[GUI] More work to support transactions

- Refactor GUI with FormBase.qml
- Fix memo handling in TransferOperation
- Add TransactionConfirmationForm.qml which will eventually display a
transaction for confirmation

libraries/chain/protocol/memo.cpp

@@ -6,8 +6,10 @@ namespace graphene { namespace chain {
 void memo_data::set_message(const fc::ecc::private_key& priv, const fc::ecc::public_key& pub,
                             const string& msg, uint64_t custom_nonce)
 {
-   if( from != public_key_type() )
+   if( priv != fc::ecc::private_key() && public_key_type(pub) != public_key_type() )
    {
+      from = priv.get_public_key();
+      to = pub;
       if( custom_nonce == 0 )
       {
          uint64_t entropy = fc::sha224::hash(fc::ecc::private_key::generate())._hash[0];

programs/light_client/Account.hpp

@@ -51,7 +51,6 @@ public:
 
    void update(const account_balance_object& balance);
 
-
    /**
     * Anything greater than 1.0 means full authority.
     * Anything between (0 and 1.0) means partial authority

programs/light_client/GrapheneApplication.cpp

@@ -2,6 +2,7 @@
 #include "ChainDataModel.hpp"
 #include "Wallet.hpp"
 #include "Operations.hpp"
+#include "Transaction.hpp"
 
 #include <graphene/app/api.hpp>
 
@@ -74,6 +75,11 @@ void GrapheneApplication::start(QString apiurl, QString user, QString pass)
    }
 }
 
+Transaction* GrapheneApplication::createTransaction() const
+{
+   return new Transaction;
+}
+
 Q_SLOT void GrapheneApplication::execute(const std::function<void()>& func)const
 {
    func();

programs/light_client/GrapheneApplication.hpp

@@ -14,6 +14,8 @@ class websocket_client;
 
 class ChainDataModel;
 class OperationBuilder;
+class OperationBase;
+class Transaction;
 class Wallet;
 class GrapheneApplication : public QObject {
    Q_OBJECT
@@ -62,6 +64,9 @@ public:
       return m_isConnected;
    }
 
+   /// Convenience method to get a Transaction in QML. Caller takes ownership of the new Transaction.
+   Q_INVOKABLE Transaction* createTransaction() const;
+
 Q_SIGNALS:
    void exceptionThrown(QString message);
    void loginFailed();

programs/light_client/Operations.cpp

@@ -5,8 +5,7 @@
 TransferOperation* OperationBuilder::transfer(ObjectId sender, ObjectId receiver, qint64 amount,
                                              ObjectId amountType, QString memo, ObjectId feeType)
 {
-   static fc::ecc::private_key dummyPrivate = fc::ecc::private_key::generate();
+   try {
-   static fc::ecc::public_key dummyPublic = fc::ecc::private_key::generate().get_public_key();
       TransferOperation* op = new TransferOperation;
       op->setSender(sender);
       op->setReceiver(receiver);
@@ -15,8 +14,30 @@ TransferOperation* OperationBuilder::transfer(ObjectId sender, ObjectId receiver
       op->setMemo(memo);
       op->setFeeType(feeType);
       auto feeParameters = model.global_properties().parameters.current_fees->get<graphene::chain::transfer_operation>();
-   op->operation().memo = graphene::chain::memo_data();
-   op->operation().memo->set_message(dummyPrivate, dummyPublic, memo.toStdString());
       op->setFee(op->operation().calculate_fee(feeParameters).value);
       return op;
+   } catch (const fc::exception& e) {
+      qDebug() << e.to_detail_string().c_str();
+      return nullptr;
+   }
+}
+
+QString TransferOperation::memo() const {
+   if (!m_op.memo)
+      return QString::null;
+   QString memo = QString::fromStdString(m_op.memo->get_message({}, {}));
+   while (memo.endsWith('\0'))
+      memo.chop(1);
+   return memo;
+}
+
+void TransferOperation::setMemo(QString memo) {
+   if (memo == this->memo())
+      return;
+   if (!m_op.memo)
+      m_op.memo = graphene::chain::memo_data();
+   while (memo.size() % 32)
+      memo.append('\0');
+   m_op.memo->set_message({}, {}, memo.toStdString());
+   Q_EMIT memoChanged();
 }

programs/light_client/Operations.hpp

@@ -37,7 +37,6 @@ class TransferOperation : public OperationBase {
    Q_PROPERTY(QString memo READ memo WRITE setMemo NOTIFY memoChanged)
 
    graphene::chain::transfer_operation m_op;
-   QString m_memo;
 
 public:
    TransferOperation(){}
@@ -57,9 +56,9 @@ public:
    ObjectId receiver() const { return m_op.to.instance.value; }
    qint64 amount() const { return m_op.amount.amount.value; }
    ObjectId amountType() const { return m_op.amount.asset_id.instance.value; }
-   /// This does not deal with encrypted memos. The memo stored here is unencrypted, and does not get stored in the
+   /// This does not deal with encrypted memos. The memo stored here is unencrypted. The encryption step must be
-   /// underlying graphene operation. The encryption and storage steps must be handled elsewhere.
+   /// performed elsewhere.
-   QString memo() const { return m_memo; }
+   QString memo() const;
 
    const graphene::chain::transfer_operation& operation() const { return m_op; }
    graphene::chain::transfer_operation& operation() { return m_op; }
@@ -101,14 +100,9 @@ public Q_SLOTS:
       m_op.amount.asset_id = arg;
       Q_EMIT amountTypeChanged();
    }
-   /// This does not deal with encrypted memos. The memo stored here is unencrypted, and does not get stored in the
+   /// This does not deal with encrypted memos. The memo stored here is unencrypted. The encryption step must be
-   /// underlying graphene operation. The encryption and storage steps must be handled elsewhere.
+   /// performed elsewhere.
-   void setMemo(QString memo) {
+   void setMemo(QString memo);
-      if (memo == m_memo)
-         return;
-      m_memo = memo;
-      Q_EMIT memoChanged();
-   }
 
 Q_SIGNALS:
    void feeChanged();
@@ -136,7 +130,7 @@ public:
    OperationBuilder(ChainDataModel& model, QObject* parent = nullptr)
       : QObject(parent), model(model){}
 
-   Q_INVOKABLE TransferOperation* transfer(ObjectId sender, ObjectId receiver,
+   Q_INVOKABLE TransferOperation* transfer(ObjectId sender, ObjectId receiver, qint64 amount,
-                                           qint64 amount, ObjectId amountType, QString memo, ObjectId feeType);
+                                           ObjectId amountType, QString memo, ObjectId feeType);
 
 };

programs/light_client/Transaction.cpp

@@ -43,6 +43,11 @@ OperationBase* Transaction::operationAt(int index) const {
 
 void Transaction::appendOperation(OperationBase* op)
 {
+   if (op == nullptr)
+   {
+      qWarning("Unable to append null operation to transaction");
+      return;
+   }
    op->setParent(this);
    m_transaction.operations.push_back(op->genericOperation());
    Q_EMIT operationsChanged();

programs/light_client/Transaction.hpp

@@ -50,6 +50,6 @@ private:
    Q_PROPERTY(Status status READ status WRITE setStatus NOTIFY statusChanged)
    Q_PROPERTY(QQmlListProperty<OperationBase> operations READ operations NOTIFY operationsChanged)
 
-   Status m_status;
+   Status m_status = Unbroadcasted;
    graphene::chain::transaction m_transaction;
 };

programs/light_client/main.cpp

@@ -20,6 +20,9 @@ QML_DECLARE_TYPE(Crypto)
 
 int main(int argc, char *argv[])
 {
+#ifndef NDEBUG
+   QQmlDebuggingEnabler enabler;
+#endif
    fc::thread::current().set_name("main");
    QApplication app(argc, argv);
    app.setApplicationName("Graphene Client");
@@ -28,6 +31,7 @@ int main(int argc, char *argv[])
 
    qRegisterMetaType<std::function<void()>>();
    qRegisterMetaType<ObjectId>();
+   qRegisterMetaType<QList<OperationBase*>>();
 
    qmlRegisterType<Asset>("Graphene.Client", 0, 1, "Asset");
    qmlRegisterType<Balance>("Graphene.Client", 0, 1, "Balance");
@@ -49,7 +53,6 @@ int main(int argc, char *argv[])
 #ifdef NDEBUG
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
 #else
-   QQmlDebuggingEnabler enabler;
    engine.load(QUrl(QStringLiteral("qml/main.qml")));
 #endif
 

programs/light_client/qml/FormBase.qml

@@ -0,0 +1,37 @@
+import QtQuick 2.5
+import QtQuick.Controls 1.4
+import QtQuick.Dialogs 1.2
+import QtQuick.Layouts 1.2
+
+import Graphene.Client 0.1
+
+import "."
+
+/**
+ * Base for all forms
+ *
+ * This base contains all of the properties, slots, and signals which all forms are expected to expose. It also
+ * automatically lays its children out in a ColumnLayout
+ */
+Rectangle {
+   anchors.fill: parent
+
+   /// Reference to the GrapheneApplication object
+   property GrapheneApplication app
+   /// Parent should trigger this signal to notify the form that it is about to be displayed
+   /// See specific form for the argument semantics
+   signal display(var arg)
+   /// Emitted when the form is canceled -- see specific form for the argument semantics
+   signal canceled(var arg)
+   /// Emitted when the form is completed -- see specific form for the argument semantics
+   signal completed(var arg)
+
+   default property alias childItems: childLayout.data
+
+   ColumnLayout {
+      id: childLayout
+      anchors.centerIn: parent
+      width: parent.width - Scaling.cm(2)
+      spacing: Scaling.mm(5)
+   }
+}

programs/light_client/qml/FormBox.qml

@@ -33,6 +33,8 @@ Rectangle {
       form.completed.connect(function(){state = "HIDDEN"; internal.callbackArgs = arguments})
       if (closedCallback instanceof Function)
          internal.callback = closedCallback
+      // Notify the form that it's about to go live
+      form.display({})
       state = "SHOWN"
    }
 

programs/light_client/qml/FormFlipper.qml

@@ -8,9 +8,10 @@ Flipable {
 
    property Component frontComponent
    property Component backComponent
-   property GrapheneApplication app
+
-   signal canceled
+   signal display(var arg)
-   signal completed
+   signal canceled(var arg)
+   signal completed(var arg)
 
    property bool flipped: false
 
@@ -19,13 +20,11 @@ Flipable {
       front = frontComponent.createObject(flipable, {app: app, enabled: Qt.binding(function(){return !flipped})})
       front.canceled.connect(function() { canceled.apply(this, arguments) })
       front.completed.connect(function() {
-         if (back.hasOwnProperty("arguments"))
+         back.display.apply(this, arguments)
-            back.arguments = arguments
          flipped = true
       })
       back.canceled.connect(function() {
-         if (front.hasOwnProperty("arguments"))
+         front.display.apply(this, arguments)
-            front.arguments = arguments
          flipped = false
       })
       back.completed.connect(function() { completed.apply(this, arguments) })
@@ -35,8 +34,10 @@ Flipable {
        id: rotation
        origin.x: flipable.width/2
        origin.y: flipable.height/2
-       axis.x: 0; axis.y: 1; axis.z: 0     // set axis.y to 1 to rotate around y-axis
+       // set axis.y to 1 to rotate around y-axis
-       angle: 0    // the default angle
+       axis.x: 0; axis.y: 1; axis.z: 0
+       // the default angle
+       angle: 0
    }
 
    states: State {

programs/light_client/qml/TransactionConfirmationForm.qml

@@ -0,0 +1,32 @@
+import QtQuick 2.5
+import QtQuick.Controls 1.4
+import QtQuick.Dialogs 1.2
+import QtQuick.Layouts 1.2
+
+import Graphene.Client 0.1
+
+import "."
+
+/**
+ * This is the form for previewing and approving a transaction prior to broadcasting it
+ *
+ * The arguments property should be populated with an Array of operations. These operations will be used to create a
+ * Transaction, display it, and get confirmation to sign and broadcast it. This form will populate the transaction with
+ * the operations and expiration details, sign it, and pass the signed transaction through the completed signal.
+ */
+FormBase {
+   id: base
+
+   property Transaction trx
+
+   Component.onCompleted: console.log("Made a transaction confirmation form")
+   Component.onDestruction: console.log("Destroyed a transaction confirmation form")
+
+   onDisplay: {
+      trx = app.createTransaction()
+      console.log(JSON.stringify(arg))
+      for (var op in arg)
+         trx.appendOperation(arg[op])
+      console.log(JSON.stringify(trx))
+   }
+}

programs/light_client/qml/TransferForm.qml

@@ -10,13 +10,8 @@ import "."
 /**
  * This is the form for transferring some amount of asset from one account to another.
  */
-Rectangle {
+FormBase {
-   id: root
+   id: base
-   anchors.fill: parent
-
-   property GrapheneApplication app
-   signal canceled
-   signal completed(TransferOperation op)
 
    /// The Account object for the sender
    property alias senderAccount: senderPicker.account
@@ -34,11 +29,6 @@ Rectangle {
    Component.onCompleted: console.log("Made a transfer form")
    Component.onDestruction: console.log("Destroyed a transfer form")
 
-   ColumnLayout {
-      anchors.centerIn: parent
-      width: parent.width - Scaling.cm(2)
-      spacing: Scaling.mm(5)
-
    AccountPicker {
       id: senderPicker
       // The senderPicker is really the heart of the form. Everything else in the form adjusts based on the account
@@ -47,7 +37,7 @@ Rectangle {
       // to have a maximum value equal to the account's balance in that asset. The transfer button enables only when
       // both accounts are set, and a nonzero amount is selected to be transferred.
 
-         app: root.app
+      app: base.app
       Layout.fillWidth: true
       Layout.minimumWidth: Scaling.cm(5)
       Component.onCompleted: setFocus()
@@ -60,7 +50,7 @@ Rectangle {
    }
    AccountPicker {
       id: recipientPicker
-         app: root.app
+      app: base.app
       Layout.fillWidth: true
       Layout.minimumWidth: Scaling.cm(5)
       placeholderText: qsTr("Recipient")
@@ -116,8 +106,7 @@ Rectangle {
          id: transferButton
          text: qsTr("Transfer")
          enabled: senderPicker.account && recipientPicker.account && senderPicker.account !== recipientPicker.account && amountField.value
-            onClicked: completed(operation)
+         onClicked: completed([operation()])
-         }
       }
    }
 }

programs/light_client/qml/main.qml

@@ -63,7 +63,7 @@ ApplicationWindow {
          onClicked: {
             var front = Qt.createComponent("TransferForm.qml")
             // TODO: make back into a preview and confirm dialog
-            var back = Qt.createComponent("TransferForm.qml")
+            var back = Qt.createComponent("TransactionConfirmationForm.qml")
             formBox.showForm(Qt.createComponent("FormFlipper.qml"), {frontComponent: front, backComponent: back},
                              function() {
                                 console.log("Closed form")

programs/light_client/qml/qml.qrc

@@ -1,7 +1,9 @@
 <RCC>
     <qresource prefix="/">
         <file>main.qml</file>
+        <file>FormBase.qml</file>
         <file>TransferForm.qml</file>
+        <file>TransactionConfirmationForm.qml</file>
         <file>FormBox.qml</file>
         <file>FormFlipper.qml</file>
         <file>Scaling.qml</file>