Simple .NET/ASP.NET PDF document editor web control SDK

Visual Studio 2005 and ASP .NET offer some great design tools that allow you to visually construct pages. This fits in neatly with the concepts that Atlas introduces; developers can place controls on a page, and these controls generate the JavaScript that is necessary to implement the Ajax functionality. In the following sections, you ll look at how to use these controls within the integrated development environment (IDE).

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update(); emit valueChanged( m_value ); } In Listing 6-23 you can see the implementation of the paintEvent method Before you look at the code, you should know how the autoFillBackground property works As long as it is set to true (the default), the widget s background is filled with the appropriate color before the paintEvent method is entered This means that we do not have to worry about clearing the widget's area before painting to it The radius and factor helper variables are calculated in the paintEvent method Then a QPainter object is created to draw the widget First the pen is set to black, and the outer circle is drawn; then the brush is set to black, and the inner circle is drawn The pen is used to draw the contour of the circle; the brush is used to fill it.

int value = 12345678; string text = value.ToString(@"###-### \# ###"); Console.WriteLine(text);

Both will produce this output:

12-345 # 678

You can also include literal strings (with or without special characters), by wrapping them in single quotes as Example 10-30 shows.

By default, both are set to draw nothing, so setting the pen only before drawing the outer circle gives a circle contour Listing 6-23 Painting the outer and inner circles void CircleBar::paintEvent( QPaintEvent *event ) { int radius = width()/2; double factor = m_value/1000; QPainter p( this ); psetPen( Qt::black ); pdrawEllipse( 0, 0, width()-1, width()-1 ); psetBrush( Qt::black ); pdrawEllipse( (int)(radius*(10-factor)), (int)(radius*(10-factor)), (int)((width()-1)*factor)+1, (int)((width()-1)*factor)+1 ); } The final piece of the CircleBar widget is the wheelEvent method (see Listing 6-24) First the event is accepted before the value is updated using setValue The delta value of the QWheelEvent object tells how many eighths of a degree the scroll movement is Most mice scroll 15 degrees at a time, so each click in the scroll wheel corresponds to a delta of 120.

int value = 12345678; string text = value.ToString(@"###-### \# ### 'is a number'"); Console.WriteLine(text);

This produces the output:

Finally, you can also get the multiply-by-100 behavior for predivided percentage values using the % symbol, as shown in Example 10-31.

If you haven t done so already, now is a good time to take a look at Atlas projects in Visual Studio 2005. You can create a new web site by selecting File New Web Site in the Visual Studio 2005 IDE. This opens the dialog box shown in Figure 6-1. To create an Atlas-based web site, .NET Atlas Web Site template. select the ASP

I chose to divide the delta value by 20 before using it to change the value I picked the value 20 by feel the bar is resized quickly enough while still giving enough precision Listing 6-24 Updating the value from scroll wheel movements void CircleBar::wheelEvent( QWheelEvent *event ) { event->accept(); setValue( value() + event->delta()/20 ); }.

double value = 0.95; string text = value.ToString("#0.##%"); Console.WriteLine(text);

Notice that this also includes the percentage symbol in the output:

95%

Custom widgets consist of two parts: properties visible to the rest of the application (value and setValue) and event handlers (paintEvent and wheelEvent). Almost all custom widgets reimplement the paintEvent method, while the rest of the event handlers to reimplement are picked by determining which are needed to implement the functionality wanted.

There is also a per-thousand (per-mille) symbol ( ), which is Unicode character 2030. You can use this in the same way as the percentage symbol, but it multiplies up by 1,000. We ll learn more about Unicode characters later in this chapter.

It is not just numeric types that support formatting when they are converted to strings. The DateTime, DateTimeOffset, and TimeSpan types follow a similar pattern.

inside a program, because it builds in information about the time zone (and daylight saving if applicable), leaving no scope for ambiguity regarding the time it represents. However, DateTime is a more natural way to present times to users, partly because it has more scope for ambiguity. People very rarely explicitly say what time zone they re thinking of we re used to learning that a shop opens at 9:00 a.m., or that our flight

is due to arrive at 8:30 p.m. DateTime lives in this same slightly fuzzy world, where 9:00 a.m. is, in some sense, the same time before and after daylight saving comes into effect. So if you have a DateTimeOffset that you wish to display, unless you want to show the time zone information in the user interface, you will most likely convert it to a DateTime that s relative to the local time zone, as Example 10-32 shows.

This creates a solution containing references to the Atlas binaries as well as the Atlas script libraries. For more on this, see 3.