Method UpdateMouseInputs

extern/imgui/imgui.cpp:4462–4524

}

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

    // Round mouse position to avoid spreading non-rounded position (e.g. UpdateManualResize doesn't support them well)
    if (IsMousePosValid(&io.MousePos))
        io.MousePos = g.MouseLastValidPos = ImFloorSigned(io.MousePos);

    // If mouse just appeared or disappeared (usually denoted by -FLT_MAX components) we cancel out movement in MouseDelta
    if (IsMousePosValid(&io.MousePos) && IsMousePosValid(&io.MousePosPrev))
        io.MouseDelta = io.MousePos - io.MousePosPrev;
    else
        io.MouseDelta = ImVec2(0.0f, 0.0f);

    // If mouse moved we re-enable mouse hovering in case it was disabled by gamepad/keyboard. In theory should use a >0.0f threshold but would need to reset in everywhere we set this to true.
    if (io.MouseDelta.x != 0.0f || io.MouseDelta.y != 0.0f)
        g.NavDisableMouseHover = false;

    io.MousePosPrev = io.MousePos;
    for (int i = 0; i < IM_ARRAYSIZE(io.MouseDown); i++)
    {
        io.MouseClicked[i] = io.MouseDown[i] && io.MouseDownDuration[i] < 0.0f;
        io.MouseClickedCount[i] = 0; // Will be filled below
        io.MouseReleased[i] = !io.MouseDown[i] && io.MouseDownDuration[i] >= 0.0f;
        io.MouseDownDurationPrev[i] = io.MouseDownDuration[i];
        io.MouseDownDuration[i] = io.MouseDown[i] ? (io.MouseDownDuration[i] < 0.0f ? 0.0f : io.MouseDownDuration[i] + io.DeltaTime) : -1.0f;
        if (io.MouseClicked[i])
        {
            bool is_repeated_click = false;
            if ((float)(g.Time - io.MouseClickedTime[i]) < io.MouseDoubleClickTime)
            {
                ImVec2 delta_from_click_pos = IsMousePosValid(&io.MousePos) ? (io.MousePos - io.MouseClickedPos[i]) : ImVec2(0.0f, 0.0f);
                if (ImLengthSqr(delta_from_click_pos) < io.MouseDoubleClickMaxDist * io.MouseDoubleClickMaxDist)
                    is_repeated_click = true;
            }
            if (is_repeated_click)
                io.MouseClickedLastCount[i]++;
            else
                io.MouseClickedLastCount[i] = 1;
            io.MouseClickedTime[i] = g.Time;
            io.MouseClickedPos[i] = io.MousePos;
            io.MouseClickedCount[i] = io.MouseClickedLastCount[i];
            io.MouseDragMaxDistanceAbs[i] = ImVec2(0.0f, 0.0f);
            io.MouseDragMaxDistanceSqr[i] = 0.0f;
        }
        else if (io.MouseDown[i])
        {
            // Maintain the maximum distance we reaching from the initial click position, which is used with dragging threshold
            ImVec2 delta_from_click_pos = IsMousePosValid(&io.MousePos) ? (io.MousePos - io.MouseClickedPos[i]) : ImVec2(0.0f, 0.0f);
            io.MouseDragMaxDistanceSqr[i] = ImMax(io.MouseDragMaxDistanceSqr[i], ImLengthSqr(delta_from_click_pos));
            io.MouseDragMaxDistanceAbs[i].x = ImMax(io.MouseDragMaxDistanceAbs[i].x, delta_from_click_pos.x < 0.0f ? -delta_from_click_pos.x : delta_from_click_pos.x);
            io.MouseDragMaxDistanceAbs[i].y = ImMax(io.MouseDragMaxDistanceAbs[i].y, delta_from_click_pos.y < 0.0f ? -delta_from_click_pos.y : delta_from_click_pos.y);
        }

        // We provide io.MouseDoubleClicked[] as a legacy service
        io.MouseDoubleClicked[i] = (io.MouseClickedCount[i] == 2);