/*
	Copyright (C) 2012 Johan Mattsson

	This library is free software; you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as
	published by the Free Software Foundation; either version 3 of the
	License, or (at your option) any later version.

	This library is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.
*/

using Cairo;
using Math;

namespace BirdFont {

public abstract class FontDisplay : GLib.Object {

	private static double last_tap_y = -1;
	private static double last_tap_time = 0;

	public static bool dirty_scrollbar = true;

	/** Queue redraw area */
	public signal void redraw_area (double x, double y, double w, double h);

	public virtual string get_name () {
		warning ("No name.");
		return "";
	}

	public virtual string get_label () {
		warning ("No label.");
		return "";
	}

	public virtual void close () {
	}

	public virtual bool has_scrollbar () {
		return false;
	}

	public virtual void update_scrollbar () {
	}

	public virtual void scroll_to (double percent) {
	}

	public virtual void draw (WidgetAllocation allocation, Context cr) {
	}

	public virtual void selected_canvas () {
	}

	public virtual void key_press (uint keyval) {
	}

	public virtual void key_release (uint keyval) {
	}

	public virtual void motion_notify (double x, double y) {
	}

	public virtual void button_release (int button, double x, double y) {
	}

	public virtual void button_press (uint button, double x, double y) {
	}

	public virtual void double_click (uint button, double ex, double ey) {
	}

  public virtual void magnify (double magnification) {
	}

	public virtual void tap_down (int finger, int x, int y) {
		if (finger == 0) {
			if ((GLib.get_real_time () - last_tap_time) / 1000000.0 < 0.4) {
				double_click (1, x, y);
			} else {
				button_press (1, x, y);
			}

			last_tap_time = GLib.get_real_time ();
		}

		last_tap_y = -1;
	}

	public virtual void tap_up (int finger, int x, int y) {
		if (finger == 0) {
			button_release (1, x, y);
		}

		last_tap_y = -1;
	}

	public virtual void tap_move (int finger, int x, int y) {
		double d;
		if (finger == 0) {
			motion_notify (x, y);

			d = y - last_tap_y;
			if (last_tap_y > -1 && fabs (d) > 15) { // FIXME: pixels, other units are better
				if (d > 0) {
					scroll_wheel (x, y, 15, 0);
				} else {
					scroll_wheel (x, y, 15, 0);
				}
			}

			last_tap_y = y;
		}
	}

	public virtual void zoom_in () {
	}

	public virtual void zoom_out () {
	}

	public virtual void zoom_max () {
	}

	public virtual void zoom_min () {
	}

	public virtual void move_view (double x, double y) {
	}

	public virtual void reset_zoom () {
	}

	public virtual void store_current_view () {
	}

	public virtual void restore_last_view () {
	}

	public virtual void next_view () {
	}

	public virtual void scroll_wheel (double x, double y,
		double pixeldelta_x,  double pixeldelta_y) {
	}

	public virtual void undo () {
	}

	public virtual void redo () {
	}

	public static File find_file (string? dir, string name) {
		return SearchPaths.find_file (dir, name);
	}

	/** returns false if bindings to a single key works in the display. */
	public virtual bool needs_modifier () {
		return false;
	}
}

}
