235 lines
9.0 KiB
C++
235 lines
9.0 KiB
C++
// dear imgui: Platform Binding for Windows (standard windows API for 32 and 64 bits applications)
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// This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
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#include "imgui.h"
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#include "imgui_impl_win32.h"
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#include <tchar.h>
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// Win32 Data
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static HWND g_hWnd = 0;
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static INT64 g_Time = 0;
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static INT64 g_TicksPerSecond = 0;
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static ImGuiMouseCursor g_LastMouseCursor = ImGuiMouseCursor_COUNT;
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// Functions
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bool ImGui_ImplWin32_Init(void* hwnd)
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{
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if (!::QueryPerformanceFrequency((LARGE_INTEGER *)&g_TicksPerSecond))
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return false;
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if (!::QueryPerformanceCounter((LARGE_INTEGER *)&g_Time))
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return false;
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// Setup back-end capabilities flags
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g_hWnd = (HWND)hwnd;
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ImGuiIO& io = ImGui::GetIO();
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io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
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io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used)
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io.BackendPlatformName = "imgui_impl_win32";
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io.ImeWindowHandle = hwnd;
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// Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array that we will update during the application lifetime.
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io.KeyMap[ImGuiKey_Tab] = VK_TAB;
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io.KeyMap[ImGuiKey_LeftArrow] = VK_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = VK_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = VK_UP;
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io.KeyMap[ImGuiKey_DownArrow] = VK_DOWN;
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io.KeyMap[ImGuiKey_PageUp] = VK_PRIOR;
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io.KeyMap[ImGuiKey_PageDown] = VK_NEXT;
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io.KeyMap[ImGuiKey_Home] = VK_HOME;
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io.KeyMap[ImGuiKey_End] = VK_END;
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io.KeyMap[ImGuiKey_Insert] = VK_INSERT;
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io.KeyMap[ImGuiKey_Delete] = VK_DELETE;
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io.KeyMap[ImGuiKey_Backspace] = VK_BACK;
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io.KeyMap[ImGuiKey_Space] = VK_SPACE;
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io.KeyMap[ImGuiKey_Enter] = VK_RETURN;
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io.KeyMap[ImGuiKey_Escape] = VK_ESCAPE;
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io.KeyMap[ImGuiKey_A] = 'A';
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io.KeyMap[ImGuiKey_C] = 'C';
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io.KeyMap[ImGuiKey_V] = 'V';
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io.KeyMap[ImGuiKey_X] = 'X';
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io.KeyMap[ImGuiKey_Y] = 'Y';
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io.KeyMap[ImGuiKey_Z] = 'Z';
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return true;
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}
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void ImGui_ImplWin32_Shutdown()
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{
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g_hWnd = (HWND)0;
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}
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static bool ImGui_ImplWin32_UpdateMouseCursor()
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{
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ImGuiIO& io = ImGui::GetIO();
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if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
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return false;
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ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
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if (imgui_cursor == ImGuiMouseCursor_None || io.MouseDrawCursor)
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{
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// Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
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::SetCursor(NULL);
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}
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else
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{
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// Show OS mouse cursor
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LPTSTR win32_cursor = IDC_ARROW;
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switch (imgui_cursor)
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{
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case ImGuiMouseCursor_Arrow: win32_cursor = IDC_ARROW; break;
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case ImGuiMouseCursor_TextInput: win32_cursor = IDC_IBEAM; break;
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case ImGuiMouseCursor_ResizeAll: win32_cursor = IDC_SIZEALL; break;
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case ImGuiMouseCursor_ResizeEW: win32_cursor = IDC_SIZEWE; break;
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case ImGuiMouseCursor_ResizeNS: win32_cursor = IDC_SIZENS; break;
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case ImGuiMouseCursor_ResizeNESW: win32_cursor = IDC_SIZENESW; break;
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case ImGuiMouseCursor_ResizeNWSE: win32_cursor = IDC_SIZENWSE; break;
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case ImGuiMouseCursor_Hand: win32_cursor = IDC_HAND; break;
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}
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::SetCursor(::LoadCursor(NULL, win32_cursor));
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}
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return true;
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}
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static void ImGui_ImplWin32_UpdateMousePos()
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{
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ImGuiIO& io = ImGui::GetIO();
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// Set OS mouse position if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
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if (io.WantSetMousePos)
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{
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POINT pos = { (int)io.MousePos.x, (int)io.MousePos.y };
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::ClientToScreen(g_hWnd, &pos);
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::SetCursorPos(pos.x, pos.y);
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}
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// Set mouse position
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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POINT pos;
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if (HWND active_window = ::GetForegroundWindow())
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if (active_window == g_hWnd || ::IsChild(active_window, g_hWnd))
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if (::GetCursorPos(&pos) && ::ScreenToClient(g_hWnd, &pos))
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io.MousePos = ImVec2((float)pos.x, (float)pos.y);
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}
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void ImGui_ImplWin32_NewFrame()
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{
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ImGuiIO& io = ImGui::GetIO();
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IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer back-end. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
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// Setup display size (every frame to accommodate for window resizing)
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RECT rect;
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::GetClientRect(g_hWnd, &rect);
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io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));
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// Setup time step
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INT64 current_time;
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::QueryPerformanceCounter((LARGE_INTEGER *)¤t_time);
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io.DeltaTime = (float)(current_time - g_Time) / g_TicksPerSecond;
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g_Time = current_time;
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// Read keyboard modifiers inputs
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io.KeyCtrl = (::GetKeyState(VK_CONTROL) & 0x8000) != 0;
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io.KeyShift = (::GetKeyState(VK_SHIFT) & 0x8000) != 0;
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io.KeyAlt = (::GetKeyState(VK_MENU) & 0x8000) != 0;
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io.KeySuper = false;
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// io.KeysDown[], io.MousePos, io.MouseDown[], io.MouseWheel: filled by the WndProc handler below.
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// Update OS mouse position
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ImGui_ImplWin32_UpdateMousePos();
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// Update OS mouse cursor with the cursor requested by imgui
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ImGuiMouseCursor mouse_cursor = io.MouseDrawCursor ? ImGuiMouseCursor_None : ImGui::GetMouseCursor();
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if (g_LastMouseCursor != mouse_cursor)
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{
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g_LastMouseCursor = mouse_cursor;
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ImGui_ImplWin32_UpdateMouseCursor();
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}
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}
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// Allow compilation with old Windows SDK. MinGW doesn't have default _WIN32_WINNT/WINVER versions.
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#ifndef WM_MOUSEHWHEEL
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#define WM_MOUSEHWHEEL 0x020E
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#endif
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#ifndef DBT_DEVNODES_CHANGED
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#define DBT_DEVNODES_CHANGED 0x0007
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#endif
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// Process Win32 mouse/keyboard inputs.
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// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
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// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
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// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
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// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
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// PS: In this Win32 handler, we use the capture API (GetCapture/SetCapture/ReleaseCapture) to be able to read mouse coordinations when dragging mouse outside of our window bounds.
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// PS: We treat DBLCLK messages as regular mouse down messages, so this code will work on windows classes that have the CS_DBLCLKS flag set. Our own example app code doesn't set this flag.
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IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
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{
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if (ImGui::GetCurrentContext() == NULL)
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return 0;
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ImGuiIO& io = ImGui::GetIO();
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switch (msg)
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{
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case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK:
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case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK:
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case WM_MBUTTONDOWN: case WM_MBUTTONDBLCLK:
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case WM_XBUTTONDOWN: case WM_XBUTTONDBLCLK:
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{
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int button = 0;
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if (msg == WM_LBUTTONDOWN || msg == WM_LBUTTONDBLCLK) { button = 0; }
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if (msg == WM_RBUTTONDOWN || msg == WM_RBUTTONDBLCLK) { button = 1; }
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if (msg == WM_MBUTTONDOWN || msg == WM_MBUTTONDBLCLK) { button = 2; }
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if (msg == WM_XBUTTONDOWN || msg == WM_XBUTTONDBLCLK) { button = (GET_XBUTTON_WPARAM(wParam) == XBUTTON1) ? 3 : 4; }
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if (!ImGui::IsAnyMouseDown() && ::GetCapture() == NULL)
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::SetCapture(hwnd);
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io.MouseDown[button] = true;
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return 0;
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}
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case WM_LBUTTONUP:
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case WM_RBUTTONUP:
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case WM_MBUTTONUP:
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case WM_XBUTTONUP:
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{
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int button = 0;
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if (msg == WM_LBUTTONUP) { button = 0; }
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if (msg == WM_RBUTTONUP) { button = 1; }
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if (msg == WM_MBUTTONUP) { button = 2; }
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if (msg == WM_XBUTTONUP) { button = (GET_XBUTTON_WPARAM(wParam) == XBUTTON1) ? 3 : 4; }
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io.MouseDown[button] = false;
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if (!ImGui::IsAnyMouseDown() && ::GetCapture() == hwnd)
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::ReleaseCapture();
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return 0;
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}
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case WM_MOUSEWHEEL:
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io.MouseWheel += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
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return 0;
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case WM_MOUSEHWHEEL:
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io.MouseWheelH += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
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return 0;
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case WM_KEYDOWN:
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case WM_SYSKEYDOWN:
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if (wParam < 256)
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io.KeysDown[wParam] = 1;
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return 0;
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case WM_KEYUP:
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case WM_SYSKEYUP:
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if (wParam < 256)
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io.KeysDown[wParam] = 0;
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return 0;
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case WM_CHAR:
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// You can also use ToAscii()+GetKeyboardState() to retrieve characters.
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if (wParam > 0 && wParam < 0x10000)
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io.AddInputCharacter((unsigned short)wParam);
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return 0;
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case WM_SETCURSOR:
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if (LOWORD(lParam) == HTCLIENT && ImGui_ImplWin32_UpdateMouseCursor())
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return 1;
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return 0;
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}
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return 0;
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}
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