Add support for AttrIcon

internal/system/box.go

@@ -27,12 +27,15 @@ type box struct {
 	focusQueued *bool
 
 	attrColor       attrHierarchy[tomo.AttrColor]
+	attrIcon        attrHierarchy[tomo.AttrIcon]
 	attrTexture     attrHierarchy[tomo.AttrTexture]
 	attrTextureMode attrHierarchy[tomo.AttrTextureMode]
 	attrBorder      attrHierarchy[tomo.AttrBorder]
 	attrMinimumSize attrHierarchy[tomo.AttrMinimumSize]
 	attrPadding     attrHierarchy[tomo.AttrPadding]
 
+	icon canvas.Texture
+
 	dndData   data.Data
 	dndAccept []data.Mime
 	focusable bool
@@ -192,6 +195,11 @@ func (this *box) setAttr (attr tomo.Attr, user bool) {
 			this.invalidateDraw()
 		}
 		
+	case tomo.AttrIcon:
+		if this.attrIcon.Set(attr, user) {
+			this.handleIconChange()
+		}
+		
 	case tomo.AttrTexture:
 		if this.attrTexture.Set(attr, user) {
 			this.invalidateDraw()
@@ -227,6 +235,11 @@ func (this *box) unsetAttr (kind tomo.AttrKind, user bool) {
 			this.invalidateDraw()
 		}
 		
+	case tomo.AttrKindIcon:
+		if this.attrIcon.Unset(user) {
+			this.handleIconChange()
+		}
+		
 	case tomo.AttrKindTexture:
 		if this.attrTexture.Unset(user) {
 			this.invalidateDraw()
@@ -423,6 +436,18 @@ func (this *box) Draw (can canvas.Canvas) {
 
 	// centered texture
 	if textureMode == tomo.TextureModeCenter && texture != nil {
+		this.centeredTexture(can, texture)
+	}
+
+	// centered icon
+	if this.icon != nil {
+		this.centeredTexture(can, this.icon)
+	}
+}
+
+func (this *box) centeredTexture (can canvas.Canvas, texture canvas.Texture) {
+	pen           := can.Pen()
+	bounds        := this.Bounds()
 	textureBounds := texture.Bounds()
 	textureOrigin :=
 		bounds.Min.
@@ -437,7 +462,6 @@ func (this *box) Draw (can canvas.Canvas) {
 	pen.Texture(texture)
 	pen.Rectangle(textureBounds.Sub(textureBounds.Min).Add(textureOrigin))
 }
-}
 
 func (this *box) drawBorders (can canvas.Canvas) {
 	if can == nil { return }
@@ -576,6 +600,15 @@ func (this *box) handleBorderChange (previousBorderSum tomo.Inset, different boo
 	}
 }
 
+func (this *box) handleIconChange () {
+	this.icon = nil
+	hierarchy := this.getHierarchy()
+	if hierarchy == nil { return }	
+	icon := this.attrIcon.Value()
+	if icon.Icon == tomo.IconUnknown { return }
+	this.icon = hierarchy.getIconSet().Icon(icon.Icon, icon.Size)
+}
+
 func (this *box) invalidateStyle () {
 	hierarchy := this.getHierarchy()
 	if hierarchy == nil { return }

x/backend.go

@@ -4,7 +4,9 @@ import "image"
 import "errors"
 import "git.tebibyte.media/tomo/tomo"
 import "git.tebibyte.media/tomo/xgbkb"
+import "git.tebibyte.media/tomo/tomo/data"
 import "git.tebibyte.media/tomo/tomo/canvas"
+import "git.tebibyte.media/tomo/backend/style"
 import "git.tebibyte.media/tomo/backend/x/canvas"
 import "git.tebibyte.media/tomo/backend/internal/system"
 
@@ -18,6 +20,9 @@ type Backend struct {
 	x         *xgbutil.XUtil
 	system    *system.System
 
+	style     *style.Style
+	iconSet   style.IconSet
+	
 	doChannel chan func()
 	windows   map[xproto.Window] *window
 	open      bool
@@ -126,12 +131,33 @@ func (this *Backend) NewCanvas (bounds image.Rectangle) canvas.CanvasCloser {
 	return xcanvas.NewCanvas(this.x, bounds)
 }
 
-func (this *Backend) SetStyle (style *tomo.Style) {
+func (this *Backend) ColorRGBA (id tomo.Color) (r, g, b, a uint32) {
+	if col, ok := this.style.Colors[id]; ok {
+		return col.RGBA()
+	}
+	return 0xFFFF, 0, 0xFFFF, 0xFFFF // punish bad styles
+}
+
+func (this *Backend) IconTexture (id tomo.Icon, size tomo.IconSize) canvas.Texture {
+	return this.iconSet.Icon(id, size)
+}
+
+func (this *Backend) MimeIconTexture (mime data.Mime, size tomo.IconSize) canvas.Texture {
+	return this.iconSet.MimeIcon(mime, size)
+}
+
+func (this *Backend) SetStyle (style *style.Style) {
+	this.style = style
 	this.system.SetStyle(style)
 }
 
-func (this *Backend) SetIconSet (icons tomo.IconSet) {
+func (this *Backend) SetIconSet (iconSet style.IconSet) {
-	this.system.SetIconSet(icons)
+	this.iconSet = iconSet
+	this.system.SetIconSet(iconSet)
+}
+
+func (this *Backend) SetFaceSet (faceSet style.FaceSet) {
+	this.system.SetFaceSet(faceSet)
 }
 
 func (this *Backend) assert () {