From b431e44110630be5b8898b9abaa158773beddf41 Mon Sep 17 00:00:00 2001
From: Sander Schobers <sander@schobers.eu>
Date: Sat, 28 Mar 2020 10:50:40 +0100
Subject: [PATCH] Added application.

---
 alui/application.go | 117 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 alui/application.go

diff --git a/alui/application.go b/alui/application.go
new file mode 100644
index 0000000..cdd0703
--- /dev/null
+++ b/alui/application.go
@@ -0,0 +1,117 @@
+package alui
+
+import (
+	"errors"
+
+	"github.com/spf13/afero"
+	"opslag.de/schobers/allg5"
+	"opslag.de/schobers/fs/vfs"
+	"opslag.de/schobers/geom"
+)
+
+type Application struct {
+	disp *allg5.Display
+	eq   *allg5.EventQueue
+	dirs map[string]vfs.CopyDir
+}
+
+func NewApplication(size geom.Point, dispOptions allg5.NewDisplayOptions) (*Application, error) {
+	var init = allg5.InitAll
+	init.Audio = false
+	err := allg5.Init(init)
+	if err != nil {
+		return nil, err
+	}
+
+	app := &Application{}
+
+	disp, err := allg5.NewDisplay(size.X, size.Y, dispOptions)
+	if err != nil {
+		return nil, err
+	}
+	app.disp = disp
+
+	eq, err := allg5.NewEventQueue()
+	if err != nil {
+		app.Destroy()
+		return nil, err
+	}
+	app.eq = eq
+
+	eq.RegisterDisplay(disp)
+	eq.RegisterKeyboard()
+	eq.RegisterMouse()
+
+	return app, nil
+}
+
+func (a *Application) Destroy() {
+	a.disp.Destroy()
+	a.eq.Destroy()
+	if a.dirs != nil {
+		for _, dir := range a.dirs {
+			dir.Destroy()
+		}
+	}
+}
+
+func (a *Application) AddDir(path string, backup afero.Fs) (vfs.CopyDir, error) {
+	fs := vfs.NewOsFsFallback(path, backup)
+	copy, err := vfs.NewCopyDir(fs)
+	if err != nil {
+		return nil, err
+	}
+	if a.dirs == nil {
+		a.dirs = map[string]vfs.CopyDir{}
+	}
+	a.dirs[path] = copy
+	return copy, nil
+}
+
+func (a *Application) UseFile(dir, name string, use func(string) error) error {
+	if a.dirs == nil {
+		return errors.New(`no directories available`)
+	}
+	resources, ok := a.dirs[dir]
+	if !ok {
+		return errors.New(`direct not found`)
+	}
+	path, err := resources.Retrieve(name)
+	if err != nil {
+		return err
+	}
+	return use(path)
+}
+
+func (a *Application) Run(main Control, init func(*UI) error) error {
+	disp := a.disp
+	eq := a.eq
+
+	ui := NewUI(disp, main)
+	defer ui.Destroy()
+	err := init(ui)
+	if err != nil {
+		return err
+	}
+
+	ctx := ui.Context()
+	for {
+		allg5.ClearToColor(ctx.Palette.Icon)
+		ui.Render()
+		disp.Flip()
+
+		e := eq.Get()
+		for e != nil {
+			switch e := e.(type) {
+			case *allg5.DisplayCloseEvent:
+				return nil
+			case *allg5.KeyCharEvent:
+				if e.KeyCode == allg5.KeyF4 && e.Modifiers&allg5.KeyModAlt != 0 {
+					return nil
+				}
+			}
+			ui.Handle(e)
+			e = eq.Get()
+		}
+	}
+}