author | hgs |
Mon, 18 Oct 2010 18:23:13 +0300 | |
changeset 34 | ed14f46c0e55 |
parent 7 | 923ff622b8b9 |
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/**************************************************************************** |
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** |
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (developer.feedback@nokia.com) |
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** |
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** This file is part of the HbUtils module of the UI Extensions for Mobile. |
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** |
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** GNU Lesser General Public License Usage |
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** This file may be used under the terms of the GNU Lesser General Public |
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** License version 2.1 as published by the Free Software Foundation and |
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** appearing in the file LICENSE.LGPL included in the packaging of this file. |
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** Please review the following information to ensure the GNU Lesser General |
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** Public License version 2.1 requirements will be met: |
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at developer.feedback@nokia.com. |
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** |
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****************************************************************************/ |
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#include "hbdocumentloader.h" |
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#include "hbdocumentloader_p.h" |
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#include "hbdocumentloaderactions_p.h" |
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#include "hbdocumentloadersyntax_p.h" |
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#include <QString> |
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#include <QGraphicsWidget> |
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#include <QFile> |
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/*! |
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@stable |
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@hbutils |
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\class HbDocumentLoader |
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\brief The HbDocumentLoader class loads UI definitions from DocML files and constructs a hierarchy of widgets in memory. |
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HbDocumentLoader loads and parses UI definitions from DocML files. |
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A DocML file usually contains a UI definition of a view or a dialog, and defines layouts, widgets and actions. |
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Using HbDocumentLoader you can load an entire UI screen by calling the load() method, which returns an object list to the caller. |
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The object list contains the root objects defined at the top level of the DocML file (child elements of <hbdocument>). Each root object |
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may have child objects, so a hierarchy of objects is returned to the caller. Object ownership is passed to the caller. |
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An HbDocumentLoader object keeps references to the loaded objects until the reset() method is called, but it is up to your code |
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to manage the lifecycle of the returned objects. For widgets this is often easy, since they have either a containing view or a |
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layout as a parent: Qt's object cleanup policy means that child objects are automatically deleted. |
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You must be careful to manage the lifecycle of any root objects returned by load() that are not owned by another object, |
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such as HbAction objects that do not have a menu or toolbar role. |
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A DocML file contains only a UI definition. To connect your UI objects in code you must get pointers to them. |
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Use the findObject() and findWidget() methods to get pointers to your UI objects, which you can then connect using their signals and slots. |
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HbDocumentLoader uses the createObject() method to create objects. By default, this method always creates new object instances |
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based on the class name in the DocML. This method can create the public widgets of the Hb library and some basic objects that derive |
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from QObject, such as HbAction. |
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In order to be able to load your own classes of objects from DocML, for example to load your own custom widgets, you can either: |
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- create your own custom loader by subclassing from HbDocumentLoader and overriding the createObject() method. |
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- create an HbDocumentLoaderPlugin object in a separate library. |
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HbDocumentLoader can load DocML in either text-based or binary format. Using a binary format reduces the time to load and parse a DocML file. |
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You can create binary DocML files by specifying your DocML files in your project file. To declare a DocML file for conversion to binary format, add the following to the project file: |
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\code |
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DOCML += hello_docml_world.docml |
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\endcode |
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When the build process runs, files with the suffix docml.bin are created. You create entries in the resource file to load the binary DocML. |
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The following shows a binary DocML file declared in the resource file. The binary file is given an alias ending in .docml which is used to reference it in code. |
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\code |
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<RCC> |
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<qresource prefix="/docml"> |
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<file alias="hello_docml_world.docml">hello_docml_world.docml.bin</file> |
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</qresource> |
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</RCC> |
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\endcode |
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\section _usecases_hbdocumentloader Using the HbDocumentLoader class. |
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\subsection _uc_001_hbdocumentloader Loading a simple DocML file containing a view definition. |
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\code |
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int main(int argc, char *argv[]) |
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{ |
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HbApplication app(argc, argv); |
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HbMainWindow window; |
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// Create a document loader object. |
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HbDocumentLoader loader; |
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bool ok = false; |
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// Load the DocML file. |
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loader.load(":/docml/hello_docml_world.docml", &ok); |
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if (ok) { |
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// Get the view and add it to the main window. |
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HbView* view = qobject_cast<HbView*>(loader.findWidget("view")); |
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window.addView(view); |
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} |
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else { |
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qFatal("Unable to read :/docml/hello_docml_world.docml"); |
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} |
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window.show(); |
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return app.exec(); |
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} |
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\endcode |
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\subsection _uc_002_hbdocumentloader Getting pointers to loaded objects and taking ownership. |
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Call findObject() and findWidget() to get pointers to and take ownership of loaded objects |
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\code |
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const QString LIST_VIEW = ":/resources/ui/listview.docml"; |
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HbDocumentLoader* loader; |
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loader = new HbDocumentLoader(); |
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HbView* listView; |
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HbListView* notesList; |
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HbAction* newNoteAction; |
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HbAction* deleteNoteAction; |
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// Load the DocML which defines the notes list view |
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bool loaded = false; |
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loader->reset(); |
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loader->load(LIST_VIEW, &loaded); |
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Q_ASSERT_X(loaded, "Notes::load", "Unable to load view from DocML"); |
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if ( loaded ) { |
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QGraphicsWidget *widget = loader->findWidget(QString("view")); |
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if (widget) { |
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// Widgets |
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listView = qobject_cast<HbView*>(widget); |
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notesList = qobject_cast<HbListView*>(loader->findWidget("notesList")); |
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// Actions |
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newNoteAction = qobject_cast<HbAction*>(loader->findObject("newNoteAction")); |
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deleteNoteAction = qobject_cast<HbAction*>(loader->findObject("deleteNoteAction")); |
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} |
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\endcode |
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*/ |
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/*! |
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Default Constructor. |
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Use HbDocumentLoader(const HbMainWindow *window) constructor if an application |
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has an HbMainWindow. If the main window parameter is omitted |
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HbDeviceProfile::current() is used to access the device profile. |
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*/ |
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HbDocumentLoader::HbDocumentLoader() |
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: d_ptr(new HbDocumentLoaderPrivate(0)) |
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{ |
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Q_D(HbDocumentLoader); |
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d->q_ptr = this; |
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} |
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/*! |
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Constructor. |
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HbMainWindow is needed to access the device profile of the application's main window. |
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HbDeviceProfile::current() is used in case where the window parameter is omitted. |
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\param window main window of the loaded layout. |
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*/ |
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HbDocumentLoader::HbDocumentLoader(const HbMainWindow *window) |
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: d_ptr(new HbDocumentLoaderPrivate(window)) |
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{ |
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Q_D(HbDocumentLoader); |
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d->q_ptr = this; |
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} |
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/*! |
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Destructor. |
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*/ |
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HbDocumentLoader::~HbDocumentLoader() |
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{ |
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delete d_ptr; |
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} |
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/*! |
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Loads and processes a DocML file. |
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||
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On successful execution, returns a list of root objects. This list contains |
|
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only the objects which do not have an owner already. For example the child of a parent |
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widget is never returned, and the parent is returned only if it does not |
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have its own parent or a specific role like a menu-role. The document |
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loader instance does not own any of the objects: the ones which do not |
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have any other owner are returned within the root object list. The caller |
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is resposible of handling the lifecycle of the returned objects. |
|
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||
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Usually this returns the view or the dialog which the loaded DocML files defines. |
|
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There are also situations when this function returns an empty list. These cases |
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usually include sections, which change the existing properties of loaded objects and do not |
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create any new root objects. Also, any objects passed to the document loader using the setObjectTree() |
|
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function are not returned. The success of calling load() cannot therefore be |
|
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determined directly by the number of the returned objects. |
|
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Check the parameter \a ok to see if the document was loaded successfully. |
|
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||
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\param fileName The %file to be loaded. |
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\param section Space separated path to the section to load. |
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\param ok Indicates whether loading was successful. |
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\return Root objects list. On failed execution, returns an empty list and deletes the created object hierarchy, which |
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may be incomplete. |
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*/ |
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QObjectList HbDocumentLoader::load( const QString &fileName, const QString §ion , bool *ok ) |
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{ |
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QFile file( fileName ); |
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if( !file.open( QFile::ReadOnly ) ) { |
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qWarning( "Unable to open file" ); |
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if( ok ) { |
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*ok = false; |
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} |
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return QList<QObject *>(); |
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} |
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|
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return load( &file, section, ok ) ; |
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} |
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|
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/*! |
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This is an overloaded member function, provided for convenience. |
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\param device The IO device to be processed. |
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\param section Space separated route to the section that you want to load. |
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\param ok Indicates whether loading was successful. |
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\return Root objects list. |
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*/ |
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QObjectList HbDocumentLoader::load( QIODevice *device, const QString §ion, bool *ok ) |
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{ |
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Q_D(HbDocumentLoader); |
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|
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if( ok ) { |
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*ok = d->load( device, section ); |
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} else { |
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d->load( device, section ); |
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} |
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return d->takeAll(); |
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} |
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|
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/*! |
34 | 246 |
This is an overloaded member function, provided for convenience. It loads the part of the DocML that is |
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outside of any section. |
34 | 248 |
\param fileName The %file to be processed. |
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\param ok Indicates whether loading was successful. |
|
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\return Root objects list. |
|
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*/ |
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QObjectList HbDocumentLoader::load( const QString &fileName, bool *ok ) |
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{ |
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return load( fileName, QString(), ok ); |
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} |
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|
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/*! |
34 | 258 |
This is an overloaded member function, provided for convenience. It loads the part of the DocML that is |
0
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outside of any section. |
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\param device IO device to be processed. |
34 | 261 |
\param ok Indicates if loading was successful. |
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\return Root objects list. |
|
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*/ |
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QObjectList HbDocumentLoader::load( QIODevice *device, bool *ok ) |
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{ |
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return load( device, QString(), ok ); |
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} |
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|
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/*! |
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Converts a text-based DocML document to a binary document at runtime. |
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|
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You can also convert DocML files to binary format at build time by listing the files in the "DOCML" |
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variable in the .pro file. This will create a binary docml file called <file_name>.bin that |
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can be included with the application resources (.qrc file). |
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|
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Known issues: Currently the resource compiler gives warnings about missing binary files during |
34 | 277 |
qmake. You can safely ignore these warnings. |
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|
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\param srcDevice Source IO device to be processed. |
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\param dstDevice Destination IO device to which to write the binary DocML. |
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\return True if the conversion to binary was successful. |
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*/ |
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bool HbDocumentLoader::createBinary( QIODevice *srcDevice, QIODevice *dstDevice ) |
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{ |
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Q_D(HbDocumentLoader); |
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return d->createBinary( srcDevice, dstDevice ); |
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} |
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|
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/*! |
34 | 290 |
Retrieves widget whose object name is \a name. |
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\param name The name of the widget in DocML. |
|
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\return The found widget or 0 if not found. |
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*/ |
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QGraphicsWidget *HbDocumentLoader::findWidget(const QString &name) const |
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{ |
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const Q_D(HbDocumentLoader); |
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return d->findWidget(name); |
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} |
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|
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|
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/*! |
34 | 302 |
Retrieves object whose object name is \a name. |
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\param name The name of the widget in DocML. |
|
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\return The found object or 0 if not found. |
|
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*/ |
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QObject *HbDocumentLoader::findObject(const QString &name) const |
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{ |
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const Q_D(HbDocumentLoader); |
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return d->findObject(name); |
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} |
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|
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|
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/*! |
34 | 314 |
Inserts an object tree into the document loader object. |
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You can use the output of the load() method as the \a roots parameter. |
|
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The document loader does not take ownership of the passed objects. |
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|
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\param roots The list of root objects to add to the loader. |
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\return True if the objects were successfully added to the document loader, false otherwise. |
|
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*/ |
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bool HbDocumentLoader::setObjectTree( QObjectList roots ) |
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{ |
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Q_D(HbDocumentLoader); |
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return d->setObjectTree( roots ); |
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} |
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|
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/*! |
34 | 329 |
Looks up an object which inherits class \a type and for which the |
330 |
object name is \a name. If you decide to override this method in your own document loader class, |
|
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call this base class method in case you are |
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not able to create an instance of the specified object type. |
|
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\param type The type of the object to create. |
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\param name The object name of the object to create. |
|
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\return The created object or 0 if it could not be created. |
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0
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*/ |
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QObject *HbDocumentLoader::createObject(const QString& type, const QString &name) |
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{ |
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#ifdef HB_BOOTSTRAPPED |
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Q_UNUSED(type); |
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Q_UNUSED(name); |
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return 0; |
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#else |
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Q_D(HbDocumentLoader); |
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return d->actions->createObjectWithFactory(type, name); |
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#endif |
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} |
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|
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|
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/*! |
34 | 351 |
Sets loader to an initial state without references to any loaded objects. |
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*/ |
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void HbDocumentLoader::reset() |
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{ |
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Q_D(HbDocumentLoader); |
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d->reset(); |
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} |
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|
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|
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/*! |
34 | 361 |
Prints the current version of the document loader and the minimum version of supported DocML in brackets |
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For example "3.2 (1.4)" means that current version is 3.2 and DocML versions from 1.4 to 3.2 are supported |
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*/ |
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QString HbDocumentLoader::version() |
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{ |
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return HbDocumentLoaderPrivate::version(); |
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} |