From 806dda08d685bc5f9ed71dfe8b61f21848d48066 Mon Sep 17 00:00:00 2001 From: Gabriel de Dietrich Date: Fri, 17 Aug 2012 13:23:19 +0200 Subject: Moving .qdoc files under examples/widgets/doc Updated those .qdoc files to refer to the new relative examples emplacement. Images and snippets to be moved later. Also grouped all widgets related examples under widgets. Change-Id: Ib29696e2d8948524537f53e8dda88f9ee26a597f Reviewed-by: J-P Nurmi --- examples/widgets/doc/simplewidgetmapper.qdoc | 125 +++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) create mode 100644 examples/widgets/doc/simplewidgetmapper.qdoc (limited to 'examples/widgets/doc/simplewidgetmapper.qdoc') diff --git a/examples/widgets/doc/simplewidgetmapper.qdoc b/examples/widgets/doc/simplewidgetmapper.qdoc new file mode 100644 index 0000000000..2b7cd2d79a --- /dev/null +++ b/examples/widgets/doc/simplewidgetmapper.qdoc @@ -0,0 +1,125 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:FDL$ +** GNU Free Documentation License +** 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms +** and conditions contained in a signed written agreement between you +** and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \example itemviews/simplewidgetmapper + \title Simple Widget Mapper Example + + The Simple Widget Mapper example shows how to use a widget mapper to display + data from a model in a collection of widgets. + + \image simplewidgetmapper-example.png + + The QDataWidgetMapper class allows information obtained from a + \l{Model Classes}{model} to be viewed and edited in a collection of + widgets instead of in an \l{View Classes}{item view}. + Any model derived from QAbstractItemModel can be used as the source of + data and almost any input widget can be used to display it. + + The example itself is very simple: we create \c Window, a QWidget subclass + that we use to hold the widgets used to present the data, and show it. The + \c Window class will provide buttons that the user can click to show + different records from the model. + + \section1 Window Class Definition + + The class provides a constructor, a slot to keep the buttons up to date, + and a private function to set up the model: + + \snippet itemviews/simplewidgetmapper/window.h Window definition + + In addition to the QDataWidgetMapper object and the controls used to make + up the user interface, we use a QStandardItemModel to hold our data. + We could use a custom model, but this standard implementation is sufficient + for our purposes. + + \section1 Window Class Implementation + + The constructor of the \c Window class can be explained in three parts. + In the first part, we set up the widgets used for the user interface: + + \snippet itemviews/simplewidgetmapper/window.cpp Set up widgets + + We also set up the buddy relationships between various labels and the + corresponding input widgets. + + Next, we set up the widget mapper, relating each input widget to a column + in the model specified by the call to \l{QDataWidgetMapper::}{setModel()}: + + \snippet itemviews/simplewidgetmapper/window.cpp Set up the mapper + + We also connect the mapper to the \uicontrol{Next} and \uicontrol{Previous} buttons + via its \l{QDataWidgetMapper::}{toNext()} and + \l{QDataWidgetMapper::}{toPrevious()} slots. The mapper's + \l{QDataWidgetMapper::}{currentIndexChanged()} signal is connected to the + \c{updateButtons()} slot in the window which we'll show later. + + In the final part of the constructor, we set up the layout, placing each + of the widgets in a grid (we could also use a QFormLayout for this): + + \snippet itemviews/simplewidgetmapper/window.cpp Set up the layout + + Lastly, we set the window title and initialize the mapper by setting it to + refer to the first row in the model. + + The model is initialized in the window's \c{setupModel()} function. Here, + we create a standard model with 5 rows and 3 columns, and we insert some + sample names, addresses and ages into each row: + + \snippet itemviews/simplewidgetmapper/window.cpp Set up the model + + As a result, each row can be treated like a record in a database, and the + widget mapper will read the data from each row, using the column numbers + specified earlier to access the correct data for each widget. This is + shown in the following diagram: + + \image widgetmapper-simple-mapping.png + + Since the user can navigate using the buttons in the user interface, the + example is fully-functional at this point, but to make it a bit more + user-friendly, we implement the \c{updateButtons()} slot to show when the + user is viewing the first or last records: + + \snippet itemviews/simplewidgetmapper/window.cpp Slot for updating the buttons + + If the mapper is referring to the first row in the model, the \uicontrol{Previous} + button is disabled. Similarly, the \uicontrol{Next} button is disabled if the + mapper reaches the last row in the model. + + \section1 More Complex Mappings + + The QDataWidgetMapper class makes it easy to relate information from a + model to widgets in a user interface. However, it is sometimes necessary + to use input widgets which offer choices to the user, such as QComboBox, + in conjunction with a widget mapper. + + In these situations, although the mapping to input widgets remains simple, + more work needs to be done to expose additional data to the widget mapper. + This is covered by the \l{Combo Widget Mapper Example}{Combo Widget Mapper} + and \l{SQL Widget Mapper Example}{SQL Widget Mapper} + examples. +*/ -- cgit v1.2.3