Initial commit.

main.go

@@ -0,0 +1,131 @@
+package main
+
+import (
+	"log"
+	"time"
+
+	"gioui.org/ui"
+	"gioui.org/ui/app"
+	"gioui.org/ui/input"
+	"gioui.org/ui/layout"
+	"gioui.org/ui/measure"
+	"gioui.org/ui/text"
+	//"gioui.org/ui/input"
+
+	"golang.org/x/image/font/gofont/goregular"
+	"golang.org/x/image/font/sfnt"
+)
+
+type Context struct {
+	c *app.Config
+	q input.Queue
+	ops *ui.Ops
+	cs layout.Constraints
+	dims layout.Dimens
+	faces measure.Faces
+}
+
+func NewContext() *Context {
+	return &Context{ops: new(ui.Ops)}
+}
+
+func (ctx *Context) Reset(w *app.Window, e app.DrawEvent) {
+	ctx.c = &e.Config
+	ctx.q = w.Queue()
+	ctx.ops.Reset()
+	ctx.cs = layout.RigidConstraints(e.Size)
+	ctx.faces.Reset(ctx.c)
+}
+
+func (fw fWidget) Layout(c ui.Config, q input.Queue, ops *ui.Ops, cs layout.Constraints) layout.Dimens {
+	return fw.l(c, q, ops, cs)
+}
+
+type Widget interface {
+	Layout(ui.Config, input.Queue, *ui.Ops, layout.Constraints) layout.Dimens
+}
+
+type fWidget struct {
+	l Layout
+}
+
+type WidgetCombinator func(...Widget) Widget
+
+type Layout func(ui.Config, input.Queue, *ui.Ops, layout.Constraints) layout.Dimens
+
+func (ctx *Context) Do(ls ...Layout) {
+	for _, l := range ls {
+		ctx.dims = l(ctx.c, ctx.q, ctx.ops, ctx.cs)
+	}
+}
+
+func main() {
+	go func() {
+		w := app.NewWindow(nil)
+		regular, err := sfnt.Parse(goregular.TTF)
+		if err != nil {
+			log.Fatal("Cannot parse font.")
+		}
+		ctx := NewContext()
+		t := time.NewTicker(time.Second/30)
+		e1 := &text.Editor{
+			Face: ctx.faces.For(regular, ui.Sp(24)),
+			SingleLine: true,
+		}
+		e1.SetText("hi there")
+		e1.Focus()
+
+		e2 := &text.Editor{
+			Face: ctx.faces.For(regular, ui.Sp(24)),
+			SingleLine: true,
+		}
+		e2.SetText("ok bye")
+
+		for {
+			select {
+			case <-t.C:
+				w.Invalidate()
+			case e := <-w.Events():
+				switch e := e.(type) {
+				case app.DestroyEvent:
+					return
+				case app.DrawEvent:
+					ctx.Reset(w,e)
+
+					f := Flex(layout.Vertical, layout.Start, layout.Start)
+					//f(e1,e2).Layout(ctx.c, ctx.q, ctx.ops, ctx.cs)
+					ctx.Do(f(e1,e2).Layout)
+					w.Draw(ctx.ops)
+				}
+			}
+		}
+	}()
+	app.Main()
+}
+
+func Flex(axis layout.Axis, mainAxisAlignment layout.MainAxisAlignment, crossAxisAlignment layout.CrossAxisAlignment) WidgetCombinator {
+	f := layout.Flex{
+		Axis: axis,
+		MainAxisAlignment: mainAxisAlignment,
+		CrossAxisAlignment: crossAxisAlignment,
+	}
+	return func(ws ...Widget) Widget {
+		ret := fWidget{}
+		ret.l = func(c ui.Config, q input.Queue, ops *ui.Ops, cs layout.Constraints) layout.Dimens {
+			f.Init(ops, cs)
+			cs = f.Rigid()
+			var dims layout.Dimens
+			fcs := make([]layout.FlexChild,len(ws))
+			for i, w := range ws {
+				if i > 0 {
+					cs = f.Flexible(1)
+				}
+				dims = w.Layout(c, q, ops, cs)
+				fcs[i] = f.End(dims)
+			}
+			return f.Layout(fcs...)
+		}
+		return ret
+	}
+}
+