remember recent servers for quick reconfiguration

src/main/java/com/sparrowwallet/sparrow/AppServices.java

@@ -846,6 +846,7 @@ public class AppServices {
         addMempoolRateSizes(event.getMempoolRateSizes());
         minimumRelayFeeRate = event.getMinimumRelayFeeRate();
         latestBlockHeader = event.getBlockHeader();
+        Config.get().addRecentServer();
     }
 
     @Subscribe

src/main/java/com/sparrowwallet/sparrow/control/ComboBoxTextField.java

@@ -12,6 +12,8 @@ import org.controlsfx.control.textfield.CustomTextField;
 public class ComboBoxTextField extends CustomTextField {
     private final ObjectProperty<ComboBox<?>> comboProperty = new SimpleObjectProperty<>();
 
+    private boolean comboShowing;
+
     public ComboBoxTextField() {
         super();
         getStyleClass().add("combo-text-field");
@@ -26,8 +28,14 @@ public class ComboBoxTextField extends CustomTextField {
         showComboButtonPane.setCursor(Cursor.DEFAULT);
         showComboButtonPane.setOnMouseReleased(e -> {
             if(comboProperty.isNotNull().get()) {
+                if(comboShowing) {
+                    comboProperty.get().hide();
+                } else {
                     comboProperty.get().show();
                 }
+
+                comboShowing = !comboShowing;
+            }
         });
 
         rightProperty.set(showComboButtonPane);

src/main/java/com/sparrowwallet/sparrow/io/Config.java

@@ -13,10 +13,7 @@ import org.slf4j.LoggerFactory;
 
 import java.io.*;
 import java.lang.reflect.Type;
-import java.util.Arrays;
+import java.util.*;
-import java.util.Currency;
-import java.util.List;
-import java.util.Random;
 import java.util.stream.Collectors;
 
 public class Config {
@@ -52,10 +49,12 @@ public class Config {
     private ServerType serverType;
     private String publicElectrumServer;
     private String coreServer;
+    private List<String> recentCoreServers;
     private CoreAuthType coreAuthType;
     private File coreDataDir;
     private String coreAuth;
     private String electrumServer;
+    private List<String> recentElectrumServers;
     private File electrumServerCert;
     private boolean useProxy;
     private String proxyServer;
@@ -397,6 +396,23 @@ public class Config {
         flush();
     }
 
+    public List<String> getRecentCoreServers() {
+        return recentCoreServers;
+    }
+
+    public void addRecentCoreServer(String coreServer) {
+        if(recentCoreServers == null) {
+            recentCoreServers = new ArrayList<>();
+        }
+
+        if(!recentCoreServers.contains(coreServer)) {
+            recentCoreServers.stream().filter(url -> Objects.equals(Protocol.getHost(url), Protocol.getHost(coreServer)))
+                    .findFirst().ifPresent(existingUrl -> recentCoreServers.remove(existingUrl));
+            recentCoreServers.add(coreServer);
+            flush();
+        }
+    }
+
     public CoreAuthType getCoreAuthType() {
         return coreAuthType;
     }
@@ -433,6 +449,31 @@ public class Config {
         flush();
     }
 
+    public List<String> getRecentElectrumServers() {
+        return recentElectrumServers;
+    }
+
+    public void addRecentServer() {
+        if(serverType == ServerType.BITCOIN_CORE && coreServer != null) {
+            addRecentCoreServer(coreServer);
+        } else if(serverType == ServerType.ELECTRUM_SERVER && electrumServer != null) {
+            addRecentElectrumServer(electrumServer);
+        }
+    }
+
+    public void addRecentElectrumServer(String electrumServer) {
+        if(recentElectrumServers == null) {
+            recentElectrumServers = new ArrayList<>();
+        }
+
+        if(!recentElectrumServers.contains(electrumServer)) {
+            recentElectrumServers.stream().filter(url -> Objects.equals(Protocol.getHost(url), Protocol.getHost(electrumServer)))
+                    .findFirst().ifPresent(existingUrl -> recentElectrumServers.remove(existingUrl));
+            recentElectrumServers.add(electrumServer);
+            flush();
+        }
+    }
+
     public File getElectrumServerCert() {
         return electrumServerCert;
     }

src/main/java/com/sparrowwallet/sparrow/net/Protocol.java

@@ -144,4 +144,13 @@ public enum Protocol {
 
         return null;
     }
+
+    public static String getHost(String url) {
+        Protocol protocol = getProtocol(url);
+        if(protocol != null) {
+            return protocol.getServerHostAndPort(url).getHost();
+        }
+
+        return null;
+    }
 }

src/main/java/com/sparrowwallet/sparrow/preferences/ServerPreferencesController.java

@@ -6,6 +6,7 @@ import com.sparrowwallet.drongo.Network;
 import com.sparrowwallet.sparrow.AppServices;
 import com.sparrowwallet.sparrow.EventManager;
 import com.sparrowwallet.sparrow.Mode;
+import com.sparrowwallet.sparrow.control.ComboBoxTextField;
 import com.sparrowwallet.sparrow.control.TextFieldValidator;
 import com.sparrowwallet.sparrow.control.UnlabeledToggleSwitch;
 import com.sparrowwallet.sparrow.event.*;
@@ -23,6 +24,7 @@ import javafx.stage.DirectoryChooser;
 import javafx.stage.FileChooser;
 import javafx.stage.Stage;
 import javafx.util.Duration;
+import javafx.util.StringConverter;
 import org.berndpruenster.netlayer.tor.Tor;
 import org.controlsfx.control.SegmentedButton;
 import org.controlsfx.glyphfont.Glyph;
@@ -41,6 +43,7 @@ import java.io.FileInputStream;
 import java.security.cert.CertificateFactory;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.Random;
@@ -76,7 +79,10 @@ public class ServerPreferencesController extends PreferencesDetailController {
     private Form coreForm;
 
     @FXML
-    private TextField coreHost;
+    private ComboBox<String> recentCoreServers;
+
+    @FXML
+    private ComboBoxTextField coreHost;
 
     @FXML
     private TextField corePort;
@@ -115,7 +121,10 @@ public class ServerPreferencesController extends PreferencesDetailController {
     private Form electrumForm;
 
     @FXML
-    private TextField electrumHost;
+    private ComboBox<String> recentElectrumServers;
+
+    @FXML
+    private ComboBoxTextField electrumHost;
 
     @FXML
     private TextField electrumPort;
@@ -258,6 +267,29 @@ public class ServerPreferencesController extends PreferencesDetailController {
             }
         });
 
+        recentCoreServers.setConverter(new UrlHostConverter());
+        recentCoreServers.setItems(FXCollections.observableList(Config.get().getRecentCoreServers() == null ? new ArrayList<>() : Config.get().getRecentCoreServers()));
+        recentCoreServers.prefWidthProperty().bind(coreHost.widthProperty());
+        recentCoreServers.valueProperty().addListener((observable, oldValue, newValue) -> {
+            if(newValue != null && Protocol.getProtocol(newValue) != null) {
+                HostAndPort hostAndPort = Protocol.getProtocol(newValue).getServerHostAndPort(newValue);
+                coreHost.setText(hostAndPort.getHost());
+                corePort.setText(Integer.toString(hostAndPort.getPort()));
+            }
+        });
+
+        recentElectrumServers.setConverter(new UrlHostConverter());
+        recentElectrumServers.setItems(FXCollections.observableList(Config.get().getRecentElectrumServers() == null ? new ArrayList<>() : Config.get().getRecentElectrumServers()));
+        recentElectrumServers.prefWidthProperty().bind(electrumHost.widthProperty());
+        recentElectrumServers.valueProperty().addListener((observable, oldValue, newValue) -> {
+            if(newValue != null && Protocol.getProtocol(newValue) != null) {
+                HostAndPort hostAndPort = Protocol.getProtocol(newValue).getServerHostAndPort(newValue);
+                electrumHost.setText(hostAndPort.getHost());
+                electrumPort.setText(Integer.toString(hostAndPort.getPort()));
+                electrumUseSsl.setSelected(Protocol.getProtocol(newValue) == Protocol.SSL);
+            }
+        });
+
         electrumUseSsl.selectedProperty().addListener((observable, oldValue, newValue) -> {
             setElectrumServerInConfig(config);
             electrumCertificate.setDisable(!newValue);
@@ -507,6 +539,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
         publicProxyHost.setDisable(!editable);
         publicProxyPort.setDisable(!editable);
 
+        recentCoreServers.setVisible(editable);
         coreHost.setDisable(!editable);
         corePort.setDisable(!editable);
         coreAuthToggleGroup.getToggles().forEach(toggle -> ((ToggleButton)toggle).setDisable(!editable));
@@ -518,6 +551,7 @@ public class ServerPreferencesController extends PreferencesDetailController {
         coreProxyHost.setDisable(!editable);
         coreProxyPort.setDisable(!editable);
 
+        recentElectrumServers.setVisible(editable);
         electrumHost.setDisable(!editable);
         electrumPort.setDisable(!editable);
         electrumUseSsl.setDisable(!editable);
@@ -808,4 +842,16 @@ public class ServerPreferencesController extends PreferencesDetailController {
             }
         });
     }
+
+    private static class UrlHostConverter extends StringConverter<String> {
+        @Override
+        public String toString(String serverUrl) {
+            return serverUrl == null || Protocol.getProtocol(serverUrl) == null ? "" : Protocol.getProtocol(serverUrl).getServerHostAndPort(serverUrl).getHost();
+        }
+
+        @Override
+        public String fromString(String string) {
+            return null;
+        }
+    }
 }

src/main/resources/com/sparrowwallet/sparrow/preferences/server.fxml

@@ -16,9 +16,9 @@
 <?import com.sparrowwallet.sparrow.net.ServerType?>
 <?import com.sparrowwallet.sparrow.net.CoreAuthType?>
 <?import com.sparrowwallet.sparrow.control.HelpLabel?>
-<?import javafx.collections.FXCollections?>
-<?import com.sparrowwallet.sparrow.net.PublicElectrumServer?>
 <?import com.sparrowwallet.sparrow.control.CopyableLabel?>
+<?import com.sparrowwallet.sparrow.control.ComboBoxTextField?>
+
 <GridPane hgap="10.0" vgap="10.0" stylesheets="@preferences.css, @../general.css" xmlns="http://javafx.com/javafx/10.0.2-internal" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.sparrowwallet.sparrow.preferences.ServerPreferencesController">
     <padding>
         <Insets left="25.0" right="25.0" top="25.0" />
@@ -100,7 +100,10 @@
     <Form fx:id="coreForm" GridPane.columnIndex="0" GridPane.rowIndex="1">
         <Fieldset inputGrow="SOMETIMES" text="Bitcoin Core RPC">
             <Field text="URL:">
-                <TextField fx:id="coreHost" promptText="e.g. 127.0.0.1"/>
+                <StackPane>
+                    <ComboBox fx:id="recentCoreServers" />
+                    <ComboBoxTextField fx:id="coreHost" promptText="e.g. 127.0.0.1" comboProperty="$recentCoreServers" />
+                </StackPane>
                 <TextField fx:id="corePort" promptText="e.g. 8332" maxWidth="120" />
             </Field>
             <Field text="Authentication:">
@@ -147,7 +150,10 @@
     <Form fx:id="electrumForm" GridPane.columnIndex="0" GridPane.rowIndex="1">
         <Fieldset inputGrow="SOMETIMES" text="Private Electrum Server">
             <Field text="URL:">
-                <TextField fx:id="electrumHost" promptText="e.g. 127.0.0.1 or Tor hostname (.onion)"/>
+                <StackPane>
+                    <ComboBox fx:id="recentElectrumServers" />
+                    <ComboBoxTextField fx:id="electrumHost" promptText="e.g. 127.0.0.1 or Tor hostname (.onion)" comboProperty="$recentElectrumServers" />
+                </StackPane>
                 <TextField fx:id="electrumPort" promptText="e.g. 50002" maxWidth="120" />
             </Field>
             <Field text="Use SSL:">