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tomo-old/elements/switch.go

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package elements
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/textdraw"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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import "git.tebibyte.media/sashakoshka/tomo/default/theme"
import "git.tebibyte.media/sashakoshka/tomo/default/config"
// Switch is a toggle-able on/off switch with an optional label. It is
// functionally identical to Checkbox, but plays a different semantic role.
type Switch struct {
*core.Core
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*core.FocusableCore
core core.CoreControl
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focusableControl core.FocusableCoreControl
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drawer textdraw.Drawer
pressed bool
checked bool
text string
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config config.Wrapped
theme theme.Wrapped
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onToggle func ()
}
// NewSwitch creates a new switch with the specified label text.
func NewSwitch (text string, on bool) (element *Switch) {
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element = &Switch {
checked: on,
text: text,
}
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element.theme.Case = tomo.C("tomo", "switch")
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element.Core, element.core = core.NewCore(element, element.draw)
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element.FocusableCore,
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element.focusableControl = core.NewFocusableCore(element.core, element.redo)
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element.drawer.SetFace (element.theme.FontFace (
tomo.FontStyleRegular,
tomo.FontSizeNormal))
element.drawer.SetText([]rune(text))
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element.updateMinimumSize()
return
}
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func (element *Switch) HandleMouseDown (x, y int, button input.Button) {
if !element.Enabled() { return }
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element.Focus()
element.pressed = true
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element.redo()
}
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func (element *Switch) HandleMouseUp (x, y int, button input.Button) {
if button != input.ButtonLeft || !element.pressed { 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.DamageAll()
}
if within && element.onToggle != nil {
element.onToggle()
}
}
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func (element *Switch) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter {
element.pressed = true
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element.redo()
}
}
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func (element *Switch) HandleKeyUp (key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter && element.pressed {
element.pressed = false
element.checked = !element.checked
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element.redo()
if element.onToggle != nil {
element.onToggle()
}
}
}
// OnToggle sets the function to be called when the switch is flipped.
func (element *Switch) OnToggle (callback func ()) {
element.onToggle = callback
}
// Value reports whether or not the switch is currently on.
func (element *Switch) Value () (on bool) {
return element.checked
}
// SetEnabled sets whether this switch can be flipped or not.
func (element *Switch) SetEnabled (enabled bool) {
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element.focusableControl.SetEnabled(enabled)
}
// SetText sets the checkbox's label text.
func (element *Switch) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText([]rune(text))
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element.updateMinimumSize()
element.redo()
}
// SetTheme sets the element's theme.
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func (element *Switch) 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()
element.redo()
}
// SetConfig sets the element's configuration.
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func (element *Switch) SetConfig (new tomo.Config) {
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if new == element.config.Config { return }
element.config.Config = new
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element.updateMinimumSize()
element.redo()
}
func (element *Switch) redo () {
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
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func (element *Switch) updateMinimumSize () {
textBounds := element.drawer.LayoutBounds()
lineHeight := element.drawer.LineHeight().Round()
if element.text == "" {
element.core.SetMinimumSize(lineHeight * 2, lineHeight)
} else {
element.core.SetMinimumSize (
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lineHeight * 2 +
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element.theme.Margin(tomo.PatternBackground).X +
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textBounds.Dx(),
lineHeight)
}
}
func (element *Switch) draw () {
bounds := element.Bounds()
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handleBounds := image.Rect(0, 0, bounds.Dy(), bounds.Dy()).Add(bounds.Min)
gutterBounds := image.Rect(0, 0, bounds.Dy() * 2, bounds.Dy()).Add(bounds.Min)
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state := tomo.State {
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Disabled: !element.Enabled(),
Focused: element.Focused(),
Pressed: element.pressed,
}
element.core.DrawBackground (
element.theme.Pattern(tomo.PatternBackground, state))
if element.checked {
handleBounds.Min.X += bounds.Dy()
handleBounds.Max.X += bounds.Dy()
if element.pressed {
handleBounds.Min.X -= 2
handleBounds.Max.X -= 2
}
} else {
if element.pressed {
handleBounds.Min.X += 2
handleBounds.Max.X += 2
}
}
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gutterPattern := element.theme.Pattern (
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tomo.PatternGutter, state)
gutterPattern.Draw(element.core, gutterBounds)
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handlePattern := element.theme.Pattern (
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tomo.PatternHandle, state)
handlePattern.Draw(element.core, handleBounds)
textBounds := element.drawer.LayoutBounds()
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offset := bounds.Min.Add(image.Point {
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X: bounds.Dy() * 2 +
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element.theme.Margin(tomo.PatternBackground).X,
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})
offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
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foreground := element.theme.Color(tomo.ColorForeground, state)
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element.drawer.Draw(element.core, foreground, offset)
}