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people could search and send email to. Instead of building our own directory, we partnered with Rocketmail. We said, OK, we ll use your directory on our website and we ll send you our registration data so you could register these people s email accounts. We didn t want to build a directory just for people to search for email. All they had was a directory, that s what they specialized in, that was their business. They found out how many registrations we were sending them daily they saw our growth from hundreds to thousands to tens of thousands, and that s when they said, Even we ourselves cannot get these kinds of registrations on our website. We should do email. So they decided to do email and that s how they came up with Rocketmail.

is used to remove an item from one list widget without having to delete it. This method tells the list widget that you take responsibility for managing the item and removes it from the list widget. You can then add the item to the other list widget using the addItem(QListWidgetItem*) method. This approach enables you to move the items between the list widgets without deleting or creating anything. Listing 3-10. Slot for moving items from the right to the left void ListWidgetDialog::moveLeft() { if( rightList->selectedItems().count() != 1 ) return; QListWidgetItem *item = rightList->takeItem( rightList->currentRow() ); leftList->addItem( item ); }

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The IEvent module, first discussed in 7, can be useful when working with events in WinForms. When working with events in a WinForm, there is often not an event that exactly fits what you want. For example, the MouseButton event is raised when either the left or right mouse button is clicked, but you might want to respond only to the click of the left mouse button. In

Livingston: Were you pissed Bhatia: They are also funded by Draper Fisher Jurvetson. So Draper was see-

A combo box can be used like a list widget when only the current item is shown. An alternate use is to provide the users with a list of items, but also enable them to write their own texts. You control whether the user can type in custom text by using the editable property. When the user picks an item from the list, the activated(int) and activated(const QString&) signals are emitted.

ing two of its own companies create two different email systems. We felt bad that they had done it, but we couldn t go to Draper and say anything. It was a decision that the company took, that s what DFJ told us, and we were pissed at them, but at that time we knew we had to not share too much information with DFJ as well.

Livingston: So you didn t have a showdown with Rocketmail Bhatia: We just scrapped our partnership and decided, OK, competition is

this case, it can be useful to use the IEvent.filter function to create a new event that responds only to the left mouse button click. The next example demonstrates how to do this: light open System.Windows.Forms let form = let temp = new Form() temp.MouseClick |> IEvent.filter (fun e -> e.Button = MouseButtons.Left) |> IEvent.listen (fun _ -> MessageBox.Show("Left button") |> ignore) temp Application.Run(form) Here the filter function is used with a function that checks whether the left mouse button is pressed; the resulting event is then piped forward to the listen function that adds an event handler to the event, exactly as if you had called the event s .Add method. You could have implemented this using an if expression within the event handler, but this technique has the advantage of separating the logic that controls the event firing and what happens during the event itself. If you want, several event handlers can reuse the new event. Listing 8-3 demonstrates using more of IEvent s functions to create a simple drawing application (shown in Figure 8-5). Here you want to use the MouseDown event in different ways, first to monitor whether the mouse is pressed at all and then to split the event into left or right button presses using the IEvent.partition function. This is used to control the drawing color, either red or black. Listing 8-3. Using Events to Implement a Simple Drawing Application #light open System open System.Drawing open System.Windows.Forms let form = let temp = new Form(Text = "Scribble !!") let let let let pointsMasterList = ref [] pointsTempList = ref [] mouseDown = ref false pen = ref (new Pen(Color.Black))

When you need to iterate in a specialized way or just want to access a specific item, you can always use indexed access with the [] operator or the at method. For a QList, this process is very quick. For example, the following line calculates the sum of the sixth and eighth element of a list: int sum = list[5] + list.at(7);

Livingston: Then you started to get into talks with Microsoft Bhatia: Talks with Microsoft started after our first anniversary, which was July

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