Added the framework for tabs, added necessary assistant routines for tabs, and implemented those assistant routines on the Windows backend.

redo/containers.go

@@ -0,0 +1,24 @@
+// 25 july 2014
+
+package ui
+
+// 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 rename?
+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.
+func NewTab() Tab {
+	return newTab()
+}

redo/controls.go

@@ -9,6 +9,8 @@ type Control interface {
 	parent(*window)
 	// TODO enable/disable (public)
 	// TODO show/hide (public)
+	containerShow()		// for Windows, where all controls need ot belong to an overlapped window, not to a container control; these respect programmer settings
+	containerHide()
 	controlSizing
 }
 

redo/controls_windows.go

@@ -30,6 +30,14 @@ func (w *widgetbase) parent(win *window) {
 	// TODO new control does not show up until window is resized
 }
 
+func (w *widgetbase) containerShow() {
+	C.ShowWindow(w.hwnd, C.SW_SHOW)
+}
+
+func (w *widgetbase) containerHide() {
+	C.ShowWindow(w.hwnd, C.SW_HIDE)
+}
+
 // don't embed these as exported; let each Control decide if it should
 
 func (w *widgetbase) text() string {