all: initial import

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

ui/app/app.go

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package app
+
+import (
+	"image"
+	"os"
+	"strings"
+
+	"gioui.org/ui"
+)
+
+type Draw struct {
+	Config *ui.Config
+	Size   image.Point
+	// Whether this draw is system generated
+	// and needs to a complete frame before
+	// proceeding.
+	sync bool
+}
+
+type ChangeStage struct {
+	Stage Stage
+}
+
+type Stage uint8
+
+type Event interface {
+	ImplementsEvent()
+}
+
+type Input interface {
+	ImplementsInput()
+}
+
+const (
+	StageDead Stage = iota
+	StageInvisible
+	StageVisible
+)
+
+const (
+	inchPrDp = 1.0 / 160
+	mmPrDp   = 25.4 / 160
+	// monitorScale is the extra scale applied to
+	// monitor outputs to compensate for the extra
+	// viewing distance compared to phone and tables.
+	monitorScale = 1.50
+	// minDensity is the minimum pixels per dp to
+	// ensure font and ui legibility on low-dpi
+	// screens.
+	minDensity = 1.25
+)
+
+// extraArgs contains extra arguments to append to
+// os.Args. The arguments are separated with |.
+// Useful for running programs on mobiles where the
+// command line is not available.
+// Set it with the go tool linker flag -X.
+var extraArgs string
+
+var windows = make(chan *Window)
+
+func CreateWindow(opts WindowOptions) error {
+	if opts.Width.V <= 0 || opts.Height.V <= 0 {
+		panic("window width and height must be larger than 0")
+	}
+	return createWindow(opts)
+}
+
+func Windows() <-chan *Window {
+	return windows
+}
+
+func (l Stage) String() string {
+	switch l {
+	case StageDead:
+		return "StageDead"
+	case StageInvisible:
+		return "StageInvisible"
+	case StageVisible:
+		return "StageVisible"
+	default:
+		panic("unexpected Stage value")
+	}
+}
+
+func (_ Draw) ImplementsEvent()        {}
+func (_ ChangeStage) ImplementsEvent() {}
+
+func init() {
+	args := strings.Split(extraArgs, "|")
+	os.Args = append(os.Args, args...)
+}