diff options
Diffstat (limited to 'grid.go')
| -rw-r--r-- | grid.go | 104 |
1 files changed, 53 insertions, 51 deletions
@@ -9,7 +9,7 @@ import ( // Grid is a Control that arranges other Controls in a grid. // Grid is a very powerful container: it can position and size each Control in several ways and can (and must) have Controls added to it at any time, in any direction. // it can also have Controls spanning multiple rows and columns. -// +// // Each Control in a Grid has associated "expansion" and "alignment" values in both the X and Y direction. // Expansion determines whether all cells in the same row/column are given whatever space is left over after figuring out how big the rest of the Grid should be. // Alignment determines the position of a Control relative to its cell after computing the above. @@ -31,6 +31,7 @@ type Grid interface { // Align represents the alignment of a Control in its cell of a Grid. type Align uint + const ( LeftTop Align = iota Center @@ -40,6 +41,7 @@ const ( // Side represents a side of a Control to add other Controls to a Grid to. type Side uint + const ( West Side = iota East @@ -49,39 +51,39 @@ const ( ) type grid struct { - controls []gridCell - indexof map[Control]int - prev int - parent *controlParent + controls []gridCell + indexof map[Control]int + prev int + parent *controlParent - xmax int - ymax int + xmax int + ymax int } type gridCell struct { - control Control - xexpand bool - xalign Align - yexpand bool - yalign Align - xspan int - yspan int + control Control + xexpand bool + xalign Align + yexpand bool + yalign Align + xspan int + yspan int - x int - y int + x int + y int - finalx int - finaly int - finalwidth int - finalheight int - prefwidth int - prefheight int + finalx int + finaly int + finalwidth int + finalheight int + prefwidth int + prefheight int } // NewGrid creates a new Grid with no Controls. func NewGrid() Grid { return &grid{ - indexof: map[Control]int{}, + indexof: map[Control]int{}, } } @@ -105,10 +107,10 @@ func (g *grid) reorigin() { for i := range g.controls { g.controls[i].x += xmin g.controls[i].y += ymin - if g.xmax < g.controls[i].x + g.controls[i].xspan { + if g.xmax < g.controls[i].x+g.controls[i].xspan { g.xmax = g.controls[i].x + g.controls[i].xspan } - if g.ymax < g.controls[i].y + g.controls[i].yspan { + if g.ymax < g.controls[i].y+g.controls[i].yspan { g.ymax = g.controls[i].y + g.controls[i].yspan } } @@ -119,13 +121,13 @@ func (g *grid) Add(control Control, nextTo Control, side Side, xexpand bool, xal panic(fmt.Errorf("invalid span %dx%d given to Grid.Add()", xspan, yspan)) } cell := gridCell{ - control: control, - xexpand: xexpand, - xalign: xalign, - yexpand: yexpand, - yalign: yalign, - xspan: xspan, - yspan: yspan, + control: control, + xexpand: xexpand, + xalign: xalign, + yexpand: yexpand, + yalign: yalign, + xspan: xspan, + yspan: yspan, } if g.parent != nil { control.setParent(g.parent) @@ -176,8 +178,8 @@ func (g *grid) mkgrid() (gg [][]int, colwidths []int, rowheights []int) { } } for i := range g.controls { - for y := g.controls[i].y; y < g.controls[i].y + g.controls[i].yspan; y++ { - for x := g.controls[i].x; x < g.controls[i].x + g.controls[i].xspan; x++ { + for y := g.controls[i].y; y < g.controls[i].y+g.controls[i].yspan; y++ { + for x := g.controls[i].x; x < g.controls[i].x+g.controls[i].xspan; x++ { gg[y][x] = i } } @@ -241,28 +243,28 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat for i := range g.controls { if g.controls[i].xexpand && g.controls[i].xspan != 1 { do := true - for x := g.controls[i].x; x < g.controls[i].x + g.controls[i].xspan; x++ { + for x := g.controls[i].x; x < g.controls[i].x+g.controls[i].xspan; x++ { if xexpand[x] { do = false break } } if do { - for x := g.controls[i].x; x < g.controls[i].x + g.controls[i].xspan; x++ { + for x := g.controls[i].x; x < g.controls[i].x+g.controls[i].xspan; x++ { xexpand[x] = true } } } if g.controls[i].yexpand && g.controls[i].yspan != 1 { do := true - for y := g.controls[i].y; y < g.controls[i].y + g.controls[i].yspan; y++ { + for y := g.controls[i].y; y < g.controls[i].y+g.controls[i].yspan; y++ { if yexpand[y] { do = false break } } if do { - for y := g.controls[i].y; y < g.controls[i].y + g.controls[i].yspan; y++ { + for y := g.controls[i].y; y < g.controls[i].y+g.controls[i].yspan; y++ { yexpand[y] = true } } @@ -311,7 +313,7 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat prev := -1 for x := 0; x < g.xmax; x++ { i := gg[y][x] - if i != -1 && y == g.controls[i].y { // don't repeat this step if the control spans vertically + if i != -1 && y == g.controls[i].y { // don't repeat this step if the control spans vertically if i != prev { g.controls[i].finalx = curx } else { @@ -328,7 +330,7 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat prev := -1 for y := 0; y < g.ymax; y++ { i := gg[y][x] - if i != -1 && x == g.controls[i].x { // don't repeat this step if the control spans horizontally + if i != -1 && x == g.controls[i].x { // don't repeat this step if the control spans horizontally if i != prev { g.controls[i].finaly = cury } else { @@ -351,7 +353,7 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat case Center: g.controls[i].finalx += (g.controls[i].finalwidth - g.controls[i].prefwidth) / 2 } - g.controls[i].finalwidth = g.controls[i].prefwidth // for all three + g.controls[i].finalwidth = g.controls[i].prefwidth // for all three } if g.controls[i].yalign != Fill { switch g.controls[i].yalign { @@ -360,7 +362,7 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat case Center: g.controls[i].finaly += (g.controls[i].finalheight - g.controls[i].prefheight) / 2 } - g.controls[i].finalheight = g.controls[i].prefheight // for all three + g.controls[i].finalheight = g.controls[i].prefheight // for all three } } @@ -370,17 +372,17 @@ func (g *grid) allocate(x int, y int, width int, height int, d *sizing) (allocat for _, ycol := range gg { current = nil for _, i := range ycol { - if i != -1 { // treat empty cells like spaces + if i != -1 { // treat empty cells like spaces as := g.controls[i].control.allocate( - g.controls[i].finalx + x, g.controls[i].finaly + y, + g.controls[i].finalx+x, g.controls[i].finaly+y, g.controls[i].finalwidth, g.controls[i].finalheight, d) - if current != nil { // connect first left to first right + if current != nil { // connect first left to first right current.neighbor = g.controls[i].control } if len(as) != 0 { - current = as[0] // next left is first subwidget + current = as[0] // next left is first subwidget } else { - current = nil // spaces don't have allocation data + current = nil // spaces don't have allocation data } allocations = append(allocations, as...) } @@ -409,10 +411,10 @@ func (g *grid) preferredSize(d *sizing) (width, height int) { } w, h := g.controls[i].control.preferredSize(d) // allot equal space in the presence of spanning to keep things sane - if colwidths[x] < w / g.controls[i].xspan { + if colwidths[x] < w/g.controls[i].xspan { colwidths[x] = w / g.controls[i].xspan } - if rowheights[y] < h / g.controls[i].yspan { + if rowheights[y] < h/g.controls[i].yspan { rowheights[y] = h / g.controls[i].yspan } // save these for step 6 @@ -432,8 +434,8 @@ func (g *grid) preferredSize(d *sizing) (width, height int) { } // and that's it; just account for padding - return colwidth + (g.xmax - 1) * d.xpadding, - rowheight + (g.ymax - 1) * d.ypadding + return colwidth + (g.xmax-1)*d.xpadding, + rowheight + (g.ymax-1)*d.ypadding } func (g *grid) commitResize(a *allocation, d *sizing) { |