About drag-and-drop in forms

For situations where drag-and-drop capability is desired, you can set up two or more components to perform these operations. For example, you might want to allow users to delete records by dragging a row from a grid collection to a trash can icon.

WinStudio uses a combination of “Drag From Events” and “Drop On Events” to perform drag-and-drop operations. During run time, this is how the system works:

  • A user clicks and holds down the mouse button, with the cursor hovering over a component that has at least one “Drag From Event” configured.
  • WinStudio recognizes that there is at least one “Drag From Event” configured and draws a "drag image" to visually cue the user that the object has been "captured."

This drag image, by default, is a semitransparent rendering of the component from which the object was selected. You can use the “Drag Image” property to replace the default with a graphic image.

  • The user drags the object to a component that has a matching “Drop On Event” configured and releases the mouse button.
  • WinStudio recognizes that there is a corresponding “Drop On Event” configured. WinStudio then generates the first event that matches a “Drag From Event” with a “Drop On Event”.
注意：
  • If the object being dragged is a record from a grid collection, the default "sprite" is the visible portion of the column in which the record was captured. If this is not the desired effect, you can use the “Drag Image” property to assign a graphic file to use as the "sprite" image.
  • You can drag and drop any component except the Form Page, the Toolbar Button, or the Menu Item.
  • To enable drag-and-drop from graph components, you must lock the graph object.
  • If you enable drag-and-drop for an Edit component, users are unable to select text in that field.
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