54 lines
2.0 KiB
Go
54 lines
2.0 KiB
Go
package elements
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// Parent represents a type capable of containing child elements.
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type Parent interface {
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// NotifyMinimumSizeChange notifies the container that a child element's
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// minimum size has changed. This method is expected to be called by
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// child elements when their minimum size changes.
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NotifyMinimumSizeChange (child Element)
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}
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// FocusableParent represents a parent with keyboard navigation support.
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type FocusableParent interface {
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Parent
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// RequestFocus notifies the parent that a child element is requesting
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// keyboard focus. If the parent grants the request, the method will
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// return true and the child element should behave as if a HandleFocus
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// call was made.
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RequestFocus (child Focusable) (granted bool)
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// RequestFocusMotion notifies the parent that a child element wants the
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// focus to be moved to the next focusable element.
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RequestFocusNext (child Focusable)
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// RequestFocusMotion notifies the parent that a child element wants the
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// focus to be moved to the previous focusable element.
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RequestFocusPrevious (child Focusable)
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}
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// FlexibleParent represents a parent that accounts for elements with
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// flexible height.
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type FlexibleParent interface {
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Parent
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// NotifyFlexibleHeightChange notifies the parent that the parameters
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// affecting a child's flexible height have changed. This method is
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// expected to be called by flexible child element when their content
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// changes.
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NotifyFlexibleHeightChange (child Flexible)
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}
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// ScrollableParent represents a parent that can change the scroll
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// position of its child element(s).
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type ScrollableParent interface {
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Parent
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// NotifyScrollBoundsChange notifies the parent that a child's scroll
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// content bounds or viewport bounds have changed. This is expected to
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// be called by child elements when they change their supported scroll
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// axes, their scroll position (either autonomously or as a result of a
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// call to ScrollTo()), or their content size.
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NotifyScrollBoundsChange (child Scrollable)
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}
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