ASP.NET Web PDF Document Viewer/Editor Control Library

<bindings> <binding dataContext="checkBoxBoolean" dataPath="checked" property="text" transform="ToString" direction="InOut" transformerArgument="Checkbox is {0}" /> </bindings> </textBox> <checkBox targetElement="checkBoxBoolean" /> <checkBox targetElement="checkBoxDisabled"> <bindings> <binding dataContext="checkBoxBoolean" dataPath="checked" property="checked" transform="Invert" /> </bindings> </checkBox> </components> </page> </script> First, the <textBox> tag gets associated with the <input> control called textBox in the HTML markup This has a binding set up with it This binding has some new attributes set up that you haven t seen before, so let s go through the full set of attributes: dataContext: This specifies the control to which this binding will happen In this case, it is set to checkBoxBoolean, which is the checkbox on the left dataPath: The property on the dataContext control to which the binding will occur In this case, the property is checked, so you will be binding to its value property: The property on this control that is bound to the control specified in the dataContext.

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decimal dollarAmount = 123165.4539M; string text = dollarAmount.ToString("C3"); Console.WriteLine(text);

This will produce three decimal places in the output:

Figure 5-1. A list, a table, and a tree In the classic model-view-controller (MVC) design pattern (see Figure 5-2), the model keeps the data, and the view renders it to a display unit. When the user wants to edit the data, a controller class handles all modifications of the data. Qt approached this pattern in a slightly different way. Instead of having a controller class, the view handles data updating by using a delegate class (see Figure 5-2). The delegate has two

$123,165.454

Notice that it is again rounding the result. If you want to truncate, or always round up, you ll need to round the original value before you convert to a string. This formatting style is available on all of the numeric types. (We ll see some later that apply to only particular types.)

Decimal formatting is a bit confusingly named, as it actually applies to integer types, not the decimal type. It gets its name from the fact that it displays the number as a string of decimal digits (0 9), with a preceding minus sign ( ) if necessary. Example 10-9 uses this format.

int amount = 1654539; string text = amount.ToString("D9");

tasks: to help the view render each value and to help the view when the user wants to edit the value. Comparing the classic MVC pattern with Qt s approach, you can say that the controller and view have been merged, but the view uses delegates to handle parts of the controller s job.

We re asking for nine digits in the output string, and it pads with leading zeros:

In this case, it is the text property of the text box transform: The transform to apply to the data Because you are binding a text box to a checkbox, you want to transform the raw value of the checkbox from true or false to its string representation of true or false direction: The direction can be In, Out, or InOut In this case, you are using InOut, which creates a two-way binding This means that not only do changes in the control pointed to by the dataContext change this control, but changes to this control will also change the other one This is how the functionality whereby editing the checkbox will change the status of how the checkbox works transformerArgument: Using a transformer argument is a little like using a printf statement in C.

If you don t supply a qualifying number of decimal digits, as Example 10-10 shows, it just uses as many as necessary.

int amount = -2895729; string text = amount.ToString("D");