Examples: Allegro, Apple, DirectX9/10/11, Glfw+Vulkan :Added support for horizontal mouse wheel. (#1463)

examples/allegro5_example/imgui_impl_a5.cpp

@@ -215,6 +215,7 @@ bool ImGui_ImplA5_ProcessEvent(ALLEGRO_EVENT *ev)
     {
     case ALLEGRO_EVENT_MOUSE_AXES:
         io.MouseWheel += ev->mouse.dz;
+        io.MouseWheelH += ev->mouse.dw;
         return true;
     case ALLEGRO_EVENT_KEY_CHAR:
         if (ev->keyboard.display == g_Display)

examples/apple_example/imguiex-ios/imgui_impl_ios.mm

@@ -587,9 +587,9 @@ void ImGui_ClipboardCallback(uSynergyCookie cookie, enum uSynergyClipboardFormat
             io.MouseDown[i] = g_MousePressed[i];
         }
 
-        // This is an arbitrary scaling factor that works for me. Not sure what units these
-        // mousewheel values from synergy are supposed to be in
+        // This is an arbitrary scaling factor that works for me. Not sure what units these mousewheel values from synergy are supposed to be in.
         io.MouseWheel = g_mouseWheelY / 500.0;
+        io.MouseWheelH = g_mouseWheelX / 500.0;
     }
     else
     {

examples/directx10_example/imgui_impl_dx10.cpp

@@ -275,6 +275,9 @@ IMGUI_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wPa
     case WM_MOUSEWHEEL:
         io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
         return 0;
+    case WM_MOUSEHWHEEL:
+        io.MouseWheelH += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        return 0;
     case WM_MOUSEMOVE:
         io.MousePos.x = (signed short)(lParam);
         io.MousePos.y = (signed short)(lParam >> 16);

examples/directx11_example/imgui_impl_dx11.cpp

@@ -282,6 +282,9 @@ IMGUI_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wPa
     case WM_MOUSEWHEEL:
         io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
         return 0;
+    case WM_MOUSEHWHEEL:
+        io.MouseWheelH += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        return 0;
     case WM_MOUSEMOVE:
         io.MousePos.x = (signed short)(lParam);
         io.MousePos.y = (signed short)(lParam >> 16);

examples/directx9_example/imgui_impl_dx9.cpp

@@ -221,6 +221,9 @@ IMGUI_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wPa
     case WM_MOUSEWHEEL:
         io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
         return 0;
+    case WM_MOUSEHWHEEL:
+        io.MouseWheelH += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        return 0;
     case WM_MOUSEMOVE:
         io.MousePos.x = (signed short)(lParam);
         io.MousePos.y = (signed short)(lParam >> 16);

examples/vulkan_example/imgui_impl_glfw_vulkan.cpp

@@ -25,7 +25,7 @@
 static GLFWwindow*  g_Window = NULL;
 static double       g_Time = 0.0f;
 static bool         g_MousePressed[3] = { false, false, false };
-static float        g_MouseWheel = 0.0f;
+static ImVec2       g_MouseWheel = ImVec2(0.0f, 0.0f);
 
 // Vulkan Data
 static VkAllocationCallbacks* g_Allocator = NULL;
@@ -330,9 +330,10 @@ void ImGui_ImplGlfwVulkan_MouseButtonCallback(GLFWwindow*, int button, int actio
         g_MousePressed[button] = true;
 }
 
-void ImGui_ImplGlfwVulkan_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
+void ImGui_ImplGlfwVulkan_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
 {
-    g_MouseWheel += (float)yoffset; // Use fractional mouse wheel.
+    g_MouseWheel.x += (float)xoffset; // Use fractional mouse wheel.
+    g_MouseWheel.y += (float)yoffset;
 }
 
 void ImGui_ImplGlfwVulkan_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
@@ -825,8 +826,9 @@ void ImGui_ImplGlfwVulkan_NewFrame()
         g_MousePressed[i] = false;
     }
 
-    io.MouseWheel = g_MouseWheel;
-    g_MouseWheel = 0.0f;
+    io.MouseWheel = g_MouseWheel.y;
+    io.MouseWheelH = g_MouseWheel.x;
+    g_MouseWheel.x = g_MouseWheel.x = 0.0f;
 
     // Hide OS mouse cursor if ImGui is drawing it
     glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);