rchargel / hdfs-explorer

import (

	"image/color"

	"fyne.io/fyne/v2"

	"fyne.io/fyne/v2/canvas"

	"fyne.io/fyne/v2/container"

	"fyne.io/fyne/v2/data/binding"

	"fyne.io/fyne/v2/driver/desktop"

	"fyne.io/fyne/v2/layout"

	"fyne.io/fyne/v2/theme"

	"fyne.io/fyne/v2/widget"

	"github.com/rchargel/hdfs-explorer/files"

)

var sizes [7]float32 = [7]float32{}

var _ fyne.Widget = (*fileDirectoryRow)(nil)

var _ fyne.Tappable = (*fileDirectoryRow)(nil)

var _ fyne.DoubleTappable = (*fileDirectoryRow)(nil)

var _ desktop.Hoverable = (*fileDirectoryRow)(nil)

type FileDirectoryList struct {

	container *fyne.Container

}

func NewFileDirectoryList(data HdfsFileInfoList, openItem func(string)) *FileDirectoryList {

	list := &FileDirectoryList{

		container: container.New(layout.NewVBoxLayout()),

	}

	data.AddListener(binding.NewDataListener(func() {

		infos, _ := data.Get()

		objects := make([]fyne.CanvasObject, len(infos))

		for i, info := range infos {

			objects[i] = newFileDirectoryRow(info, list.deselectAll, openItem)

		}

		list.container.Objects = objects

		list.container.Refresh()

	}))

	return list

}

func (f *FileDirectoryList) deselectAll(name string) {

	for _, obj := range f.container.Objects {

		if obj.(*fileDirectoryRow).info.Name() != name {

			obj.(*fileDirectoryRow).selected = false

			obj.Refresh()

		}

	}

}

type fileDirectoryRow struct {

	widget.BaseWidget

	info  files.HdfsFileInfo

	child fyne.CanvasObject

	mode  *canvas.Text

	owner *canvas.Text

	group *canvas.Text

	size  *canvas.Text

	block *canvas.Text

	time  *canvas.Text

	name  *canvas.Text

	selected, hovered bool

	onTapped          func(name string)

	onDoubleTapped    func(name string)

}

type fileDirectoryRowRenderer struct {

	objects []fyne.CanvasObject

	row *fileDirectoryRow

}

func newFileDirectoryRow(info files.HdfsFileInfo, onTapped, onDoubleTapped func(name string)) *fileDirectoryRow {

	mode := newText(info.Mode().String(), fyne.TextAlignLeading)

	owner := newText(info.Owner(), fyne.TextAlignLeading)

	group := newText(info.OwnerGroup(), fyne.TextAlignLeading)

	size := newText(files.FormatBytes(uint64(info.Size())), fyne.TextAlignTrailing)

	block := newText(files.FormatBytes(info.BlockSize()), fyne.TextAlignTrailing)

	time := newText(info.ModTime().Format("Jan 02 15:04"), fyne.TextAlignLeading)

	name := newText(info.Name(), fyne.TextAlignLeading)

	r := &fileDirectoryRow{

		BaseWidget:     widget.BaseWidget{},

		info:           info,

		mode:           mode,

		owner:          owner,

		group:          group,

		size:           size,

		block:          block,

		time:           time,

		name:           name,

		onTapped:       onTapped,

		onDoubleTapped: onDoubleTapped,

		child: container.New(

			layout.NewGridLayoutWithColumns(7),

			mode, owner, group, size, block, time, name,

		),

	}

	r.ExtendBaseWidget(r)

	return r

}

func (r *fileDirectoryRow) setStyle(style fyne.TextStyle) {

	objects := r.child.(*fyne.Container).Objects

	for _, obj := range objects {

		obj.(*canvas.Text).TextStyle = style

	}

}

func (r *fileDirectoryRow) setColor(color color.Color) {

	objects := r.child.(*fyne.Container).Objects

	for _, obj := range objects {

		obj.(*canvas.Text).Color = color

	}

}

func (r *fileDirectoryRow) MinSize() fyne.Size {

	r.ExtendBaseWidget(r)

	return r.BaseWidget.MinSize()

}

func (r *fileDirectoryRow) Tapped(*fyne.PointEvent) {

	r.selected = !r.selected

	r.onTapped(r.info.Name())

	r.Refresh()

}

func (r *fileDirectoryRow) DoubleTapped(*fyne.PointEvent) {

	r.onDoubleTapped(r.info.Name())

}

func (r *fileDirectoryRow) MouseIn(*desktop.MouseEvent) {

	r.hovered = true

	r.Refresh()

}

func (r *fileDirectoryRow) MouseOut() {

	r.hovered = false

	r.Refresh()

}

func newText(text string, alignment fyne.TextAlign) *canvas.Text {

	return &canvas.Text{

		Text:      text,

		Alignment: alignment,

		Color:     theme.ForegroundColor(),

		TextStyle: fyne.TextStyle{Monospace: true},

		TextSize:  fyne.CurrentApp().Settings().Theme().Size("text") * float32(0.9),

	}

}

func (r *fileDirectoryRow) CreateRenderer() fyne.WidgetRenderer {

	r.ExtendBaseWidget(r)

	objects := []fyne.CanvasObject{r.child}

	return &fileDirectoryRowRenderer{objects, r}

}

func (r *fileDirectoryRowRenderer) Destroy() {

	// nothing done here

}

func (r *fileDirectoryRowRenderer) Objects() []fyne.CanvasObject {

	return r.objects

}

func (r *fileDirectoryRowRenderer) SetObjects(objects []fyne.CanvasObject) {

	r.objects = objects

}

func (r *fileDirectoryRowRenderer) MinSize() fyne.Size {

	objects := r.row.child.(*fyne.Container).Objects

	height := r.row.child.MinSize().Height

	for i, o := range objects {

		sizes[i] = max(sizes[i], o.MinSize().Width)

	}

	return fyne.NewSize(minWidth(), height+theme.Padding()*2)

}

func (r *fileDirectoryRowRenderer) Layout(size fyne.Size) {

	r.row.child.Move(fyne.NewPos(theme.Padding(), theme.Padding()))

	r.row.child.Resize(fyne.NewSize(size.Width+theme.Padding()*2, size.Height+theme.Padding()*2))

	x := theme.Padding()

	for i, obj := range r.row.child.(*fyne.Container).Objects {

		width := sizes[i]

		obj.Resize(fyne.NewSize(width, obj.MinSize().Height))

		obj.Move(fyne.NewPos(x, theme.Padding()))

		x += width + theme.Padding()

	}

}

func (r *fileDirectoryRowRenderer) Refresh() {

	if r.row.hovered {

		r.row.setColor(theme.PrimaryColor())

	} else {

		r.row.setColor(theme.ForegroundColor())

	}

	canvas.Refresh(r.row)

}

func minWidth() float32 {

	width := float32(0)

	for _, w := range sizes {

		width += w + theme.Padding()*2

	}

	return width

}

func max(a, b float32) float32 {

	if a > b {

		return a

	}

	return b

}