Added method to draw an arrow shape like that of the BScrollBar.

TODO: Adjust BScrollBar to use it.
TODO: Make it virtual like the others, but I don't want to break Vision and
other native Haiku apps just now.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29630 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/ControlLook.h

@@ -48,6 +48,13 @@ public:
 								| B_TOP_BORDER | B_BOTTOM_BORDER
 	};
 
+	enum {
+		B_LEFT_ARROW		= 0,
+		B_RIGHT_ARROW		= 1,
+		B_UP_ARROW			= 2,
+		B_DOWN_ARROW		= 3
+	};
+
 	enum {
 		B_FOCUSED			= 1 << 0,
 		B_CLICKED			= 1 << 1, // some controls activate on mouse up
@@ -134,6 +141,13 @@ public:
 									const rgb_color& base, uint32 flags,
 									enum orientation orientation);
 
+	// TODO: Make virtual before R1 release
+			void				DrawArrowShape(BView* view,
+									BRect& rect, const BRect& updateRect,
+									const rgb_color& base, uint32 direction,
+									uint32 flags = 0,
+									float tint = B_DARKEN_MAX_TINT);
+
 	virtual	rgb_color			SliderBarColor(const rgb_color& base);
 
 	virtual void				DrawSliderBar(BView* view, BRect rect,

src/kits/interface/ControlLook.cpp

@@ -686,6 +686,70 @@ BControlLook::DrawScrollBarBackground(BView* view, BRect& rect,
 }
 
 
+void
+BControlLook::DrawArrowShape(BView* view, BRect& rect, const BRect& updateRect,
+	const rgb_color& base, uint32 direction, uint32 flags, float tint)
+{
+	BPoint tri1, tri2, tri3;
+	float hInset = rect.Width() / 3;
+	float vInset = rect.Height() / 3;
+	rect.InsetBy(hInset, vInset);
+
+	switch (direction) {
+		case B_LEFT_ARROW:
+			tri1.Set(rect.right, rect.top);
+			tri2.Set(rect.right - rect.Width() / 1.33,
+				(rect.top + rect.bottom + 1) /2 );
+			tri3.Set(rect.right, rect.bottom + 1);
+			break;
+		case B_RIGHT_ARROW:
+			tri1.Set(rect.left, rect.bottom + 1);
+			tri2.Set(rect.left + rect.Width() / 1.33,
+				(rect.top + rect.bottom + 1) / 2);
+			tri3.Set(rect.left, rect.top);
+			break;
+		case B_UP_ARROW:
+			tri1.Set(rect.left, rect.bottom);
+			tri2.Set((rect.left + rect.right + 1) / 2,
+				rect.bottom - rect.Height() / 1.33);
+			tri3.Set(rect.right + 1, rect.bottom);
+			break;
+		case B_DOWN_ARROW:
+		default:
+			tri1.Set(rect.left, rect.top);
+			tri2.Set((rect.left + rect.right + 1) / 2,
+				rect.top + rect.Height() / 1.33);
+			tri3.Set(rect.right + 1, rect.top);
+			break;
+	}
+	// offset triangle if down
+	if (flags & B_ACTIVATED)
+		view->MovePenTo(BPoint(1, 1));
+	else
+		view->MovePenTo(BPoint(0, 0));
+
+	BShape arrowShape;
+	arrowShape.MoveTo(tri1);
+	arrowShape.LineTo(tri2);
+	arrowShape.LineTo(tri3);
+
+	if (flags & B_DISABLED)
+		tint = (tint + B_NO_TINT + B_NO_TINT) / 3;
+
+	view->SetHighColor(tint_color(base, tint));
+
+	float penSize = view->PenSize();
+	drawing_mode mode = view->DrawingMode();
+
+	view->SetPenSize(ceilf(hInset / 2.0));
+	view->SetDrawingMode(B_OP_OVER);
+	view->StrokeShape(&arrowShape);
+
+	view->SetPenSize(penSize);
+	view->SetDrawingMode(mode);
+}
+
+
 rgb_color
 BControlLook::SliderBarColor(const rgb_color& base)
 {