rand/cmd/rand-gui/ui.go

package main

// helper functions for UI

import (
	"time"

	//"github.com/golang-ui/nuklear/nk"
	"gitlab.wow.st/gmp/nuklear/nk"
)

const (
        initWidth = 600
        initHeight = 400

        maxVertexBuffer = 512 * 1024
        maxElementBuffer = 128 * 1024

        frametime = time.Second / 30

	rows = 3
)

var (
	white nk.Color
        atlas *nk.FontAtlas
        sansFont *nk.Font
        sansFontHandle *nk.UserFont
        ctx *nk.Context
	width, height int
	y, lastY float32
)

func uiInit() {
	platformInit()
	mkWin()
	white = nk.NkRgba(255,255,255,255)
        table := []nk.Color{
	nk.NkRgba(70, 70, 70, 255), // NK_COLOR_TEXT
        nk.NkRgba(175, 175, 175, 255), // NK_COLOR_WINDOW
	nk.NkRgba(175, 175, 175, 255), // NK_COLOR_HEADER
	nk.NkRgba(0, 0, 0, 255), // NK_COLOR_BORDER
	nk.NkRgba(185, 185, 185, 255), // NK_COLOR_BUTTON
	nk.NkRgba(170, 170, 170, 255), // NK_COLOR_BUTTON_HOVER
	nk.NkRgba(160, 160, 160, 255), // NK_COLOR_BUTTON_ACTIVE
	nk.NkRgba(150, 150, 150, 255), // NK_COLOR_TOGGLE
	nk.NkRgba(120, 120, 120, 255), // NK_COLOR_TOGGLE_HOVER
	nk.NkRgba(175, 175, 175, 255), // NK_COLOR_TOGGLE_CURSOR
	nk.NkRgba(190, 190, 190, 255), // NK_COLOR_SELECT
	nk.NkRgba(175, 175, 175, 255), // NK_COLOR_SELECT_ACTIVE
	nk.NkRgba(190, 190, 190, 255), // NK_COLOR_SLIDER
	nk.NkRgba(80, 80, 80, 255), // NK_COLOR_SLIDER_CURSOR
	nk.NkRgba(70, 70, 70, 255), // NK_COLOR_SLIDER_CURSOR_HOVER
	nk.NkRgba(60, 60, 60, 255), // NK_COLOR_SLIDER_CURSOR_ACTIVE
	nk.NkRgba(175, 175, 175, 255), // NK_COLOR_PROPERTY
	nk.NkRgba(150, 150, 150, 255), // NK_COLOR_EDIT
	nk.NkRgba(0, 0, 0, 255), // NK_COLOR_EDIT_CURSOR
	nk.NkRgba(175, 175, 175, 255), // NK_COLOR_COMBO
	nk.NkRgba(160, 160, 160, 255), // NK_COLOR_CHART
	nk.NkRgba(45, 45, 45, 255), // NK_COLOR_CHART_COLOR
	nk.NkRgba( 255, 0, 0, 255), // NK_COLOR_CHART_COLOR_HIGHLIGHT
	nk.NkRgba(180, 180, 180, 255), // NK_COLOR_SCROLLBAR
	nk.NkRgba(140, 140, 140, 255), // NK_COLOR_SCROLLBAR_CURSOR
	nk.NkRgba(150, 150, 150, 255), // NK_COLOR_SCROLLBAR_CURSOR_HOVER
	nk.NkRgba(160, 160, 160, 255), // NK_COLOR_SCROLLBAR_CURSOR_ACTIVE
	nk.NkRgba(180, 180, 180, 255), // NK_COLOR_TAB_HEADER
	}
	_ = table
	// this scheme comes out all white on Android.
        //nk.NkStyleFromTable(ctx, table)
}

func loadFont() {
	atlas = nk.NewFontAtlas()
	nk.NkFontStashBegin(&atlas)
	sansFont = nk.NkFontAtlasAddFromBytes(atlas, MustAsset("assets/DroidSans.ttf"), fontSize, nil)
	nk.NkFontStashEnd()
	if sansFont != nil {
		sansFontHandle = sansFont.Handle()
		nk.NkStyleSetFont(ctx, sansFontHandle)
	}
	log(Info, "Font added")
}

func row(i int32,hs ...int) {
	h := 1
	if len(hs) > 0 {
		h = hs[0]
	}
	nk.NkLayoutRowStatic(ctx,float32(height / (h * rows)),int32(float32(-i)+float32(width-25)/float32(i)),i)
}

func button(text string) bool {
	return nk.NkButtonLabel(ctx,text) > 0
}

func label(text string, optss ...nk.Flags) {
	var opts nk.Flags
	if len(optss) > 0 {
		opts = optss[0]
	} else {
		opts = nk.TextAlignLeft | nk.TextAlignMiddle
	}
	nk.NkLabel(ctx,text,opts)
}

func editstring(buf []byte) {
	nk.NkEditFocus(ctx, nk.EditBox)
	nk.NkEditStringZeroTerminated(ctx, nk.EditBox, buf, int32(len(buf)), nk.NkFilterAscii)
}

func uiBegin() bool {
	nk.NkPlatformNewFrame()
//	NewFrame()
	lastY = y

	width, height = GetSize()

	bounds := nk.NkRect(0,0,float32(width),float32(height))
	ret := nk.NkBegin(ctx, "Rand", bounds, nk.WindowScrollAutoHide) > 0
	wpos := nk.NkWidgetPosition(ctx)
	lastY = y
	y = wpos.Y()
	return ret
}

func uiEnd() {
	nk.NkEnd(ctx)
	nk.NkPlatformRender(nk.AntiAliasingOn, maxVertexBuffer, maxElementBuffer)
	SwapBuffers()
}