81 lines
1.9 KiB
Go
81 lines
1.9 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 iconCase = tomo.C("tomo", "icon")
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// Icon is an element capable of displaying a singular icon.
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type Icon struct {
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entity tomo.Entity
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id tomo.Icon
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size tomo.IconSize
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}
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// Icon creates a new icon element.
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func NewIcon (id tomo.Icon, size tomo.IconSize) (element *Icon) {
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element = &Icon {
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id: id,
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size: size,
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}
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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 *Icon) Entity () tomo.Entity {
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return element.entity
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}
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// SetIcon sets the element's icon.
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func (element *Icon) SetIcon (id tomo.Icon, size tomo.IconSize) {
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element.id = id
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element.size = size
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if element.entity == nil { return }
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element.updateMinimumSize()
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element.entity.Invalidate()
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}
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func (element *Icon) HandleThemeChange () {
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element.updateMinimumSize()
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element.entity.Invalidate()
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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 *Icon) Draw (destination art.Canvas) {
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if element.entity == nil { return }
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bounds := element.entity.Bounds()
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state := tomo.State { }
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element.entity.Theme().
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Pattern(tomo.PatternBackground, state, iconCase).
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Draw(destination, bounds)
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icon := element.icon()
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if icon != nil {
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iconBounds := icon.Bounds()
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offset := image.Pt (
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(bounds.Dx() - iconBounds.Dx()) / 2,
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(bounds.Dy() - iconBounds.Dy()) / 2)
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icon.Draw (
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destination,
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element.entity.Theme().Color(tomo.ColorForeground, state, iconCase),
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bounds.Min.Add(offset))
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}
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}
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func (element *Icon) icon () art.Icon {
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return element.entity.Theme().Icon(element.id, element.size, iconCase)
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}
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func (element *Icon) updateMinimumSize () {
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icon := element.icon()
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if icon == nil {
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element.entity.SetMinimumSize(0, 0)
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} else {
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bounds := icon.Bounds()
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element.entity.SetMinimumSize(bounds.Dx(), bounds.Dy())
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}
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}
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