Redid cores to conform to the new API changes

elements/container.go

@@ -1,4 +1,4 @@
-package element
+package elements
 
 import "git.tebibyte.media/sashakoshka/tomo/input"
 

elements/core/core.go

@@ -3,31 +3,38 @@ package core
 import "image"
 import "image/color"
 import "git.tebibyte.media/sashakoshka/tomo/canvas"
+import "git.tebibyte.media/sashakoshka/tomo/elements"
 
 // 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 elements.Parent
+	outer  elements.Element
 
 	metrics struct {
 		minimumWidth  int
 		minimumHeight int
 	}
 
-	drawSizeChange      func ()
+	drawSizeChange func ()
-	onMinimumSizeChange func ()
+	onDamage       func (region image.Rectangle)
-	onDamage func (region canvas.Canvas)
 }
 
-// NewCore creates a new element core and its corresponding control.
+// 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 elements.Element,
 	drawSizeChange func (),
 ) (
 	core *Core,
 	control CoreControl,
 ) {
+	if outer == nil { return }
 	core = &Core {
+		outer:          outer,
 		drawSizeChange: drawSizeChange,
 	}
 	control = CoreControl { core: core }