From 3a216b96b6a7c80275a2516e7de82d9b2ffc96df Mon Sep 17 00:00:00 2001
From: Clement Benard <contact@clementbenard.com>
Date: Thu, 4 Jul 2019 16:28:51 +0200
Subject: added layout basics

---
 layout/fixedgrid/fixedgrid.go | 88 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 layout/fixedgrid/fixedgrid.go

(limited to 'layout/fixedgrid/fixedgrid.go')

diff --git a/layout/fixedgrid/fixedgrid.go b/layout/fixedgrid/fixedgrid.go
new file mode 100644
index 0000000..a9fabf8
--- /dev/null
+++ b/layout/fixedgrid/fixedgrid.go
@@ -0,0 +1,88 @@
+package fixedgrid
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+
+	"github.com/faiface/gui"
+	"github.com/faiface/gui/layout"
+)
+
+type FixedGrid struct {
+	Columns    int
+	Rows       int
+	Background color.Color
+	Gap        int
+
+	*layout.Layout
+}
+
+func New(env gui.Env, options ...func(*FixedGrid)) *FixedGrid {
+	ret := &FixedGrid{
+		// Bounds:     image.ZR,
+		Background: image.Black,
+		Columns:    1,
+		Rows:       1,
+		Gap:        0,
+	}
+
+	for _, f := range options {
+		f(ret)
+	}
+
+	ret.Layout = layout.New(env, ret.layout, ret.redraw)
+	return ret
+}
+
+func (g *FixedGrid) layout(bounds image.Rectangle) map[string]image.Rectangle {
+	gap := g.Gap
+	cols := g.Columns
+	rows := g.Rows
+
+	w := (bounds.Dx() - (cols+1)*gap) / cols
+	h := (bounds.Dy() - (rows+1)*gap) / rows
+
+	ret := make(map[string]image.Rectangle)
+	X := gap + bounds.Min.X
+	Y := gap + bounds.Min.Y
+	for x := 0; x < cols; x++ {
+		for y := 0; y < rows; y++ {
+			ret[fmt.Sprintf("%d;%d", x, y)] = image.Rect(X, Y, X+w, Y+h)
+			Y += gap + h
+		}
+		Y = gap + bounds.Min.Y
+		X += gap + w
+	}
+
+	return ret
+}
+
+func Background(c color.Color) func(*FixedGrid) {
+	return func(grid *FixedGrid) {
+		grid.Background = c
+	}
+}
+
+func Gap(g int) func(*FixedGrid) {
+	return func(grid *FixedGrid) {
+		grid.Gap = g
+	}
+}
+
+func Columns(cols int) func(*FixedGrid) {
+	return func(grid *FixedGrid) {
+		grid.Columns = cols
+	}
+}
+
+func Rows(rows int) func(*FixedGrid) {
+	return func(grid *FixedGrid) {
+		grid.Rows = rows
+	}
+}
+
+func (g *FixedGrid) redraw(drw draw.Image, bounds image.Rectangle) {
+	draw.Draw(drw, bounds, image.NewUniform(g.Background), image.ZP, draw.Src)
+}
-- 
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