Simplified Grid's code greatly, making it more correct in the process. Also renamed h/vexpand/align to x/yexpand/align for simplicity.
This commit is contained in:
Pietro Gagliardi
parent
c91cbf12b8
commit
2731cf3ae0
202
grid.go
202
grid.go
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@ -17,7 +17,7 @@ type Grid interface {
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// Otherwise, it is placed relative to nextTo.
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// If nextTo is nil, it is placed next to the previously added Control,
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// The effect of adding the same Control multiple times is undefined, as is the effect of adding a Control next to one not present in the Grid.
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Add(control Control, nextTo Control, side Side, hexpand bool, halign Align, vexpand bool, valign Align)
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Add(control Control, nextTo Control, side Side, xexpand bool, xalign Align, yexpand bool, yalign Align)
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}
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// Align represents the alignment of a Control in its cell of a Grid.
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@ -49,14 +49,14 @@ type grid struct {
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// for allocate() and preferredSize()
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xoff, yoff int
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xmax, ymax int
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grid [][]gridCellAllocation
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grid [][]Control
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}
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type gridCell struct {
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hexpand bool
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halign Align
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vexpand bool
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valign Align
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xexpand bool
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xalign Align
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yexpand bool
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yalign Align
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neighbors [nSides]Control
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// for allocate() and preferredSize()
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@ -74,12 +74,12 @@ func NewGrid() Grid {
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}
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}
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func (g *grid) Add(control Control, nextTo Control, side Side, hexpand bool, halign Align, vexpand bool, valign Align) {
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func (g *grid) Add(control Control, nextTo Control, side Side, xexpand bool, xalign Align, yexpand bool, yalign Align) {
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cell := &gridCell{
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hexpand: hexpand,
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halign: halign,
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vexpand: vexpand,
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valign: valign,
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xexpand: xexpand,
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xalign: xalign,
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yexpand: yexpand,
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yalign: yalign,
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}
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// if this is the first control, just add it in directly
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if len(g.controls) != 0 {
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@ -135,12 +135,6 @@ func (g *grid) trasverse(c Control, x int, y int) {
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}
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}
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type gridCellAllocation struct {
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width int
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height int
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c Control
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}
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func (g *grid) buildGrid() {
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// thanks to http://programmers.stackexchange.com/a/254968/147812
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// before we do anything, reset the visited bits
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@ -170,10 +164,10 @@ func (g *grid) buildGrid() {
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g.xmax++
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g.ymax++
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// and finally build the matrix
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g.grid = make([][]gridCellAllocation, g.ymax)
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g.grid = make([][]Control, g.ymax)
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for y := 0; y < g.ymax; y++ {
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g.grid[y] = make([]gridCellAllocation, g.xmax)
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// the field c is assigned below for efficiency
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g.grid[y] = make([]Control, g.xmax)
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// the elements are assigned below for efficiency
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}
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}
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@ -188,88 +182,60 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat
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width -= d.xpadding * g.xmax
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height -= d.ypadding * g.ymax
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// 2) for every control that doesn't expand, set the width of each cell of its column/height of each cell of its row to the largest such
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nhexpand := make([]bool, g.xmax)
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nvexpand := make([]bool, g.ymax)
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// 2) for every control, set the width of each cell of its column/height of each cell of its row to the largest such
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colwidths := make([]int, g.xmax)
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rowheights := make([]int, g.ymax)
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colxexpand := make([]bool, g.xmax)
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rowyexpand := make([]bool, g.ymax)
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for c, cell := range g.controls {
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width, height := c.preferredSize(d)
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cell.width = width
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cell.height = height
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if !cell.hexpand {
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g.grid[cell.gridy][cell.gridx].width = width
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} else {
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nhexpand[cell.gridx] = true
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if colwidths[cell.gridx] < width {
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colwidths[cell.gridx] = width
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}
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if !cell.vexpand {
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g.grid[cell.gridy][cell.gridx].height = height
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} else {
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nvexpand[cell.gridy] = true
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if rowheights[cell.gridy] < height {
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rowheights[cell.gridy] = height
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}
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g.grid[cell.gridy][cell.gridx].c = c
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}
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// cells on the same row have the same height
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for y := 0; y < g.ymax; y++ {
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max := 0
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for x := 0; x < g.xmax; x++ {
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if max < g.grid[y][x].height {
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max = g.grid[y][x].height
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}
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if cell.xexpand {
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colxexpand[cell.gridx] = true
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}
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for x := 0; x < g.xmax; x++ {
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g.grid[y][x].height = max
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}
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}
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// cells on the same column have the same width
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for x := 0; x < g.xmax; x++ {
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max := 0
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for y := 0; y < g.ymax; y++ {
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if max < g.grid[y][x].width {
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max = g.grid[y][x].width
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}
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}
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for y := 0; y < g.ymax; y++ {
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g.grid[y][x].width = max
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if cell.yexpand {
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rowyexpand[cell.gridy] = true
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}
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g.grid[cell.gridy][cell.gridx] = c
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}
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// 3) distribute the remaining space equally to expanding cells, adjusting widths and heights as needed
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nh := 0
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for x, b := range nhexpand {
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if b {
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nh++
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nexpand := 0
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for x, expand := range colxexpand {
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if expand {
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nexpand++
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} else { // column width known; subtract it
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width -= g.grid[0][x].width
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width -= colwidths[x]
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}
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}
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if nh > 0 {
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h := width / nh
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for y, b := range nhexpand {
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if b {
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for x := 0; x < g.xmax; x++ {
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if g.grid[y][x].width < h {
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g.grid[y][x].width = h
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}
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}
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if nexpand > 0 {
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w := width / nexpand
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for x, expand := range colxexpand {
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if expand {
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colwidths[x] = w
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}
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}
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}
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nv := 0
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for y, b := range nvexpand {
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if b {
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nv++
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} else { // column height known; subtract it
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height -= g.grid[y][0].height
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nexpand = 0
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for y, expand := range rowyexpand {
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if expand {
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nexpand++
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} else { // row height known; subtract it
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height -= rowheights[y]
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}
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}
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if nv > 0 {
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v := height / nv
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for x, b := range nvexpand {
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if b {
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for y := 0; y < g.ymax; y++ {
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if g.grid[y][x].height < v {
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g.grid[y][x].height = v
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}
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}
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if nexpand > 0 {
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h := height / nexpand
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for y, expand := range rowyexpand {
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if expand {
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rowheights[y] = h
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}
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}
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}
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@ -278,30 +244,30 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat
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// 4) handle alignment
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for _, cell := range g.controls {
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if cell.hexpand {
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switch cell.halign {
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if cell.xexpand {
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switch cell.xalign {
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case LeftTop:
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// do nothing; this is the default
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case Center:
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case RightBottom:
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// TODO
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case Fill:
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cell.width = g.grid[cell.gridy][cell.gridx].width
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cell.width = colwidths[cell.gridx]
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default:
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panic(fmt.Errorf("invalid halign %d in Grid.allocate()", cell.halign))
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panic(fmt.Errorf("invalid xalign %d in Grid.allocate()", cell.xalign))
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}
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}
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if cell.vexpand {
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switch cell.valign {
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if cell.yexpand {
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switch cell.yalign {
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case LeftTop:
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// do nothing; this is the default
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case Center:
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case RightBottom:
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// TODO
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case Fill:
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cell.height = g.grid[cell.gridy][cell.gridx].height
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cell.height = rowheights[cell.gridy]
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default:
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panic(fmt.Errorf("invalid valign %d in Grid.allocate()", cell.valign))
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panic(fmt.Errorf("invalid yalign %d in Grid.allocate()", cell.yalign))
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}
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}
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}
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@ -312,11 +278,11 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat
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startx := x
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for row, xcol := range g.grid {
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current = nil
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for col, ca := range xcol {
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cell := g.controls[ca.c]
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as := ca.c.allocate(x, y, cell.width, cell.height, d)
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for col, c := range xcol {
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cell := g.controls[c]
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as := c.allocate(x, y, cell.width, cell.height, d)
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if current != nil { // connect first left to first right
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current.neighbor = ca.c
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current.neighbor = c
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}
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if len(as) != 0 {
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current = as[0] // next left is first subwidget
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@ -324,10 +290,10 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat
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current = nil // spaces don't have allocation data
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}
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allocations = append(allocations, as...)
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x += g.grid[0][col].width + d.xpadding
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x += colwidths[col] + d.xpadding
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}
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x = startx
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y += g.grid[row][0].height + d.ypadding
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y += rowheights[row] + d.ypadding
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}
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return allocations
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@ -343,38 +309,28 @@ func (g *grid) preferredSize(d *sizing) (width, height int) {
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g.buildGrid()
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// 2) for every control (including those that don't expand), set the width of each cell of its column/height of each cell of its row to the largest such
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colwidths := make([]int, g.xmax)
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rowheights := make([]int, g.ymax)
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for c, cell := range g.controls {
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width, height := c.preferredSize(d)
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g.grid[cell.gridy][cell.gridx].width = width
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g.grid[cell.gridy][cell.gridx].height = height
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}
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// cells on the same row have the same height
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maxy := 0
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for y := 0; y < g.ymax; y++ {
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max := 0
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for x := 0; x < g.xmax; x++ {
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if max < g.grid[y][x].height {
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max = g.grid[y][x].height
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}
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cell.width = width
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cell.height = height
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if colwidths[cell.gridx] < width {
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colwidths[cell.gridx] = width
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}
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for x := 0; x < g.xmax; x++ {
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g.grid[y][x].height = max
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if rowheights[cell.gridy] < height {
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rowheights[cell.gridy] = height
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}
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maxy += max
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}
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// cells on the same column have the same width
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// 3) and sum the widths and heights
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maxx := 0
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for x := 0; x < g.xmax; x++ {
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max := 0
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for y := 0; y < g.ymax; y++ {
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if max < g.grid[y][x].width {
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max = g.grid[y][x].width
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}
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}
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for y := 0; y < g.ymax; y++ {
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g.grid[y][x].width = max
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}
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maxx += max
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for _, x := range colwidths {
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maxx += x
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}
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maxy := 0
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for _, y := range rowheights {
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maxy += y
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}
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// and that's it really; just discount the padding
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