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1 // The canvas for rendering with the 2d API
2 //
3 // Copyright (C) 2012  Thomas Geymayer <tomgey@gmail.com>
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Library General Public
7 // License as published by the Free Software Foundation; either
8 // version 2 of the License, or (at your option) any later version.
9 //
10 // This library 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 GNU
13 // Library General Public License for more details.
14 //
15 // You should have received a copy of the GNU Library General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
18
19 #ifndef CANVAS_HXX_
20 #define CANVAS_HXX_
21
22 #include "canvas_fwd.hxx"
23 #include "ODGauge.hxx"
24
25 #include <simgear/canvas/elements/CanvasGroup.hxx>
26 #include <simgear/props/PropertyBasedElement.hxx>
27 #include <simgear/props/propertyObject.hxx>
28 #include <osg/NodeCallback>
29 #include <osg/observer_ptr>
30
31 #include <memory>
32 #include <string>
33
34 namespace simgear
35 {
36 namespace canvas
37 {
38   class CanvasMgr;
39   class MouseEvent;
40
41   class Canvas:
42     public PropertyBasedElement
43   {
44     public:
45
46       enum StatusFlags
47       {
48         STATUS_OK,
49         MISSING_SIZE_X = 0x0001,
50         MISSING_SIZE_Y = 0x0002,
51         CREATE_FAILED  = 0x0004
52       };
53
54       /**
55        * This callback is installed on every placement of the canvas in the
56        * scene to only render the canvas if at least one placement is visible
57        */
58       class CullCallback:
59         public osg::NodeCallback
60       {
61         public:
62           CullCallback(const CanvasWeakPtr& canvas);
63
64         private:
65           CanvasWeakPtr _canvas;
66
67           virtual void operator()(osg::Node* node, osg::NodeVisitor* nv);
68       };
69       typedef osg::ref_ptr<CullCallback> CullCallbackPtr;
70
71       Canvas(SGPropertyNode* node);
72       virtual ~Canvas();
73
74       void setSystemAdapter(const SystemAdapterPtr& system_adapter);
75       SystemAdapterPtr getSystemAdapter() const;
76
77       void setCanvasMgr(CanvasMgr* canvas_mgr);
78       CanvasMgr* getCanvasMgr() const;
79
80       /**
81        * Add a canvas which should be mared as dirty upon any change to this
82        * canvas.
83        *
84        * This mechanism is used to eg. redraw a canvas if it's displaying
85        * another canvas (recursive canvases)
86        */
87       void addDependentCanvas(const CanvasWeakPtr& canvas);
88
89       /**
90        * Stop notifying the given canvas upon changes
91        */
92       void removeDependentCanvas(const CanvasWeakPtr& canvas);
93
94       /**
95        * Enable rendering for the next frame
96        *
97        * @param force   Force redraw even if nothing has changed (if dirty flag
98        *                is not set)
99        */
100       void enableRendering(bool force = false);
101
102       void update(double delta_time_sec);
103
104       void setSizeX(int sx);
105       void setSizeY(int sy);
106
107       int getSizeX() const;
108       int getSizeY() const;
109
110       void setViewWidth(int w);
111       void setViewHeight(int h);
112
113       bool handleMouseEvent(const MouseEvent& event);
114
115       virtual void childAdded( SGPropertyNode * parent,
116                                SGPropertyNode * child );
117       virtual void childRemoved( SGPropertyNode * parent,
118                                  SGPropertyNode * child );
119       virtual void valueChanged (SGPropertyNode * node);
120
121       osg::Texture2D* getTexture() const;
122
123       CullCallbackPtr getCullCallback() const;
124
125       static void addPlacementFactory( const std::string& type,
126                                        PlacementFactory factory );
127
128     protected:
129
130       SystemAdapterPtr  _system_adapter;
131       CanvasMgr        *_canvas_mgr;
132
133       int _size_x,
134           _size_y,
135           _view_width,
136           _view_height;
137
138       PropertyObject<int>           _status;
139       PropertyObject<std::string>   _status_msg;
140
141       PropertyObject<int>   _mouse_x, _mouse_y,
142                             _mouse_dx, _mouse_dy,
143                             _mouse_button,
144                             _mouse_state,
145                             _mouse_mod,
146                             _mouse_scroll,
147                             _mouse_event;
148
149       bool _sampling_dirty,
150            _render_dirty,
151            _visible;
152
153       ODGauge _texture;
154       std::auto_ptr<Group> _root_group;
155
156       CullCallbackPtr _cull_callback;
157       bool _render_always; //<! Used to disable automatic lazy rendering (culling)
158
159       std::vector<SGPropertyNode*> _dirty_placements;
160       std::vector<canvas::Placements> _placements;
161       std::set<CanvasWeakPtr> _dependent_canvases; //<! Canvases which use this
162                                                    //   canvas and should be
163                                                    //   notified about changes
164
165       typedef std::map<std::string, canvas::PlacementFactory> PlacementFactoryMap;
166       static PlacementFactoryMap _placement_factories;
167
168       virtual void setSelf(const PropertyBasedElementPtr& self);
169       void setStatusFlags(unsigned int flags, bool set = true);
170
171     private:
172
173       Canvas(const Canvas&); // = delete;
174       Canvas& operator=(const Canvas&); // = delete;
175   };
176
177 } // namespace canvas
178 } // namespace simgear
179
180 #endif /* CANVAS_HXX_ */