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<h1 class="title">diagramscene.cpp Example File</h1>
<span class="subtitle">graphicsview/diagramscene/diagramscene.cpp</span>
<!-- $$$graphicsview/diagramscene/diagramscene.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:
**
** "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 The Qt Company Ltd 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 "diagramscene.h"</span>
<span class="preprocessor">#include "arrow.h"</span>
<span class="preprocessor">#include <QTextCursor></span>
<span class="preprocessor">#include <QGraphicsSceneMouseEvent></span>
DiagramScene<span class="operator">::</span>DiagramScene(<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>itemMenu<span class="operator">,</span> <span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span>(parent)
{
myItemMenu <span class="operator">=</span> itemMenu;
myMode <span class="operator">=</span> MoveItem;
myItemType <span class="operator">=</span> DiagramItem<span class="operator">::</span>Step;
line <span class="operator">=</span> <span class="number">0</span>;
textItem <span class="operator">=</span> <span class="number">0</span>;
myItemColor <span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white;
myTextColor <span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black;
myLineColor <span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black;
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>setLineColor(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> <span class="operator">&</span>color)
{
myLineColor <span class="operator">=</span> color;
<span class="keyword">if</span> (isItemChange(Arrow<span class="operator">::</span>Type)) {
Arrow <span class="operator">*</span>item <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>Arrow <span class="operator">*</span><span class="operator">></span>(selectedItems()<span class="operator">.</span>first());
item<span class="operator">-</span><span class="operator">></span>setColor(myLineColor);
update();
}
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>setTextColor(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> <span class="operator">&</span>color)
{
myTextColor <span class="operator">=</span> color;
<span class="keyword">if</span> (isItemChange(DiagramTextItem<span class="operator">::</span>Type)) {
DiagramTextItem <span class="operator">*</span>item <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>DiagramTextItem <span class="operator">*</span><span class="operator">></span>(selectedItems()<span class="operator">.</span>first());
item<span class="operator">-</span><span class="operator">></span>setDefaultTextColor(myTextColor);
}
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>setItemColor(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> <span class="operator">&</span>color)
{
myItemColor <span class="operator">=</span> color;
<span class="keyword">if</span> (isItemChange(DiagramItem<span class="operator">::</span>Type)) {
DiagramItem <span class="operator">*</span>item <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>DiagramItem <span class="operator">*</span><span class="operator">></span>(selectedItems()<span class="operator">.</span>first());
item<span class="operator">-</span><span class="operator">></span>setBrush(myItemColor);
}
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>setFont(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> <span class="operator">&</span>font)
{
myFont <span class="operator">=</span> font;
<span class="keyword">if</span> (isItemChange(DiagramTextItem<span class="operator">::</span>Type)) {
<span class="type"><a href="qgraphicstextitem.html">QGraphicsTextItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>DiagramTextItem <span class="operator">*</span><span class="operator">></span>(selectedItems()<span class="operator">.</span>first());
<span class="comment">//At this point the selection can change so the first selected item might not be a DiagramTextItem</span>
<span class="keyword">if</span> (item)
item<span class="operator">-</span><span class="operator">></span>setFont(myFont);
}
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>setMode(Mode mode)
{
myMode <span class="operator">=</span> mode;
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>setItemType(DiagramItem<span class="operator">::</span>DiagramType type)
{
myItemType <span class="operator">=</span> type;
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>editorLostFocus(DiagramTextItem <span class="operator">*</span>item)
{
<span class="type"><a href="../qtgui/qtextcursor.html">QTextCursor</a></span> cursor <span class="operator">=</span> item<span class="operator">-</span><span class="operator">></span>textCursor();
cursor<span class="operator">.</span>clearSelection();
item<span class="operator">-</span><span class="operator">></span>setTextCursor(cursor);
<span class="keyword">if</span> (item<span class="operator">-</span><span class="operator">></span>toPlainText()<span class="operator">.</span>isEmpty()) {
removeItem(item);
item<span class="operator">-</span><span class="operator">></span>deleteLater();
}
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>mouseEvent)
{
<span class="keyword">if</span> (mouseEvent<span class="operator">-</span><span class="operator">></span>button() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton)
<span class="keyword">return</span>;
DiagramItem <span class="operator">*</span>item;
<span class="keyword">switch</span> (myMode) {
<span class="keyword">case</span> InsertItem:
item <span class="operator">=</span> <span class="keyword">new</span> DiagramItem(myItemType<span class="operator">,</span> myItemMenu);
item<span class="operator">-</span><span class="operator">></span>setBrush(myItemColor);
addItem(item);
item<span class="operator">-</span><span class="operator">></span>setPos(mouseEvent<span class="operator">-</span><span class="operator">></span>scenePos());
<span class="keyword">emit</span> itemInserted(item);
<span class="keyword">break</span>;
<span class="keyword">case</span> InsertLine:
line <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicslineitem.html">QGraphicsLineItem</a></span>(<span class="type"><a href="../qtcore/qlinef.html">QLineF</a></span>(mouseEvent<span class="operator">-</span><span class="operator">></span>scenePos()<span class="operator">,</span>
mouseEvent<span class="operator">-</span><span class="operator">></span>scenePos()));
line<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(myLineColor<span class="operator">,</span> <span class="number">2</span>));
addItem(line);
<span class="keyword">break</span>;
<span class="keyword">case</span> InsertText:
textItem <span class="operator">=</span> <span class="keyword">new</span> DiagramTextItem();
textItem<span class="operator">-</span><span class="operator">></span>setFont(myFont);
textItem<span class="operator">-</span><span class="operator">></span>setTextInteractionFlags(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>TextEditorInteraction);
textItem<span class="operator">-</span><span class="operator">></span>setZValue(<span class="number">1000.0</span>);
connect(textItem<span class="operator">,</span> SIGNAL(lostFocus(DiagramTextItem<span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(editorLostFocus(DiagramTextItem<span class="operator">*</span>)));
connect(textItem<span class="operator">,</span> SIGNAL(selectedChange(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">*</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SIGNAL(itemSelected(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">*</span>)));
addItem(textItem);
textItem<span class="operator">-</span><span class="operator">></span>setDefaultTextColor(myTextColor);
textItem<span class="operator">-</span><span class="operator">></span>setPos(mouseEvent<span class="operator">-</span><span class="operator">></span>scenePos());
<span class="keyword">emit</span> textInserted(textItem);
<span class="keyword">default</span>:
;
}
<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span><span class="operator">::</span>mousePressEvent(mouseEvent);
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>mouseEvent)
{
<span class="keyword">if</span> (myMode <span class="operator">=</span><span class="operator">=</span> InsertLine <span class="operator">&</span><span class="operator">&</span> line <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>) {
<span class="type"><a href="../qtcore/qlinef.html">QLineF</a></span> newLine(line<span class="operator">-</span><span class="operator">></span>line()<span class="operator">.</span>p1()<span class="operator">,</span> mouseEvent<span class="operator">-</span><span class="operator">></span>scenePos());
line<span class="operator">-</span><span class="operator">></span>setLine(newLine);
} <span class="keyword">else</span> <span class="keyword">if</span> (myMode <span class="operator">=</span><span class="operator">=</span> MoveItem) {
<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span><span class="operator">::</span>mouseMoveEvent(mouseEvent);
}
}
<span class="type">void</span> DiagramScene<span class="operator">::</span>mouseReleaseEvent(<span class="type"><a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a></span> <span class="operator">*</span>mouseEvent)
{
<span class="keyword">if</span> (line <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> myMode <span class="operator">=</span><span class="operator">=</span> InsertLine) {
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> startItems <span class="operator">=</span> items(line<span class="operator">-</span><span class="operator">></span>line()<span class="operator">.</span>p1());
<span class="keyword">if</span> (startItems<span class="operator">.</span>count() <span class="operator">&</span><span class="operator">&</span> startItems<span class="operator">.</span>first() <span class="operator">=</span><span class="operator">=</span> line)
startItems<span class="operator">.</span>removeFirst();
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">></span> endItems <span class="operator">=</span> items(line<span class="operator">-</span><span class="operator">></span>line()<span class="operator">.</span>p2());
<span class="keyword">if</span> (endItems<span class="operator">.</span>count() <span class="operator">&</span><span class="operator">&</span> endItems<span class="operator">.</span>first() <span class="operator">=</span><span class="operator">=</span> line)
endItems<span class="operator">.</span>removeFirst();
removeItem(line);
<span class="keyword">delete</span> line;
<span class="keyword">if</span> (startItems<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> endItems<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span>
startItems<span class="operator">.</span>first()<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> DiagramItem<span class="operator">::</span>Type <span class="operator">&</span><span class="operator">&</span>
endItems<span class="operator">.</span>first()<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> DiagramItem<span class="operator">::</span>Type <span class="operator">&</span><span class="operator">&</span>
startItems<span class="operator">.</span>first() <span class="operator">!</span><span class="operator">=</span> endItems<span class="operator">.</span>first()) {
DiagramItem <span class="operator">*</span>startItem <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>DiagramItem <span class="operator">*</span><span class="operator">></span>(startItems<span class="operator">.</span>first());
DiagramItem <span class="operator">*</span>endItem <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>DiagramItem <span class="operator">*</span><span class="operator">></span>(endItems<span class="operator">.</span>first());
Arrow <span class="operator">*</span>arrow <span class="operator">=</span> <span class="keyword">new</span> Arrow(startItem<span class="operator">,</span> endItem);
arrow<span class="operator">-</span><span class="operator">></span>setColor(myLineColor);
startItem<span class="operator">-</span><span class="operator">></span>addArrow(arrow);
endItem<span class="operator">-</span><span class="operator">></span>addArrow(arrow);
arrow<span class="operator">-</span><span class="operator">></span>setZValue(<span class="operator">-</span><span class="number">1000.0</span>);
addItem(arrow);
arrow<span class="operator">-</span><span class="operator">></span>updatePosition();
}
}
line <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span><span class="operator">::</span>mouseReleaseEvent(mouseEvent);
}
bool DiagramScene<span class="operator">::</span>isItemChange(<span class="type">int</span> type)
{
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> selectedItems()) {
<span class="keyword">if</span> (item<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> type)
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="keyword">return</span> <span class="keyword">false</span>;
}
</pre>
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<!-- @@@graphicsview/diagramscene/diagramscene.cpp -->
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Documentation contributions included herein are the copyrights of
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distrib
>
Mageia
>
6
>
armv5tl
>
media
>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
3879
