Class: ElementAdder

ElementAdder visitor for adding elements to tracks. Uses the visitor pattern to handle different element types and implements the Friend Class Pattern for explicit access control. Automatically calculates start and end times for elements based on existing track content.

Implements

• ElementVisitor<Promise<boolean>>

Table of contents

Constructors

• constructor

Methods

• visitVideoElement
• visitAudioElement
• visitImageElement
• visitTextElement
• visitCaptionElement
• visitIconElement
• visitCircleElement
• visitRectElement
• visitPlaceholderElement
• visitLineElement
• visitArrowElement
• visitEffectElement

Constructors

constructor

• new ElementAdder(track): ElementAdder

Creates a new ElementAdder instance for the specified track.

Parameters

Name	Type	Description
track	Track	The track to add elements to

Returns

ElementAdder

Example

const adder = new ElementAdder(track);
const success = await adder.visitVideoElement(videoElement);

Defined in

core/visitor/element-adder.ts:39

Methods

visitVideoElement

▸ visitVideoElement(element): Promise<boolean>

Adds a video element to the track. Updates video metadata and calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	VideoElement	The video element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitVideoElement(videoElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitVideoElement

Defined in

core/visitor/element-adder.ts:58

---

visitAudioElement

▸ visitAudioElement(element): Promise<boolean>

Adds an audio element to the track. Updates audio metadata and calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	AudioElement	The audio element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitAudioElement(audioElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitAudioElement

Defined in

core/visitor/element-adder.ts:88

---

visitImageElement

▸ visitImageElement(element): Promise<boolean>

Adds an image element to the track. Updates image metadata and calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	ImageElement	The image element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitImageElement(imageElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitImageElement

Defined in

core/visitor/element-adder.ts:118

---

visitTextElement

▸ visitTextElement(element): Promise<boolean>

Adds a text element to the track. Calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	TextElement	The text element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitTextElement(textElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitTextElement

Defined in

core/visitor/element-adder.ts:147

---

visitCaptionElement

▸ visitCaptionElement(element): Promise<boolean>

Adds a caption element to the track. Calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	CaptionElement	The caption element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitCaptionElement(captionElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitCaptionElement

Defined in

core/visitor/element-adder.ts:175

---

visitIconElement

▸ visitIconElement(element): Promise<boolean>

Adds an icon element to the track. Calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	IconElement	The icon element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitIconElement(iconElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitIconElement

Defined in

core/visitor/element-adder.ts:203

---

visitCircleElement

▸ visitCircleElement(element): Promise<boolean>

Adds a circle element to the track. Calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	CircleElement	The circle element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitCircleElement(circleElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitCircleElement

Defined in

core/visitor/element-adder.ts:231

---

visitRectElement

▸ visitRectElement(element): Promise<boolean>

Adds a rectangle element to the track. Calculates appropriate start/end times based on existing track elements.

Parameters

Name	Type	Description
element	RectElement	The rectangle element to add

Returns

Promise<boolean>

Promise resolving to true if element was added successfully

Example

const success = await adder.visitRectElement(rectElement);
// success = true if element was added successfully

Implementation of

ElementVisitor.visitRectElement

Defined in

core/visitor/element-adder.ts:259

---

visitPlaceholderElement

▸ visitPlaceholderElement(element): Promise<boolean>

Parameters

Name	Type
element	PlaceholderElement

Returns

Promise<boolean>

Implementation of

ElementVisitor.visitPlaceholderElement

Defined in

core/visitor/element-adder.ts:274

---

visitLineElement

▸ visitLineElement(element): Promise<boolean>

Adds a line element to the track. Uses the same default duration semantics as other simple shapes.

Parameters

Name	Type
element	LineElement

Returns

Promise<boolean>

Implementation of

ElementVisitor.visitLineElement

Defined in

core/visitor/element-adder.ts:293

---

visitArrowElement

▸ visitArrowElement(element): Promise<boolean>

Parameters

Name	Type
element	ArrowElement

Returns

Promise<boolean>

Implementation of

ElementVisitor.visitArrowElement

Defined in

core/visitor/element-adder.ts:307

---

visitEffectElement

▸ visitEffectElement(element): Promise<boolean>

Adds an effect element to the track. For now, uses the same default duration semantics as other simple elements.

Parameters

Name	Type
element	EffectElement

Returns

Promise<boolean>

Implementation of

ElementVisitor.visitEffectElement

Defined in

core/visitor/element-adder.ts:325