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Another character-manipulation problem that we can use the library to solve succinctly is determining whether a word is a palindrome Palindromes are words that are spelled the same way front to back as back to front For example, "civic," "eye," "level," "madam," and "rotor" are all palindromes Here is a compact solution that uses the library:

Buttons provide a mechanism to initiate an action when clicked They generate a Selection event when pressed and released Buttons can display either strings or images as their contents Depending on their style settings, buttons can represent a number of common UI element types such as pushbuttons, checkboxes, radio buttons, toggle buttons, and arrow buttons Useful APIs include:

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 getSelection() Returns true if the receiver is selected and false

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The normal way for a class to allow a client to obtain an instance is to provide a public constructor There is another, less widely known technique that should also be a part of every programmer's toolkit A class can provide a public static factory method, which is simply a static method that returns an instance of the class Here's a simple example from the class Boolean (the wrapper class for the primitive type boolean) This static factory method, which was added in the 14 release, translates a boolean primitive value into a Boolean object reference:

bool is_palindrome(const string& s) { return equal(sbegin(), send(), srbegin()); }

42 SWT Widgets setImage(Image) Sets the receiver s image to the argument, which may be null, indicating that no image should be displayed

setSelection(boolean) Sets the selection state of the receiver if it is of type SWTCHECK, SWTRADIO, or SWTTOGGLE setText(String) Sets the receiver s text

The return statement in this function's body calls the equal function and the rbegin member function, both of which we have not yet seen Like begin, rbegin returns an iterator, but this time it is an iterator that starts with the last element in the container and marches backward through the container The equal function compares two sequences to determine whether they contain equal values As usual, the first two iterators passed to equal specify the first sequence The third argument is the starting point for the second sequence

Useful creation styles include:

The equal function assumes that the second sequence is the same size as the first, so it does not need an ending iterator Because we pass srbegin() as the starting point for the second sequence, the effect of this call is to compare values from the back of s to values in the front The equal function will compare the first character in s with the last Then it will compare the second to the next to last, and so on This behavior is precisely what we want

SWTARROW Creates an arrow button widget SWTCHECK Creates a checkbox widget SWTPUSH Creates a pushbutton widget SWTRADIO Creates a radio button widget SWTTOGGLE Creates a toggle button widget SWTUP Creates an upward-pointing arrow button SWTDOWN Creates a downward-pointing arrow button SWTLEFT Creates a leftward-pointing arrow button or left-justifies

public static Boolean valueOf(boolean b) { return (b BooleanTRUE : BooleanFALSE); }

SWTRIGHT Creates a rightward-pointing arrow button or rightjustifies the widget within its bounding box SWTCENTER Centers the widget within its bounding box

As the last of our examples of character manipulation, let's write a function that finds Web addresses, called uniform resource locators (URLs), that are embedded in a string We might use such a function by creating a single string that holds the entire contents of a document The function would then scan the document and find all the URLs in it A URL is a sequence of characters of the form protocol-name: //resource-name where protocol-name contains only letters, and resource-name may consist of letters, digits, and certain punctuation characters Our function will take a string argument and will look for instances of :// in that string Each time we find such an instance, we'll look for the protocol-name that precedes it, and the resource-name that follows it Because we want our function to find all the URLs in its input, we'll want it to return a vector<string>, with one element for each URL The function executes by moving the iterator b through the string, looking for the characters :// that might be a part of a URL If we find these characters, it looks backward to find the protocol-name, and it looks forward to find the resource-name:

The example code that follows (shown without a package statement) creates a window with a single pushbutton Clicking on the pushbutton will change the text of the button (see Figure 4 5)

import orgeclipseswt*; import orgeclipseswtevents*; import orgeclipseswtlayout*; import orgeclipseswtwidgets*;

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