BColorControl: Position text controls better

Position the text control vertically in the middle of the ramp in
the case that the text controls are pushed down so that the red, green,
and blue text controls are next to the red, green, and blue ramps.

src/kits/interface/ColorControl.cpp

@@ -196,16 +196,17 @@ BColorControl::_LayoutView()
 		fPaletteFrame.bottom -= 1;
 	}
 
-	BRect rect = fPaletteFrame.InsetByCopy(-kBevelSpacing, -kBevelSpacing);
-		// frame including bevel
-
-	float offset = floorf(rect.bottom / 4);
-	float y = offset;
-	if (offset < _TextRectOffset()) {
-		offset = _TextRectOffset();
-		y = 0;
+	float rampHeight = (float)(fRows * fCellSize / kRampCount);
+	float offset = _TextRectOffset();
+	float y = 0;
+	if (rampHeight > fRedText->Frame().Height()) {
+		// there is enough room to fit kRampCount labels,
+		// shift text controls down by one ramp
+		offset = rampHeight;
+		y = floorf(offset + (offset - fRedText->Frame().Height()) / 2);
 	}
 
+	BRect rect = _PaletteFrame();
 	fRedText->MoveTo(rect.right + kTextFieldsHSpacing, y);
 
 	y += offset;