Make text monitor output area font size dynamically adjustable

Add CTRL +/- and CTRL scroll shortcuts to increase/decrease serial/network monitor output text size. This font size is shared with the editor and adjusting either will update both.
Partially fixes #8615

app/src/cc/arduino/packages/MonitorFactory.java

@@ -30,23 +30,24 @@
 package cc.arduino.packages;
 
 import processing.app.AbstractMonitor;
+import processing.app.Base;
 import processing.app.NetworkMonitor;
 import processing.app.SerialMonitor;
 
 public class MonitorFactory {
 
-  public AbstractMonitor newMonitor(BoardPort port) {
+  public AbstractMonitor newMonitor(Base base, BoardPort port) {
     if ("network".equals(port.getProtocol())) {
       if ("yes".equals(port.getPrefs().get("ssh_upload"))) {
         // the board is SSH capable
-        return new NetworkMonitor(port); 
+        return new NetworkMonitor(base, port); 
       } else {
         // SSH not supported, no monitor support
         return null;
       }
     }
 
-    return new SerialMonitor(port);
+    return new SerialMonitor(base, port);
   }
 
 }

app/src/processing/app/AbstractMonitor.java

@@ -173,4 +173,13 @@ public abstract class AbstractMonitor extends JFrame implements ActionListener {
       message(s);
     }
   }
+
+  /**
+   * Read and apply new values from the preferences, either because
+   * the app is just starting up, or the user just finished messing
+   * with things in the Preferences window.
+   */
+  public void applyPreferences() {
+    // Empty.
+  };
 }

app/src/processing/app/AbstractTextMonitor.java

@@ -8,6 +8,9 @@ import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyAdapter;
+import java.awt.event.MouseWheelEvent;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import java.text.SimpleDateFormat;
@@ -32,6 +35,8 @@ import cc.arduino.packages.BoardPort;
 @SuppressWarnings("serial")
 public abstract class AbstractTextMonitor extends AbstractMonitor {
 
+  private final Base base;
+
   protected JLabel noLineEndingAlert;
   protected TextAreaFIFO textArea;
   protected JScrollPane scrollPane;
@@ -43,14 +48,12 @@ public abstract class AbstractTextMonitor extends AbstractMonitor {
   protected JComboBox lineEndings;
   protected JComboBox serialRates;
 
-  public AbstractTextMonitor(BoardPort boardPort) {
+  public AbstractTextMonitor(Base base, BoardPort boardPort) {
     super(boardPort);
+    this.base = base;
   }
 
   protected void onCreateWindow(Container mainPane) {
-    Font consoleFont = Theme.getFont("console.font");
-    Font editorFont = PreferencesData.getFont("editor.font");
-    Font font = Theme.scale(new Font(consoleFont.getName(), consoleFont.getStyle(), editorFont.getSize()));
 
     mainPane.setLayout(new BorderLayout());
 
@@ -58,12 +61,45 @@ public abstract class AbstractTextMonitor extends AbstractMonitor {
     textArea.setRows(16);
     textArea.setColumns(40);
     textArea.setEditable(false);
-    textArea.setFont(font);
 
     // don't automatically update the caret.  that way we can manually decide
     // whether or not to do so based on the autoscroll checkbox.
     ((DefaultCaret) textArea.getCaret()).setUpdatePolicy(DefaultCaret.NEVER_UPDATE);
 
+    // Add "CTRL scroll" hotkey for font size adjustment.
+    textArea.addMouseWheelListener((MouseWheelEvent e) -> {
+      if (e.isControlDown()) {
+        if (e.getWheelRotation() < 0) {
+          base.handleFontSizeChange(1);
+        } else {
+          base.handleFontSizeChange(-1);
+        }
+      } else {
+        e.getComponent().getParent().dispatchEvent(e);
+      }
+    });
+
+    // Add "CTRL (SHIFT) =/+" and "CTRL -" hotkeys for font size adjustment.
+    textArea.addKeyListener(new KeyAdapter() {
+      @Override
+      public void keyPressed(KeyEvent e) {
+        if (e.getModifiersEx() == KeyEvent.CTRL_DOWN_MASK
+            || e.getModifiersEx() == (KeyEvent.CTRL_DOWN_MASK | KeyEvent.SHIFT_DOWN_MASK)) {
+          switch (e.getKeyCode()) {
+            case KeyEvent.VK_PLUS:
+            case KeyEvent.VK_EQUALS:
+              base.handleFontSizeChange(1);
+              break;
+            case KeyEvent.VK_MINUS:
+              if (!e.isShiftDown()) {
+                base.handleFontSizeChange(-1);
+              }
+              break;
+          }
+        }
+      }
+    });
+
     scrollPane = new JScrollPane(textArea);
 
     mainPane.add(scrollPane, BorderLayout.CENTER);
@@ -110,12 +146,6 @@ public abstract class AbstractTextMonitor extends AbstractMonitor {
         noLineEndingAlert.setForeground(pane.getBackground());
       }
     });
-    if (PreferencesData.get("serial.line_ending") != null) {
-      lineEndings.setSelectedIndex(PreferencesData.getInteger("serial.line_ending"));
-    }
-    if (PreferencesData.get("serial.show_timestamp") != null) {
-      addTimeStampBox.setSelected(PreferencesData.getBoolean("serial.show_timestamp"));
-    }
     addTimeStampBox.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
         PreferencesData.setBoolean("serial.show_timestamp", addTimeStampBox.isSelected());
@@ -142,6 +172,8 @@ public abstract class AbstractTextMonitor extends AbstractMonitor {
     pane.add(Box.createRigidArea(new Dimension(8, 0)));
     pane.add(clearButton);
 
+    applyPreferences();
+
     mainPane.add(pane, BorderLayout.SOUTH);
   }
 
@@ -189,6 +221,26 @@ public abstract class AbstractTextMonitor extends AbstractMonitor {
     }
   }
 
+  @Override
+  public void applyPreferences() {
+
+    // Apply font.
+    Font consoleFont = Theme.getFont("console.font");
+    Font editorFont = PreferencesData.getFont("editor.font");
+    textArea.setFont(Theme.scale(new Font(
+        consoleFont.getName(), consoleFont.getStyle(), editorFont.getSize())));
+
+    // Apply line endings.
+    if (PreferencesData.get("serial.line_ending") != null) {
+      lineEndings.setSelectedIndex(PreferencesData.getInteger("serial.line_ending"));
+    }
+
+    // Apply timestamp visibility.
+    if (PreferencesData.get("serial.show_timestamp") != null) {
+      addTimeStampBox.setSelected(PreferencesData.getBoolean("serial.show_timestamp"));
+    }
+  }
+
   private String addTimestamps(String text) {
     String now = new SimpleDateFormat("HH:mm:ss.SSS -> ").format(new Date());
     final StringBuilder sb = new StringBuilder(text.length() + now.length());

app/src/processing/app/Editor.java

@@ -495,6 +495,9 @@ public class Editor extends JFrame implements RunnerListener {
       tab.applyPreferences();
     }
     console.applyPreferences();
+    if (serialMonitor != null) {
+      serialMonitor.applyPreferences();
+    }
   }
 
 
@@ -2211,7 +2214,7 @@ public class Editor extends JFrame implements RunnerListener {
       return;
     }
 
-    serialMonitor = new MonitorFactory().newMonitor(port);
+    serialMonitor = new MonitorFactory().newMonitor(base, port);
 
     if (serialMonitor == null) {
       String board = port.getPrefs().get("board");

app/src/processing/app/NetworkMonitor.java

@@ -31,8 +31,8 @@ public class NetworkMonitor extends AbstractTextMonitor implements MessageConsum
   private Channel channel;
   private int connectionAttempts;
 
-  public NetworkMonitor(BoardPort port) {
+  public NetworkMonitor(Base base, BoardPort port) {
-    super(port);
+    super(base, port);
 
     onSendCommand(new ActionListener() {
       public void actionPerformed(ActionEvent event) {

app/src/processing/app/SerialMonitor.java

@@ -33,8 +33,8 @@ public class SerialMonitor extends AbstractTextMonitor {
   private Serial serial;
   private int serialRate;
 
-  public SerialMonitor(BoardPort port) {
+  public SerialMonitor(Base base, BoardPort port) {
-    super(port);
+    super(base, port);
 
     serialRate = PreferencesData.getInteger("serial.debug_rate");
     serialRates.setSelectedItem(serialRate + " " + tr("baud"));