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vector<string> find_urls(const string& s) { vector<string> ret; typedef string::const_iterator iter; iter b = sbegin(), e = send(); // look through the entire input while (b != e) { // look for one or more letters followed by :// b = url_beg(b, e); // if we found it if (b != e) { // get the rest of the URL iter after = url_end(b, e); // remember the URL retpush_back(string(b, after)); // advance b and check for more URLs on this line b = after; } } return ret; }

public class ButtonExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Button Example"); shellsetBounds(100, 100, 200, 100); shellsetLayout(new FillLayout()); final Button button = new Button(shell, SWTPUSH); buttonsetText("Click Me Now"); buttonaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { buttonsetText("I Was Clicked"); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }

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We start by declaring ret, which is the vector into which we will put the URLs as we find them, and by obtaining iterators that delimit the string We will have to write the url_beg and url_end functions, which will find the beginning and end of any URL in the input The url_beg function will be responsible for identifying whether a valid URL is present and, if so, for returning an iterator that refers to the first character of the protocol-name If it does not identify a URL in the input, then it will return its second argument (e in this case) to indicate failure If url_beg finds a URL, the next task is to find the end of the URL by calling url_end That function will search from the given position until it reaches either the end of the input or a character that cannot be part of a URL It will return

Relative to the first example in this chapter, the interesting lines in the preceding example are highlighted in bold After the creation of the button, a selection listener is added in which a SelectionAdapter is created that overrides the widgetSelected() method

Text widgets provide text viewing and editing capabilities If the user enters more text than can be accommodated within the widget, it will automatically scroll Useful APIs include:

an iterator positioned one past the last character in the URL Thus, after the calls to url_beg and url_end, the iterator b denotes the beginning of a URL, and the iterator after denotes the position one past the last character in the URL:

addModifyListener(ModifyListener) Adds the listener to the collection of listeners that will be notified when the receiver s text is modified by sending it one of the messages defined in the ModifyListener interface addSelectionListener(SelectionListener) Adds the listener to the collection of listeners that will be notified when the control is selected by sending it one of the messages defined in the SelectionListener interface

addVerifyListener(VerifyListener) Adds the listener to the collection of listeners that will be notified when the receiver s text is verified by sending it one of the messages defined in the VerifyListener interface A verify event occurs after the user has done something to modify the text (typically typed a key), but before the text is modified clearSelection() Clears the selection copy() Copies the selected text cut() Cuts the selected text getSelectionText() Gets the selected text getText() Gets the widget text getText(int start, int end) Gets a range of text insert(String) Inserts a string paste() Pastes text from the clipboard selectAll() Selects all the text in the receiver setEchoChar(char echo) Sets the echo character setEditable(boolean editable) Sets the editable state setSelection(int start, int end) Sets the selection setText(String) Sets the contents of the receiver to the given string setTextLimit(int) Sets the maximum number of characters that the receiver is capable of holding to be the argument setTopIndex(int) Sets the zero-relative index of the line that is cur-

We construct a new string from the characters in this range, and push that string onto the back of ret All that remains is to increment the value of b and to look for the next URL Because URLs cannot overlap one another, we set b to (one past) the end of the URL that we just found, and continue the while loop until we've looked at all the input Once that loop exits, we return the vector that contains the URLs to our caller Now we have to think about url_beg and url_end The url_end function is simpler, so we'll start there:

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