#include "activearea.h"

ActiveArea::ActiveArea() {

	add_events( Gdk::BUTTON_PRESS_MASK

	          | Gdk::BUTTON_RELEASE_MASK

			  | Gdk::POINTER_MOTION_MASK );

}

bool ActiveArea::is_point_added(const ActivePoint::Handle &point) const {

	for(PointList::const_iterator i = points.begin(); i != points.end(); ++i)

		if (*i == point) return true;

	return false;

}

void ActiveArea::add_point(const ActivePoint::Handle &point) {

	if (point && !is_point_added(point)) {

		points.push_back(point);

		queue_draw();

	}

}

void ActiveArea::remove_point(const ActivePoint::Handle &point) {

	ActivePoint::Handle p = point;

	for(PointList::iterator i = points.begin(); i != points.end();)

		if (*i == p) { i = points.erase(i); queue_draw(); } else ++i;

	if (drag_point == p)

		hover_point.reset();

	if (hover_point == p)

		{ hover_point->active = false; hover_point.reset(); }

}

void ActiveArea::bring_to_front(const ActivePoint::Handle &point) {

	ActivePoint::Handle p = point;

	for(PointList::iterator i = points.begin(); i != points.end(); ++i)

		if (*i == p)

			{ i = points.erase(i); points.push_back(p); break; }

}

ActivePoint::Handle ActiveArea::get_point_at(const Vector &position) const {

	for(PointList::const_reverse_iterator ri = points.rbegin(); ri != points.rend(); ++ri)

		if ((*ri)->enabled && (*ri)->visible && (*ri)->is_inside(position))

			return *ri;

	return nohandle;

}

bool ActiveArea::on_button_press_event(GdkEventButton* event) {

	if (event->button == 1) {

		Vector position(event->x, event->y);

		ActivePoint::Handle old_point = drag_point;

		drag_point = get_point_at(position);

		if (drag_point) {

			if (hover_point) hover_point->active = false;

			hover_point = drag_point;

			hover_point->active = true;

			bring_to_front(drag_point);

			drag_offset = drag_point->position - position;

		}

		if (old_point != drag_point) queue_draw();

		return true;

	}

	return false;

}

bool ActiveArea::on_button_release_event(GdkEventButton* event) {

	if (event->button == 1) {

		if (drag_point) {

			drag_point.reset();

			if (hover_point) hover_point->active = false;

			hover_point = get_point_at(Vector(event->x, event->y));

			if (hover_point) hover_point->active = true;

			queue_draw();

		}

		return true;

	}

	return false;

}

bool ActiveArea::on_motion_notify_event(GdkEventMotion* event) {

	Vector position(event->x, event->y);

	if (drag_point) {

		Vector oldposition = drag_point->position;

		Vector newposition = position + drag_offset;

		if (newposition != oldposition) {

			drag_point->position = newposition;

			on_point_move(drag_point, oldposition);

			queue_draw();

		}

	} else {

		ActivePoint::Handle old_point = hover_point;

		if (hover_point) hover_point->active = false;

		hover_point = get_point_at(position);

		if (hover_point) hover_point->active = true;

		if (old_point != hover_point) queue_draw();

	}

	return true;

}

bool ActiveArea::on_draw(const Cairo::RefPtr<cairo::context> &context) {</cairo::context>

	on_draw(Context(context));

	return true;

}

void ActiveArea::on_draw(const Context &context) {

	// fill background

	context->save();

	context->rectangle(0, 0, get_width(), get_height());

	context->set_source_rgba(1, 1, 1, 1);

	context->fill();

	context->restore();

	on_draw_content(context);

	// draw points

	for(PointList::const_iterator i = points.begin(); i != points.end(); ++i)

		context.point(**i);

}

void ActiveArea::on_point_move(const ActivePoint::Handle &/*point*/, const Vector &/*oldposition*/)

	{ }

void ActiveArea::on_draw_content(const Context &/*context*/)

	{ }