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tomo-old/elements/basic/slider.go

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package basicElements
import "image"
import "git.tebibyte.media/sashakoshka/tomo/input"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/config"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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// Slider is a slider control with a floating point value between zero and one.
type Slider struct {
*core.Core
*core.FocusableCore
core core.CoreControl
focusableControl core.FocusableCoreControl
value float64
vertical bool
dragging bool
dragOffset int
track image.Rectangle
bar image.Rectangle
config config.Wrapped
theme theme.Wrapped
onSlide func ()
onRelease func ()
}
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// NewSlider creates a new slider with the specified value. If vertical is set
// to true,
func NewSlider (value float64, vertical bool) (element *Slider) {
element = &Slider {
value: value,
vertical: vertical,
}
if vertical {
element.theme.Case = theme.C("basic", "sliderVertical")
} else {
element.theme.Case = theme.C("basic", "sliderHorizontal")
}
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element.Core, element.core = core.NewCore(element, element.draw)
element.FocusableCore,
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element.focusableControl = core.NewFocusableCore(element.core, element.redo)
element.updateMinimumSize()
return
}
func (element *Slider) HandleMouseDown (x, y int, button input.Button) {
if !element.Enabled() { return }
element.Focus()
if button == input.ButtonLeft {
element.dragging = true
element.value = element.valueFor(x, y)
if element.onSlide != nil {
element.onSlide()
}
element.redo()
}
}
func (element *Slider) HandleMouseUp (x, y int, button input.Button) {
if button != input.ButtonLeft || !element.dragging { return }
element.dragging = false
if element.onRelease != nil {
element.onRelease()
}
element.redo()
}
func (element *Slider) HandleMotion (x, y int) {
if element.dragging {
element.dragging = true
element.value = element.valueFor(x, y)
if element.onSlide != nil {
element.onSlide()
}
element.redo()
}
}
func (element *Slider) HandleScroll (x, y int, deltaX, deltaY float64) { }
func (element *Slider) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
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switch key {
case input.KeyUp:
element.changeValue(0.1)
case input.KeyDown:
element.changeValue(-0.1)
case input.KeyRight:
if element.vertical {
element.changeValue(-0.1)
} else {
element.changeValue(0.1)
}
case input.KeyLeft:
if element.vertical {
element.changeValue(0.1)
} else {
element.changeValue(-0.1)
}
}
}
func (element *Slider) HandleKeyUp (key input.Key, modifiers input.Modifiers) { }
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// Value returns the slider's value.
func (element *Slider) Value () (value float64) {
return element.value
}
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// SetEnabled sets whether or not the slider can be interacted with.
func (element *Slider) SetEnabled (enabled bool) {
element.focusableControl.SetEnabled(enabled)
}
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// SetValue sets the slider's value.
func (element *Slider) SetValue (value float64) {
if value < 0 { value = 0 }
if value > 1 { value = 1 }
if element.value == value { return }
element.value = value
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if element.onRelease != nil {
element.onRelease()
}
element.redo()
}
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// OnSlide sets a function to be called every time the slider handle changes
// position while being dragged.
func (element *Slider) OnSlide (callback func ()) {
element.onSlide = callback
}
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// OnRelease sets a function to be called when the handle stops being dragged.
func (element *Slider) OnRelease (callback func ()) {
element.onRelease = callback
}
// SetTheme sets the element's theme.
func (element *Slider) SetTheme (new theme.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
element.redo()
}
// SetConfig sets the element's configuration.
func (element *Slider) SetConfig (new config.Config) {
if new == element.config.Config { return }
element.config.Config = new
element.updateMinimumSize()
element.redo()
}
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func (element *Slider) changeValue (delta float64) {
element.value += delta
if element.value < 0 {
element.value = 0
}
if element.value > 1 {
element.value = 1
}
if element.onRelease != nil {
element.onRelease()
}
element.redo()
}
func (element *Slider) valueFor (x, y int) (value float64) {
if element.vertical {
value =
float64(y - element.track.Min.Y - element.bar.Dy() / 2) /
float64(element.track.Dy() - element.bar.Dy())
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value = 1 - value
} else {
value =
float64(x - element.track.Min.X - element.bar.Dx() / 2) /
float64(element.track.Dx() - element.bar.Dx())
}
if value < 0 { value = 0 }
if value > 1 { value = 1 }
return
}
func (element *Slider) updateMinimumSize () {
if element.vertical {
element.core.SetMinimumSize (
element.config.HandleWidth(),
element.config.HandleWidth() * 2)
} else {
element.core.SetMinimumSize (
element.config.HandleWidth() * 2,
element.config.HandleWidth())
}
}
func (element *Slider) redo () {
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
func (element *Slider) draw () {
bounds := element.Bounds()
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element.track = element.theme.Padding(theme.PatternGutter).Apply(bounds)
if element.vertical {
barSize := element.track.Dx()
element.bar = image.Rect(0, 0, barSize, barSize).Add(bounds.Min)
barOffset :=
float64(element.track.Dy() - barSize) *
(1 - element.value)
element.bar = element.bar.Add(image.Pt(0, int(barOffset)))
} else {
barSize := element.track.Dy()
element.bar = image.Rect(0, 0, barSize, barSize).Add(bounds.Min)
barOffset :=
float64(element.track.Dx() - barSize) *
element.value
element.bar = element.bar.Add(image.Pt(int(barOffset), 0))
}
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state := theme.State {
Focused: element.Focused(),
Disabled: !element.Enabled(),
Pressed: element.dragging,
}
element.theme.Pattern(theme.PatternGutter, state).Draw (
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element.core,
bounds)
element.theme.Pattern(theme.PatternHandle, state).Draw (
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element.core,
element.bar)
}