[GUI] Add option to encrypt transfer memos

Also, refactor common unlocking finish/cancel buttons into a reusable
component

programs/light_client/Operations.cpp

@@ -28,12 +28,25 @@ TransferOperation* OperationBuilder::transfer(ObjectId sender, ObjectId receiver
 QString TransferOperation::memo() const {
    if (!m_op.memo)
       return QString::null;
+   if (memoIsEncrypted())
+      return tr("Encrypted Memo");
    QString memo = QString::fromStdString(m_op.memo->get_message({}, {}));
    while (memo.endsWith('\0'))
       memo.chop(1);
    return memo;
 }
 
+bool TransferOperation::memoIsEncrypted() const
+{
+   if (!m_op.memo)
+      return false;
+   if (m_op.memo->message.empty())
+      return false;
+   if (m_op.memo->from == public_key_type() && m_op.memo->to == public_key_type())
+      return false;
+   return true;
+}
+
 bool TransferOperation::canEncryptMemo(Wallet* wallet, ChainDataModel* model) const
 {
    if (!m_op.memo) return false;

programs/light_client/Operations.hpp

@@ -35,6 +35,7 @@ class TransferOperation : public OperationBase {
    Q_PROPERTY(qint64 amount READ amount WRITE setAmount NOTIFY amountChanged)
    Q_PROPERTY(ObjectId amountType READ amountType WRITE setAmountType NOTIFY amountTypeChanged)
    Q_PROPERTY(QString memo READ memo WRITE setMemo NOTIFY memoChanged)
+   Q_PROPERTY(bool memoIsEncrypted READ memoIsEncrypted NOTIFY memoChanged)
 
    graphene::chain::transfer_operation m_op;
 
@@ -60,6 +61,7 @@ public:
    /// performed by calling encryptMemo()
    QString memo() const;
 
+   bool memoIsEncrypted()const;
    Q_INVOKABLE bool canEncryptMemo(Wallet* wallet, ChainDataModel* model) const;
    Q_INVOKABLE bool canDecryptMemo(Wallet* wallet, ChainDataModel* model) const;
    Q_INVOKABLE QString decryptedMemo(Wallet* wallet, ChainDataModel* model) const;

programs/light_client/qml/TransactionConfirmationForm.qml

@@ -62,36 +62,19 @@ FormBase {
    Loader {
       sourceComponent: trx && Array.prototype.slice.call(trx.operations).length > 0? transactionDelegate : undefined
    }
-   RowLayout {
+   UnlockingFinishButtons {
+      app: base.app
       Layout.fillWidth: true
-      Item { Layout.fillWidth: true }
-      Button {
-         text: qsTr("Cancel")
-         onClicked: {
-            canceled({})
-            trx = null
-         }
+      onLeftButtonClicked: {
+         canceled({})
+         trx = null
       }
-      TextField {
-         id: passwordField
-         Layout.preferredWidth: app.wallet.isLocked? Scaling.cm(4) : 0
-         echoMode: TextInput.Password
-         placeholderText: qsTr("Wallet password")
-         visible: width > 0
-         onAccepted: finishButton.clicked()
-
-         Behavior on Layout.preferredWidth { NumberAnimation { duration: 200; easing.type: Easing.InOutQuad } }
-      }
-      Button {
-         id: finishButton
-         text: app.wallet.isLocked? qsTr("Unlock") : qsTr("Finish")
-         onClicked: {
-            if (app.wallet.isLocked)
-               app.wallet.unlock(passwordField.text)
-            else {
-               app.wallet.sign(trx)
-               completed(trx)
-            }
+      onRightButtonClicked: {
+         if (app.wallet.isLocked)
+            app.wallet.unlock(passwordField.text)
+         else {
+            app.wallet.sign(trx)
+            completed(trx)
          }
       }
    }

programs/light_client/qml/TransferForm.qml

@@ -1,6 +1,5 @@
 import QtQuick 2.5
 import QtQuick.Controls 1.4
-import QtQuick.Dialogs 1.2
 import QtQuick.Layouts 1.2
 
 import Graphene.Client 0.1
@@ -19,7 +18,7 @@ FormBase {
    property alias receiverAccount: recipientPicker.account
 
    function operation() {
-      if (!transferButton.enabled) return app.operationBuilder.transfer(0,0,0,0, memoField.text, 0)
+      if (!finishLine.rightButtonEnabled) return app.operationBuilder.transfer(0,0,0,0, memoField.text, 0)
 
       return app.operationBuilder.transfer(senderPicker.account.id, recipientPicker.account.id,
                                            amountField.value * amountField.precisionAdjustment,
@@ -56,10 +55,18 @@ FormBase {
       placeholderText: qsTr("Recipient")
       layoutDirection: Qt.RightToLeft
    }
-   TextField {
-      id: memoField
+   RowLayout {
       Layout.fillWidth: true
-      placeholderText: qsTr("Memo")
+      TextField {
+         id: memoField
+         Layout.fillWidth: true
+         placeholderText: qsTr("Memo")
+      }
+      CheckBox {
+         id: encryptMemoField
+         text: qsTr("Encrypt Memo")
+         checked: true
+      }
    }
    RowLayout {
       Layout.fillWidth: true
@@ -97,18 +104,25 @@ FormBase {
             return qsTr("Fee:<br/>") + amountField.maxBalance.type.formatAmount(operation().fee) + " CORE"
          }
       }
-      Item { Layout.fillWidth: true }
-      Button {
-         text: qsTr("Cancel")
-         onClicked: canceled({})
-      }
-      Button {
-         id: transferButton
-         text: !senderAccount ||
+   }
+   UnlockingFinishButtons {
+      id: finishLine
+      app: base.app
+      rightButtonText: {
+         return !senderAccount ||
                !senderAccount.isLoaded ||
                senderPicker.accountControlLevel >= 1? qsTr("Transfer") : qsTr("Propose")
-         enabled: senderPicker.account && recipientPicker.account && senderPicker.account !== recipientPicker.account && amountField.value
-         onClicked: completed([operation()])
+      }
+      rightButtonEnabled: senderPicker.account && recipientPicker.account && senderPicker.account !== recipientPicker.account && amountField.value
+      requiresUnlocking: encryptMemoField.checked
+      Layout.fillWidth: true
+
+      onLeftButtonClicked: canceled({})
+      onRightButtonClicked: {
+         var op = operation()
+         if (encryptMemoField.checked)
+            op.encryptMemo(app.wallet, app.model)
+         completed([op])
       }
    }
 }

programs/light_client/qml/UnlockingFinishButtons.qml

@@ -0,0 +1,50 @@
+import QtQuick 2.5
+import QtQuick.Controls 1.4
+import QtQuick.Layouts 1.2
+
+import "."
+
+import Graphene.Client 0.1
+
+RowLayout {
+   property string leftButtonText: qsTr("Cancel")
+   property string unlockButtonText: qsTr("Unlock")
+   property string rightButtonText: qsTr("Finish")
+   property bool leftButtonEnabled: true
+   property bool rightButtonEnabled: true
+   property bool requiresUnlocking: true
+   property GrapheneApplication app
+
+   signal leftButtonClicked
+   signal rightButtonClicked
+
+   Item { Layout.fillWidth: true }
+   Button {
+      text: leftButtonText
+      onClicked: leftButtonClicked()
+   }
+   TextField {
+      id: passwordField
+      property bool shown: requiresUnlocking && app.wallet.isLocked
+      property real desiredWidth: shown? Scaling.cm(4) : 0
+      Layout.preferredWidth: desiredWidth
+      echoMode: TextInput.Password
+      placeholderText: qsTr("Wallet password")
+      visible: desiredWidth > 0
+      onAccepted: rightButton.clicked()
+
+      Behavior on desiredWidth { NumberAnimation { duration: 200; easing.type: Easing.InOutQuad } }
+   }
+   Button {
+      id: rightButton
+      text: passwordField.shown? unlockButtonText : rightButtonText
+      enabled: rightButtonEnabled
+      onClicked: {
+         if (passwordField.visible)
+            return app.wallet.unlock(passwordField.text)
+
+         rightButtonClicked()
+      }
+      Behavior on implicitWidth { NumberAnimation {} }
+   }
+}

programs/light_client/qml/qml.qrc

@@ -6,6 +6,7 @@
         <file>TransactionConfirmationForm.qml</file>
         <file>FormBox.qml</file>
         <file>FormFlipper.qml</file>
+        <file>UnlockingFinishButtons.qml</file>
         <file>Scaling.qml</file>
         <file>Identicon.qml</file>
         <file>AccountPicker.qml</file>