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tomo-old/elements/basic/switch.go

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package basicElements
import "image"
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import "git.tebibyte.media/sashakoshka/tomo/input"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
var switchCase = theme.C("basic", "switch")
// 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
drawer artist.TextDrawer
pressed bool
checked bool
text string
onToggle func ()
}
// NewSwitch creates a new switch with the specified label text.
func NewSwitch (text string, on bool) (element *Switch) {
element = &Switch { checked: on, text: text }
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element.Core, element.core = core.NewCore(element.draw)
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element.FocusableCore,
element.focusableControl = core.NewFocusableCore (func () {
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
})
element.drawer.SetFace(theme.FontFaceRegular())
element.drawer.SetText([]rune(text))
element.calculateMinimumSize()
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
if element.core.HasImage() {
element.draw()
element.core.DamageAll()
}
}
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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()
}
}
func (element *Switch) HandleMouseMove (x, y int) { }
func (element *Switch) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }
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func (element *Switch) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter {
element.pressed = true
if element.core.HasImage() {
element.draw()
element.core.DamageAll()
}
}
}
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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
if element.core.HasImage() {
element.draw()
element.core.DamageAll()
}
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))
element.calculateMinimumSize()
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
func (element *Switch) calculateMinimumSize () {
textBounds := element.drawer.LayoutBounds()
lineHeight := element.drawer.LineHeight().Round()
if element.text == "" {
element.core.SetMinimumSize(lineHeight * 2, lineHeight)
} else {
element.core.SetMinimumSize (
lineHeight * 2 + theme.Padding() + 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)
backgroundPattern, _ := theme.BackgroundPattern(theme.PatternState {
Case: switchCase,
})
artist.FillRectangle (element, backgroundPattern, bounds)
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
}
}
gutterPattern, _ := theme.GutterPattern(theme.PatternState {
Case: switchCase,
Disabled: !element.Enabled(),
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Focused: element.Focused(),
Pressed: element.pressed,
})
artist.FillRectangle(element, gutterPattern, gutterBounds)
handlePattern, _ := theme.HandlePattern(theme.PatternState {
Case: switchCase,
Disabled: !element.Enabled(),
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Focused: element.Focused(),
Pressed: element.pressed,
})
artist.FillRectangle(element, handlePattern, handleBounds)
textBounds := element.drawer.LayoutBounds()
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offset := bounds.Min.Add(image.Point {
X: bounds.Dy() * 2 + theme.Padding(),
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})
offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
foreground, _ := theme.ForegroundPattern (theme.PatternState {
Case: switchCase,
Disabled: !element.Enabled(),
})
element.drawer.Draw(element, foreground, offset)
}