More efficient animation.

cmd/passgo-gui/main.go

@@ -258,6 +258,11 @@ func eventLoop() {
 	}
 
 	listPage = func() {
+		// timing variables used for animation
+		fade1a, fade1b := 1.5, 2.0
+		start2 := float64(Config.ClearDelay)
+		fade2a, end := start2 + 1.5, start2 + 2.0
+
 		cs = flex.Flexible(1.0)
 		mux.Lock()
 		if lst.Dragging() {
@@ -289,7 +294,11 @@ func eventLoop() {
 							overlay = copied
 							overlay.Color = black
 							overlay.Background = darkgray
-							animOn()
+							w.Invalidate()
+							go func() {
+								time.Sleep(time.Second * time.Duration(fade1a))
+								animOn()
+							}()
 							go func() {
 								time.Sleep(time.Second * time.Duration(Config.ClearDelay))
 								log(Info, "clearing clipboard")
@@ -312,12 +321,19 @@ func eventLoop() {
 		}
 		flex.Layout(c1, c2)
 		x := time.Since(overlayStart).Seconds()
-		fade1a, fade1b := 1.5, 1.75
-		start2 := float64(Config.ClearDelay)
-		fade2a, end := start2 + 1.5, start2 + 1.75
-		switch {
-		case x > fade1a && x < fade1b ||
-		     x > fade2a && x < end:
+		if x >= fade1b && x < start2 && animating {
+			animOff()
+			go func() {
+				time.Sleep(time.Millisecond * time.Duration((start2 - x)*1000))
+				w.Invalidate()
+				time.Sleep(time.Millisecond * time.Duration((fade2a - start2)*1000))
+				animOn()
+			}()
+		}
+		if (x >= fade1a && x < fade1b) || (x > fade2a && x < end) {
+			if !animating {
+				animOn()
+			}
 			var fade float64
 			switch {
 			case x < fade1b:
@@ -333,9 +349,8 @@ func eventLoop() {
 			overlay.Background.G = uint8(float64(darkgray.G) * fade)
 			overlay.Background.B = uint8(float64(darkgray.B) * fade)
 			overlay.Background.A = uint8(float64(darkgray.A) * fade)
-			fallthrough
-		case x <= fade1b ||
-		     x > start2 && x < end:
+		}
+		if x <= fade1b || (x > start2 && x < end) {
 			if x > start2 && overlay == copied {
 				overlay = cleared
 				overlay.Color = black
@@ -346,7 +361,11 @@ func eventLoop() {
 			cs = al.Begin(ops, cs)
 			cs.Width.Min = cs.Width.Max
 			dims = al.End(overlay.Layout(c, ops, cs))
-		case animating && x > end:
+		}
+		if x > start2 && x < fade2a {
+		//	animOff()
+		}
+		if animating && x > end {
 			animOff()
 		}
 	}