Download E-books Advanced Qt Programming: Creating Great Software with C++ and Qt 4 (Prentice Hall Open Source Software Development) PDF

By Mark Summerfield

This booklet is geared toward present C++/Qt programmers and provides rules and strategies which are too complicated 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 one million phrases of documentation, a ways an excessive amount of to hide in one quantity. So rather than overlaying every thing very thinly, the ebook makes a speciality of key parts of Qt know-how and attempts to supply extra accomplished insurance than is on the market elsewhere.

The booklet is totally useful in emphasis, with each process illustrated by means 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 could be downloaded from the book's website. Amazon do not enable URLs so google for "qtrac" to discover it.)

The book's major topics are hybrid desktop/Internet functions, threading, wealthy textual content dealing with, Qt's graphics/view structure, and Qt's model/view structure (to which 4 chapters are devoted), even supposing many different issues are coated. in addition to each one chapter's major topic, plenty of different periods, tools, and strategies are used at any place they make feel, to teach as many Qt good points as attainable. So even the main skilled Qt programmer may still notice points of Qt they were not conscious of, detect new concepts, and be encouraged with new rules.

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

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Tr("Time (Today)") << tr("Time (Total)")); for (int column = 1; column < columnCount(); ++column) horizontalHeaderItem(column)->setTextAlignment( Qt::AlignVCenter|Qt::AlignRight); } We separated the initialization into its personal procedure when you consider that we have to name it from assorted areas. void StandardTreeModel::clear() { QStandardItemModel::clear(); initialize(); } the bottom type clear() approach not just eliminates the entire model’s goods, but in addition its headers. So after clearing we recreate the headers via calling initialize(). void StandardTreeModel::save(const QString &filename) { if (! filename. isEmpty()) m_filename = filename; if (m_filename. isEmpty()) throw AQP::Error(tr("no filename specified")); QFile file(m_filename); if (! dossier. open(QIODevice::WriteOnly|QIODevice::Text)) throw AQP::Error(file. errorString()); QXmlStreamWriter writer(&file); author. setAutoFormatting(true); author. writeStartDocument(); author. writeStartElement("TIMELOG"); author. writeAttribute("VERSION", "2. 0"); writeTaskAndChildren(&writer, invisibleRootItem()); author. writeEndElement(); // TIMELOG author. writeEndDocument(); } the tactic starts off with code like that utilized in the Zipcodes examples, utilizing a brand new filename if given or the prevailing filename another way. The caller is anticipated to capture and deal with any exceptions. The AQP::Error classification is similar one we observed sooner than (105 ➤). utilizing QStandardItemModels for timber a hundred forty five The QXmlStreamWriter category is in a position to writing what we'd like with out being subclassed. If the autoFormatting estate is right, the XML is written out in a human-friendly layout with indentation and newlines; differently it truly is written in as compact a structure as attainable with none pointless whitespace. The writeStartDocument() name writes the road at the start of the file—of path, the encoding characteristic (and the encoding used)—will be various if we name QXmlStreamWriter::setCodec() to impose our personal number of encoding. we've got enclosed the hierarchy of activity tags within a TIMELOG tag (not proven) and given this tag a model characteristic to assist you to swap the file layout sooner or later. The QXmlStreamWriter::writeAttribute() procedure takes an characteristic identify and a value—there is not any desire for us to do any XML escaping because the QXmlStreamWriter handles that instantly. We then name the writeTaskAndChildren() strategy to write the entire initiatives. const const const const const const QString QString QString QString QString QString TaskTag("TASK"); NameAttribute("NAME"); DoneAttribute("DONE"); WhenTag("WHEN"); StartAttribute("START"); EndAttribute("END"); void StandardTreeModel::writeTaskAndChildren(QXmlStreamWriter *writer, QStandardItem *root) { if (root ! = invisibleRootItem()) { StandardItem *item = static_cast(root); writer->writeStartElement(TaskTag); writer->writeAttribute(NameAttribute, item->text()); writer->writeAttribute(DoneAttribute, item->checkState() == Qt::Checked ? "1" : "0"); QListIterator< QPair > i(item->dateTimes()); whereas (i.

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