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tomo-old/elements/checkbox.go

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package elements
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo"
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import "git.tebibyte.media/sashakoshka/tomo/input"
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import "git.tebibyte.media/sashakoshka/tomo/canvas"
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import "git.tebibyte.media/sashakoshka/tomo/textdraw"
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import "git.tebibyte.media/sashakoshka/tomo/default/theme"
import "git.tebibyte.media/sashakoshka/tomo/default/config"
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// Checkbox is a toggle-able checkbox with a label.
type Checkbox struct {
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entity tomo.FocusableEntity
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drawer textdraw.Drawer
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enabled bool
pressed bool
checked bool
text string
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config config.Wrapped
theme theme.Wrapped
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onToggle func ()
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}
// NewCheckbox creates a new cbeckbox with the specified label text.
func NewCheckbox (text string, checked bool) (element *Checkbox) {
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element = &Checkbox { checked: checked, enabled: true }
element.entity = tomo.NewEntity(element).(tomo.FocusableEntity)
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element.theme.Case = tomo.C("tomo", "checkbox")
element.drawer.SetFace (element.theme.FontFace (
tomo.FontStyleRegular,
tomo.FontSizeNormal))
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element.SetText(text)
return
}
// Entity returns this element's entity.
func (element *Checkbox) Entity () tomo.Entity {
return element.entity
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}
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// Draw causes the element to draw to the specified destination canvas.
func (element *Checkbox) Draw (destination canvas.Canvas) {
bounds := element.entity.Bounds()
boxBounds := image.Rect(0, 0, bounds.Dy(), bounds.Dy()).Add(bounds.Min)
state := tomo.State {
Disabled: !element.Enabled(),
Focused: element.entity.Focused(),
Pressed: element.pressed,
On: element.checked,
}
element.entity.DrawBackground(destination)
pattern := element.theme.Pattern(tomo.PatternButton, state)
pattern.Draw(destination, boxBounds)
textBounds := element.drawer.LayoutBounds()
margin := element.theme.Margin(tomo.PatternBackground)
offset := bounds.Min.Add(image.Point {
X: bounds.Dy() + margin.X,
})
offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
foreground := element.theme.Color(tomo.ColorForeground, state)
element.drawer.Draw(destination, foreground, offset)
}
// OnToggle sets the function to be called when the checkbox is toggled.
func (element *Checkbox) OnToggle (callback func ()) {
element.onToggle = callback
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}
// Value reports whether or not the checkbox is currently checked.
func (element *Checkbox) Value () (checked bool) {
return element.checked
}
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// Focus gives this element input focus.
func (element *Checkbox) Focus () {
if !element.entity.Focused() { element.entity.Focus() }
}
// Enabled returns whether this checkbox is enabled or not.
func (element *Checkbox) Enabled () bool {
return element.enabled
}
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// SetEnabled sets whether this checkbox can be toggled or not.
func (element *Checkbox) SetEnabled (enabled bool) {
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if element.enabled == enabled { return }
element.enabled = enabled
element.entity.Invalidate()
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}
// SetText sets the checkbox's label text.
func (element *Checkbox) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText([]rune(text))
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element.updateMinimumSize()
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element.entity.Invalidate()
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}
// SetTheme sets the element's theme.
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func (element *Checkbox) SetTheme (new tomo.Theme) {
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if new == element.theme.Theme { return }
element.theme.Theme = new
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element.drawer.SetFace (element.theme.FontFace (
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tomo.FontStyleRegular,
tomo.FontSizeNormal))
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element.updateMinimumSize()
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element.entity.Invalidate()
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}
// SetConfig sets the element's configuration.
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func (element *Checkbox) SetConfig (new tomo.Config) {
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if new == element.config.Config { return }
element.config.Config = new
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element.updateMinimumSize()
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element.entity.Invalidate()
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}
func (element *Checkbox) HandleFocusChange () {
element.entity.Invalidate()
}
func (element *Checkbox) HandleMouseDown (
position image.Point,
button input.Button,
modifiers input.Modifiers,
) {
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if !element.Enabled() { return }
element.Focus()
element.pressed = true
element.entity.Invalidate()
}
func (element *Checkbox) HandleMouseUp (
position image.Point,
button input.Button,
modifiers input.Modifiers,
) {
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if button != input.ButtonLeft || !element.pressed { return }
element.pressed = false
within := position.In(element.entity.Bounds())
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if within {
element.checked = !element.checked
}
element.entity.Invalidate()
if within && element.onToggle != nil {
element.onToggle()
}
}
func (element *Checkbox) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter {
element.pressed = true
element.entity.Invalidate()
}
}
func (element *Checkbox) HandleKeyUp (key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter && element.pressed {
element.pressed = false
element.checked = !element.checked
element.entity.Invalidate()
if element.onToggle != nil {
element.onToggle()
}
}
}
func (element *Checkbox) updateMinimumSize () {
textBounds := element.drawer.LayoutBounds()
if element.text == "" {
element.entity.SetMinimumSize(textBounds.Dy(), textBounds.Dy())
} else {
margin := element.theme.Margin(tomo.PatternBackground)
element.entity.SetMinimumSize (
textBounds.Dy() + margin.X + textBounds.Dx(),
textBounds.Dy())
}
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}