// Copyright (c) 2007, Rodrigo Braz Monteiro
// All rights reserved.
//
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//     this list of conditions and the following disclaimer.
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// Aegisub Project http://www.aegisub.org/
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// $Id$

/// @file visual_feature->h
/// @see visual_feature->cpp
/// @ingroup visual_ts
///

#pragma once

#include "vector2d.h"

class OpenGLWrapper;
class AssDialogue;

/// VisualDraggableFeature display types
enum DraggableFeatureType {
	DRAG_NONE,
	DRAG_BIG_SQUARE,
	DRAG_BIG_CIRCLE,
	DRAG_BIG_TRIANGLE,
	DRAG_SMALL_SQUARE,
	DRAG_SMALL_CIRCLE
};

/// @class VisualDraggableFeature
/// @brief Onscreen control used by many visual tools
///
/// By itself this class doesn't do much. It mostly just draws itself at a
/// specified position and performs hit-testing.
class VisualDraggableFeature {
	Vector2D start; ///< position before the last drag operation began

public:
	/// Constructor
	VisualDraggableFeature();

	DraggableFeatureType type; ///< Shape of feature
	Vector2D pos;              ///< Position of this feature
	int layer;                 ///< Layer; Higher = above
	AssDialogue* line;         ///< The dialogue line this feature is for; may be NULL

	/// @brief Is the given point over this feature?
	/// @param mouse_pos Position of the mouse
	bool IsMouseOver(Vector2D mouse_pos) const;

	/// @brief Draw this feature
	/// @param gl OpenGLWrapper to use
	void Draw(OpenGLWrapper const& gl) const;

	/// Start a drag
	void StartDrag();

	/// Update the position of the feature during a drag
	/// @param d New position of the feature
	/// @param single_axis Only apply the larger of the two changes to the position
	void UpdateDrag(Vector2D d, bool single_axis);

	/// Has this feature actually moved since a drag was last started?
	bool HasMoved() const;
};
