Chapter 5: Expressing Ideas

Just for something to do, I decided to clean up some code. Here s what happened ”not all of it good!

Something to Do

I think I ll refactor the code a bit, just for something to do. Let s take a look. Here s the method that handles Enter:

 public void Enter() { 
 int cursorLine = CursorLine(); 
 String[] newlines = new String[lines.Length+2]; 
 for(int i = 0; i <= cursorLine; i++)  { 
 newlines[i] = lines[i]; 
 } 
 newlines[cursorLine+1] = ""; 
 newlines[cursorLine+2] = "<P></P>"; 
 for (int i = cursorLine+1; i < lines.Length; i++) { 
 newlines[i+2] = lines[i]; 
 } 
 lines = newlines; 
 selectionStart = NewSelectionStart(cursorLine + 2); 
 } 

Here are some of the ideas that went into this code:

• Handle the Enter key.

• Change the lines table to include a blank line and a P tag line after the line that contains the cursor.

• Figure out which line contains the cursor.

• Copy the lines from the beginning through the cursor line to the output.

• Put a blank line into the output.

• Put a P tag line into the output.

• Copy the lines from after the cursor through the end to the output.

• Place the cursor in the middle of the P tag.

• Remember the output lines.

You might be wondering why I m mentioning the inclusion of the blank line and the P tag twice. The first mention is the purpose of the whole method. The second is a description of what some lines of code do.