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54 lines
3.2 KiB
54 lines
3.2 KiB
Multiwallet Qt Development and Integration Strategy
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In order to support loading of multiple wallets in bitcoin-qt, a few changes in the UI architecture will be needed.
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Fortunately, only four of the files in the existing project are affected by this change.
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Three new classes have been implemented in three new .h/.cpp file pairs, with much of the functionality that was previously
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implemented in the BitcoinGUI class moved over to these new classes.
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The two existing files most affected, by far, are bitcoingui.h and bitcoingui.cpp, as the BitcoinGUI class will require
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some major retrofitting.
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Only requiring some minor changes is bitcoin.cpp.
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Finally, three new headers and source files will have to be added to bitcoin-qt.pro.
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Changes to class BitcoinGUI
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---------------------------
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The principal change to the BitcoinGUI class concerns the QStackedWidget instance called centralWidget.
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This widget owns five page views: overviewPage, transactionsPage, addressBookPage, receiveCoinsPage, and sendCoinsPage.
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A new class called *WalletView* inheriting from QStackedWidget has been written to handle all renderings and updates of
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these page views. In addition to owning these five page views, a WalletView also has a pointer to a WalletModel instance.
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This allows the construction of multiple WalletView objects, each rendering a distinct wallet.
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A second class called *WalletStack*, also inheriting from QStackedWidget, has been written to handle switching focus between
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different loaded wallets. In its current implementation, as a QStackedWidget, only one wallet can be viewed at a time -
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but this can be changed later.
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A third class called *WalletFrame* inheriting from QFrame has been written as a container for embedding all wallet-related
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controls into BitcoinGUI. At present it just contains a WalletStack instance and does little more than passing on messages
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from BitcoinGUI to the WalletStack, which in turn passes them to the individual WalletViews. It is a WalletFrame instance
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that takes the place of what used to be centralWidget in BitcoinGUI. The purpose of this class is to allow future
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refinements of the wallet controls with minimal need for further modifications to BitcoinGUI, thus greatly simplifying
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merges while reducing the risk of breaking top-level stuff.
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Changes to bitcoin.cpp
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----------------------
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bitcoin.cpp is the entry point into bitcoin-qt, and as such, will require some minor modifications to provide hooks for
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multiple wallet support. Most importantly will be the way it instantiates WalletModels and passes them to the
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singleton BitcoinGUI instance called window. Formerly, BitcoinGUI kept a pointer to a single instance of a WalletModel.
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The initial change required is very simple: rather than calling window.setWalletModel(&walletModel); we perform the
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following two steps:
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window.addWallet("~Default", &walletModel);
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window.setCurrentWallet("~Default");
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The string parameter is just an arbitrary name given to the default wallet. It's been prepended with a tilde to avoid name
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collisions in the future with additional wallets.
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The shutdown call window.setWalletModel(0) has also been removed. In its place is now:
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window.removeAllWallets();
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