forked from Kitware/VTK
-
Notifications
You must be signed in to change notification settings - Fork 0
/
vtkObserverMediator.cxx
179 lines (156 loc) · 5.04 KB
/
vtkObserverMediator.cxx
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*=========================================================================
Program: Visualization Toolkit
Module: vtkObserverMediator.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkObserverMediator.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkObjectFactory.h"
#include "vtkPriorityQueue.h"
#include "vtkInteractorObserver.h"
#include <map>
vtkStandardNewMacro(vtkObserverMediator);
// PIMPL the map representing the observer (key) to cursor request
// (data). Note that only observers who are requesting non-default cursors
// are placed into the map.
// Comparison functor based on observer priorities (for the purpose of sorting
// the cursor request in the map).
struct vtkObserverCompare
{
bool operator()(vtkInteractorObserver* w1, vtkInteractorObserver* w2) const
{
float p1 = w1->GetPriority();
float p2 = w2->GetPriority();
if ( p1 < p2 )
{
return true;
}
else if ( p1 == p2 )
{
if ( w1 < w2 )
{
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}
};
// The important feature of the map is that it sorts data (based on the functor above).
class vtkObserverMap : public std::map<vtkInteractorObserver*,int,vtkObserverCompare>
{
public:
vtkObserverMap() : std::map<vtkInteractorObserver*,int,vtkObserverCompare>() {}
};
typedef vtkObserverMap::iterator ObserverMapIterator;
//----------------------------------------------------------------------------
vtkObserverMediator::vtkObserverMediator()
{
this->Interactor = NULL;
this->ObserverMap = new vtkObserverMap;
this->CurrentObserver = NULL;
this->CurrentCursorShape = VTK_CURSOR_DEFAULT;
}
//----------------------------------------------------------------------------
vtkObserverMediator::~vtkObserverMediator()
{
delete this->ObserverMap;
}
//----------------------------------------------------------------------------
void vtkObserverMediator::SetInteractor(vtkRenderWindowInteractor* i)
{
this->Interactor = i;
}
//----------------------------------------------------------------------------
// This mediation process works by keeping track of non-default cursor
// requests.
// Ties are broken based on widget priority (hence the priority queue).
int vtkObserverMediator::RequestCursorShape(vtkInteractorObserver *w, int requestedShape)
{
if ( !this->Interactor || !w )
{
return 0;
}
// First remove previous requests from the map. Note we have to use our own
// special version of find() because the sorting of the map using the function
// vtkObserverCompare() screws up the usual find().
ObserverMapIterator iter = this->ObserverMap->begin();
for ( ; iter != this->ObserverMap->end(); ++iter )
{
if ( (*iter).first == w )
{
this->ObserverMap->erase(iter);
break;
}
}
// Now see whether we have to set to the default cursor, or add the latest request.
if ( this->ObserverMap->empty() && requestedShape == VTK_CURSOR_DEFAULT &&
this->CurrentCursorShape != VTK_CURSOR_DEFAULT )
{
this->Interactor->GetRenderWindow()->SetCurrentCursor(VTK_CURSOR_DEFAULT);
this->CurrentCursorShape = VTK_CURSOR_DEFAULT;
return 1;
}
else if ( requestedShape != VTK_CURSOR_DEFAULT )
{
(*this->ObserverMap)[w] = requestedShape;
// Find the highest priority and set that
if ( ! this->ObserverMap->empty() )
{
iter = this->ObserverMap->end();
--iter; //this is the observer with the highest priority
// Have to set the current cursor repeatedly or it reverts back to default
// (at least on windows it does).
this->Interactor->GetRenderWindow()->SetCurrentCursor((*iter).second);
if ( this->CurrentCursorShape != (*iter).second )
{
this->CurrentCursorShape = (*iter).second;
return 1;
}
}
}
return 0;
}
//----------------------------------------------------------------------------
void vtkObserverMediator::RemoveAllCursorShapeRequests(vtkInteractorObserver *w)
{
if (w)
{
ObserverMapIterator iter = this->ObserverMap->begin();
for ( ; iter != this->ObserverMap->end(); ++iter )
{
if ( (*iter).first == w )
{
this->ObserverMap->erase(iter);
break;
}
}
}
}
//----------------------------------------------------------------------------
void vtkObserverMediator::PrintSelf(ostream& os, vtkIndent indent)
{
//Superclass typedef defined in vtkTypeMacro() found in vtkSetGet.h
this->Superclass::PrintSelf(os,indent);
os << indent << "Render Window Interactor: ";
if ( this->Interactor )
{
os << this->Interactor << "\n";
}
else
{
os << "(None)\n";
}
}