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

By Mark Summerfield

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

Qt has now grown to over seven-hundred sessions and good over 1000000 phrases of documentation, a ways an excessive amount of to hide in one quantity. So rather than protecting every thing very thinly, the booklet specializes in key components of Qt know-how and attempts to supply extra entire insurance than is out there elsewhere.

The ebook is totally functional in emphasis, with each method illustrated via operating code. The examples express Qt most sensible practices, and feature been confirmed 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 do not permit URLs so google for "qtrac" to discover it.)

The book's major subject matters 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 issues are coated. in addition to every one chapter's major topic, plenty of different sessions, tools, and strategies are used anywhere they make feel, to teach as many Qt positive aspects as attainable. So even the main skilled Qt programmer may still notice facets of Qt they were not conscious of, observe new recommendations, and be encouraged with new rules.

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The single procedure we are going to hide is the undefined; the opposite non-inline equipment are used to increment the time if the duty is being timed and to calculate the days and go back them in string or date/time shape, in order that they aren't correct to model/view programming—although they're within the book’s resource code. StandardItem::StandardItem(const QString &text, bool performed) : QStandardItem(text) { setCheckable(true); setCheckState(done ? Qt::Checked : Qt::Unchecked); setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled| Qt::ItemIsEditable|Qt::ItemIsUserCheckable); m_today = new QStandardItem; m_today->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled); m_today->setTextAlignment(Qt::AlignVCenter|Qt::AlignRight); m_total = new QStandardItem; m_total->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled); m_total->setTextAlignment(Qt::AlignVCenter|Qt::AlignRight); } We make the duty merchandise checkable (to reflect the “done” flag), and make it enabled, selectable, editable, and user-checkable in order that the person can money and uncheck the task—typically by way of clicking it or by means of urgent the spacebar whilst the duty is chosen. within the StandardTreeModel subclass we basically ever create StandardItems, one for every job. every one of those in flip creates the QStandardItems used for the task’s occasions. For the time goods we purely let them be selectable and enabled because we don’t wish the consumer on the way to edit them and we don’t wish them to have checkboxes. Now that we all know what facts a StandardItem holds and the equipment it offers, we're able to examine the StandardTreeModel that holds all the projects. utilizing QStandardItemModels for bushes 143 A QStandardItemModel Subclass for bushes ||| The StandardTreeModel is a QStandardItemModel subclass used to symbolize a tree of initiatives. as well as supplying file handling—load() and save()—the classification offers the insertNewTask() technique for including a brand new job as we observed within the MainWindow::editAdd() procedure (139 ➤). It additionally has the pathForIndex() and itemForPath() equipment for dealing with activity paths that we mentioned prior (134 ➤; 136 ➤), which we are going to conceal during this subsection. The class’s merely customized inner most info is a filename of kind QString. The application’s information is held in an XML file layout on disk. An extract from this sort of file is proven in determine four. 2. ... determine four. 2 An extract from a Timelog info file each one task’s identify and performed prestige is saved in a job tag’s attributes. activity names can include HTML markup, and this markup needs to be adequately escaped in order that it doesn’t conflict with the XML markup used to shop the knowledge.

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