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So far you ve looked only at a script style of programming, using an existing form and controls to quickly put forms together. This style of programming is great for the rapid development of single-form applications but has some limitations when creating applications composed of multiple forms or creating libraries of forms for use with other .NET languages. In these cases, you must take a more component-oriented approach. Typically, when creating a large WinForms application, you ll want to use some forms repeatedly; furthermore, these forms typically communicate with each other by adjusting their properties and calling their methods. You usually do this by defining a new form class that derives from System.Windows.Forms. Listing 8-4 shows a simple example of this, using the class syntax introduced in 5. Listing 8-4. A Demonstration of Creating a New Type of Form #light open System open System.Windows.Forms

The parent argument is simply passed on to the QObject constructor like this: MyClass::MyClass( const string& text, QObject *parent ) : QObject( parent ) Let s look at the effects of the change, starting with Listing 1-3. It shows a main function using the MyClass class dynamically without Qt. Listing 1-3. Dynamic memory without Qt #include <iostream> int main( int argc, char **argv ) { MyClass *a, *b, *c; a = new MyClass( "foo" ); b = new MyClass( "ba-a-ar" ); c = new MyClass( "baz" ); std::cout << a->text() << " (" << a->getLengthOfText() << ")" << std::endl; a->setText( b->text() ); std::cout << a->text() << " (" << a->getLengthOfText() << ")" << std::endl; int result = a->getLengthOfText() - c->getLengthOfText(); delete a; delete b; delete c; return result; } Each new call must be followed by a call to delete to avoid a memory leak. Although it is not a big issue when exiting from the main function (because most modern operating systems free the memory when the application exits), the destructors are not called as expected. In locations other than loop-less main functions, a leak eventually leads to a system crash when the system runs out of free memory. Compare it with Listing 1-4, which uses a parent that is automatically deleted when the main function exits. The parent is responsible for calling delete for all children and ta-da! the memory is freed.

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The programmers were all pretty junior and said, It s the customer s fault because they keep asking for these features and saying the site can t launch unless we have all these complicated features. They keep coming up with new ones because they see other people s sites. I replied, You guys are engineers, and you have to explain to the customer that there s a lot of learning that happens only once the site is launched. And you have to get them to accept some kind of minimum launchable feature set. You don t need 100 user question-and-answer forums on sites that are brand new. There are only 15 users. How would they find each other if they re fragmented into 15 forums I said, You can t blame the customer. You have to work with them to come up with the minimum launchable feature set, and get the site launched. You guys need it for your r sum s; you want to be able to say that you worked on a project that succeeded and here s the site and anybody can look at it, not that you got a paycheck and accomplished nothing and that you worked for a stupid customer and it s all their fault. I brought the customer in on the same day, and we talked to them and found out that, well, they didn t need the last features if it meant that their site wasn t going to launch. They hadn t understood the tradeoffs. A couple weeks later they launched.

Greenspun: I haven t written that much. I d like to write some reusable les-

Note In the code shown in Listing 1-4, the parent object is added to show the concept. In real life, it

type MyForm() as x = class inherit Form(Width=174, Height=64) let label = new Label(Top=8, Left=8, Width=40, Text="Input:") let textbox = new TextBox(Top=8, Left=48, Width=40) let button = new Button(Top=8, Left=96, Width=60, Text="Push Me!") do button.Click.Add (fun _ -> let form = new MyForm(Text=textbox.Text) form.Show()) do x.Controls.Add(label) do x.Controls.Add(textbox) do x.Controls.Add(button) member x.Textbox = textbox end let form = let temp = new MyForm(Text="My Form") temp.Textbox.Text <- "Next!" temp [<STAThread>] do Application.Run(form) Figure 8-6 shows the resulting forms.

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