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/*
Copyright (C) 2011-2013 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file canvas/canvas.h
* @brief Declaration of the main canvas classes.
*/
#ifndef __CANVAS_CANVAS_H__
#define __CANVAS_CANVAS_H__
#include <set>
#include <gdkmm/window.h>
#include <gtkmm/eventbox.h>
#include <gtkmm/alignment.h>
#include <cairomm/surface.h>
#include <cairomm/context.h>
#include "pbd/signals.h"
#include "canvas/visibility.h"
#include "canvas/root_group.h"
namespace ArdourCanvas
{
class Rect;
class Item;
class ScrollGroup;
/** The base class for our different types of canvas.
*
* A canvas is an area which holds a collection of canvas items, which in
* turn represent shapes, text, etc.
*
* The canvas has an arbitrarily large area, and is addressed in coordinates
* of screen pixels, with an origin of (0, 0) at the top left. x increases
* rightwards and y increases downwards.
*/
class LIBCANVAS_API Canvas
{
public:
Canvas ();
virtual ~Canvas () {}
/** called to request a redraw of an area of the canvas in WINDOW coordinates */
virtual void request_redraw (Rect const &) = 0;
/** called to ask the canvas to request a particular size from its host */
virtual void request_size (Duple) = 0;
/** called to ask the canvas' host to `grab' an item */
virtual void grab (Item *) = 0;
/** called to ask the canvas' host to `ungrab' any grabbed item */
virtual void ungrab () = 0;
/** called to ask the canvas' host to keyboard focus on an item */
virtual void focus (Item *) = 0;
/** called to ask the canvas' host to drop keyboard focus on an item */
virtual void unfocus (Item*) = 0;
void render (Rect const &, Cairo::RefPtr<Cairo::Context> const &) const;
/** @return root group */
Item* root () {
return &_root;
}
/** Called when an item is being destroyed */
virtual void item_going_away (Item *, boost::optional<Rect>) {}
void item_shown_or_hidden (Item *);
void item_visual_property_changed (Item*);
void item_changed (Item *, boost::optional<Rect>);
void item_moved (Item *, boost::optional<Rect>);
virtual Cairo::RefPtr<Cairo::Context> context () = 0;
Duple canvas_to_window (Duple const&, bool rounded = true) const;
Duple window_to_canvas (Duple const&) const;
void canvas_to_window (Coord cx, Coord cy, Coord& wx, Coord& wy) {
Duple d = canvas_to_window (Duple (cx, cy));
wx = d.x;
wy = d.y;
}
void window_to_canvas (Coord wx, Coord wy, Coord& cx, Coord& cy) {
Duple d = window_to_canvas (Duple (wx, wy));
cx = d.x;
cy = d.y;
}
void scroll_to (Coord x, Coord y);
void add_scroller (ScrollGroup& i);
virtual Rect visible_area () const = 0;
virtual Coord width () const = 0;
virtual Coord height () const = 0;
void zoomed();
std::string indent() const;
std::string render_indent() const;
void dump (std::ostream&) const;
protected:
void queue_draw_item_area (Item *, Rect);
/** our root item */
Root _root;
virtual void pick_current_item (int state) = 0;
virtual void pick_current_item (Duple const &, int state) = 0;
std::list<ScrollGroup*> scrollers;
};
/** A canvas which renders onto a GTK EventBox */
class LIBCANVAS_API GtkCanvas : public Canvas, public Gtk::EventBox
{
public:
GtkCanvas ();
void request_redraw (Rect const &);
void request_size (Duple);
void grab (Item *);
void ungrab ();
void focus (Item *);
void unfocus (Item*);
Cairo::RefPtr<Cairo::Context> context ();
Rect visible_area () const;
Coord width() const;
Coord height() const;
protected:
bool on_expose_event (GdkEventExpose *);
bool on_button_press_event (GdkEventButton *);
bool on_button_release_event (GdkEventButton* event);
bool on_motion_notify_event (GdkEventMotion *);
bool on_enter_notify_event (GdkEventCrossing*);
bool on_leave_notify_event (GdkEventCrossing*);
bool button_handler (GdkEventButton *);
bool motion_notify_handler (GdkEventMotion *);
bool deliver_event (GdkEvent *);
void deliver_enter_leave (Duple const & point, int state);
void pick_current_item (int state);
void pick_current_item (Duple const &, int state);
private:
void item_going_away (Item *, boost::optional<Rect>);
bool send_leave_event (Item const *, double, double) const;
/** Item currently chosen for event delivery based on pointer position */
Item * _current_item;
/** Item pending as _current_item */
Item * _new_current_item;
/** the item that is currently grabbed, or 0 */
Item * _grabbed_item;
/** the item that currently has key focus or 0 */
Item * _focused_item;
};
/** A GTK::Alignment with a GtkCanvas inside it plus some Gtk::Adjustments for
* scrolling.
*
* This provides a GtkCanvas that can be scrolled. It does NOT implement the
* Gtk::Scrollable interface.
*/
class LIBCANVAS_API GtkCanvasViewport : public Gtk::Alignment
{
public:
GtkCanvasViewport (Gtk::Adjustment &, Gtk::Adjustment &);
/** @return our GtkCanvas */
GtkCanvas* canvas () {
return &_canvas;
}
protected:
void on_size_request (Gtk::Requisition *);
private:
/** our GtkCanvas */
GtkCanvas _canvas;
Gtk::Adjustment& hadjustment;
Gtk::Adjustment& vadjustment;
void scrolled ();
};
}
std::ostream& operator<< (std::ostream&, const ArdourCanvas::Canvas&);
#endif
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