Method NavUpdate

core/src/imgui/imgui.cpp:9021–9300

}

static void ImGui::NavUpdate()
{
    ImGuiContext& g = *GImGui;
    ImGuiIO& io = g.IO;

    io.WantSetMousePos = false;
    g.NavWrapRequestWindow = NULL;
    g.NavWrapRequestFlags = ImGuiNavMoveFlags_None;
#if 0
    if (g.NavScoringCount > 0) IMGUI_DEBUG_LOG("NavScoringCount %d for '%s' layer %d (Init:%d, Move:%d)\n", g.FrameCount, g.NavScoringCount, g.NavWindow ? g.NavWindow->Name : "NULL", g.NavLayer, g.NavInitRequest || g.NavInitResultId != 0, g.NavMoveRequest);
#endif

    // Set input source as Gamepad when buttons are pressed (as some features differs when used with Gamepad vs Keyboard)
    // (do it before we map Keyboard input!)
    bool nav_keyboard_active = (io.ConfigFlags & ImGuiConfigFlags_NavEnableKeyboard) != 0;
    bool nav_gamepad_active = (io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) != 0 && (io.BackendFlags & ImGuiBackendFlags_HasGamepad) != 0;
    if (nav_gamepad_active && g.NavInputSource != ImGuiInputSource_Gamepad)
    {
        if (io.NavInputs[ImGuiNavInput_Activate] > 0.0f || io.NavInputs[ImGuiNavInput_Input] > 0.0f || io.NavInputs[ImGuiNavInput_Cancel] > 0.0f || io.NavInputs[ImGuiNavInput_Menu] > 0.0f
            || io.NavInputs[ImGuiNavInput_DpadLeft] > 0.0f || io.NavInputs[ImGuiNavInput_DpadRight] > 0.0f || io.NavInputs[ImGuiNavInput_DpadUp] > 0.0f || io.NavInputs[ImGuiNavInput_DpadDown] > 0.0f)
            g.NavInputSource = ImGuiInputSource_Gamepad;
    }

    // Update Keyboard->Nav inputs mapping
    if (nav_keyboard_active)
    {
        #define NAV_MAP_KEY(_KEY, _NAV_INPUT)  do { if (IsKeyDown(io.KeyMap[_KEY])) { io.NavInputs[_NAV_INPUT] = 1.0f; g.NavInputSource = ImGuiInputSource_Keyboard; } } while (0)
        NAV_MAP_KEY(ImGuiKey_Space,     ImGuiNavInput_Activate );
        NAV_MAP_KEY(ImGuiKey_Enter,     ImGuiNavInput_Input    );
        NAV_MAP_KEY(ImGuiKey_Escape,    ImGuiNavInput_Cancel   );
        NAV_MAP_KEY(ImGuiKey_LeftArrow, ImGuiNavInput_KeyLeft_ );
        NAV_MAP_KEY(ImGuiKey_RightArrow,ImGuiNavInput_KeyRight_);
        NAV_MAP_KEY(ImGuiKey_UpArrow,   ImGuiNavInput_KeyUp_   );
        NAV_MAP_KEY(ImGuiKey_DownArrow, ImGuiNavInput_KeyDown_ );
        if (io.KeyCtrl)
            io.NavInputs[ImGuiNavInput_TweakSlow] = 1.0f;
        if (io.KeyShift)
            io.NavInputs[ImGuiNavInput_TweakFast] = 1.0f;

        // AltGR is normally Alt+Ctrl but we can't reliably detect it (not all backends/systems/layout emit it as Alt+Ctrl)
        // But also even on keyboards without AltGR we don't want Alt+Ctrl to open menu anyway.
        if (io.KeyAlt && !io.KeyCtrl)
            io.NavInputs[ImGuiNavInput_KeyMenu_]  = 1.0f;

        // We automatically cancel toggling nav layer when any text has been typed while holding Alt. (See #370)
        if (io.KeyAlt && !io.KeyCtrl && g.NavWindowingToggleLayer && io.InputQueueCharacters.Size > 0)
            g.NavWindowingToggleLayer = false;

        #undef NAV_MAP_KEY
    }
    memcpy(io.NavInputsDownDurationPrev, io.NavInputsDownDuration, sizeof(io.NavInputsDownDuration));
    for (int i = 0; i < IM_ARRAYSIZE(io.NavInputs); i++)
        io.NavInputsDownDuration[i] = (io.NavInputs[i] > 0.0f) ? (io.NavInputsDownDuration[i] < 0.0f ? 0.0f : io.NavInputsDownDuration[i] + io.DeltaTime) : -1.0f;

    // Process navigation init request (select first/default focus)
    if (g.NavInitResultId != 0)
        NavUpdateInitResult();
    g.NavInitRequest = false;