.NET/ASP.NET/C#/VB.NET PDF Document SDK

The implementation of the IncreaseThread class reflects what you learned from the class declaration (you can see the code in Listing 12-14). The m_device is initialized in the constructor, and the QThread constructor is invoked to initialize the base class. In the run method, the increase method of m_device is called every 1.2 seconds, and the loop is stopped when stopThreads is set to true. Listing 12-14. The IncreaseThread class implementation IncreaseThread::IncreaseThread( TextDevice *device ) : QThread() { m_device = device; } void IncreaseThread::run() { while( !stopThreads ) { msleep( 1200 ); m_device->increase(); } } The TextDevice class is not affected from these changes and is identical to the class shown in Listing 12-8. The main function is also very similar to the previous example. The only change is that an IncreaseThread object has been added. Listing 12-15 shows the main function with the added lines highlighted. Listing 12-15. The main function, setting up a TextDevice, two TextThreads, and an IncreaseThread int main( int argc, char **argv ) { QApplication app( argc, argv ); TextDevice device; IncreaseThread inc( &device ); TextThread foo( "Foo", &device ), bar( "Bar", &device ); foo.start(); bar.start(); inc.start(); QMessageBox::information( 0, "Threading", "Close me to stop!" ); stopThreads = true; foo.wait(); bar.wait();

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is to call the get accessor, and then set the Number property on the copy returned by the array, leaving the original value unaltered. Since the copy would then immediately be discarded, the compiler has wisely determined that this is almost certainly not what we meant. (If we really want that copy-then-modify behavior, we can always write the code in Example 7-27 ourselves, making the fact that there s a copy explicit. Putting the copy into a named variable also gives us the opportunity to go on and do something with the copy, meaning that setting a property on the copy might no longer be a waste of effort.)

You might be thinking that the compiler could read and modify a copy like Example 7-27, and then write that value back using the set indexer accessor. However, as Example 7-24 showed, indexer accessors are not required to work in the obvious way, and more generally, accessors can have side effects. So the C# compiler cannot assume that such a getmodify-set sequence is necessarily safe.

Returns the behaviors associated with this control. When using Atlas Script, you can specify these behaviors using the <behaviors> child tag. Gets or sets the CSS class for this control. Gets or sets the enablement of this control. Reads the current CSS style for the control. Gets or sets the position of this control in the tab index. This is the position that it occupies when the user moves through the UI using the Tab key. Gets or sets the visibility of the control. If this is false, you will not see the control. This can be set to Hide so the control is not seen or to Collapse so the control is minimized to its top label. If the current record is the last one in the record set, then you cannot move to the next record, and this will be false; otherwise, it will be true. If the current record is the first one in the record set, then you cannot move to the previous record, and this will be false; otherwise, it will be true. This is a Sys.Data.DataTable that contains the complete set of data that is currently loaded into the ItemView control. This is returned by a select query against the underlying data source. Specifies the index of the currently selected item in the data source. Specifies the currently selected row on the data source. Specifies the number of rows in the data table within the data property. Specifies the template for the items that will be rendered within the ItemView control. It uses the <itemTemplate> child tag within Atlas Script, and each <itemTemplate> will contain a number of child controls. Specifies what to render within the ItemView control if there are no records within the data.

This problem doesn t arise with reference types, because in that case, the get accessor returns a reference rather than a value no copying occurs because that reference refers to the same object that the corresponding array entry refers to. But why does this work when we use the array directly Recall that the compiler didn t have a problem with this code:

aai.TheArray[10].Number = 123;

inc.wait(); return 0; } The application output can be seen in Listing 12-16. The order of the "Foo" and "Bar" texts can change from time to time, and the counter is updated at a slightly different interval so that sometimes you get four strings with the same counter value; sometimes you get two strings. In some circumstances, you could end up with a single "Foo" or "Bar" with one counter value (or three if IncreaseThread would happen to call increase between two write calls from the TextThread objects). Listing 12-16. The TextDevice with a separate increase method running "Call "Call "Call "Call "Call "Call "Call "Call "Call "Call "Call "Call "Call "Call "Call "Call 0: 0: 0: 0: 1: 1: 2: 2: 3: 3: 4: 4: 4: 4: 5: 5: Foo" Bar" Foo" Bar" Bar" Foo" Bar" Foo" Bar" Foo" Bar" Foo" Foo" Bar" Bar" Foo"