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## com.maryanovsky.map.client.actions.desktop
Class AreaSelectionAction

    java.lang.Object
      com.maryanovsky.map.client.actions.MapAction<HasAllDragHandlers>
          com.maryanovsky.map.client.actions.desktop.AreaSelectionAction

All Implemented Interfaces:
  EventHandler, DragCancelHandler, DragEndHandler, DragMoveHandler, DragStartHandler

    public class AreaSelectionAction

extends MapAction<HasAllDragHandlers>
implements DragStartHandler, DragMoveHandler, DragEndHandler, DragCancelHandler

A drag action which allows the user to select the area he would like to be displayed on the map.

Author:
  Maryanovsky Alexander

Field Summary

Fields inherited from class com.maryanovsky.map.client.actions.MapAction
`isAnimated, mapWidget`

Constructor Summary
`AreaSelectionAction(MapWidget mapWidget, boolean keepRatio, boolean isAnimated)` Creates a new `AreaSelectionAction` for the specified map widget, with optional ratio-keeping and animation of the transition.

Method Summary
`protected Widget` | `createSelectionWidget()` Creates the widget that will display the selected area.
`void` | `onDragCancel(DragCancelEvent evt)` Invoked when the mouse button is released without creating a drag event.
`void` | `onDragEnd(DragEndEvent evt)` Invoked when a drag gesture ends.
`void` | `onDragMove(DragMoveEvent evt)` Invoked when a drag gesture is in progress.
`void` | `onDragStart(DragStartEvent evt)` Invoked when a drag gesture starts.
`HandlerRegistration` | `registerWith(HasAllDragHandlers dragSource)` Registers for handling drag events from the specified source.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### AreaSelectionAction

    public AreaSelectionAction(MapWidget mapWidget,
                               boolean keepRatio,
                               boolean isAnimated)

  Creates a new `AreaSelectionAction` for the specified map widget, with optional ratio-keeping and animation of the transition. If `keepRatio` is `true`, the displayed selection will be forced into the same width-to-height ratio as the map widget.

  Parameters:
    `mapWidget` - The target map widget.
    `keepRatio` - Whether the width-to-height ratio of the selection rectangle should be restricted to match that of the map widget.
    `isAnimated` - Whether the zoom-in transition is animated.

Method Detail

### registerWith

    public HandlerRegistration registerWith(HasAllDragHandlers dragSource)

  Registers for handling drag events from the specified source.

  Specified by:
    `registerWith` in class `MapAction<HasAllDragHandlers>`

### createSelectionWidget

    protected Widget createSelectionWidget()

  Creates the widget that will display the selected area. The default implementation returns a `SimplePanel` with another one embedded in it. The style names are `map-AreaSelectionActionRectOuter` and `map-AreaSelectionActionRectInner`.

### onDragStart

    public void onDragStart(DragStartEvent evt)

  Invoked when a drag gesture starts.

  Specified by:
    `onDragStart` in interface `DragStartHandler`

### onDragCancel

    public void onDragCancel(DragCancelEvent evt)

  Invoked when the mouse button is released without creating a drag event.

  Specified by:
    `onDragCancel` in interface `DragCancelHandler`

### onDragMove

    public void onDragMove(DragMoveEvent evt)

  Invoked when a drag gesture is in progress.

  Specified by:
    `onDragMove` in interface `DragMoveHandler`

### onDragEnd

    public void onDragEnd(DragEndEvent evt)

  Invoked when a drag gesture ends.

  Specified by:
    `onDragEnd` in interface `DragEndHandler`

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