// Created: 2009-01-23
// RCS-ID: $Id$
// Copyright: (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
@page overview_persistence Persistent Objects Overview
+@tableofcontents
+
Persistent objects are simply the objects which automatically save their state
when they are destroyed and restore it when they are recreated, even during
another program invocation.
class doesn't need to be modified at all in order to add support for saving and
restoring its properties.
-The persistence framework involves
- - wxPersistenceManager which all persistent objects register themselves with.
- This class handles actual saving and restoring of persistent data as well as
- various global aspects of persistence, e.g. it can be used to disable
- restoring the saved data.
- - wxPersistentObject is the base class for all persistent objects or, rather,
- adaptors for the persistent objects as this class main purpose is to provide
- the bridge between the original class -- which has no special persistence
- support -- and wxPersistenceManager,
- - wxPersistentWindow<> which derives from wxPersistentObject and implements some
- of its methods using wxWindow-specific functionality. Notably,
- wxPersistenceManager handles the destruction of persistent windows
- automatically implicitly while it has to be done explicitly for the
- arbitrary persistent objects.
- - wxCreatePersistentObject() function which is used to create the
- appropriate persistence adapter for the object.
+The persistence framework includes the following components:
+
+- wxPersistenceManager which all persistent objects register themselves with.
+ This class handles actual saving and restoring of persistent data as well as
+ various global aspects of persistence, e.g. it can be used to disable
+ restoring the saved data.
+- wxPersistentObject is the base class for all persistent objects or, rather,
+ adaptors for the persistent objects as this class main purpose is to provide
+ the bridge between the original class -- which has no special persistence
+ support -- and wxPersistenceManager,
+- wxPersistentWindow<> which derives from wxPersistentObject and implements some
+ of its methods using wxWindow-specific functionality. Notably,
+ wxPersistenceManager handles the destruction of persistent windows
+ automatically implicitly while it has to be done explicitly for the
+ arbitrary persistent objects.
+- wxCreatePersistentObject() function which is used to create the
+ appropriate persistence adapter for the object.
@section persistence_using Using Persistent Windows
wxWidgets has built-in support for a (constantly growing) number of controls.
Currently the following classes are supported:
- - wxTopLevelWindow (and hence wxFrame and wxDialog)
- - wxBookCtrlBase, i.e. wxNotebook, wxListbook, wxToolbook and wxChoicebook
- - wxTreebook
+
+- wxTopLevelWindow (and hence wxFrame and wxDialog)
+- wxBookCtrlBase (i.e. wxNotebook, wxListbook, wxToolbook and wxChoicebook)
+- wxTreebook
To automatically save and restore the properties of the windows of classes
-listed above you need to
-
- -# Set a unique name for the window using wxWindow::SetName(): this step is
- important as the name is used in the configuration file and so must be
- unique among all windows of the same class.
-
- -# Call wxPersistenceManager::Register() at any moment after creating the
- window and then wxPersistenceManager::Restore() when the settings may be
- restored (which can't be always done immediately, e.g. often the window
- needs to be populated first). If settings can be restored immediately after
- the window creation, as is often the case for wxTopLevelWindow, for
- example, then wxPersistenceManager::RegisterAndRestore() can be used to do
- both at once.
-
- -# If you do not want the settings for the window to be saved (for example
- the changes to the dialog size are usually not saved if the dialog was
- cancelled), you need to call wxPersistenceManager::Unregister() manually.
- Otherwise the settings will be automatically saved when the control itself
- is destroyed.
+listed above you need to:
+
+-# Set a unique name for the window using wxWindow::SetName(): this step is
+ important as the name is used in the configuration file and so must be
+ unique among all windows of the same class.
+-# Call wxPersistenceManager::Register() at any moment after creating the
+ window and then wxPersistenceManager::Restore() when the settings may be
+ restored (which can't be always done immediately, e.g. often the window
+ needs to be populated first). If settings can be restored immediately after
+ the window creation, as is often the case for wxTopLevelWindow, for
+ example, then wxPersistenceManager::RegisterAndRestore() can be used to do
+ both at once.
+-# If you do not want the settings for the window to be saved (for example
+ the changes to the dialog size are usually not saved if the dialog was
+ cancelled), you need to call wxPersistenceManager::Unregister() manually.
+ Otherwise the settings will be automatically saved when the control itself
+ is destroyed.
Example of using a notebook control which automatically remembers the last open
page:
+
@code
wxNotebook *book = new wxNotebook(parent, wxID_ANY);
book->SetName("MyBook"); // do not use the default name
User-defined classes can be easily integrated with wxPersistenceManager. To add
support for your custom class @c MyWidget you just need to:
- -# Define a new @c MyPersistentWidget class inheriting from
- wxPersistentWindow<MyWidget>.
-
- -# Implement its pure virtual GetKind() method returning a unique string
- identifying all @c MyWidget objects, typically something like @c "widget"
-
- -# Implement its pure virtual Save() and Restore() methods to actually save
- and restore the widget settings using wxPersistentObject::SaveValue() and
- wxPersistentObject::RestoreValue() methods.
-
- -# Define wxCreatePersistentObject() overload taking @c MyWidget * and
- returning a new @c MyPersistentWidget object.
+-# Define a new @c MyPersistentWidget class inheriting from
+ wxPersistentWindow<MyWidget>.
+-# Implement its pure virtual GetKind() method returning a unique string
+ identifying all @c MyWidget objects, typically something like @c "widget"
+-# Implement its pure virtual Save() and Restore() methods to actually save
+ and restore the widget settings using wxPersistentObject::SaveValue() and
+ wxPersistentObject::RestoreValue() methods.
+-# Define wxCreatePersistentObject() overload taking @c MyWidget * and
+ returning a new @c MyPersistentWidget object.
If you want to add persistence support for a class not deriving from wxWindow,
you need to derive @c MyPersistentWidget directly from wxPersistentObject and
called when your object is destroyed as this can be only done automatically for
windows.
- */
-
+*/
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