Implement ImGuiMouseCursor_NotAllowed mouse cursor.

examples/imgui_impl_allegro5.cpp

@@ -390,6 +390,7 @@ static void ImGui_ImplAllegro5_UpdateMouseCursor()
         case ImGuiMouseCursor_ResizeEW:     cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_E; break;
         case ImGuiMouseCursor_ResizeNESW:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NE; break;
         case ImGuiMouseCursor_ResizeNWSE:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NW; break;
+        case ImGuiMouseCursor_NotAllowed:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_UNAVAILABLE; break;
         }
         al_set_system_mouse_cursor(g_Display, cursor_id);
     }

examples/imgui_impl_glfw.cpp

@@ -179,10 +179,12 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_RESIZE_ALL_CURSOR);
     g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_RESIZE_NESW_CURSOR);
     g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_RESIZE_NWSE_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_NOT_ALLOWED_CURSOR);
 #else
     g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
     g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
     g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
 #endif
 
     // Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.

examples/imgui_impl_osx.mm

@@ -78,6 +78,7 @@ bool ImGui_ImplOSX_Init()
     g_MouseCursors[ImGuiMouseCursor_TextInput] = [NSCursor IBeamCursor];
     g_MouseCursors[ImGuiMouseCursor_ResizeAll] = [NSCursor closedHandCursor];
     g_MouseCursors[ImGuiMouseCursor_Hand] = [NSCursor pointingHandCursor];
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = [NSCursor operationNotAllowedCursor];
     g_MouseCursors[ImGuiMouseCursor_ResizeNS] = [NSCursor respondsToSelector:@selector(_windowResizeNorthSouthCursor)] ? [NSCursor _windowResizeNorthSouthCursor] : [NSCursor resizeUpDownCursor];
     g_MouseCursors[ImGuiMouseCursor_ResizeEW] = [NSCursor respondsToSelector:@selector(_windowResizeEastWestCursor)] ? [NSCursor _windowResizeEastWestCursor] : [NSCursor resizeLeftRightCursor];
     g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = [NSCursor respondsToSelector:@selector(_windowResizeNorthEastSouthWestCursor)] ? [NSCursor _windowResizeNorthEastSouthWestCursor] : [NSCursor closedHandCursor];

examples/imgui_impl_sdl.cpp

@@ -165,6 +165,7 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window)
     g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENESW);
     g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE);
     g_MouseCursors[ImGuiMouseCursor_Hand] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NO);
 
 #ifdef _WIN32
     SDL_SysWMinfo wmInfo;

examples/imgui_impl_win32.cpp

@@ -120,6 +120,7 @@ static bool ImGui_ImplWin32_UpdateMouseCursor()
         case ImGuiMouseCursor_ResizeNESW:   win32_cursor = IDC_SIZENESW; break;
         case ImGuiMouseCursor_ResizeNWSE:   win32_cursor = IDC_SIZENWSE; break;
         case ImGuiMouseCursor_Hand:         win32_cursor = IDC_HAND; break;
+        case ImGuiMouseCursor_NotAllowed:   win32_cursor = IDC_NO; break;
         }
         ::SetCursor(::LoadCursor(NULL, win32_cursor));
     }

imgui.h

@@ -1188,6 +1188,7 @@ enum ImGuiMouseCursor_
     ImGuiMouseCursor_ResizeNESW,        // When hovering over the bottom-left corner of a window
     ImGuiMouseCursor_ResizeNWSE,        // When hovering over the bottom-right corner of a window
     ImGuiMouseCursor_Hand,              // (Unused by Dear ImGui functions. Use for e.g. hyperlinks)
+    ImGuiMouseCursor_NotAllowed,        // When hovering something with disallowed interaction. Usually a crossed circle.
     ImGuiMouseCursor_COUNT
 
     // Obsolete names (will be removed)