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