.NET/Java PDF, Tiff, Barcode SDK Library

Breaking a string over multiple lines does not affect the result. From the C++ compiler s viewpoint, Tip the string "foo" line break "bar" is identical to the string "foobar". Sometimes it is handy to be able to break down a line because it can be used to increase the readability or simply to fit the code onto the paper when printing it.

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If you look through the code for this page, you ll find the markup for the Login button. It looks like this: <input type="button" class="button affirmative" id="loginBtn" onclick="return OnLogin();" value="Login" /> You can see that when you click this button, it calls the return Onlogin(); script. Let s take a look at that:

// Run the turtle for the specified duration // Returns false if there was a failure // Or true if the run succeeded public bool RunFor(double duration) { if (LeftMotorState == MotorState.Stopped && RightMotorState == MotorState.Stopped) { // If we are at a full stop, nothing will happen return true; } // The motors are both // then we just drive if ((LeftMotorState == RightMotorState == (LeftMotorState == RightMotorState == { Drive(duration); return true; } // // // if running in the same direction MotorState.Running && MotorState.Running) || MotorState.Reversed && MotorState.Reversed))

{ }

The motors are running in opposite directions, so we don't move, we just rotate about the center of the rig ((LeftMotorState == MotorState.Running && RightMotorState == MotorState.Reversed) || (LeftMotorState == MotorState.Reversed && RightMotorState == MotorState.Running)) return Rotate(duration);

Although it is possible to represent new-lines with the <br /> HTML tag, Qt actually supports many HTML tags that can make formatting tooltips much easier. Listing 9-3 shows some of the formatting that is possible. The resulting tooltip is shown in Figure 9-2. Listing 9-3. An HTML-formatted tooltip label->setToolTip( tr("<p>It is possible to do lists.</p>" "<ul>" "<li>You can <i>format</i> text.</li>" "<li><b>Bold</b> is possible too.</li>" "<li>And the <font color='#22aaff'>color</font> and " "<font size='+2'>size</font>.</li>" "</ul>" "<p>You can do ordered lists as well.</p>" "<ol>" "<li>First.</li>" "<li>Second.</li>" "<li>Third.</li>" "</ol>") );

}

// We didn't expect to get here return false;

Notice that we updated our documentation for the public method as we changed the contract. We also have to return values from all of the exit points of our method. That has exposed another problem with our implementation: we never supported one motor at the stop condition, and the other at the driving or reversing condition. Well, that s fine we can return an error if we hit those conditions now. One problem with this contract is that we can t tell why our error occurred. Was it due to the state of the motors, or a problem with Rotate We could create an enum that lets us distinguish between these error types:

Figure 9-2. A tooltip with lists and formatting The following list explains the most common tags that can be used to format your tooltips: <p> ... </p>: This tag is used to enclose a paragraph. Paragraphs have some spacing above and below, separating them from other parts of the text. <br />: This tag represents a line break. If you have decided to use HTML tags, <br /> works, but \n does not. The \n system works only in texts without tags. <i> ... </i>: The enclosed text is shown as italic. <b> ... </b>: The enclosed text is shown as bold. <font color='nnn'> ... </font>: The enclosed text is shown in the specified color nnn. The color can be expressed as a color name (such as red, green, black, or white) or as a hexadecimal value prefixed with #. The format is #rrggbb, where rr is the red value, gg is the green value, and bb is the blue value.

enum TurtleError { OK, RotateError, MotorStateError }