atomize-element-interface #3

Merged
sashakoshka merged 10 commits from atomize-element-interface into main 2023-01-17 12:33:23 -07:00
5 changed files with 55 additions and 3 deletions
Showing only changes of commit 7754679710 - Show all commits

View File

@ -261,6 +261,20 @@ func (window *Window) childSelectionRequestCallback () (granted bool) {
return true
}
func (window *Window) childSelectionMotionRequestCallback (
direction tomo.SelectionDirection,
) (
granted bool,
) {
if child, ok := window.child.(tomo.Selectable); ok {
if !child.HandleSelection(direction) {
child.HandleDeselection()
}
return true
}
return true
}
func (window *Window) pushRegion (region image.Rectangle) {
if window.xCanvas == nil { panic("whoopsie!!!!!!!!!!!!!!") }
image, ok := window.xCanvas.SubImage(region).(*xgraphics.Image)

View File

@ -3,7 +3,8 @@ package tomo
// ParentHooks is a struct that contains callbacks that let child elements send
// information to their parent element without the child element knowing
// anything about the parent element or containing any reference to it. When a
// parent element adopts a child element, it must set these callbacks.
// parent element adopts a child element, it must set these callbacks. They are
// allowed to be nil.
type ParentHooks struct {
// Draw is called when a part of the child element's surface is updated.
// The updated region will be passed to the callback as a sub-image.
@ -20,6 +21,10 @@ type ParentHooks struct {
// request, it must send the child element a selection event and return
// true.
SelectionRequest func () (granted bool)
// SelectionMotionRequest is called when the child element wants the
// parent element to select the previous/next element in relation to it.
SelectionMotionRequest func (direction SelectionDirection) (granted bool)
}
// RunDraw runs the Draw hook if it is not nil. If it is nil, it does nothing.
@ -46,6 +51,19 @@ func (hooks ParentHooks) RunSelectionRequest () (granted bool) {
return
}
// RunSelectionMotionRequest runs the SelectionMotionRequest hook if it is not
// nil. If it is nil, it does nothing.
func (hooks ParentHooks) RunSelectionMotionRequest (
direction SelectionDirection,
) (
granted bool,
) {
if hooks.SelectionMotionRequest != nil {
granted = hooks.SelectionMotionRequest(direction)
}
return
}
// Element represents a basic on-screen object.
type Element interface {
// Element must implement the Canvas interface. Elements should start

View File

@ -103,6 +103,7 @@ func (element *Button) HandleSelection (
) (
accepted bool,
) {
direction = direction.Canon()
if !element.enabled { return false }
if element.selected && direction != tomo.SelectionDirectionNeutral {
return false

View File

@ -43,6 +43,9 @@ func (element *Container) SetLayout (layout tomo.Layout) {
// whatever way is defined by the current layout.
func (element *Container) Adopt (child tomo.Element, expand bool) {
child.SetParentHooks (tomo.ParentHooks {
Draw: func (region tomo.Canvas) {
element.drawChildRegion(child, region)
},
MinimumSizeChange: func (int, int) {
element.updateMinimumSize()
},
@ -51,8 +54,12 @@ func (element *Container) Adopt (child tomo.Element, expand bool) {
if !selectable { return }
return element.childSelectionRequestCallback(child)
},
Draw: func (region tomo.Canvas) {
element.drawChildRegion(child, region)
SelectionMotionRequest: func (
direction tomo.SelectionDirection,
) (
granted bool,
) {
return element.core.RequestSelectionMotion(direction)
},
})
element.children = append (element.children, tomo.LayoutEntry {

View File

@ -80,6 +80,18 @@ func (control CoreControl) RequestSelection () (granted bool) {
return control.core.hooks.RunSelectionRequest()
}
// RequestSelectionMotion requests that the element's parent deselect this
// element and select the one to the left or right of it, depending on the
// direction. If the requests was granted, it returns true. If it was denied, it
// returns false.
func (control CoreControl) RequestSelectionMotion (
direction tomo.SelectionDirection,
) (
granted bool,
) {
return control.core.hooks.RunSelectionMotionRequest(direction)
}
// HasImage returns true if the core has an allocated image buffer, and false if
// it doesn't.
func (control CoreControl) HasImage () (has bool) {