Entities must support all behaviors
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Sasha Koshka
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// Package ability defines extended interfaces that elements and entities can
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// support.
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//
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// Note that backends must give an entity that satisfies the corresponding
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// entity interface to an element satisfying a given element interface.
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package ability
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// Package ability defines extended interfaces that elements can support.
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package ability
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import "image"
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package ability
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo"
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// LayoutEntity is given to elements that support the Layoutable interface.
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type LayoutEntity interface {
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tomo.Entity
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// InvalidateLayout marks the element's layout as invalid. At the end of
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// every event, the backend will ask all invalid elements to recalculate
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// their layouts.
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InvalidateLayout ()
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}
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// ContainerEntity is given to elements that support the Container interface.
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type ContainerEntity interface {
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tomo.Entity
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LayoutEntity
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// Adopt adds an element as a child.
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Adopt (child tomo.Element)
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// Insert inserts an element in the child list at the specified
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// location.
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Insert (index int, child tomo.Element)
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// Disown removes the child at the specified index.
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Disown (index int)
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// IndexOf returns the index of the specified child.
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IndexOf (child tomo.Element) int
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// Child returns the child at the specified index.
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Child (index int) tomo.Element
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// CountChildren returns the amount of children the element has.
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CountChildren () int
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// PlaceChild sets the size and position of the child at the specified
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// index to a bounding rectangle.
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PlaceChild (index int, bounds image.Rectangle)
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// SelectChild marks a child as selected or unselected, if it is
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// selectable.
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SelectChild (index int, selected bool)
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// ChildMinimumSize returns the minimum size of the child at the
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// specified index.
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ChildMinimumSize (index int) (width, height int)
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}
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// FocusableEntity is given to elements that support the Focusable interface.
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type FocusableEntity interface {
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tomo.Entity
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// Focused returns whether the element currently has input focus.
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Focused () bool
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// Focus sets this element as focused. If this succeeds, the element will
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// recieve a HandleFocus call.
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Focus ()
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// FocusNext causes the focus to move to the next element. If this
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// succeeds, the element will recieve a HandleUnfocus call.
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FocusNext ()
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// FocusPrevious causes the focus to move to the next element. If this
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// succeeds, the element will recieve a HandleUnfocus call.
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FocusPrevious ()
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}
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// SelectableEntity is given to elements that support the Selectable interface.
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type SelectableEntity interface {
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tomo.Entity
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// Selected returns whether this element is currently selected.
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Selected () bool
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}
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// FlexibleEntity is given to elements that support the Flexible interface.
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type FlexibleEntity interface {
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tomo.Entity
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// NotifyFlexibleHeightChange notifies the system that the parameters
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// affecting the element's flexible height have changed. This method is
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// expected to be called by flexible elements when their content changes.
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NotifyFlexibleHeightChange ()
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}
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// ScrollableEntity is given to elements that support the Scrollable interface.
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type ScrollableEntity interface {
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tomo.Entity
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// NotifyScrollBoundsChange notifies the system that the element's
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// scroll content bounds or viewport bounds have changed. This is
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// expected to be called by scrollable elements when they change their
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// supported scroll axes, their scroll position (either autonomously or
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// as a result of a call to ScrollTo()), or their content size.
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NotifyScrollBoundsChange ()
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}
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// ThemeableEntity is given to elements that support the Themeable interface.
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type ThemeableEntity interface {
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tomo.Entity
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// Theme returns the currently active theme. When this value changes,
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// the HandleThemeChange method of the element is called.
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Theme () tomo.Theme
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}
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// ConfigurableEntity is given to elements that support the Configurable
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// interface.
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type ConfigurableEntity interface {
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tomo.Entity
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// Config returns the currently active config. When this value changes,
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// the HandleThemeChange method of the element is called.
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Config () tomo.Config
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}
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82
entity.go
82
entity.go
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@ -11,6 +11,11 @@ type Entity interface {
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// themselves.
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Invalidate ()
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// InvalidateLayout marks the element's layout as invalid. At the end of
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// every event, the backend will ask all invalid elements to recalculate
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// their layouts.
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InvalidateLayout ()
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// Bounds returns the bounds of the element to be used for drawing and
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// layout.
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Bounds () image.Rectangle
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@ -29,4 +34,81 @@ type Entity interface {
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// directly inside of the window), the backend will draw a default
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// background pattern.
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DrawBackground (artist.Canvas)
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// --- Behaviors relating to parenting ---
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// Adopt adds an element as a child.
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Adopt (child Element)
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// Insert inserts an element in the child list at the specified
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// location.
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Insert (index int, child Element)
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// Disown removes the child at the specified index.
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Disown (index int)
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// IndexOf returns the index of the specified child.
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IndexOf (child Element) int
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// Child returns the child at the specified index.
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Child (index int) Element
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// CountChildren returns the amount of children the element has.
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CountChildren () int
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// PlaceChild sets the size and position of the child at the specified
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// index to a bounding rectangle.
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PlaceChild (index int, bounds image.Rectangle)
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// SelectChild marks a child as selected or unselected, if it is
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// selectable.
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SelectChild (index int, selected bool)
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// ChildMinimumSize returns the minimum size of the child at the
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// specified index.
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ChildMinimumSize (index int) (width, height int)
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// --- Behaviors relating to input focus ---
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// Focused returns whether the element currently has input focus.
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Focused () bool
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// Focus sets this element as focused. If this succeeds, the element will
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// recieve a HandleFocus call.
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Focus ()
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// FocusNext causes the focus to move to the next element. If this
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// succeeds, the element will recieve a HandleUnfocus call.
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FocusNext ()
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// FocusPrevious causes the focus to move to the next element. If this
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// succeeds, the element will recieve a HandleUnfocus call.
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FocusPrevious ()
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// Selected returns whether this element is currently selected.
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Selected () bool
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// --- Behaviors relating to scrolling --- //
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// NotifyFlexibleHeightChange notifies the system that the parameters
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// affecting the element's flexible height have changed. This method is
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// expected to be called by flexible elements when their content changes.
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NotifyFlexibleHeightChange ()
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// NotifyScrollBoundsChange notifies the system that the element's
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// scroll content bounds or viewport bounds have changed. This is
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// expected to be called by scrollable elements when they change their
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// supported scroll axes, their scroll position (either autonomously or
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// as a result of a call to ScrollTo()), or their content size.
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NotifyScrollBoundsChange ()
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// --- Behaviors relating to themeing ---
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// Theme returns the currently active theme. When this value changes,
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// the HandleThemeChange method of the element is called.
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Theme () Theme
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// Config returns the currently active config. When this value changes,
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// the HandleThemeChange method of the element is called.
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Config () Config
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}
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