Method EndFrame

include/imgui/imgui.cpp:6001–6101

This is normally called by Render(). You may want to call it directly if you want to avoid calling Render() but the gain will be very minimal.

// This is normally called by Render(). You may want to call it directly if you want to avoid calling Render() but the gain will be very minimal.
void ImGui::EndFrame()
{
    ImGuiContext& g = *GImGui;
    IM_ASSERT(g.Initialized);

    // Don't process EndFrame() multiple times.
    if (g.FrameCountEnded == g.FrameCount)
        return;
    IM_ASSERT_USER_ERROR_RET(g.WithinFrameScope, "Forgot to call ImGui::NewFrame()?");

    CallContextHooks(&g, ImGuiContextHookType_EndFramePre);

    // [EXPERIMENTAL] Recover from errors
    if (g.IO.ConfigErrorRecovery)
        ErrorRecoveryTryToRecoverState(&g.StackSizesInNewFrame);
    ErrorCheckEndFrameSanityChecks();
    ErrorCheckEndFrameFinalizeErrorTooltip();

    // Notify Platform/OS when our Input Method Editor cursor has moved (e.g. CJK inputs using Microsoft IME)
    ImGuiPlatformImeData* ime_data = &g.PlatformImeData;
    if (g.PlatformIO.Platform_SetImeDataFn != NULL && memcmp(ime_data, &g.PlatformImeDataPrev, sizeof(ImGuiPlatformImeData)) != 0)
    {
        IM_ASSERT(ime_data->ViewportId == IMGUI_VIEWPORT_DEFAULT_ID); // master branch
        ImGuiViewport* viewport = GetMainViewport();
        IMGUI_DEBUG_LOG_IO("[io] Calling Platform_SetImeDataFn(): WantVisible: %d, InputPos (%.2f,%.2f) for Viewport 0x%08X\n", ime_data->WantVisible, ime_data->InputPos.x, ime_data->InputPos.y, viewport->ID);
        g.PlatformIO.Platform_SetImeDataFn(&g, viewport, ime_data);
    }
    g.WantTextInputNextFrame = ime_data->WantTextInput ? 1 : 0;

    // Hide and unfocus implicit/fallback "Debug" window if it hasn't been used
    g.WithinFrameScopeWithImplicitWindow = false;
    if (g.CurrentWindow && g.CurrentWindow->IsFallbackWindow && g.CurrentWindow->WriteAccessed == false)
    {
        g.CurrentWindow->Active = false;
        if (g.NavWindow && g.NavWindow->RootWindow == g.CurrentWindow)
            FocusWindow(NULL);
    }
    End();

    // Update navigation: Ctrl+Tab, wrap-around requests
    NavEndFrame();

    // Drag and Drop: Elapse payload (if delivered, or if source stops being submitted)
    if (g.DragDropActive)
    {
        bool is_delivered = g.DragDropPayload.Delivery;
        bool is_elapsed = (g.DragDropSourceFrameCount + 1 < g.FrameCount) && ((g.DragDropSourceFlags & ImGuiDragDropFlags_PayloadAutoExpire) || g.DragDropMouseButton == -1 || !IsMouseDown(g.DragDropMouseButton));
        if (is_delivered || is_elapsed)
            ClearDragDrop();
    }

    // Drag and Drop: Fallback for missing source tooltip. This is not ideal but better than nothing.
    // If you want to handle source item disappearing: instead of submitting your description tooltip
    // in the BeginDragDropSource() block of the dragged item, you can submit them from a safe single spot
    // (e.g. end of your item loop, or before EndFrame) by reading payload data.
    // In the typical case, the contents of drag tooltip should be possible to infer solely from payload data.
    if (g.DragDropActive && g.DragDropSourceFrameCount + 1 < g.FrameCount && !(g.DragDropSourceFlags & ImGuiDragDropFlags_SourceNoPreviewTooltip))
    {