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tomo-old/elements/basic/button.go

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package basicElements
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import "image"
// import "runtime/debug"
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import "git.tebibyte.media/sashakoshka/tomo/input"
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import "git.tebibyte.media/sashakoshka/tomo/theme"
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import "git.tebibyte.media/sashakoshka/tomo/config"
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import "git.tebibyte.media/sashakoshka/tomo/artist"
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import "git.tebibyte.media/sashakoshka/tomo/shatter"
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import "git.tebibyte.media/sashakoshka/tomo/textdraw"
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import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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// Button is a clickable button.
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type Button struct {
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*core.Core
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*core.FocusableCore
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core core.CoreControl
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focusableControl core.FocusableCoreControl
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drawer textdraw.Drawer
pressed bool
text string
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config config.Wrapped
theme theme.Wrapped
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onClick func ()
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}
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// NewButton creates a new button with the specified label text.
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func NewButton (text string) (element *Button) {
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element = &Button { }
element.theme.Case = theme.C("basic", "button")
element.Core, element.core = core.NewCore(element.drawAll)
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element.FocusableCore,
element.focusableControl = core.NewFocusableCore (func () {
element.drawAndPush(true)
})
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element.SetText(text)
return
}
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func (element *Button) HandleMouseDown (x, y int, button input.Button) {
if !element.Enabled() { return }
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if !element.Focused() { element.Focus() }
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if button != input.ButtonLeft { return }
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element.pressed = true
element.drawAndPush(true)
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}
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func (element *Button) HandleMouseUp (x, y int, button input.Button) {
if button != input.ButtonLeft { return }
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element.pressed = false
within := image.Point { x, y }.
In(element.Bounds())
if element.Enabled() && within && element.onClick != nil {
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element.onClick()
}
element.drawAndPush(true)
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}
func (element *Button) HandleMouseMove (x, y int) { }
func (element *Button) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }
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func (element *Button) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
if !element.Enabled() { return }
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if key == input.KeyEnter {
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element.pressed = true
element.drawAndPush(true)
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}
}
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func (element *Button) HandleKeyUp(key input.Key, modifiers input.Modifiers) {
if key == input.KeyEnter && element.pressed {
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element.pressed = false
element.drawAndPush(true)
if !element.Enabled() { return }
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if element.onClick != nil {
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element.onClick()
}
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}
}
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// OnClick sets the function to be called when the button is clicked.
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func (element *Button) OnClick (callback func ()) {
element.onClick = callback
}
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// SetEnabled sets whether this button can be clicked or not.
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func (element *Button) SetEnabled (enabled bool) {
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element.focusableControl.SetEnabled(enabled)
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}
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// SetText sets the button's label text.
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func (element *Button) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText([]rune(text))
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element.updateMinimumSize()
element.drawAndPush(false)
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}
// SetTheme sets the element's theme.
func (element *Button) SetTheme (new theme.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 (
theme.FontStyleRegular,
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theme.FontSizeNormal))
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element.updateMinimumSize()
element.drawAndPush(false)
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}
// SetConfig sets the element's configuration.
func (element *Button) SetConfig (new config.Config) {
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if new == element.config.Config { return }
element.config.Config = new
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element.updateMinimumSize()
element.drawAndPush(false)
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}
func (element *Button) updateMinimumSize () {
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textBounds := element.drawer.LayoutBounds()
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padding := element.theme.Padding(theme.PatternButton)
minimumSize := padding.Inverse().Apply(textBounds)
element.core.SetMinimumSize(minimumSize.Dx(), minimumSize.Dy())
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}
func (element *Button) drawAndPush (partial bool) {
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if element.core.HasImage () {
if partial {
element.core.DamageRegion (append (
element.drawBackground(true),
element.drawText(true))...)
} else {
element.drawAll()
element.core.DamageAll()
}
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}
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}
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func (element *Button) state () theme.State {
return theme.State {
Disabled: !element.Enabled(),
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Focused: element.Focused(),
Pressed: element.pressed,
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}
}
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func (element *Button) drawBackground (partial bool) []image.Rectangle {
state := element.state()
bounds := element.Bounds()
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pattern := element.theme.Pattern(theme.PatternButton, state)
static := element.theme.Hints(theme.PatternButton).StaticInset
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if partial && static != (artist.Inset { }) {
tiles := shatter.Shatter(bounds, static.Apply(bounds))
artist.Draw(element.core, pattern, tiles...)
return tiles
} else {
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pattern.Draw(element.core, bounds)
return []image.Rectangle { bounds }
}
}
func (element *Button) drawText (partial bool) image.Rectangle {
state := element.state()
bounds := element.Bounds()
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foreground := element.theme.Color(theme.ColorForeground, state)
sink := element.theme.Sink(theme.PatternButton)
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textBounds := element.drawer.LayoutBounds()
offset := image.Point {
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X: bounds.Min.X + (bounds.Dx() - textBounds.Dx()) / 2,
Y: bounds.Min.Y + (bounds.Dy() - textBounds.Dy()) / 2,
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}
offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
region := textBounds.Union(textBounds.Add(sink)).Add(offset)
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if element.pressed {
offset = offset.Add(sink)
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}
if partial {
pattern := element.theme.Pattern(theme.PatternButton, state)
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pattern.Draw(element.core, region)
}
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element.drawer.Draw(element.core, foreground, offset)
return region
}
func (element *Button) drawAll () {
element.drawBackground(false)
element.drawText(false)
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}