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tomo-old/elements/label.go
2023-04-18 13:14:10 -04:00

173 lines
4.7 KiB
Go

package elements
import "golang.org/x/image/math/fixed"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
import "git.tebibyte.media/sashakoshka/tomo/textdraw"
import "git.tebibyte.media/sashakoshka/tomo/default/theme"
import "git.tebibyte.media/sashakoshka/tomo/default/config"
// Label is a simple text box.
type Label struct {
entity tomo.FlexibleEntity
align textdraw.Align
wrap bool
text string
drawer textdraw.Drawer
forcedColumns int
forcedRows int
minHeight int
config config.Wrapped
theme theme.Wrapped
}
// NewLabel creates a new label.
func NewLabel (text string) (element *Label) {
element = &Label { }
element.theme.Case = tomo.C("tomo", "label")
element.entity = tomo.NewEntity(element).(tomo.FlexibleEntity)
element.drawer.SetFace (element.theme.FontFace (
tomo.FontStyleRegular,
tomo.FontSizeNormal))
element.SetText(text)
return
}
// NewLabelWrapped creates a new label with text wrapping on.
func NewLabelWrapped (text string) (element *Label) {
element = NewLabel(text)
element.SetWrap(true)
return
}
// Entity returns this element's entity.
func (element *Label) Entity () tomo.Entity {
return element.entity
}
// EmCollapse forces a minimum width and height upon the label. The width is
// measured in emspaces, and the height is measured in lines. If a zero value is
// given for a dimension, its minimum will be determined by the label's content.
// If the label's content is greater than these dimensions, it will be truncated
// to fit.
func (element *Label) EmCollapse (columns int, rows int) {
element.forcedColumns = columns
element.forcedRows = rows
element.updateMinimumSize()
}
// 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 {
return element.minHeight
}
}
// 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()
element.entity.Invalidate()
}
// 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()
element.entity.Invalidate()
}
// SetAlign sets the alignment method of the label.
func (element *Label) SetAlign (align textdraw.Align) {
if align == element.align { return }
element.align = align
element.drawer.SetAlign(align)
element.updateMinimumSize()
element.entity.Invalidate()
}
// SetTheme sets the element's theme.
func (element *Label) 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 *Label) SetConfig (new tomo.Config) {
if new == element.config.Config { return }
element.config.Config = new
element.updateMinimumSize()
element.entity.Invalidate()
}
// Draw causes the element to draw to the specified destination canvas.
func (element *Label) Draw (destination canvas.Canvas) {
bounds := element.entity.Bounds()
if element.wrap {
element.drawer.SetMaxWidth(bounds.Dx())
element.drawer.SetMaxHeight(bounds.Dy())
}
element.entity.DrawBackground(destination)
textBounds := element.drawer.LayoutBounds()
foreground := element.theme.Color (
tomo.ColorForeground,
tomo.State { })
element.drawer.Draw(destination, foreground, bounds.Min.Sub(textBounds.Min))
}
func (element *Label) updateMinimumSize () {
var width, height int
if element.wrap {
em := element.drawer.Em().Round()
if em < 1 {
em = element.theme.Padding(tomo.PatternBackground)[0]
}
width, height = em, element.drawer.LineHeight().Round()
element.entity.NotifyFlexibleHeightChange()
} else {
bounds := element.drawer.LayoutBounds()
width, height = bounds.Dx(), bounds.Dy()
}
if element.forcedColumns > 0 {
width =
element.drawer.Em().
Mul(fixed.I(element.forcedColumns)).Floor()
}
if element.forcedRows > 0 {
height =
element.drawer.LineHeight().
Mul(fixed.I(element.forcedRows)).Floor()
}
element.minHeight = height
element.entity.SetMinimumSize(width, height)
}