*! \brief Adds an "option" after the last one.
	\param name The name of the option.
	\param value The value of the option.
	\return \c B_OK if the option was added succesfully,
		an error code otherwise.
*/
status_t
BOptionControl::AddOption(const char *name, int32 value)
{
	int32 numOptions = CountOptions();
	return AddOptionAt(name, value, numOptions);
}


/*! \brief Select the option which has the given value.
	\param value The value of the option.
	\return \c B_OK if there was an option with that value,
		and it was correctly selected, an error code otherwise.
	It works like SetValue(value);
*/
status_t
BOptionControl::SelectOptionFor(int32 value)
{
	// XXX: I wonder why this method was created in the first place,
	// since you can obtain the same result simply by calling SetValue().
	// The only difference I can see is that this method iterates over 
	// all the options contained in the control, and then selects the right one.
	int32 numOptions = CountOptions();
	for (int32 c = 0; c < numOptions; c++) {
		const char *name = NULL;
		int32 optionValue;
		if (GetOptionAt(c, &name, &optionValue) && optionValue == value) {
			SetValue(optionValue);
			return B_OK;
		}
	}

	return B_ERROR;
}


/*! \brief Select the option which has the given name.
	\param name The name of the option.
	\return \c B_OK if there was an option with that name,
		and it was correctly selected, an error code otherwise.
*/
status_t
BOptionControl::SelectOptionFor(const char *name)
{
	int32 numOptions = CountOptions();
	for (int32 c = 0; c < numOptions; c++) {
		const char *optionName = NULL;
		int32 optionValue;
		if (GetOptionAt(c, &optionName, &optionValue)
						&& !strcmp(name, optionName)) {
			SetValue(optionValue);
			return B_OK;
		}
	}
	return B_ERROR;
}


// Protected
/*! \brief Creates a BMessage which contains the given value.
	\param The value to be added to the message.
	\return A pointer to a BMessage, NULL if something went wrong.
*/
BMessage *
BOptionControl::MakeValueMessage(int32 value)
{
	BMessage *message = new BMessage(B_OPTION_CONTROL_VALUE);	
	if (message->AddInt32("be:value", value) != B_OK) {
		delete message;
		message = NULL;
	}		
	
	return message;
}


// Private unimplemented
BOptionControl::BOptionControl()
	:
	BControl(BRect(), "", "", NULL, 0, 0)
{
}


BOptionControl::BOptionControl(const BOptionControl & clone)
	:
	BControl(BRect(), "", "", NULL, 0, 0)
{
}


BOptionControl &
BOptionControl::operator=(const BOptionControl & clone)
{
	return *this;
}


// FBC
status_t BOptionControl::_Reserved_OptionControl_0(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_1(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_2(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_3(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_4(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_5(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_6(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_7(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_8(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_9(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_10(void *, ...) { return B_ERROR; }
status_t BOptionControl::_Reserved_OptionControl_11(void *, ...) { return B_ERROR; }