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DDS Reference: Display Files
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MOUBTN (Mouse Buttons) keyword for display files
Use this file- or record-level keyword to associate a Command key or EVENT-ID with one or two pointer device events.
When a specified pointer device single event is performed and no other function has a higher priority, the keyboard is locked, the cursor is moved to the pointer device cursor location, and the specified Command key or EVENT-ID is returned to the application. If the Command key or EVENT-ID normally results in entry field data validation, the data validation is performed first. If the specified Command key or EVENT-ID normally returns entry field data, inbound entry field data is included.
For pointer device double events, inbound data is not returned until the trailing edge event also occurs. When the leading edge event is detected, a programmable-two-event state is entered, a marker box is drawn around the location of the pointer device cursor (4 blue lines around the character), the pointer device cursor color is changed to white on a color nonprogrammable work stations (NWS) and the trailing edge event is looked for. Keystrokes and host data streams will cancel the programmable-two-event state. Some pointer device events are ignored while waiting for the trailing edge event. When the trailing edge event is received, the marker box is erased, the pointer device cursor color is changed to input inhibited, then keyboard is locked, the text cursor is moved to the location of the pointer device cursor, and the inbound data is returned to the host.
Note:
Although it is permitted, it may not be advisable to program some combinations of pointer device events on the same mouse button and shift state. For example, if the right button is programmed, right button double click should not be programmed because it may not be detected due to the keyboard being locked from the right button pressed event. Using the *QUEUE parameter will allow the application to handle this situation.
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