Function create_tool_loop

src/app/ui/editor/tool_loop_impl.cpp:480–556

};

tools::ToolLoop* create_tool_loop(Editor* editor, Context* context)
{
  tools::Tool* current_tool = editor->getCurrentEditorTool();
  std::shared_ptr<tools::Ink> current_ink = editor->getCurrentEditorInk();
  if (!current_tool || !current_ink)
    return nullptr;

  Layer* layer;

  // For selection tools, we can use any layer (even without layers at
  // all), so we specify a nullptr here as the active layer. This is
  // used as a special case by the render::Render class to show the
  // preview image/selection stroke as a xor'd overlay in the render
  // result.
  //
  // Anyway this cannot be used in 'magic wand' tool (isSelection +
  // isFloodFill) because we need the original layer source
  // image/pixels to stop the flood-fill algorithm.
  if (current_ink->isSelection() &&
      !current_tool->getPointShape(editor->isSecondaryButton() ? 1: 0)->isFloodFill()) {
    layer = nullptr;
  }
  else {
    layer = editor->layer();
    if (!layer) {
      StatusBar::instance()->showTip(
        1000, "There is no active layer");
      return nullptr;
    }
    else if (!layer->isVisible()) {
      StatusBar::instance()->showTip(
        1000, "Layer '%s' is hidden", layer->name().c_str());
      return nullptr;
    }
    // If the active layer is read-only.
    else if (!layer->isEditable()) {
      StatusBar::instance()->showTip(
        1000, "Layer '%s' is locked", layer->name().c_str());
      return nullptr;
    }
  }

  // Get fg/bg colors
  ColorBar* colorbar = ColorBar::instance();
  app::Color fg = colorbar->getFgColor();
  app::Color bg = colorbar->getBgColor();

  ASSERT(fg.isValid());
  ASSERT(bg.isValid());

  if (!fg.isValid() || !bg.isValid()) {
    Alert::show(PACKAGE
                "<<The current selected foreground and/or background color"
                "<<is out of range. Select a valid color in the color-bar."
                "||&Close");
    return NULL;
  }