add(project): initial commit

internal/app/app.go

@@ -0,0 +1,101 @@
+package app
+
+import (
+	"log"
+	"os"
+	"simple_ui/internal/components"
+	"simple_ui/internal/ui"
+
+	"gioui.org/app"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/unit"
+	"gioui.org/widget"
+	"gioui.org/widget/material"
+	"golang.org/x/exp/shiny/materialdesign/icons"
+)
+
+func Run() {
+	go runApp()
+	app.Main()
+}
+
+func runApp() {
+	w := &app.Window{}
+
+	w.Option(
+		app.Title("Simple UI"),
+		app.Size(800, 600),
+		app.MinSize(400, 300),
+	)
+
+	err := runWindowEvents(w)
+	if err != nil {
+		log.Fatal(err)
+	}
+	os.Exit(0)
+}
+
+func runWindowEvents(window *app.Window) error {
+	theme := material.NewTheme()
+	var ops op.Ops
+	currentPage := HomePage
+
+	navMenu := components.NewNavigationMenu(theme)
+
+	homeIcon, err := widget.NewIcon(icons.ActionHome)
+	if err != nil {
+		log.Fatalf("failed to create home icon: %v", err)
+	}
+	aboutIcon, err := widget.NewIcon(icons.ActionInfo)
+	if err != nil {
+		log.Fatalf("failed to create about icon: %v", err)
+	}
+
+	navMenu.AddItem("Home", homeIcon, func() { currentPage = HomePage })
+	navMenu.AddItem("About", aboutIcon, func() { currentPage = AboutPage })
+
+	navMenu.SetSelected(int(currentPage))
+
+	pages := []ui.Page{
+		HomePage:  ui.NewHomePage(theme),
+		AboutPage: ui.NewAboutPage(theme),
+	}
+
+	for {
+		switch e := window.Event().(type) {
+		case app.DestroyEvent:
+			return e.Err
+		case app.FrameEvent:
+			gtx := app.NewContext(&ops, e)
+
+			navMenu.HandleClicks(gtx)
+			navMenu.SetSelected(int(currentPage))
+
+			layout.Flex{
+				Axis: layout.Horizontal,
+			}.Layout(gtx,
+				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+					return navMenu.Layout(gtx)
+				}),
+				layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
+					return layout.Inset{
+						Top:    unit.Dp(16),
+						Bottom: unit.Dp(16),
+						Left:   unit.Dp(16),
+						Right:  unit.Dp(16),
+					}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
+						return pages[currentPage].Layout(gtx)
+					})
+				}),
+			)
+
+			e.Frame(gtx.Ops)
+		}
+	}
+}
+
+const (
+	HomePage = iota
+	AboutPage
+)