/
GridLayoutPane.go
135 lines (110 loc) · 3.25 KB
/
GridLayoutPane.go
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package layouts
import "image"
import "github.com/ctlod/go.swtk"
import "log"
type GridLayoutPane struct {
thePane swtk.Pane
renderer swtk.Renderer
children []swtk.Pane
coords map[swtk.Pane]*image.Point
sizes map[swtk.Pane]*image.Point
paneCell map[swtk.Pane]*image.Point
gridCell map[image.Point]swtk.Pane
gridAlign map[image.Point]swtk.Alignmenter
gridSize image.Point
size image.Point
}
func NewGridLayoutPane() *GridLayoutPane {
pn := new(GridLayoutPane)
pn.sizes = make(map[swtk.Pane]*image.Point)
pn.paneCell = make(map[swtk.Pane]*image.Point)
pn.gridCell = make(map[image.Point]swtk.Pane)
pn.gridAlign = make(map[image.Point]swtk.Alignmenter)
pn.gridSize = image.Point{0, 0}
return pn
}
func (pn *GridLayoutPane) RegisterRenderer(wr swtk.Renderer) {
pn.renderer = wr
}
func (pn *GridLayoutPane) HandleResizeEvent(re swtk.ResizeEvent) {
pn.size = re.Size
for _, child := range pn.children {
cell := pn.paneCell[child]
//work out width of current cell
gc_w := re.Size.X / pn.gridSize.X
gc_h := re.Size.Y / pn.gridSize.Y
//work out origin of current cell
origin := image.Point{gc_w * cell.X, gc_h * cell.Y}
size := image.Point{gc_w, gc_h}
min, max := child.MinMax()
if min.X > size.X {
size.X = 0
} else if max.X != 0 && max.X < size.X {
size.X = max.X
}
if min.Y > size.Y {
size.Y = 0
} else if max.Y != 0 && max.Y < size.Y {
size.Y = max.Y
}
a := pn.gridAlign[*cell]
//Align horizontally
if (size.X < gc_w) {
if (a == swtk.AlignCenter || a== swtk.AlignTop || a == swtk.AlignBottom) {
origin.X = origin.X + (gc_w - size.X) / 2
} else if (a == swtk.AlignCenterRight || a== swtk.AlignTopRight || a == swtk.AlignBottomRight) {
origin.X = origin.X + (gc_w - size.X)
}
}
//Align Vertically
if (size.Y < gc_h) {
if (a == swtk.AlignCenter || a== swtk.AlignCenterLeft || a == swtk.AlignCenterRight) {
origin.Y = origin.Y + (gc_h - size.Y) / 2
} else if (a == swtk.AlignBottom || a== swtk.AlignBottomLeft || a == swtk.AlignBottomRight) {
origin.Y = origin.Y + (gc_h - size.Y)
}
}
//Work out view to tell child
p := image.Rect(0, 0, size.X, size.Y).Add(origin)
p = p.Intersect(re.View)
pn.renderer.SetLocation(swtk.PaneCoords{child, p.Min, image.Point{p.Dx(), p.Dy()}})
child.SetSize(swtk.ResizeEvent{size, p.Sub(origin)})
}
}
func (pn *GridLayoutPane) HandleCloseEvent() {
for _, c := range pn.children {
c.Close()
}
}
func (lp *GridLayoutPane) SetPane(pn swtk.Pane) {
lp.thePane = pn
}
func (pn *GridLayoutPane) AddPane(pane swtk.Pane, x, y int) {
if pn.paneCell[pane] != nil {
log.Println("GridLayoutPane - Pane already exists: ", pane, x, y)
return
}
if (pn.gridSize.X <= x) {
pn.gridSize.X = x + 1
}
if (pn.gridSize.Y <= y) {
pn.gridSize.Y = y + 1
}
pn.children = append(pn.children, pane)
p := image.Point{x, y}
pn.paneCell[pane] = &p
pn.gridCell[p] = pane
pn.gridAlign[p] = swtk.AlignCenter
pn.renderer.RegisterPane(pane, pn.thePane)
if pane.LayoutPane() != nil {
pane.LayoutPane().RegisterRenderer(pn.renderer)
}
if pane.DisplayPane() != nil {
pane.DisplayPane().SetRenderer(pn.renderer)
}
go pane.PaneHandler()
}
func (pn *GridLayoutPane) SetAlignment(p swtk.Pane, a swtk.Alignmenter) {
c := pn.paneCell[p]
pn.gridAlign[*c] = a
}