xournalpp/src/gui/PageViewFindObjectHelper.h

/*
 * Xournal++
 *
 * Helper classes to find / select objects
 *
 * @author Xournal++ Team
 * https://github.com/xournalpp/xournalpp
 *
 * @license GNU GPLv2 or later
 */

#pragma once

// No include needed, this is included after PageView.h

#include <util/audio/AudioPlayer.h>

class BaseSelectObject
{
public:
	BaseSelectObject(XojPageView* view)
 	 : view(view),
	   x(0),
	   y(0)
	{
	}

	virtual ~BaseSelectObject()
	{
	}

public:
	virtual void at(double x, double y)
	{
		this->x = x;
		this->y = y;

		// clear old selection anyway
		view->xournal->getControl()->clearSelection();
		matchRect = { gint(x - 10), gint(y - 10), 20, 20 };

		for (Layer* l : *view->page->getLayers())
		{
			if (view->page->isLayerVisible(l))
			{
				checkLayer(l);
			}
		}
	}

protected:
	void checkLayer(Layer* l)
	{
		for (Element* e : *l->getElements())
		{
			if (e->intersectsArea(&matchRect))
			{
				checkElement(e);
			}
		}
	}

	virtual void checkElement(Element* e) = 0;

protected:
	GdkRectangle matchRect;
	XojPageView* view;
	double x;
	double y;
};

class SelectObject : public BaseSelectObject
{
public:
	SelectObject(XojPageView* view)
 	 : BaseSelectObject(view),
	   strokeMatch(NULL),
	   elementMatch(NULL),
	   gap(1000000000)
	{
	}

	virtual ~SelectObject()
	{
	}

	void at(double x, double y)
	{
		BaseSelectObject::at(x, y);

		if (strokeMatch)
		{
			elementMatch = strokeMatch;
		}

		if (elementMatch)
		{
			view->xournal->setSelection(new EditSelection(view->xournal->getControl()->getUndoRedoHandler(), elementMatch, view, view->page));

			view->repaintPage();
		}
	}

protected:
	virtual void checkElement(Element* e)
	{
		if (e->getType() == ELEMENT_STROKE)
		{
			Stroke* s = (Stroke*) e;
			double tmpGap = 0;
			if ((s->intersects(x, y, 5, &tmpGap)) && (gap > tmpGap))
			{
				gap = tmpGap;
				strokeMatch = s;
			}
		}
		else
		{
			elementMatch = e;
		}
	}

private:
	Stroke* strokeMatch;
	Element* elementMatch;
	double gap;
};

class PlayObject : public BaseSelectObject
{
public:
	PlayObject(XojPageView* view)
 	 : BaseSelectObject(view)
	{
	}

	virtual ~PlayObject()
	{
	}

public:
	void at(double x, double y)
	{
		BaseSelectObject::at(x, y);
	}

protected:
	virtual void checkElement(Element* e)
	{
		if (e->getType() != ELEMENT_STROKE && e->getType() != ELEMENT_TEXT)
		{
			return;
		}

		AudioElement* s = (AudioElement*) e;
		double tmpGap = 0;
		if ((s->intersects(x, y, 15, &tmpGap)))
		{
			size_t ts = s->getTimestamp();

			string fn = s->getAudioFilename();

			if (!fn.empty())
			{
				AudioPlayer* audioPlayer = view->getXournal()->getControl()->getAudioController()->getAudioPlayer();
				audioPlayer->abort();
				audioPlayer->start(Path::fromUri(view->settings->getAudioFolder()).str() + "/" + fn, (unsigned int) ts);
			}
		}
	}
};