Did a lot of work off-repo, basically init

ui/component.go

@@ -0,0 +1,39 @@
+package ui
+
+import (
+	"github.com/gdamore/tcell/v2"
+)
+
+// A Component refers generally to the behavior of a UI "component". Components
+// include buttons, input fields, and labels. It is expected that after constructing
+// a component, to call the SetPos() function, and possibly SetSize() as well.
+//
+// Many components implement their own `New...()` function. In those constructor
+// functions, it is good practice for that component to set its size to be its
+// minimum size. TODO: implement that behavior
+type Component interface {
+	// A component knows its position and size, which is used to draw itself in
+	// its bounding rectangle.
+	Draw(tcell.Screen)
+	// Components can be focused, which may affect how it handles events. For
+	// example, when a button is focused, the Return key may be pressed to
+	// activate the button.
+	SetFocused(bool)
+	// Applies the theme to the component and all of its children.
+	SetTheme(*Theme)
+
+	// Get position of the Component.
+	GetPos() (int, int)
+	// Set position of the Component.
+	SetPos(int, int)
+
+	// Returns the smallest size the Component can be.
+	GetMinSize() (int, int)
+	// Get size of the Component.
+	GetSize() (int, int)
+	// Set size of the component. If size is smaller than minimum, minimum is
+	// used, instead.
+	SetSize(int, int)
+
+	tcell.EventHandler // A Component can handle events
+}