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-rw-r--r--ui/grid.go74
1 files changed, 74 insertions, 0 deletions
diff --git a/ui/grid.go b/ui/grid.go
new file mode 100644
index 0000000..fd0cab7
--- /dev/null
+++ b/ui/grid.go
@@ -0,0 +1,74 @@
+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)
+ }
+}