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

83 lines
2.6 KiB
Go

package elements
import "image"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
import "git.tebibyte.media/sashakoshka/tomo/default/theme"
import "git.tebibyte.media/sashakoshka/tomo/default/config"
// ProgressBar displays a visual indication of how far along a task is.
type ProgressBar struct {
entity tomo.Entity
progress float64
config config.Wrapped
theme theme.Wrapped
}
// NewProgressBar creates a new progress bar displaying the given progress
// level.
func NewProgressBar (progress float64) (element *ProgressBar) {
if progress < 0 { progress = 0 }
if progress > 1 { progress = 1 }
element = &ProgressBar { progress: progress }
element.entity = tomo.NewEntity(element)
element.theme.Case = tomo.C("tomo", "progressBar")
element.updateMinimumSize()
return
}
// Entity returns this element's entity.
func (element *ProgressBar) Entity () tomo.Entity {
return element.entity
}
// Draw causes the element to draw to the specified destination canvas.
func (element *ProgressBar) Draw (destination canvas.Canvas) {
bounds := element.entity.Bounds()
pattern := element.theme.Pattern(tomo.PatternSunken, tomo.State { })
padding := element.theme.Padding(tomo.PatternSunken)
pattern.Draw(destination, bounds)
bounds = padding.Apply(bounds)
meterBounds := image.Rect (
bounds.Min.X, bounds.Min.Y,
bounds.Min.X + int(float64(bounds.Dx()) * element.progress),
bounds.Max.Y)
mercury := element.theme.Pattern(tomo.PatternMercury, tomo.State { })
mercury.Draw(destination, meterBounds)
}
// SetProgress sets the progress level of the bar.
func (element *ProgressBar) SetProgress (progress float64) {
if progress < 0 { progress = 0 }
if progress > 1 { progress = 1 }
if progress == element.progress { return }
element.progress = progress
element.entity.Invalidate()
}
// SetTheme sets the element's theme.
func (element *ProgressBar) SetTheme (new tomo.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
element.updateMinimumSize()
element.entity.Invalidate()
}
// SetConfig sets the element's configuration.
func (element *ProgressBar) SetConfig (new tomo.Config) {
if new == nil || new == element.config.Config { return }
element.config.Config = new
element.updateMinimumSize()
element.entity.Invalidate()
}
func (element *ProgressBar) updateMinimumSize() {
padding := element.theme.Padding(tomo.PatternSunken)
innerPadding := element.theme.Padding(tomo.PatternMercury)
element.entity.SetMinimumSize (
padding.Horizontal() + innerPadding.Horizontal(),
padding.Vertical() + innerPadding.Vertical())
}