This file is indexed.

/usr/include/Wt/WViewWidget is in libwt-dev 3.3.6+dfsg-1.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
180
181
182
183
184
185
186
187
188
189
190
// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WVIEWWIDGET_H_
#define WVIEWWIDGET_H_

#include <Wt/WWebWidget>

namespace Wt {

/*! \class WViewWidget Wt/WViewWidget Wt/WViewWidget
 *  \brief An abstract base class for an MVC view that is rendered using a
 *         widget.
 *
 * In principle, %Wt widgets are self-contained and manage both their
 * content, behavior and layout. From the point of view of a
 * Model-View-Controller (MVC) design pattern, they implement each of
 * these, except for the view widgets that work in conjunction with
 * WAbstractItemModel. As a developer you can chose to keep Model,
 * View and Controller together or separate them as you wish.
 *
 * This widget facilitates separation of the View from the Model and
 * Controller in a particular way. The %View is rendered as a %Wt
 * widget. The use of this widget provides two benefits. The classic
 * MVC benefit is a decoupling between view and model, which may allow
 * easier maintainance of code. In addition, this widget enforces the
 * View to be stateless, as it is only created transiently on the
 * server. Therefore the View does not require session resources. This
 * may increase scalability for Internet-deployments.
 *
 * The rendered View widget returned by renderView() should reflect
 * the current model state. Whenever the model changes, rerendering
 * can be triggered by calling update().
 *
 * Currently, the View cannot enclose \link WFormWidget
 * WFormWidgets\endlink which would allow direct manipulation of the
 * model (but we are working to remove this limitation in the future,
 * and let the Model/Controller handle editing changes) and the View
 * may only be updated by a complete rerendering of the entire view.
 *
 * The View widget may contain event handling code, but only in one of
 * the following ways:
 * <ul>
 *   <li>event handling implemented directly in JavaScript code</li>
 *   <li>event handling implemented in pre-learned stateless slot
 *     implementations</li>
 * </ul>
 * Thus, currently, event handling code related to the View cannot be
 * implemented at server-side (but we are thinking about a solution for
 * this as well...).
 *
 * \if cpp
 * Implementation example:
 * \code
 * // Shows the contents for a specific role of a model index in a WText widget
 * class SourceView : public Wt::WViewWidget
 * {
 * public:
 *   // role is the ItemDataRole
 *   SourceView(int role)
 *     : role_(role)
 *   { }
 *
 *   // set an index
 *   void setIndex(const Wt::WModelIndex& index) {
 *     if (index != index_
 *         && (!index.isValid() || !index.data(role_).empty())) {
 *       index_ = index;
 *       update(); // trigger rerendering of the view
 *     }
 *   }
 *
 * private:
 *   Wt::WModelIndex index_;
 *   int             role_;
 *
 * protected:
 *   virtual Wt::WWidget *renderView() {
 *     Wt::WText *result = new Wt::WText();
 *     result->setInline(false);
 *
 *     if (!index_.isValid())
 *       return result;
 *
 *     boost::any d = index_.data(role_);
 *     const std::string& t = boost::any_cast<const std::string&>(d);
 *
 *     result->setTextFormat(Wt::PlainText);
 *     result->setText(t);
 *
 *     return result;
 *   }
 * };
 * 
 * \endcode
 * \endif
 *
 * <h3>CSS</h3>
 *
 * This widget does not provide styling, 
 * and can be styled using inline or external CSS as appropriate.
 */
class WT_API WViewWidget : public WWebWidget
{
public:
  /*! \brief Creates a new view widget.
   */
  WViewWidget(WContainerWidget *parent = 0);

  /*! \brief Updates the view.
   *
   * Typically, the model will want to update the view when the model
   * has changed.
   *
   * This will trigger a call to renderView() to ask for a new rendering of
   * the view.
   */
  void update();

  virtual void load();
  virtual void render(WFlags<RenderFlag> flags);
  virtual void refresh();

protected:
  /*! \brief Creates a widget that renders the View.
   *
   * This method must be reimplemented to return a widget that renders the
   * view. The returned widget will be deleted by %WViewWidget.
   */
  virtual WWidget *renderView() = 0;

  virtual void updateDom(DomElement& element, bool all);
  virtual void propagateRenderOk(bool deep);
  virtual DomElementType domElementType() const;

  virtual void doneRerender();

private:
  WWidget *contents_;
  bool needContentsUpdate_;
};

/*! \class WStaticModelView Wt/WViewWidget Wt/WViewWidget
 *  \brief A widget that implements a view for a non-changing model.
 *
 * This model uses a function object which is passed in the
 * constructor to render the View, and does not react to changes.
 *
 * You may want to use the utility function Wt::makeStaticModel() to create an
 * instance of this class.
 */
template <typename Renderer>
class WStaticModelView : public WViewWidget
{
public:
  /*! \brief Creates a new static model view, given a function
   *         object to render the View widget.
   */
  WStaticModelView(Renderer f, WContainerWidget *parent = 0)
    : WViewWidget(parent),
      f_(f) { }

protected:
  WWidget *renderView() {
    return f_();
  }

  Renderer f_;
};

/*! \brief Wraps a widget into a view with a non-changing model.
 *
 * The ViewRenderer is called without arguments and must return a
 * newly created widget (WWidget *).
 *
 * \relates WStaticModelView
 */
template <typename Renderer>
WStaticModelView<Renderer>
*makeStaticModel(Renderer f, WContainerWidget *parent = 0)
{
  return new WStaticModelView<Renderer>(f, parent);
}

}

#endif // WVIEWWIDGET_H_