Added nested and empty tabs to the test program, and fixed up relevant documentation.

redo/basicctrls.go

@@ -64,19 +64,13 @@ func NewPasswordField() TextField {
 
 // Tab is a Control that contains multiple pages of tabs, each containing a single Control.
 // You can add and remove tabs from the Tab at any time.
-//
-// [TODO if each tab of your Tab is going to have the same content Controls, then use LikeTab instead, to conserve resources]
+// The appearance of a Tab with no tabs is implementation-defined.
 type Tab interface {
 	Control
 
 	// Append adds a new tab to Tab.
 	// The tab is added to the end of the current list of tabs.
 	Append(name string, control Control)
-
-	// Delete removes the given tab.
-	// It panics if index is out of range.
-//	Delete(index int)
-//TODO
 }
 
 // NewTab creates a new Tab with no tabs.

redo/future

@@ -10,6 +10,13 @@ Table
 		table_darwin.m: constructor
 		table_unix.c: goTableModel_get_column_type(), goTableModel_get_value()
 	multiple selection
+Tab
+	// [TODO if each tab of your Tab is going to have the same content Controls, then use LikeTab instead, to conserve resources]
+	Delete()
+		// Delete removes the given tab.
+		// It panics if index is out of range.
+		// After Delete(), the effect of accessing the Control of the deleted tab or any of its children is undefned. [TODO reword?]
+	investigate close buttons (especially for LikeTab)
 
 so I don't forget, some TODOs:
 windows

redo/tab_windows.c

@@ -70,7 +70,7 @@ LONG tabGetTabHeight(HWND hwnd)
 	LONG tallest;
 
 	n = SendMessageW(hwnd, TCM_GETITEMCOUNT, 0, 0);
-	/* if there are no tabs, then the control just draws a box over the full window rect, reserving no space for tabs (TODO check on windows xp and 7); this is handled here */
+	/* if there are no tabs, then the control just draws a box over the full window rect, reserving no space for tabs; this is handled with the next line */
 	tallest = 0;
 	for (i = 0; i < n; i++) {
 		if (SendMessageW(hwnd, TCM_GETITEMRECT, (WPARAM) i, (LPARAM) (&r)) == FALSE)

redo/zz_test.go

@@ -31,6 +31,7 @@ var ddata = []dtype{
 type testwin struct {
 	t		Tab
 	w		Window
+	nt		Tab
 	a		Area
 	spw		*Stack
 	sph		*Stack
@@ -64,6 +65,11 @@ func (tw *testwin) make(done chan struct{}) {
 		done <- struct{}{}
 		return true
 	})
+	tw.t.Append("Blank Tab", NewTab())
+	tw.nt = NewTab()
+	tw.nt.Append("Tab 1", Space())
+	tw.nt.Append("Tab 2", Space())
+	tw.t.Append("Tab", tw.nt)
 	tw.t.Append("Space", Space())
 	tw.a = NewArea(200, 200, &areaHandler{})
 	tw.t.Append("Area", tw.a)