Method UpdateInputEvents

src/third-party/imgui/imgui.cpp:7781–7898

Process input queue - 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)

// - 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;

    bool mouse_moved = false, mouse_wheeled = false, key_changed = false, text_inputed = 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++)
    {
        const ImGuiInputEvent* e = &g.InputEventsQueue[event_n];
        if (e->Type == ImGuiInputEventType_MousePos)
        {
            ImVec2 event_pos(e->MousePos.PosX, e->MousePos.PosY);
            if (IsMousePosValid(&event_pos))
                event_pos = ImVec2(ImFloorSigned(event_pos.x), ImFloorSigned(event_pos.y)); // Apply same flooring as UpdateMouseInputs()
            if (io.MousePos.x != event_pos.x || io.MousePos.y != event_pos.y)
            {
                // Trickling Rule: Stop processing queued events if we already handled a mouse button change
                if (trickle_fast_inputs && (mouse_button_changed != 0 || mouse_wheeled || key_changed || text_inputed))
                    break;
                io.MousePos = event_pos;
                mouse_moved = true;
            }
        }
        else if (e->Type == ImGuiInputEventType_MouseButton)
        {
            const ImGuiMouseButton button = e->MouseButton.Button;
            IM_ASSERT(button >= 0 && button < ImGuiMouseButton_COUNT);
            if (io.MouseDown[button] != e->MouseButton.Down)
            {
                // Trickling Rule: Stop processing queued events if we got multiple action on the same button
                if (trickle_fast_inputs && ((mouse_button_changed & (1 << button)) || mouse_wheeled))
                    break;
                io.MouseDown[button] = e->MouseButton.Down;
                mouse_button_changed |= (1 << button);
            }
        }
        else if (e->Type == ImGuiInputEventType_MouseWheel)
        {
            if (e->MouseWheel.WheelX != 0.0f || e->MouseWheel.WheelY != 0.0f)
            {
                // Trickling Rule: Stop processing queued events if we got multiple action on the event
                if (trickle_fast_inputs && (mouse_wheeled || mouse_button_changed != 0))
                    break;
                io.MouseWheelH += e->MouseWheel.WheelX;
                io.MouseWheel += e->MouseWheel.WheelY;
                mouse_wheeled = true;
            }
        }
        else if (e->Type == ImGuiInputEventType_Key)
        {
            ImGuiKey key = e->Key.Key;
            IM_ASSERT(key != ImGuiKey_None);
            const int keydata_index = (key - ImGuiKey_KeysData_OFFSET);
            ImGuiKeyData* keydata = &io.KeysData[keydata_index];