From fa7796a4ae0f12114cc7b187a3bf489fe474f453 Mon Sep 17 00:00:00 2001
From: Sander Schobers <sander@schobers.eu>
Date: Wed, 10 Apr 2019 21:20:39 +0200
Subject: [PATCH] Added support for animations.

---
 ui/context.go | 14 +++++++++-----
 ui/ui.go      | 13 +++++++++++++
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/ui/context.go b/ui/context.go
index a3eef44..fa62457 100644
--- a/ui/context.go
+++ b/ui/context.go
@@ -1,6 +1,7 @@
 package ui
 
 type Context interface {
+	Animate()
 	HasQuit() bool
 	Images() *Images
 	Quit()
@@ -12,13 +13,16 @@ var _ Context = &context{}
 var _ EventTarget = &context{}
 
 type context struct {
-	quit  bool
-	r     Renderer
-	view  Control
-	ims   *Images
-	style *Style
+	animate bool
+	quit    bool
+	r       Renderer
+	view    Control
+	ims     *Images
+	style   *Style
 }
 
+func (c *context) Animate() { c.animate = true }
+
 func (c *context) HasQuit() bool { return c.quit }
 
 func (c *context) Images() *Images { return c.ims }
diff --git a/ui/ui.go b/ui/ui.go
index d6e35e9..8969ca6 100644
--- a/ui/ui.go
+++ b/ui/ui.go
@@ -1,6 +1,8 @@
 package ui
 
 import (
+	"time"
+
 	"opslag.de/schobers/geom"
 )
 
@@ -16,6 +18,16 @@ func RunWait(r Renderer, s *Style, view Control, wait bool) error {
 	if ok {
 		root.Init(ctx)
 	}
+	anim := time.NewTicker(30 * time.Millisecond)
+	go func() {
+		for range anim.C {
+			if ctx.animate && !ctx.quit {
+				r.Refresh()
+			}
+			ctx.animate = false
+		}
+	}()
+	ctx.Renderer().Refresh()
 	for !ctx.quit {
 		var size = r.Size()
 		var bounds = geom.RectF32(0, 0, size.X, size.Y)
@@ -26,5 +38,6 @@ func RunWait(r Renderer, s *Style, view Control, wait bool) error {
 		}
 		r.PushEvents(ctx, wait)
 	}
+	anim.Stop()
 	return nil
 }