all: rename the gioui.org/ui module to gioui.org

The "ui" is redundant and stutters.

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

text/measure.go

@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package text
+
+import (
+	"fmt"
+	"image"
+
+	"gioui.org/ui"
+	"gioui.org/layout"
+	"golang.org/x/image/math/fixed"
+)
+
+// A Line contains the measurements of a line of text.
+type Line struct {
+	Text String
+	// Width is the width of the line.
+	Width fixed.Int26_6
+	// Ascent is the height above the baseline.
+	Ascent fixed.Int26_6
+	// Descent is the height below the baseline, including
+	// the line gap.
+	Descent fixed.Int26_6
+	// Bounds is the visible bounds of the line.
+	Bounds fixed.Rectangle26_6
+}
+
+type String struct {
+	String string
+	// Advances contain the advance of each rune in String.
+	Advances []fixed.Int26_6
+}
+
+// A Layout contains the measurements of a body of text as
+// a list of Lines.
+type Layout struct {
+	Lines []Line
+}
+
+// LayoutOptions specify the constraints of a text layout.
+type LayoutOptions struct {
+	// MaxWidth set the maximum width of the layout.
+	MaxWidth int
+	// SingleLine specify that line breaks are ignored.
+	SingleLine bool
+}
+
+type Face interface {
+	// Layout returns the text layout for a string given a set of
+	// options.
+	Layout(s string, opts LayoutOptions) *Layout
+	// Path returns the ClipOp outline of a text recorded in a macro.
+	Path(s String) ui.MacroOp
+}
+
+type Alignment uint8
+
+const (
+	Start Alignment = iota
+	End
+	Middle
+)
+
+func linesDimens(lines []Line) layout.Dimensions {
+	var width fixed.Int26_6
+	var h int
+	var baseline int
+	if len(lines) > 0 {
+		baseline = lines[0].Ascent.Ceil()
+		var prevDesc fixed.Int26_6
+		for _, l := range lines {
+			h += (prevDesc + l.Ascent).Ceil()
+			prevDesc = l.Descent
+			if l.Width > width {
+				width = l.Width
+			}
+		}
+		h += lines[len(lines)-1].Descent.Ceil()
+	}
+	w := width.Ceil()
+	return layout.Dimensions{
+		Size: image.Point{
+			X: w,
+			Y: h,
+		},
+		Baseline: baseline,
+	}
+}
+
+func align(align Alignment, width fixed.Int26_6, maxWidth int) fixed.Int26_6 {
+	mw := fixed.I(maxWidth)
+	switch align {
+	case Middle:
+		return fixed.I(((mw - width) / 2).Floor())
+	case End:
+		return fixed.I((mw - width).Floor())
+	case Start:
+		return 0
+	default:
+		panic(fmt.Errorf("unknown alignment %v", align))
+	}
+}
+
+func (a Alignment) String() string {
+	switch a {
+	case Start:
+		return "Start"
+	case End:
+		return "End"
+	case Middle:
+		return "Middle"
+	default:
+		panic("unreachable")
+	}
+}