editor size limit

java_console/ui/src/main/java/com/rusefi/ui/lua/DocumentSizeFilter.java

@@ -0,0 +1,78 @@
+package com.rusefi.ui.lua;
+
+
+/*
+ * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *   - Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ *   - Neither the name of Oracle or the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/* A 1.4 class used by TextComponentDemo.java. */
+
+import javax.swing.text.AttributeSet;
+import javax.swing.text.BadLocationException;
+import javax.swing.text.DocumentFilter;
+import java.awt.*;
+
+public class DocumentSizeFilter extends DocumentFilter {
+    int maxCharacters;
+
+    public DocumentSizeFilter(int maxChars) {
+        maxCharacters = maxChars;
+    }
+
+    public void insertString(FilterBypass fb, int offs,
+                             String str, AttributeSet a)
+            throws BadLocationException {
+
+        //This rejects the entire insertion if it would make
+        //the contents too long. Another option would be
+        //to truncate the inserted string so the contents
+        //would be exactly maxCharacters in length.
+        if ((fb.getDocument().getLength() + str.length()) <= maxCharacters)
+            super.insertString(fb, offs, str, a);
+        else
+            Toolkit.getDefaultToolkit().beep();
+    }
+
+    public void replace(FilterBypass fb, int offs,
+                        int length,
+                        String str, AttributeSet a)
+            throws BadLocationException {
+        //This rejects the entire replacement if it would make
+        //the contents too long. Another option would be
+        //to truncate the replacement string so the contents
+        //would be exactly maxCharacters in length.
+        if ((fb.getDocument().getLength() + str.length()
+                - length) <= maxCharacters)
+            super.replace(fb, offs, length, str, a);
+        else
+            Toolkit.getDefaultToolkit().beep();
+    }
+}

java_console/ui/src/main/java/com/rusefi/ui/lua/TextEditor.java

@@ -1,10 +1,16 @@
 package com.rusefi.ui.lua;
 
+import com.rusefi.config.generated.Fields;
+
 import javax.swing.*;
+import javax.swing.event.DocumentEvent;
+import javax.swing.event.DocumentListener;
+import javax.swing.text.AbstractDocument;
 import javax.swing.text.Document;
 import javax.swing.undo.CannotRedoException;
 import javax.swing.undo.CannotUndoException;
 import javax.swing.undo.UndoManager;
+import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.InputEvent;
 import java.awt.event.KeyEvent;
@@ -15,14 +21,44 @@ import java.awt.event.KeyEvent;
  * todo: Find text feature?
  */
 public class TextEditor {
+    private final JPanel area = new JPanel(new BorderLayout());
     private final JTextArea textArea = new JTextArea();
+    private final JLabel sizeLabel = new JLabel();
 
     public TextEditor() {
         textArea.setTabSize(2);
 
+        AbstractDocument pDoc = (AbstractDocument) textArea.getDocument();
+        pDoc.setDocumentFilter(new DocumentSizeFilter(Fields.LUA_SCRIPT_SIZE));
+        pDoc.addDocumentListener(new DocumentListener() {
+            @Override
+            public void insertUpdate(DocumentEvent e) {
+                updateSize();
+            }
+
+            @Override
+            public void removeUpdate(DocumentEvent e) {
+                updateSize();
+            }
+
+            @Override
+            public void changedUpdate(DocumentEvent e) {
+                updateSize();
+            }
+        });
+
+        area.add(textArea, BorderLayout.CENTER);
+        JPanel bottomArea = new JPanel(new FlowLayout(FlowLayout.RIGHT));
+        area.add(bottomArea, BorderLayout.SOUTH);
+        bottomArea.add(sizeLabel);
+
         installUndoRedoKeystrokes();
     }
 
+    private void updateSize() {
+        sizeLabel.setText(textArea.getText().length() + "/" + Fields.LUA_SCRIPT_SIZE);
+    }
+
     private void installUndoRedoKeystrokes() {
         KeyStroke undoKeyStroke = KeyStroke.getKeyStroke(
                 KeyEvent.VK_Z, InputEvent.CTRL_MASK);
@@ -62,8 +98,8 @@ public class TextEditor {
         });
     }
 
-    public JTextArea getControl() {
-        return textArea;
+    public JComponent getControl() {
+        return area;
     }
 
     public void setText(String text) {