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We won't be needing cores either

This commit is contained in:
Sasha Koshka 2023-04-12 23:25:40 -04:00
parent b190f01a71
commit 99c890e6cd
4 changed files with 0 additions and 698 deletions
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235
elements/core/core.go
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@ -1,235 +0,0 @@
package core
import "image"
import "image/color"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/shatter"
// Core is a struct that implements some core functionality common to most
// widgets. It is meant to be embedded directly into a struct.
type Core struct {
canvas canvas.Canvas
bounds image.Rectangle
parent tomo.Parent
outer tomo.Element
metrics struct {
minimumWidth int
minimumHeight int
}
drawSizeChange func ()
onDamage func (region image.Rectangle)
}
// NewCore creates a new element core and its corresponding control given the
// element that it will be a part of. If outer is nil, this function will return
// nil.
func NewCore (
outer tomo.Element,
drawSizeChange func (),
) (
core *Core,
control CoreControl,
) {
if outer == nil { return }
core = &Core {
outer: outer,
drawSizeChange: drawSizeChange,
}
control = CoreControl { core: core }
return
}
// Bounds fulfills the tomo.Element interface. This should not need to be
// overridden.
func (core *Core) Bounds () (bounds image.Rectangle) {
if core.canvas == nil { return }
return core.bounds
}
// MinimumSize fulfils the tomo.Element interface. This should not need to be
// overridden.
func (core *Core) MinimumSize () (width, height int) {
return core.metrics.minimumWidth, core.metrics.minimumHeight
}
// MinimumSize fulfils the tomo.Element interface. This should not need to be
// overridden, unless you want to detect when the element is parented or
// unparented.
func (core *Core) SetParent (parent tomo.Parent) {
if parent != nil && core.parent != nil {
panic("core.SetParent: element already has a parent")
}
core.parent = parent
}
// DrawTo fulfills the tomo.Element interface. This should not need to be
// overridden.
func (core *Core) DrawTo (
canvas canvas.Canvas,
bounds image.Rectangle,
onDamage func (region image.Rectangle),
) {
core.canvas = canvas
core.bounds = bounds
core.onDamage = onDamage
if core.drawSizeChange != nil && core.canvas != nil {
core.drawSizeChange()
}
}
// CoreControl is a struct that can exert control over a Core struct. It can be
// used as a canvas. It must not be directly embedded into an element, but
// instead kept as a private member. When a Core struct is created, a
// corresponding CoreControl struct is linked to it and returned alongside it.
type CoreControl struct {
core *Core
}
// ColorModel fulfills the draw.Image interface.
func (control CoreControl) ColorModel () (model color.Model) {
return color.RGBAModel
}
// At fulfills the draw.Image interface.
func (control CoreControl) At (x, y int) (pixel color.Color) {
if control.core.canvas == nil { return }
return control.core.canvas.At(x, y)
}
// Bounds fulfills the draw.Image interface.
func (control CoreControl) Bounds () (bounds image.Rectangle) {
if control.core.canvas == nil { return }
return control.core.canvas.Bounds()
}
// Set fulfills the draw.Image interface.
func (control CoreControl) Set (x, y int, c color.Color) () {
if control.core.canvas == nil { return }
control.core.canvas.Set(x, y, c)
}
// Buffer fulfills the canvas.Canvas interface.
func (control CoreControl) Buffer () (data []color.RGBA, stride int) {
if control.core.canvas == nil { return }
return control.core.canvas.Buffer()
}
// Parent returns the element's parent.
func (control CoreControl) Parent () tomo.Parent {
return control.core.parent
}
// DrawBackground fills the element's canvas with the parent's background
// pattern, if the parent supports it. If it is not supported, the fallback
// pattern will be used instead.
func (control CoreControl) DrawBackground (fallback artist.Pattern) {
control.DrawBackgroundBounds(fallback, control.Bounds())
}
// DrawBackgroundBounds is like DrawBackground, but it takes in a bounding
// rectangle instead of using the element's bounds.
func (control CoreControl) DrawBackgroundBounds (
fallback artist.Pattern,
bounds image.Rectangle,
) {
parent, ok := control.Parent().(tomo.BackgroundParent)
if ok {
parent.DrawBackground(bounds)
} else if fallback != nil {
fallback.Draw(canvas.Cut(control, bounds), control.Bounds())
}
}
// DrawBackgroundBoundsShatter is like DrawBackgroundBounds, but uses the
// shattering algorithm to avoid drawing in areas specified by rocks.
func (control CoreControl) DrawBackgroundBoundsShatter (
fallback artist.Pattern,
bounds image.Rectangle,
rocks ...image.Rectangle,
) {
tiles := shatter.Shatter(bounds, rocks...)
for _, tile := range tiles {
control.DrawBackgroundBounds(fallback, tile)
}
}
// Window returns the window containing the element.
func (control CoreControl) Window () tomo.Window {
parent := control.Parent()
if parent == nil {
return nil
} else {
return parent.Window()
}
}
// Outer returns the outer element given when the control was constructed.
func (control CoreControl) Outer () tomo.Element {
return control.core.outer
}
// HasImage returns true if the core has an allocated image buffer, and false if
// it doesn't.
func (control CoreControl) HasImage () (has bool) {
return control.core.canvas != nil && !control.core.canvas.Bounds().Empty()
}
// DamageRegion pushes the selected region of pixels to the parent element. This
// does not need to be called when responding to a resize event.
func (control CoreControl) DamageRegion (regions ...image.Rectangle) {
if control.core.canvas == nil { return }
if control.core.onDamage != nil {
for _, region := range regions {
control.core.onDamage(region)
}
}
}
// DamageAll pushes all pixels to the parent element. This does not need to be
// called when redrawing in response to a change in size.
func (control CoreControl) DamageAll () {
control.DamageRegion(control.core.Bounds())
}
// SetMinimumSize sets the minimum size of this element, notifying the parent
// element in the process.
func (control CoreControl) SetMinimumSize (width, height int) {
core := control.core
if width == core.metrics.minimumWidth &&
height == core.metrics.minimumHeight {
return
}
core.metrics.minimumWidth = width
core.metrics.minimumHeight = height
if control.core.parent != nil {
control.core.parent.NotifyMinimumSizeChange(control.core.outer)
}
}
// ConstrainSize contstrains the specified width and height to the minimum width
// and height, and returns wether or not anything ended up being constrained.
func (control CoreControl) ConstrainSize (
inWidth, inHeight int,
) (
outWidth, outHeight int,
constrained bool,
) {
core := control.core
outWidth = inWidth
outHeight = inHeight
if outWidth < core.metrics.minimumWidth {
outWidth = core.metrics.minimumWidth
constrained = true
}
if outHeight < core.metrics.minimumHeight {
outHeight = core.metrics.minimumHeight
constrained = true
}
return
}

7
elements/core/doc.go
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// Package core provides tools that allow elements to easily fulfill common
// interfaces without having to duplicate a ton of code. Each "core" is a type
// that can be embedded into an element directly, working to fulfill a
// particular interface. Each one comes with a corresponding core control, which
// provides an interface for elements to exert control over the core. Core
// controls should be kept private.
package core

101
elements/core/focusable.go
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@ -1,101 +0,0 @@
package core
// import "runtime/debug"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/input"
// FocusableCore is a struct that can be embedded into objects to make them
// focusable, giving them the default keynav behavior.
type FocusableCore struct {
core CoreControl
focused bool
enabled bool
drawFocusChange func ()
}
// NewFocusableCore creates a new focusability core and its corresponding
// control. If your element needs to visually update itself when it's focus
// state changes (which it should), a callback to draw and push the update can
// be specified.
func NewFocusableCore (
core CoreControl,
drawFocusChange func (),
) (
focusable *FocusableCore,
control FocusableCoreControl,
) {
focusable = &FocusableCore {
core: core,
drawFocusChange: drawFocusChange,
enabled: true,
}
control = FocusableCoreControl { core: focusable }
return
}
// Focused returns whether or not this element is currently focused.
func (core *FocusableCore) Focused () (focused bool) {
return core.focused
}
// Focus focuses this element, if its parent element grants the request.
func (core *FocusableCore) Focus () {
if !core.enabled || core.focused { return }
parent := core.core.Parent()
if parent, ok := parent.(tomo.FocusableParent); ok {
core.focused = parent.RequestFocus (
core.core.Outer().(tomo.Focusable))
}
}
// HandleFocus causes this element to mark itself as focused, if it can
// currently be. Otherwise, it will return false and do nothing.
func (core *FocusableCore) HandleFocus (
direction input.KeynavDirection,
) (
accepted bool,
) {
direction = direction.Canon()
if !core.enabled { return false }
if core.focused && direction != input.KeynavDirectionNeutral {
return false
}
if core.focused == false {
core.focused = true
if core.drawFocusChange != nil { core.drawFocusChange() }
}
return true
}
// HandleUnfocus causes this element to mark itself as unfocused.
func (core *FocusableCore) HandleUnfocus () {
core.focused = false
// debug.PrintStack()
if core.drawFocusChange != nil { core.drawFocusChange() }
}
// Enabled returns whether or not the element is enabled.
func (core *FocusableCore) Enabled () (enabled bool) {
return core.enabled
}
// FocusableCoreControl is a struct that can be used to exert control over a
// focusability core. It must not be directly embedded into an element, but
// instead kept as a private member. When a FocusableCore struct is created, a
// corresponding FocusableCoreControl struct is linked to it and returned
// alongside it.
type FocusableCoreControl struct {
core *FocusableCore
}
// SetEnabled sets whether the focusability core is enabled. If the state
// changes, this will call drawFocusChange.
func (control FocusableCoreControl) SetEnabled (enabled bool) {
if control.core.enabled == enabled { return }
control.core.enabled = enabled
if !enabled { control.core.focused = false }
if control.core.drawFocusChange != nil {
control.core.drawFocusChange()
}
}

355
elements/core/propagator.go
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@ -1,355 +0,0 @@
package core
import "image"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/input"
// Container represents an object that can provide access to a list of child
// elements.
type Container interface {
Child (index int) tomo.Element
CountChildren () int
}
// Propagator is a struct that can be embedded into elements that contain one or
// more children in order to propagate events to them without having to write
// all of the event handlers. It also implements standard behavior for focus
// propagation and keyboard navigation.
type Propagator struct {
core CoreControl
container Container
drags [10]tomo.MouseTarget
focused bool
}
// NewPropagator creates a new event propagator that uses the specified
// container to access a list of child elements that will have events propagated
// to them. If container is nil, the function will return nil.
func NewPropagator (container Container, core CoreControl) (propagator *Propagator) {
if container == nil { return nil }
propagator = &Propagator {
core: core,
container: container,
}
return
}
// ----------- Interface fulfillment methods ----------- //
// Focused returns whether or not this element or any of its children
// are currently focused.
func (propagator *Propagator) Focused () (focused bool) {
return propagator.focused
}
// Focus focuses this element, if its parent element grants the
// request.
func (propagator *Propagator) Focus () {
if propagator.focused == true { return }
parent := propagator.core.Parent()
if parent, ok := parent.(tomo.FocusableParent); ok && parent != nil {
propagator.focused = parent.RequestFocus (
propagator.core.Outer().(tomo.Focusable))
}
}
// HandleFocus causes this element to mark itself as focused. If the
// element does not have children or there are no more focusable children in
// the given direction, it should return false and do nothing. Otherwise, it
// marks itself as focused along with any applicable children and returns
// true.
func (propagator *Propagator) HandleFocus (direction input.KeynavDirection) (accepted bool) {
direction = direction.Canon()
firstFocused := propagator.firstFocused()
if firstFocused < 0 {
// no element is currently focused, so we need to focus either
// the first or last focusable element depending on the
// direction.
switch direction {
case input.KeynavDirectionForward:
// if we recieve a forward direction, focus the first
// focusable element.
return propagator.focusFirstFocusableElement(direction)
case input.KeynavDirectionBackward:
// if we recieve a backward direction, focus the last
// focusable element.
return propagator.focusLastFocusableElement(direction)
case input.KeynavDirectionNeutral:
// if we recieve a neutral direction, just focus this
// element and nothing else.
propagator.focused = true
return true
}
} else {
// an element is currently focused, so we need to move the
// focus in the specified direction
firstFocusedChild :=
propagator.container.Child(firstFocused).
(tomo.Focusable)
// before we move the focus, the currently focused child
// may also be able to move its focus. if the child is able
// to do that, we will let it and not move ours.
if firstFocusedChild.HandleFocus(direction) {
return true
}
// find the previous/next focusable element relative to the
// currently focused element, if it exists.
for index := firstFocused + int(direction);
index < propagator.container.CountChildren() && index >= 0;
index += int(direction) {
child, focusable :=
propagator.container.Child(index).
(tomo.Focusable)
if focusable && child.HandleFocus(direction) {
// we have found one, so we now actually move
// the focus.
firstFocusedChild.HandleUnfocus()
propagator.focused = true
return true
}
}
}
return false
}
// RequestFocus notifies the parent that a child element is requesting
// keyboard focus. If the parent grants the request, the method will
// return true and the child element should behave as if a HandleFocus
// call was made.
func (propagator *Propagator) RequestFocus (
child tomo.Focusable,
) (
granted bool,
) {
if parent, ok := propagator.core.Parent().(tomo.FocusableParent); ok {
if parent.RequestFocus(propagator.core.Outer().(tomo.Focusable)) {
propagator.HandleUnfocus()
propagator.focused = true
granted = true
}
}
return
}
// RequestFocusMotion notifies the parent that a child element wants the
// focus to be moved to the next focusable element.
func (propagator *Propagator) RequestFocusNext (child tomo.Focusable) {
if !propagator.focused { return }
if parent, ok := propagator.core.Parent().(tomo.FocusableParent); ok {
parent.RequestFocusNext(propagator.core.Outer().(tomo.Focusable))
}
}
// RequestFocusMotion notifies the parent that a child element wants the
// focus to be moved to the previous focusable element.
func (propagator *Propagator) RequestFocusPrevious (child tomo.Focusable) {
if !propagator.focused { return }
if parent, ok := propagator.core.Parent().(tomo.FocusableParent); ok {
parent.RequestFocusPrevious(propagator.core.Outer().(tomo.Focusable))
}
}
// HandleDeselection causes this element to mark itself and all of its children
// as unfocused.
func (propagator *Propagator) HandleUnfocus () {
propagator.forFocusable (func (child tomo.Focusable) bool {
child.HandleUnfocus()
return true
})
propagator.focused = false
}
// HandleKeyDown propogates the keyboard event to the currently selected child.
func (propagator *Propagator) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
propagator.forFocused (func (child tomo.Focusable) bool {
typedChild, handlesKeyboard := child.(tomo.KeyboardTarget)
if handlesKeyboard {
typedChild.HandleKeyDown(key, modifiers)
}
return true
})
}
// HandleKeyUp propogates the keyboard event to the currently selected child.
func (propagator *Propagator) HandleKeyUp (key input.Key, modifiers input.Modifiers) {
propagator.forFocused (func (child tomo.Focusable) bool {
typedChild, handlesKeyboard := child.(tomo.KeyboardTarget)
if handlesKeyboard {
typedChild.HandleKeyUp(key, modifiers)
}
return true
})
}
// HandleMouseDown propagates the mouse event to the element under the mouse
// pointer.
func (propagator *Propagator) HandleMouseDown (x, y int, button input.Button) {
child, handlesMouse :=
propagator.childAt(image.Pt(x, y)).
(tomo.MouseTarget)
if handlesMouse {
propagator.drags[button] = child
child.HandleMouseDown(x, y, button)
}
}
// HandleMouseUp propagates the mouse event to the element that the released
// mouse button was originally pressed on.
func (propagator *Propagator) HandleMouseUp (x, y int, button input.Button) {
child := propagator.drags[button]
if child != nil {
propagator.drags[button] = nil
child.HandleMouseUp(x, y, button)
}
}
// HandleMotion propagates the mouse event to the element that was last
// pressed down by the mouse if the mouse is currently being held down, else it
// propagates the event to whichever element is underneath the mouse pointer.
func (propagator *Propagator) HandleMotion (x, y int) {
handled := false
for _, child := range propagator.drags {
if child, ok := child.(tomo.MotionTarget); ok {
child.HandleMotion(x, y)
handled = true
}
}
if !handled {
child := propagator.childAt(image.Pt(x, y))
if child, ok := child.(tomo.MotionTarget); ok {
child.HandleMotion(x, y)
}
}
}
// HandleScroll propagates the mouse event to the element under the mouse
// pointer.
func (propagator *Propagator) HandleScroll (x, y int, deltaX, deltaY float64) {
child := propagator.childAt(image.Pt(x, y))
if child, ok := child.(tomo.ScrollTarget); ok {
child.HandleScroll(x, y, deltaX, deltaY)
}
}
// SetTheme sets the theme of all children to the specified theme.
func (propagator *Propagator) SetTheme (theme tomo.Theme) {
propagator.forChildren (func (child tomo.Element) bool {
typedChild, themeable := child.(tomo.Themeable)
if themeable {
typedChild.SetTheme(theme)
}
return true
})
}
// SetConfig sets the theme of all children to the specified config.
func (propagator *Propagator) SetConfig (config tomo.Config) {
propagator.forChildren (func (child tomo.Element) bool {
typedChild, configurable := child.(tomo.Configurable)
if configurable {
typedChild.SetConfig(config)
}
return true
})
}
// ----------- Focusing utilities ----------- //
func (propagator *Propagator) focusFirstFocusableElement (
direction input.KeynavDirection,
) (
ok bool,
) {
propagator.forFocusable (func (child tomo.Focusable) bool {
if child.HandleFocus(direction) {
propagator.focused = true
ok = true
return false
}
return true
})
return
}
func (propagator *Propagator) focusLastFocusableElement (
direction input.KeynavDirection,
) (
ok bool,
) {
propagator.forChildrenReverse (func (child tomo.Element) bool {
typedChild, focusable := child.(tomo.Focusable)
if focusable && typedChild.HandleFocus(direction) {
propagator.focused = true
ok = true
return false
}
return true
})
return
}
// ----------- Iterator utilities ----------- //
func (propagator *Propagator) forChildren (callback func (child tomo.Element) bool) {
for index := 0; index < propagator.container.CountChildren(); index ++ {
child := propagator.container.Child(index)
if child == nil { continue }
if !callback(child) { break }
}
}
func (propagator *Propagator) forChildrenReverse (callback func (child tomo.Element) bool) {
for index := propagator.container.CountChildren() - 1; index > 0; index -- {
child := propagator.container.Child(index)
if child == nil { continue }
if !callback(child) { break }
}
}
func (propagator *Propagator) childAt (position image.Point) (child tomo.Element) {
propagator.forChildren (func (current tomo.Element) bool {
if position.In(current.Bounds()) {
child = current
}
return true
})
return
}
func (propagator *Propagator) forFocused (callback func (child tomo.Focusable) bool) {
propagator.forChildren (func (child tomo.Element) bool {
typedChild, focusable := child.(tomo.Focusable)
if focusable && typedChild.Focused() {
if !callback(typedChild) { return false }
}
return true
})
}
func (propagator *Propagator) forFocusable (callback func (child tomo.Focusable) bool) {
propagator.forChildren (func (child tomo.Element) bool {
typedChild, focusable := child.(tomo.Focusable)
if focusable {
if !callback(typedChild) { return false }
}
return true
})
}
func (propagator *Propagator) firstFocused () int {
for index := 0; index < propagator.container.CountChildren(); index ++ {
child, focusable := propagator.container.Child(index).(tomo.Focusable)
if focusable && child.Focused() {
return index
}
}
return -1
}