67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package system
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import "io"
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import "image"
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import "git.tebibyte.media/tomo/tomo"
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import "git.tebibyte.media/tomo/tomo/canvas"
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import "git.tebibyte.media/tomo/backend/internal/util"
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// System is coupled to a tomo.Backend implementation, and manages Hierarchies
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// and Boxes.
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type System struct {
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link BackendLink
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style *tomo.Style
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styleNonce int
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iconsNonce int
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hierarchies util.Set[*Hierarchy]
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}
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// BackendLink allows the System to call up into the tomo.Backend implementation
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// which contains it in order to do things such as create new textures.
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type BackendLink interface {
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// NewTexture creates a new texture from an image.
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NewTexture (image.Image) canvas.TextureCloser
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// NewSurface creates a new surface with the specified bounds.
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NewSurface (image.Rectangle) (SurfaceLink, error)
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}
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// SurfaceLink wraps a Surface created by the backend implementation, allowing
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// the System a higher level of control over it.
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type SurfaceLink interface {
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io.Closer
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GetSurface () any
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SetSize (image.Rectangle)
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}
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// New creates a new System.
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func New (link BackendLink) *System {
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return &System {
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link: link,
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hierarchies: make(util.Set[*Hierarchy]),
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}
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}
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// SetStyle sets the tomo.Style that is applied to objects, and notifies them
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// that the style has changed.
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func (this *System) SetStyle (style *tomo.Style) {
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this.style = style
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this.styleNonce ++
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for hierarchy := range this.hierarchies {
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hierarchy.setStyle()
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}
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}
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// SetIconSet notifies objects that the icons have changed.
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func (this *System) SetIconSet (iconSet tomo.IconSet) {
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this.iconsNonce ++
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for hierarchy := range this.hierarchies {
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hierarchy.setIconSet()
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}
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}
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func (this *System) removeHierarchy (hierarchy *Hierarchy) {
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delete(this.hierarchies, hierarchy)
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}
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