SL-11910 [Win] Horizontal scroll

4 files changed, 42 insertions, 0 deletions

diff --git a/indra/llwindow/llmousehandler.h b/indra/llwindow/llmousehandler.h
index 8e6fbdb4e3..1dcd0348d8 100644
--- a/indra/llwindow/llmousehandler.h
+++ b/indra/llwindow/llmousehandler.h
@@ -66,6 +66,7 @@ public:
 
 	virtual BOOL	handleHover(S32 x, S32 y, MASK mask) = 0;
 	virtual BOOL	handleScrollWheel(S32 x, S32 y, S32 clicks) = 0;
+	virtual BOOL	handleScrollHWheel(S32 x, S32 y, S32 clicks) = 0;
 	virtual BOOL	handleToolTip(S32 x, S32 y, MASK mask) = 0;
 	virtual const std::string& getName() const = 0;
 
diff --git a/indra/llwindow/llwindowcallbacks.cpp b/indra/llwindow/llwindowcallbacks.cpp
index c01f574375..be61e1e16c 100644
--- a/indra/llwindow/llwindowcallbacks.cpp
+++ b/indra/llwindow/llwindowcallbacks.cpp
@@ -130,6 +130,10 @@ void LLWindowCallbacks::handleScrollWheel(LLWindow *window, S32 clicks)
 {
 }
 
+void LLWindowCallbacks::handleScrollHWheel(LLWindow *window, S32 clicks)
+{
+}
+
 void LLWindowCallbacks::handleResize(LLWindow *window, const S32 width, const S32 height)
 {
 }
diff --git a/indra/llwindow/llwindowcallbacks.h b/indra/llwindow/llwindowcallbacks.h
index 9304446f8f..3b18648138 100644
--- a/indra/llwindow/llwindowcallbacks.h
+++ b/indra/llwindow/llwindowcallbacks.h
@@ -56,6 +56,7 @@ public:
 	virtual void handleMouseMove(LLWindow *window,  LLCoordGL pos, MASK mask);
     virtual void handleMouseDragged(LLWindow *window,  LLCoordGL pos, MASK mask);
 	virtual void handleScrollWheel(LLWindow *window,  S32 clicks);
+	virtual void handleScrollHWheel(LLWindow *window,  S32 clicks);
 	virtual void handleResize(LLWindow *window,  S32 width,  S32 height);
 	virtual void handleFocus(LLWindow *window);
 	virtual void handleFocusLost(LLWindow *window);
diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 8fefb119bc..3c69aa98c4 100644
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -2662,6 +2662,42 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 			return 0;
 			}
 			*/
+		case WM_MOUSEHWHEEL:
+			{
+				window_imp->mCallbacks->handlePingWatchdog(window_imp, "Main:WM_MOUSEHWHEEL");
+				static short h_delta = 0;
+
+				RECT	client_rect;
+
+				// eat scroll events that occur outside our window, since we use mouse position to direct scroll
+				// instead of keyboard focus
+				// NOTE: mouse_coord is in *window* coordinates for scroll events
+				POINT mouse_coord = {(S32)(S16)LOWORD(l_param), (S32)(S16)HIWORD(l_param)};
+
+				if (ScreenToClient(window_imp->mWindowHandle, &mouse_coord)
+					&& GetClientRect(window_imp->mWindowHandle, &client_rect))
+				{
+					// we have a valid mouse point and client rect
+					if (mouse_coord.x < client_rect.left || client_rect.right < mouse_coord.x
+						|| mouse_coord.y < client_rect.top || client_rect.bottom < mouse_coord.y)
+					{
+						// mouse is outside of client rect, so don't do anything
+						return 0;
+					}
+				}
+
+				S16 incoming_h_delta = HIWORD(w_param);
+				h_delta += incoming_h_delta;
+
+				// If the user rapidly spins the wheel, we can get messages with
+				// large deltas, like 480 or so.  Thus we need to scroll more quickly.
+				if (h_delta <= -WHEEL_DELTA || WHEEL_DELTA <= h_delta)
+				{
+					window_imp->mCallbacks->handleScrollHWheel(window_imp, h_delta / WHEEL_DELTA);
+					h_delta = 0;
+				}
+				return 0;
+			}
 			// Handle mouse movement within the window
 		case WM_MOUSEMOVE:
 			{