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Delphi5 developer's guide by Steve Teixeira, Xavier Pacheco

Posted On March 23, 2017 at 11:56 am by / Comments Off on Delphi5 developer's guide by Steve Teixeira, Xavier Pacheco

By Steve Teixeira, Xavier Pacheco

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When DragMode is dmAutomatic, dragging starts as soon as the mouse button goes down. • DragCursor determines the shape of the mouse pointer when it is over a draggable component. Drag-and-dock properties The following properties control drag-and-dock behavior. • • • • • DockSite DragKind DragMode FloatingDockSiteClass AutoSize For more information, see “Implementing drag-and-dock in controls” on page 6-4. Text controls Many applications present text to the user or allow the user to enter text. The type of control used for this purpose depends on the size and format of the information.

The owner of a component—the value of its Owner property—is determined by a parameter passed to the constructor when the component is created. By default, a form owns all components on it and is in turn owned by the application. Thus, when the application shuts down, the memory for all forms and the components on them is freed. Ownership applies only to TComponent and its descendants. If you create, for example, a TStringList or TCollection object (even if it is associated with a form), you are responsible for freeing the object.

For example, a button’s default event is OnClick. To create a default event handler, double-click the component in the Form Designer; this generates a skeleton event-handling procedure and opens the Code editor with the cursor in the body of the procedure, where you can easily add code. Not all components have a default event. Some components, such as the Bevel, don’t respond to any events. Other components respond differently when you double-click on them in the Form Designer. For example, many components open a default property editor or other dialog when they are double-clicked at design time.

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