Javaв„ў EE 5 Tutorial, The (3rd Edition)

using System; using System.Collections; using System.Text; namespace Notepad { class TextModel { private ArrayList lines; private int selectionStart; public TextModel() { lines = new ArrayList(); } public void InsertControlPText() { } private int LineContainingCursor() { int length = 0; int lineNr = 0; int cr = Environment.NewLine.Length; foreach ( String s in lines) { if (length <= selectionStart && selectionStart < length+s.Length + cr ) break; length += s.Length + cr; lineNr++; } return lineNr; } public void Enter() { InsertParagraphTag(); } public void InsertParagraphTag() { // // On Enter, we change the TextModel lines to insert, after the line // containing the cursor, a blank line, and a line with < P >< /P > . We set // the new cursor location to be between the P tags: < P > < /P > . // // handle empty array special case (yucch) if ( lines.Count == 0 ) { lines.Add( "<P></P>" ); selectionStart = 3; return; } lines.InsertRange(LineContainingCursor()+1, NewParagraph()); // set cursor location selectionStart = NewSelectionStart(LineContainingCursor() + 2); } private int NewSelectionStart(int cursorLine) { int length = 0; for (int i = 0; i < cursorLine; i++) length += ((String)lines[i]).Length + Environment.NewLine.Length; return length + "<p>".Length; } public ArrayList LinesThroughCursor() { return lines.GetRange(0,LineContainingCursor()+1); } public ArrayList NewParagraph() { ArrayList temp = new ArrayList(); temp.Add(""); temp.Add("<P></P>"); return temp; } public ArrayList LinesAfterCursor() { int cursorLine = LineContainingCursor(); return lines.GetRange(cursorLine+1,lines.Count - cursorLine - 1); } public String[] Lines { get { return (String[]) lines.ToArray(typeof(String)); } set { lines = new ArrayList(value); } } public String TestText { get { StringBuilder b = new StringBuilder(); foreach(String s in lines) { b.Append(s); b.Append(System.Environment.NewLine); } b.Insert(SelectionStart,""); return b.ToString(); } } public int SelectionStart { get { return selectionStart; } set { selectionStart = value; } } } } using System; using Nunit.Framework; namespace Notepad { [TestFixture] public class TestTextModel : Assertion { private TextModel model; [SetUp] public void CreateModel() { model = new TextModel(); } [Test] public void TestNoLines() { model.Lines = new String[0]; AssertEquals(0, model.Lines.Length); } [Test] public void TestNoProcessing() { model.Lines = new String[3] { "hi", "there", "chet"}; AssertEquals(3, model.Lines.Length); } [Test] public void TestOneEnter() { model.Lines = new String[1] {"hello world" }; model.SelectionStart = 5; model.InsertParagraphTag(); AssertEquals(3, model.Lines.Length); AssertEquals(18, model.SelectionStart); } [Test] public void TestEmptyText() { model.Lines = new String[0]; model.InsertParagraphTag(); AssertEquals(1, model.Lines.Length); AssertEquals(3, model.SelectionStart); } // Chet comments that he hates the comments [Test] public void InsertWithCursorAtLineStart () { model.Lines = new String[3] { "<P>one</P>", "", "<P>two</P>"}; model.SelectionStart = 14; model.InsertParagraphTag(); AssertEquals("<P>two</P>", model.Lines[2]); } [Test] public void TestLineContainingCursorDirectly() { // todo? } } }