Proper resizing

elements/grid.go

@@ -43,6 +43,8 @@ type Grid struct {
 
 	cursor image.Point
 
+	ignorePush bool
+
 	face   font.Face
 	config config.Wrapped
 	theme  theme.Wrapped
@@ -82,7 +84,9 @@ func (element *Grid) Set (point image.Point, cell Cell) {
 }
 
 func (element *Grid) Push () {
-	element.drawAndPush()
+	if !element.ignorePush {
+		element.drawAndPush()
+	}
 }
 
 func (element *Grid) OnResize (callback func ()) {
@@ -145,7 +149,7 @@ func (element *Grid) alloc () bool {
 	if width == oldWidth && height == oldHeight { return false }
 
 	oldCells  := element.cells
-	heightLarger := height < oldHeight
+	heightLarger := height > oldHeight
 	
 	element.stride = width
 	element.cells  = make([]gridCell, width * height)
@@ -153,22 +157,27 @@ func (element *Grid) alloc () bool {
 	// TODO: attempt to wrap text?
 
 	if heightLarger {
-	for index := range element.cells[oldHeight * width:] {
-		element.cells[index].initColor()
-	}}
+		newRowsStart := oldHeight * width
+		for index := range element.cells[newRowsStart:] {
+			element.cells[index + newRowsStart].initColor()
+		}
+	}
 
 	commonHeight := height
 	if heightLarger { commonHeight = oldHeight }
 	for index := range element.cells[:commonHeight * width] {
 		x := index % width
 		if x < oldWidth {
-			element.cells[index] = oldCells[x + index / oldWidth]
+			row := index / width
+			element.cells[index] = oldCells[x + row * oldWidth]
 		} else {
 			element.cells[index].initColor()
 		}
 	}
 
+	element.ignorePush = true
 	if element.onResize != nil { element.onResize() }
+	element.ignorePush = false
 	return true
 }
 

elements/terminal.go

@@ -1,5 +1,7 @@
 package elements
 
+import "image"
+import "git.tebibyte.media/sashakoshka/tomo"
 import "git.tebibyte.media/sashakoshka/piss/ansi"
 
 type Terminal struct {
@@ -9,6 +11,7 @@ type Terminal struct {
 
 func NewTerminal () (element *Terminal) {
 	element = &Terminal { Grid: NewGrid() }
+	element.Grid.OnResize(element.handleResize)
 	return
 }
 
@@ -17,3 +20,11 @@ func (element *Terminal) Write (buffer []byte) (wrote int, err error) {
 	element.Push()
 	return
 }
+
+func (element *Terminal) handleResize () {
+	element.Set(image.Pt(0, 0), Cell {
+		Rune: 'X',
+		Background: tomo.ColorRed,
+		Foreground: tomo.ColorBlack,
+	})
+}