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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #pragma once
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23
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24 #include "../../Framework/OpenGL/WebAssemblyOpenGLContext.h"
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25 #include "../../Framework/Scene2D/OpenGLCompositor.h"
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26 #include "../../Framework/Scene2D/PanSceneTracker.h"
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27 #include "../../Framework/Scene2D/RotateSceneTracker.h"
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28 #include "../../Framework/Scene2D/ZoomSceneTracker.h"
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29 #include "../../Framework/Scene2DViewport/ViewportController.h"
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30 #include "../../Framework/Scene2DViewport/UndoStack.h"
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31
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32 #include <Core/OrthancException.h>
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33 #include <boost/make_shared.hpp>
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34
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35 #include <emscripten/html5.h>
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36
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37 static const unsigned int FONT_SIZE = 32;
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38
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39 namespace OrthancStone
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40 {
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41 class WebAssemblyViewport : public boost::noncopyable
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42 {
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43 private:
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44 // the construction order is important because compositor_
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45 // will hold a reference to the scene that belong to the
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46 // controller_ object
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47 OpenGL::WebAssemblyOpenGLContext context_;
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48 boost::shared_ptr<ViewportController> controller_;
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49 OpenGLCompositor compositor_;
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50
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51 void SetupEvents(const std::string& canvas);
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52
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53 public:
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54 WebAssemblyViewport(MessageBroker& broker,
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55 const std::string& canvas) :
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56 context_(canvas),
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57 controller_(new ViewportController(boost::make_shared<UndoStack>(), broker)),
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58 compositor_(context_, *controller_->GetScene())
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59 {
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60 compositor_.SetFont(0, Orthanc::EmbeddedResources::UBUNTU_FONT,
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61 FONT_SIZE, Orthanc::Encoding_Latin1);
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62 SetupEvents(canvas);
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63 }
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64
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65 Scene2D& GetScene()
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66 {
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67 return *controller_->GetScene();
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68 }
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69
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70 const boost::shared_ptr<ViewportController>& GetController()
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71 {
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72 return controller_;
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73 }
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74
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75 void UpdateSize()
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76 {
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77 context_.UpdateSize();
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78 compositor_.UpdateSize();
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79 Refresh();
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80 }
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81
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82 void Refresh()
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83 {
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84 compositor_.Refresh();
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85 }
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86
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87 void FitContent()
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88 {
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89 GetScene().FitContent(context_.GetCanvasWidth(), context_.GetCanvasHeight());
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90 }
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91
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92 const std::string& GetCanvasIdentifier() const
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93 {
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94 return context_.GetCanvasIdentifier();
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95 }
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96
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97 ScenePoint2D GetPixelCenterCoordinates(int x, int y) const
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98 {
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99 return compositor_.GetPixelCenterCoordinates(x, y);
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100 }
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101
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102 unsigned int GetCanvasWidth() const
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103 {
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104 return context_.GetCanvasWidth();
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105 }
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106
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107 unsigned int GetCanvasHeight() const
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108 {
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109 return context_.GetCanvasHeight();
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110 }
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111 };
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112
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113 class ActiveTracker : public boost::noncopyable
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114 {
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115 private:
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116 boost::shared_ptr<IFlexiblePointerTracker> tracker_;
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117 std::string canvasIdentifier_;
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118 bool insideCanvas_;
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119
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120 public:
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121 ActiveTracker(const boost::shared_ptr<IFlexiblePointerTracker>& tracker,
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122 const WebAssemblyViewport& viewport) :
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123 tracker_(tracker),
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124 canvasIdentifier_(viewport.GetCanvasIdentifier()),
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125 insideCanvas_(true)
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126 {
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127 if (tracker_.get() == NULL)
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128 {
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129 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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130 }
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131 }
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132
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133 bool IsAlive() const
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134 {
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135 return tracker_->IsAlive();
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136 }
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137
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138 void PointerMove(const PointerEvent& event)
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139 {
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140 tracker_->PointerMove(event);
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141 }
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142
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143 void PointerUp(const PointerEvent& event)
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144 {
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145 tracker_->PointerUp(event);
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146 }
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147 };
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148 }
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149
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150 static OrthancStone::PointerEvent* ConvertMouseEvent(
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151 const EmscriptenMouseEvent& source,
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152 OrthancStone::WebAssemblyViewport& viewport)
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153 {
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154 std::auto_ptr<OrthancStone::PointerEvent> target(
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155 new OrthancStone::PointerEvent);
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156
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157 target->AddPosition(viewport.GetPixelCenterCoordinates(
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158 source.targetX, source.targetY));
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159 target->SetAltModifier(source.altKey);
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160 target->SetControlModifier(source.ctrlKey);
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161 target->SetShiftModifier(source.shiftKey);
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162
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163 return target.release();
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164 }
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165
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166 std::auto_ptr<OrthancStone::ActiveTracker> tracker_;
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167
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168 EM_BOOL OnMouseEvent(int eventType,
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169 const EmscriptenMouseEvent *mouseEvent,
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170 void *userData)
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171 {
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172 if (mouseEvent != NULL &&
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173 userData != NULL)
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174 {
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175 OrthancStone::WebAssemblyViewport& viewport =
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176 *reinterpret_cast<OrthancStone::WebAssemblyViewport*>(userData);
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177
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178 switch (eventType)
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179 {
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180 case EMSCRIPTEN_EVENT_CLICK:
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181 {
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182 static unsigned int count = 0;
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183 char buf[64];
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184 sprintf(buf, "click %d", count++);
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185
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186 std::auto_ptr<OrthancStone::TextSceneLayer> layer(new OrthancStone::TextSceneLayer);
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187 layer->SetText(buf);
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188 viewport.GetScene().SetLayer(100, layer.release());
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189 viewport.Refresh();
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190 break;
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191 }
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192
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193 case EMSCRIPTEN_EVENT_MOUSEDOWN:
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194 {
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195 boost::shared_ptr<OrthancStone::IFlexiblePointerTracker> t;
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196
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197 {
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198 std::auto_ptr<OrthancStone::PointerEvent> event(
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199 ConvertMouseEvent(*mouseEvent, viewport));
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200
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201 switch (mouseEvent->button)
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202 {
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203 case 0: // Left button
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204 emscripten_console_log("Creating RotateSceneTracker");
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205 t.reset(new OrthancStone::RotateSceneTracker(
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206 viewport.GetController(), *event));
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207 break;
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208
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209 case 1: // Middle button
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210 emscripten_console_log("Creating PanSceneTracker");
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211 LOG(INFO) << "Creating PanSceneTracker" ;
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212 t.reset(new OrthancStone::PanSceneTracker(
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213 viewport.GetController(), *event));
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214 break;
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215
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216 case 2: // Right button
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217 emscripten_console_log("Creating ZoomSceneTracker");
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218 t.reset(new OrthancStone::ZoomSceneTracker(
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219 viewport.GetController(), *event, viewport.GetCanvasWidth()));
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220 break;
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221
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222 default:
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223 break;
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224 }
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225 }
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226
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227 if (t.get() != NULL)
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228 {
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229 tracker_.reset(
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230 new OrthancStone::ActiveTracker(t, viewport));
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231 viewport.Refresh();
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232 }
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233
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234 break;
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235 }
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236
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237 case EMSCRIPTEN_EVENT_MOUSEMOVE:
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238 if (tracker_.get() != NULL)
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239 {
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240 std::auto_ptr<OrthancStone::PointerEvent> event(
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241 ConvertMouseEvent(*mouseEvent, viewport));
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242 tracker_->PointerMove(*event);
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243 viewport.Refresh();
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244 }
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245 break;
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246
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247 case EMSCRIPTEN_EVENT_MOUSEUP:
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248 if (tracker_.get() != NULL)
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249 {
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250 std::auto_ptr<OrthancStone::PointerEvent> event(
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251 ConvertMouseEvent(*mouseEvent, viewport));
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252 tracker_->PointerUp(*event);
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253 viewport.Refresh();
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254 if (!tracker_->IsAlive())
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255 tracker_.reset();
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256 }
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257 break;
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258
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259 default:
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260 break;
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261 }
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262 }
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263
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264 return true;
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265 }
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266
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267
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268 void OrthancStone::WebAssemblyViewport::SetupEvents(const std::string& canvas)
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269 {
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270 emscripten_set_mousedown_callback(canvas.c_str(), this, false, OnMouseEvent);
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271 emscripten_set_mousemove_callback(canvas.c_str(), this, false, OnMouseEvent);
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272 emscripten_set_mouseup_callback(canvas.c_str(), this, false, OnMouseEvent);
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273 }
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