button

struct swf_button {
	char align;
	unsigned		f_button_reserved : 2;
	if(version >= 8) {
		unsigned		f_button_blend_mode : 1;
		unsigned		f_button_filter_list : 1;
	}
	else {
		unsigned		f_button_reserved : 2;
	}
	unsigned		f_button_state_hit_test : 1;
	unsigned		f_button_state_down : 1;
	unsigned		f_button_state_over : 1;
	unsigned		f_button_state_up : 1;
	if(any f_button_state_... != 0) {
		unsigned short		f_button_id_ref;
		unsigned short		f_button_layer;
		swf_matrix		f_matrix;
		if(f_tag == DefineButton2) {
			swf_color_transform		f_color_transform;
		}
		if(f_button_filter_list) {
			unsigned char		f_filter_count;
			swf_any_filter		f_filter;
		}
		if(f_button_blend_mode) {
			unsigned char		f_blend_mode;
		}
	}
};

A button structure defines a state and a corresponding shape reference. The shape will be affected by the specified matrix whenever used.

There are many acceptable combinations. The object which is referenced is drawn when its state matches the current state of the button. If only the f_button_state_hit_test is set, then the shape is always displayed.

struct swf_gradient_record {
	if(f_tag == DefineMorphShape || f_tag == DefineMorphShape2) {
		unsigned char	f_position;
		swf_rgba	f_rgba;
		unsigned char	f_position_morph;
		swf_rgba	f_rgba_morph;
	}
	else if(f_tag == DefineShape3 || f_tag == DefineShape4) {
		unsigned char	f_position;
		swf_rgba	f_rgba;
	}
	else {
		unsigned char	f_position;
		swf_rgb		f_rgb;
	}
};

The first record position should be 0 and the last 255. The intermediate should use the corresponding value depending on their position in the gradient effect.

struct swf_definebuttoncxform {
	swf_tag			f_tag;		/* 23 */
	unsigned short		f_button_id_ref;
	swf_color_transform	f_color_transform;
};

The DefineButton does not include any means to transform the colors of the shapes it uses. This tag was thus added just so one can transform a button colors. It is wise to use the new DefineButton2 instead so the transformation can be applied on a per state basis.

The f_button_id_ref is a reference to the button to be transformed with the specified color matrix. The button should be defined first.

enum {
	DEFINE_BUTTON_SOUND_CONDITION_POINTER_LEAVE = 0,
	DEFINE_BUTTON_SOUND_CONDITION_POINTER_ENTER = 1,
	DEFINE_BUTTON_SOUND_CONDITION_POINTER_PUSH = 2,
	DEFINE_BUTTON_SOUND_CONDITION_POINTER_RELEASE_INSIDE = 3,
	DEFINE_BUTTON_SOUND_CONDITION_MAX = 4
};

struct swf_definebuttonsound {
	swf_tag			f_tag;		/* 17 */
	unsigned short		f_button_id_ref;
	swf_sound_info		f_button_sound_condition[DEFINE_BUTTON_SOUND_CONDITION_MAX];
};

The DefineButtonSound can be used to emit a sound when an event occur on the specified button. It is likely better to use sprites that you display using actions than to use this tag. You will have access to more events and conditions, plus this tag always includes four sound effect references.

The f_button_id_ref is a reference to the button given sound effects.

struct swf_definebutton {
	swf_tag			f_tag;		/* 7 */
	unsigned short		f_button_id;
	swf_button		f_buttons;
	swf_action		f_actions;
};

Mouse interactivity in the SWF format comes from the buttons. All the buttons have an identifier and can be placed in the display list like any other shape.

A buttons has different states. Some states can be entered only when the button was in a specific state before (like a button being pushed).

Buttons can be represented graphically in any manner you want. Each state can use a different edit text, shape, sprite or text to render the button.

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Making a great thing even better!

		SSWF Support

Since it's initial release in 2002, SSWF has been extremely popular. Despite never being advertised, it has been downloaded more than 77,250 times just on SourceForge.net, has been converted to work on several Unix platforms not initially ...