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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"
// 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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showText bool
hasIcon bool
iconId theme.Icon
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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 { showText: true }
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element.theme.Case = theme.C("basic", "button")
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element.Core, element.core = core.NewCore(element, element.drawAll)
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element.FocusableCore,
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element.focusableControl = core.NewFocusableCore(element.core, element.drawAndPush)
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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
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element.drawAndPush()
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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()
}
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element.drawAndPush()
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}
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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
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element.drawAndPush()
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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
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element.drawAndPush()
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()
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element.drawAndPush()
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}
// SetIcon sets the icon of the button. Passing theme.IconNone removes the
// current icon if it exists.
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func (element *Button) SetIcon (id theme.Icon) {
if id == theme.IconNone {
element.hasIcon = false
element.updateMinimumSize()
element.drawAndPush()
} else {
if element.hasIcon && element.iconId == id { return }
element.hasIcon = true
element.iconId = id
}
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element.updateMinimumSize()
element.drawAndPush()
}
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// ShowText sets whether or not the button's text will be displayed.
func (element *Button) ShowText (showText bool) {
if element.showText == showText { return }
element.showText = showText
element.updateMinimumSize()
element.drawAndPush()
}
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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()
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element.drawAndPush()
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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()
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element.drawAndPush()
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}
func (element *Button) updateMinimumSize () {
padding := element.theme.Padding(theme.PatternButton)
margin := element.theme.Margin(theme.PatternButton)
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textBounds := element.drawer.LayoutBounds()
minimumSize := textBounds.Sub(textBounds.Min)
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if element.hasIcon {
icon := element.theme.Icon(element.iconId, theme.IconSizeSmall)
if icon != nil {
bounds := icon.Bounds()
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if element.showText {
minimumSize.Max.X += bounds.Dx()
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minimumSize.Max.X += margin.X
} else {
minimumSize.Max.X = bounds.Dx()
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}
}
}
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minimumSize = padding.Inverse().Apply(minimumSize)
element.core.SetMinimumSize(minimumSize.Dx(), minimumSize.Dy())
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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) drawAndPush () {
if element.core.HasImage () {
element.drawAll()
element.core.DamageAll()
}
}
func (element *Button) drawAll () {
element.drawBackground()
element.drawText()
}
func (element *Button) drawBackground () []image.Rectangle {
state := element.state()
bounds := element.Bounds()
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pattern := element.theme.Pattern(theme.PatternButton, state)
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pattern.Draw(element.core, bounds)
return []image.Rectangle { bounds }
}
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func (element *Button) drawText () {
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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margin := element.theme.Margin(theme.PatternButton)
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offset := image.Pt (
bounds.Dx() / 2,
bounds.Dy() / 2).Add(bounds.Min)
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if element.showText {
textBounds := element.drawer.LayoutBounds()
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offset.X -= textBounds.Dx() / 2
offset.Y -= textBounds.Dy() / 2
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offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
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}
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if element.hasIcon {
icon := element.theme.Icon(element.iconId, theme.IconSizeSmall)
if icon != nil {
iconBounds := icon.Bounds()
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addedWidth := iconBounds.Dx()
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iconOffset := offset
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if element.showText {
addedWidth += margin.X
}
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iconOffset.X -= addedWidth / 2
iconOffset.Y =
bounds.Min.Y +
(bounds.Dy() -
iconBounds.Dy()) / 2
if element.pressed {
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iconOffset = iconOffset.Add(sink)
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}
offset.X += addedWidth / 2
icon.Draw(element.core, foreground, iconOffset)
}
}
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if element.showText {
if element.pressed {
offset = offset.Add(sink)
}
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element.drawer.Draw(element.core, foreground, offset)
}
}