421 lines
29 KiB
HTML
421 lines
29 KiB
HTML
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<h1 class="title">mainwindow.cpp Example File</h1>
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<span class="small-subtitle">widgets/scribble/mainwindow.cpp</span>
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<!-- $$$widgets/scribble/mainwindow.cpp-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/</span>
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<span class="preprocessor">#include <QtGui></span>
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<span class="preprocessor">#include "mainwindow.h"</span>
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<span class="preprocessor">#include "scribblearea.h"</span>
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MainWindow<span class="operator">::</span>MainWindow()
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{
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scribbleArea <span class="operator">=</span> <span class="keyword">new</span> ScribbleArea;
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setCentralWidget(scribbleArea);
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createActions();
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createMenus();
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setWindowTitle(tr(<span class="string">"Scribble"</span>));
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resize(<span class="number">500</span><span class="operator">,</span> <span class="number">500</span>);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>closeEvent(<span class="type"><a href="qcloseevent.html">QCloseEvent</a></span> <span class="operator">*</span>event)
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{
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<span class="keyword">if</span> (maybeSave()) {
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event<span class="operator">-</span><span class="operator">></span>accept();
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} <span class="keyword">else</span> {
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event<span class="operator">-</span><span class="operator">></span>ignore();
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}
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>open()
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{
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<span class="keyword">if</span> (maybeSave()) {
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<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span>
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tr(<span class="string">"Open File"</span>)<span class="operator">,</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>currentPath());
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<span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
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scribbleArea<span class="operator">-</span><span class="operator">></span>openImage(fileName);
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}
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>save()
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{
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<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span><span class="operator">></span>(sender());
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<span class="type"><a href="qbytearray.html">QByteArray</a></span> fileFormat <span class="operator">=</span> action<span class="operator">-</span><span class="operator">></span>data()<span class="operator">.</span>toByteArray();
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saveFile(fileFormat);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>penColor()
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{
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<span class="type"><a href="qcolor.html">QColor</a></span> newColor <span class="operator">=</span> <span class="type"><a href="qcolordialog.html">QColorDialog</a></span><span class="operator">::</span>getColor(scribbleArea<span class="operator">-</span><span class="operator">></span>penColor());
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<span class="keyword">if</span> (newColor<span class="operator">.</span>isValid())
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scribbleArea<span class="operator">-</span><span class="operator">></span>setPenColor(newColor);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>penWidth()
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{
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<span class="type">bool</span> ok;
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<span class="type">int</span> newWidth <span class="operator">=</span> <span class="type"><a href="qinputdialog.html">QInputDialog</a></span><span class="operator">::</span>getInteger(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Scribble"</span>)<span class="operator">,</span>
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tr(<span class="string">"Select pen width:"</span>)<span class="operator">,</span>
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scribbleArea<span class="operator">-</span><span class="operator">></span>penWidth()<span class="operator">,</span>
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<span class="number">1</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>ok);
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<span class="keyword">if</span> (ok)
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scribbleArea<span class="operator">-</span><span class="operator">></span>setPenWidth(newWidth);
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>about()
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{
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<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About Scribble"</span>)<span class="operator">,</span>
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tr(<span class="string">"<p>The <b>Scribble</b> example shows how to use QMainWindow as the "</span>
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<span class="string">"base widget for an application, and how to reimplement some of "</span>
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<span class="string">"QWidget's event handlers to receive the events generated for "</span>
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<span class="string">"the application's widgets:</p><p> We reimplement the mouse event "</span>
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<span class="string">"handlers to facilitate drawing, the paint event handler to "</span>
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<span class="string">"update the application and the resize event handler to optimize "</span>
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<span class="string">"the application's appearance. In addition we reimplement the "</span>
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<span class="string">"close event handler to intercept the close events before "</span>
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<span class="string">"terminating the application.</p><p> The example also demonstrates "</span>
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<span class="string">"how to use QPainter to draw an image in real time, as well as "</span>
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<span class="string">"to repaint widgets.</p>"</span>));
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}
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<span class="type">void</span> MainWindow<span class="operator">::</span>createActions()
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{
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openAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&Open..."</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
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openAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
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connect(openAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(open()));
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foreach (<span class="type"><a href="qbytearray.html">QByteArray</a></span> format<span class="operator">,</span> <span class="type"><a href="qimagewriter.html">QImageWriter</a></span><span class="operator">::</span>supportedImageFormats()) {
|
|
<span class="type"><a href="qstring.html">QString</a></span> text <span class="operator">=</span> tr(<span class="string">"%1..."</span>)<span class="operator">.</span>arg(<span class="type"><a href="qstring.html">QString</a></span>(format)<span class="operator">.</span>toUpper());
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<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(text<span class="operator">,</span> <span class="keyword">this</span>);
|
|
action<span class="operator">-</span><span class="operator">></span>setData(format);
|
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connect(action<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(save()));
|
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saveAsActs<span class="operator">.</span>append(action);
|
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}
|
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printAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&Print..."</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
connect(printAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> scribbleArea<span class="operator">,</span> SLOT(print()));
|
|
|
|
exitAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"E&xit"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
exitAct<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
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|
connect(exitAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
|
|
|
|
penColorAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&Pen Color..."</span>)<span class="operator">,</span> <span class="keyword">this</span>);
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|
connect(penColorAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(penColor()));
|
|
|
|
penWidthAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"Pen &Width..."</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
connect(penWidthAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(penWidth()));
|
|
|
|
clearScreenAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&Clear Screen"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
clearScreenAct<span class="operator">-</span><span class="operator">></span>setShortcut(tr(<span class="string">"Ctrl+L"</span>));
|
|
connect(clearScreenAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
|
|
scribbleArea<span class="operator">,</span> SLOT(clearImage()));
|
|
|
|
aboutAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"&About"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
connect(aboutAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
|
|
|
|
aboutQtAct <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">"About &Qt"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
connect(aboutQtAct<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));
|
|
}
|
|
|
|
<span class="type">void</span> MainWindow<span class="operator">::</span>createMenus()
|
|
{
|
|
saveAsMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">"&Save As"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
foreach (<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>action<span class="operator">,</span> saveAsActs)
|
|
saveAsMenu<span class="operator">-</span><span class="operator">></span>addAction(action);
|
|
|
|
fileMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">"&File"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(openAct);
|
|
fileMenu<span class="operator">-</span><span class="operator">></span>addMenu(saveAsMenu);
|
|
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(printAct);
|
|
fileMenu<span class="operator">-</span><span class="operator">></span>addSeparator();
|
|
fileMenu<span class="operator">-</span><span class="operator">></span>addAction(exitAct);
|
|
|
|
optionMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">"&Options"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
optionMenu<span class="operator">-</span><span class="operator">></span>addAction(penColorAct);
|
|
optionMenu<span class="operator">-</span><span class="operator">></span>addAction(penWidthAct);
|
|
optionMenu<span class="operator">-</span><span class="operator">></span>addSeparator();
|
|
optionMenu<span class="operator">-</span><span class="operator">></span>addAction(clearScreenAct);
|
|
|
|
helpMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">"&Help"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
|
|
helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutAct);
|
|
helpMenu<span class="operator">-</span><span class="operator">></span>addAction(aboutQtAct);
|
|
|
|
menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(fileMenu);
|
|
menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(optionMenu);
|
|
menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(helpMenu);
|
|
}
|
|
|
|
<span class="type">bool</span> MainWindow<span class="operator">::</span>maybeSave()
|
|
{
|
|
<span class="keyword">if</span> (scribbleArea<span class="operator">-</span><span class="operator">></span>isModified()) {
|
|
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>StandardButton ret;
|
|
ret <span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Scribble"</span>)<span class="operator">,</span>
|
|
tr(<span class="string">"The image has been modified.\n"</span>
|
|
<span class="string">"Do you want to save your changes?"</span>)<span class="operator">,</span>
|
|
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Save <span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Discard
|
|
<span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel);
|
|
<span class="keyword">if</span> (ret <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Save) {
|
|
<span class="keyword">return</span> saveFile(<span class="string">"png"</span>);
|
|
} <span class="keyword">else</span> <span class="keyword">if</span> (ret <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel) {
|
|
<span class="keyword">return</span> <span class="keyword">false</span>;
|
|
}
|
|
}
|
|
<span class="keyword">return</span> <span class="keyword">true</span>;
|
|
}
|
|
|
|
<span class="type">bool</span> MainWindow<span class="operator">::</span>saveFile(<span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&</span>fileFormat)
|
|
{
|
|
<span class="type"><a href="qstring.html">QString</a></span> initialPath <span class="operator">=</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>currentPath() <span class="operator">+</span> <span class="string">"/untitled."</span> <span class="operator">+</span> fileFormat;
|
|
|
|
<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getSaveFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Save As"</span>)<span class="operator">,</span>
|
|
initialPath<span class="operator">,</span>
|
|
tr(<span class="string">"%1 Files (*.%2);;All Files (*)"</span>)
|
|
<span class="operator">.</span>arg(<span class="type"><a href="qstring.html">QString</a></span>(fileFormat<span class="operator">.</span>toUpper()))
|
|
<span class="operator">.</span>arg(<span class="type"><a href="qstring.html">QString</a></span>(fileFormat)));
|
|
<span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty()) {
|
|
<span class="keyword">return</span> <span class="keyword">false</span>;
|
|
} <span class="keyword">else</span> {
|
|
<span class="keyword">return</span> scribbleArea<span class="operator">-</span><span class="operator">></span>saveImage(fileName<span class="operator">,</span> fileFormat);
|
|
}
|
|
}</pre>
|
|
</div>
|
|
<!-- @@@widgets/scribble/mainwindow.cpp -->
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="ft">
|
|
<span></span>
|
|
</div>
|
|
</div>
|
|
<div class="footer">
|
|
<p>
|
|
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
|
|
Documentation contributions included herein are the copyrights of
|
|
their respective owners.</p>
|
|
<br />
|
|
<p>
|
|
The documentation provided herein is licensed under the terms of the
|
|
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
|
License version 1.3</a> as published by the Free Software Foundation.</p>
|
|
<p>
|
|
Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
|
www.qt-project.org</a>.</p>
|
|
<br />
|
|
<p>
|
|
Qt and respective logos are trademarks of The Qt Company Ltd
|
|
in Finland and/or other countries worldwide. All other trademarks are property
|
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of their respective owners. <a title="Privacy Policy"
|
|
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
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