From ff5293e4cbf7b116715fce5b5e91f907ca41a3de Mon Sep 17 00:00:00 2001
From: faiface <faiface2202@gmail.com>
Date: Mon, 6 May 2019 00:42:28 +0200
Subject: examples: add imageviewer

---
 examples/imageviewer/splits.go | 112 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 examples/imageviewer/splits.go

(limited to 'examples/imageviewer/splits.go')

diff --git a/examples/imageviewer/splits.go b/examples/imageviewer/splits.go
new file mode 100644
index 0000000..041a770
--- /dev/null
+++ b/examples/imageviewer/splits.go
@@ -0,0 +1,112 @@
+package main
+
+import (
+	"image"
+	"image/draw"
+
+	"github.com/faiface/gui"
+)
+
+type envPair struct {
+	events <-chan gui.Event
+	draw   chan<- func(draw.Image) image.Rectangle
+}
+
+func (ep *envPair) Events() <-chan gui.Event                      { return ep.events }
+func (ep *envPair) Draw() chan<- func(draw.Image) image.Rectangle { return ep.draw }
+
+func FixedLeft(env gui.Env, maxX int) gui.Env {
+	out, in := gui.MakeEventsChan()
+
+	go func() {
+		for e := range env.Events() {
+			var minX, minY, dummy, maxY int
+			switch {
+			case e.Matches("resize/%d/%d/%d/%d", &minX, &minY, &dummy, &maxY):
+				in <- gui.Eventf("resize/%d/%d/%d/%d", minX, minY, maxX, maxY)
+			default:
+				in <- e
+			}
+		}
+		close(in)
+	}()
+
+	return &envPair{out, env.Draw()}
+}
+
+func FixedRight(env gui.Env, minX int) gui.Env {
+	out, in := gui.MakeEventsChan()
+
+	go func() {
+		for e := range env.Events() {
+			var dummy, minY, maxX, maxY int
+			switch {
+			case e.Matches("resize/%d/%d/%d/%d", &dummy, &minY, &maxX, &maxY):
+				in <- gui.Eventf("resize/%d/%d/%d/%d", minX, minY, maxX, maxY)
+			default:
+				in <- e
+			}
+		}
+		close(in)
+	}()
+
+	return &envPair{out, env.Draw()}
+}
+
+func FixedTop(env gui.Env, maxY int) gui.Env {
+	out, in := gui.MakeEventsChan()
+
+	go func() {
+		for e := range env.Events() {
+			var minX, minY, maxX, dummy int
+			switch {
+			case e.Matches("resize/%d/%d/%d/%d", &minX, &minY, &maxX, &dummy):
+				in <- gui.Eventf("resize/%d/%d/%d/%d", minX, minY, maxX, maxY)
+			default:
+				in <- e
+			}
+		}
+		close(in)
+	}()
+
+	return &envPair{out, env.Draw()}
+}
+
+func FixedBottom(env gui.Env, minY int) gui.Env {
+	out, in := gui.MakeEventsChan()
+
+	go func() {
+		for e := range env.Events() {
+			var minX, dummy, maxX, maxY int
+			switch {
+			case e.Matches("resize/%d/%d/%d/%d", &minX, &dummy, &maxX, &maxY):
+				in <- gui.Eventf("resize/%d/%d/%d/%d", minX, minY, maxX, maxY)
+			default:
+				in <- e
+			}
+		}
+		close(in)
+	}()
+
+	return &envPair{out, env.Draw()}
+}
+
+func EvenHorizontal(env gui.Env, minI, maxI, n int) gui.Env {
+	out, in := gui.MakeEventsChan()
+
+	go func() {
+		for e := range env.Events() {
+			var minX, minY, maxX, maxY int
+			switch {
+			case e.Matches("resize/%d/%d/%d/%d", &minX, &minY, &maxX, &maxY):
+				minX, maxX := minX+(maxX-minX)*minI/n, minX+(maxX-minX)*maxI/n
+				in <- gui.Eventf("resize/%d/%d/%d/%d", minX, minY, maxX, maxY)
+			default:
+				in <- e
+			}
+		}
+		close(in)
+	}()
+
+	return &envPair{out, env.Draw()}
+}
-- 
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