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<h1 class="title">view.cpp Example File</h1>
<span class="subtitle">drilldown/view.cpp</span>
<!-- $$$drilldown/view.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
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  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;informationwindow.h&quot;</span>
  <span class="preprocessor">#include &quot;imageitem.h&quot;</span>
  <span class="preprocessor">#include &quot;view.h&quot;</span>

  View<span class="operator">::</span>View(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>items<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>images<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="../qtwidgets/qgraphicsview.html">QGraphicsView</a></span>(parent)
  {
      itemTable <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a></span>(<span class="keyword">this</span>);
      itemTable<span class="operator">-</span><span class="operator">&gt;</span>setTable(items);
      itemTable<span class="operator">-</span><span class="operator">&gt;</span>setRelation(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qsqlrelation.html">QSqlRelation</a></span>(images<span class="operator">,</span> <span class="string">&quot;itemid&quot;</span><span class="operator">,</span> <span class="string">&quot;file&quot;</span>));
      itemTable<span class="operator">-</span><span class="operator">&gt;</span>select();

      scene <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qgraphicsscene.html">QGraphicsScene</a></span>(<span class="keyword">this</span>);
      scene<span class="operator">-</span><span class="operator">&gt;</span>setSceneRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">465</span><span class="operator">,</span> <span class="number">365</span>);
      setScene(scene);

      addItems();

      setMinimumSize(<span class="number">470</span><span class="operator">,</span> <span class="number">370</span>);
      setMaximumSize(<span class="number">470</span><span class="operator">,</span> <span class="number">370</span>);

      <span class="type">QLinearGradient</span> gradient(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">370</span>));
      gradient<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type">QColor</span>(<span class="string">&quot;#868482&quot;</span>));
      gradient<span class="operator">.</span>setColorAt(<span class="number">1</span><span class="operator">,</span> <span class="type">QColor</span>(<span class="string">&quot;#5d5b59&quot;</span>));
      setBackgroundBrush(gradient);
  }

  <span class="type">void</span> View<span class="operator">::</span>addItems()
  {
      <span class="type">int</span> itemCount <span class="operator">=</span> itemTable<span class="operator">-</span><span class="operator">&gt;</span>rowCount();

      <span class="type">int</span> imageOffset <span class="operator">=</span> <span class="number">150</span>;
      <span class="type">int</span> leftMargin <span class="operator">=</span> <span class="number">70</span>;
      <span class="type">int</span> topMargin <span class="operator">=</span> <span class="number">40</span>;

      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> itemCount; i<span class="operator">+</span><span class="operator">+</span>) {
          <span class="type"><a href="qsqlrecord.html">QSqlRecord</a></span> record <span class="operator">=</span> itemTable<span class="operator">-</span><span class="operator">&gt;</span>record(i);

          <span class="type">int</span> id <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;id&quot;</span>)<span class="operator">.</span>toInt();
          <span class="type"><a href="../qtcore/qstring.html">QString</a></span> file <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;file&quot;</span>)<span class="operator">.</span>toString();
          <span class="type"><a href="../qtcore/qstring.html">QString</a></span> item <span class="operator">=</span> record<span class="operator">.</span>value(<span class="string">&quot;itemtype&quot;</span>)<span class="operator">.</span>toString();

          <span class="type">int</span> columnOffset <span class="operator">=</span> ((i <span class="operator">%</span> <span class="number">2</span>) <span class="operator">*</span> <span class="number">37</span>);
          <span class="type">int</span> x <span class="operator">=</span> ((i <span class="operator">%</span> <span class="number">2</span>) <span class="operator">*</span> imageOffset) <span class="operator">+</span> leftMargin <span class="operator">+</span> columnOffset;
          <span class="type">int</span> y <span class="operator">=</span> ((i <span class="operator">/</span> <span class="number">2</span>) <span class="operator">*</span> imageOffset) <span class="operator">+</span> topMargin;

          ImageItem <span class="operator">*</span>image <span class="operator">=</span> <span class="keyword">new</span> ImageItem(id<span class="operator">,</span> <span class="type">QPixmap</span>(<span class="string">&quot;:/&quot;</span> <span class="operator">+</span> file));
          image<span class="operator">-</span><span class="operator">&gt;</span>setData(<span class="number">0</span><span class="operator">,</span> i);
          image<span class="operator">-</span><span class="operator">&gt;</span>setPos(x<span class="operator">,</span> y);
          scene<span class="operator">-</span><span class="operator">&gt;</span>addItem(image);

          <span class="type"><a href="../qtwidgets/qgraphicstextitem.html">QGraphicsTextItem</a></span> <span class="operator">*</span>label <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">&gt;</span>addText(item);
          label<span class="operator">-</span><span class="operator">&gt;</span>setDefaultTextColor(<span class="type">QColor</span>(<span class="string">&quot;#d7d6d5&quot;</span>));
          <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> labelOffset((<span class="number">120</span> <span class="operator">-</span> label<span class="operator">-</span><span class="operator">&gt;</span>boundingRect()<span class="operator">.</span>width()) <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="number">120.0</span>);
          label<span class="operator">-</span><span class="operator">&gt;</span>setPos(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(x<span class="operator">,</span> y) <span class="operator">+</span> labelOffset);
      }
  }

  <span class="type">void</span> View<span class="operator">::</span>mouseReleaseEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>event)
  {
      <span class="keyword">if</span> (<span class="type"><a href="../qtwidgets/qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> itemAt(event<span class="operator">-</span><span class="operator">&gt;</span>pos())) {
          <span class="keyword">if</span> (ImageItem <span class="operator">*</span>image <span class="operator">=</span> qgraphicsitem_cast<span class="operator">&lt;</span>ImageItem <span class="operator">*</span><span class="operator">&gt;</span>(item))
              showInformation(image);
      }
      <span class="type"><a href="../qtwidgets/qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>mouseReleaseEvent(event);
  }

  <span class="type">void</span> View<span class="operator">::</span>showInformation(ImageItem <span class="operator">*</span>image)
  {
      <span class="type">int</span> id <span class="operator">=</span> image<span class="operator">-</span><span class="operator">&gt;</span>id();
      <span class="keyword">if</span> (id <span class="operator">&lt;</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> id <span class="operator">&gt;</span><span class="operator">=</span> itemTable<span class="operator">-</span><span class="operator">&gt;</span>rowCount())
          <span class="keyword">return</span>;

      InformationWindow <span class="operator">*</span>window <span class="operator">=</span> findWindow(id);
      <span class="keyword">if</span> (<span class="operator">!</span>window) {
          window <span class="operator">=</span> <span class="keyword">new</span> InformationWindow(id<span class="operator">,</span> itemTable<span class="operator">,</span> <span class="keyword">this</span>);

          connect(window<span class="operator">,</span> <span class="type">QOverload</span><span class="operator">&lt;</span><span class="type">int</span><span class="operator">,</span><span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span><span class="operator">&gt;</span><span class="operator">::</span>of(<span class="operator">&amp;</span>InformationWindow<span class="operator">::</span>imageChanged)<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> <span class="type">QOverload</span><span class="operator">&lt;</span><span class="type">int</span><span class="operator">,</span><span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span><span class="operator">&gt;</span><span class="operator">::</span>of(<span class="operator">&amp;</span>View<span class="operator">::</span>updateImage));

          window<span class="operator">-</span><span class="operator">&gt;</span>move(pos() <span class="operator">+</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="number">20</span><span class="operator">,</span> <span class="number">40</span>));
          window<span class="operator">-</span><span class="operator">&gt;</span>show();
          informationWindows<span class="operator">.</span>append(window);
      }

      <span class="keyword">if</span> (window<span class="operator">-</span><span class="operator">&gt;</span>isVisible()) {
          window<span class="operator">-</span><span class="operator">&gt;</span>raise();
          window<span class="operator">-</span><span class="operator">&gt;</span>activateWindow();
      } <span class="keyword">else</span>
          window<span class="operator">-</span><span class="operator">&gt;</span>show();
  }

  <span class="type">void</span> View<span class="operator">::</span>updateImage(<span class="type">int</span> id<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName)
  {
      <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtwidgets/qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">&gt;</span> items <span class="operator">=</span> scene<span class="operator">-</span><span class="operator">&gt;</span>items();

      <span class="keyword">while</span>(<span class="operator">!</span>items<span class="operator">.</span>empty()) {
          <span class="type"><a href="../qtwidgets/qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> items<span class="operator">.</span>takeFirst();

          <span class="keyword">if</span> (ImageItem <span class="operator">*</span>image <span class="operator">=</span> qgraphicsitem_cast<span class="operator">&lt;</span>ImageItem <span class="operator">*</span><span class="operator">&gt;</span>(item)) {
              <span class="keyword">if</span> (image<span class="operator">-</span><span class="operator">&gt;</span>id() <span class="operator">=</span><span class="operator">=</span> id){
                  image<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(<span class="type">QPixmap</span>(<span class="string">&quot;:/&quot;</span> <span class="operator">+</span>fileName));
                  image<span class="operator">-</span><span class="operator">&gt;</span>adjust();
                  <span class="keyword">break</span>;
              }
          }
      }
  }

  InformationWindow <span class="operator">*</span>View<span class="operator">::</span>findWindow(<span class="type">int</span> id) <span class="keyword">const</span>
  {
      <span class="keyword">for</span> (<span class="keyword">auto</span> window : informationWindows) {
          <span class="keyword">if</span> (window <span class="operator">&amp;</span><span class="operator">&amp;</span> (window<span class="operator">-</span><span class="operator">&gt;</span>id() <span class="operator">=</span><span class="operator">=</span> id))
              <span class="keyword">return</span> window;
      }
      <span class="keyword">return</span> nullptr;
  }

</pre>
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<!-- @@@drilldown/view.cpp -->
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