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tomo-old/elements/basic/label.go

109 lines
2.6 KiB
Go

package basic
import "image"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
// Label is a simple text box.
type Label struct {
*core.Core
core core.CoreControl
wrap bool
text string
drawer artist.TextDrawer
}
// 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)
face := theme.FontFaceRegular()
element.drawer.SetFace(face)
element.SetWrap(wrap)
element.SetText(text)
return
}
// Handle handles and event.
func (element *Label) Handle (event tomo.Event) {
switch event.(type) {
case tomo.EventResize:
resizeEvent := event.(tomo.EventResize)
element.core.AllocateCanvas (
resizeEvent.Width,
resizeEvent.Height)
if element.wrap {
element.drawer.SetMaxWidth (resizeEvent.Width)
element.drawer.SetMaxHeight(resizeEvent.Height)
}
element.draw()
}
return
}
// SetText sets the label's text.
func (element *Label) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText(text)
element.updateMinimumSize()
if element.core.HasImage () {
element.draw()
element.core.PushAll()
}
}
// 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.PushAll()
}
}
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())
} else {
bounds := element.drawer.LayoutBounds()
element.core.SetMinimumSize(bounds.Dx(), bounds.Dy())
}
}
func (element *Label) draw () {
bounds := element.core.Bounds()
artist.FillRectangle (
element.core,
theme.BackgroundPattern(),
bounds)
textBounds := element.drawer.LayoutBounds()
foreground := theme.ForegroundPattern(true)
element.drawer.Draw (element.core, foreground, image.Point {
X: 0 - textBounds.Min.X,
Y: 0 - textBounds.Min.Y,
})
}