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

By Mark Summerfield

This e-book is aimed toward latest C++/Qt programmers and provides principles and recommendations which are too complex or really good (although now not unavoidably difficult), for a primary publication on Qt.

Qt has now grown to over seven hundred sessions and good over one million phrases of documentation, a long way an excessive amount of to hide in one quantity. So rather than protecting every little thing very thinly, the booklet specializes in key parts of Qt expertise and attempts to supply extra accomplished assurance than is to be had elsewhere.

The publication is totally functional in emphasis, with each method illustrated by way of operating code. The examples exhibit Qt most sensible practices, and feature been demonstrated 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 web content. Amazon don't permit URLs so google for "qtrac" to discover it.)

The book's major topics 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 though many different themes are coated. along with every one chapter's major topic, plenty of different sessions, tools, and methods are used anyplace they make experience, to teach as many Qt gains as attainable. So even the main skilled Qt programmer may still notice features of Qt they weren't conscious of, realize new recommendations, and be encouraged with new ideas.</i>

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Extra info for Advanced Qt Programming: Creating Great Software with C++ and Qt 4 (Prentice Hall Open Source Software Development Series)

Example text

The AQP::accelerateWidget() function uses QObject::findChildren() to find all the QLabels and QAbstractButtons (and their subclasses, apart from QToolButtons) that are children of the window and sets keyboard accelerators for them (15 ➤). One novel aspect of the constructor is the creation of the two LinkFetcher objects. These objects create QWebPage objects behind the scenes—recall that QWebPages are data objects—and have their QWebPages download a specified page. They then inject the JavaScript they are given when they are constructed into the page, and this is used to extract relevant links.

If we retrieved a QIcon pointer from the cache we use it—in fact we get a copy (which is cheap because Qt uses copy-on-write, and useful since QCache can delete items at any time). Otherwise we use the icon network access manager to download the icon. And if we initiate downloading an icon, the signal–slot connection set up earlier will ensure that the readIcon() slot (covered shortly) is called when the download has finished. 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 populate the combobox using the populateAComboBox() method shown earlier (35 ➤), passing it a status text to add as the first item, the current issue’s URL–article name map from the cache, and the combobox we want populated. 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.

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