Grid stub

elements/grid.go

@@ -0,0 +1,134 @@
+package elements
+
+import "image"
+import "golang.org/x/image/font"
+import "git.tebibyte.media/sashakoshka/tomo"
+import "git.tebibyte.media/sashakoshka/tomo/input"
+import "git.tebibyte.media/sashakoshka/tomo/default/theme"
+import "git.tebibyte.media/sashakoshka/tomo/default/config"
+// import "git.tebibyte.media/sashakoshka/tomo/textdraw"
+import "git.tebibyte.media/sashakoshka/tomo/elements/core"
+
+type gridCell struct {
+	rune
+	tomo.FontStyle
+	background tomo.Color
+	foreground tomo.Color
+	clean bool
+}
+
+type gridBuffer struct {
+	cells  []gridCell
+	stride int
+}
+
+// Grid is an array of monospaced character cells. Each one has a foreground and
+// background color. It satisfies io.Writer and can be fed text with ANSI escape
+// codes.
+type Grid struct {
+	*core.Core
+	*core.FocusableCore
+	core core.CoreControl
+	
+	cells      []gridCell
+	stride     int
+	cellWidth  int
+	cellHeight int
+
+	face font.Face
+	config config.Wrapped
+	theme  theme.Wrapped
+	
+	onResize func ()
+}
+
+func NewGrid () (element *Grid) {
+	element = &Grid { }
+	element.theme.Case = tomo.C("tomo", "grid")
+	element.Core, element.core = core.NewCore(element, element.drawAndPush)
+	element.updateFont()
+	element.updateMinimumSize()
+	return
+}
+
+func (element *Grid) HandleMouseDown (x, y int, button input.Button) {
+	
+}
+
+func (element *Grid) HandleMouseUp (x, y int, button input.Button) {
+	
+}
+
+func (element *Grid) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
+	
+}
+
+func (element *Grid) HandleKeyUp(key input.Key, modifiers input.Modifiers) {
+	
+}
+
+// SetTheme sets the element's theme.
+func (element *Grid) SetTheme (new tomo.Theme) {
+	if new == element.theme.Theme { return }
+	element.theme.Theme = new
+	element.updateFont()
+	element.updateMinimumSize()
+	element.drawAndPush()
+}
+
+// SetConfig sets the element's configuration.
+func (element *Grid) SetConfig (new tomo.Config) {
+	if new == element.config.Config { return }
+	element.config.Config = new
+	element.updateMinimumSize()
+	element.drawAndPush()
+}
+
+func (element *Grid) alloc () bool {
+	bounds := element.Bounds()
+	width  := bounds.Dx() / element.cellWidth
+	height := bounds.Dy() / element.cellHeight
+	unchanged :=
+		width  == element.stride &&
+		height == len(element.cells) / element.stride
+	if unchanged { return false }
+
+	// TODO: attempt to wrap text
+	element.stride = width
+	element.cells  = make([]gridCell, width * height)
+	for index := range element.cells {
+		element.cells[index].background = tomo.ColorBackground
+		element.cells[index].foreground = tomo.ColorForeground
+	}
+	return true
+}
+
+func (element *Grid) updateFont () {
+	element.face = element.theme.FontFace (
+		tomo.FontStyleMonospace,
+		tomo.FontSizeNormal)
+	emSpace, _ := element.face.GlyphAdvance('M')
+	metrics    := element.face.Metrics()
+	element.cellWidth  = emSpace.Round()
+	element.cellHeight = metrics.Height.Round()
+}
+
+func (element *Grid) updateMinimumSize () {
+	element.core.SetMinimumSize(element.cellWidth, element.cellHeight)
+}
+
+func (element *Grid) state () tomo.State {
+	return tomo.State {
+		
+	}
+}
+
+func (element *Grid) drawAndPush () {
+	if element.core.HasImage () {
+		element.core.DamageRegion(element.draw(true))
+	}
+}
+
+func (element *Grid) draw (force bool) image.Rectangle {
+
+}

go.mod

@@ -22,3 +22,4 @@ require (
 	github.com/BurntSushi/graphics-go v0.0.0-20160129215708-b43f31a4a966 // indirect
 	github.com/jezek/xgb v1.1.0
 )
+

theme.go

@@ -276,12 +276,13 @@ type FontSize int; const (
 	// about.
 	FontSizeSmall
 )
-	
+
 // FontStyle specifies stylistic alterations to a font face.
 type FontStyle int; const (
 	FontStyleRegular    FontStyle = 0
 	FontStyleBold       FontStyle = 1
 	FontStyleItalic     FontStyle = 2
+	FontStyleMonospace  FontStyle = 4
 	FontStyleBoldItalic FontStyle = 1 | 2
 )