Initial commit

elements/basic/label.go

@@ -0,0 +1,114 @@
+package basic
+
+import "image"
+import "image/color"
+import "git.tebibyte.media/sashakoshka/tomo"
+import "git.tebibyte.media/sashakoshka/tomo/theme"
+import "git.tebibyte.media/sashakoshka/tomo/artist"
+
+type Label struct {
+	core   Core
+	text   string
+	drawer artist.TextDrawer
+}
+
+func NewLabel (text string) (element *Label) {
+	element = &Label {  }
+	element.core = NewCore(element)
+	face := theme.FontFaceRegular()
+	element.drawer.SetFace(face)
+	element.SetText(text)
+	// FIXME: set the minimum size to one char
+	metrics := face.Metrics()
+	emspace, _ := face.GlyphAdvance('M')
+	intEmspace := emspace.Round()
+	if intEmspace < 1 { intEmspace = theme.Padding()}
+	element.core.SetMinimumSize(intEmspace, metrics.Height.Round())
+	return
+}
+
+func (element *Label) Handle (event tomo.Event) {
+	switch event.(type) {
+	case tomo.EventResize:
+		resizeEvent := event.(tomo.EventResize)
+		element.core.AllocateCanvas (
+			resizeEvent.Width,
+			resizeEvent.Height)
+		element.drawer.SetMaxWidth (resizeEvent.Width)
+		element.drawer.SetMaxHeight(resizeEvent.Height)
+		element.draw()
+	}
+	return
+}
+
+func (element *Label) SetText (text string) {
+	if element.text == text { return }
+
+	element.text = text
+	element.drawer.SetText(text)
+	if element.core.HasImage () {
+		element.draw()
+		element.core.PushAll()
+	}
+}
+
+func (element *Label) ColorModel () (model color.Model) {
+	return color.RGBAModel
+}
+
+func (element *Label) At (x, y int) (pixel color.Color) {
+	pixel = element.core.At(x, y)
+	return
+}
+
+func (element *Label) RGBAAt (x, y int) (pixel color.RGBA) {
+	pixel = element.core.RGBAAt(x, y)
+	return
+}
+
+func (element *Label) Bounds () (bounds image.Rectangle) {
+	bounds = element.core.Bounds()
+	return
+}
+
+func (element *Label) SetDrawCallback (draw func (region tomo.Image)) {
+	element.core.SetDrawCallback(draw)
+}
+
+func (element *Label) SetMinimumSizeChangeCallback (
+	notify func (width, height int),
+) {
+	element.core.SetMinimumSizeChangeCallback(notify)
+}
+
+func (element *Label) Selectable () (selectable bool) {
+	return
+}
+
+func (element *Label) MinimumWidth () (minimum int) {
+	minimum = element.core.MinimumWidth()
+	return
+}
+
+func (element *Label) MinimumHeight () (minimum int) {
+	minimum = element.core.MinimumHeight()
+	return
+}
+
+func (element *Label) draw () {
+	bounds := element.core.Bounds()
+
+	artist.Rectangle (
+		element.core,
+		theme.BackgroundImage(),
+		nil, 0,
+		bounds)
+
+	textBounds := element.drawer.LayoutBounds()
+
+	foreground := theme.ForegroundImage()
+	element.drawer.Draw (element.core, foreground, image.Point {
+		X: 0 - textBounds.Min.X,
+		Y: 0 - textBounds.Min.Y,
+	})
+}