start correctly handling grid placement

Signed-off-by: Jeff Carr <jcarr@wit.com>

README-goreadme.md

@@ -164,7 +164,7 @@ This goroutine can be used like a watchdog timer
 
 This struct can be used with the go-arg package
 
-### type [Node](/structs.go#L55)
+### type [Node](/structs.go#L57)
 
 `type Node struct { ... }`
 

common.go

@@ -67,15 +67,10 @@ func (n *Node) SetText(text string) *Node{
 	return n
 }
 
-func (n *Node) SetNext(x int, y int) {
-	n.NextX = x
-	n.NextY = y
-	log(debugError, "SetNext() x,y =", n.NextX, n.NextY)
-	log(debugError, "SetNext() x,y =", n.NextX, n.NextY)
-	log(debugError, "SetNext() x,y =", n.NextX, n.NextY)
-	log(debugError, "SetNext() x,y =", n.NextX, n.NextY)
-	log(debugError, "SetNext() x,y =", n.NextX, n.NextY)
-	log(debugError, "SetNext() x,y =", n.NextX, n.NextY)
+func (n *Node) SetNext(w int, h int) {
+	n.NextW = w
+	n.NextH = h
+	log(debugNow, "SetNext() w,h =", n.NextW, n.NextH)
 }
 
 func (n *Node) Set(val any) {

debug.go

@@ -103,7 +103,7 @@ func (n *Node) Dump() {
 	Indent(b, "id           = ", n.id)
 	Indent(b, "Name         = ", n.Name)
 	Indent(b, "(X,Y)        = ", n.X, n.Y)
-	Indent(b, "Next (X,Y)   = ", n.NextX, n.NextY)
+	Indent(b, "Next (W,H)   = ", n.NextW, n.NextH)
 
 	if (n.parent == nil) {
 		Indent(b, "parent       = nil")

debugWidget.go

@@ -250,7 +250,7 @@ func (n *Node) debugAddWidgetButton() {
 		newB :=  activeLabelNewB.B
 
 		if (newY == -1) {
-			name = name + " (" + strconv.Itoa(activeWidget.NextX) + "," + strconv.Itoa(activeWidget.NextY) + ")"
+			name = name + " (" + strconv.Itoa(activeWidget.NextW) + "," + strconv.Itoa(activeWidget.NextH) + ")"
 		} else {
 			activeWidget.SetNext(newX, newY)
 			name = name + " (" + strconv.Itoa(newX) + "," + strconv.Itoa(newY) + ")"
@@ -259,9 +259,9 @@ func (n *Node) debugAddWidgetButton() {
 		log("New Type =", activeLabelNewType.S)
 		log("New X    =", newX)
 		log("New Y    =", newY)
-		log("activeWidget.NextX    =", activeWidget.NextX)
-		log("activeWidget.NextY    =", activeWidget.NextY)
-		log(debugNow, "Add() size (X,Y)", activeWidget.X, activeWidget.Y, "put next thing at (X,Y) =", activeWidget.NextX, activeWidget.NextY)
+		log("activeWidget.NextW    =", activeWidget.NextW)
+		log("activeWidget.NextH    =", activeWidget.NextH)
+		log(debugNow, "Add() size (X,Y)", activeWidget.X, activeWidget.Y, "put next thing at (W,H) =", activeWidget.NextW, activeWidget.NextH)
 		activeWidget.Dump()
 
 		// activeWidget.X = newX

grid.go

@@ -33,23 +33,58 @@ func (n *Node) NewGrid(name string, w int, h int) *Node {
 	a.Y = h
 	newNode.X = w
 	newNode.Y = h
-	newNode.NextX = 1
-	newNode.NextY = 1
+	newNode.NextW = 1
+	newNode.NextH = 1
 
 	sendAction(a, newNode, n)
 
 	return newNode
 }
 
-// increments where the next element in the grid should go
-func placeGrid(a *toolkit.Action, n *Node, where *Node) {
-	where.NextY += 1
-	if (where.NextY > where.Y) {
-		where.NextX += 1
-		where.NextY = 1
+// true if the grid already have a child at W,H
+func (n *Node) gridCollision(w int, h int) bool {
+	for _, child := range n.children {
+		if ((child.AtW == w) && (child.AtH == h)) {
+			return true
+		}
+	}
+	return false
+}
+
+// increments NextW & NextH
+func (n *Node) gridIncrement(w int, h int) bool {
+	for _, child := range n.children {
+		if ((child.AtW == w) && (child.AtH == h)) {
+			return true
+		}
+	}
+	return false
+}
+
+func (n *Node) At(w int, h int) *Node {
+	if (n == nil) {
+		return n
 	}
 
-	a.X = where.NextX
-	a.Y = where.NextY
-	log(logNow, "placeGrid() (X,Y)", where.X, where.Y, " next(X,Y) =", where.NextX, where.NextY)
+	n.NextW = w
+	n.NextH = h
+
+	// TODO: check for a collision here
+	if n.gridCollision(w,h) {
+		// TODO: find free next w,h
+	}
+	return n
+}
+
+// finds the next place on the grid to place the new node 'n'
+func placeGrid(a *toolkit.Action, n *Node, where *Node) {
+	where.NextH += 1
+	if (where.NextH > where.Y) {
+		where.NextW += 1
+		where.NextH = 1
+	}
+
+	a.X = where.NextW
+	a.Y = where.NextH
+	log(logNow, "placeGrid() (X,Y)", where.X, where.Y, " next(X,Y) =", where.NextW, where.NextH)
 }

structs.go

@@ -31,6 +31,8 @@ type GuiArgs struct {
 }
 
 type guiConfig struct {
+	initOnce sync.Once
+
 	// This is the master node. The Binary Tree starts here
 	rootNode *Node
 
@@ -54,7 +56,6 @@ type guiConfig struct {
 // simply the name and the size of whatever GUI element exists
 type Node struct {
 	id     int
-	initOnce sync.Once
 
 	WidgetType	toolkit.WidgetType
 
@@ -69,9 +70,12 @@ type Node struct {
 	X	int
 	Y	int
 
-	// used for grids and tables
-	NextX	int
-	NextY	int
+	// the position of the widget in a grid
+	AtW	int
+	AtH	int
+	// where the next widget should be put in a grid
+	NextW	int
+	NextH	int
 
 	// used for values
 	I	int