second big push. Now there is an editor.

CompiledSketches/.gitignore

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+
+SketchFromP5NitroEditor

P5Nitro/Cursor.java

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+public class Cursor {
+
+  int cursorChar = 0, cursorLine = 0;
+  public TextArea textArea;
+  float cursorX = 0;
+
+  public Cursor(TextArea textArea){
+    this.textArea = textArea;
+  }
+
+  public void advanceCursorByWord() {
+
+    int currentLineLength = textArea.currentLine().length();
+
+    int c = cursorChar;
+    if(cursorChar == currentLineLength) {
+      if(changeLine(1)) {
+        cursorChar = 0;
+      }
+      return;
+    }
+    if(textArea.currentLine().charAt(c) == ' ') {
+      c++;
+    }
+    while(c < currentLineLength) {
+      if(textArea.currentLine().charAt(c) == ' ') {
+        break;
+      }
+      c++;
+    }
+    cursorChar = c;
+  }
+
+  void resetCursorPosition() {
+     cursorChar = 0;
+     cursorLine = 0;
+  }
+
+  public void retreatCursorByChar() {
+
+    if(cursorChar > 0) {
+      cursorChar--;
+    } 
+    else if(cursorChar == 0) {
+      if(changeLine(-1)) {
+        cursorChar = textArea.currentLine().length();
+      }
+    }
+  }
+
+  public void retreatCursorByWord() {
+
+    int c = cursorChar - 1;
+    if(cursorChar == 0) {
+      if(changeLine(-1)) {
+        cursorChar = textArea.currentLine().length();
+      }
+      return;
+    }
+    if(textArea.currentLine().charAt(c - 1) == ' ') {
+      c--;
+    }
+    while(c > 0) {
+      if(textArea.currentLine().charAt(c - 1)  == ' ') {
+        break;
+      }
+      c--;
+    }
+    cursorChar = c;
+  }
+
+
+  public boolean changeLine(int byLines) {
+
+    if(byLines > 0 && cursorLine + byLines > textArea.nonWrappingLinesArrayList.size() - 1) {
+      return false;
+    } 
+    else if(byLines < 0 && cursorLine + byLines < 0) {
+      return false;
+    }
+    cursorLine += byLines;
+
+    int currentLineLength = textArea.currentLine().length();
+
+    if(cursorChar > currentLineLength) {
+      cursorChar = currentLineLength;
+    }
+    return true;
+  }
+
+  public void advanceCursorByChar() {
+
+    int currentLineLength = textArea.currentLine().length();
+
+    if(cursorChar < currentLineLength) {
+      cursorChar++;
+    } 
+    else if(cursorChar == currentLineLength) {
+      if(changeLine(1)) {
+        cursorChar = 0;
+      }
+    }
+  }
+
+
+  public void updateCursorPosition() {
+    String stringBeforeCaret = (new String((StringBuffer)textArea.nonWrappingLinesArrayList.get(cursorLine))).substring(0,cursorChar);
+    //cursorX = (float)textArea.p.textWidth(stringBeforeCaret) * textArea.scalingFactor;
+    cursorX = (float)textArea.p.textWidth(stringBeforeCaret);
+
+    // this is faster with monospaced fonts:
+    // cursorX = (float)p.textWidth("a") * (float)theCursor.cursorChar * scalingFactor;
+  }
+
+}