ClipDelegate Class Reference

#include "stage/timeline/clip-widget.hpp"

Description

Todo:

WIP-WIP as of 2/2021

Definition at line 155 of file clip-widget.hpp.

Public Types
enum	Appearance {   PENDING,   SYMBOLIC,   DEGRADED,   ABRIDGED,   COMPACT,   EXPANDED }
	desired appearance style for the clip

Public Member Functions
virtual	~ClipDelegate ()
	this is an interface
virtual TimeVar &	accessDuration ()=0
virtual TimeVar &	accessStartTime ()=0
virtual uint	calcRequiredHeight () const =0
virtual Appearance	changeAppearance (Appearance desired)=0
	alter appearance style, to the degree possible for this delegate. More...
virtual Appearance	currentAppearance () const =0
	presentation mode and style currently employed
WidgetHook::Pos	establishHookPoint (WidgetHook *newView)
	(re)establish current canvas attachment coordinates, thereby possibly switching to a new canvas implementation More...
virtual WidgetHook &	getCanvas () const =0
virtual cuString	getClipName () const =0
	human readable rendering of the clip's name or identity
virtual uint	getVerticalOffset () const =0
virtual void	setClipName (cuString &)=0
virtual void	updatePosition ()=0

Static Public Member Functions
static Gtk::Widget &	expect_and_expose_Widget (PDelegate &manager)
	Wrapper to safely expose the actual clip implementation widget. More...
static Appearance	selectAppearance (PDelegate &existing, Appearance desired=PENDING, WidgetHook *newView=nullptr, optional< TimeSpan > const &timing=nullopt)
	request to change the clip delegate's appearance style, if possible. More...

Static Public Attributes
static const string	defaultName {_("clip")}
	placeholder name – typically overridden from the model
static const int	defaultOffsetY {0}
	vertical offset below the track start

Private Attributes
TimeSpan	timing_

Member Function Documentation

changeAppearance()

virtual Appearance changeAppearance ( Appearance  desired )

pure virtual

alter appearance style, to the degree possible for this delegate.

Returns

the new Appearance style acquired

Implemented in ClipWidget, and DormantClip.

establishHookPoint()

WidgetHook::Pos establishHookPoint

(

WidgetHook *

newView

)

(re)establish current canvas attachment coordinates, thereby possibly switching to a new canvas implementation

Parameters

newView

(optional) new canvas; use existing if not given

Returns

record defining the canvas and the coordinates thereon

Definition at line 441 of file clip-widget.cpp.

References ClipDelegate::defaultOffsetY.

Referenced by ClipWidget::getClipName().

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selectAppearance()

ClipDelegate::Appearance selectAppearance ( PDelegate &  existing, Appearance  desired = PENDING, WidgetHook *  newView = nullptr, optional< TimeSpan > const &  timing = nullopt  )

static

request to change the clip delegate's appearance style, if possible.

Parameters

existing	entity to hold and maintain this specific appearance state.
desired	(optionally) the intended style or mode to acquire
newView	(optionally) a different view to hook up the delegate.
timing	position and duration of the clip, required when existing is empty

Returns

the actual mode the presentation was switched to

Remarks

switching the appearance style is a state transition; sometimes this change also implies switching the actual implementation of the delegate. And thus there can be prerequisites for achieving a specific appearance and presentation mode. Most notably, to reach any style beyond SYMBOLIC, we need to know the temporal extension of the clip. If such requirements can not be fulfilled, presentation stays or drops to the most elaborate state possible with the current configuration.

Note

This function can build a new delegate from scratch, when the existing smart-ptr is empty. However, in this case it is mandatory to pass newView

Default and fallback appearance style is PENDING, which turns the delegate into a mere data record without visual representation.

whenever a WidgetHook (instance) different than the existing one is given, the existing widget / delegate will be destroyed and replaced by a suitable copy hooked up into the new display. The base ctor #ClipData(WidgetHook&) ensures there is always a display_ (WidgetHook) to refer to.

Definition at line 417 of file clip-widget.cpp.

Referenced by ClipPresenter::establishAppearance().

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expect_and_expose_Widget()

Gtk::Widget & expect_and_expose_Widget ( PDelegate &  manager )

static

Wrapper to safely expose the actual clip implementation widget.

Exceptions

error::State

if the current presentation / appearance style does not actually use a dedicated clip widget.

Remarks

the assumption is for the caller to arrange the calling context such that existence of an actual widget can safely be assumed.

Definition at line 450 of file clip-widget.cpp.

Referenced by ClipPresenter::exposeWidget().

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Inheritance diagram for ClipDelegate:

Collaboration diagram for ClipDelegate:

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

• clip-widget.hpp
• clip-widget.cpp