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