2 Copyright (C) 2011-2013 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file canvas/canvas.h
21 * @brief Declaration of the main canvas classes.
24 #ifndef __CANVAS_CANVAS_H__
25 #define __CANVAS_CANVAS_H__
29 #include <gdkmm/window.h>
30 #include <gtkmm/eventbox.h>
31 #include <gtkmm/alignment.h>
32 #include <cairomm/surface.h>
33 #include <cairomm/context.h>
35 #include "pbd/signals.h"
37 #include "gtkmm2ext/cairo_canvas.h"
39 #include "canvas/visibility.h"
40 #include "canvas/root_group.h"
51 namespace ArdourCanvas
58 /** The base class for our different types of canvas.
60 * A canvas is an area which holds a collection of canvas items, which in
61 * turn represent shapes, text, etc.
63 * The canvas has an arbitrarily large area, and is addressed in coordinates
64 * of screen pixels, with an origin of (0, 0) at the top left. x increases
65 * rightwards and y increases downwards.
68 class LIBCANVAS_API Canvas
74 /** called to request a redraw of an area of the canvas in WINDOW coordinates */
75 virtual void request_redraw (Rect const &) = 0;
76 /** called to ask the canvas to request a particular size from its host */
77 virtual void request_size (Duple) = 0;
78 /** called to ask the canvas' host to `grab' an item */
79 virtual void grab (Item *) = 0;
80 /** called to ask the canvas' host to `ungrab' any grabbed item */
81 virtual void ungrab () = 0;
83 /** called to ask the canvas' host to keyboard focus on an item */
84 virtual void focus (Item *) = 0;
85 /** called to ask the canvas' host to drop keyboard focus on an item */
86 virtual void unfocus (Item*) = 0;
88 void render (Rect const &, Cairo::RefPtr<Cairo::Context> const &) const;
90 void prepare_for_render (Rect const &) const;
92 gint64 get_last_render_start_timestamp () const { return _last_render_start_timestamp; }
94 gint64 get_microseconds_since_render_start () const;
96 /** @return root group */
101 void set_background_color (Gtkmm2ext::Color);
102 Gtkmm2ext::Color background_color() const { return _bg_color; }
104 /** Called when an item is being destroyed */
105 virtual void item_going_away (Item *, Rect) {}
106 virtual void item_shown_or_hidden (Item *);
107 void item_visual_property_changed (Item*);
108 void item_changed (Item *, Rect);
109 void item_moved (Item *, Rect);
111 Duple canvas_to_window (Duple const&, bool rounded = true) const;
112 Duple window_to_canvas (Duple const&) const;
114 void canvas_to_window (Coord cx, Coord cy, Coord& wx, Coord& wy) {
115 Duple d = canvas_to_window (Duple (cx, cy));
120 void window_to_canvas (Coord wx, Coord wy, Coord& cx, Coord& cy) {
121 Duple d = window_to_canvas (Duple (wx, wy));
126 void scroll_to (Coord x, Coord y);
127 void add_scroller (ScrollGroup& i);
129 virtual Rect visible_area () const = 0;
130 virtual Coord width () const = 0;
131 virtual Coord height () const = 0;
133 /** Store the coordinates of the mouse pointer in window coordinates in
134 @param winpos. Return true if the position was within the window,
137 virtual bool get_mouse_position (Duple& winpos) const = 0;
139 /** Signal to be used by items that need to track the mouse position
142 sigc::signal<void,Duple const&> MouseMotion;
144 sigc::signal<void> PreRender;
146 /** Ensures that the position given by @param winpos (in window
147 coordinates) is within the current window area, possibly reduced by
150 Duple clamp_to_window (Duple const& winpos, Duple border = Duple());
154 std::string indent() const;
155 std::string render_indent() const;
156 void dump (std::ostream&) const;
158 /** Ask the canvas to pick the current item again, and generate
159 an enter event for it.
161 virtual void re_enter () = 0;
163 virtual void start_tooltip_timeout (Item*) {}
164 virtual void stop_tooltip_timeout () {}
166 /** Set the timeout used to display tooltips, in milliseconds
168 static void set_tooltip_timeout (uint32_t msecs);
170 virtual Glib::RefPtr<Pango::Context> get_pango_context() = 0;
174 Gtkmm2ext::Color _bg_color;
176 mutable gint64 _last_render_start_timestamp;
178 static uint32_t tooltip_timeout_msecs;
180 void queue_draw_item_area (Item *, Rect);
181 virtual void pick_current_item (int state) = 0;
182 virtual void pick_current_item (Duple const &, int state) = 0;
184 std::list<ScrollGroup*> scrollers;
187 /** A canvas which renders onto a GTK EventBox */
188 class LIBCANVAS_API GtkCanvas : public Canvas, public Gtk::EventBox, public Gtkmm2ext::CairoCanvas
192 ~GtkCanvas () { _in_dtor = true ; }
194 void use_nsglview ();
196 void request_redraw (Rect const &);
197 void request_size (Duple);
201 void unfocus (Item*);
203 Rect visible_area () const;
205 Coord height() const;
207 bool get_mouse_position (Duple& winpos) const;
209 void set_single_exposure (bool s) { _single_exposure = s; }
210 bool single_exposure () { return _single_exposure; }
214 void start_tooltip_timeout (Item*);
215 void stop_tooltip_timeout ();
218 void queue_draw_area (int x, int y, int width, int height);
220 Glib::RefPtr<Pango::Context> get_pango_context();
222 void render (Cairo::RefPtr<Cairo::Context> const & ctx, cairo_rectangle_t* r)
224 ArdourCanvas::Rect rect (r->x, r->y, r->width + r->x, r->height + r->y);
225 Canvas::render (rect, ctx);
228 void prepare_for_render () const;
230 uint32_t background_color() { return Canvas::background_color (); }
233 void on_size_allocate (Gtk::Allocation&);
234 bool on_scroll_event (GdkEventScroll *);
235 bool on_expose_event (GdkEventExpose *);
236 bool on_key_press_event (GdkEventKey *);
237 bool on_key_release_event (GdkEventKey *);
238 bool on_button_press_event (GdkEventButton *);
239 bool on_button_release_event (GdkEventButton* event);
240 bool on_motion_notify_event (GdkEventMotion *);
241 bool on_enter_notify_event (GdkEventCrossing*);
242 bool on_leave_notify_event (GdkEventCrossing*);
248 bool button_handler (GdkEventButton *);
249 bool motion_notify_handler (GdkEventMotion *);
250 bool deliver_event (GdkEvent *);
251 void deliver_enter_leave (Duple const & point, int state);
253 void pick_current_item (int state);
254 void pick_current_item (Duple const &, int state);
257 void item_going_away (Item *, Rect);
258 void item_shown_or_hidden (Item *);
259 bool send_leave_event (Item const *, double, double) const;
261 Cairo::RefPtr<Cairo::Surface> canvas_image;
263 /** Item currently chosen for event delivery based on pointer position */
264 Item * _current_item;
265 /** Item pending as _current_item */
266 Item * _new_current_item;
267 /** the item that is currently grabbed, or 0 */
268 Item * _grabbed_item;
269 /** the item that currently has key focus or 0 */
270 Item * _focused_item;
272 bool _single_exposure;
274 sigc::connection tooltip_timeout_connection;
275 Item* current_tooltip_item;
276 Gtk::Window* tooltip_window;
277 Gtk::Label* tooltip_label;
278 bool show_tooltip ();
279 void hide_tooltip ();
280 bool really_start_tooltip_timeout ();
287 /** A GTK::Alignment with a GtkCanvas inside it plus some Gtk::Adjustments for
290 * This provides a GtkCanvas that can be scrolled. It does NOT implement the
291 * Gtk::Scrollable interface.
293 class LIBCANVAS_API GtkCanvasViewport : public Gtk::Alignment
296 GtkCanvasViewport (Gtk::Adjustment &, Gtk::Adjustment &);
298 /** @return our GtkCanvas */
299 GtkCanvas* canvas () {
304 void on_size_request (Gtk::Requisition *);
309 Gtk::Adjustment& hadjustment;
310 Gtk::Adjustment& vadjustment;
317 std::ostream& operator<< (std::ostream&, const ArdourCanvas::Canvas&);