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Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
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imgui-docking/backends/imgui_impl_win32.cpp

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// dear imgui: Platform Backend for Windows (standard windows API for 32 and 64 bits applications)
// This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
// Implemented features:
// [X] Platform: Clipboard support (for Win32 this is actually part of core dear imgui)
// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
// [X] Platform: Keyboard arrays indexed using VK_* Virtual Key Codes, e.g. ImGui::IsKeyPressed(VK_SPACE).
// [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
// [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
// 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_win32.h"
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <tchar.h>
#include <dwmapi.h>
// Configuration flags to add in your imconfig.h file:
//#define IMGUI_IMPL_WIN32_DISABLE_GAMEPAD // Disable gamepad support. This was meaningful before <1.81 but we now load XInput dynamically so the option is now less relevant.
// Using XInput for gamepad (will load DLL dynamically)
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
#include <xinput.h>
typedef DWORD (WINAPI *PFN_XInputGetCapabilities)(DWORD, DWORD, XINPUT_CAPABILITIES*);
typedef DWORD (WINAPI *PFN_XInputGetState)(DWORD, XINPUT_STATE*);
#endif
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
// 2021-08-17: Calling io.AddFocusEvent() on WM_SETFOCUS/WM_KILLFOCUS messages.
// 2021-08-02: Inputs: Fixed keyboard modifiers being reported when host windo doesn't have focus.
// 2021-07-29: Inputs: MousePos is correctly reported when the host platform window is hovered but not focused (using TrackMouseEvent() to receive WM_MOUSELEAVE events).
// 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
// 2021-06-08: Fixed ImGui_ImplWin32_EnableDpiAwareness() and ImGui_ImplWin32_GetDpiScaleForMonitor() to handle Windows 8.1/10 features without a manifest (per-monitor DPI, and properly calls SetProcessDpiAwareness() on 8.1).
// 2021-03-23: Inputs: Clearing keyboard down array when losing focus (WM_KILLFOCUS).
// 2021-02-18: Added ImGui_ImplWin32_EnableAlphaCompositing(). Non Visual Studio users will need to link with dwmapi.lib (MinGW/gcc: use -ldwmapi).
// 2021-02-17: Fixed ImGui_ImplWin32_EnableDpiAwareness() attempting to get SetProcessDpiAwareness from shcore.dll on Windows 8 whereas it is only supported on Windows 8.1.
// 2021-01-25: Inputs: Dynamically loading XInput DLL.
// 2020-12-04: Misc: Fixed setting of io.DisplaySize to invalid/uninitialized data when after hwnd has been closed.
// 2020-03-03: Inputs: Calling AddInputCharacterUTF16() to support surrogate pairs leading to codepoint >= 0x10000 (for more complete CJK inputs)
// 2020-02-17: Added ImGui_ImplWin32_EnableDpiAwareness(), ImGui_ImplWin32_GetDpiScaleForHwnd(), ImGui_ImplWin32_GetDpiScaleForMonitor() helper functions.
// 2020-01-14: Inputs: Added support for #define IMGUI_IMPL_WIN32_DISABLE_GAMEPAD/IMGUI_IMPL_WIN32_DISABLE_LINKING_XINPUT.
// 2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor.
// 2019-05-11: Inputs: Don't filter value from WM_CHAR before calling AddInputCharacter().
// 2019-01-17: Misc: Using GetForegroundWindow()+IsChild() instead of GetActiveWindow() to be compatible with windows created in a different thread or parent.
// 2019-01-17: Inputs: Added support for mouse buttons 4 and 5 via WM_XBUTTON* messages.
// 2019-01-15: Inputs: Added support for XInput gamepads (if ImGuiConfigFlags_NavEnableGamepad is set by user application).
// 2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window.
// 2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor.
// 2018-06-10: Inputs: Fixed handling of mouse wheel messages to support fine position messages (typically sent by track-pads).
// 2018-06-08: Misc: Extracted imgui_impl_win32.cpp/.h away from the old combined DX9/DX10/DX11/DX12 examples.
// 2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors and ImGuiBackendFlags_HasSetMousePos flags + honor ImGuiConfigFlags_NoMouseCursorChange flag.
// 2018-02-20: Inputs: Added support for mouse cursors (ImGui::GetMouseCursor() value and WM_SETCURSOR message handling).
// 2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
// 2018-02-06: Inputs: Honoring the io.WantSetMousePos by repositioning the mouse (when using navigation and ImGuiConfigFlags_NavMoveMouse is set).
// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
// 2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
// 2018-01-08: Inputs: Added mapping for ImGuiKey_Insert.
// 2018-01-05: Inputs: Added WM_LBUTTONDBLCLK double-click handlers for window classes with the CS_DBLCLKS flag.
// 2017-10-23: Inputs: Added WM_SYSKEYDOWN / WM_SYSKEYUP handlers so e.g. the VK_MENU key can be read.
// 2017-10-23: Inputs: Using Win32 ::SetCapture/::GetCapture() to retrieve mouse positions outside the client area when dragging.
// 2016-11-12: Inputs: Only call Win32 ::SetCursor(NULL) when io.MouseDrawCursor is set.
// Forward Declarations
static void ImGui_ImplWin32_InitPlatformInterface();
static void ImGui_ImplWin32_ShutdownPlatformInterface();
static void ImGui_ImplWin32_UpdateMonitors();
struct ImGui_ImplWin32_Data
{
HWND hWnd;
HWND MouseHwnd;
bool MouseTracked;
INT64 Time;
INT64 TicksPerSecond;
ImGuiMouseCursor LastMouseCursor;
bool HasGamepad;
bool WantUpdateHasGamepad;
bool WantUpdateMonitors;
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
HMODULE XInputDLL;
PFN_XInputGetCapabilities XInputGetCapabilities;
PFN_XInputGetState XInputGetState;
#endif
ImGui_ImplWin32_Data() { memset(this, 0, sizeof(*this)); }
};
// Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts
// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
// FIXME: multi-context support is not well tested and probably dysfunctional in this backend.
// FIXME: some shared resources (mouse cursor shape, gamepad) are mishandled when using multi-context.
static ImGui_ImplWin32_Data* ImGui_ImplWin32_GetBackendData()
{
return ImGui::GetCurrentContext() ? (ImGui_ImplWin32_Data*)ImGui::GetIO().BackendPlatformUserData : NULL;
}
// Functions
bool ImGui_ImplWin32_Init(void* hwnd)
{
ImGuiIO& io = ImGui::GetIO();
IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
INT64 perf_frequency, perf_counter;
if (!::QueryPerformanceFrequency((LARGE_INTEGER*)&perf_frequency))
return false;
if (!::QueryPerformanceCounter((LARGE_INTEGER*)&perf_counter))
return false;
// Setup backend capabilities flags
ImGui_ImplWin32_Data* bd = IM_NEW(ImGui_ImplWin32_Data)();
io.BackendPlatformUserData = (void*)bd;
io.BackendPlatformName = "imgui_impl_win32";
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)
bd->hWnd = (HWND)hwnd;
bd->WantUpdateHasGamepad = true;
bd->WantUpdateMonitors = true;
bd->TicksPerSecond = perf_frequency;
bd->Time = perf_counter;
bd->LastMouseCursor = ImGuiMouseCursor_COUNT;
// Our mouse update function expect PlatformHandle to be filled for the main viewport
ImGuiViewport* main_viewport = ImGui::GetMainViewport();
main_viewport->PlatformHandle = main_viewport->PlatformHandleRaw = (void*)bd->hWnd;
if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
ImGui_ImplWin32_InitPlatformInterface();
// Keyboard mapping. Dear ImGui will use those indices to peek into the io.KeysDown[] array that we will update during the application lifetime.
io.KeyMap[ImGuiKey_Tab] = VK_TAB;
io.KeyMap[ImGuiKey_LeftArrow] = VK_LEFT;
io.KeyMap[ImGuiKey_RightArrow] = VK_RIGHT;
io.KeyMap[ImGuiKey_UpArrow] = VK_UP;
io.KeyMap[ImGuiKey_DownArrow] = VK_DOWN;
io.KeyMap[ImGuiKey_PageUp] = VK_PRIOR;
io.KeyMap[ImGuiKey_PageDown] = VK_NEXT;
io.KeyMap[ImGuiKey_Home] = VK_HOME;
io.KeyMap[ImGuiKey_End] = VK_END;
io.KeyMap[ImGuiKey_Insert] = VK_INSERT;
io.KeyMap[ImGuiKey_Delete] = VK_DELETE;
io.KeyMap[ImGuiKey_Backspace] = VK_BACK;
io.KeyMap[ImGuiKey_Space] = VK_SPACE;
io.KeyMap[ImGuiKey_Enter] = VK_RETURN;
io.KeyMap[ImGuiKey_Escape] = VK_ESCAPE;
io.KeyMap[ImGuiKey_KeyPadEnter] = VK_RETURN;
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';
// Dynamically load XInput library
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
const char* xinput_dll_names[] =
{
"xinput1_4.dll", // Windows 8+
"xinput1_3.dll", // DirectX SDK
"xinput9_1_0.dll", // Windows Vista, Windows 7
"xinput1_2.dll", // DirectX SDK
"xinput1_1.dll" // DirectX SDK
};
for (int n = 0; n < IM_ARRAYSIZE(xinput_dll_names); n++)
if (HMODULE dll = ::LoadLibraryA(xinput_dll_names[n]))
{
bd->XInputDLL = dll;
bd->XInputGetCapabilities = (PFN_XInputGetCapabilities)::GetProcAddress(dll, "XInputGetCapabilities");
bd->XInputGetState = (PFN_XInputGetState)::GetProcAddress(dll, "XInputGetState");
break;
}
#endif // IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
return true;
}
void ImGui_ImplWin32_Shutdown()
{
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
IM_ASSERT(bd != NULL && "No platform backend to shutdown, or already shutdown?");
ImGuiIO& io = ImGui::GetIO();
ImGui_ImplWin32_ShutdownPlatformInterface();
// Unload XInput library
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
if (bd->XInputDLL)
::FreeLibrary(bd->XInputDLL);
#endif // IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
io.BackendPlatformName = NULL;
io.BackendPlatformUserData = NULL;
IM_DELETE(bd);
}
static bool ImGui_ImplWin32_UpdateMouseCursor()
{
ImGuiIO& io = ImGui::GetIO();
if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
return false;
ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
if (imgui_cursor == ImGuiMouseCursor_None || io.MouseDrawCursor)
{
// Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
::SetCursor(NULL);
}
else
{
// Show OS mouse cursor
LPTSTR win32_cursor = IDC_ARROW;
switch (imgui_cursor)
{
case ImGuiMouseCursor_Arrow: win32_cursor = IDC_ARROW; break;
case ImGuiMouseCursor_TextInput: win32_cursor = IDC_IBEAM; break;
case ImGuiMouseCursor_ResizeAll: win32_cursor = IDC_SIZEALL; break;
case ImGuiMouseCursor_ResizeEW: win32_cursor = IDC_SIZEWE; break;
case ImGuiMouseCursor_ResizeNS: win32_cursor = IDC_SIZENS; break;
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));
}
return true;
}
// This code supports multi-viewports (multiple OS Windows mapped into different Dear ImGui viewports)
// Because of that, it is a little more complicated than your typical single-viewport binding code!
static void ImGui_ImplWin32_UpdateMousePos()
{
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
ImGuiIO& io = ImGui::GetIO();
IM_ASSERT(bd->hWnd != 0);
const ImVec2 mouse_pos_prev = io.MousePos;
io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
io.MouseHoveredViewport = 0;
// Obtain focused and hovered window. We forward mouse input when focused or when hovered (and no other window is capturing)
HWND focused_window = ::GetForegroundWindow();
HWND hovered_window = bd->MouseHwnd;
HWND mouse_window = NULL;
if (hovered_window && (hovered_window == bd->hWnd || ::IsChild(hovered_window, bd->hWnd) || ImGui::FindViewportByPlatformHandle((void*)hovered_window)))
mouse_window = hovered_window;
else if (focused_window && (focused_window == bd->hWnd || ::IsChild(focused_window, bd->hWnd) || ImGui::FindViewportByPlatformHandle((void*)focused_window)))
mouse_window = focused_window;
if (mouse_window == NULL)
return;
// Set OS mouse position from Dear ImGui if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
// (When multi-viewports are enabled, all Dear ImGui positions are same as OS positions)
if (io.WantSetMousePos)
{
POINT pos = { (int)mouse_pos_prev.x, (int)mouse_pos_prev.y };
if ((io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) == 0)
::ClientToScreen(mouse_window, &pos);
::SetCursorPos(pos.x, pos.y);
}
// Set Dear ImGui mouse position from OS position
POINT mouse_screen_pos;
if (!::GetCursorPos(&mouse_screen_pos))
return;
if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
{
// Multi-viewport mode: mouse position in OS absolute coordinates (io.MousePos is (0,0) when the mouse is on the upper-left of the primary monitor)
// This is the position you can get with ::GetCursorPos() or WM_MOUSEMOVE + ::ClientToScreen(). In theory adding viewport->Pos to a client position would also be the same.
io.MousePos = ImVec2((float)mouse_screen_pos.x, (float)mouse_screen_pos.y);
}
else
{
// Single viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
// This is the position you can get with ::GetCursorPos() + ::ScreenToClient() or WM_MOUSEMOVE.
POINT mouse_client_pos = mouse_screen_pos;
::ScreenToClient(bd->hWnd, &mouse_client_pos);
io.MousePos = ImVec2((float)mouse_client_pos.x, (float)mouse_client_pos.y);
}
// (Optional) When using multiple viewports: set io.MouseHoveredViewport to the viewport the OS mouse cursor is hovering.
// Important: this information is not easy to provide and many high-level windowing library won't be able to provide it correctly, because
// - This is _ignoring_ viewports with the ImGuiViewportFlags_NoInputs flag (pass-through windows).
// - This is _regardless_ of whether another viewport is focused or being dragged from.
// If ImGuiBackendFlags_HasMouseHoveredViewport is not set by the backend, imgui will ignore this field and infer the information by relying on the
// rectangles and last focused time of every viewports it knows about. It will be unaware of foreign windows that may be sitting between or over your windows.
if (HWND hovered_hwnd = ::WindowFromPoint(mouse_screen_pos))
if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle((void*)hovered_hwnd))
if ((viewport->Flags & ImGuiViewportFlags_NoInputs) == 0) // FIXME: We still get our NoInputs window with WM_NCHITTEST/HTTRANSPARENT code when decorated?
io.MouseHoveredViewport = viewport->ID;
}
// Gamepad navigation mapping
static void ImGui_ImplWin32_UpdateGamepads()
{
#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
ImGuiIO& io = ImGui::GetIO();
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
memset(io.NavInputs, 0, sizeof(io.NavInputs));
if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
return;
// Calling XInputGetState() every frame on disconnected gamepads is unfortunately too slow.
// Instead we refresh gamepad availability by calling XInputGetCapabilities() _only_ after receiving WM_DEVICECHANGE.
if (bd->WantUpdateHasGamepad)
{
XINPUT_CAPABILITIES caps;
bd->HasGamepad = bd->XInputGetCapabilities ? (bd->XInputGetCapabilities(0, XINPUT_FLAG_GAMEPAD, &caps) == ERROR_SUCCESS) : false;
bd->WantUpdateHasGamepad = false;
}
io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
XINPUT_STATE xinput_state;
if (bd->HasGamepad && bd->XInputGetState && bd->XInputGetState(0, &xinput_state) == ERROR_SUCCESS)
{
const XINPUT_GAMEPAD& gamepad = xinput_state.Gamepad;
io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
#define MAP_BUTTON(NAV_NO, BUTTON_ENUM) { io.NavInputs[NAV_NO] = (gamepad.wButtons & BUTTON_ENUM) ? 1.0f : 0.0f; }
#define MAP_ANALOG(NAV_NO, VALUE, V0, V1) { float vn = (float)(VALUE - V0) / (float)(V1 - V0); if (vn > 1.0f) vn = 1.0f; if (vn > 0.0f && io.NavInputs[NAV_NO] < vn) io.NavInputs[NAV_NO] = vn; }
MAP_BUTTON(ImGuiNavInput_Activate, XINPUT_GAMEPAD_A); // Cross / A
MAP_BUTTON(ImGuiNavInput_Cancel, XINPUT_GAMEPAD_B); // Circle / B
MAP_BUTTON(ImGuiNavInput_Menu, XINPUT_GAMEPAD_X); // Square / X
MAP_BUTTON(ImGuiNavInput_Input, XINPUT_GAMEPAD_Y); // Triangle / Y
MAP_BUTTON(ImGuiNavInput_DpadLeft, XINPUT_GAMEPAD_DPAD_LEFT); // D-Pad Left
MAP_BUTTON(ImGuiNavInput_DpadRight, XINPUT_GAMEPAD_DPAD_RIGHT); // D-Pad Right
MAP_BUTTON(ImGuiNavInput_DpadUp, XINPUT_GAMEPAD_DPAD_UP); // D-Pad Up
MAP_BUTTON(ImGuiNavInput_DpadDown, XINPUT_GAMEPAD_DPAD_DOWN); // D-Pad Down
MAP_BUTTON(ImGuiNavInput_FocusPrev, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_FocusNext, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
MAP_BUTTON(ImGuiNavInput_TweakSlow, XINPUT_GAMEPAD_LEFT_SHOULDER); // L1 / LB
MAP_BUTTON(ImGuiNavInput_TweakFast, XINPUT_GAMEPAD_RIGHT_SHOULDER); // R1 / RB
MAP_ANALOG(ImGuiNavInput_LStickLeft, gamepad.sThumbLX, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32768);
MAP_ANALOG(ImGuiNavInput_LStickRight, gamepad.sThumbLX, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
MAP_ANALOG(ImGuiNavInput_LStickUp, gamepad.sThumbLY, +XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, +32767);
MAP_ANALOG(ImGuiNavInput_LStickDown, gamepad.sThumbLY, -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE, -32767);
#undef MAP_BUTTON
#undef MAP_ANALOG
}
#endif // #ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
}
static BOOL CALLBACK ImGui_ImplWin32_UpdateMonitors_EnumFunc(HMONITOR monitor, HDC, LPRECT, LPARAM)
{
MONITORINFO info = {};
info.cbSize = sizeof(MONITORINFO);
if (!::GetMonitorInfo(monitor, &info))
return TRUE;
ImGuiPlatformMonitor imgui_monitor;
imgui_monitor.MainPos = ImVec2((float)info.rcMonitor.left, (float)info.rcMonitor.top);
imgui_monitor.MainSize = ImVec2((float)(info.rcMonitor.right - info.rcMonitor.left), (float)(info.rcMonitor.bottom - info.rcMonitor.top));
imgui_monitor.WorkPos = ImVec2((float)info.rcWork.left, (float)info.rcWork.top);
imgui_monitor.WorkSize = ImVec2((float)(info.rcWork.right - info.rcWork.left), (float)(info.rcWork.bottom - info.rcWork.top));
imgui_monitor.DpiScale = ImGui_ImplWin32_GetDpiScaleForMonitor(monitor);
ImGuiPlatformIO& io = ImGui::GetPlatformIO();
if (info.dwFlags & MONITORINFOF_PRIMARY)
io.Monitors.push_front(imgui_monitor);
else
io.Monitors.push_back(imgui_monitor);
return TRUE;
}
static void ImGui_ImplWin32_UpdateMonitors()
{
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
ImGui::GetPlatformIO().Monitors.resize(0);
::EnumDisplayMonitors(NULL, NULL, ImGui_ImplWin32_UpdateMonitors_EnumFunc, 0);
bd->WantUpdateMonitors = false;
}
void ImGui_ImplWin32_NewFrame()
{
ImGuiIO& io = ImGui::GetIO();
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
IM_ASSERT(bd != NULL && "Did you call ImGui_ImplWin32_Init()?");
// Setup display size (every frame to accommodate for window resizing)
RECT rect = { 0, 0, 0, 0 };
::GetClientRect(bd->hWnd, &rect);
io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));
if (bd->WantUpdateMonitors)
ImGui_ImplWin32_UpdateMonitors();
// Setup time step
INT64 current_time = 0;
::QueryPerformanceCounter((LARGE_INTEGER*)&current_time);
io.DeltaTime = (float)(current_time - bd->Time) / bd->TicksPerSecond;
bd->Time = current_time;
// Update OS mouse position
ImGui_ImplWin32_UpdateMousePos();
// Update OS mouse cursor with the cursor requested by imgui
ImGuiMouseCursor mouse_cursor = io.MouseDrawCursor ? ImGuiMouseCursor_None : ImGui::GetMouseCursor();
if (bd->LastMouseCursor != mouse_cursor)
{
bd->LastMouseCursor = mouse_cursor;
ImGui_ImplWin32_UpdateMouseCursor();
}
// Update game controllers (if enabled and available)
ImGui_ImplWin32_UpdateGamepads();
}
// Allow compilation with old Windows SDK. MinGW doesn't have default _WIN32_WINNT/WINVER versions.
#ifndef WM_MOUSEHWHEEL
#define WM_MOUSEHWHEEL 0x020E
#endif
#ifndef DBT_DEVNODES_CHANGED
#define DBT_DEVNODES_CHANGED 0x0007
#endif
// Win32 message handler (process Win32 mouse/keyboard inputs, etc.)
// Call from your application's message handler.
// When implementing your own backend, you can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if Dear ImGui wants to use your inputs.
// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
// Generally you may always pass all inputs to Dear ImGui, and hide them from your application based on those two flags.
// PS: In this Win32 handler, we use the capture API (GetCapture/SetCapture/ReleaseCapture) to be able to read mouse coordinates when dragging mouse outside of our window bounds.
// 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.
#if 0
// Copy this line into your .cpp file to forward declare the function.
extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
#endif
IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
if (ImGui::GetCurrentContext() == NULL)
return 0;
ImGuiIO& io = ImGui::GetIO();
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
switch (msg)
{
case WM_MOUSEMOVE:
// We need to call TrackMouseEvent in order to receive WM_MOUSELEAVE events
bd->MouseHwnd = hwnd;
if (!bd->MouseTracked)
{
TRACKMOUSEEVENT tme = { sizeof(tme), TME_LEAVE, hwnd, 0 };
::TrackMouseEvent(&tme);
bd->MouseTracked = true;
}
break;
case WM_MOUSELEAVE:
if (bd->MouseHwnd == hwnd)
bd->MouseHwnd = NULL;
bd->MouseTracked = false;
break;
case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK:
case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK:
case WM_MBUTTONDOWN: case WM_MBUTTONDBLCLK:
case WM_XBUTTONDOWN: case WM_XBUTTONDBLCLK:
{
int button = 0;
if (msg == WM_LBUTTONDOWN || msg == WM_LBUTTONDBLCLK) { button = 0; }
if (msg == WM_RBUTTONDOWN || msg == WM_RBUTTONDBLCLK) { button = 1; }
if (msg == WM_MBUTTONDOWN || msg == WM_MBUTTONDBLCLK) { button = 2; }
if (msg == WM_XBUTTONDOWN || msg == WM_XBUTTONDBLCLK) { button = (GET_XBUTTON_WPARAM(wParam) == XBUTTON1) ? 3 : 4; }
if (!ImGui::IsAnyMouseDown() && ::GetCapture() == NULL)
::SetCapture(hwnd);
io.MouseDown[button] = true;
return 0;
}
case WM_LBUTTONUP:
case WM_RBUTTONUP:
case WM_MBUTTONUP:
case WM_XBUTTONUP:
{
int button = 0;
if (msg == WM_LBUTTONUP) { button = 0; }
if (msg == WM_RBUTTONUP) { button = 1; }
if (msg == WM_MBUTTONUP) { button = 2; }
if (msg == WM_XBUTTONUP) { button = (GET_XBUTTON_WPARAM(wParam) == XBUTTON1) ? 3 : 4; }
io.MouseDown[button] = false;
if (!ImGui::IsAnyMouseDown() && ::GetCapture() == hwnd)
::ReleaseCapture();
return 0;
}
case WM_MOUSEWHEEL:
io.MouseWheel += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
return 0;
case WM_MOUSEHWHEEL:
io.MouseWheelH += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
return 0;
case WM_KEYDOWN:
case WM_KEYUP:
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
{
bool down = (msg == WM_KEYDOWN || msg == WM_SYSKEYDOWN);
if (wParam < 256)
io.KeysDown[wParam] = down;
if (wParam == VK_CONTROL)
io.KeyCtrl = down;
if (wParam == VK_SHIFT)
io.KeyShift = down;
if (wParam == VK_MENU)
io.KeyAlt = down;
return 0;
}
case WM_SETFOCUS:
case WM_KILLFOCUS:
io.AddFocusEvent(msg == WM_SETFOCUS);
return 0;
case WM_CHAR:
// You can also use ToAscii()+GetKeyboardState() to retrieve characters.
if (wParam > 0 && wParam < 0x10000)
io.AddInputCharacterUTF16((unsigned short)wParam);
return 0;
case WM_SETCURSOR:
if (LOWORD(lParam) == HTCLIENT && ImGui_ImplWin32_UpdateMouseCursor())
return 1;
return 0;
case WM_DEVICECHANGE:
if ((UINT)wParam == DBT_DEVNODES_CHANGED)
bd->WantUpdateHasGamepad = true;
return 0;
case WM_DISPLAYCHANGE:
bd->WantUpdateMonitors = true;
return 0;
}
return 0;
}
//--------------------------------------------------------------------------------------------------------
// DPI-related helpers (optional)
//--------------------------------------------------------------------------------------------------------
// - Use to enable DPI awareness without having to create an application manifest.
// - Your own app may already do this via a manifest or explicit calls. This is mostly useful for our examples/ apps.
// - In theory we could call simple functions from Windows SDK such as SetProcessDPIAware(), SetProcessDpiAwareness(), etc.
// but most of the functions provided by Microsoft require Windows 8.1/10+ SDK at compile time and Windows 8/10+ at runtime,
// neither we want to require the user to have. So we dynamically select and load those functions to avoid dependencies.
//---------------------------------------------------------------------------------------------------------
// This is the scheme successfully used by GLFW (from which we borrowed some of the code) and other apps aiming to be highly portable.
// ImGui_ImplWin32_EnableDpiAwareness() is just a helper called by main.cpp, we don't call it automatically.
// If you are trying to implement your own backend for your own engine, you may ignore that noise.
//---------------------------------------------------------------------------------------------------------
// Perform our own check with RtlVerifyVersionInfo() instead of using functions from <VersionHelpers.h> as they
// require a manifest to be functional for checks above 8.1. See https://github.com/ocornut/imgui/issues/4200
static BOOL _IsWindowsVersionOrGreater(WORD major, WORD minor, WORD)
{
typedef LONG(WINAPI* PFN_RtlVerifyVersionInfo)(OSVERSIONINFOEXW*, ULONG, ULONGLONG);
static PFN_RtlVerifyVersionInfo RtlVerifyVersionInfoFn = NULL;
if (RtlVerifyVersionInfoFn == NULL)
if (HMODULE ntdllModule = ::GetModuleHandleA("ntdll.dll"))
RtlVerifyVersionInfoFn = (PFN_RtlVerifyVersionInfo)GetProcAddress(ntdllModule, "RtlVerifyVersionInfo");
if (RtlVerifyVersionInfoFn == NULL)
return FALSE;
RTL_OSVERSIONINFOEXW versionInfo = { };
ULONGLONG conditionMask = 0;
versionInfo.dwOSVersionInfoSize = sizeof(RTL_OSVERSIONINFOEXW);
versionInfo.dwMajorVersion = major;
versionInfo.dwMinorVersion = minor;
VER_SET_CONDITION(conditionMask, VER_MAJORVERSION, VER_GREATER_EQUAL);
VER_SET_CONDITION(conditionMask, VER_MINORVERSION, VER_GREATER_EQUAL);
return (RtlVerifyVersionInfoFn(&versionInfo, VER_MAJORVERSION | VER_MINORVERSION, conditionMask) == 0) ? TRUE : FALSE;
}
#define _IsWindowsVistaOrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0600), LOBYTE(0x0600), 0) // _WIN32_WINNT_VISTA
#define _IsWindows8OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0602), LOBYTE(0x0602), 0) // _WIN32_WINNT_WIN8
#define _IsWindows8Point1OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0603), LOBYTE(0x0603), 0) // _WIN32_WINNT_WINBLUE
#define _IsWindows10OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0A00), LOBYTE(0x0A00), 0) // _WIN32_WINNT_WINTHRESHOLD / _WIN32_WINNT_WIN10
#ifndef DPI_ENUMS_DECLARED
typedef enum { PROCESS_DPI_UNAWARE = 0, PROCESS_SYSTEM_DPI_AWARE = 1, PROCESS_PER_MONITOR_DPI_AWARE = 2 } PROCESS_DPI_AWARENESS;
typedef enum { MDT_EFFECTIVE_DPI = 0, MDT_ANGULAR_DPI = 1, MDT_RAW_DPI = 2, MDT_DEFAULT = MDT_EFFECTIVE_DPI } MONITOR_DPI_TYPE;
#endif
#ifndef _DPI_AWARENESS_CONTEXTS_
DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE (DPI_AWARENESS_CONTEXT)-3
#endif
#ifndef DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 (DPI_AWARENESS_CONTEXT)-4
#endif
typedef HRESULT(WINAPI* PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS); // Shcore.lib + dll, Windows 8.1+
typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*); // Shcore.lib + dll, Windows 8.1+
typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1607+ (Creators Update)
// Helper function to enable DPI awareness without setting up a manifest
void ImGui_ImplWin32_EnableDpiAwareness()
{
// Make sure monitors will be updated with latest correct scaling
if (ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData())
bd->WantUpdateMonitors = true;
if (_IsWindows10OrGreater())
{
static HINSTANCE user32_dll = ::LoadLibraryA("user32.dll"); // Reference counted per-process
if (PFN_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContextFn = (PFN_SetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "SetThreadDpiAwarenessContext"))
{
SetThreadDpiAwarenessContextFn(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
return;
}
}
if (_IsWindows8Point1OrGreater())
{
static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
if (PFN_SetProcessDpiAwareness SetProcessDpiAwarenessFn = (PFN_SetProcessDpiAwareness)::GetProcAddress(shcore_dll, "SetProcessDpiAwareness"))
{
SetProcessDpiAwarenessFn(PROCESS_PER_MONITOR_DPI_AWARE);
return;
}
}
#if _WIN32_WINNT >= 0x0600
::SetProcessDPIAware();
#endif
}
#if defined(_MSC_VER) && !defined(NOGDI)
#pragma comment(lib, "gdi32") // Link with gdi32.lib for GetDeviceCaps(). MinGW will require linking with '-lgdi32'
#endif
float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
{
UINT xdpi = 96, ydpi = 96;
if (_IsWindows8Point1OrGreater())
{
static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
static PFN_GetDpiForMonitor GetDpiForMonitorFn = NULL;
if (GetDpiForMonitorFn == NULL && shcore_dll != NULL)
GetDpiForMonitorFn = (PFN_GetDpiForMonitor)::GetProcAddress(shcore_dll, "GetDpiForMonitor");
if (GetDpiForMonitorFn != NULL)
{
GetDpiForMonitorFn((HMONITOR)monitor, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
return xdpi / 96.0f;
}
}
#ifndef NOGDI
const HDC dc = ::GetDC(NULL);
xdpi = ::GetDeviceCaps(dc, LOGPIXELSX);
ydpi = ::GetDeviceCaps(dc, LOGPIXELSY);
IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
::ReleaseDC(NULL, dc);
#endif
return xdpi / 96.0f;
}
float ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd)
{
HMONITOR monitor = ::MonitorFromWindow((HWND)hwnd, MONITOR_DEFAULTTONEAREST);
return ImGui_ImplWin32_GetDpiScaleForMonitor(monitor);
}
//--------------------------------------------------------------------------------------------------------
// IME (Input Method Editor) basic support for e.g. Asian language users
//--------------------------------------------------------------------------------------------------------
#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY == WINAPI_FAMILY_APP) // UWP doesn't have Win32 functions
#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS
#endif
#if defined(_WIN32) && !defined(IMGUI_DISABLE_WIN32_FUNCTIONS) && !defined(IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS)
#define HAS_WIN32_IME 1
#include <imm.h>
#ifdef _MSC_VER
#pragma comment(lib, "imm32")
#endif
static void ImGui_ImplWin32_SetImeInputPos(ImGuiViewport* viewport, ImVec2 pos)
{
COMPOSITIONFORM cf = { CFS_FORCE_POSITION,{ (LONG)(pos.x - viewport->Pos.x), (LONG)(pos.y - viewport->Pos.y) },{ 0, 0, 0, 0 } };
if (HWND hwnd = (HWND)viewport->PlatformHandle)
if (HIMC himc = ::ImmGetContext(hwnd))
{
::ImmSetCompositionWindow(himc, &cf);
::ImmReleaseContext(hwnd, himc);
}
}
#else
#define HAS_WIN32_IME 0
#endif
//--------------------------------------------------------------------------------------------------------
// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
//--------------------------------------------------------------------------------------------------------
// Helper structure we store in the void* RenderUserData field of each ImGuiViewport to easily retrieve our backend data.
struct ImGui_ImplWin32_ViewportData
{
HWND Hwnd;
bool HwndOwned;
DWORD DwStyle;
DWORD DwExStyle;
ImGui_ImplWin32_ViewportData() { Hwnd = NULL; HwndOwned = false; DwStyle = DwExStyle = 0; }
~ImGui_ImplWin32_ViewportData() { IM_ASSERT(Hwnd == NULL); }
};
static void ImGui_ImplWin32_GetWin32StyleFromViewportFlags(ImGuiViewportFlags flags, DWORD* out_style, DWORD* out_ex_style)
{
if (flags & ImGuiViewportFlags_NoDecoration)
*out_style = WS_POPUP;
else
*out_style = WS_OVERLAPPEDWINDOW;
if (flags & ImGuiViewportFlags_NoTaskBarIcon)
*out_ex_style = WS_EX_TOOLWINDOW;
else
*out_ex_style = WS_EX_APPWINDOW;
if (flags & ImGuiViewportFlags_TopMost)
*out_ex_style |= WS_EX_TOPMOST;
}
static void ImGui_ImplWin32_CreateWindow(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = IM_NEW(ImGui_ImplWin32_ViewportData)();
viewport->PlatformUserData = vd;
// Select style and parent window
ImGui_ImplWin32_GetWin32StyleFromViewportFlags(viewport->Flags, &vd->DwStyle, &vd->DwExStyle);
HWND parent_window = NULL;
if (viewport->ParentViewportId != 0)
if (ImGuiViewport* parent_viewport = ImGui::FindViewportByID(viewport->ParentViewportId))
parent_window = (HWND)parent_viewport->PlatformHandle;
// Create window
RECT rect = { (LONG)viewport->Pos.x, (LONG)viewport->Pos.y, (LONG)(viewport->Pos.x + viewport->Size.x), (LONG)(viewport->Pos.y + viewport->Size.y) };
::AdjustWindowRectEx(&rect, vd->DwStyle, FALSE, vd->DwExStyle);
vd->Hwnd = ::CreateWindowEx(
vd->DwExStyle, _T("ImGui Platform"), _T("Untitled"), vd->DwStyle, // Style, class name, window name
rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, // Window area
parent_window, NULL, ::GetModuleHandle(NULL), NULL); // Parent window, Menu, Instance, Param
vd->HwndOwned = true;
viewport->PlatformRequestResize = false;
viewport->PlatformHandle = viewport->PlatformHandleRaw = vd->Hwnd;
}
static void ImGui_ImplWin32_DestroyWindow(ImGuiViewport* viewport)
{
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
if (ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData)
{
if (::GetCapture() == vd->Hwnd)
{
// Transfer capture so if we started dragging from a window that later disappears, we'll still receive the MOUSEUP event.
::ReleaseCapture();
::SetCapture(bd->hWnd);
}
if (vd->Hwnd && vd->HwndOwned)
::DestroyWindow(vd->Hwnd);
vd->Hwnd = NULL;
IM_DELETE(vd);
}
viewport->PlatformUserData = viewport->PlatformHandle = NULL;
}
static void ImGui_ImplWin32_ShowWindow(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
if (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing)
::ShowWindow(vd->Hwnd, SW_SHOWNA);
else
::ShowWindow(vd->Hwnd, SW_SHOW);
}
static void ImGui_ImplWin32_UpdateWindow(ImGuiViewport* viewport)
{
// (Optional) Update Win32 style if it changed _after_ creation.
// Generally they won't change unless configuration flags are changed, but advanced uses (such as manually rewriting viewport flags) make this useful.
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
DWORD new_style;
DWORD new_ex_style;
ImGui_ImplWin32_GetWin32StyleFromViewportFlags(viewport->Flags, &new_style, &new_ex_style);
// Only reapply the flags that have been changed from our point of view (as other flags are being modified by Windows)
if (vd->DwStyle != new_style || vd->DwExStyle != new_ex_style)
{
// (Optional) Update TopMost state if it changed _after_ creation
bool top_most_changed = (vd->DwExStyle & WS_EX_TOPMOST) != (new_ex_style & WS_EX_TOPMOST);
HWND insert_after = top_most_changed ? ((viewport->Flags & ImGuiViewportFlags_TopMost) ? HWND_TOPMOST : HWND_NOTOPMOST) : 0;
UINT swp_flag = top_most_changed ? 0 : SWP_NOZORDER;
// Apply flags and position (since it is affected by flags)
vd->DwStyle = new_style;
vd->DwExStyle = new_ex_style;
::SetWindowLong(vd->Hwnd, GWL_STYLE, vd->DwStyle);
::SetWindowLong(vd->Hwnd, GWL_EXSTYLE, vd->DwExStyle);
RECT rect = { (LONG)viewport->Pos.x, (LONG)viewport->Pos.y, (LONG)(viewport->Pos.x + viewport->Size.x), (LONG)(viewport->Pos.y + viewport->Size.y) };
::AdjustWindowRectEx(&rect, vd->DwStyle, FALSE, vd->DwExStyle); // Client to Screen
::SetWindowPos(vd->Hwnd, insert_after, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, swp_flag | SWP_NOACTIVATE | SWP_FRAMECHANGED);
::ShowWindow(vd->Hwnd, SW_SHOWNA); // This is necessary when we alter the style
viewport->PlatformRequestMove = viewport->PlatformRequestResize = true;
}
}
static ImVec2 ImGui_ImplWin32_GetWindowPos(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
POINT pos = { 0, 0 };
::ClientToScreen(vd->Hwnd, &pos);
return ImVec2((float)pos.x, (float)pos.y);
}
static void ImGui_ImplWin32_SetWindowPos(ImGuiViewport* viewport, ImVec2 pos)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
RECT rect = { (LONG)pos.x, (LONG)pos.y, (LONG)pos.x, (LONG)pos.y };
::AdjustWindowRectEx(&rect, vd->DwStyle, FALSE, vd->DwExStyle);
::SetWindowPos(vd->Hwnd, NULL, rect.left, rect.top, 0, 0, SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE);
}
static ImVec2 ImGui_ImplWin32_GetWindowSize(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
RECT rect;
::GetClientRect(vd->Hwnd, &rect);
return ImVec2(float(rect.right - rect.left), float(rect.bottom - rect.top));
}
static void ImGui_ImplWin32_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
RECT rect = { 0, 0, (LONG)size.x, (LONG)size.y };
::AdjustWindowRectEx(&rect, vd->DwStyle, FALSE, vd->DwExStyle); // Client to Screen
::SetWindowPos(vd->Hwnd, NULL, 0, 0, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
}
static void ImGui_ImplWin32_SetWindowFocus(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
::BringWindowToTop(vd->Hwnd);
::SetForegroundWindow(vd->Hwnd);
::SetFocus(vd->Hwnd);
}
static bool ImGui_ImplWin32_GetWindowFocus(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
return ::GetForegroundWindow() == vd->Hwnd;
}
static bool ImGui_ImplWin32_GetWindowMinimized(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
return ::IsIconic(vd->Hwnd) != 0;
}
static void ImGui_ImplWin32_SetWindowTitle(ImGuiViewport* viewport, const char* title)
{
// ::SetWindowTextA() doesn't properly handle UTF-8 so we explicitely convert our string.
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
int n = ::MultiByteToWideChar(CP_UTF8, 0, title, -1, NULL, 0);
ImVector<wchar_t> title_w;
title_w.resize(n);
::MultiByteToWideChar(CP_UTF8, 0, title, -1, title_w.Data, n);
::SetWindowTextW(vd->Hwnd, title_w.Data);
}
static void ImGui_ImplWin32_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
IM_ASSERT(alpha >= 0.0f && alpha <= 1.0f);
if (alpha < 1.0f)
{
DWORD style = ::GetWindowLongW(vd->Hwnd, GWL_EXSTYLE) | WS_EX_LAYERED;
::SetWindowLongW(vd->Hwnd, GWL_EXSTYLE, style);
::SetLayeredWindowAttributes(vd->Hwnd, 0, (BYTE)(255 * alpha), LWA_ALPHA);
}
else
{
DWORD style = ::GetWindowLongW(vd->Hwnd, GWL_EXSTYLE) & ~WS_EX_LAYERED;
::SetWindowLongW(vd->Hwnd, GWL_EXSTYLE, style);
}
}
static float ImGui_ImplWin32_GetWindowDpiScale(ImGuiViewport* viewport)
{
ImGui_ImplWin32_ViewportData* vd = (ImGui_ImplWin32_ViewportData*)viewport->PlatformUserData;
IM_ASSERT(vd->Hwnd != 0);
return ImGui_ImplWin32_GetDpiScaleForHwnd(vd->Hwnd);
}
// FIXME-DPI: Testing DPI related ideas
static void ImGui_ImplWin32_OnChangedViewport(ImGuiViewport* viewport)
{
(void)viewport;
#if 0
ImGuiStyle default_style;
//default_style.WindowPadding = ImVec2(0, 0);
//default_style.WindowBorderSize = 0.0f;
//default_style.ItemSpacing.y = 3.0f;
//default_style.FramePadding = ImVec2(0, 0);
default_style.ScaleAllSizes(viewport->DpiScale);
ImGuiStyle& style = ImGui::GetStyle();
style = default_style;
#endif
}
static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam))
return true;
if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle((void*)hWnd))
{
switch (msg)
{
case WM_CLOSE:
viewport->PlatformRequestClose = true;
return 0;
case WM_MOVE:
viewport->PlatformRequestMove = true;
break;
case WM_SIZE:
viewport->PlatformRequestResize = true;
break;
case WM_MOUSEACTIVATE:
if (viewport->Flags & ImGuiViewportFlags_NoFocusOnClick)
return MA_NOACTIVATE;
break;
case WM_NCHITTEST:
// Let mouse pass-through the window. This will allow the backend to set io.MouseHoveredViewport properly (which is OPTIONAL).
// The ImGuiViewportFlags_NoInputs flag is set while dragging a viewport, as want to detect the window behind the one we are dragging.
// If you cannot easily access those viewport flags from your windowing/event code: you may manually synchronize its state e.g. in
// your main loop after calling UpdatePlatformWindows(). Iterate all viewports/platform windows and pass the flag to your windowing system.
if (viewport->Flags & ImGuiViewportFlags_NoInputs)
return HTTRANSPARENT;
break;
}
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
static void ImGui_ImplWin32_InitPlatformInterface()
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = ImGui_ImplWin32_WndProcHandler_PlatformWindow;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = ::GetModuleHandle(NULL);
wcex.hIcon = NULL;
wcex.hCursor = NULL;
wcex.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = _T("ImGui Platform");
wcex.hIconSm = NULL;
::RegisterClassEx(&wcex);
ImGui_ImplWin32_UpdateMonitors();
// Register platform interface (will be coupled with a renderer interface)
ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
platform_io.Platform_CreateWindow = ImGui_ImplWin32_CreateWindow;
platform_io.Platform_DestroyWindow = ImGui_ImplWin32_DestroyWindow;
platform_io.Platform_ShowWindow = ImGui_ImplWin32_ShowWindow;
platform_io.Platform_SetWindowPos = ImGui_ImplWin32_SetWindowPos;
platform_io.Platform_GetWindowPos = ImGui_ImplWin32_GetWindowPos;
platform_io.Platform_SetWindowSize = ImGui_ImplWin32_SetWindowSize;
platform_io.Platform_GetWindowSize = ImGui_ImplWin32_GetWindowSize;
platform_io.Platform_SetWindowFocus = ImGui_ImplWin32_SetWindowFocus;
platform_io.Platform_GetWindowFocus = ImGui_ImplWin32_GetWindowFocus;
platform_io.Platform_GetWindowMinimized = ImGui_ImplWin32_GetWindowMinimized;
platform_io.Platform_SetWindowTitle = ImGui_ImplWin32_SetWindowTitle;
platform_io.Platform_SetWindowAlpha = ImGui_ImplWin32_SetWindowAlpha;
platform_io.Platform_UpdateWindow = ImGui_ImplWin32_UpdateWindow;
platform_io.Platform_GetWindowDpiScale = ImGui_ImplWin32_GetWindowDpiScale; // FIXME-DPI
platform_io.Platform_OnChangedViewport = ImGui_ImplWin32_OnChangedViewport; // FIXME-DPI
#if HAS_WIN32_IME
platform_io.Platform_SetImeInputPos = ImGui_ImplWin32_SetImeInputPos;
#endif
// Register main window handle (which is owned by the main application, not by us)
// This is mostly for simplicity and consistency, so that our code (e.g. mouse handling etc.) can use same logic for main and secondary viewports.
ImGuiViewport* main_viewport = ImGui::GetMainViewport();
ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
ImGui_ImplWin32_ViewportData* vd = IM_NEW(ImGui_ImplWin32_ViewportData)();
vd->Hwnd = bd->hWnd;
vd->HwndOwned = false;
main_viewport->PlatformUserData = vd;
main_viewport->PlatformHandle = (void*)bd->hWnd;
}
static void ImGui_ImplWin32_ShutdownPlatformInterface()
{
::UnregisterClass(_T("ImGui Platform"), ::GetModuleHandle(NULL));
ImGui::DestroyPlatformWindows();
}
//---------------------------------------------------------------------------------------------------------
// Transparency related helpers (optional)
//--------------------------------------------------------------------------------------------------------
#if defined(_MSC_VER)
#pragma comment(lib, "dwmapi") // Link with dwmapi.lib. MinGW will require linking with '-ldwmapi'
#endif
// [experimental]
// Borrowed from GLFW's function updateFramebufferTransparency() in src/win32_window.c
// (the Dwm* functions are Vista era functions but we are borrowing logic from GLFW)
void ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd)
{
if (!_IsWindowsVistaOrGreater())
return;
BOOL composition;
if (FAILED(::DwmIsCompositionEnabled(&composition)) || !composition)
return;
BOOL opaque;
DWORD color;
if (_IsWindows8OrGreater() || (SUCCEEDED(::DwmGetColorizationColor(&color, &opaque)) && !opaque))
{
HRGN region = ::CreateRectRgn(0, 0, -1, -1);
DWM_BLURBEHIND bb = {};
bb.dwFlags = DWM_BB_ENABLE | DWM_BB_BLURREGION;
bb.hRgnBlur = region;
bb.fEnable = TRUE;
::DwmEnableBlurBehindWindow((HWND)hwnd, &bb);
::DeleteObject(region);
}
else
{
DWM_BLURBEHIND bb = {};
bb.dwFlags = DWM_BB_ENABLE;
::DwmEnableBlurBehindWindow((HWND)hwnd, &bb);
}
}
//---------------------------------------------------------------------------------------------------------