1 files changed, 110 insertions, 0 deletions
diff --git a/redo/tab_windows.go b/redo/tab_windows.go
new file mode 100644
index 0000000..e9d116b
--- /dev/null
+++ b/redo/tab_windows.go
@@ -0,0 +1,110 @@
+// 25 july 2014
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "winapi_windows.h"
+import "C"
+
+/*
+On Windows, container controls are just regular controls; their children have to be children of the parent window, and changing the contents of a switching container (such as a tab control) must be done manually.
+
+TODO
+- make sure all tabs cannot be deselected (that is, make sure the current tab can never have index -1)
+- see if we can safely make the controls children of the tab control itself or if that would just screw our subclassing
+*/
+
+type tab struct {
+	*controlbase
+	tabs				[]*sizer
+	supersetParent		func(p *controlParent)
+	superallocate		func(x int, y int, width int, height int, d *sizing) []*allocation
+}
+
+func newTab() Tab {
+	c := newControl(C.xWC_TABCONTROL,
+		C.TCS_TOOLTIPS | C.WS_TABSTOP,
+		0)
+	t := &tab{
+		controlbase:	c,
+	}
+	t.supersetParent = t.fsetParent
+	t.fsetParent = t.tabsetParent
+	t.fpreferredSize = t.tabpreferredSize
+	t.superallocate = t.fallocate
+	t.fallocate = t.taballocate
+	C.controlSetControlFont(t.hwnd)
+	C.setTabSubclass(t.hwnd, unsafe.Pointer(t))
+	return t
+}
+
+func (t *tab) tabsetParent(p *controlParent) {
+	t.supersetParent(p)
+	for _, c := range t.tabs {
+		c.child.setParent(p)
+	}
+}
+
+func (t *tab) Append(name string, control Control) {
+	s := new(sizer)
+	t.tabs = append(t.tabs, s)
+	s.child = control
+	if t.parent != nil {
+		s.child.setParent(&controlParent{t.parent})
+	}
+	// initially hide tab 1..n controls; if we don't, they'll appear over other tabs, resulting in weird behavior
+	if len(t.tabs) != 1 {
+		s.child.containerHide()
+	}
+	C.tabAppend(t.hwnd, toUTF16(name))
+}
+
+//export tabChanging
+func tabChanging(data unsafe.Pointer, current C.LRESULT) {
+	t := (*tab)(data)
+	t.tabs[int(current)].child.containerHide()
+}
+
+//export tabChanged
+func tabChanged(data unsafe.Pointer, new C.LRESULT) {
+	t := (*tab)(data)
+	t.tabs[int(new)].child.containerShow()
+}
+
+func (t *tab) tabpreferredSize(d *sizing) (width, height int) {
+	// TODO only consider the size of the current tab?
+	for _, s := range t.tabs {
+		w, h := s.child.preferredSize(d)
+		if width < w {
+			width = w
+		}
+		if height < h {
+			height = h
+		}
+	}
+	return width, height + int(C.tabGetTabHeight(t.hwnd))
+}
+
+// a tab control contains other controls; size appropriately
+// TODO change this to commitResize()
+func (t *tab) taballocate(x int, y int, width int, height int, d *sizing) []*allocation {
+	var r C.RECT
+
+	// figure out what the rect for each child is...
+	r.left = C.LONG(x)				// load structure with the window's rect
+	r.top = C.LONG(y)
+	r.right = C.LONG(x + width)
+	r.bottom = C.LONG(y + height)
+	C.tabGetContentRect(t.hwnd, &r)
+	// and allocate
+	// don't allocate to just the current tab; allocate to all tabs!
+	for _, s := range t.tabs {
+		// because each widget is actually a child of the Window, the origin is the one we calculated above
+		s.resize(int(r.left), int(r.top), int(r.right - r.left), int(r.bottom - r.top))
+	}
+	// and now allocate the tab control itself
+	return t.superallocate(x, y, width, height, d)
+}