Scroll panel fix (#129)

* scrollPanel fix

fixed a bug of the scrollbars disappearing
implemented checking of scrollbar side for drawing the little rectangle

* readded (int) cast

src/raygui.h

@@ -898,7 +898,7 @@ Rectangle GuiScrollPanel(Rectangle bounds, Rectangle content, Vector2 *scroll)
     if (hasHorizontalScrollBar)
     {
         // Change scrollbar slider size to show the diff in size between the content width and the widget width
-        GuiSetStyle(SCROLLBAR, SCROLL_SLIDER_SIZE, (int)((bounds.width - 2*GuiGetStyle(DEFAULT, BORDER_WIDTH) - verticalScrollBarWidth)/ (int)content.width)*((int)bounds.width - 2*GuiGetStyle(DEFAULT, BORDER_WIDTH) - verticalScrollBarWidth));
+        GuiSetStyle(SCROLLBAR, SCROLL_SLIDER_SIZE, (int)(((bounds.width - 2 * GuiGetStyle(DEFAULT, BORDER_WIDTH) - verticalScrollBarWidth) / (int)content.width) * ((int)bounds.width - 2 * GuiGetStyle(DEFAULT, BORDER_WIDTH) - verticalScrollBarWidth)));
         scrollPos.x = (float)-GuiScrollBar(horizontalScrollBar, (int)-scrollPos.x, (int)horizontalMin, (int)horizontalMax);
     }
 
@@ -906,15 +906,14 @@ Rectangle GuiScrollPanel(Rectangle bounds, Rectangle content, Vector2 *scroll)
     if (hasVerticalScrollBar)
     {
         // Change scrollbar slider size to show the diff in size between the content height and the widget height
-        GuiSetStyle(SCROLLBAR, SCROLL_SLIDER_SIZE, (int)((bounds.height - 2*GuiGetStyle(DEFAULT, BORDER_WIDTH) - horizontalScrollBarWidth)/ (int)content.height)* ((int)bounds.height - 2*GuiGetStyle(DEFAULT, BORDER_WIDTH) - horizontalScrollBarWidth));
+        GuiSetStyle(SCROLLBAR, SCROLL_SLIDER_SIZE, (int)(((bounds.height - 2 * GuiGetStyle(DEFAULT, BORDER_WIDTH) - horizontalScrollBarWidth) / (int)content.height) * ((int)bounds.height - 2 * GuiGetStyle(DEFAULT, BORDER_WIDTH) - horizontalScrollBarWidth)));
         scrollPos.y = (float)-GuiScrollBar(verticalScrollBar, (int)-scrollPos.y, (int)verticalMin, (int)verticalMax);
     }
 
     // Draw detail corner rectangle if both scroll bars are visible
     if (hasHorizontalScrollBar && hasVerticalScrollBar)
     {
-        // TODO: Consider scroll bars side
-        Rectangle corner = { horizontalScrollBar.x + horizontalScrollBar.width + 2, verticalScrollBar.y + verticalScrollBar.height + 2, (float)horizontalScrollBarWidth - 4, (float)verticalScrollBarWidth - 4 };
+        Rectangle corner = { (GuiGetStyle(LISTVIEW, SCROLLBAR_SIDE) == SCROLLBAR_LEFT_SIDE) ? (bounds.x + GuiGetStyle(DEFAULT, BORDER_WIDTH) + 2) : (horizontalScrollBar.x + horizontalScrollBar.width + 2), verticalScrollBar.y + verticalScrollBar.height + 2, (float)horizontalScrollBarWidth - 4, (float)verticalScrollBarWidth - 4 };
         GuiDrawRectangle(corner, 0, BLANK, Fade(GetColor(GuiGetStyle(LISTVIEW, TEXT + (state*3))), guiAlpha));
     }