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authorNico Vertriest <nico.vertriest@digia.com>2013-03-05 12:37:37 +0100
committerThe Qt Project <gerrit-noreply@qt-project.org>2013-03-05 17:55:14 +0100
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Doc: fixed snippet issues with customcompleter.qdoc
Edited customcompleter.qdoc (paths snippets + ingroup statement) Moved customcompleter.qdoc to widgets/tools/customcompleter/doc/src Moved png files to doc/qtwidgets/images Task-number: QTBUG-29101 Change-Id: Iab66f178b92321257c4eb0e4e9704bb1e3043ef6 Reviewed-by: Jerome Pasion <jerome.pasion@digia.com> Reviewed-by: Laszlo Papp <lpapp@kde.org>
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-/****************************************************************************
-**
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/legal
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:FDL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Digia. For licensing terms and
-** conditions see http://qt.digia.com/licensing. For further information
-** use the contact form at http://qt.digia.com/contact-us.
-**
-** GNU Free Documentation License Usage
-** Alternatively, this file may be used under the terms of the GNU Free
-** Documentation License version 1.3 as published by the Free Software
-** Foundation and appearing in the file included in the packaging of
-** this file. Please review the following information to ensure
-** the GNU Free Documentation License version 1.3 requirements
-** will be met: http://www.gnu.org/copyleft/fdl.html.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
- \example customcompleter
- \title Custom Completer Example
-
- \brief The Custom Completer example shows how to provide string-completion
- facilities for an input widget based on data provided by a model. The
- completer pops up suggestions for possible words based on the first three
- characters input by the user and the user's choice of word is inserted
- into the \c TextEdit using QTextCursor.
-
- \image customcompleter-example.png
-
- \section1 Setting Up The Resource File
-
- The Custom Completer example requires a resource file, \e wordlist.txt,
- that has a list of words to help QCompleter complete words. This file
- contains the following:
-
- \quotefile customcompleter/customcompleter.qrc
-
- \section1 TextEdit Class Definition
-
- The \c TextEdit class is a subclass of QTextEdit with a custom
- \c insertCompletion() slot and it reimplements the
- \l{QAbstractScrollArea::keyPressEvent()}{keyPressEvent()} and the
- \l{QWidget::focusInEvent()}{focusInEvent()} functions. \c TextEdit also
- contains a private function \c textUnderCursor() and a private instance
- of QCompleter, \c c.
-
- \snippet customcompleter/textedit.h 0
-
- \section1 TextEdit Class Implementation
-
- The constructor for \c TextEdit constructs a \c TextEdit with a parent and
- initializes \c c. The instructions to use the completer is displayed on
- the \c TextEdit object, using the
- \l{QTextEdit::setPlainText()}{setPlainText()} function.
-
- \snippet customcompleter/textedit.cpp 0
-
- In addition, \c TextEdit also includes a default destructor:
-
- \snippet customcompleter/textedit.cpp 1
-
- The \c setCompleter() function accepts a \a completer and sets it up.
- We use \c{if (c)} to check if \c c has been initialized. If it has been
- initialized, the QObject::disconnect() function is invoked to disconnect
- the signal from the slot. This is to ensure that no previous completer
- object is still connected to the slot.
-
- \snippet customcompleter/textedit.cpp 2
-
- We then instantiate \c c with \a completer and set it as \c{TextEdit}'s
- widget. The completion mode and case sensitivity are also set and then
- we connect the \l{QCompleter::activated()}{activated()} signal to the
- \c insertCompletion() slot.
-
- The \c completer() function is a getter function that returns \c c.
-
- \snippet customcompleter/textedit.cpp 3
-
- The completer pops up the options available, based on the contents of
- \e wordlist.txt, but the text cursor is responsible for filling in the
- missing characters, according to the user's choice of word.
-
- Suppose the user inputs "ACT" and accepts the completer's suggestion of
- "ACTUAL". The \c completion string is then sent to \c insertCompletion()
- by the completer's \l{QCompleter::activated()}{activated()} signal.
-
- The \c insertCompletion() function is responsible for completing the word
- using a QTextCursor object, \c tc. It validates to ensure that the
- completer's widget is \c TextEdit before using \c tc to insert the extra
- characters to complete the word.
-
- \snippet customcompleter/textedit.cpp 4
-
- The figure below illustrates this process:
-
- \image customcompleter-insertcompletion.png
-
- \c{completion.length()} = 6
-
- \c{c->completionPrefix().length()}=3
-
- The difference between these two values is \c extra, which is 3. This
- means that the last three characters from the right, "U", "A", and "L",
- will be inserted by \c tc.
-
- The \c textUnderCursor() function uses a QTextCursor, \c tc, to select a
- word under the cursor and return it.
-
- \snippet customcompleter/textedit.cpp 5
-
- The \c TextEdit class reimplements \l{QWidget::focusInEvent()}
- {focusInEvent()} function, which is an event handler used to receive
- keyboard focus events for the widget.
-
- \snippet customcompleter/textedit.cpp 6
-
- The \l{QAbstractScrollArea::keyPressEvent()}{keyPressEvent()} is
- reimplemented to ignore key events like Qt::Key_Enter, Qt::Key_Return,
- Qt::Key_Escape, Qt::Key_Tab, and Qt::Key_Backtab so the completer can
- handle them.
-
- If there is an active completer, we cannot process the shortcut, Ctrl+E.
-
- \snippet customcompleter/textedit.cpp 7
-
- We also handle other modifiers and shortcuts for which we do not want the
- completer to respond to.
-
- \snippet customcompleter/textedit.cpp 8
-
- Finally, we pop up the completer.
-
- \section1 MainWindow Class Definition
-
- The \c MainWindow class is a subclass of QMainWindow and implements a
- private slot, \c about(). This class also has two private functions,
- \c createMenu() and \c modelFromFile() as well as private instances of
- QCompleter and \c TextEdit.
-
- \snippet customcompleter/mainwindow.h 0
-
- \section1 MainWindow Class Implementation
-
- The constructor constructs a \c MainWindow with a parent and initializes
- the \c completer. It also instantiates a \c TextEdit and sets its
- completer. A QStringListModel, obtained from \c modelFromFile(), is used
- to populate the \c completer. The \c{MainWindow}'s central widget is set
- to \c TextEdit and its size is set to 500 x 300.
-
- \snippet customcompleter/mainwindow.cpp 0
-
- The \c createMenu() function creates the necessary QAction objects needed
- for the "File" and "Help" menu and their \l{QAction::triggered()}
- {triggered()} signals are connected to the \c quit(), \c about(), and
- \c aboutQt() slots respectively.
-
- \snippet customcompleter/mainwindow.cpp 1
-
- The \c modelFromFile() function accepts a \a fileName and attempts to
- extract the contents of this file into a QStringListModel. We display the
- Qt::WaitCursor when we are populating the QStringList, \c words, and
- restore the mouse cursor when we are done.
-
- \snippet customcompleter/mainwindow.cpp 2
-
- The \c about() function provides a brief description about the Custom
- Completer example.
-
- \snippet customcompleter/mainwindow.cpp 3
-
- \section1 \c main() Function
-
- The \c main() function instantiates \c MainWindow and invokes the
- \l{QWidget::show()}{show()} function.
-
- \snippet customcompleter/main.cpp 0
-*/