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<h1 class="title">pieview.cpp Example File</h1>
<span class="small-subtitle">itemviews/chart/pieview.cpp</span>
<!-- $$$itemviews/chart/pieview.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "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
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <math.h></span>
<span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#ifndef M_PI</span>
<span class="preprocessor">#define M_PI 3.1415927</span>
<span class="preprocessor">#endif</span>
<span class="preprocessor">#include "pieview.h"</span>
PieView<span class="operator">::</span>PieView(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span>(parent)
{
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
margin <span class="operator">=</span> <span class="number">8</span>;
totalSize <span class="operator">=</span> <span class="number">300</span>;
pieSize <span class="operator">=</span> totalSize <span class="operator">-</span> <span class="number">2</span><span class="operator">*</span>margin;
validItems <span class="operator">=</span> <span class="number">0</span>;
totalValue <span class="operator">=</span> <span class="number">0.0</span>;
rubberBand <span class="operator">=</span> <span class="number">0</span>;
}
<span class="type">void</span> PieView<span class="operator">::</span>dataChanged(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>topLeft<span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>bottomRight)
{
<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>dataChanged(topLeft<span class="operator">,</span> bottomRight);
validItems <span class="operator">=</span> <span class="number">0</span>;
totalValue <span class="operator">=</span> <span class="number">0.0</span>;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(rootIndex()); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="type">double</span> value <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble();
<span class="keyword">if</span> (value <span class="operator">></span> <span class="number">0.0</span>) {
totalValue <span class="operator">+</span><span class="operator">=</span> value;
validItems<span class="operator">+</span><span class="operator">+</span>;
}
}
viewport()<span class="operator">-</span><span class="operator">></span>update();
}
<span class="type">bool</span> PieView<span class="operator">::</span>edit(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index<span class="operator">,</span> EditTrigger trigger<span class="operator">,</span> <span class="type"><a href="qevent.html">QEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (index<span class="operator">.</span>column() <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span> <span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>edit(index<span class="operator">,</span> trigger<span class="operator">,</span> event);
<span class="keyword">else</span>
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="comment">/*
Returns the item that covers the coordinate given in the view.
*/</span>
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> PieView<span class="operator">::</span>indexAt(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&</span>point) <span class="keyword">const</span>
{
<span class="keyword">if</span> (validItems <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span>();
<span class="comment">// Transform the view coordinates into contents widget coordinates.</span>
<span class="type">int</span> wx <span class="operator">=</span> point<span class="operator">.</span>x() <span class="operator">+</span> horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value();
<span class="type">int</span> wy <span class="operator">=</span> point<span class="operator">.</span>y() <span class="operator">+</span> verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value();
<span class="keyword">if</span> (wx <span class="operator"><</span> totalSize) {
<span class="type">double</span> cx <span class="operator">=</span> wx <span class="operator">-</span> totalSize<span class="operator">/</span><span class="number">2</span>;
<span class="type">double</span> cy <span class="operator">=</span> totalSize<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> wy; <span class="comment">// positive cy for items above the center</span>
<span class="comment">// Determine the distance from the center point of the pie chart.</span>
<span class="type">double</span> d <span class="operator">=</span> pow(pow(cx<span class="operator">,</span> <span class="number">2</span>) <span class="operator">+</span> pow(cy<span class="operator">,</span> <span class="number">2</span>)<span class="operator">,</span> <span class="number">0.5</span>);
<span class="keyword">if</span> (d <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> d <span class="operator">></span> pieSize<span class="operator">/</span><span class="number">2</span>)
<span class="keyword">return</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span>();
<span class="comment">// Determine the angle of the point.</span>
<span class="type">double</span> angle <span class="operator">=</span> (<span class="number">180</span> <span class="operator">/</span> M_PI) <span class="operator">*</span> acos(cx<span class="operator">/</span>d);
<span class="keyword">if</span> (cy <span class="operator"><</span> <span class="number">0</span>)
angle <span class="operator">=</span> <span class="number">360</span> <span class="operator">-</span> angle;
<span class="comment">// Find the relevant slice of the pie.</span>
<span class="type">double</span> startAngle <span class="operator">=</span> <span class="number">0.0</span>;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(rootIndex()); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="type">double</span> value <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble();
<span class="keyword">if</span> (value <span class="operator">></span> <span class="number">0.0</span>) {
<span class="type">double</span> sliceAngle <span class="operator">=</span> <span class="number">360</span><span class="operator">*</span>value<span class="operator">/</span>totalValue;
<span class="keyword">if</span> (angle <span class="operator">></span><span class="operator">=</span> startAngle <span class="operator">&</span><span class="operator">&</span> angle <span class="operator"><</span> (startAngle <span class="operator">+</span> sliceAngle))
<span class="keyword">return</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
startAngle <span class="operator">+</span><span class="operator">=</span> sliceAngle;
}
}
} <span class="keyword">else</span> {
<span class="type">double</span> itemHeight <span class="operator">=</span> <span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span>(viewOptions()<span class="operator">.</span>font)<span class="operator">.</span>height();
<span class="type">int</span> listItem <span class="operator">=</span> <span class="type">int</span>((wy <span class="operator">-</span> margin) <span class="operator">/</span> itemHeight);
<span class="type">int</span> validRow <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(rootIndex()); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="keyword">if</span> (model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble() <span class="operator">></span> <span class="number">0.0</span>) {
<span class="keyword">if</span> (listItem <span class="operator">=</span><span class="operator">=</span> validRow)
<span class="keyword">return</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> rootIndex());
<span class="comment">// Update the list index that corresponds to the next valid row.</span>
validRow<span class="operator">+</span><span class="operator">+</span>;
}
}
}
<span class="keyword">return</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span>();
}
<span class="type">bool</span> PieView<span class="operator">::</span>isIndexHidden(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span> <span class="comment">/*index*/</span>) <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="comment">/*
Returns the rectangle of the item at position \a index in the
model. The rectangle is in contents coordinates.
*/</span>
<span class="type"><a href="qrect.html">QRect</a></span> PieView<span class="operator">::</span>itemRect(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span>
{
<span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid())
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>();
<span class="comment">// Check whether the index's row is in the list of rows represented</span>
<span class="comment">// by slices.</span>
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> valueIndex;
<span class="keyword">if</span> (index<span class="operator">.</span>column() <span class="operator">!</span><span class="operator">=</span> <span class="number">1</span>)
valueIndex <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(index<span class="operator">.</span>row()<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="keyword">else</span>
valueIndex <span class="operator">=</span> index;
<span class="keyword">if</span> (model()<span class="operator">-</span><span class="operator">></span>data(valueIndex)<span class="operator">.</span>toDouble() <span class="operator">></span> <span class="number">0.0</span>) {
<span class="type">int</span> listItem <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> index<span class="operator">.</span>row()<span class="operator">-</span><span class="number">1</span>; row <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>; <span class="operator">-</span><span class="operator">-</span>row) {
<span class="keyword">if</span> (model()<span class="operator">-</span><span class="operator">></span>data(model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex()))<span class="operator">.</span>toDouble() <span class="operator">></span> <span class="number">0.0</span>)
listItem<span class="operator">+</span><span class="operator">+</span>;
}
<span class="type">double</span> itemHeight;
<span class="keyword">switch</span> (index<span class="operator">.</span>column()) {
<span class="keyword">case</span> <span class="number">0</span>:
itemHeight <span class="operator">=</span> <span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span>(viewOptions()<span class="operator">.</span>font)<span class="operator">.</span>height();
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>(totalSize<span class="operator">,</span>
<span class="type">int</span>(margin <span class="operator">+</span> listItem<span class="operator">*</span>itemHeight)<span class="operator">,</span>
totalSize <span class="operator">-</span> margin<span class="operator">,</span> <span class="type">int</span>(itemHeight));
<span class="keyword">case</span> <span class="number">1</span>:
<span class="keyword">return</span> viewport()<span class="operator">-</span><span class="operator">></span>rect();
}
}
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>();
}
<span class="type"><a href="qregion.html">QRegion</a></span> PieView<span class="operator">::</span>itemRegion(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span>
{
<span class="keyword">if</span> (<span class="operator">!</span>index<span class="operator">.</span>isValid())
<span class="keyword">return</span> <span class="type"><a href="qregion.html">QRegion</a></span>();
<span class="keyword">if</span> (index<span class="operator">.</span>column() <span class="operator">!</span><span class="operator">=</span> <span class="number">1</span>)
<span class="keyword">return</span> itemRect(index);
<span class="keyword">if</span> (model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble() <span class="operator"><</span><span class="operator">=</span> <span class="number">0.0</span>)
<span class="keyword">return</span> <span class="type"><a href="qregion.html">QRegion</a></span>();
<span class="type">double</span> startAngle <span class="operator">=</span> <span class="number">0.0</span>;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(rootIndex()); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> sliceIndex <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="type">double</span> value <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>data(sliceIndex)<span class="operator">.</span>toDouble();
<span class="keyword">if</span> (value <span class="operator">></span> <span class="number">0.0</span>) {
<span class="type">double</span> angle <span class="operator">=</span> <span class="number">360</span><span class="operator">*</span>value<span class="operator">/</span>totalValue;
<span class="keyword">if</span> (sliceIndex <span class="operator">=</span><span class="operator">=</span> index) {
<span class="type"><a href="qpainterpath.html">QPainterPath</a></span> slicePath;
slicePath<span class="operator">.</span>moveTo(totalSize<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> totalSize<span class="operator">/</span><span class="number">2</span>);
slicePath<span class="operator">.</span>arcTo(margin<span class="operator">,</span> margin<span class="operator">,</span> margin<span class="operator">+</span>pieSize<span class="operator">,</span> margin<span class="operator">+</span>pieSize<span class="operator">,</span>
startAngle<span class="operator">,</span> angle);
slicePath<span class="operator">.</span>closeSubpath();
<span class="keyword">return</span> <span class="type"><a href="qregion.html">QRegion</a></span>(slicePath<span class="operator">.</span>toFillPolygon()<span class="operator">.</span>toPolygon());
}
startAngle <span class="operator">+</span><span class="operator">=</span> angle;
}
}
<span class="keyword">return</span> <span class="type"><a href="qregion.html">QRegion</a></span>();
}
<span class="type">int</span> PieView<span class="operator">::</span>horizontalOffset() <span class="keyword">const</span>
{
<span class="keyword">return</span> horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value();
}
<span class="type">void</span> PieView<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>mousePressEvent(event);
origin <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
<span class="keyword">if</span> (<span class="operator">!</span>rubberBand)
rubberBand <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qrubberband.html">QRubberBand</a></span>(<span class="type"><a href="qrubberband.html">QRubberBand</a></span><span class="operator">::</span>Rectangle<span class="operator">,</span> viewport());
rubberBand<span class="operator">-</span><span class="operator">></span>setGeometry(<span class="type"><a href="qrect.html">QRect</a></span>(origin<span class="operator">,</span> <span class="type"><a href="qsize.html">QSize</a></span>()));
rubberBand<span class="operator">-</span><span class="operator">></span>show();
}
<span class="type">void</span> PieView<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (rubberBand)
rubberBand<span class="operator">-</span><span class="operator">></span>setGeometry(<span class="type"><a href="qrect.html">QRect</a></span>(origin<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>pos())<span class="operator">.</span>normalized());
<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>mouseMoveEvent(event);
}
<span class="type">void</span> PieView<span class="operator">::</span>mouseReleaseEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>mouseReleaseEvent(event);
<span class="keyword">if</span> (rubberBand)
rubberBand<span class="operator">-</span><span class="operator">></span>hide();
viewport()<span class="operator">-</span><span class="operator">></span>update();
}
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> PieView<span class="operator">::</span>moveCursor(<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>CursorAction cursorAction<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>KeyboardModifiers <span class="comment">/*modifiers*/</span>)
{
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> current <span class="operator">=</span> currentIndex();
<span class="keyword">switch</span> (cursorAction) {
<span class="keyword">case</span> MoveLeft:
<span class="keyword">case</span> MoveUp:
<span class="keyword">if</span> (current<span class="operator">.</span>row() <span class="operator">></span> <span class="number">0</span>)
current <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(current<span class="operator">.</span>row() <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> current<span class="operator">.</span>column()<span class="operator">,</span>
rootIndex());
<span class="keyword">else</span>
current <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(<span class="number">0</span><span class="operator">,</span> current<span class="operator">.</span>column()<span class="operator">,</span> rootIndex());
<span class="keyword">break</span>;
<span class="keyword">case</span> MoveRight:
<span class="keyword">case</span> MoveDown:
<span class="keyword">if</span> (current<span class="operator">.</span>row() <span class="operator"><</span> rows(current) <span class="operator">-</span> <span class="number">1</span>)
current <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(current<span class="operator">.</span>row() <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> current<span class="operator">.</span>column()<span class="operator">,</span>
rootIndex());
<span class="keyword">else</span>
current <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(rows(current) <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> current<span class="operator">.</span>column()<span class="operator">,</span>
rootIndex());
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
viewport()<span class="operator">-</span><span class="operator">></span>update();
<span class="keyword">return</span> current;
}
<span class="type">void</span> PieView<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qitemselectionmodel.html">QItemSelectionModel</a></span> <span class="operator">*</span>selections <span class="operator">=</span> selectionModel();
<span class="type"><a href="qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> option <span class="operator">=</span> viewOptions();
<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>State state <span class="operator">=</span> option<span class="operator">.</span>state;
<span class="type"><a href="qbrush.html">QBrush</a></span> background <span class="operator">=</span> option<span class="operator">.</span>palette<span class="operator">.</span>base();
<span class="type"><a href="qpen.html">QPen</a></span> foreground(option<span class="operator">.</span>palette<span class="operator">.</span>color(<span class="type"><a href="qpalette.html">QPalette</a></span><span class="operator">::</span>WindowText));
<span class="type"><a href="qpen.html">QPen</a></span> textPen(option<span class="operator">.</span>palette<span class="operator">.</span>color(<span class="type"><a href="qpalette.html">QPalette</a></span><span class="operator">::</span>Text));
<span class="type"><a href="qpen.html">QPen</a></span> highlightedPen(option<span class="operator">.</span>palette<span class="operator">.</span>color(<span class="type"><a href="qpalette.html">QPalette</a></span><span class="operator">::</span>HighlightedText));
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(viewport());
painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing);
painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> background);
painter<span class="operator">.</span>setPen(foreground);
<span class="comment">// Viewport rectangles</span>
<span class="type"><a href="qrect.html">QRect</a></span> pieRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>(margin<span class="operator">,</span> margin<span class="operator">,</span> pieSize<span class="operator">,</span> pieSize);
<span class="type"><a href="qpoint.html">QPoint</a></span> keyPoint <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(totalSize <span class="operator">-</span> horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span>
margin <span class="operator">-</span> verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value());
<span class="keyword">if</span> (validItems <span class="operator">></span> <span class="number">0</span>) {
painter<span class="operator">.</span>save();
painter<span class="operator">.</span>translate(pieRect<span class="operator">.</span>x() <span class="operator">-</span> horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span>
pieRect<span class="operator">.</span>y() <span class="operator">-</span> verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value());
painter<span class="operator">.</span>drawEllipse(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> pieSize<span class="operator">,</span> pieSize);
<span class="type">double</span> startAngle <span class="operator">=</span> <span class="number">0.0</span>;
<span class="type">int</span> row;
<span class="keyword">for</span> (row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(rootIndex()); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="type">double</span> value <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble();
<span class="keyword">if</span> (value <span class="operator">></span> <span class="number">0.0</span>) {
<span class="type">double</span> angle <span class="operator">=</span> <span class="number">360</span><span class="operator">*</span>value<span class="operator">/</span>totalValue;
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> colorIndex <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> rootIndex());
<span class="type"><a href="qcolor.html">QColor</a></span> color <span class="operator">=</span> <span class="type"><a href="qcolor.html">QColor</a></span>(model()<span class="operator">-</span><span class="operator">></span>data(colorIndex<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>DecorationRole)<span class="operator">.</span>toString());
<span class="keyword">if</span> (currentIndex() <span class="operator">=</span><span class="operator">=</span> index)
painter<span class="operator">.</span>setBrush(<span class="type"><a href="qbrush.html">QBrush</a></span>(color<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense4Pattern));
<span class="keyword">else</span> <span class="keyword">if</span> (selections<span class="operator">-</span><span class="operator">></span>isSelected(index))
painter<span class="operator">.</span>setBrush(<span class="type"><a href="qbrush.html">QBrush</a></span>(color<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense3Pattern));
<span class="keyword">else</span>
painter<span class="operator">.</span>setBrush(<span class="type"><a href="qbrush.html">QBrush</a></span>(color));
painter<span class="operator">.</span>drawPie(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> pieSize<span class="operator">,</span> pieSize<span class="operator">,</span> <span class="type">int</span>(startAngle<span class="operator">*</span><span class="number">16</span>)<span class="operator">,</span>
<span class="type">int</span>(angle<span class="operator">*</span><span class="number">16</span>));
startAngle <span class="operator">+</span><span class="operator">=</span> angle;
}
}
painter<span class="operator">.</span>restore();
<span class="type">int</span> keyNumber <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">for</span> (row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(rootIndex()); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="type">double</span> value <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble();
<span class="keyword">if</span> (value <span class="operator">></span> <span class="number">0.0</span>) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> labelIndex <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> rootIndex());
<span class="type"><a href="qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> option <span class="operator">=</span> viewOptions();
option<span class="operator">.</span>rect <span class="operator">=</span> visualRect(labelIndex);
<span class="keyword">if</span> (selections<span class="operator">-</span><span class="operator">></span>isSelected(labelIndex))
option<span class="operator">.</span>state <span class="operator">|</span><span class="operator">=</span> <span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>State_Selected;
<span class="keyword">if</span> (currentIndex() <span class="operator">=</span><span class="operator">=</span> labelIndex)
option<span class="operator">.</span>state <span class="operator">|</span><span class="operator">=</span> <span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>State_HasFocus;
itemDelegate()<span class="operator">-</span><span class="operator">></span>paint(<span class="operator">&</span>painter<span class="operator">,</span> option<span class="operator">,</span> labelIndex);
keyNumber<span class="operator">+</span><span class="operator">+</span>;
}
}
}
}
<span class="type">void</span> PieView<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span> <span class="comment">/* event */</span>)
{
updateGeometries();
}
<span class="type">int</span> PieView<span class="operator">::</span>rows(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span>
{
<span class="keyword">return</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(model()<span class="operator">-</span><span class="operator">></span>parent(index));
}
<span class="type">void</span> PieView<span class="operator">::</span>rowsInserted(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent<span class="operator">,</span> <span class="type">int</span> start<span class="operator">,</span> <span class="type">int</span> end)
{
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> start; row <span class="operator"><</span><span class="operator">=</span> end; <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="type">double</span> value <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble();
<span class="keyword">if</span> (value <span class="operator">></span> <span class="number">0.0</span>) {
totalValue <span class="operator">+</span><span class="operator">=</span> value;
validItems<span class="operator">+</span><span class="operator">+</span>;
}
}
<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>rowsInserted(parent<span class="operator">,</span> start<span class="operator">,</span> end);
}
<span class="type">void</span> PieView<span class="operator">::</span>rowsAboutToBeRemoved(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>parent<span class="operator">,</span> <span class="type">int</span> start<span class="operator">,</span> <span class="type">int</span> end)
{
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> start; row <span class="operator"><</span><span class="operator">=</span> end; <span class="operator">+</span><span class="operator">+</span>row) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> rootIndex());
<span class="type">double</span> value <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>data(index)<span class="operator">.</span>toDouble();
<span class="keyword">if</span> (value <span class="operator">></span> <span class="number">0.0</span>) {
totalValue <span class="operator">-</span><span class="operator">=</span> value;
validItems<span class="operator">-</span><span class="operator">-</span>;
}
}
<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>rowsAboutToBeRemoved(parent<span class="operator">,</span> start<span class="operator">,</span> end);
}
<span class="type">void</span> PieView<span class="operator">::</span>scrollContentsBy(<span class="type">int</span> dx<span class="operator">,</span> <span class="type">int</span> dy)
{
viewport()<span class="operator">-</span><span class="operator">></span>scroll(dx<span class="operator">,</span> dy);
}
<span class="type">void</span> PieView<span class="operator">::</span>scrollTo(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index<span class="operator">,</span> ScrollHint)
{
<span class="type"><a href="qrect.html">QRect</a></span> area <span class="operator">=</span> viewport()<span class="operator">-</span><span class="operator">></span>rect();
<span class="type"><a href="qrect.html">QRect</a></span> rect <span class="operator">=</span> visualRect(index);
<span class="keyword">if</span> (rect<span class="operator">.</span>left() <span class="operator"><</span> area<span class="operator">.</span>left())
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>setValue(
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value() <span class="operator">+</span> rect<span class="operator">.</span>left() <span class="operator">-</span> area<span class="operator">.</span>left());
<span class="keyword">else</span> <span class="keyword">if</span> (rect<span class="operator">.</span>right() <span class="operator">></span> area<span class="operator">.</span>right())
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>setValue(
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value() <span class="operator">+</span> <a href="qtglobal.html#qMin">qMin</a>(
rect<span class="operator">.</span>right() <span class="operator">-</span> area<span class="operator">.</span>right()<span class="operator">,</span> rect<span class="operator">.</span>left() <span class="operator">-</span> area<span class="operator">.</span>left()));
<span class="keyword">if</span> (rect<span class="operator">.</span>top() <span class="operator"><</span> area<span class="operator">.</span>top())
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>setValue(
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value() <span class="operator">+</span> rect<span class="operator">.</span>top() <span class="operator">-</span> area<span class="operator">.</span>top());
<span class="keyword">else</span> <span class="keyword">if</span> (rect<span class="operator">.</span>bottom() <span class="operator">></span> area<span class="operator">.</span>bottom())
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>setValue(
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value() <span class="operator">+</span> <a href="qtglobal.html#qMin">qMin</a>(
rect<span class="operator">.</span>bottom() <span class="operator">-</span> area<span class="operator">.</span>bottom()<span class="operator">,</span> rect<span class="operator">.</span>top() <span class="operator">-</span> area<span class="operator">.</span>top()));
update();
}
<span class="comment">/*
Find the indices corresponding to the extent of the selection.
*/</span>
<span class="type">void</span> PieView<span class="operator">::</span>setSelection(<span class="keyword">const</span> <span class="type"><a href="qrect.html">QRect</a></span> <span class="operator">&</span>rect<span class="operator">,</span> <span class="type"><a href="qitemselectionmodel.html">QItemSelectionModel</a></span><span class="operator">::</span>SelectionFlags command)
{
<span class="comment">// Use content widget coordinates because we will use the itemRegion()</span>
<span class="comment">// function to check for intersections.</span>
<span class="type"><a href="qrect.html">QRect</a></span> contentsRect <span class="operator">=</span> rect<span class="operator">.</span>translated(
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span>
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value())<span class="operator">.</span>normalized();
<span class="type">int</span> rows <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>rowCount(rootIndex());
<span class="type">int</span> columns <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>columnCount(rootIndex());
<span class="type"><a href="qmodelindex.html#QModelIndexList-typedef">QModelIndexList</a></span> indexes;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> rows; <span class="operator">+</span><span class="operator">+</span>row) {
<span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator"><</span> columns; <span class="operator">+</span><span class="operator">+</span>column) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> column<span class="operator">,</span> rootIndex());
<span class="type"><a href="qregion.html">QRegion</a></span> region <span class="operator">=</span> itemRegion(index);
<span class="keyword">if</span> (<span class="operator">!</span>region<span class="operator">.</span>intersect(contentsRect)<span class="operator">.</span>isEmpty())
indexes<span class="operator">.</span>append(index);
}
}
<span class="keyword">if</span> (indexes<span class="operator">.</span>size() <span class="operator">></span> <span class="number">0</span>) {
<span class="type">int</span> firstRow <span class="operator">=</span> indexes<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>row();
<span class="type">int</span> lastRow <span class="operator">=</span> indexes<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>row();
<span class="type">int</span> firstColumn <span class="operator">=</span> indexes<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>column();
<span class="type">int</span> lastColumn <span class="operator">=</span> indexes<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>column();
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator"><</span> indexes<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
firstRow <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(firstRow<span class="operator">,</span> indexes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>row());
lastRow <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(lastRow<span class="operator">,</span> indexes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>row());
firstColumn <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(firstColumn<span class="operator">,</span> indexes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>column());
lastColumn <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(lastColumn<span class="operator">,</span> indexes<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>column());
}
<span class="type"><a href="qitemselection.html">QItemSelection</a></span> selection(
model()<span class="operator">-</span><span class="operator">></span>index(firstRow<span class="operator">,</span> firstColumn<span class="operator">,</span> rootIndex())<span class="operator">,</span>
model()<span class="operator">-</span><span class="operator">></span>index(lastRow<span class="operator">,</span> lastColumn<span class="operator">,</span> rootIndex()));
selectionModel()<span class="operator">-</span><span class="operator">></span>select(selection<span class="operator">,</span> command);
} <span class="keyword">else</span> {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> noIndex;
<span class="type"><a href="qitemselection.html">QItemSelection</a></span> selection(noIndex<span class="operator">,</span> noIndex);
selectionModel()<span class="operator">-</span><span class="operator">></span>select(selection<span class="operator">,</span> command);
}
update();
}
<span class="type">void</span> PieView<span class="operator">::</span>updateGeometries()
{
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>setPageStep(viewport()<span class="operator">-</span><span class="operator">></span>width());
horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">0</span><span class="operator">,</span> <span class="number">2</span><span class="operator">*</span>totalSize <span class="operator">-</span> viewport()<span class="operator">-</span><span class="operator">></span>width()));
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>setPageStep(viewport()<span class="operator">-</span><span class="operator">></span>height());
verticalScrollBar()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">0</span><span class="operator">,</span> totalSize <span class="operator">-</span> viewport()<span class="operator">-</span><span class="operator">></span>height()));
}
<span class="type">int</span> PieView<span class="operator">::</span>verticalOffset() <span class="keyword">const</span>
{
<span class="keyword">return</span> verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value();
}
<span class="comment">/*
Returns the position of the item in viewport coordinates.
*/</span>
<span class="type"><a href="qrect.html">QRect</a></span> PieView<span class="operator">::</span>visualRect(<span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&</span>index) <span class="keyword">const</span>
{
<span class="type"><a href="qrect.html">QRect</a></span> rect <span class="operator">=</span> itemRect(index);
<span class="keyword">if</span> (rect<span class="operator">.</span>isValid())
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>(rect<span class="operator">.</span>left() <span class="operator">-</span> horizontalScrollBar()<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span>
rect<span class="operator">.</span>top() <span class="operator">-</span> verticalScrollBar()<span class="operator">-</span><span class="operator">></span>value()<span class="operator">,</span>
rect<span class="operator">.</span>width()<span class="operator">,</span> rect<span class="operator">.</span>height());
<span class="keyword">else</span>
<span class="keyword">return</span> rect;
}
<span class="comment">/*
Returns a region corresponding to the selection in viewport coordinates.
*/</span>
<span class="type"><a href="qregion.html">QRegion</a></span> PieView<span class="operator">::</span>visualRegionForSelection(<span class="keyword">const</span> <span class="type"><a href="qitemselection.html">QItemSelection</a></span> <span class="operator">&</span>selection) <span class="keyword">const</span>
{
<span class="type">int</span> ranges <span class="operator">=</span> selection<span class="operator">.</span>count();
<span class="keyword">if</span> (ranges <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>();
<span class="type"><a href="qregion.html">QRegion</a></span> region;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> ranges; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="qitemselectionrange.html">QItemSelectionRange</a></span> range <span class="operator">=</span> selection<span class="operator">.</span>at(i);
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> range<span class="operator">.</span>top(); row <span class="operator"><</span><span class="operator">=</span> range<span class="operator">.</span>bottom(); <span class="operator">+</span><span class="operator">+</span>row) {
<span class="keyword">for</span> (<span class="type">int</span> col <span class="operator">=</span> range<span class="operator">.</span>left(); col <span class="operator"><</span><span class="operator">=</span> range<span class="operator">.</span>right(); <span class="operator">+</span><span class="operator">+</span>col) {
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> index <span class="operator">=</span> model()<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> col<span class="operator">,</span> rootIndex());
region <span class="operator">+</span><span class="operator">=</span> visualRect(index);
}
}
}
<span class="keyword">return</span> region;
}</pre>
</div>
<!-- @@@itemviews/chart/pieview.cpp -->
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