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tomo-old/elements/icon.go
Sasha Koshka 437aef0c27 Redid the entity system a bit to make it more reliable
Now it supports things like parenting elements before they are
added to a window and elements no longer have to constantly check
for a nil entity
2023-04-15 01:14:36 -04:00

87 lines
2.2 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/artist"
import "git.tebibyte.media/sashakoshka/tomo/default/theme"
// Icon is an element capable of displaying a singular icon.
type Icon struct {
entity tomo.Entity
theme theme.Wrapped
id tomo.Icon
size tomo.IconSize
}
// Icon creates a new icon element.
func NewIcon (id tomo.Icon, size tomo.IconSize) (element *Icon) {
element = &Icon {
id: id,
size: size,
}
element.entity = tomo.NewEntity(element)
element.theme.Case = tomo.C("tomo", "icon")
element.updateMinimumSize()
return
}
// Entity returns this element's entity.
func (element *Icon) Entity () tomo.Entity {
return element.entity
}
// SetIcon sets the element's icon.
func (element *Icon) SetIcon (id tomo.Icon, size tomo.IconSize) {
element.id = id
element.size = size
if element.entity == nil { return }
element.updateMinimumSize()
element.entity.Invalidate()
}
// SetTheme sets the element's theme.
func (element *Icon) SetTheme (new tomo.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
if element.entity == nil { return }
element.updateMinimumSize()
element.entity.Invalidate()
}
// Draw causes the element to draw to the specified destination canvas.
func (element *Icon) Draw (destination canvas.Canvas) {
if element.entity == nil { return }
bounds := element.entity.Bounds()
state := tomo.State { }
element.theme.
Pattern(tomo.PatternBackground, state).
Draw(destination, bounds)
icon := element.icon()
if icon != nil {
iconBounds := icon.Bounds()
offset := image.Pt (
(bounds.Dx() - iconBounds.Dx()) / 2,
(bounds.Dy() - iconBounds.Dy()) / 2)
icon.Draw (
destination,
element.theme.Color(tomo.ColorForeground, state),
bounds.Min.Add(offset))
}
}
func (element *Icon) icon () artist.Icon {
return element.theme.Icon(element.id, element.size)
}
func (element *Icon) updateMinimumSize () {
icon := element.icon()
if icon == nil {
element.entity.SetMinimumSize(0, 0)
} else {
bounds := icon.Bounds()
element.entity.SetMinimumSize(bounds.Dx(), bounds.Dy())
}
}