Method DragScalar

tutorials/common/imgui/imgui_widgets.cpp:2315–2401

Note: p_data, p_min and p_max are _pointers_ to a memory address holding the data. For a Drag widget, p_min and p_max are optional. Read code of e.g. DragFloat(), DragInt() etc. or examples in 'Demo->Widgets->Data Types' to understand how to use this function directly.

// Note: p_data, p_min and p_max are _pointers_ to a memory address holding the data. For a Drag widget, p_min and p_max are optional.
// Read code of e.g. DragFloat(), DragInt() etc. or examples in 'Demo->Widgets->Data Types' to understand how to use this function directly.
bool ImGui::DragScalar(const char* label, ImGuiDataType data_type, void* p_data, float v_speed, const void* p_min, const void* p_max, const char* format, ImGuiSliderFlags flags)
{
    ImGuiWindow* window = GetCurrentWindow();
    if (window->SkipItems)
        return false;

    ImGuiContext& g = *GImGui;
    const ImGuiStyle& style = g.Style;
    const ImGuiID id = window->GetID(label);
    const float w = CalcItemWidth();

    const ImVec2 label_size = CalcTextSize(label, NULL, true);
    const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y * 2.0f));
    const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));

    const bool temp_input_allowed = (flags & ImGuiSliderFlags_NoInput) == 0;
    ItemSize(total_bb, style.FramePadding.y);
    if (!ItemAdd(total_bb, id, &frame_bb, temp_input_allowed ? ImGuiItemFlags_Inputable : 0))
        return false;

    // Default format string when passing NULL
    if (format == NULL)
        format = DataTypeGetInfo(data_type)->PrintFmt;

    const bool hovered = ItemHoverable(frame_bb, id);
    bool temp_input_is_active = temp_input_allowed && TempInputIsActive(id);
    if (!temp_input_is_active)
    {
        // Tabbing or CTRL-clicking on Drag turns it into an InputText
        const bool input_requested_by_tabbing = temp_input_allowed && (g.LastItemData.StatusFlags & ImGuiItemStatusFlags_FocusedByTabbing) != 0;
        const bool clicked = hovered && IsMouseClicked(0, id);
        const bool double_clicked = (hovered && g.IO.MouseClickedCount[0] == 2 && TestKeyOwner(ImGuiKey_MouseLeft, id));
        const bool make_active = (input_requested_by_tabbing || clicked || double_clicked || g.NavActivateId == id || g.NavActivateInputId == id);
        if (make_active && (clicked || double_clicked))
            SetKeyOwner(ImGuiKey_MouseLeft, id);
        if (make_active && temp_input_allowed)
            if (input_requested_by_tabbing || (clicked && g.IO.KeyCtrl) || double_clicked || g.NavActivateInputId == id)
                temp_input_is_active = true;

        // (Optional) simple click (without moving) turns Drag into an InputText
        if (g.IO.ConfigDragClickToInputText && temp_input_allowed && !temp_input_is_active)
            if (g.ActiveId == id && hovered && g.IO.MouseReleased[0] && !IsMouseDragPastThreshold(0, g.IO.MouseDragThreshold * DRAG_MOUSE_THRESHOLD_FACTOR))
            {
                g.NavActivateId = g.NavActivateInputId = id;
                g.NavActivateFlags = ImGuiActivateFlags_PreferInput;
                temp_input_is_active = true;
            }

        if (make_active && !temp_input_is_active)
        {
            SetActiveID(id, window);
            SetFocusID(id, window);
            FocusWindow(window);
            g.ActiveIdUsingNavDirMask = (1 << ImGuiDir_Left) | (1 << ImGuiDir_Right);
        }
    }

    if (temp_input_is_active)