canvas/canvas/canvas.h

Go to the documentation of this file.

/*
 * Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2013-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2014-2015 Ben Loftis <ben@harrisonconsoles.com>
 * Copyright (C) 2014-2017 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2017 Tim Mayberry <mojofunk@gmail.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __CANVAS_CANVAS_H__
#define __CANVAS_CANVAS_H__
 
#include <set>
 
#include <gtkmm/alignment.h>
#include <gtkmm/eventbox.h>
#include <gdkmm/window.h>
 
#include <cairomm/context.h>
#include <cairomm/surface.h>
 
#include "pbd/signals.h"
 
#include "gtkmm2ext/cairo_canvas.h"
 
#include "canvas/root_group.h"
#include "canvas/visibility.h"
 
namespace Gtk {
        class Window;
        class Label;
}
 
namespace Pango {
        class Context;
}
 
namespace ArdourCanvas
{
struct Rect;
 
class Item;
class ScrollGroup;
 
class LIBCANVAS_API Canvas
{
public:
        Canvas ();
        virtual ~Canvas () {}
 
        virtual void request_redraw (Rect const &) = 0;
        virtual void request_size (Duple) = 0;
        virtual void grab (Item *) = 0;
        virtual void ungrab () = 0;
        virtual void queue_resize () = 0;
 
        virtual void focus (Item *) = 0;
        virtual void unfocus (Item*) = 0;
 
        virtual bool have_grab() const { return false; }
        virtual bool grab_can_translate () const { return true; }
 
        void render (Rect const &, Cairo::RefPtr<Cairo::Context> const &) const;
 
        void prepare_for_render (Rect const &) const;
 
        gint64 get_last_render_start_timestamp () const { return _last_render_start_timestamp; }
 
        gint64 get_microseconds_since_render_start () const;
 
        Item* root () {
                return &_root;
        }
 
        void freeze_queue_draw ();
        void thaw_queue_draw ();
 
        void set_background_color (Gtkmm2ext::Color);
        Gtkmm2ext::Color background_color() const { return _bg_color; }
 
        virtual void item_going_away (Item *, Rect) {}
        virtual void item_shown_or_hidden (Item *);
        void item_visual_property_changed (Item*);
        void item_changed (Item *, Rect);
        void item_moved (Item *, Rect);
 
        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;
 
        virtual bool get_mouse_position (Duple& winpos) const = 0;
 
        sigc::signal<void,Duple const&> MouseMotion;
 
        sigc::signal<void> PreRender;
 
        Duple clamp_to_window (Duple const& winpos, Duple border = Duple());
 
        void zoomed();
 
        std::string indent() const;
        std::string render_indent() const;
        void dump (std::ostream&) const;
 
        virtual void re_enter () = 0;
 
        virtual void start_tooltip_timeout (Item*) {}
        virtual void stop_tooltip_timeout () {}
 
        static void set_tooltip_timeout (uint32_t msecs);
 
        virtual Glib::RefPtr<Pango::Context> get_pango_context() = 0;
 
        void use_intermediate_surface (bool yn = true);
 
        void set_debug_render (bool yn) { _debug_render = yn; }
        bool debug_render() const { return _debug_render; }
 
        bool item_save_restore;
 
protected:
        Root             _root;
        uint32_t         _queue_draw_frozen;
        Rect              frozen_area;
        Gtkmm2ext::Color _bg_color;
        bool             _debug_render;
 
        mutable gint64 _last_render_start_timestamp;
 
        static uint32_t tooltip_timeout_msecs;
 
        void queue_draw_item_area (Item *, Rect);
        Rect compute_draw_item_area (Item *, Rect);
 
        virtual void pick_current_item (int state) = 0;
        virtual void pick_current_item (Duple const &, int state) = 0;
 
        std::list<ScrollGroup*> scrollers;
 
        bool _use_intermediate_surface;
};
 
class LIBCANVAS_API GtkCanvas : public Canvas, public Gtk::EventBox, public Gtkmm2ext::CairoCanvas
{
public:
        GtkCanvas ();
        ~GtkCanvas () { _in_dtor = true ; }
 
        void use_nsglview (bool retina = true);
 
        void request_redraw (Rect const &);
        void request_size (Duple);
        void grab (Item *);
        void ungrab ();
        void focus (Item *);
        void unfocus (Item*);
 
        bool have_grab() const { return _grabbed_item; }
        bool grab_can_translate () const;
 
        Rect visible_area () const;
        Coord width() const;
        Coord height() const;
 
        bool get_mouse_position (Duple& winpos) const;
 
        void set_single_exposure (bool s);
        bool single_exposure () { return _single_exposure; }
 
        void re_enter ();
 
        void start_tooltip_timeout (Item*);
        void stop_tooltip_timeout ();
 
        void queue_draw ();
        void queue_draw_area (int x, int y, int width, int height);
        void queue_resize ();
 
        Glib::RefPtr<Pango::Context> get_pango_context();
 
        /* This is the render method called via the Gtkmm2ext::CairoCanvas API,
           which is distinct from ArdourCanvas.
        */
        void render (Cairo::RefPtr<Cairo::Context> const & ctx, cairo_rectangle_t* r);
        void prepare_for_render () const;
 
        uint32_t background_color() { return Canvas::background_color (); }
 
protected:
        void on_size_allocate (Gtk::Allocation&);
        bool on_scroll_event (GdkEventScroll *);
        bool on_expose_event (GdkEventExpose *);
        bool on_key_press_event (GdkEventKey *);
        bool on_key_release_event (GdkEventKey *);
        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*);
        void on_style_changed (const Glib::RefPtr<Gtk::Style>&);
        bool on_visibility_notify_event (GdkEventVisibility*);
        void on_map();
        void on_unmap();
 
        void on_realize ();
 
        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 *, Rect);
        void item_shown_or_hidden (Item *);
        bool send_leave_event (Item const *, double, double) const;
 
        Item * _current_item;
        Item * _new_current_item;
        Item * _grabbed_item;
        Item * _focused_item;
 
        bool _single_exposure;
        bool _use_image_surface;
 
        sigc::connection tooltip_timeout_connection;
        Item* current_tooltip_item;
        Gtk::Window* tooltip_window;
        Gtk::Label* tooltip_label;
        bool show_tooltip ();
        void hide_tooltip ();
        bool really_start_tooltip_timeout ();
        bool resize_handler ();
 
        bool _in_dtor;
        bool resize_queued;
 
        void* _nsglview;
        Cairo::RefPtr<Cairo::Surface> _canvas_image;
};
 
class LIBCANVAS_API GtkCanvasViewport : public Gtk::Alignment
{
public:
        GtkCanvasViewport (Gtk::Adjustment &, Gtk::Adjustment &);
 
        GtkCanvas* canvas () {
                return &_canvas;
        }
 
protected:
        void on_size_request (Gtk::Requisition *);
 
private:
        GtkCanvas _canvas;
        Gtk::Adjustment& hadjustment;
        Gtk::Adjustment& vadjustment;
 
        void scrolled ();
};
 
}
 
std::ostream& operator<< (std::ostream&, const ArdourCanvas::Canvas&);
 
#endif