// dear imgui: Platform Backend for OSX / Cocoa // This needs to be used along with a Renderer (e.g. OpenGL2, OpenGL3, Vulkan, Metal..) // [ALPHA] Early backend, not well tested. If you want a portable application, prefer using the GLFW or SDL platform Backends on Mac. // Implemented features: // [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. // [X] Platform: OSX clipboard is supported within core Dear ImGui (no specific code in this backend). // Issues: // [ ] Platform: Keys are all generally very broken. Best using [event keycode] and not [event characters].. // [ ] Platform: Multi-viewport / platform windows. // You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. // Read online: https://github.com/ocornut/imgui/tree/master/docs #include "imgui.h" #include "imgui_impl_osx.h" #import <Cocoa/Cocoa.h> // CHANGELOG // (minor and older changes stripped away, please see git history for details) // 2020-05-25: Inputs: Added a fix for missing trackpad clicks when done with "soft tap". // 2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor. // 2019-10-11: Inputs: Fix using Backspace key. // 2019-07-21: Re-added clipboard handlers as they are not enabled by default in core imgui.cpp (reverted 2019-05-18 change). // 2019-05-28: Inputs: Added mouse cursor shape and visibility support. // 2019-05-18: Misc: Removed clipboard handlers as they are now supported by core imgui.cpp. // 2019-05-11: Inputs: Don't filter character values before calling AddInputCharacter() apart from 0xF700..0xFFFF range. // 2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window. // 2018-07-07: Initial version. // Data static CFAbsoluteTime g_Time = 0.0; static NSCursor* g_MouseCursors[ImGuiMouseCursor_COUNT] = {}; static bool g_MouseCursorHidden = false; static bool g_MouseJustPressed[ImGuiMouseButton_COUNT] = {}; static bool g_MouseDown[ImGuiMouseButton_COUNT] = {}; // Undocumented methods for creating cursors. @interface NSCursor() + (id)_windowResizeNorthWestSouthEastCursor; + (id)_windowResizeNorthEastSouthWestCursor; + (id)_windowResizeNorthSouthCursor; + (id)_windowResizeEastWestCursor; @end // Functions bool ImGui_ImplOSX_Init() { ImGuiIO& io = ImGui::GetIO(); // Setup backend capabilities flags io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional) //io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used) //io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports; // We can create multi-viewports on the Platform side (optional) //io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can set io.MouseHoveredViewport correctly (optional, not easy) io.BackendPlatformName = "imgui_impl_osx"; // Keyboard mapping. Dear ImGui will use those indices to peek into the io.KeyDown[] array. const int offset_for_function_keys = 256 - 0xF700; io.KeyMap[ImGuiKey_Tab] = '\t'; io.KeyMap[ImGuiKey_LeftArrow] = NSLeftArrowFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_RightArrow] = NSRightArrowFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_UpArrow] = NSUpArrowFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_DownArrow] = NSDownArrowFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_PageUp] = NSPageUpFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_PageDown] = NSPageDownFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_Home] = NSHomeFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_End] = NSEndFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_Insert] = NSInsertFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_Delete] = NSDeleteFunctionKey + offset_for_function_keys; io.KeyMap[ImGuiKey_Backspace] = 127; io.KeyMap[ImGuiKey_Space] = 32; io.KeyMap[ImGuiKey_Enter] = 13; io.KeyMap[ImGuiKey_Escape] = 27; io.KeyMap[ImGuiKey_KeyPadEnter] = 13; io.KeyMap[ImGuiKey_A] = 'A'; io.KeyMap[ImGuiKey_C] = 'C'; io.KeyMap[ImGuiKey_V] = 'V'; io.KeyMap[ImGuiKey_X] = 'X'; io.KeyMap[ImGuiKey_Y] = 'Y'; io.KeyMap[ImGuiKey_Z] = 'Z'; // Load cursors. Some of them are undocumented. g_MouseCursorHidden = false; g_MouseCursors[ImGuiMouseCursor_Arrow] = [NSCursor arrowCursor]; 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]; g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = [NSCursor respondsToSelector:@selector(_windowResizeNorthWestSouthEastCursor)] ? [NSCursor _windowResizeNorthWestSouthEastCursor] : [NSCursor closedHandCursor]; // Note that imgui.cpp also include default OSX clipboard handlers which can be enabled // by adding '#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS' in imconfig.h and adding '-framework ApplicationServices' to your linker command-line. // Since we are already in ObjC land here, it is easy for us to add a clipboard handler using the NSPasteboard api. io.SetClipboardTextFn = [](void*, const char* str) -> void { NSPasteboard* pasteboard = [NSPasteboard generalPasteboard]; [pasteboard declareTypes:[NSArray arrayWithObject:NSPasteboardTypeString] owner:nil]; [pasteboard setString:[NSString stringWithUTF8String:str] forType:NSPasteboardTypeString]; }; io.GetClipboardTextFn = [](void*) -> const char* { NSPasteboard* pasteboard = [NSPasteboard generalPasteboard]; NSString* available = [pasteboard availableTypeFromArray: [NSArray arrayWithObject:NSPasteboardTypeString]]; if (![available isEqualToString:NSPasteboardTypeString]) return NULL; NSString* string = [pasteboard stringForType:NSPasteboardTypeString]; if (string == nil) return NULL; const char* string_c = (const char*)[string UTF8String]; size_t string_len = strlen(string_c); static ImVector<char> s_clipboard; s_clipboard.resize((int)string_len + 1); strcpy(s_clipboard.Data, string_c); return s_clipboard.Data; }; return true; } void ImGui_ImplOSX_Shutdown() { } static void ImGui_ImplOSX_UpdateMouseCursorAndButtons() { // Update buttons ImGuiIO& io = ImGui::GetIO(); for (int i = 0; i < IM_ARRAYSIZE(io.MouseDown); i++) { // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. io.MouseDown[i] = g_MouseJustPressed[i] || g_MouseDown[i]; g_MouseJustPressed[i] = false; } if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) return; ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor(); if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None) { // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor if (!g_MouseCursorHidden) { g_MouseCursorHidden = true; [NSCursor hide]; } } else { // Show OS mouse cursor [g_MouseCursors[g_MouseCursors[imgui_cursor] ? imgui_cursor : ImGuiMouseCursor_Arrow] set]; if (g_MouseCursorHidden) { g_MouseCursorHidden = false; [NSCursor unhide]; } } } void ImGui_ImplOSX_NewFrame(NSView* view) { // Setup display size ImGuiIO& io = ImGui::GetIO(); if (view) { const float dpi = [view.window backingScaleFactor]; io.DisplaySize = ImVec2((float)view.bounds.size.width, (float)view.bounds.size.height); io.DisplayFramebufferScale = ImVec2(dpi, dpi); } // Setup time step if (g_Time == 0.0) g_Time = CFAbsoluteTimeGetCurrent(); CFAbsoluteTime current_time = CFAbsoluteTimeGetCurrent(); io.DeltaTime = current_time - g_Time; g_Time = current_time; ImGui_ImplOSX_UpdateMouseCursorAndButtons(); } static int mapCharacterToKey(int c) { if (c >= 'a' && c <= 'z') return c - 'a' + 'A'; if (c == 25) // SHIFT+TAB -> TAB return 9; if (c >= 0 && c < 256) return c; if (c >= 0xF700 && c < 0xF700 + 256) return c - 0xF700 + 256; return -1; } static void resetKeys() { ImGuiIO& io = ImGui::GetIO(); for (int n = 0; n < IM_ARRAYSIZE(io.KeysDown); n++) io.KeysDown[n] = false; } bool ImGui_ImplOSX_HandleEvent(NSEvent* event, NSView* view) { ImGuiIO& io = ImGui::GetIO(); if (event.type == NSEventTypeLeftMouseDown || event.type == NSEventTypeRightMouseDown || event.type == NSEventTypeOtherMouseDown) { int button = (int)[event buttonNumber]; if (button >= 0 && button < IM_ARRAYSIZE(g_MouseDown)) g_MouseDown[button] = g_MouseJustPressed[button] = true; return io.WantCaptureMouse; } if (event.type == NSEventTypeLeftMouseUp || event.type == NSEventTypeRightMouseUp || event.type == NSEventTypeOtherMouseUp) { int button = (int)[event buttonNumber]; if (button >= 0 && button < IM_ARRAYSIZE(g_MouseDown)) g_MouseDown[button] = false; return io.WantCaptureMouse; } if (event.type == NSEventTypeMouseMoved || event.type == NSEventTypeLeftMouseDragged) { NSPoint mousePoint = event.locationInWindow; mousePoint = [view convertPoint:mousePoint fromView:nil]; mousePoint = NSMakePoint(mousePoint.x, view.bounds.size.height - mousePoint.y); io.MousePos = ImVec2(mousePoint.x, mousePoint.y); } if (event.type == NSEventTypeScrollWheel) { double wheel_dx = 0.0; double wheel_dy = 0.0; #if MAC_OS_X_VERSION_MAX_ALLOWED >= 1070 if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_6) { wheel_dx = [event scrollingDeltaX]; wheel_dy = [event scrollingDeltaY]; if ([event hasPreciseScrollingDeltas]) { wheel_dx *= 0.1; wheel_dy *= 0.1; } } else #endif // MAC_OS_X_VERSION_MAX_ALLOWED { wheel_dx = [event deltaX]; wheel_dy = [event deltaY]; } if (fabs(wheel_dx) > 0.0) io.MouseWheelH += wheel_dx * 0.1f; if (fabs(wheel_dy) > 0.0) io.MouseWheel += wheel_dy * 0.1f; return io.WantCaptureMouse; } // FIXME: All the key handling is wrong and broken. Refer to GLFW's cocoa_init.mm and cocoa_window.mm. if (event.type == NSEventTypeKeyDown) { NSString* str = [event characters]; int len = (int)[str length]; for (int i = 0; i < len; i++) { int c = [str characterAtIndex:i]; if (!io.KeyCtrl && !(c >= 0xF700 && c <= 0xFFFF) && c != 127) io.AddInputCharacter((unsigned int)c); // We must reset in case we're pressing a sequence of special keys while keeping the command pressed int key = mapCharacterToKey(c); if (key != -1 && key < 256 && !io.KeyCtrl) resetKeys(); if (key != -1) io.KeysDown[key] = true; } return io.WantCaptureKeyboard; } if (event.type == NSEventTypeKeyUp) { NSString* str = [event characters]; int len = (int)[str length]; for (int i = 0; i < len; i++) { int c = [str characterAtIndex:i]; int key = mapCharacterToKey(c); if (key != -1) io.KeysDown[key] = false; } return io.WantCaptureKeyboard; } if (event.type == NSEventTypeFlagsChanged) { ImGuiIO& io = ImGui::GetIO(); unsigned int flags = [event modifierFlags] & NSEventModifierFlagDeviceIndependentFlagsMask; bool oldKeyCtrl = io.KeyCtrl; bool oldKeyShift = io.KeyShift; bool oldKeyAlt = io.KeyAlt; bool oldKeySuper = io.KeySuper; io.KeyCtrl = flags & NSEventModifierFlagControl; io.KeyShift = flags & NSEventModifierFlagShift; io.KeyAlt = flags & NSEventModifierFlagOption; io.KeySuper = flags & NSEventModifierFlagCommand; // We must reset them as we will not receive any keyUp event if they where pressed with a modifier if ((oldKeyShift && !io.KeyShift) || (oldKeyCtrl && !io.KeyCtrl) || (oldKeyAlt && !io.KeyAlt) || (oldKeySuper && !io.KeySuper)) resetKeys(); return io.WantCaptureKeyboard; } return false; }