Index: ppapi/api/pp_input_event.idl |
=================================================================== |
--- ppapi/api/pp_input_event.idl (revision 96394) |
+++ ppapi/api/pp_input_event.idl (working copy) |
@@ -128,10 +128,9 @@ |
uint32_t modifier; |
/** |
- * Indicates the amount vertically and horizontally the user has requested |
- * to scroll by with their mouse wheel. A scroll down or to the right (where |
- * the content moves up or left) is represented as positive values, and |
- * a scroll up or to the left (where the content moves down or right) is |
+ * The mouse wheel's horizontal scroll amount. A scroll to the right |
+ * (where the content moves left) is represented as positive values, |
+ * and a scroll to the left (where the content moves right) is |
* represented as negative values. |
* |
* The units are either in pixels (when scroll_by_page is false) or pages |
@@ -150,7 +149,26 @@ |
*/ |
float_t delta_x; |
- /** This value represents */ |
+ /** |
+ * The mouse wheel's vertical scroll amount. A scroll to the right |
+ * (where the content moves up) is represented as positive values, |
+ * and a scroll to the left (where the content moves right) is |
der Springer
2011/08/11 19:20:51
"A scroll down (where the content moves up) is rep
|
+ * represented as negative values. |
+ * |
+ * The units are either in pixels (when scroll_by_page is false) or pages |
+ * (when scroll_by_page is true). For example, delta_y = -3 means scroll up 3 |
+ * pixels when scroll_by_page is false, and scroll up 3 pages when |
+ * scroll_by_page is true. |
+ * |
+ * This amount is system dependent and will take into account the user's |
+ * preferred scroll sensitivity and potentially also nonlinear acceleration |
+ * based on the speed of the scrolling. |
+ * |
+ * Devices will be of varying resolution. Some mice with large detents will |
+ * only generate integer scroll amounts. But fractional values are also |
+ * possible, for example, on some trackpads and newer mice that don't have |
+ * "clicks". |
+ */ |
float_t delta_y; |
/** |