aerc/lib/ui/grid.go -rw-r--r-- 6.2 KiB View raw
                                                                                
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package ui

import (
	"fmt"
	"math"
	"sync"
	"sync/atomic"

	"github.com/gdamore/tcell"
)

type Grid struct {
	Invalidatable
	rows         []GridSpec
	rowLayout    []gridLayout
	columns      []GridSpec
	columnLayout []gridLayout
	invalid      bool

	// Protected by mutex
	cells []*GridCell
	mutex sync.RWMutex
}

const (
	SIZE_EXACT  = iota
	SIZE_WEIGHT = iota
)

// Specifies the layout of a single row or column
type GridSpec struct {
	// One of SIZE_EXACT or SIZE_WEIGHT
	Strategy int
	// If Strategy = SIZE_EXACT, this is the number of cells this row/col shall
	// occupy. If SIZE_WEIGHT, the space left after all exact rows/cols are
	// measured is distributed amonst the remainder weighted by this value.
	Size int
}

// Used to cache layout of each row/column
type gridLayout struct {
	Offset int
	Size   int
}

type GridCell struct {
	Row     int
	Column  int
	RowSpan int
	ColSpan int
	Content Drawable
	invalid atomic.Value // bool
}

func NewGrid() *Grid {
10 references
return &Grid{invalid: true} } // MakeGrid creates a grid with the specified number of columns and rows. Each // cell has a size of 1. func MakeGrid(numRows, numCols, rowStrategy, colStrategy int) *Grid {
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rows := make([]GridSpec, numRows) for i := 0; i < numRows; i++ { rows[i] = GridSpec{rowStrategy, 1} } cols := make([]GridSpec, numCols) for i := 0; i < numCols; i++ { cols[i] = GridSpec{colStrategy, 1} } return NewGrid().Rows(rows).Columns(cols) } func (cell *GridCell) At(row, col int) *GridCell {
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cell.Row = row cell.Column = col return cell } func (cell *GridCell) Span(rows, cols int) *GridCell { cell.RowSpan = rows cell.ColSpan = cols return cell } func (grid *Grid) Rows(spec []GridSpec) *Grid {
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grid.rows = spec return grid } func (grid *Grid) Columns(spec []GridSpec) *Grid {
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grid.columns = spec return grid } func (grid *Grid) Children() []Drawable {
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grid.mutex.RLock() defer grid.mutex.RUnlock() children := make([]Drawable, len(grid.cells)) for i, cell := range grid.cells { children[i] = cell.Content } return children } func (grid *Grid) Draw(ctx *Context) {
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invalid := grid.invalid if invalid { grid.reflow(ctx) } grid.mutex.RLock() defer grid.mutex.RUnlock() for _, cell := range grid.cells { cellInvalid := cell.invalid.Load().(bool) if !cellInvalid && !invalid { continue } rows := grid.rowLayout[cell.Row : cell.Row+cell.RowSpan] cols := grid.columnLayout[cell.Column : cell.Column+cell.ColSpan] x := cols[0].Offset y := rows[0].Offset width := 0 height := 0 for _, col := range cols { width += col.Size } for _, row := range rows { height += row.Size } if x+width > ctx.Width() { width = ctx.Width() - x } if y+height > ctx.Height() { height = ctx.Height() - y } if width <= 0 || height <= 0 { continue } subctx := ctx.Subcontext(x, y, width, height) cell.Content.Draw(subctx) } } func (grid *Grid) MouseEvent(localX int, localY int, event tcell.Event) {
3 references
switch event := event.(type) { case *tcell.EventMouse: invalid := grid.invalid grid.mutex.RLock() defer grid.mutex.RUnlock() for _, cell := range grid.cells { cellInvalid := cell.invalid.Load().(bool) if !cellInvalid && !invalid { continue } rows := grid.rowLayout[cell.Row : cell.Row+cell.RowSpan] cols := grid.columnLayout[cell.Column : cell.Column+cell.ColSpan] x := cols[0].Offset y := rows[0].Offset width := 0 height := 0 for _, col := range cols { width += col.Size } for _, row := range rows { height += row.Size } if x <= localX && localX < x+width && y <= localY && localY < y+height { switch content := cell.Content.(type) { case MouseableDrawableInteractive: content.MouseEvent(localX-x, localY-y, event) case Mouseable: content.MouseEvent(localX-x, localY-y, event) case MouseHandler: content.MouseEvent(localX-x, localY-y, event) } } } } } func (grid *Grid) reflow(ctx *Context) {
1 reference
grid.rowLayout = nil grid.columnLayout = nil flow := func(specs *[]GridSpec, layouts *[]gridLayout, extent int) { exact := 0 weight := 0 nweights := 0 for _, spec := range *specs { if spec.Strategy == SIZE_EXACT { exact += spec.Size } else if spec.Strategy == SIZE_WEIGHT { nweights += 1 weight += spec.Size } } offset := 0 remainingExact := 0 if weight > 0 { remainingExact = (extent - exact) % weight } for _, spec := range *specs { layout := gridLayout{Offset: offset} if spec.Strategy == SIZE_EXACT { layout.Size = spec.Size } else if spec.Strategy == SIZE_WEIGHT { proportion := float64(spec.Size) / float64(weight) size := proportion * float64(extent-exact) if remainingExact > 0 { extraExact := int(math.Ceil(proportion * float64(remainingExact))) layout.Size = int(math.Floor(size)) + extraExact remainingExact -= extraExact } else { layout.Size = int(math.Floor(size)) } } offset += layout.Size *layouts = append(*layouts, layout) } } flow(&grid.rows, &grid.rowLayout, ctx.Height()) flow(&grid.columns, &grid.columnLayout, ctx.Width()) grid.invalid = false } func (grid *Grid) invalidateLayout() {
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grid.invalid = true grid.DoInvalidate(grid) } func (grid *Grid) Invalidate() {
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grid.invalidateLayout() grid.mutex.RLock() for _, cell := range grid.cells { cell.Content.Invalidate() } grid.mutex.RUnlock() } func (grid *Grid) AddChild(content Drawable) *GridCell {
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cell := &GridCell{ RowSpan: 1, ColSpan: 1, Content: content, } grid.mutex.Lock() grid.cells = append(grid.cells, cell) grid.mutex.Unlock() cell.Content.OnInvalidate(grid.cellInvalidated) cell.invalid.Store(true) grid.invalidateLayout() return cell } func (grid *Grid) RemoveChild(content Drawable) {
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grid.mutex.Lock() for i, cell := range grid.cells { if cell.Content == content { grid.cells = append(grid.cells[:i], grid.cells[i+1:]...) break } } grid.mutex.Unlock() grid.invalidateLayout() } func (grid *Grid) cellInvalidated(drawable Drawable) {
1 reference
var cell *GridCell grid.mutex.RLock() for _, cell = range grid.cells { if cell.Content == drawable { break } cell = nil } grid.mutex.RUnlock() if cell == nil { panic(fmt.Errorf("Attempted to invalidate unknown cell")) } cell.invalid.Store(true) grid.DoInvalidate(grid) }