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Advanced Qt Programming: Creating Great Software with C++ by Mark Summerfield

Posted On March 23, 2017 at 6:06 am by / Comments Off on Advanced Qt Programming: Creating Great Software with C++ by Mark Summerfield

By Mark Summerfield

This ebook is geared toward present C++/Qt programmers and offers principles and options which are too complicated or really expert (although now not unavoidably difficult), for a primary e-book on Qt.

Qt has now grown to over seven-hundred sessions and good over one million phrases of documentation, some distance an excessive amount of to hide in one quantity. So rather than overlaying every thing very thinly, the e-book makes a speciality of key components of Qt know-how and attempts to supply extra finished insurance than is on hand elsewhere.

The ebook is totally sensible in emphasis, with each procedure illustrated via operating code. The examples exhibit Qt most sensible practices, and feature been proven on Linux, Mac OS X, and home windows, utilizing Qt 4.6 and the place attainable (e.g., utilizing #if QT_VERSION), Qt 4.5. (The examples and a pattern bankruptcy will be downloaded from the book's online page. Amazon don't enable URLs so google for "qtrac" to discover it.)

The book's major issues are hybrid desktop/Internet purposes, threading, wealthy textual content dealing with, Qt's graphics/view structure, and Qt's model/view structure (to which 4 chapters are devoted), even if many different subject matters are lined. along with each one chapter's major topic, plenty of different periods, equipment, and strategies are used anywhere they make experience, to teach as many Qt gains as attainable. So even the main skilled Qt programmer should still realize facets of Qt they weren't conscious of, observe new ideas, and be encouraged with new ideas.</i>

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If the user has chosen the first item in the issue combobox (the “no issue selected” item), we do nothing. toString(); browser->load(url); browser->setFocus(); } When the user chooses a new item in the article combobox (apart from the first “no article selected” item), we retrieve the URL that is associated with the article title from the combobox item’s data, and tell the browser window to load the corresponding page. We also give the browser window focus (which actually goes to the browser window’s QWebView), so that the user can immediately begin scrolling with the keyboard up and down arrow keys.

ToPlainText(); #endif setToolTip(toolTipText); } Unfortunately, Qt rich text (HTML) tray icon tooltips are only supported on X11, so for Windows and Mac OS X systems we convert the HTML tooltip text to plain text. We do this by using the static QTextDocumentFragment::fromHtml() method to get a QTextDocumentFragment, and then using QTextDocumentFragment:: 18 Chapter 1. Hybrid Desktop/Internet Applications toPlainText(), to produce plain text. Using a QTextDocumentFragment is more convenient than doing the conversion by hand since not only does it convert HTML entities to the appropriate Unicode characters and strip out HTML tags, but it is also smart enough to convert
s into newlines.

Mid(1, 4)); networkXmlAccess->get(QNetworkRequest(QUrl(url))); } } The XML weather data for a given airport is in a file whose name matches the airport’s four letter code. We have included this code in parentheses at the end of each airport’s name, and use basic QString methods to extract it. Once we have the URL we need we use the XML network access manager to do a GET request on it. When a request is made a pointer to the QNetworkReply object that will receive the results is returned. These objects emit signals indicating progress, for example, downloadProgress() and uploadProgress(), and when the request finishes, the reply object issues a finished() signal.

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