About drag and drop – PB Docs 70

About drag and drop

Drag and drop allows users to initiate activities by dragging
a control and dropping it on another control. It provides a simple
way to make applications graphical and easy to use. For example,
in a manufacturing application you might allow the user to pick
parts from a bin for an assembly by dragging a picture of the part
and dropping it in the picture of the finished assembly.

Drag and drop involves at least two controls: the control
that is being dragged (the drag control)
and the control to which it is being dragged (the target).
In PowerBuilder, all controls except drawing objects (lines, ovals,
rectangles, and rounded rectangles) can be dragged.

Automatic drag mode

When a control is being dragged, it is in drag mode. You can
define a control so that PowerBuilder puts it automatically in drag
mode whenever a Clicked event occurs in the control, or you can
write a script to put a control into drag mode when an event occurs
in the window or the application.

Drag icons

When you define the style for a draggable object in the Window
painter, you can specify a drag icon for the control. The drag icon
displays when the control is dragged over a valid drop area (an
area in which the control can be dropped). If you do not specify
a drag icon, a rectangle the size of the control displays.

Drag events

Window objects and all controls except drawing objects have
events that occur when they are the drag target. When a dragged
control is within the target or dropped on the target, these events
can trigger scripts. The scripts determine the activity that is
performed when the drag control enters, is within, leaves, or is dropped
on the target.

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