measure.hh

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/*
 * Scroom - Generic viewer for 2D data
 * Copyright (C) 2009-2026 Kees-Jan Dijkzeul
 *
 * SPDX-License-Identifier: LGPL-2.1
 */
 
#pragma once
 
#include <optional>
 
#include <scroom/plugininformationinterface.hh>
#include <scroom/point.hh>
#include <scroom/utilities.hh>
#include <scroom/viewinterface.hh>
 
class MeasureHandler
  : public ToolStateListener
  , public PostRenderer
  , public SelectionListener
  , virtual public Scroom::Utils::Base
{
public:
  using Ptr = std::shared_ptr<MeasureHandler>;
 
private:
  std::optional<Selection> selection;
  bool enabled{false};
 
public:
  static Ptr create();
 
  // PostRenderer
 
  void render(ViewInterface::Ptr const& vi, cairo_t* cr, Scroom::Utils::Rectangle<double> presentationArea, int zoom) override;
 
  // SelectionListener
 
  void onSelectionStart(Selection p, ViewInterface::Ptr view) override;
  void onSelectionUpdate(Selection s, ViewInterface::Ptr view) override;
  void onSelectionEnd(Selection s, ViewInterface::Ptr view) override;
 
  // ToolStateListener
 
  void onEnable() override;
  void onDisable() override;
 
 
private:
  virtual void displayMeasurement(const ViewInterface::Ptr& view);
  virtual void drawCross(cairo_t* cr, Scroom::Utils::Point<double> p);
};
 
class Measure
  : public PluginInformationInterface
  , public ViewObserver
  , virtual public Scroom::Utils::Base
{
public:
  using Ptr = std::shared_ptr<Measure>;
 
private:
  Measure() = default;
 
public:
  static Ptr create();
 
public:
  // PluginInformationInterface
 
  std::string getPluginName() override;
  std::string getPluginVersion() override;
  void registerCapabilities(ScroomPluginInterface::Ptr host) override;
 
  // ViewObserver
 
  Scroom::Bookkeeping::Token viewAdded(ViewInterface::Ptr v) override;
 
};