diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/examples/contiguouscache.qdoc | 97 | ||||
| -rw-r--r-- | doc/src/examples/fancybrowser.qdoc | 103 | ||||
| -rw-r--r-- | doc/src/qnamespace.qdoc | 8 | ||||
| -rw-r--r-- | doc/src/qset.qdoc | 2 | ||||
| -rw-r--r-- | doc/src/snippets/sqldatabase/sqldatabase.cpp | 2 |
5 files changed, 207 insertions, 5 deletions
diff --git a/doc/src/examples/contiguouscache.qdoc b/doc/src/examples/contiguouscache.qdoc new file mode 100644 index 0000000..fbfde3f --- /dev/null +++ b/doc/src/examples/contiguouscache.qdoc @@ -0,0 +1,97 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \example tools/contiguouscache + \title Contiguous Cache Example + + The Contiguous Cache example shows how to use QContiguousCache to manage memory usage for + very large models. In some environments memory is limited and, even when it + isn't, users still dislike an application using excessive memory. + Using QContiguousCache to manage a list, rather than loading + the entire list into memory, allows the application to limit the amount + of memory it uses, regardless of the size of the data set it accesses + + The simplest way to use QContiguousCache is to cache as items are requested. When + a view requests an item at row N it is also likely to ask for items at rows near + to N. + + \snippet examples/tools/contiguouscache/randomlistmodel.cpp 0 + + After getting the row, the class determines if the row is in the bounds + of the contiguous cache's current range. It would have been equally valid to + simply have the following code instead. + + \code + while (row > m_rows.lastIndex()) + m_rows.append(fetchWord(m_rows.lastIndex()+1); + while (row < m_rows.firstIndex()) + m_rows.prepend(fetchWord(m_rows.firstIndex()-1); + \endcode + + However a list will often jump rows if the scroll bar is used directly, resulting in + the code above causing every row between the old and new rows to be fetched. + + Using QContiguousCache::lastIndex() and QContiguousCache::firstIndex() allows + the example to determine what part of the list the cache is currently caching. + These values don't represent the indexes into the cache's own memory, but rather + a virtual infinite array that the cache represents. + + By using QContiguousCache::append() and QContiguousCache::prepend() the code ensures + that items that may be still on the screen are not lost when the requested row + has not moved far from the current cache range. QContiguousCache::insert() can + potentially remove more than one item from the cache as QContiguousCache does not + allow for gaps. If your cache needs to quickly jump back and forth between + rows with significant gaps between them consider using QCache instead. + + And thats it. A perfectly reasonable cache, using minimal memory for a very large + list. In this case the accessor for getting the words into the cache + generates random information rather than fixed information. This allows you + to see how the cache range is kept for a local number of rows when running the + example. + + \snippet examples/tools/contiguouscache/randomlistmodel.cpp 1 + + It is also worth considering pre-fetching items into the cache outside of the + application's paint routine. This can be done either with a separate thread + or using a QTimer to incrementally expand the range of the cache prior to + rows being requested out of the current cache range. +*/ diff --git a/doc/src/examples/fancybrowser.qdoc b/doc/src/examples/fancybrowser.qdoc index 9001c20..631aff9 100644 --- a/doc/src/examples/fancybrowser.qdoc +++ b/doc/src/examples/fancybrowser.qdoc @@ -40,12 +40,109 @@ ****************************************************************************/ /*! - \example webkit/fancybrowser - \title Fancy Browser Example + \example webkit/fancybrowser + \title Fancy Browser Example The Fancy Browser example shows how to use jQuery with QtWebKit to - make a web browser with some special effects and content manipulation. + create a web browser with special effects and content + manipulation. \image fancybrowser-example.png + The application makes use of QWebFrame::evaluateJavaScript to + evaluate the jQuery JavaScript code. A QMainWindow with a QWebView + as central widget builds up the browser itself. + + \section1 MainWindow Class Definition + + The \c MainWindow class inherits QMainWindow. It implements a number of + slots to perform actions on both the application and on the web content. + + \snippet examples/webkit/fancybrowser/mainwindow.h 1 + + We also declare a QString that contains the jQuery, a QWebView + that displays the web content, and a QLineEdit that acts as the + address bar. + + \section1 MainWindow Class Implementation + + We start by implementing the constructor. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 1 + + The first part of the constructor sets the value of \c progress to + 0. This value will be used later in the code to visualize the + loading of a webpage. + + Next, the jQuery library is loaded using a QFile and reading the file + content. The jQuery library is a JavaScript library that provides different + functions for manipulating HTML. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 2 + + The second part of the constructor creates a QWebView and connects + slots to the views signals. Furthermore, we create a QLineEdit as + the browsers address bar. We then set the horizontal QSizePolicy + to fill the available area in the browser at all times. We add the + QLineEdit to a QToolbar together with a set of navigation actions + from QWebView::pageAction. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 3 + + The third and last part of the constructor implements two QMenus and assigns + a set of actions to them. The last line sets the QWebView as the central + widget in the QMainWindow. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 4 + + When the page is loaded, \c adjustLocation() updates the address + bar; \c adjustLocation() is triggered by the \c loadFinished() + signal in QWebView. In \c changeLocation() we create a QUrl + object, and then use it to load the page into the QWebView. When + the new web page has finished loading, \c adjustLocation() will be + run once more to update the address bar. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 5 + + \c adjustTitle() sets the window title and displays the loading + progress. This slot is triggered by the \c titleChanged() signal + in QWebView. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 6 + + When a web page has loaded, \c finishLoading() is triggered by the + \c loadFinished() signal in QWebView. \c finishLoading() then updates the + progress in the title bar and calls \c evaluateJavaScript() to evaluate the + jQuery library. This evaluates the JavaScript against the current web page. + What that means is that the JavaScript can be viewed as part of the content + loaded into the QWebView, and therefore needs to be loaded every time a new + page is loaded. Once the jQuery library is loaded, we can start executing + the different jQuery functions in the browser. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 7 + + The first jQuery-based function, \c highlightAllLinks(), is designed to + highlight all links in the current webpage. The JavaScript code looks + for web elements named \e {a}, which is the tag for a hyperlink. + For each such element, the background color is set to be yellow by + using CSS. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 8 + + The \c rotateImages() function rotates the images on the current + web page. Webkit supports CSS transforms and this JavaScript code + looks up all \e {img} elements and rotates the images 180 degrees + and then back again. + + \snippet examples/webkit/fancybrowser/mainwindow.cpp 9 + + The remaining four methods remove different elements from the current web + page. \c removeGifImages() removes all Gif images on the page by looking up + the \e {src} attribute of all the elements on the web page. Any element with + a \e {gif} file as its source is removed. \c removeInlineFrames() removes all + \e {iframe} or inline elements. \c removeObjectElements() removes all + \e {object} elements, and \c removeEmbeddedElements() removes any elements + such as plugins embedded on the page using the \e {embed} tag. + */ + diff --git a/doc/src/qnamespace.qdoc b/doc/src/qnamespace.qdoc index ad59b8d..fc4310b 100644 --- a/doc/src/qnamespace.qdoc +++ b/doc/src/qnamespace.qdoc @@ -157,6 +157,14 @@ set to true won't be used as a native menubar (e.g, the menubar at the top of the main screen on Mac OS X or at the bottom in Windows CE). + \value AA_MacDontSwapCtrlAndMeta On Mac OS X by default, Qt swaps the + Control and Meta (Command) keys (i.e., whenever Control is pressed, Qt + sends Meta and whenever Meta is pressed Control is sent. When this + attribute is true, Qt will not do the flip. QKeySequence::StandardShortcuts + will also flip accordingly (i.e., QKeySequence::Copy will be + Command+C on the keyboard regardless of the value set, though what is output for + QKeySequence::toString(QKeySequence::PortableText) will be different). + \omitvalue AA_AttributeCount */ diff --git a/doc/src/qset.qdoc b/doc/src/qset.qdoc index 9795123..2d12661 100644 --- a/doc/src/qset.qdoc +++ b/doc/src/qset.qdoc @@ -447,7 +447,7 @@ \fn QSet::const_iterator QSet::insert(const T &value) Inserts item \a value into the set, if \a value isn't already - in the set, and returns an iterator positioned at the inserted + in the set, and returns an iterator pointing at the inserted item. \sa operator<<(), remove(), contains() diff --git a/doc/src/snippets/sqldatabase/sqldatabase.cpp b/doc/src/snippets/sqldatabase/sqldatabase.cpp index ae176ac..06afa0c 100644 --- a/doc/src/snippets/sqldatabase/sqldatabase.cpp +++ b/doc/src/snippets/sqldatabase/sqldatabase.cpp @@ -524,7 +524,7 @@ protected: bool fetchLast() { return false; } int size() { return 0; } int numRowsAffected() { return 0; } - QSqlRecord record() { return QSqlRecord(); } + QSqlRecord record() const { return QSqlRecord(); } }; //! 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