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package ui
import "fmt"
type Grid struct {
Rows []DimSpec
Columns []DimSpec
Cells []*GridCell
onInvalidate func(d Drawable)
}
const (
SIZE_EXACT = iota
SIZE_WEIGHT = iota
)
// Specifies the layout of a single row or column
type DimSpec struct {
// One of SIZE_EXACT or SIZE_WEIGHT
Strategy uint
// If Strategy = SIZE_EXACT, this is the number of cells this dim shall
// occupy. If SIZE_WEIGHT, the space left after all exact dims are measured
// is distributed amonst the remaining dims weighted by this value.
Size *uint
}
type GridCell struct {
Row uint
Column uint
RowSpan uint
ColSpan uint
Content Drawable
invalid bool
}
func (grid *Grid) Draw(ctx Context) {
// TODO
}
func (grid *Grid) OnInvalidate(onInvalidate func(d Drawable)) {
grid.onInvalidate = onInvalidate
}
func (grid *Grid) AddChild(cell *GridCell) {
grid.Cells = append(grid.Cells, cell)
cell.Content.OnInvalidate(grid.cellInvalidated)
cell.invalid = true
}
func (grid *Grid) RemoveChild(cell *GridCell) {
for i, _cell := range grid.Cells {
if _cell == cell {
grid.Cells = append(grid.Cells[:i], grid.Cells[i+1:]...)
break
}
}
}
func (grid *Grid) cellInvalidated(drawable Drawable) {
var cell *GridCell
for _, cell = range grid.Cells {
if cell.Content == drawable {
break
}
cell = nil
}
if cell == nil {
panic(fmt.Errorf("Attempted to invalidate unknown cell"))
}
cell.invalid = true
if grid.onInvalidate != nil {
grid.onInvalidate(grid)
}
}
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