1 files changed, 51 insertions, 0 deletions
diff --git a/prev/control.go b/prev/control.go
new file mode 100644
index 0000000..52202b7
--- /dev/null
+++ b/prev/control.go
@@ -0,0 +1,51 @@
+// 30 july 2014
+
+package ui
+
+// Control represents a control.
+type Control interface {
+	setParent(p *controlParent) // controlParent defined per-platform
+	preferredSize(d *sizing) (width, height int)
+	resize(x int, y int, width int, height int, d *sizing)
+	nTabStops() int		// used by the Windows backend
+
+	// these are provided for Tab on Windows, where we have to show and hide the individual tab pages manually
+	// if we ever get something like a SidebarStack of some sort, we'll need to implement this everywhere
+	containerShow()	// show if and only if programmer said to show
+	containerHide()	// hide regardless of whether programmer said to hide
+}
+
+type controlbase struct {
+	fsetParent			func(p *controlParent)
+	fpreferredSize		func(d *sizing) (width, height int)
+	fresize			func(x int, y int, width int, height int, d *sizing)
+	fnTabStops		func() int
+	fcontainerShow	func()
+	fcontainerHide		func()
+}
+
+// children should not use the same name as these, otherwise weird things will happen
+
+func (c *controlbase) setParent(p *controlParent) {
+	c.fsetParent(p)
+}
+
+func (c *controlbase) preferredSize(d *sizing) (width, height int) {
+	return c.fpreferredSize(d)
+}
+
+func (c *controlbase) resize(x int, y int, width int, height int, d *sizing) {
+	c.fresize(x, y, width, height, d)
+}
+
+func (c *controlbase) nTabStops() int {
+	return c.fnTabStops()
+}
+
+func (c *controlbase) containerShow() {
+	c.fcontainerShow()
+}
+
+func (c *controlbase) containerHide() {
+	c.fcontainerHide()
+}