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tomo-old/elements/basic/label.go

123 lines
3.1 KiB
Go

package basicElements
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
var labelCase = theme.C("basic", "label")
// Label is a simple text box.
type Label struct {
*core.Core
core core.CoreControl
wrap bool
text string
drawer artist.TextDrawer
onFlexibleHeightChange func ()
}
// NewLabel creates a new label. If wrap is set to true, the text inside will be
// wrapped.
func NewLabel (text string, wrap bool) (element *Label) {
element = &Label { }
element.Core, element.core = core.NewCore(element.handleResize)
face := theme.FontFaceRegular()
element.drawer.SetFace(face)
element.SetWrap(wrap)
element.SetText(text)
return
}
func (element *Label) handleResize () {
bounds := element.Bounds()
if element.wrap {
element.drawer.SetMaxWidth(bounds.Dx())
element.drawer.SetMaxHeight(bounds.Dy())
}
element.draw()
return
}
// FlexibleHeightFor returns the reccomended height for this element based on
// the given width in order to allow the text to wrap properly.
func (element *Label) FlexibleHeightFor (width int) (height int) {
if element.wrap {
return element.drawer.ReccomendedHeightFor(width)
} else {
_, height = element.MinimumSize()
return
}
}
// OnFlexibleHeightChange sets a function to be called when the parameters
// affecting this element's flexible height are changed.
func (element *Label) OnFlexibleHeightChange (callback func ()) {
element.onFlexibleHeightChange = callback
}
// SetText sets the label's text.
func (element *Label) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText([]rune(text))
element.updateMinimumSize()
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
// SetWrap sets wether or not the label's text wraps. If the text is set to
// wrap, the element will have a minimum size of a single character and
// automatically wrap its text. If the text is set to not wrap, the element will
// have a minimum size that fits its text.
func (element *Label) SetWrap (wrap bool) {
if wrap == element.wrap { return }
if !wrap {
element.drawer.SetMaxWidth(0)
element.drawer.SetMaxHeight(0)
}
element.wrap = wrap
element.updateMinimumSize()
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
func (element *Label) updateMinimumSize () {
if element.wrap {
em := element.drawer.Em().Round()
if em < 1 { em = theme.Padding() }
element.core.SetMinimumSize (
em, element.drawer.LineHeight().Round())
if element.onFlexibleHeightChange != nil {
element.onFlexibleHeightChange()
}
} else {
bounds := element.drawer.LayoutBounds()
element.core.SetMinimumSize(bounds.Dx(), bounds.Dy())
}
}
func (element *Label) draw () {
bounds := element.Bounds()
pattern, _ := theme.BackgroundPattern(theme.PatternState {
Case: labelCase,
})
artist.FillRectangle(element, pattern, bounds)
textBounds := element.drawer.LayoutBounds()
foreground, _ := theme.ForegroundPattern (theme.PatternState {
Case: labelCase,
})
element.drawer.Draw (element, foreground, bounds.Min.Sub(textBounds.Min))
}