stub in code to page large windows

eventBindingsStdout.go

@@ -67,6 +67,14 @@ func stdoutArrowDown(g *gocui.Gui, v *gocui.View) error {
 }
 
 func stdoutPgdn(g *gocui.Gui, v *gocui.View) error {
+	win := findWindowUnderMouse()
+	if win != nil {
+		if win.full.Height() > 50 {
+			log.Info("paging through really large window pager =", win.window.pager)
+			win.window.pager += 10
+			return nil
+		}
+	}
 	me.stdout.pager += 10
 
 	tk := me.stdout.tk

structs.go

@@ -163,7 +163,9 @@ type window struct {
 	order       int        // what level the window is on
 	// resize      bool       // only set the title once
 	collapsed bool // only show the window title bar
-	dense     bool // true if the window is huge
+	dense     bool // true if the window is dense
+	large     bool // true if the window is huge
+	pager     int  // allows the user to page through the window
 }
 
 type colorT struct {

treeDraw.go

@@ -41,6 +41,41 @@ func (tk *guiWidget) doNotDraw() bool {
 	return false
 }
 
+// page widgets in the window
+func (tk *guiWidget) pageWidget() *rectType {
+	r := new(rectType)
+
+	var check bool
+	switch tk.node.WidgetType {
+	case widget.Button:
+		check = true
+	case widget.Label:
+		check = true
+	default:
+	}
+	if !check {
+		return nil
+	}
+	win := tk.findParentWindow()
+	if win == nil {
+		// don't draw anything if you can't find the parent window
+		return nil
+	}
+
+	r.w0 = tk.gocuiSize.w0
+	r.h0 = tk.gocuiSize.h0
+	r.w1 = tk.gocuiSize.w1
+	r.h1 = tk.gocuiSize.h1
+
+	// r.h0 = tk.gocuiSize.h0 - win.gocuiSize.h0
+
+	if r.h0 > 20 {
+		return r
+	}
+
+	return r
+}
+
 // display's the text of the widget in gocui
 // deletes the old view if it exists and recreates it
 func (tk *guiWidget) drawView() {
@@ -70,9 +105,23 @@ func (tk *guiWidget) drawView() {
 	c := tk.gocuiSize.w1
 	d := tk.gocuiSize.h1
 
+	if r := tk.pageWidget(); r == nil {
+		// if nil, draw whatever it is anyway
+	} else {
+		if r.Width() == 0 && r.Height() == 0 {
+			// don't draw empty stuff
+			return
+		}
+		a = r.w0
+		b = r.h0
+		c = r.w1
+		d = r.h1
+	}
+
 	if tk.node.WidgetType == widget.Window || tk.node.WidgetType == widget.Flag {
-		if tk.gocuiSize.Height() > 30 {
-			tk.gocuiSize.h1 = tk.gocuiSize.h0 + 30
+		if tk.gocuiSize.Height() > 40 {
+			tk.window.large = true
+			tk.gocuiSize.h1 = tk.gocuiSize.h0 + 40
 			d = tk.gocuiSize.h1
 		}
 	}
@@ -98,7 +147,6 @@ func (tk *guiWidget) drawView() {
 		b = tk.gocuiSize.h0
 		c = tk.gocuiSize.w1
 		d = tk.gocuiSize.h1
-
 	}
 
 	tk.v, err = me.baseGui.SetView(tk.cuiName, a, b, c, d, 0)