IT. Expert System.

Enclosing class:

View

public static class View.DragShadowBuilder
extends Object

• Constructor Summary

  Constructors

  Constructor and Description
  View.DragShadowBuilder() Construct a shadow builder object with no associated View.
  View.DragShadowBuilder(View view) Constructs a shadow image builder based on a View.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  View	getView() Returns the View object that had been passed to the View.DragShadowBuilder(View) constructor.
  void	onDrawShadow(Canvas canvas) Draws the shadow image.
  void	onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) Provides the metrics for the shadow image.

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Detail

  • View.DragShadowBuilder

    public View.DragShadowBuilder(View view)

    Constructs a shadow image builder based on a View. By default, the resulting drag shadow will have the same appearance and dimensions as the View, with the touch point over the center of the View.

    Parameters:

    view - A View. Any View in scope can be used.

  • View.DragShadowBuilder

    public View.DragShadowBuilder()

    Construct a shadow builder object with no associated View. This constructor variant is only useful when the onProvideShadowMetrics(Point, Point) and onDrawShadow(Canvas) methods are also overridden in order to supply the drag shadow's dimensions and appearance without reference to any View object. If they are not overridden, then the result is an invisible drag shadow.

• Method Detail

  • getView

    public final View getView()

    Returns the View object that had been passed to the View.DragShadowBuilder(View) constructor. If that View parameter was null or if the View.DragShadowBuilder() constructor was used to instantiate the builder object, this method will return null.

    Returns:

    The View object associate with this builder object.

  • onProvideShadowMetrics

    public void onProvideShadowMetrics(Point shadowSize,
                              Point shadowTouchPoint)

    Provides the metrics for the shadow image. These include the dimensions of the shadow image, and the point within that shadow that should be centered under the touch location while dragging.

    The default implementation sets the dimensions of the shadow to be the same as the dimensions of the View itself and centers the shadow under the touch point.

    Parameters:

    shadowSize - A Point containing the width and height of the shadow image. Your application must set Point.x to the desired width and must set Point.y to the desired height of the image.

    shadowTouchPoint - A Point for the position within the shadow image that should be underneath the touch point during the drag and drop operation. Your application must set Point.x to the X coordinate and Point.y to the Y coordinate of this position.

  • onDrawShadow

    public void onDrawShadow(Canvas canvas)

    Draws the shadow image. The system creates the Canvas object based on the dimensions it received from the onProvideShadowMetrics(Point, Point) callback.

    Parameters:

    canvas - A Canvas object in which to draw the shadow image.