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tomo-old/elements/basic/label.go

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package basicElements
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import "golang.org/x/image/math/fixed"
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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/textdraw"
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import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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// Label is a simple text box.
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type Label struct {
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*core.Core
core core.CoreControl
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align textdraw.Align
wrap bool
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text string
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drawer textdraw.Drawer
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forcedColumns int
forcedRows int
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config config.Wrapped
theme theme.Wrapped
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onFlexibleHeightChange func ()
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}
// 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) {
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element = &Label { }
element.theme.Case = theme.C("basic", "label")
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element.Core, element.core = core.NewCore(element, element.handleResize)
element.SetWrap(wrap)
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element.SetText(text)
return
}
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func (element *Label) redo () {
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face := element.theme.FontFace (
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theme.FontStyleRegular,
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theme.FontSizeNormal)
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element.drawer.SetFace(face)
element.updateMinimumSize()
bounds := element.Bounds()
if element.wrap {
element.drawer.SetMaxWidth(bounds.Dx())
element.drawer.SetMaxHeight(bounds.Dy())
}
element.draw()
element.core.DamageAll()
}
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func (element *Label) handleResize () {
bounds := element.Bounds()
if element.wrap {
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element.drawer.SetMaxWidth(bounds.Dx())
element.drawer.SetMaxHeight(bounds.Dy())
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}
element.draw()
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return
}
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// 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 {
_, 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.
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func (element *Label) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText([]rune(text))
element.updateMinimumSize()
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if element.core.HasImage () {
element.draw()
element.core.DamageAll()
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}
}
// 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()
}
}
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// 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()
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
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// SetTheme sets the element's theme.
func (element *Label) 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()
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
// SetConfig sets the element's configuration.
func (element *Label) SetConfig (new config.Config) {
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if new == element.config.Config { return }
element.config.Config = new
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element.updateMinimumSize()
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
func (element *Label) updateMinimumSize () {
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var width, height int
if element.wrap {
em := element.drawer.Em().Round()
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if em < 1 {
em = element.theme.Padding(theme.PatternBackground)[0]
}
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width, height = em, element.drawer.LineHeight().Round()
if element.onFlexibleHeightChange != nil {
element.onFlexibleHeightChange()
}
} else {
bounds := element.drawer.LayoutBounds()
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width, height = bounds.Dx(), bounds.Dy()
}
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if element.forcedColumns > 0 {
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width =
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element.drawer.Em().
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Mul(fixed.I(element.forcedColumns)).Floor()
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}
if element.forcedRows > 0 {
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height =
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element.drawer.LineHeight().
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Mul(fixed.I(element.forcedRows)).Floor()
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}
element.core.SetMinimumSize(width, height)
}
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func (element *Label) draw () {
bounds := element.Bounds()
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pattern := element.theme.Pattern (
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theme.PatternBackground,
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theme.State { })
pattern.Draw(element.core, bounds)
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textBounds := element.drawer.LayoutBounds()
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foreground := element.theme.Color (
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theme.ColorForeground,
theme.State { })
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element.drawer.Draw(element.core, foreground, bounds.Min.Sub(textBounds.Min))
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}