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authorCasper van Donderen <casper.vandonderen@nokia.com>2011-09-16 14:14:43 +0200
committerQt by Nokia <qt-info@nokia.com>2011-09-19 10:24:25 +0200
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Change-Id: I7d992889379d78e07a0b7023facebd7421cf6d22 Reviewed-on: http://codereview.qt-project.org/5092 Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com> Reviewed-by: Jerome Pasion <jerome.pasion@nokia.com>
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-/****************************************************************************
-**
-** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** 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.
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
- \page modelview.html
- \ingroup tutorials
- \startpage {index.html}{Qt Reference Documentation}
-
- \title Model/View Tutorial
- \brief An introduction to ModelView programming
-
- Every UI developer should know about ModelView programming and the goal of
- this tutorial is to provide you with an easily understandable introduction
- to this topic.
-
- Table, list and tree widgets are components frequently used in GUIs. There
- are 2 different ways how these widgets can access their data. The
- traditional way involves widgets which include internal containers for
- storing data. This approach is very intuitive, however, in many non-trivial
- applications, it leads to data synchronization issues.
- The second approach is model/view programming, in
- which widgets do not maintain internal data containers. They access external
- data through a standardized interface and therefore avoid data duplication.
- This may seem complicated at first, but once you take a closer look, it is
- not only easy to grasp, but the many benefits of model/view programming also
- become clearer.
-
- \image treeview.png
-
- In the process, we will learn about some basic technologies provided by Qt,
- such as:
-
- \list
- \o The difference between standard and model/view widgets
- \o Adapters betweeen forms and models
- \o Developing a simple model/view application
- \o Predefined models
- \o Intermediate topics such as:
- \list
- \o Tree views
- \o Selection
- \o Delegates
- \o Debugging with model test
- \endlist
- \endlist
-
- You will also learn whether your new application can be written easier with
- model/view programming or if classic widgets will work just as well.
-
- This tutorial includes example code for you to edit and integrate into your
- project. The tutorial's source code is located in Qt's
- \c examples/tutorials/modelview directory.
-
- For more detailed information you may also want to look at the
- \l{model-view-programming.html}{reference documentation}
-
- If you are completely new to Qt, please read \l{How to Learn Qt} if you
- have not already done so.
-
-
- \section1 1. Introduction
-
- Model/View is a technology used to separate data from views in widgets that
- handle data sets. Standard widgets are not designed for separating data
- from views and this is why Qt 4 has two different types of widgets. Both
- types of widgets look the same, but they interact with data differently.
-
- \table
- \row
- \o Standard widgets use data that is part of the widget.
- \o \image standardwidget.png
- \row
- \o View classes operate on external data (the model)
- \o \image modelview.png
- \endtable
-
- \section2 1.1 Standard Widgets
-
- Let's have a closer look at a standard table widget. A table widget is a 2D
- array of the data elements that the user can change. The table widget can be
- integrated into a program flow by reading and writing the data elements that
- the table widget provides.
- This method is very intuitive and useful in many applications, but displaying
- and editing a database table with a standard table widget can be problematic.
- Two copies of the data have to be coordinated: one outside the
- widget; one inside the widget. The developer is responsible for
- synchronizing both versions. Besides this, the tight coupling of presentation and data
- makes it harder to write unit tests.
-
- \section2 1.2 Model/View to the Rescue
-
- Model/view stepped up to provide a solution that uses a more versatile
- architecture. Model/view eliminates the data consistency problems that may
- occur with standard widgets. Model/view also makes it easier to use more
- than one view of the same data because one model can be passed on to many
- views. The most important difference is that model/view widgets do not store
- data behind the table cells. In fact, they operate directly from your data.
- Since view classes do not know your data's structure, you need to provide a
- wrapper to make your data conform to the QAbstractItemModel interface. A
- view uses this interface to read from and write to your data. Any instance
- of a class that implements QAbstractItemModel is said to be a model. Once
- the view receives a pointer to a model, it will read and display its content
- and be its editor.
-
- \section2 1.3 Overview of the Model/View Widgets
-
- Here is an overview of the model/view widgets and their corresponding
- standard widgets.
-
- \table
- \header
- \o Widget
- \o Standard Widget\br
- (an item based convenience class)
- \o Model/View View Class\br
- (for use with external data)
- \row
- \o \inlineimage listview.png
- \o \l QListWidget
- \o \l QListView
- \row
- \o \inlineimage tableview.png
- \o \l QTableWidget
- \o \l QTableView
- \row
- \o \inlineimage treeview.png
- \o \l QTreeWidget
- \o \l QTreeView
- \row
- \o \inlineimage columnview.png
- \o
- \o \l QColumnView shows a tree as a hierarchy of lists
- \row
- \o \inlineimage modelview-combobox.png
- \o {2, 1} \l QComboBox can work as both a view class and also
- as a traditional widget
- \endtable
-
- \section2 1.4 Using Adapters between Forms and Models
-
- Having adapters between forms and models can come in handy.
-
- We can edit data stored in tables directly from within the table itself, but
- it's much more comfortable to edit data in text fields. There is no direct
- model/view counterpart that separates data and views for widgets that
- operate on one value (QLineEdit, QCheckBox ...) instead of a dataset, so we
- need an adapter in order to connect the form to the source of data.
-
- \l QDataWidgetMapper is a great solution because it maps form widgets to a
- table row and makes it very easy to build forms for database tables.
-
- \image widgetmapper.png
-
- Another example of an adapter is \l QCompleter. Qt has \l QCompleter for
- providing auto-completions in Qt widgets such as \l QComboBox and, as shown
- below, \l QLineEdit. \l QCompleter uses a model as its data source.
-
- \image qcompleter.png
-
-
- \section1 2. A Simple Model/View Application
- If you want to develop a model/view application, where should you start?
- We recommend starting with a simple example and extending it step-by-step.
- This makes understanding the architecture a lot easier. Trying to understand
- the model/view architecture in detail before invoking the IDE has proven
- to be less convenient for many developers. It is substantially easier to
- start with a simple model/view application that has demo data. Give it a
- try! Simply replace the data in the examples below with your own.
-
- Below are 7 very simple and independent applications that show different
- sides of model/view programming. The source code can be found inside the
- \c{examples/tutorials/modelview} directory.
-
- \section2 2.1 A Read Only Table
-
- We start with an application that uses a QTableView to show data. We will
- add editing capabilities later.
-
- (file source: examples/tutorials/modelview/1_readonly/main.cpp)
- \snippet examples/tutorials/modelview/1_readonly/main.cpp Quoting ModelView Tutorial
-
- We have the usual \l {modelview-part2-main-cpp.html}{main()} function:
-
- Here is the interesting part: We create an instance of MyModel and use
- \l{QTableView::setModel()}{tableView.setModel(&myModel);} to pass a
- pointer of it to to \l{QTableView}{tableView}. \l{QTableView}{tableView}
- will invoke the methods of the pointer it has received to find out two
- things:
-
- \list
- \o How many rows and columns should be displayed.
- \o What content should be printed into each cell.
- \endlist
-
- The model needs some code to respond to this.
-
- We have a table data set, so let's start with QAbstractTableModel since it
- is easier to use than the more general QAbstractItemModel.
-
- (file source: examples/tutorials/modelview/1_readonly/mymodel.h)
- \snippet examples/tutorials/modelview/1_readonly/mymodel.h Quoting ModelView Tutorial
-
- QAbstractTableModel requires the implementation of three abstract methods.
-
- (file source: examples/tutorials/modelview/1_readonly/mymodel.cpp)
- \snippet examples/tutorials/modelview/1_readonly/mymodel.cpp Quoting ModelView Tutorial
-
- The number of rows and columns is provided by
- \l{QAbstractItemModel::rowCount()}{MyModel::rowCount()} and
- \l{QAbstractItemModel::columnCount()}{MyModel::columnCount()}. When the view
- has to know what the cell's text is, it calls the method
- \l{QAbstractItemModel::data()}{MyModel::data()}. Row and column information
- is specified with parameter \c index and the role is set to
- \l{Qt::ItemDataRole}{Qt::DisplayRole}. Other roles are covered in the next
- section. In our example, the data that should be displayed is generated. In
- a real application, \c MyModel would have a member called \c MyData, which
- serves as the target for all reading and writing operations.
-
- This small example demonstrates the passive nature of a model. The model
- does not know when it will be used or which data is needed. It simply
- provides data each time the view requests it.
-
- What happens when the model's data needs to be changed? How does the view
- realize that data has changed and needs to be read again? The model has to
- emit a signal that indicates what range of cells has changed. This will be
- demonstrated in section 2.3.
-
- \section2 2.2 Extending the Read Only Example with Roles
-
- In addition to controlling what text the view displays, the model also
- controls the text's appearance. When we slightly change the model, we get
- the following result: \image readonlytable_role.png
-
- In fact, nothing except for the \l{QAbstractItemModel::}{data()} method
- needs to be changed to set fonts, background colour, alignment and a
- checkbox.
- Below is the \l{QAbstractItemModel::data()}{data()} method that produces the
- result shown above. The difference is that this time we use parameter int
- role to return different pieces of information depending on its value.
-
- (file source: examples/tutorials/modelview/2_formatting/mymodel.cpp)
- \snippet examples/tutorials/modelview/2_formatting/mymodel.cpp Quoting ModelView Tutorial
-
- Each formatting property will be requested from the model with a separate
- call to the \l{QAbstractItemModel::data()}{data()} method. The \c role
- parameter is used to let the model know which property is being requested:
-
- \table
- \header
- \o \l{Qt::ItemDataRole}{enum Qt::ItemDataRole}
- \o Meaning
- \o Type
- \row
- \o \l{Qt::ItemDataRole}{}Qt::DisplayRole
- \o text
- \o QString
- \row
- \o \l{Qt::ItemDataRole}{Qt::FontRole}
- \o font
- \o QFont
- \row
- \o \l{Qt::ItemDataRole}{BackgroundRole}
- \o brush for the background of the cell
- \o QBrush
- \row
- \o \l{Qt::ItemDataRole}{Qt::TextAlignmentRole}
- \o text alignment
- \o \l{Qt::AlignmentFlag}{enum Qt::AlignmentFlag}
- \row
- \o {1, 3} \l{Qt::ItemDataRole}{Qt::CheckStateRole}
- \o {1, 3} suppresses checkboxes with \l{QVariant}{QVariant()},
-
- sets checkboxes with \l{Qt::CheckState}{Qt::Checked}
-
- or \l{Qt::CheckState}{Qt::Unchecked}
- \o {1, 3} \l{Qt::ItemDataRole}{enum Qt::ItemDataRole}
- \endtable
-
- Refer to the Qt namespace documentation to learn more about the
- \l{Qt::ItemDataRole}{Qt::ItemDataRole} enum's capabilities.
-
- Now we need to determine how using a separated model impacts the
- application's performance, so let's trace how often the view calls the
- \l{QAbstractItemModel::}{data()} method. In order to track how often the
- view calls the model, we have put a debug statement in the
- \l{QAbstractItemModel::}{data()} method, which logs onto the error output
- stream. In our small example, \l{QAbstractItemModel::}{data()} will be
- called 42 times.
- Each time you hover the cursor over the field,
- \l{QAbstractItemModel::}{data()} will be called again \mdash 7 times for
- each cell. That's why it is important to make sure that your data is
- available when \l{QAbstractItemModel::}{data()} is invoked and expensive
- lookup operations are cached.
-
- \section2 2.3 A Clock inside a Table Cell
-
- \image clock.png
-
- We still have a read only table, but this time the content changes every
- second because we are showing the current time.
-
- (file source: examples/tutorials/modelview/3_changingmodel/mymodel.cpp)
- \snippet examples/tutorials/modelview/3_changingmodel/mymodel.cpp quoting mymodel_QVariant
-
- Something is missing to make the clock tick. We need to tell the view every
- second that the time has changed and that it needs to be read again. We do
- this with a timer. In the constructor, we set its interval to 1 second and
- connect its timeout signal.
-
- (file source: examples/tutorials/modelview/3_changingmodel/mymodel.cpp)
- \snippet examples/tutorials/modelview/3_changingmodel/mymodel.cpp quoting mymodel_a
-
- Here is the corresponding slot:
-
- (file source: examples/tutorials/modelview/3_changingmodel/mymodel.cpp)
- \snippet examples/tutorials/modelview/3_changingmodel/mymodel.cpp quoting mymodel_b
-
- We ask the view to read the data in the top left cell again by emitting the
- \l{QAbstractItemModel::}{dataChanged()} signal. Note that we did not
- explicitly connect the \l{QAbstractItemModel::}{dataChanged()} signal to the
- view. This happened automatically when we called \l{QTableView::}{setModel()}.
-
- \section2 2.4 Setting up Headers for Columns and Rows
-
- Headers can be hidden via a view method: \c{tableView->verticalHeader()->hide();}
- \image modelview-header.png
-
- The header content, however, is set via the model, so we reimplement the
- \l{QAbstractItemModel::headerData()}{headerData()} method:
-
- (file source: examples/tutorials/modelview/4_headers/mymodel.cpp)
- \snippet examples/tutorials/modelview/4_headers/mymodel.cpp quoting mymodel_c
-
- Note that method \l{QAbstractItemModel::headerData()}{headerData()} also has
- a parameter role which has the same meaning as in
- \l{QAbstractItemModel::data()}{MyModel::data()}.
-
- \section2 2.5 The Minimal Editing Example
-
- In this example, we are going to build an application that automatically
- populates a window title with content by repeating values entered into table
- cells. To be able to access the window title easily we put the QTableView in
- a QMainWindow.
-
- The model decides whether editing capabilities are available. We only have
- to modify the model in order for the available editing capabilities to be
- enabled. This is done by reimplementing the following virtual methods:
- \l{QAbstractItemModel::}{setData()} and \l{QAbstractItemModel::}{flags()}.
-
- (file source: examples/tutorials/modelview/5_edit/mymodel.h)
- \snippet examples/tutorials/modelview/5_edit/mymodel.h Quoting ModelView Tutorial
-
- We use \c the two-dimensional array QString \c m_gridData to store our data.
- This makes \c m_gridData the core of \c MyModel. The rest of \c MyModel acts
- like a wrapper and adapts \c m_gridData to the QAbstractItemModel
- interface. We have also introduced the \c editCompleted() signal, which
- makes it possible to transfer the modified text to the window title.
-
- (file source: examples/tutorials/modelview/5_edit/mymodel.cpp)
- \snippet examples/tutorials/modelview/5_edit/mymodel.cpp quoting mymodel_e
-
- \l{QAbstractItemModel::setData()}{setData()} will be called each time the
- user edits a cell. The \c index parameter tells us which field has been
- edited and \c value provides the result of the editing process. The role
- will always be set to \l Qt::EditRole because our cells only contain text.
- If a checkbox were present and user permissions are set to allow the
- checkbox to be selected, calls would also be made with the role set to
- \l Qt::CheckStateRole.
-
- (file source: examples/tutorials/modelview/5_edit/mymodel.cpp)
- \snippet examples/tutorials/modelview/5_edit/mymodel.cpp quoting mymodel_f
-
- Various properties of a cell can be adjusted with
- \l{QAbstractItemModel::flags()}{flags()}.
-
- Returning \l{Qt::ItemFlag}{Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled}
- is enough to show an editor that a cell can be selected.
-
- If editing one cell modifies more data than the data in that particular
- cell, the model must emit a \l{QAbstractItemModel::}{dataChanged()} signal
- in order for the data that has been changed to be read.
-
-
- \section1 3. Intermediate Topics
-
- \section2 3.1 TreeView
-
- You can convert the example above into an application with a tree view.
- Simply replace QTableView with QTreeView, which results in a read/write
- tree. No changes have to be made to the model. The tree won't have any
- hierarchies because there aren't any hierarchies in the model itself.
-
- \image dummy_tree.png
-
- QListView, QTableView and QTreeView all use a model abstraction, which is a
- merged list, table and tree. This makes it possible to use several different
- types of view classes from the same model.
-
- \image list_table_tree.png
-
- This is how our example model looks so far:
-
- \image example_model.png
-
- We want to present a real tree. We have wrapped our data in the examples
- above in order to make a model. This time we use QStandardItemModel, which
- is a container for hierarchical data that also implements
- QAbstractItemModel. To show a tree, QStandardItemModel must be populated
- with \l{QStandardItem}s, which are able to hold all the standard properties
- of items like text, fonts, checkboxes or brushes.
-
- \image tree_2_with_algorithm.png
-
- (file source: examples/tutorials/modelview/6_treeview/mainwindow.cpp)
- \snippet examples/tutorials/modelview/6_treeview/mainwindow.cpp Quoting ModelView Tutorial
-
- We simply instantiate a QStandardItemModel and add a couple of
- \l{QStandardItem}{QStandardItems} to the constructor. We can then make a
- hierarchical data structure because a QStandardItem can hold other
- \l{QStandardItem}{QStandardItems}. Nodes are collapsed and expanded within
- the view.
-
- \section2 3.2 Working with Selections
-
- We want to access a selected item's content in order to output it into the
- window title together with the hierarchy level.
-
- \image selection2.png
-
- So let's create a couple of items:
-
- (file source: examples/tutorials/modelview/7_selections/mainwindow.cpp)
- \snippet examples/tutorials/modelview/7_selections/mainwindow.cpp quoting modelview_a
-
- Views manage selections within a separate selection model, which can be
- retrieved with the \l{QAbstractItemView::}{selectionModel()} method. We
- retrieve the selection Model in order to connect a slot to its
- \l{QAbstractItemView::}{selectionChanged()} signal.
-
- (file source: examples/tutorials/modelview/7_selections/mainwindow.cpp)
- \snippet examples/tutorials/modelview/7_selections/mainwindow.cpp quoting modelview_b
-
- We get the model index that corresponds to the selection by calling
- \l{QItemSelectionModel::currentIndex()}{treeView->selectionModel()->currentIndex()}
- and we get the the field's string by using the model index. Then we just
- calculate the item's \c hierarchyLevel. Top level items do not have parents
- and the \l{QAbstractItemModel::}{parent()} method will return a default
- constructed \l{QModelIndex}{QModelIndex()}. This is why we use the
- \l{QAbstractItemModel::}{parent()} method to iterate to the top level while
- counting the steps performed during iteration.
-
- The selection model (as shown above) can be retrieved, but it can also be
- set with \l{QAbstractItemView}{QAbstractItemView::setSelectionModel}. This
- is how it's possible to have 3 view classes with synchronised selections
- because only one instance of a selection model is used. To share a selection
- model between 3 views use \l{QAbstractItemView::}{selectionModel()} and
- assign the result to the second and third view class with
- \l{QAbstractItemView::}{setSelectionModel()}.
-
- \section2 3.3 Predefined Models
-
- The typical way to use model/view is to wrap specific data to make it usable
- with view classes. Qt, however, also provides predefined models for common
- underlying data structures. If one of the available data structures is
- suitable for your application, a predefined model can be a good choice.
-
- \table
- \row
- \o QStringListModel
- \o Stores a list of strings
- \row
- \o QStandardItemModel
- \o Stores arbitrary hierarchical items
- \row
- \o QFileSystemModel\br
- QDirModel
- \o Encapsulate the local file system
- \row
- \o QSqlQueryModel
- \o Encapsulate an SQL result set
- \row
- \o QSqlTableModel
- \o Encapsulates an SQL table
- \row
- \o QSqlRelationalTableModel
- \o Encapsulates an SQL table with foreign keys
- \row
- \o QSortFilterProxyModel
- \o Sorts and/or filters another model
-
- \endtable
-
- \section2 3.4 Delegates
-
- In all examples so far, data is presented as text or a checkbox in a cell
- and is edited as text or a checkbox. The component that provides these
- presentation and editing services is called a \e delegate. We are only just
- beginning to work with the delegate because the view uses a default
- delegate. But imagine that we want to have a different editor (e.g., a
- slider or a drop down list) Or imagine that we want to present data as
- graphics.
- Let's take a look at an example called \l{Star Delegate Example}{Star
- Delegate}, in which stars are used to show a rating:
-
- \image stardelegate.png
-
- The view has a \l{QAbstractItemView::}{setItemDelegate()} method that
- replaces the default delegate and installs a custom delegate.
- A new delegate can be written by creating a class that inherits from
- QStyledItemDelegate. In order to write a delegate that displays stars and
- has no input capabilities, we only need to override 2 methods.
-
- \code
- class StarDelegate : public QStyledItemDelegate
- {
- Q_OBJECT
- public:
- StarDelegate(QWidget *parent = 0);
- void paint(QPainter *painter, const QStyleOptionViewItem &option,
- const QModelIndex &index) const;
- QSize sizeHint(const QStyleOptionViewItem &option,
- const QModelIndex &index) const;
- };
- \endcode
-
- \l{QStyledItemDelegate::}{paint()} draws stars depending on the content of
- the underlying data. The data can be looked up by calling
- \l{QModelIndex::data()}{index.data()}. The delegate's
- \l{QAbstractItemDelegate::}{sizeHint()} method is used to obtain each
- star's dimensions, so the the cell will provide enough height and width to
- accommodate the stars.
-
- Writing custom delegates is the right choice if you want to show your data
- with a custom graphical representation inside the grid of the view class. If
- you want to leave the grid, you would not use a custom delegate but a custom
- view class.
-
- Other references to delegates in Qt Documentation:
-
- \list
- \o \l{Spin Box Delegate Example}
- \o \l{QAbstractItemDelegate}{QAbstractItemDelegate Class Reference}
- \o \l{QSqlRelationalDelegate}{QSqlRelationalDelegate Class Reference}
- \o \l{QStyledItemDelegate}{QStyledItemDelegate Class Reference}
- \o \l{QItemDelegate}{QItemDelegate Class Reference}
- \endlist
-
-
- \section2 3.5 Debugging with ModelTest
-
- The passive nature of models provides new challenges for programmers.
- Inconsistencies in the model can cause the application to crash. Since the
- model is hit by numerous calls from the view, it is hard to find out which
- call has crashed the application and which operation has introduced the
- problem.
-
- Qt Labs provides software called
- \l{http://labs.qt.nokia.com/page/Projects/Itemview/Modeltest}{ModelTest},
- which checks models while your programming is running. Every time the model
- is changed, ModelTest scans the model and reports errors with an assert.
- This is especially important for tree models, since their hierarchical
- nature leaves many possibilities for subtle inconsistencies.
-
- Unlike view classes, ModelTest uses out of range indexes to test the model.
- This means your application may crash with ModelTest even if it runs
- perfectly without it. So you also need to handle all of the indexes that are
- out of range when using ModelTest.
-
-
- \section1 4. Good Sources of Additional Information
-
- \section2 4.1 Books
-
- Model/View programming is covered quite extensively in the documentation of
- Qt but also in several good books.
-
- \list 1
- \o \bold{C++ GUI Programming with Qt 4} / Jasmin Blanchette, Mark Summerfield,
- \e{Prentice Hall, 2nd edition}, ISBN 0-13-235416-0. Also available in
- German: \bold{C++ GUI Programmierung mit Qt 4: Die offizielle Einführung},
- \e{Addison-Wesley}, ISBN 3-827327-29-6
- \o \bold{The Book of Qt4, The Art of Building Qt Applications} / Daniel Molkentin,
- \e{Open Source Press}, ISBN 1-59327-147-6.
- Translated from \bold{Qt 4, Einführung in die Applikationsentwicklung},
- \e{Open Source Press}, ISBN 3-937514-12-0.
- \o \bold{Foundations of Qt Development} / Johan Thelin, \e{Apress}, ISBN 1-59059-831-8.
- \o \bold{Advanced Qt Programming} / Mark Summerfield, \e{Prentice Hall}, ISBN 0-321-63590-6.
- This book covers Model/View programming on more than 150 pages.
- \endlist
-
- More information about these books is available on the
- \l{Books about Qt Programming}{Qt Web site}.
-
- The following list provides an overview of example programs contained in the first three
- books listed above. Some of them make very good templates for developing similar
- applications.
-
- \table
- \header
- \o Example name
- \o View class used
- \o Model used
- \o Aspects covered
- \o
- \row
- \o Team Leaders
- \o QListview
- \o QStringListModel
- \o
- \o Book 1, Chapter 10, Figure 10.6
- \row
- \o Directory Viewer
- \o QTreeView
- \o QDirModel
- \o
- \o Book 1, Chapter 10, Figure 10.7
- \row
- \o Color Names
- \o QListView
- \o QSortFilterProxyModel
- applied to QStringListModel
- \o
- \o Book 1, Chapter 10, Figure 10.8
- \row
- \o Currencies
- \o QTableView
- \o custom model based on
- QAbstractTableModel
- \o Read only
- \o Book 1, Chapter 10, Figure 10.10
- \row
- \o Cities
- \o QTableView
- \o Custom model based on
- QAbstractTableModel
- \o Read / write
- \o Book 1, Chapter 10, Figure 10.12
- \row
- \o Boolean Parser
- \o QTreeView
- \o Custom model based on
- QAbstractItemModel
- \o Read only
- \o Book 1, Chapter 10, Figure 10.14
- \row
- \o Track Editor
- \o {2, 1} QTableWidget
- \o Custom delegate providing a custom editor
- \o Book 1, Chapter 10, Figure 10.15
-
- \row
- \o Four directory views
- \o QListView
- QTableView
- QTreeView
- \o QDirModel
- \o Demonstrates the use of multiple views
- \o Book2, Chapter 8.2
- \row
- \o Address Book
- \o QListView
- QTableView
- QTreeView
- \o Custom model based on
- QAbstractTableModel
- \o Read / write
- \o Book2, Chapter 8.4
- \row
- \o Address Book with sorting
- \o
- \o QProxyModel
- \o Introducing sort and filter capabilities
- \o Book2, Chapter 8.5
- \row
- \o Address Book
- with checkboxes
- \o
- \o
- \o Introducing checkboxes in model/view
- \o Book2, Chapter 8.6
- \row
- \o Address Book with transposed grid
- \o
- \o Custom proxy Model based on QAbstractProxyModel
- \o Introducing a custom model
- \o Book2, Chapter 8.7
- \row
- \o Address Book with drag and drop
- \o
- \o
- \o Introducing drag and drop support
- \o Book2, Chapter 8.8
- \row
- \o Address Book with custom editor
- \o
- \o
- \o Introducing custom delegates
- \o Book2, Chapter 8.9
- \row
- \o Views
- \o QListView
- QTableView
- QTreeView
- \o QStandardItemModel
- \o Read only
- \o Book 3, Chapter 5, figure 5-3
- \row
- \o Bardelegate
- \o QTableView
- \o
- \o Custom delegate for presentation based on QAbstractItemDelegate
- \o Book 3, Chapter 5, figure 5-5
- \row
- \o Editdelegate
- \o QTableView
- \o
- \o Custom delegate for editing based on QAbstractItemDelegate
- \o Book 3, Chapter 5, figure 5-6
- \row
- \o Singleitemview
- \o Custom view based on QAbstractItemView
- \o
- \o Custom view
- \o Book 3,
- Chapter 5,
- figure 5-7
- \row
- \o listmodel
- \o QTableView
- \o Custom Model based on QAbstractTableModel
- \o Read only
- \o Book 3, Chapter 5, Figure 5-8
- \row
- \o treemodel
- \o QTreeView
- \o Custom Model based on QAbstractItemModel
- \o Read only
- \o Book 3, Chapter 5, Figure 5-10
- \row
- \o edit integers
- \o QListView
- \o Custom Model based on QAbstractListModel
- \o Read / write
- \o Book 3, Chapter 5, Listing 5-37, Figure 5-11
- \row
- \o sorting
- \o QTableView
- \o QSortFilterProxyModel applied to QStringListModel
- \o Demonstrates sorting
- \o Book 3, Chapter 5, Figure 5-12
- \endtable
-
-
- \section2 4.2 Qt Documentation
-
- Qt 5.0 comes with 19 examples for model/view.
- The examples can be found on the \l{Item Views Examples} page.
-
- \table
- \header
- \o Example name
- \o View class used
- \o Model used
- \o Aspects covered
- \row
- \o Address Book
- \o QTableView
- \o QAbstractTableModel
- QSortFilterProxyModel
- \o Usage of QSortFilterProxyModel to generate different
- subsets from one data pool
- \row
- \o Basic Sort/Filter Model
- \o QTreeView
- \o QStandardItemModel
- QSortFilterProxyModel
- \o
- \row
- \o Chart
- \o Custom view
- \o QStandardItemModel
- \o Designing custom views that cooperate with selection models
- \row
- \o Color Editor Factory
- \o {2, 1} QTableWidget
- \o Enhancing the standard delegate with a new custom editor to choose colours
- \row
- \o Combo Widget Mapper
- \o QDataWidgetMapper to map QLineEdit, QTextEdit and QComboBox
- \o QStandardItemModel
- \o Shows how a QComboBox can serve as a view class
- \row
- \o Custom Sort/Filter Model
- \o QTreeView
- \o QStandardItemModel
- QSortFilterProxyModel
- \o Subclass QSortFilterProxyModel for advanced sorting and filtering
- \row
- \o Dir View
- \o QTreeView
- \o QDirModel
- \o Very small example to demonstrate how to assign a model to a view
- \row
- \o Editable Tree Model
- \o QTreeView
- \o Custom tree model
- \o Comprehensive example for working with trees, demonstrates
- editing cells and tree structure with an underlying custom
- model
- \row
- \o Fetch More
- \o QListView
- \o Custom list model
- \o Dynamically changing model
- \row
- \o Frozen Column
- \o QTableView
- \o QStandardItemModel
- \o
- \row
- \o Interview
- \o Multiple
- \o Custom item model
- \o Multiple views
- \row
- \o Pixelator
- \o QTableView
- \o Custom table model
- \o Implementation of a custom delegate
- \row
- \o Puzzle
- \o QListView
- \o Custom list model
- \o Model/view with drag and drop
- \row
- \o Simple DOM Model
- \o QTreeView
- \o Custom tree model
- \o Read only example for a custom tree model
- \row
- \o Simple Tree Model
- \o QTreeView
- \o Custom tree model
- \o Read only example for a custom tree model
- \row
- \o Simple Widget Mapper
- \o QDataWidgetMapper to map QLineEdit, QTextEdit and QSpinBox
- \o QStandardItemModel
- \o Basic QDataWidgetMapper usage
- \row
- \o Spin Box Delegate
- \o QTableView
- \o QStandardItemModel
- \o Custom delegate that uses a spin box as a cell editor
- \row
- \o Spreadsheet
- \o {2, 1} QTableView
- \o Custom delegates
- \row
- \o Star Delegate
- \o {2, 1} QTableWidget
- \o Comprehensive custom delegate example.
- \endtable
-
- A \l{Model/View Programming}{reference document} for model/view technology
- is also available.
-*/
-
-/*!
- \page modelview-part2-main-cpp.html
- \title main.cpp
- \quotefile tutorials/modelview/1_readonly/main.cpp
-*/