tabview and textview render when empty, textview highlights -- for al…

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README.md

@@ -97,8 +97,6 @@ Currently at a **pre-beta** level (**DON'T RECOMMEND USING RIGHT NOW** -- come b
 * drag on textview should prevent DND -- dnd not getting "processed"
 
 * TextView:
-	+ array of select regions -- for search fill 'em all up!  draw in a loop with bounds-checking
-    + draw bg at least even when empty -- blank proj should look like something is there
 	+ losing line numbers when typing new text, in some select cases
 	+ word-level functions: forward, back, delete etc.  ctrl+ backspace is back.
 	+ optimize wraparound multi-span rendering -- if no change in start of line, don't re render!

giv/tabview.go

@@ -38,6 +38,15 @@ var TabViewProps = ki.Props{
 	"height":           units.NewValue(10, units.Em),
 }
 
+// NTabs returns number of tabs
+func (tv *TabView) NTabs() int {
+	fr := tv.Frame()
+	if fr == nil {
+		return 0
+	}
+	return len(fr.Kids)
+}
+
 // AddTab adds a widget as a new tab, with given tab label, and returns the
 // index of that tab
 func (tv *TabView) AddTab(widg gi.Node2D, label string) int {
@@ -221,6 +230,9 @@ func (tv *TabView) InitTabView() {
 	if len(tv.Kids) == 2 {
 		return
 	}
+	if tv.Sty.Font.Size.Val == 0 { // not yet styled
+		tv.StyleLayout()
+	}
 	updt := tv.UpdateStart()
 	tv.Lay = gi.LayoutVert
 
@@ -229,6 +241,7 @@ func (tv *TabView) InitTabView() {
 	tabs.SetStretchMaxWidth()
 	// tabs.SetStretchMaxHeight()
 	tabs.SetMinPrefWidth(units.NewValue(10, units.Em))
+	tabs.SetProp("height", units.NewValue(1.8, units.Em))
 	tabs.SetProp("overflow", "hidden") // no scrollbars!
 	tabs.SetProp("padding", units.NewValue(0, units.Px))
 	tabs.SetProp("margin", units.NewValue(0, units.Px))
@@ -277,6 +290,11 @@ func (tv *TabView) RenumberTabs() {
 	}
 }
 
+func (tv *TabView) Style2D() {
+	tv.InitTabView()
+	tv.Layout.Style2D()
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////
 // TabButton
 

giv/textbuf.go

@@ -94,25 +94,27 @@ func (tb *TextBuf) Text() []byte {
 	return tb.Txt
 }
 
+// Refresh signals any views to refresh views
+func (tb *TextBuf) Refresh() {
+	tb.TextBufSig.Emit(tb.This, int64(TextBufNew), tb.Txt)
+}
+
 // todo: use https://github.com/andybalholm/crlf to deal with cr/lf etc --
 // internally just use lf = \n
 
 // New initializes a new buffer with n blank lines
 func (tb *TextBuf) New(nlines int) {
-	if cap(tb.Lines) >= nlines {
-		tb.Lines = tb.Lines[:nlines]
-	} else {
-		tb.Lines = make([][]rune, nlines)
-		if nlines == 1 {
-			tb.Lines[0] = []rune("")
-		}
+	tb.Lines = make([][]rune, nlines)
+	if nlines == 1 {
+		tb.Lines[0] = []rune("")
 	}
 	if cap(tb.ByteOffs) >= nlines {
 		tb.ByteOffs = tb.ByteOffs[:nlines]
 	} else {
 		tb.ByteOffs = make([]int, nlines)
 	}
 	tb.NLines = nlines
+	tb.Refresh()
 }
 
 // Open loads text from a file into the buffer
@@ -367,6 +369,16 @@ type TextRegion struct {
 	End   TextPos
 }
 
+// NewTextRegionLen makes a new TextRegion from a starting point and a length
+// along same line
+func NewTextRegionLen(start TextPos, len int) TextRegion {
+	reg := TextRegion{}
+	reg.Start = start
+	reg.End = start
+	reg.End.Ch += len
+	return reg
+}
+
 var TextRegionZero = TextRegion{}
 
 // TextBufEdit describes an edit action to a buffer -- this is the data passed