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package layout
import (
"image"
"image/color"
"image/draw"
"log"
"volute/gui"
)
var _ Layout = Grid{}
// Grid represents a grid with rows and columns in each row.
// Each row can be a different length.
type Grid struct {
// Rows represents the number of childs of each row.
Rows []int
// Background represents the background of the grid as a uniform color.
Background color.Color
// Gap represents the grid gap, equal on all sides.
Gap int
// Split represents the way the space is divided among the columns in each row.
Split SplitFunc
// SplitRows represents the way the space is divided among the rows.
SplitRows SplitFunc
Margin int
Border int
BorderColor color.Color
// Flip represents the orientation of the grid.
// When false, rows are spread in the Y axis and columns in the X axis.
// When true, rows are spread in the X axis and columns in the Y axis.
Flip bool
}
func (g Grid) redraw(drw draw.Image, bounds image.Rectangle) {
col := g.Background
if col == nil {
col = color.Black
}
if g.Border > 0 {
bcol := g.BorderColor
if bcol == nil {
bcol = color.Black
}
draw.Draw(drw, bounds, image.NewUniform(bcol), image.ZP, draw.Src)
}
draw.Draw(drw, bounds.Inset(g.Border), image.NewUniform(col), image.ZP, draw.Src)
}
func (g Grid) Intercept(env gui.Env) gui.Env {
return RedrawIntercepter{g.redraw}.Intercept(env)
}
func (g Grid) Lay(bounds image.Rectangle) []image.Rectangle {
gap := g.Gap
rows := g.Rows
splitMain := g.Split
if splitMain == nil {
splitMain = EvenSplit
}
splitSec := g.SplitRows
if splitSec == nil {
splitSec = EvenSplit
}
margin := g.Margin
flip := g.Flip
if margin+gap < 0 {
log.Println("Grid goes out of bounds")
}
if margin+gap < g.Border {
log.Println("Grid border will not be shown properly")
}
ret := make([]image.Rectangle, 0)
// Sorry it's not very understandable
var H, W int
var mX, mY int
if flip {
H = bounds.Dx()
W = bounds.Dy()
mX = bounds.Min.Y
mY = bounds.Min.X
} else {
H = bounds.Dy()
W = bounds.Dx()
mX = bounds.Min.X
mY = bounds.Min.Y
}
rowsH := splitSec(len(rows), H-(gap*(len(rows)+1))-margin*2)
var X int
var Y int
Y = gap + mY + margin
for y, cols := range rows {
h := rowsH[y]
colsW := splitMain(cols, W-(gap*(cols+1))-margin*2)
X = gap + mX + margin
for _, w := range colsW {
var r image.Rectangle
if flip {
r = image.Rect(Y, X, Y+h, X+w)
} else {
r = image.Rect(X, Y, X+w, Y+h)
}
ret = append(ret, r)
X += gap + w
}
Y += gap + h
}
return ret
}
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