Example of callbacks for andlabs/ui.Area

test.go

package main

import "github.com/andlabs/ui"

type AreaCallbacks struct {
	onDraw         func(a *ui.Area, dp *ui.AreaDrawParams)
	onMouseEvent   func(a *ui.Area, me *ui.AreaMouseEvent)
	onMouseCrossed func(a *ui.Area, left bool)
	onDragBroken   func(a *ui.Area)
	onKeyEvent     func(a *ui.Area, ke *ui.AreaKeyEvent) (handled bool)
}

func (c *AreaCallbacks) OnDraw(onDraw func(a *ui.Area, dp *ui.AreaDrawParams)) {
	c.onDraw = onDraw
}
func (c *AreaCallbacks) OnMouseEvent(onMouseEvent func(a *ui.Area, me *ui.AreaMouseEvent)) {
	c.onMouseEvent = onMouseEvent
}
func (c *AreaCallbacks) OnMouseCrossed(onMouseCrossed func(a *ui.Area, left bool)) {
	c.onMouseCrossed = onMouseCrossed
}
func (c *AreaCallbacks) OnDragBroken(onDragBroken func(a *ui.Area)) {
	c.onDragBroken = onDragBroken
}
func (c *AreaCallbacks) OnKeyEvent(onKeyEvent func(a *ui.Area, ke *ui.AreaKeyEvent) (handled bool)) {
	c.onKeyEvent = onKeyEvent
}

func (c *AreaCallbacks) Draw(a *ui.Area, dp *ui.AreaDrawParams) {
	c.onDraw(a, dp)
}
func (c *AreaCallbacks) MouseEvent(a *ui.Area, me *ui.AreaMouseEvent) {
	c.onMouseEvent(a, me)
}
func (c *AreaCallbacks) MouseCrossed(a *ui.Area, left bool) {
	c.onMouseCrossed(a, left)
}
func (c *AreaCallbacks) DragBroken(a *ui.Area) {
	c.onDragBroken(a)
}
func (c *AreaCallbacks) KeyEvent(a *ui.Area, ke *ui.AreaKeyEvent) (handled bool) {
	return c.onKeyEvent(a, ke)
}

func main() {
	var callbacks ui.AreaHandler
	callbacks = &AreaCallbacks{}
	_ = callbacks
}