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tomo-old/elements/togglebutton.go
2023-04-20 18:40:05 -04:00

280 lines
7.3 KiB
Go

package elements
import "image"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/input"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
import "git.tebibyte.media/sashakoshka/tomo/default/theme"
import "git.tebibyte.media/sashakoshka/tomo/default/config"
import "git.tebibyte.media/sashakoshka/tomo/textdraw"
// ToggleButton is a togglable button.
type ToggleButton struct {
entity tomo.FocusableEntity
drawer textdraw.Drawer
enabled bool
pressed bool
on bool
text string
config config.Wrapped
theme theme.Wrapped
showText bool
hasIcon bool
iconId tomo.Icon
onToggle func ()
}
// NewToggleButton creates a new toggle button with the specified label text.
func NewToggleButton (text string, on bool) (element *ToggleButton) {
element = &ToggleButton {
showText: true,
enabled: true,
on: on,
}
element.entity = tomo.NewEntity(element).(tomo.FocusableEntity)
element.theme.Case = tomo.C("tomo", "toggleButton")
element.drawer.SetFace (element.theme.FontFace (
tomo.FontStyleRegular,
tomo.FontSizeNormal))
element.SetText(text)
return
}
// Entity returns this element's entity.
func (element *ToggleButton) Entity () tomo.Entity {
return element.entity
}
// Draw causes the element to draw to the specified destination canvas.
func (element *ToggleButton) Draw (destination canvas.Canvas) {
state := element.state()
bounds := element.entity.Bounds()
pattern := element.theme.Pattern(tomo.PatternButton, state)
lampPattern := element.theme.Pattern(tomo.PatternLamp, state)
lampPadding := element.theme.Padding(tomo.PatternLamp).Horizontal()
lampBounds := bounds
lampBounds.Max.X = lampBounds.Min.X + lampPadding
bounds.Min.X += lampPadding
pattern.Draw(destination, bounds)
lampPattern.Draw(destination, lampBounds)
foreground := element.theme.Color(tomo.ColorForeground, state)
sink := element.theme.Sink(tomo.PatternButton)
margin := element.theme.Margin(tomo.PatternButton)
offset := image.Pt (
bounds.Dx() / 2,
bounds.Dy() / 2).Add(bounds.Min)
if element.showText {
textBounds := element.drawer.LayoutBounds()
offset.X -= textBounds.Dx() / 2
offset.Y -= textBounds.Dy() / 2
offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
}
if element.hasIcon {
icon := element.theme.Icon(element.iconId, tomo.IconSizeSmall)
if icon != nil {
iconBounds := icon.Bounds()
addedWidth := iconBounds.Dx()
iconOffset := offset
if element.showText {
addedWidth += margin.X
}
iconOffset.X -= addedWidth / 2
iconOffset.Y =
bounds.Min.Y +
(bounds.Dy() -
iconBounds.Dy()) / 2
if element.pressed {
iconOffset = iconOffset.Add(sink)
}
offset.X += addedWidth / 2
icon.Draw(destination, foreground, iconOffset)
}
}
if element.showText {
if element.pressed {
offset = offset.Add(sink)
}
element.drawer.Draw(destination, foreground, offset)
}
}
// OnToggle sets the function to be called when the button is toggled.
func (element *ToggleButton) OnToggle (callback func ()) {
element.onToggle = callback
}
// Value reports whether or not the button is currently on.
func (element *ToggleButton) Value () (on bool) {
return element.on
}
// Focus gives this element input focus.
func (element *ToggleButton) Focus () {
if !element.entity.Focused() { element.entity.Focus() }
}
// Enabled returns whether this button is enabled or not.
func (element *ToggleButton) Enabled () bool {
return element.enabled
}
// SetEnabled sets whether this button can be toggled or not.
func (element *ToggleButton) SetEnabled (enabled bool) {
if element.enabled == enabled { return }
element.enabled = enabled
element.entity.Invalidate()
}
// SetText sets the button's label text.
func (element *ToggleButton) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText([]rune(text))
element.updateMinimumSize()
element.entity.Invalidate()
}
// SetIcon sets the icon of the button. Passing theme.IconNone removes the
// current icon if it exists.
func (element *ToggleButton) SetIcon (id tomo.Icon) {
if id == tomo.IconNone {
element.hasIcon = false
} else {
if element.hasIcon && element.iconId == id { return }
element.hasIcon = true
element.iconId = id
}
element.updateMinimumSize()
element.entity.Invalidate()
}
// ShowText sets whether or not the button's text will be displayed.
func (element *ToggleButton) ShowText (showText bool) {
if element.showText == showText { return }
element.showText = showText
element.updateMinimumSize()
element.entity.Invalidate()
}
// SetTheme sets the element's theme.
func (element *ToggleButton) SetTheme (new tomo.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
element.drawer.SetFace (element.theme.FontFace (
tomo.FontStyleRegular,
tomo.FontSizeNormal))
element.updateMinimumSize()
element.entity.Invalidate()
}
// SetConfig sets the element's configuration.
func (element *ToggleButton) SetConfig (new tomo.Config) {
if new == element.config.Config { return }
element.config.Config = new
element.updateMinimumSize()
element.entity.Invalidate()
}
func (element *ToggleButton) HandleFocusChange () {
element.entity.Invalidate()
}
func (element *ToggleButton) HandleMouseDown (
position image.Point,
button input.Button,
modifiers input.Modifiers,
) {
if !element.Enabled() { return }
element.Focus()
if button != input.ButtonLeft { return }
element.pressed = true
element.entity.Invalidate()
}
func (element *ToggleButton) HandleMouseUp (
position image.Point,
button input.Button,
modifiers input.Modifiers,
) {
if button != input.ButtonLeft { return }
element.pressed = false
within := position.In(element.entity.Bounds())
if element.Enabled() && within {
element.on = !element.on
if element.onToggle != nil {
element.onToggle()
}
}
element.entity.Invalidate()
}
func (element *ToggleButton) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
if !element.Enabled() { return }
if key == input.KeyEnter {
element.pressed = true
element.entity.Invalidate()
}
}
func (element *ToggleButton) HandleKeyUp(key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter && element.pressed {
element.pressed = false
element.entity.Invalidate()
if !element.Enabled() { return }
element.on = !element.on
if element.onToggle != nil {
element.onToggle()
}
}
}
func (element *ToggleButton) updateMinimumSize () {
padding := element.theme.Padding(tomo.PatternButton)
margin := element.theme.Margin(tomo.PatternButton)
lampPadding := element.theme.Padding(tomo.PatternLamp)
textBounds := element.drawer.LayoutBounds()
minimumSize := textBounds.Sub(textBounds.Min)
if element.hasIcon {
icon := element.theme.Icon(element.iconId, tomo.IconSizeSmall)
if icon != nil {
bounds := icon.Bounds()
if element.showText {
minimumSize.Max.X += bounds.Dx()
minimumSize.Max.X += margin.X
} else {
minimumSize.Max.X = bounds.Dx()
}
}
}
minimumSize.Max.X += lampPadding.Horizontal()
minimumSize = padding.Inverse().Apply(minimumSize)
element.entity.SetMinimumSize(minimumSize.Dx(), minimumSize.Dy())
}
func (element *ToggleButton) state () tomo.State {
return tomo.State {
Disabled: !element.Enabled(),
Focused: element.entity.Focused(),
Pressed: element.pressed,
On: element.on,
}
}