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 ebook is aimed toward latest C++/Qt programmers and provides principles and strategies which are too complicated or really good (although no longer unavoidably difficult), for a primary publication on Qt.

Qt has now grown to over seven hundred periods and good over one million phrases of documentation, some distance an excessive amount of to hide in one quantity. So rather than masking every little thing very thinly, the ebook specializes in key components of Qt expertise and attempts to supply extra complete assurance than is accessible elsewhere.

The publication is totally useful in emphasis, with each procedure illustrated by means of operating code. The examples convey 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 may be downloaded from the book's online page. Amazon do not permit 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 though many different issues are coated. along with each one chapter's major topic, plenty of different sessions, tools, and methods are used anyplace they make feel, to teach as many Qt gains as attainable. So even the main skilled Qt programmer should still notice features of Qt they were not conscious of, become aware of new innovations, and be encouraged with new principles.

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This reusability is lucky due to the fact that because the clue of the littering of Q_ASSERTs may point out, even supposing many of the equipment glance deceptively easy, they are often fairly tough to get correct. equipment for Saving and Loading Tree goods || during this subsubsection we'll examine the tools had to aid the saving and loading of tree goods to and from files, together with the equipment for dealing with job paths. even supposing the timelog2 software has extra performance than timelog1 (in specific aid for drag and drop, replica and paste, and relocating items), we now have used a similar XML file structure for either (143 ➤) so their files are thoroughly interchangeable. void TreeModel::clear() { delete rootItem; rootItem = zero; delete cutItem; cutItem = zero; timedItem = zero; Creating customized Tree types 181 reset(); } this technique is required to help the fileNewAction. We needs to delete the basis merchandise and the minimize merchandise considering the fact that we personal those; however the timed merchandise is an merchandise within the tree so the basis already owns it. (We won’t say extra concerning the timed merchandise when you consider that its merely significance is to do with timing a task—it has no significance within the context of the model/view programming we're contemplating right here. ) on the finish we name QAbstractItemModel::reset() to inform any linked perspectives that the model’s information has replaced appreciably so that they needs to re-request any goods that they need to teach. void TreeModel::save(const QString &filename) { ··· QXmlStreamWriter writer(&file); author. setAutoFormatting(true); author. writeStartDocument(); author. writeStartElement("TIMELOG"); author. writeAttribute("VERSION", "2. 0"); writeTaskAndChildren(&writer, rootItem); author. writeEndElement(); // TIMELOG author. writeEndDocument(); } this system begins out within the similar approach because the StandardTreeModel::save() method—so we now have passed over that a part of the code—using the present filename or the single handed in as applicable, and elevating an exception if the file couldn’t be opened (144 ➤). all of the paintings is completed by way of the writeTaskAndChildren() technique that we observed past once we checked out enforcing drag and drop and had to serialize an merchandise and its childrens in XML structure (170 ➤). void TreeModel::load(const QString &filename) { ··· clear(); rootItem = new TaskItem; QXmlStreamReader reader(&file); readTasks(&reader, rootItem); if (reader. hasError()) throw AQP::Error(reader. errorString()); reset(); } this technique begins in a similar fashion to the save() technique relating to filename dealing with and elevating an exception if the file couldn’t be opened, so once more we've got passed over the code. After clearing the present initiatives a brand new root merchandise 182 bankruptcy four. Model/View Tree types is created and the readTasks() strategy is used to populate the tree with the given root merchandise and skim its info from the given QXmlStreamReader. this is often a similar readTasks() process we used past to recreate dropped information below a specific father or mother merchandise within the tree (173 ➤). QStringList TreeModel::pathForIndex(const QModelIndex &index) const { QStringList direction; QModelIndex thisIndex = index; whereas (thisIndex.

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