main.go

package main

import (
	"fmt"
	"runtime"
	"time"

	"fyne.io/cloud"
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/driver/desktop"
	"fyne.io/fyne/v2/layout"
	"fyne.io/fyne/v2/theme"
	"fyne.io/fyne/v2/widget"
)

type ui struct {
	current *note
	notes   *notelist

	content *widget.Entry
	list    *widget.List
}

func (u *ui) addNote() {
	newNote := u.notes.add()
	u.setNote(newNote)
}

func (u *ui) setNote(n *note) {
	u.content.Unbind()
	if n == nil {
		u.content.SetText(u.placeholderContent())
		return
	}
	u.current = n
	u.content.Bind(n.content)
	u.content.Validator = nil
	u.list.Refresh()
}

func (u *ui) buildList() *widget.List {
	l := widget.NewList(
		func() int {
			return len(u.notes.notes())
		},
		func() fyne.CanvasObject {
			return widget.NewLabel("Title")
		},
		func(id widget.ListItemID, obj fyne.CanvasObject) {
			l := obj.(*widget.Label)
			n := u.notes.notes()[id]
			l.Bind(n.title())
		})

	l.OnSelected = func(id widget.ListItemID) {
		n := u.notes.notes()[id]
		u.setNote(n)
	}

	return l
}

func (u *ui) removeCurrentNote() {
	u.notes.delete(u.current)
	visible := u.notes.notes()
	if len(visible) > 0 {
		u.setNote(visible[0])
	} else {
		u.setNote(nil)
	}
	u.list.Refresh()
}

func (u *ui) loadUI() fyne.CanvasObject {
	u.content = widget.NewMultiLineEntry()
	u.content.SetText(u.placeholderContent())
	time.Sleep(time.Millisecond * 100) // de-bounce Entry? #4235
	u.list = u.buildList()

	visible := u.notes.notes()
	if len(visible) > 0 {
		u.setNote(visible[0])
		u.list.Select(0)
	}

	bar := widget.NewToolbar(
		widget.NewToolbarAction(theme.ContentAddIcon(), func() {
			u.addNote()
		}),
		widget.NewToolbarAction(theme.ContentRemoveIcon(), func() {
			u.removeCurrentNote()
		}),
	)
	if fyne.CurrentDevice().IsMobile() {
		// a mock button to leave space for the mobile menu
		bar.Items = append([]widget.ToolbarItem{widget.NewToolbarAction(theme.MenuIcon(), func() {})}, bar.Items...)
	}

	side := fyne.NewContainerWithLayout(layout.NewBorderLayout(bar, nil, nil, nil),
		bar, container.NewVScroll(u.list))

	return newAdaptiveSplit(side, u.content)
}

func (u *ui) registerKeys(w fyne.Window) {
	shortcut := &desktop.CustomShortcut{KeyName: fyne.KeyN, Modifier: desktop.ControlModifier}
	if runtime.GOOS == "darwin" {
		shortcut.Modifier = desktop.SuperModifier
	}

	w.Canvas().AddShortcut(shortcut, func(_ fyne.Shortcut) {
		u.addNote()
	})
}

func (u *ui) placeholderContent() string {
	text := "Welcome!\nTap '+' in the toolbar to add a note."
	if fyne.CurrentDevice().HasKeyboard() {
		modifier := "ctrl"
		if runtime.GOOS == "darwin" {
			modifier = "cmd"
		}
		text += fmt.Sprintf("\n\nOr use the keyboard shortcut %s+N.", modifier)
	}
	return text
}

func main() {
	a := app.NewWithID("com.fynelabs.notes")
	cloud.Enable(a)
	a.SetIcon(resourceIconPng)
	a.Settings().SetTheme(&myTheme{})
	w := a.NewWindow("Fyne Notes")

	w.SetMainMenu(fyne.NewMainMenu(
		fyne.NewMenu("File",
			fyne.NewMenuItem("Sync...", func() {
				cloud.ShowSettings(a, w)
			}))))

	list := &notelist{pref: a.Preferences()}
	list.load()
	notesUI := &ui{notes: list}

	w.SetContent(notesUI.loadUI())
	notesUI.registerKeys(w)

	w.Resize(fyne.NewSize(500, 320))
	w.ShowAndRun()
}