161 lines
5.3 KiB
Markdown
161 lines
5.3 KiB
Markdown
# Container
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_A fundamental layout element that manages child UI components. Containers handle element organization, event propagation, _
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_rendering hierarchy, and coordinate space management. They serve as the backbone of Basalt's UI structure by providing:_
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_- Child element management and organization_
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_- Event bubbling and distribution_
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_- Visibility calculations and clipping_
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_- Focus management_
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_- Coordinate space transformation_
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Extends: `VisualElement`
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## Properties
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|Property|Type|Default|Description|
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|children|table|{}|Collection of all child elements|
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|childrenSorted|boolean|true|Indicates if children are sorted by z-index|
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|childrenEventsSorted|boolean|true|Indicates if event handlers are properly sorted|
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|childrenEvents|table|{}|Registered event handlers for all children|
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|eventListenerCount|table|{}|Number of listeners per event type|
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|focusedChild|table|nil|Currently focused child element (receives keyboard events)|
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|visibleChildren|table|{}|Currently visible child elements (calculated based on viewport)|
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|visibleChildrenEvents|table|{}|Event handlers for currently visible children|
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|offsetX|number|0|Horizontal scroll/content offset|
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|offsetY|number|0|Vertical scroll/content offset|
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## Functions
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|Method|Returns|Description|
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|[Container:isChildVisible](#container-ischildvisible-child)|boolean|Checks if a child element is visible|
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|[Container:addChild](#container-addchild-child)|Container|Adds a child element to the container|
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|[Container:clear](#container-clear)|Container|Removes all children and resets container|
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|[Container:sortChildren](#container-sortchildren)|Container|Updates child element ordering|
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|[Container:sortChildrenEvents](#container-sortchildrenevents-eventname)|Container|Sorts the children events of the container|
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|[Container:registerChildrenEvents](#container-registerchildrenevents-child)|Container|Registers the children events of the container|
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|[Container:registerChildEvent](#container-registerchildevent-child-eventname)|Container|Sets up event handling for a child|
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|[Container:removeChildrenEvents](#container-removechildrenevents-child)|Container|Unregisters the children events of the container|
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|[Container:unregisterChildEvent](#container-unregisterchildevent-child-eventname)|Container|Unregisters the children events of the container|
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|[Container:removeChild](#container-removechild-child)|Container|Removes a child element from the container|
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|[Container:getChild](#container-getchild-path)|child|Finds a child element by its path|
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|[Container:callChildrenEvent](#container-callchildrenevent-visibleonly-event)|boolean, child|Calls a event on all children|
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## Container:isChildVisible(child)
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Tests whether a child element is currently visible within the container's viewport
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### Parameters
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* `child` `table` The child element to check
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### Returns
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* `boolean` `isVisible` Whether the child is within view bounds
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## Container:addChild(child)
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Adds a new element to this container's hierarchy
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### Parameters
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* `child` `table` The element to add as a child
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### Returns
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* `Container` `self` For method chaining
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## Container:clear()
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Removes all child elements and resets the container's state
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### Returns
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* `Container` `self` For method chaining
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## Container:sortChildren()
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Re-sorts children by their z-index and updates visibility
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### Returns
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* `Container` `self` For method chaining
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## Container:sortChildrenEvents(eventName)
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Sorts the children events of the container
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### Parameters
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* `eventName` `string` The event name to sort
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### Returns
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* `Container` `self` The container instance
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## Container:registerChildrenEvents(child)
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Registers the children events of the container
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### Parameters
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* `child` `table` The child to register events for
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### Returns
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* `Container` `self` The container instance
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## Container:registerChildEvent(child, eventName)
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Registers an event handler for a specific child element
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### Parameters
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* `child` `table` The child element to register events for
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* `eventName` `string` The name of the event to register
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### Returns
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* `Container` `self` For method chaining
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## Container:removeChildrenEvents(child)
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Unregisters the children events of the container
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### Parameters
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* `child` `table` The child to unregister events for
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### Returns
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* `Container` `self` The container instance
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## Container:unregisterChildEvent(child, eventName)
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Unregisters the children events of the container
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### Parameters
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* `child` `table` The child to unregister events for
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* `eventName` `string` The event name to unregister
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### Returns
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* `Container` `self` The container instance
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## Container:removeChild(child)
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Removes an element from this container's hierarchy and cleans up its events
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### Parameters
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* `child` `table` The element to remove
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### Returns
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* `Container` `self` For method chaining
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## Container:getChild(path)
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Locates a child element using a path-like syntax (e.g. "panel/button1")
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### Parameters
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* `path` `string` Path to the child (e.g. "panel/button1", "header/title")
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### Returns
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* `child` `The` found element or nil if not found
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## Container:callChildrenEvent(visibleOnly, event)
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Calls a event on all children
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### Parameters
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* `visibleOnly` `boolean` Whether to only call the event on visible children
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* `event` `string` The event to call
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### Returns
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* `boolean` `handled` Whether the event was handled
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* `child` `The` child that handled the event
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