Merge bitcoin-core/gui#109: wallet: Remove unused AskPassphraseDialog::Decrypt

4146a31 qt, wallet: Drop unused parameter in WalletModel::setWalletEncrypted (Hennadii Stepanov)
f886a20 qt, wallet: Drop unused parameter in Wallet{Frame|View}::encryptWallet (Hennadii Stepanov)
6e95011 qt, wallet: Remove unused AskPassphraseDialog::Decrypt (Hennadii Stepanov)

Pull request description:

  Grabbed from dashpay#42 with an additional commit.

  Fix #1.

ACKs for top commit:
  MarcoFalke:
    ACK 4146a31
  promag:
    Code review ACK 4146a31.

Tree-SHA512: 6070d8995525af826ad972cf1b8988ff98af0528eef285a07ec7ba0e2e92a7a6173a19dc371de94d4b437fa10f7921166e45a081de6ed2f4306e6502aafc94ee

Author: MarcoFalke

src/qt/askpassphrasedialog.cpp

@@ -73,14 +73,6 @@ AskPassphraseDialog::AskPassphraseDialog(Mode _mode, QWidget *parent, SecureStri
             ui->passEdit3->hide();
             setWindowTitle(tr("Unlock wallet"));
             break;
-        case Decrypt:   // Ask passphrase
-            ui->warningLabel->setText(tr("This operation needs your wallet passphrase to decrypt the wallet."));
-            ui->passLabel2->hide();
-            ui->passEdit2->hide();
-            ui->passLabel3->hide();
-            ui->passEdit3->hide();
-            setWindowTitle(tr("Decrypt wallet"));
-            break;
         case ChangePass: // Ask old passphrase + new passphrase x2
             setWindowTitle(tr("Change passphrase"));
             ui->warningLabel->setText(tr("Enter the old passphrase and new passphrase for the wallet."));
@@ -148,8 +140,7 @@ void AskPassphraseDialog::accept()
                                          "</b></qt>");
                 } else {
                     assert(model != nullptr);
-                    if(model->setWalletEncrypted(true, newpass1))
-                    {
+                    if (model->setWalletEncrypted(newpass1)) {
                         if (model->wallet().hdEnabled()) {
                             QMessageBox::warning(this, tr("Wallet encrypted"),
                                             "<qt>" +
@@ -171,9 +162,7 @@ void AskPassphraseDialog::accept()
                                             "will become useless as soon as you start using the new, encrypted wallet.") +
                                             "</b></qt>");
                         }
-                    }
-                    else
-                    {
+                    } else {
                         QMessageBox::critical(this, tr("Wallet encryption failed"),
                                              tr("Wallet encryption failed due to an internal error. Your wallet was not encrypted."));
                     }
@@ -207,17 +196,6 @@ void AskPassphraseDialog::accept()
             QMessageBox::critical(this, tr("Wallet unlock failed"), e.what());
         }
         break;
-    case Decrypt:
-        if(!model->setWalletEncrypted(false, oldpass))
-        {
-            QMessageBox::critical(this, tr("Wallet decryption failed"),
-                                  tr("The passphrase entered for the wallet decryption was incorrect."));
-        }
-        else
-        {
-            QDialog::accept(); // Success
-        }
-        break;
     case ChangePass:
         if(newpass1 == newpass2)
         {
@@ -253,9 +231,6 @@ void AskPassphraseDialog::textChanged()
         break;
     case UnlockMixing: // Old passphrase x1
     case Unlock: // Old passphrase x1
-    case Decrypt:
-        acceptable = !ui->passEdit1->text().isEmpty();
-        break;
     case ChangePass: // Old passphrase x1, new passphrase x2
         acceptable = !ui->passEdit1->text().isEmpty() && !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
         break;

src/qt/askpassphrasedialog.h

@@ -27,7 +27,6 @@ class AskPassphraseDialog : public QDialog
         UnlockMixing,     /**< Ask passphrase and unlock only for mixing */
         Unlock,     /**< Ask passphrase and unlock */
         ChangePass, /**< Ask old passphrase + new passphrase twice */
-        Decrypt     /**< Ask passphrase and decrypt wallet */
     };
 
     explicit AskPassphraseDialog(Mode mode, QWidget *parent, SecureString* passphrase_out = nullptr);

src/qt/walletmodel.cpp

@@ -368,12 +368,9 @@ WalletModel::EncryptionStatus WalletModel::getEncryptionStatus() const
     }
 }
 
-bool WalletModel::setWalletEncrypted(bool encrypted, const SecureString &passphrase)
+bool WalletModel::setWalletEncrypted(const SecureString& passphrase)
 {
-    if (encrypted) {
-        return m_wallet->encryptWallet(passphrase);
-    }
-    return false;
+    return m_wallet->encryptWallet(passphrase);
 }
 
 bool WalletModel::setWalletLocked(bool locked, const SecureString &passPhrase, bool fMixing)

src/qt/walletmodel.h

@@ -106,7 +106,7 @@ class WalletModel : public QObject
     SendCoinsReturn sendCoins(WalletModelTransaction &transaction, bool fIsCoinJoin);
 
     // Wallet encryption
-    bool setWalletEncrypted(bool encrypted, const SecureString &passphrase);
+    bool setWalletEncrypted(const SecureString& passphrase);
     // Passphrase only needed when unlocking
     bool setWalletLocked(bool locked, const SecureString &passPhrase=SecureString(), bool fMixing=false);
     bool changePassphrase(const SecureString &oldPass, const SecureString &newPass);