Method UpdateInputEvents

src/external/imgui/imgui.cpp:9038–9159

Process input queue We always call this with the value of 'bool g.IO.ConfigInputTrickleEventQueue'. - trickle_fast_inputs = false : process all events, turn into flattened input state (e.g. successive down/up/down/up will be lost) - trickle_fast_inputs = true : process as many events as possible (successive down/up/down/up will be trickled over several frames so nothing is lost) (new feature in 1

// - trickle_fast_inputs = false : process all events, turn into flattened input state (e.g. successive down/up/down/up will be lost)
// - trickle_fast_inputs = true  : process as many events as possible (successive down/up/down/up will be trickled over several frames so nothing is lost) (new feature in 1.87)
void ImGui::UpdateInputEvents(bool trickle_fast_inputs)
{
    ImGuiContext& g = *GImGui;
    ImGuiIO& io = g.IO;

    // Only trickle chars<>key when working with InputText()
    // FIXME: InputText() could parse event trail?
    // FIXME: Could specialize chars<>keys trickling rules for control keys (those not typically associated to characters)
    const bool trickle_interleaved_keys_and_text = (trickle_fast_inputs && g.WantTextInputNextFrame == 1);

    bool mouse_moved = false, mouse_wheeled = false, key_changed = false, text_inputted = false;
    int  mouse_button_changed = 0x00;
    ImBitArray<ImGuiKey_KeysData_SIZE> key_changed_mask;

    int event_n = 0;
    for (; event_n < g.InputEventsQueue.Size; event_n++)
    {
        ImGuiInputEvent* e = &g.InputEventsQueue[event_n];
        if (e->Type == ImGuiInputEventType_MousePos)
        {
            if (g.IO.WantSetMousePos)
                continue;
            // Trickling Rule: Stop processing queued events if we already handled a mouse button change
            ImVec2 event_pos(e->MousePos.PosX, e->MousePos.PosY);
            if (trickle_fast_inputs && (mouse_button_changed != 0 || mouse_wheeled || key_changed || text_inputted))
                break;
            io.MousePos = event_pos;
            io.MouseSource = e->MousePos.MouseSource;
            mouse_moved = true;
        }
        else if (e->Type == ImGuiInputEventType_MouseButton)
        {
            // Trickling Rule: Stop processing queued events if we got multiple action on the same button
            const ImGuiMouseButton button = e->MouseButton.Button;
            IM_ASSERT(button >= 0 && button < ImGuiMouseButton_COUNT);
            if (trickle_fast_inputs && ((mouse_button_changed & (1 << button)) || mouse_wheeled))
                break;
            if (trickle_fast_inputs && e->MouseButton.MouseSource == ImGuiMouseSource_TouchScreen && mouse_moved) // #2702: TouchScreen have no initial hover.
                break;
            io.MouseDown[button] = e->MouseButton.Down;
            io.MouseSource = e->MouseButton.MouseSource;
            mouse_button_changed |= (1 << button);
        }
        else if (e->Type == ImGuiInputEventType_MouseWheel)
        {
            // Trickling Rule: Stop processing queued events if we got multiple action on the event
            if (trickle_fast_inputs && (mouse_moved || mouse_button_changed != 0))
                break;
            io.MouseWheelH += e->MouseWheel.WheelX;
            io.MouseWheel += e->MouseWheel.WheelY;
            io.MouseSource = e->MouseWheel.MouseSource;
            mouse_wheeled = true;
        }
        else if (e->Type == ImGuiInputEventType_Key)
        {
            // Trickling Rule: Stop processing queued events if we got multiple action on the same button
            ImGuiKey key = e->Key.Key;
            IM_ASSERT(key != ImGuiKey_None);