1 files changed, 111 insertions, 0 deletions
diff --git a/BBB_GOFILES/area.go b/BBB_GOFILES/area.go
new file mode 100644
index 0000000..f7ed41c
--- /dev/null
+++ b/BBB_GOFILES/area.go
@@ -0,0 +1,111 @@
+// 16 december 2015
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "ui.h"
+import "C"
+
+// Area is a Control that represents a blank canvas that a program
+// can draw on as it wishes. Areas also receive keyboard and mouse
+// events, and programs can react to those as they see fit. Drawing
+// and event handling are handled through an instance of a type
+// that implements AreaHandler that every Area has; see AreaHandler
+// for details.
+// 
+// There are two types of areas. Non-scrolling areas are rectangular
+// and have no scrollbars. Programs can draw on and get mouse
+// events from any point in the Area, and the size of the Area is
+// decided by package ui itself, according to the layout of controls
+// in the Window the Area is located in and the size of said Window.
+// There is no way to query the Area's size or be notified when its
+// size changes; instead, you are given the area size as part of the
+// draw and mouse event handlers, for use solely within those
+// handlers.
+// 
+// Scrolling areas have horziontal and vertical scrollbars. The amount
+// that can be scrolled is determined by the area's size, which is
+// decided by the programmer (both when creating the Area and by
+// a call to SetSize). Only a portion of the Area is visible at any time;
+// drawing and mouse events are automatically adjusted to match
+// what portion is visible, so you do not have to worry about scrolling
+// in your event handlers. AreaHandler has more information.
+// 
+// The internal coordinate system of an Area is points, which are
+// floating-point and device-independent. For more details, see
+// AreaHandler. The size of a scrolling Area must be an exact integer
+// number of points (that is, you cannot have an Area that is 32.5
+// points tall) and thus the parameters to NewScrollingArea and
+// SetSize are ints. All other instances of points in parameters and
+// structures (including sizes of drawn objects) are float64s.
+type Area struct {
+	ControlBase
+	a	*C.uiArea
+	ah	*C.uiAreaHandler
+	scrolling	bool
+}
+
+// NewArea creates a new non-scrolling Area.
+func NewArea(handler AreaHandler) *Area {
+	a := new(Area)
+	a.scrolling = false
+	a.ah = registerAreaHandler(handler)
+
+	a.a = C.uiNewArea(a.ah)
+
+	a.ControlBase = NewControlBase(a, uintptr(unsafe.Pointer(a.a)))
+	return a
+}
+
+// NewScrollingArea creates a new scrolling Area of the given size,
+// in points.
+func NewScrollingArea(handler AreaHandler, width int, height int) *Area {
+	a := new(Area)
+	a.scrolling = true
+	a.ah = registerAreaHandler(handler)
+
+	a.a = C.uiNewScrollingArea(a.ah, C.int(width), C.int(height))
+
+	a.ControlBase = NewControlBase(a, uintptr(unsafe.Pointer(a.a)))
+	return a
+}
+
+// Destroy destroys the Area.
+func (a *Area) Destroy() {
+	unregisterAreaHandler(a.ah)
+	a.ControlBase.Destroy()
+}
+
+// SetSize sets the size of a scrolling Area to the given size, in points.
+// SetSize panics if called on a non-scrolling Area.
+func (a *Area) SetSize(width int, height int) {
+	if !a.scrolling {
+		panic("attempt to call SetSize on non-scrolling Area")
+	}
+	C.uiAreaSetSize(a.a, C.int(width), C.int(height))
+}
+
+// QueueRedrawAll queues the entire Area for redraw.
+// The Area is not redrawn before this function returns; it is
+// redrawn when next possible.
+func (a *Area) QueueRedrawAll() {
+	C.uiAreaQueueRedrawAll(a.a)
+}
+
+// ScrollTo scrolls the Area to show the given rectangle; what this
+// means is implementation-defined, but you can safely assume
+// that as much of the given rectangle as possible will be visible
+// after this call. (TODO verify this on OS X) ScrollTo panics if called
+// on a non-scrolling Area.
+func (a *Area) ScrollTo(x float64, y float64, width float64, height float64) {
+	if !a.scrolling {
+		panic("attempt to call ScrollTo on non-scrolling Area")
+	}
+	C.uiAreaScrollTo(a.a, C.double(x), C.double(y), C.double(width), C.double(height))
+}
+
+// TODO BeginUserWindowMove
+// TODO BeginUserWindowResize