Adjusted Grid to be like new Stack. Automatically made Labels in Grids filling.

redo/grid.go

@@ -6,8 +6,6 @@ import (
 	"fmt"
 )
 
-// TODO Grids on GTK+ will not respect non-standalone Labels unless SetFilling()
-
 // A Grid arranges Controls in a two-dimensional grid.
 // The height of each row and the width of each column is the maximum preferred height and width (respectively) of all the controls in that row or column (respectively).
 // Controls are aligned to the top left corner of each cell.
@@ -16,8 +14,23 @@ import (
 // One Control can be marked as "stretchy": when the Window containing the Grid is resized, the cell containing that Control resizes to take any remaining space; its row and column are adjusted accordingly (so other filling controls in the same row and column will fill to the new height and width, respectively).
 // A stretchy Control implicitly fills its cell.
 // All cooridnates in a Grid are given in (row,column) form with (0,0) being the top-left cell.
-type Grid struct {
-	created                  bool
+// 
+// As a special rule, to ensure proper appearance, non-standalone Labels are automatically made filling.
+type Grid interface {
+	Control
+
+	// SetFilling marks the given Control of the Grid as filling its cell instead of staying at its preferred size.
+	// It panics if the given coordinate is invalid.
+	SetFilling(row int, column int)
+
+	// SetStretchy marks the given Control of the Grid as stretchy.
+	// Stretchy implies filling.
+	// Only one control can be stretchy per Grid; calling SetStretchy multiple times merely changes which control is stretchy.
+	// It panics if the given coordinate is invalid.
+	SetStretchy(row int, column int)
+}
+
+type grid struct {
 	controls                 [][]Control
 	filling                  [][]bool
 	stretchyrow, stretchycol int
@@ -33,7 +46,7 @@ type Grid struct {
 // 		control00, control01, control02,
 // 		control10, control11, control12,
 // 		control20, control21, control22)
-func NewGrid(nPerRow int, controls ...Control) *Grid {
+func NewGrid(nPerRow int, controls ...Control) Grid {
 	if len(controls)%nPerRow != 0 {
 		panic(fmt.Errorf("incomplete grid given to NewGrid() (not enough controls to evenly divide %d controls into rows of %d controls each)", len(controls), nPerRow))
 	}
@@ -50,10 +63,13 @@ func NewGrid(nPerRow int, controls ...Control) *Grid {
 		ch[row] = make([]int, nPerRow)
 		for x := 0; x < nPerRow; x++ {
 			cc[row][x] = controls[i]
+			if l, ok := controls[i].(Label); ok && !l.isStandalone() {
+				cf[row][x] = true
+			}
 			i++
 		}
 	}
-	return &Grid{
+	return &grid{
 		controls:    cc,
 		filling:     cf,
 		stretchyrow: -1,
@@ -65,28 +81,14 @@ func NewGrid(nPerRow int, controls ...Control) *Grid {
 	}
 }
 
-// SetFilling marks the given Control of the Grid as filling its cell instead of staying at its preferred size.
-// This function cannot be called after the Window that contains the Grid has been created.
-// It panics if the given coordinate is invalid.
-func (g *Grid) SetFilling(row int, column int) {
-	if g.created {
-		panic(fmt.Errorf("Grid.SetFilling() called after window create"))
-	}
+func (g *grid) SetFilling(row int, column int) {
 	if row < 0 || column < 0 || row > len(g.filling) || column > len(g.filling[row]) {
 		panic(fmt.Errorf("coordinate (%d,%d) out of range passed to Grid.SetFilling()", row, column))
 	}
 	g.filling[row][column] = true
 }
 
-// SetStretchy marks the given Control of the Grid as stretchy.
-// Stretchy implies filling.
-// Only one control can be stretchy per Grid; calling SetStretchy multiple times merely changes which control is stretchy.
-// This function cannot be called after the Window that contains the Grid has been created.
-// It panics if the given coordinate is invalid.
-func (g *Grid) SetStretchy(row int, column int) {
-	if g.created {
-		panic(fmt.Errorf("Grid.SetFilling() called after window create"))
-	}
+func (g *grid) SetStretchy(row int, column int) {
 	if row < 0 || column < 0 || row > len(g.filling) || column > len(g.filling[row]) {
 		panic(fmt.Errorf("coordinate (%d,%d) out of range passed to Grid.SetStretchy()", row, column))
 	}
@@ -95,27 +97,15 @@ func (g *Grid) SetStretchy(row int, column int) {
 	// don't set filling here in case we call SetStretchy() multiple times; the filling is committed in make() below
 }
 
-func (g *Grid) make(window *sysData) error {
-	// commit filling for the stretchy control now (see SetStretchy() above)
-	if g.stretchyrow != -1 && g.stretchycol != -1 {
-		g.filling[g.stretchyrow][g.stretchycol] = true
-	} else if (g.stretchyrow == -1 && g.stretchycol != -1) || // sanity check
-		(g.stretchyrow != -1 && g.stretchycol == -1) {
-		panic(fmt.Errorf("internal inconsistency in Grid: stretchy (%d,%d) impossible (one component, not both, is -1/no stretchy control) in Grid.make()", g.stretchyrow, g.stretchycol))
-	}
-	for row, xcol := range g.controls {
-		for col, c := range xcol {
-			err := c.make(window)
-			if err != nil {
-				return fmt.Errorf("error adding control (%d,%d) to Grid: %v", row, col, err)
-			}
+func (g *grid) setParent(parent *controlParent) {
+	for _, col := range s.controls {
+		for _, c := range col {
+			c.setParent(parent)
 		}
 	}
-	g.created = true
-	return nil
 }
 
-func (g *Grid) allocate(x int, y int, width int, height int, d *sysSizeData) (allocations []*allocation) {
+func (g *grid) allocate(x int, y int, width int, height int, d *sysSizeData) (allocations []*allocation) {
 	max := func(a int, b int) int {
 		if a > b {
 			return a
@@ -125,7 +115,9 @@ func (g *Grid) allocate(x int, y int, width int, height int, d *sysSizeData) (al
 
 	var current *allocation		// for neighboring
 
-	// TODO return if nControls == 0?
+	if len(controls) == 0 {
+		return nil
+	}
 	// 0) inset the available rect by the needed padding
 	width -= (len(g.colwidths) - 1) * d.xpadding
 	height -= (len(g.rowheights) - 1) * d.ypadding
@@ -191,7 +183,7 @@ func (g *Grid) allocate(x int, y int, width int, height int, d *sysSizeData) (al
 }
 
 // filling and stretchy are ignored for preferred size calculation
-func (g *Grid) preferredSize(d *sysSizeData) (width int, height int) {
+func (g *grid) preferredSize(d *sysSizeData) (width int, height int) {
 	max := func(a int, b int) int {
 		if a > b {
 			return a
@@ -228,10 +220,10 @@ func (g *Grid) preferredSize(d *sysSizeData) (width int, height int) {
 	return width, height
 }
 
-func (g *Grid) commitResize(c *allocation, d *sysSizeData) {
+func (g *grid) commitResize(c *allocation, d *sysSizeData) {
 	// this is to satisfy Control; nothing to do here
 }
 
-func (g *Grid) getAuxResizeInfo(d *sysSizeData) {
+func (g *grid) getAuxResizeInfo(d *sysSizeData) {
 	// this is to satisfy Control; nothing to do here
 }