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 latest C++/Qt programmers and provides principles and strategies which are too complicated or really good (although now not unavoidably difficult), for a primary booklet 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 booklet makes a speciality of key parts of Qt know-how and attempts to supply extra finished assurance than is on the market elsewhere.

The ebook is totally useful in emphasis, with each process illustrated via operating code. The examples convey Qt top 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 should be downloaded from the book's website. Amazon do not enable 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 if many different issues are coated. in addition to each one chapter's major topic, plenty of different sessions, equipment, and strategies are used at any place they make experience, to teach as many Qt gains as attainable. So even the main skilled Qt programmer may still realize features of Qt they were not conscious of, notice 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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Textual content = "&Submit"; resultLabel. textual content = "Enter the reply and click on Submit"; repopulateMatrices(); newButton. clicked. connect(repopulateMatrices); submitButton. clicked. connect(checkAnswer); nameEdit. setFocus(); JavaScript One attention-grabbing distinction from C++/Qt is that during JavaScript and QtScript, signal–slot connections are arrange utilizing this type of syntaxes: item. signalName. connect(functionName) item. signalName. connect(otherObject. methodName) JavaScript We won’t exhibit the repopulateMatrices() functionality given that all it does is name repopulateMatrix() on all of the MatrixWidgets, yet for completeness we'll convey the checkAnswer() functionality. functionality checkAnswer() { var allCorrect = real; for (var row = zero; row < leftMatrix. rowCount; ++row) { for (var column = zero; column < leftMatrix. columnCount; ++column) { var spotlight = fake; if (Number(leftMatrix. valueAt(row, column)) + Number(rightMatrix. valueAt(row, column)) ! = Number(answerMatrix. valueAt(row, column))) { spotlight = real; allCorrect = fake; } answerMatrix. setHighlighted(row, column, highlight); } } identify = nameEdit. textual content == "" ? "mystery individual" : nameEdit. textual content; if (allCorrect) resultLabel. textual content = "Yes, " + identify + ", that is correct! "; else resultLabel. textual content = "No, " + identify + ", that isn't correct. "; } This functionality iterates over each telephone within the 3 matrices. If the reply matrix cell’s worth is true we transparent its highlighting (i. e. , set its historical past to JavaScript 52 bankruptcy 1. Hybrid Desktop/Internet functions white), another way we set its highlighting (i. e. , set its heritage to red). If a number of values are wrong we set allCorrect to fake. on the finish we retrieve the user’s identify from the nameEdit QLineEdit and set the resultLabel QLabel with appropriate textual content in line with even if the consumer bought the reply correct or no longer. we've accomplished our assessment of the Matrix Quiz online page and the C++/Qt and JavaScript used to supply it with its visual appeal and behaviour. Embedding Qt widgets right into a website bargains a strong and complex means of bettering an internet page’s performance, however it does depend on the consumer having a Qt-enabled net browser or utilizing an program that offers a Qt-enabled internet browser part corresponding to the browserwindow built during this bankruptcy. there are numerous other ways of constructing hybrid desktop/Internet purposes, with quite a few trade-offs among them. those offerings have been more advantageous by means of Qt four. four, which brought the QtXmlPatterns module that helps XQueries and the XPath language. And the alternatives were extra stronger by way of Qt four. 6, which has brought the QGraphicsWebView type (a QGraphicsItem model of the QWebView widget that's optimized for being proven in a QGraphicsView), and the QWebElement category that offers a pleasant jQuery-like API for gaining access to and modifying a QWebFrame’s DOM components. Qt permits us to decide on whichever method is true in our specific conditions this means that we don’t need to sacrifice usability, performance, or local feel and appear for the sake of delivering net performance in our purposes.

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