Download C++ GUI programming with Qt3 by Jasmin Blanchette; Mark Summerfield PDF

By Jasmin Blanchette; Mark Summerfield

Many businesses are dealing with issues of home windows improvement utilizing conventional home windows instruments akin to visible Studio. once they write functions, even simply "single platform" functions for home windows, they typically need to account for changes among diversified home windows models, which provides difficulty to improvement and upkeep. Qt works irrespective of the home windows models. This booklet offers the entire details had to turn into a qualified Qt developer. The ebook additionally covers go platform GUI programming--programmers should be engaged on home windows, Linux, or Mac and the ebook will paintings for them. this is often invaluable for advertisement businesses that use Qt, and for firms which are comparing Qt. it is going to even be invaluable to the immense variety of open resource builders who already use Qt due to the fact that no different booklet of similar caliber or comprehensiveness is out there. This publication teaches Qt's idioms and the way to exploit Qt to most sensible virtue. The e-book is prepared into 4 elements. the 1st half introduces the C++ useful for the powerful use of Qt. the second one half covers uncomplicated Qt, beginning with a few very brief examples, and speedy build up to an entire Graphical person Interface application. the second one half presents assurance of key Qt gains together with signs. The 3rd and fourth elements conceal extra complicated and really good fabric

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16. 16. Naming the form’s widgets Finally, set up the connections: 1. Connect the okButton’s clicked() signal to the form’s accept() slot. 2. Connect the cancelButton’s clicked() signal to the form’s reject() slot. 3. Connect the moreButton’s toggled(bool) signal to the secondaryGroupBox’s setShown(bool) slot. 4. Connect the moreButton’s toggled(bool) signal to the tertiaryGroupBox’s setShown(bool) slot. Double-click the form to launch Qt Designer’s C++ code editor and type in the following code: 001 002 003 004 005 006 void SortDialog::init() { secondaryGroupBox->hide(); tertiaryGroupBox->hide(); setColumnRange(’A’, ’Z’); } 007 008 009 010 011 void SortDialog::setColumnRange(QChar first, QChar last) { primaryColumnCombo->clear(); secondaryColumnCombo->clear(); tertiaryColumnCombo->clear(); 012 013 secondaryColumnCombo->insertItem(tr("None")); tertiaryColumnCombo->insertItem(tr("None")); 014 015 primaryColumnCombo->setMinimumSize( secondaryColumnCombo->sizeHint()); 32 016 017 018 019 020 021 022 023 2.

16. 16. Naming the form’s widgets Finally, set up the connections: 1. Connect the okButton’s clicked() signal to the form’s accept() slot. 2. Connect the cancelButton’s clicked() signal to the form’s reject() slot. 3. Connect the moreButton’s toggled(bool) signal to the secondaryGroupBox’s setShown(bool) slot. 4. Connect the moreButton’s toggled(bool) signal to the tertiaryGroupBox’s setShown(bool) slot. Double-click the form to launch Qt Designer’s C++ code editor and type in the following code: 001 002 003 004 005 006 void SortDialog::init() { secondaryGroupBox->hide(); tertiaryGroupBox->hide(); setColumnRange(’A’, ’Z’); } 007 008 009 010 011 void SortDialog::setColumnRange(QChar first, QChar last) { primaryColumnCombo->clear(); secondaryColumnCombo->clear(); tertiaryColumnCombo->clear(); 012 013 secondaryColumnCombo->insertItem(tr("None")); tertiaryColumnCombo->insertItem(tr("None")); 014 015 primaryColumnCombo->setMinimumSize( secondaryColumnCombo->sizeHint()); 32 016 017 018 019 020 021 022 023 2.

This almost completes the implementation of the File menu. There is one function and one supporting slot that we have not implemented yet. Both are concerned with managing the recently opened files list. 11. arg(strippedName(recentFiles[i])); if (recentFileIds[i] == -1) { if (i == 0) fileMenu->insertSeparator(fileMenu->count() - 2); recentFileIds[i] = fileMenu->insertItem(text, this, Implementing the File Menu 55 SLOT(openRecentFile(int)), 0, -1, fileMenu->count() - 2); fileMenu->setItemParameter(recentFileIds[i], i); } else { fileMenu->changeItem(recentFileIds[i], text); } } } The updateRecentFileItems() private function is called to update the recently opened files menu items.

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