holy crap click handling works too

common/elements/v1/buttons/button.go

@@ -0,0 +1,50 @@
+package buttons
+
+import (
+	"git.vezzani.net/ben/games/common/elements/v1"
+	"git.vezzani.net/ben/games/common/elements/v1/blocks"
+	"git.vezzani.net/ben/games/common/elements/v1/mouse"
+)
+
+func New(ops ...Option) elements.InitFunc {
+	return func(bounds elements.Bounds) elements.Element {
+		b := Button{
+			Block: blocks.Block{ContainerBounds: bounds},
+		}
+		for op := range ops {
+			ops[op](&b)
+		}
+
+		return &b
+	}
+}
+
+type Button struct {
+	blocks.Block
+
+	onClick     func(ms mouse.State)
+	onMouseDown func(ms mouse.State)
+	onMouseUp   func(ms mouse.State)
+}
+
+func (b *Button) HandleMouseEvent(ms mouse.State) bool {
+	if !b.Block.ContainerBounds.Contains(elements.Point{
+		X: float64(ms.X),
+		Y: float64(ms.Y),
+	}) {
+		return false
+	}
+	switch {
+	case b.onClick != nil && (ms.RightClicked || ms.LeftClicked):
+		b.onClick(ms)
+		return true
+	case b.onMouseUp != nil && (ms.RightChanged && !ms.RightDown || ms.LeftChanged && !ms.LeftDown):
+		b.onMouseUp(ms)
+		return true
+	case b.onMouseDown != nil && (ms.RightChanged && ms.RightDown || ms.LeftChanged && ms.LeftDown):
+		b.onMouseDown(ms)
+		return true
+	}
+
+	return false
+}

common/elements/v1/buttons/options.go

@@ -0,0 +1,32 @@
+package buttons
+
+import (
+	"git.vezzani.net/ben/games/common/elements/v1/blocks"
+	"git.vezzani.net/ben/games/common/elements/v1/mouse"
+)
+
+type Option func(button *Button)
+
+func OnClick(f func(ms mouse.State)) Option {
+	return func(button *Button) {
+		button.onClick = f
+	}
+}
+
+func OnMouseDown(f func(ms mouse.State)) Option {
+	return func(button *Button) {
+		button.onMouseDown = f
+	}
+}
+
+func OnMouseUp(f func(ms mouse.State)) Option {
+	return func(button *Button) {
+		button.onMouseUp = f
+	}
+}
+
+func BlockOpt(o blocks.Option) Option {
+	return func(s *Button) {
+		o(&s.Block)
+	}
+}