Method UpdateKeyboardInputs

src/imgui/imgui.cpp:9915–9980

}

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

    if (io.ConfigFlags & ImGuiConfigFlags_NoKeyboard)
        io.ClearInputKeys();

    // Update aliases
    for (int n = 0; n < ImGuiMouseButton_COUNT; n++)
        UpdateAliasKey(MouseButtonToKey(n), io.MouseDown[n], io.MouseDown[n] ? 1.0f : 0.0f);
    UpdateAliasKey(ImGuiKey_MouseWheelX, io.MouseWheelH != 0.0f, io.MouseWheelH);
    UpdateAliasKey(ImGuiKey_MouseWheelY, io.MouseWheel != 0.0f, io.MouseWheel);

    // Synchronize io.KeyMods and io.KeyCtrl/io.KeyShift/etc. values.
    // - New backends (1.87+): send io.AddKeyEvent(ImGuiMod_XXX) ->                                      -> (here) deriving io.KeyMods + io.KeyXXX from key array.
    // - Legacy backends:      set io.KeyXXX bools               -> (above) set key array from io.KeyXXX -> (here) deriving io.KeyMods + io.KeyXXX from key array.
    // So with legacy backends the 4 values will do a unnecessary back-and-forth but it makes the code simpler and future facing.
    const ImGuiKeyChord prev_key_mods = io.KeyMods;
    io.KeyMods = GetMergedModsFromKeys();
    io.KeyCtrl = (io.KeyMods & ImGuiMod_Ctrl) != 0;
    io.KeyShift = (io.KeyMods & ImGuiMod_Shift) != 0;
    io.KeyAlt = (io.KeyMods & ImGuiMod_Alt) != 0;
    io.KeySuper = (io.KeyMods & ImGuiMod_Super) != 0;
    if (prev_key_mods != io.KeyMods)
        g.LastKeyModsChangeTime = g.Time;
    if (prev_key_mods != io.KeyMods && prev_key_mods == 0)
        g.LastKeyModsChangeFromNoneTime = g.Time;

    // Clear gamepad data if disabled
    if ((io.BackendFlags & ImGuiBackendFlags_HasGamepad) == 0)
        for (int key = ImGuiKey_Gamepad_BEGIN; key < ImGuiKey_Gamepad_END; key++)
        {
            io.KeysData[key - ImGuiKey_NamedKey_BEGIN].Down = false;
            io.KeysData[key - ImGuiKey_NamedKey_BEGIN].AnalogValue = 0.0f;
        }

    // Update keys
    for (int key = ImGuiKey_NamedKey_BEGIN; key < ImGuiKey_NamedKey_END; key++)
    {
        ImGuiKeyData* key_data = &io.KeysData[key - ImGuiKey_NamedKey_BEGIN];
        key_data->DownDurationPrev = key_data->DownDuration;
        key_data->DownDuration = key_data->Down ? (key_data->DownDuration < 0.0f ? 0.0f : key_data->DownDuration + io.DeltaTime) : -1.0f;
        if (key_data->DownDuration == 0.0f)
        {
            if (IsKeyboardKey((ImGuiKey)key))
                g.LastKeyboardKeyPressTime = g.Time;
            else if (key == ImGuiKey_ReservedForModCtrl || key == ImGuiKey_ReservedForModShift || key == ImGuiKey_ReservedForModAlt || key == ImGuiKey_ReservedForModSuper)
                g.LastKeyboardKeyPressTime = g.Time;
        }
    }

    // Update keys/input owner (named keys only): one entry per key
    for (ImGuiKey key = ImGuiKey_NamedKey_BEGIN; key < ImGuiKey_NamedKey_END; key = (ImGuiKey)(key + 1))
    {
        ImGuiKeyData* key_data = &io.KeysData[key - ImGuiKey_NamedKey_BEGIN];
        ImGuiKeyOwnerData* owner_data = &g.KeysOwnerData[key - ImGuiKey_NamedKey_BEGIN];
        owner_data->OwnerCurr = owner_data->OwnerNext;