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Backends: GLFW: inhibit error callback when creating cursors because X11 setups may be missing them + comment (#2980)

This commit is contained in:
omar 2020-01-17 11:36:56 +01:00
parent 9ad4c5da7e
commit aa34681652
1 changed files with 7 additions and 0 deletions
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7
examples/imgui_impl_glfw.cpp
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@ -15,6 +15,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2020-01-17: Inputs: Disable error callback while assigning mouse cursors because some X11 setup don't have them and it generates errors.
// 2019-12-05: Inputs: Added support for new mouse cursors added in GLFW 3.4+ (resizing cursors, not allowed cursor).
// 2019-10-18: Misc: Previously installed user callbacks are now restored on shutdown.
// 2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
@ -175,6 +176,11 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
io.ImeWindowHandle = (void*)glfwGetWin32Window(g_Window);
#endif
// Create mouse cursors
// (By design, on X11 cursors are user configurable and some cursors may be missing. When a cursor doesn't exist,
// GLFW will emit an error which will often be printed by the app, so we temporarily disable error reporting.
// Missing cursors will return NULL and our _UpdateMouseCursor() function will use the Arrow cursor instead.)
GLFWerrorfun prev_error_callback = glfwSetErrorCallback(NULL);
g_MouseCursors[ImGuiMouseCursor_Arrow] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
g_MouseCursors[ImGuiMouseCursor_TextInput] = glfwCreateStandardCursor(GLFW_IBEAM_CURSOR);
g_MouseCursors[ImGuiMouseCursor_ResizeNS] = glfwCreateStandardCursor(GLFW_VRESIZE_CURSOR);
@ -191,6 +197,7 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
#endif
glfwSetErrorCallback(prev_error_callback);
// Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.
g_PrevUserCallbackMousebutton = NULL;