This repository has been archived on 2023-08-08. You can view files and clone it, but cannot push or open issues or pull requests.
tomo-old/elements/file.go

218 lines
5.2 KiB
Go

package elements
import "time"
import "io/fs"
import "image"
import "tomo"
import "tomo/input"
import "art"
var fileCase = tomo.C("files", "file")
// File displays an interactive visual representation of a file within any
// file system.
type File struct {
entity tomo.Entity
lastClick time.Time
pressed bool
enabled bool
iconID tomo.Icon
filesystem fs.StatFS
location string
onChoose func ()
}
// NewFile creates a new file element. If within is nil, it will use the OS file
// system
func NewFile (
location string,
within fs.StatFS,
) (
element *File,
err error,
) {
element = &File { enabled: true }
element.entity = tomo.GetBackend().NewEntity(element)
err = element.SetLocation(location, within)
return
}
// Entity returns this element's entity.
func (element *File) Entity () tomo.Entity {
return element.entity
}
// Draw causes the element to draw to the specified destination canvas.
func (element *File) Draw (destination art.Canvas) {
// background
state := element.state()
bounds := element.entity.Bounds()
sink := element.entity.Theme().Sink(tomo.PatternButton, fileCase)
element.entity.Theme().
Pattern(tomo.PatternButton, state, fileCase).
Draw(destination, bounds)
// icon
icon := element.icon()
if icon != nil {
iconBounds := icon.Bounds()
offset := image.Pt (
(bounds.Dx() - iconBounds.Dx()) / 2,
(bounds.Dy() - iconBounds.Dy()) / 2)
if element.pressed {
offset = offset.Add(sink)
}
icon.Draw (
destination,
element.entity.Theme().Color(tomo.ColorForeground, state, fileCase),
bounds.Min.Add(offset))
}
}
// Location returns the file's location and filesystem.
func (element *File) Location () (string, fs.StatFS) {
return element.location, element.filesystem
}
// SetLocation sets the file's location and filesystem. If within is nil, it
// will use the OS file system.
func (element *File) SetLocation (
location string,
within fs.StatFS,
) error {
if within == nil {
within = defaultFS { }
}
element.location = location
element.filesystem = within
return element.Update()
}
// Update refreshes the element to match the file it represents.
func (element *File) Update () error {
info, err := element.filesystem.Stat(element.location)
if err != nil {
element.iconID = tomo.IconError
} else if info.IsDir() {
element.iconID = tomo.IconDirectory
} else {
// TODO: choose icon based on file mime type
element.iconID = tomo.IconFile
}
element.updateMinimumSize()
element.entity.Invalidate()
return err
}
func (element *File) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
if !element.Enabled() { return }
if key == input.KeyEnter {
element.pressed = true
element.entity.Invalidate()
}
}
func (element *File) HandleKeyUp (key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter && element.pressed {
element.pressed = false
if !element.Enabled() { return }
element.entity.Invalidate()
if element.onChoose != nil {
element.onChoose()
}
}
}
func (element *File) HandleFocusChange () {
element.entity.Invalidate()
}
func (element *File) HandleSelectionChange () {
element.entity.Invalidate()
}
func (element *File) OnChoose (callback func ()) {
element.onChoose = callback
}
// Focus gives this element input focus.
func (element *File) Focus () {
if !element.entity.Focused() { element.entity.Focus() }
}
// Enabled returns whether this file is enabled or not.
func (element *File) Enabled () bool {
return element.enabled
}
// SetEnabled sets whether this file is enabled or not.
func (element *File) SetEnabled (enabled bool) {
if element.enabled == enabled { return }
element.enabled = enabled
element.entity.Invalidate()
}
func (element *File) HandleMouseDown (
position image.Point,
button input.Button,
modifiers input.Modifiers,
) {
if !element.Enabled() { return }
if !element.entity.Focused() { element.Focus() }
if button != input.ButtonLeft { return }
element.pressed = true
element.entity.Invalidate()
}
func (element *File) HandleMouseUp (
position image.Point,
button input.Button,
modifiers input.Modifiers,
) {
if button != input.ButtonLeft { return }
element.pressed = false
within := position.In(element.entity.Bounds())
if time.Since(element.lastClick) < element.entity.Config().DoubleClickDelay() {
if element.Enabled() && within && element.onChoose != nil {
element.onChoose()
}
} else {
element.lastClick = time.Now()
}
element.entity.Invalidate()
}
func (element *File) HandleThemeChange () {
element.updateMinimumSize()
element.entity.Invalidate()
}
func (element *File) state () tomo.State {
return tomo.State {
Disabled: !element.Enabled(),
Focused: element.entity.Focused(),
Pressed: element.pressed,
On: element.entity.Selected(),
}
}
func (element *File) icon () art.Icon {
return element.entity.Theme().Icon(element.iconID, tomo.IconSizeLarge, fileCase)
}
func (element *File) updateMinimumSize () {
padding := element.entity.Theme().Padding(tomo.PatternButton, fileCase)
icon := element.icon()
if icon == nil {
element.entity.SetMinimumSize (
padding.Horizontal(),
padding.Vertical())
} else {
bounds := padding.Inverse().Apply(icon.Bounds())
element.entity.SetMinimumSize(bounds.Dx(), bounds.Dy())
}
}