68 lines
2.1 KiB
Go
68 lines
2.1 KiB
Go
package elements
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import "image"
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import "tomo"
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import "art"
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var progressBarCase = tomo.C("tomo", "progressBar")
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// ProgressBar displays a visual indication of how far along a task is.
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type ProgressBar struct {
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entity tomo.Entity
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progress float64
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}
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// NewProgressBar creates a new progress bar displaying the given progress
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// level.
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func NewProgressBar (progress float64) (element *ProgressBar) {
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if progress < 0 { progress = 0 }
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if progress > 1 { progress = 1 }
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element = &ProgressBar { progress: progress }
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element.entity = tomo.GetBackend().NewEntity(element)
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element.updateMinimumSize()
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return
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}
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// Entity returns this element's entity.
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func (element *ProgressBar) Entity () tomo.Entity {
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return element.entity
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}
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// Draw causes the element to draw to the specified destination canvas.
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func (element *ProgressBar) Draw (destination art.Canvas) {
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bounds := element.entity.Bounds()
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pattern := element.entity.Theme().Pattern(tomo.PatternSunken, tomo.State { }, progressBarCase)
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padding := element.entity.Theme().Padding(tomo.PatternSunken, progressBarCase)
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pattern.Draw(destination, bounds)
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bounds = padding.Apply(bounds)
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meterBounds := image.Rect (
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bounds.Min.X, bounds.Min.Y,
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bounds.Min.X + int(float64(bounds.Dx()) * element.progress),
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bounds.Max.Y)
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mercury := element.entity.Theme().Pattern(tomo.PatternMercury, tomo.State { }, progressBarCase)
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mercury.Draw(destination, meterBounds)
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}
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// SetProgress sets the progress level of the bar.
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func (element *ProgressBar) SetProgress (progress float64) {
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if progress < 0 { progress = 0 }
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if progress > 1 { progress = 1 }
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if progress == element.progress { return }
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element.progress = progress
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element.entity.Invalidate()
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}
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func (element *ProgressBar) HandleThemeChange () {
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element.updateMinimumSize()
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element.entity.Invalidate()
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}
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func (element *ProgressBar) updateMinimumSize() {
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padding := element.entity.Theme().Padding(tomo.PatternSunken, progressBarCase)
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innerPadding := element.entity.Theme().Padding(tomo.PatternMercury, progressBarCase)
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element.entity.SetMinimumSize (
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padding.Horizontal() + innerPadding.Horizontal(),
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padding.Vertical() + innerPadding.Vertical())
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}
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