NvUIButton Class Reference

A class that implements a variety of standard interactive button widgets. More...

#include <NvUI.h>

Inheritance diagram for NvUIButton:

List of all members.

Public Member Functions

NvUIButton (NvUIButtonType::Enum btntype, uint32_t actionCode, NvUIElement *visrep[NvUIButtonState::MAX], const char *title=NULL, float pt=0, bool shadowed=false)

Most common constructor for a graphical, multi-state visual button.

NvUIButton (NvUIButtonType::Enum btntype, uint32_t actionCode, NvUIElement *visrep, const char *title=NULL, float pt=0, bool shadowed=false)

Button constructor for a quick, single-visual-state button.

NvUIButton (NvUIButtonType::Enum btntype, uint32_t actionCode, NvUIRect &size, const char *title, float pt, bool shadowed=false)

Button constructor for a quick, text-only button.

virtual ~NvUIButton ()

Default destructor, cleans up visrep elements and title, if any.

virtual void SetTitle (const char *title, float ptsize, bool shadowed=false)

Set the title string of the button.

virtual void SetTitleColor (const NvPackedColor &c)

Set the color of the title text.

virtual void SetHitMargin (float hitwide, float hittall)

Add extra horizontal/vertical margin to thumb hit rect to make it easier to grab.

virtual void Draw (const NvUIDrawState &drawState)

Draw the right UI element for current state, as well as optional title text.

virtual void SetOrigin (float x, float y)

Position sub-elements and optional title based on the button type.

virtual NvUIEventResponse HandleEvent (const NvGestureEvent &ev, NvUST timeUST, NvUIElement *hasFocus)

Handles tracking from press to release on the button object, and if needed posts appropriate NvUIReaction.

virtual NvUIEventResponse HandleReaction (const NvUIReaction &react)

Handles any reaction matching our action code.

virtual void LostFocus ()

We override to clear hit tracking state, and reset draw state for push buttons.

uint32_t GetActionCode ()

Accessor to get the reaction action code for this button.

void SetSubCode (uint32_t c)

Accessor to set the reaction sub-code for this button.

uint32_t GetSubCode ()

Accessor to get the reaction sub-code for this button.

void SetStickyClick (bool b)

Set whether to retain the pressed-in even if user drags outside the hit rect.

void ConsumeGesture (const NvGestureEvent &ev)

Allow us to flag that we reacted to this gesture, so we don't handle again until new gesture UID.

Protected Attributes

NvUIElement * m_visrep [NvUIButtonState::MAX]

Abstract UI element array of visual representations we proxy as our button visual.

NvUIText * m_title

UIText-drawn title for a button, if one isn't baked into the graphic rep.

NvUIButtonType::Enum m_type

The 'class' of button (which defines its 'style' of interaction): push, radio, or checkbox.

uint32_t m_action

The reaction code 'posted' by the event handler when the button is pressed and released such that state changed.

uint32_t m_subcode

A specialized reaction code used by some kinds of buttons (radio in particular) to denote which sub-item was picked by index.

NvGestureUID m_reactGestureUID

A gesture event UID of the last gesture that we triggered/reacted to, so we can quickly ignore further HandleEvent calls until the gesture UID increments.

NvGestureUID m_failedHitUID

A gesture event UID of the last gesture that failed to hit the button, so we can quickly ignore further HandleEvent calls until the gesture UID increments.

bool m_wasHit

Used by HandleEvent and internal hit-tracking.

float m_hitMarginWide

An extra 'padding' or margin added to the button's normal hit-test width, in order to allow for a larger test region than the button's visual.

float m_hitMarginTall

An extra 'padding' or margin added to the button's normal hit-test height, in order to allow for a larger test region than the button's visual.

bool m_stickyClick

Whether to retain the pressed-in state even if we drag outside bounds.

Detailed Description

A class that implements a variety of standard interactive button widgets.

This class uses abstract visual representations of the three button states, combined with the logic behind the types of interactions of the three types of buttons, and the concept in the system of a 'reaction' to interacting with a button, and wraps it all up with end-to-end event handling.

This can represent a single graphical or textual (or other) element on the screen that is clickable.

While tracking a press within the button, the HandleEvent method will attempt to keep the focus on the button, so that it will get 'first shot' at further event input in the system.

See also:

NvUIElement

NvUIReaction

NvUIEventResponse

Constructor & Destructor Documentation

NvUIButton::NvUIButton	(	NvUIButtonType::Enum	btntype,
		uint32_t	actionCode,
		NvUIElement *	visrep[NvUIButtonState::MAX],
		const char *	title = `NULL`,
		float	pt = `0`,
		bool	shadowed = `false`
	)

Most common constructor for a graphical, multi-state visual button.

This is the generally 'best' method for building a visual button, as you give it the specific visual elements built for each state (active, pressed, inactive), and thus have very precise control over the visual results of interaction. Usually the visuals are an NvUIGraphic or NvUIGraphicFrame, but they can be any UI element (including containers with complex overlaid visuals, or custom visual subclasses).

Parameters:

	btntype	The type/style of button
	actionCode	The action code we raise in an NvUIReaction when our state changes
	visrep	Array of UI elements that are our visuals for each interaction state, could have text embedded.
	title	[optional] String to display for our title
	pt	[optional] Font size to use if we supply title string
	shadowed	[optional] Whether to drop-shadow our title text

See also:: NvUIGraphic

NvUIButton::NvUIButton	(	NvUIButtonType::Enum	btntype,
		uint32_t	actionCode,
		NvUIElement *	visrep,
		const char *	title = `NULL`,
		float	pt = `0`,
		bool	shadowed = `false`
	)

Button constructor for a quick, single-visual-state button.

This button will not show different visuals while interacting, but otherwise has the ability to display any graphics/text to display as a button.

Parameters:

	btntype	The type/style of button
	actionCode	The action code we raise in an NvUIReaction when our state changes
	visrep	The UI element that is our visual representation, could have text embedded.
	title	[optional] String to display for our title
	pt	[optional] Font size to use if we supply title string
	shadowed	[optional] Whether to drop-shadow our title text

NvUIButton::NvUIButton	(	NvUIButtonType::Enum	btntype,
		uint32_t	actionCode,
		NvUIRect &	size,
		const char *	title,
		float	pt,
		bool	shadowed = `false`
	)

Button constructor for a quick, text-only button.

Parameters:

	btntype	The type/style of button
	actionCode	The action code we raise in an NvUIReaction when our state changes
	size	The UI/view space rectangle to position the button
	title	The string to display for our title
	pt	The font size to use for our title
	shadowed	[optional] Whether to drop-shadow our title text

virtual NvUIButton::~NvUIButton ( ) [virtual]

Default destructor, cleans up visrep elements and title, if any.

Member Function Documentation

void NvUIButton::ConsumeGesture ( const NvGestureEvent & ev ) [inline]

Allow us to flag that we reacted to this gesture, so we don't handle again until new gesture UID.

virtual void NvUIButton::Draw ( const NvUIDrawState & drawState ) [virtual]

Draw the right UI element for current state, as well as optional title text.

Reimplemented from NvUIElement.

Reimplemented in NvUIPopup.

uint32_t NvUIButton::GetActionCode ( ) [inline]

Accessor to get the reaction action code for this button.

uint32_t NvUIButton::GetSubCode ( ) [inline]

Accessor to get the reaction sub-code for this button.

virtual NvUIEventResponse NvUIButton::HandleEvent	(	const NvGestureEvent &	ev,
		NvUST	timeUST,
		NvUIElement *	hasFocus
	)			`[virtual]`

Handles tracking from press to release on the button object, and if needed posts appropriate NvUIReaction.

Reimplemented from NvUIElement.

Reimplemented in NvUIPopup.

virtual NvUIEventResponse NvUIButton::HandleReaction ( const NvUIReaction & react ) [virtual]

Handles any reaction matching our action code.

If the action matches our code, but the uid is zero, we assume it's a 'system message' telling us to override our state to what's in the reaction. Otherwise, if we're a radio button and receive our code, but not our uid, we assume another radio button got pressed, and we clear our state back to active.

Reimplemented from NvUIElement.

Reimplemented in NvUIPopup.

virtual void NvUIButton::LostFocus ( ) [virtual]

We override to clear hit tracking state, and reset draw state for push buttons.

Reimplemented from NvUIElement.

virtual void NvUIButton::SetHitMargin	(	float	hitwide,
		float	hittall
	)			`[virtual]`

Add extra horizontal/vertical margin to thumb hit rect to make it easier to grab.

virtual void NvUIButton::SetOrigin	(	float	x,
		float	y
	)			`[virtual]`

Position sub-elements and optional title based on the button type.

Reimplemented from NvUIElement.

Reimplemented in NvUIPopup.

void NvUIButton::SetStickyClick ( bool b ) [inline]

Set whether to retain the pressed-in even if user drags outside the hit rect.

void NvUIButton::SetSubCode ( uint32_t c ) [inline]

Accessor to set the reaction sub-code for this button.

virtual void NvUIButton::SetTitle	(	const char *	title,
		float	ptsize,
		bool	shadowed = `false`
	)			`[virtual]`

Set the title string of the button.

Is used by constructors to set up our text string, but can be used to re-set the title later on.

Parameters:

	title	The string to display for our title
	ptsize	The font size to use for our title. Note if point size is passed in as 0, a size will be selected based on the height of the element.
	shadowed	[optional] Whether to drop-shadow our title text

virtual void NvUIButton::SetTitleColor ( const NvPackedColor & c ) [virtual]

Set the color of the title text.

Member Data Documentation

uint32_t NvUIButton::m_action [protected]

The reaction code 'posted' by the event handler when the button is pressed and released such that state changed.

Radio buttons use this to both notify change up the tree AND to notify 'linked' alternate state buttons to turn themselves back 'off'.

NvGestureUID NvUIButton::m_failedHitUID [protected]

A gesture event UID of the last gesture that failed to hit the button, so we can quickly ignore further HandleEvent calls until the gesture UID increments.

float NvUIButton::m_hitMarginTall [protected]

An extra 'padding' or margin added to the button's normal hit-test height, in order to allow for a larger test region than the button's visual.

Important for touchscreen+finger interactivity.

float NvUIButton::m_hitMarginWide [protected]

An extra 'padding' or margin added to the button's normal hit-test width, in order to allow for a larger test region than the button's visual.

Important for touchscreen+finger interactivity.

NvGestureUID NvUIButton::m_reactGestureUID [protected]

A gesture event UID of the last gesture that we triggered/reacted to, so we can quickly ignore further HandleEvent calls until the gesture UID increments.

bool NvUIButton::m_stickyClick [protected]

Whether to retain the pressed-in state even if we drag outside bounds.

uint32_t NvUIButton::m_subcode [protected]

A specialized reaction code used by some kinds of buttons (radio in particular) to denote which sub-item was picked by index.

NvUIText* NvUIButton::m_title [protected]

UIText-drawn title for a button, if one isn't baked into the graphic rep.

NvUIButtonType::Enum NvUIButton::m_type [protected]

The 'class' of button (which defines its 'style' of interaction): push, radio, or checkbox.

NvUIElement* NvUIButton::m_visrep[NvUIButtonState::MAX] [protected]

Abstract UI element array of visual representations we proxy as our button visual.

Must have at least the 'active' state defined. Can be text, graphics, complex container, etc.

bool NvUIButton::m_wasHit [protected]

Used by HandleEvent and internal hit-tracking.

Set when we had a successful press/click in the thumb, so we are then tracking for drag/flick/release.

The documentation for this class was generated from the following file:

NvUI.h


Public Member Functions
	NvUIButton (NvUIButtonType::Enum btntype, uint32_t actionCode, NvUIElement visrep[NvUIButtonState::MAX], const char title=NULL, float pt=0, bool shadowed=false)
	Most common constructor for a graphical, multi-state visual button.
	NvUIButton (NvUIButtonType::Enum btntype, uint32_t actionCode, NvUIElement visrep, const char title=NULL, float pt=0, bool shadowed=false)
	Button constructor for a quick, single-visual-state button.
	NvUIButton (NvUIButtonType::Enum btntype, uint32_t actionCode, NvUIRect &size, const char *title, float pt, bool shadowed=false)
	Button constructor for a quick, text-only button.
virtual	~NvUIButton ()
	Default destructor, cleans up visrep elements and title, if any.
virtual void	SetTitle (const char *title, float ptsize, bool shadowed=false)
	Set the title string of the button.
virtual void	SetTitleColor (const NvPackedColor &c)
	Set the color of the title text.
virtual void	SetHitMargin (float hitwide, float hittall)
	Add extra horizontal/vertical margin to thumb hit rect to make it easier to grab.
virtual void	Draw (const NvUIDrawState &drawState)
	Draw the right UI element for current state, as well as optional title text.
virtual void	SetOrigin (float x, float y)
	Position sub-elements and optional title based on the button type.
virtual NvUIEventResponse	HandleEvent (const NvGestureEvent &ev, NvUST timeUST, NvUIElement *hasFocus)
	Handles tracking from press to release on the button object, and if needed posts appropriate NvUIReaction.
virtual NvUIEventResponse	HandleReaction (const NvUIReaction &react)
	Handles any reaction matching our action code.
virtual void	LostFocus ()
	We override to clear hit tracking state, and reset draw state for push buttons.
uint32_t	GetActionCode ()
	Accessor to get the reaction action code for this button.
void	SetSubCode (uint32_t c)
	Accessor to set the reaction sub-code for this button.
uint32_t	GetSubCode ()
	Accessor to get the reaction sub-code for this button.
void	SetStickyClick (bool b)
	Set whether to retain the pressed-in even if user drags outside the hit rect.
void	ConsumeGesture (const NvGestureEvent &ev)
	Allow us to flag that we reacted to this gesture, so we don't handle again until new gesture UID.
Protected Attributes
NvUIElement *	m_visrep [NvUIButtonState::MAX]
	Abstract UI element array of visual representations we proxy as our button visual.
NvUIText *	m_title
	UIText-drawn title for a button, if one isn't baked into the graphic rep.
NvUIButtonType::Enum	m_type
	The 'class' of button (which defines its 'style' of interaction): push, radio, or checkbox.
uint32_t	m_action
	The reaction code 'posted' by the event handler when the button is pressed and released such that state changed.
uint32_t	m_subcode
	A specialized reaction code used by some kinds of buttons (radio in particular) to denote which sub-item was picked by index.
NvGestureUID	m_reactGestureUID
	A gesture event UID of the last gesture that we triggered/reacted to, so we can quickly ignore further `HandleEvent` calls until the gesture UID increments.
NvGestureUID	m_failedHitUID
	A gesture event UID of the last gesture that failed to hit the button, so we can quickly ignore further `HandleEvent` calls until the gesture UID increments.
bool	m_wasHit
	Used by `HandleEvent` and internal hit-tracking.
float	m_hitMarginWide
	An extra 'padding' or margin added to the button's normal hit-test width, in order to allow for a larger test region than the button's visual.
float	m_hitMarginTall
	An extra 'padding' or margin added to the button's normal hit-test height, in order to allow for a larger test region than the button's visual.
bool	m_stickyClick
	Whether to retain the pressed-in state even if we drag outside bounds.