widget/material: rename material.go to theme.go

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

widget/material/theme.go

@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package material
+
+import (
+	"image"
+	"image/color"
+
+	"gioui.org/f32"
+	"gioui.org/font"
+	"gioui.org/layout"
+	"gioui.org/op/paint"
+	"gioui.org/text"
+	"gioui.org/unit"
+	"golang.org/x/exp/shiny/materialdesign/icons"
+)
+
+type Theme struct {
+	Shaper *text.Shaper
+	Color  struct {
+		Primary color.RGBA
+		Text    color.RGBA
+		Hint    color.RGBA
+		InvText color.RGBA
+	}
+	TextSize              unit.Value
+	checkBoxCheckedIcon   *Icon
+	checkBoxUncheckedIcon *Icon
+	radioCheckedIcon      *Icon
+	radioUncheckedIcon    *Icon
+}
+
+func NewTheme() *Theme {
+	t := &Theme{
+		Shaper: font.Default(),
+	}
+	t.Color.Primary = rgb(0x3f51b5)
+	t.Color.Text = rgb(0x000000)
+	t.Color.Hint = rgb(0xbbbbbb)
+	t.Color.InvText = rgb(0xffffff)
+	t.TextSize = unit.Sp(16)
+
+	t.checkBoxCheckedIcon = mustIcon(NewIcon(icons.ToggleCheckBox))
+	t.checkBoxUncheckedIcon = mustIcon(NewIcon(icons.ToggleCheckBoxOutlineBlank))
+	t.radioCheckedIcon = mustIcon(NewIcon(icons.ToggleRadioButtonChecked))
+	t.radioUncheckedIcon = mustIcon(NewIcon(icons.ToggleRadioButtonUnchecked))
+
+	return t
+}
+
+func mustIcon(ic *Icon, err error) *Icon {
+	if err != nil {
+		panic(err)
+	}
+	return ic
+}
+
+func rgb(c uint32) color.RGBA {
+	return argb(0xff000000 | c)
+}
+
+func argb(c uint32) color.RGBA {
+	return color.RGBA{A: uint8(c >> 24), R: uint8(c >> 16), G: uint8(c >> 8), B: uint8(c)}
+}
+
+func fill(gtx *layout.Context, col color.RGBA) {
+	cs := gtx.Constraints
+	d := image.Point{X: cs.Width.Min, Y: cs.Height.Min}
+	dr := f32.Rectangle{
+		Max: f32.Point{X: float32(d.X), Y: float32(d.Y)},
+	}
+	paint.ColorOp{Color: col}.Add(gtx.Ops)
+	paint.PaintOp{Rect: dr}.Add(gtx.Ops)
+	gtx.Dimensions = layout.Dimensions{Size: d}
+}