Searching and displaying child objects of a parent object

A method for searching and displaying child objects of a parent object based on a drag event, the method comprising:

• displaying, by a computer, a parent object, in response to that a user selects the parent object;
• receiving from the user, by the computer, a drag event on the parent object;
• searching, by the computer, child objects, based on a direction of a dragging movement in the drag event, wherein the child objects are associated with the parent object, wherein a search rule is predetermined for the direction of the dragging movement;
• displaying, by the computer, the child objects, wherein how many of the child objects are displayed is based on a distance of the dragging movement in the drag event;
• displaying, by the computer, one or more arrows in directions of dragging movements on the parent object;
• displaying, by the computer, search rules for respective ones of the directions of the dragging movements on the parent object;
• displaying, by the computer, the child objects in an order of satisfaction degrees of a search rule;
• receiving from the user, by the computer, a select event on at least one of the child objects;
• selecting, by the computer, the at least one of the child objects along with the parent object;
• receiving from the user, by the computer, a drop event on the parent object;
• and
• performing, by the computer, a task for the parent object and the at least one of the child objects;
• wherein in the drag event the computer receives multiple dragging movements in the direction within a predetermined time period;
• and
• wherein the computer displays a different number of the child objects and different information in each of the multiple dragging movements.