ui: add Config.Sp and Config.Dp convenience methods

And rename Pixels to Val.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/app/os_macos.go

@@ -207,8 +207,8 @@ func Main() {
 	}
 	cfg := getConfig()
 	opts := singleWindow.opts
-	w := cfg.Pixels(opts.Width)
+	w := cfg.Val(opts.Width)
-	h := cfg.Pixels(opts.Height)
+	h := cfg.Val(opts.Height)
 	title := C.CString(opts.Title)
 	defer C.free(unsafe.Pointer(title))
 	C.gio_main(view, title, C.CGFloat(w), C.CGFloat(h))

ui/app/os_wayland.go

@@ -222,8 +222,8 @@ func createNativeWindow(opts *WindowOptions) (*window, error) {
 	C.free(unsafe.Pointer(title))
 
 	_, _, cfg := w.config()
-	w.width = int(cfg.Pixels(opts.Width) + .5)
+	w.width = int(cfg.Val(opts.Width) + .5)
-	w.height = int(cfg.Pixels(opts.Height) + .5)
+	w.height = int(cfg.Val(opts.Height) + .5)
 	if conn.decor != nil {
 		// Request server side decorations.
 		w.decor = C.zxdg_decoration_manager_v1_get_toplevel_decoration(conn.decor, w.topLvl)

ui/app/os_windows.go

@@ -217,8 +217,8 @@ func createNativeWindow(opts *WindowOptions) (*window, error) {
 	}
 	defer unregisterClass(cls, hInst)
 	wr := rect{
-		right:  int32(cfg.Pixels(opts.Width) + .5),
+		right:  int32(cfg.Val(opts.Width) + .5),
-		bottom: int32(cfg.Pixels(opts.Height) + .5),
+		bottom: int32(cfg.Val(opts.Height) + .5),
 	}
 	dwStyle := uint32(_WS_OVERLAPPEDWINDOW)
 	dwExStyle := uint32(_WS_EX_APPWINDOW | _WS_EX_WINDOWEDGE)

ui/gesture/gestures.go

@@ -157,9 +157,9 @@ func (s *Scroll) Scroll(cfg *ui.Config, q pointer.Events, axis Axis) int {
 				break
 			}
 			fling := s.estimator.Estimate()
-			if slop, d := cfg.Pixels(touchSlop), fling.Distance; d >= slop || -slop >= d {
+			if slop, d := cfg.Val(touchSlop), fling.Distance; d >= slop || -slop >= d {
-				if min, v := cfg.Pixels(minFlingVelocity), fling.Velocity; v >= min || -min >= v {
+				if min, v := cfg.Val(minFlingVelocity), fling.Velocity; v >= min || -min >= v {
-					max := cfg.Pixels(maxFlingVelocity)
+					max := cfg.Val(maxFlingVelocity)
 					if v > max {
 						v = max
 					} else if v < -max {
@@ -192,7 +192,7 @@ func (s *Scroll) Scroll(cfg *ui.Config, q pointer.Events, axis Axis) int {
 			v := int(math.Round(float64(val)))
 			dist := s.last - v
 			if e.Priority < pointer.Grabbed {
-				slop := cfg.Pixels(touchSlop)
+				slop := cfg.Val(touchSlop)
 				if dist := float32(dist); dist >= slop || -slop >= dist {
 					s.grab = true
 				}

ui/measure/measure.go

@@ -103,7 +103,7 @@ func (f *Faces) init() {
 }
 
 func (f *textFace) Layout(str string, singleLine bool, maxWidth int) *text.Layout {
-	ppem := fixed.Int26_6(f.faces.Cfg.Pixels(f.size)*64 + .5)
+	ppem := fixed.Int26_6(f.faces.Cfg.Val(f.size)*64 + .5)
 	lk := layoutKey{
 		f:          f.font.Font,
 		ppem:       ppem,
@@ -122,7 +122,7 @@ func (f *textFace) Layout(str string, singleLine bool, maxWidth int) *text.Layou
 }
 
 func (f *textFace) Path(str text.String) *draw.Path {
-	ppem := fixed.Int26_6(f.faces.Cfg.Pixels(f.size)*64 + .5)
+	ppem := fixed.Int26_6(f.faces.Cfg.Val(f.size)*64 + .5)
 	pk := pathKey{
 		f:    f.font.Font,
 		ppem: ppem,

ui/text/editor.go

@@ -124,12 +124,12 @@ func (e *Editor) Update(c *ui.Config, pq pointer.Events, kq key.Events) {
 }
 
 func (e *Editor) caretWidth() fixed.Int26_6 {
-	oneDp := int(e.cfg.Pixels(ui.Dp(1)) + .5)
+	oneDp := int(e.cfg.Val(ui.Dp(1)) + .5)
 	return fixed.Int26_6(oneDp * 64)
 }
 
 func (e *Editor) W(ops *ui.Ops, cs layout.Constraints) layout.Dimens {
-	twoDp := int(e.cfg.Pixels(ui.Dp(2)) + 0.5)
+	twoDp := int(e.cfg.Val(ui.Dp(2)) + 0.5)
 	e.padLeft, e.padRight = twoDp, twoDp
 	maxWidth := cs.Width.Max
 	if e.SingleLine {

ui/ui.go

@@ -22,8 +22,18 @@ type Config struct {
 	Now time.Time
 }
 
-// Pixels converts a value to unitless device pixels.
+// Dp converts a value in dp units to pixels.
-func (c *Config) Pixels(v Value) float32 {
+func (c *Config) Dp(dp float32) float32 {
+	return c.PxPerDp * dp
+}
+
+// Sp converts a value in sp units to pixels.
+func (c *Config) Sp(sp float32) float32 {
+	return c.PxPerSp * sp
+}
+
+// Val converts a value to pixels.
+func (c *Config) Val(v Value) float32 {
 	switch v.U {
 	case UnitPx:
 		return v.V