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tomo-old/elements/basic/checkbox.go
2023-01-17 16:46:07 -05:00

212 lines
5.0 KiB
Go

package basic
import "image"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
// Checkbox is a toggle-able checkbox with a label.
type Checkbox struct {
*core.Core
core core.CoreControl
pressed bool
checked bool
enabled bool
selected bool
onClick func ()
text string
drawer artist.TextDrawer
}
// NewCheckbox creates a new cbeckbox with the specified label text.
func NewCheckbox (text string, checked bool) (element *Checkbox) {
element = &Checkbox { enabled: true, checked: checked }
element.Core, element.core = core.NewCore(element)
element.drawer.SetFace(theme.FontFaceRegular())
element.SetText(text)
return
}
// Resize changes this element's size.
func (element *Checkbox) Resize (width, height int) {
element.core.AllocateCanvas(width, height)
element.draw()
}
func (element *Checkbox) HandleMouseDown (x, y int, button tomo.Button) {
element.Select()
element.pressed = true
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
}
func (element *Checkbox) HandleMouseUp (x, y int, button tomo.Button) {
if button != tomo.ButtonLeft { return }
element.pressed = false
within := image.Point { x, y }.
In(element.Bounds())
if within {
element.checked = !element.checked
}
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
if within && element.onClick != nil {
element.onClick()
}
}
func (element *Checkbox) HandleMouseMove (x, y int) { }
func (element *Checkbox) HandleScroll (x, y int, deltaX, deltaY float64) { }
func (element *Checkbox) HandleKeyDown (
key tomo.Key,
modifiers tomo.Modifiers,
repeated bool,
) {
if key == tomo.KeyEnter {
element.pressed = true
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
}
}
func (element *Checkbox) HandleKeyUp (key tomo.Key, modifiers tomo.Modifiers) {
if key == tomo.KeyEnter && element.pressed {
element.pressed = false
element.checked = !element.checked
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
if element.onClick != nil {
element.onClick()
}
}
}
// Selected returns whether or not this element is selected.
func (element *Checkbox) Selected () (selected bool) {
return element.selected
}
// Select requests that this element be selected.
func (element *Checkbox) Select () {
element.core.RequestSelection()
}
func (element *Checkbox) HandleSelection (
direction tomo.SelectionDirection,
) (
accepted bool,
) {
direction = direction.Canon()
if !element.enabled { return false }
if element.selected && direction != tomo.SelectionDirectionNeutral {
return false
}
element.selected = true
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
return true
}
func (element *Checkbox) HandleDeselection () {
element.selected = false
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
}
// OnClick sets the function to be called when the checkbox is toggled.
func (element *Checkbox) OnClick (callback func ()) {
element.onClick = callback
}
// Value reports whether or not the checkbox is currently checked.
func (element *Checkbox) Value () (checked bool) {
return element.checked
}
// SetEnabled sets whether this checkbox can be toggled or not.
func (element *Checkbox) SetEnabled (enabled bool) {
if element.enabled == enabled { return }
element.enabled = enabled
if element.core.HasImage () {
element.draw()
element.core.PushAll()
}
}
// SetText sets the checkbox's label text.
func (element *Checkbox) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText(text)
textBounds := element.drawer.LayoutBounds()
element.core.SetMinimumSize (
textBounds.Dy() + theme.Padding() + textBounds.Dx(),
textBounds.Dy())
if element.core.HasImage () {
element.draw()
element.core.PushAll()
}
}
func (element *Checkbox) draw () {
bounds := element.core.Bounds()
boxBounds := image.Rect(0, 0, bounds.Dy(), bounds.Dy())
artist.FillRectangle ( element.core, theme.BackgroundPattern(), bounds)
artist.FillRectangle (
element.core,
theme.ButtonPattern (
element.enabled,
element.Selected(),
element.pressed),
boxBounds)
innerBounds := bounds
innerBounds.Min.X += theme.Padding()
innerBounds.Min.Y += theme.Padding()
innerBounds.Max.X -= theme.Padding()
innerBounds.Max.Y -= theme.Padding()
textBounds := element.drawer.LayoutBounds()
offset := image.Point {
X: bounds.Dy() + theme.Padding(),
}
offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
foreground := theme.ForegroundPattern(element.enabled)
element.drawer.Draw(element.core, foreground, offset)
if element.checked {
checkBounds := boxBounds.Inset(4)
if element.pressed {
checkBounds = checkBounds.Add(theme.SinkOffsetVector())
}
artist.FillRectangle (
element.core,
theme.ForegroundPattern(element.enabled),
checkBounds)
}
}