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## com.maryanovsky.map.client
Class MapWidget

    java.lang.Object
      com.google.gwt.user.client.ui.UIObject
          com.google.gwt.user.client.ui.Widget
              com.google.gwt.user.client.ui.Composite
                  com.maryanovsky.map.client.MapWidget

All Implemented Interfaces:
  HasAttachHandlers, HasHandlers, EventListener, HasVisibility, IsRenderable, IsWidget

Direct Known Subclasses:
  OverviewMapWidget

    public class MapWidget

extends Composite

A widget displaying a map and possibly other elements on it, and allows interaction with them. The style name of this widget is `"map-MapWidget"`.

Author:
  Maryanovsky Alexander

Nested Class Summary
`static class` | `MapWidget.MapAnimation` The superclass for map-related animations.

Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject
`UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled`

Field Summary
`static String` | `MAGNIFICATION_PROPERTY_NAME` The property name for magnification of the map widget.
`static String` | `MAP_PROPERTY_NAME` The property name for the map this widget is displaying.
`static String` | `SIZE_PROPERTY_NAME` The property name for the size of the map widget.
`static String` | `TEMPORARY_OFFSET_PROPERTY_NAME` The property name for the temporary offset of the map widget.

Fields inherited from class com.google.gwt.user.client.ui.UIObject
`DEBUG_ID_PREFIX`

Constructor Summary
`MapWidget(MapLocationModel mapLocationModel)` Creates a new `MapWidget` with the specified location model.

Method Summary
`void` | `addOverlay(Overlay overlay)` Adds an overlay to this `MapWidget`.
`void` | `addOverlays(Collection<? extends Overlay> overlays)` A convenience method for adding a collection of overlays.
`void` | `addPropertyChangeListener(String propertyName, PropertyChangeListener listener)` Adds the specified `PropertyChangeListener` to be notified when the property with the specified name changes.
`void` | `applyMagnification(boolean animate)` Applies the current magnification by setting the zoom and the location of the map to values closest to those seen by the user.
`void` | `applyTemporaryOffset()` Makes the temporary offset permanent and clears it.
`void` | `endCurrentAnimation()` Ends the currently running animation, if any.
`LatLngBounds` | `getBounds()` Returns the bounds of the currently displayed area, in geographical coordinates.
`LatLng` | `getCenter()` Returns the center of the displayed map.
`Pair<Double,PointView>` | `getMagnification()` Returns the current magnification.
`Map` | `getMap()` Returns the currently displayed map.
`MapLocationModel` | `getMapLocationModel()` Returns the location model of this `MapWidget`.
`SizeView` | `getMapSize()` Returns the size of the displayed map, in pixels.
`HasAllMouseHandlers` | `getMouseEventsSource()` Returns the source of mouse events for the map widget.
`AbsolutePanel` | `getOverlayPanel()` Returns the panel into which overlays should be added.
`Collection<Overlay>` | `getOverlays()` Returns all the overlays.
`int` | `getPanAnimationLength()` Returns the length of pan animations, in milliseconds.
`PointView` | `getTemporaryOffset()` Returns the temporary offset of the map, in pixels, from its "official", permanent, location.
`double` | `getTileCoverSize()` Returns the current size of the tile cover, as a percentage of the size of the widget itself.
`HasAllTouchHandlers` | `getTouchEventsSource()` Returns the source of touch events for the map widget.
`Widget` | `getUserEventWidget()` Returns the widget with which event listeners should be registered in order to receive user interaction events from the map widget.
`AbsolutePanel` | `getWidgetPanel()` Returns the panel into which widgets can be added over the map.
`int` | `getZoomAnimationLength()` Returns the length of zoom animations, in milliseconds.
`static boolean` | `isAnimatedZoomSupported()` Deprecated.
`boolean` | `isGrabCursor()` Returns whether the map widget will have the grab cursor.
`boolean` | `isLoadTilesDuringTemporaryChanges()` Returns whether tiles are loaded during temporary changes in the map's location.
`LatLng` | `localToMap(PointView point)` Converts from local (in the widget's coordinate system), pixel coordinates to map coordinates.
`Point` | `mapToLocal(LatLng location)` Converts from map coordinates to local (in the widget's coordinate system), pixel coordinates.
`void` | `moveTo(LatLng location, boolean animate)` Moves the map to center on the specified coordinate, possibly animating the transition.
`protected void` | `onLoad()` Invoked when the widget is attached to the DOM.
`protected void` | `onUnload()` Invoked when the widget is removed from the DOM.
`void` | `panBy(PointView offset, boolean animate)` Pans the map by the specified offset, in pixels, possibly animating the transition.
`void` | `panTo(PointView location, boolean animate)` Pans the map to center on the specified point, in widget coordinates, possibly animating the transition.
`void` | `removeOverlay(Overlay overlay)` Removes an overlay from this `MapWidget`.
`void` | `removeOverlays(Collection<? extends Overlay> overlays)` A convenience method for removing a collection of overlays.
`void` | `removePropertyChangeListener(String propertyName, PropertyChangeListener listener)` Removes the specified `PropertyChangeListener` from being notified when the property with the specified name changes.
`void` | `resized()` Call this method whenever you manually adjust the size of the widget after it has been displayed.
`void` | `setGrabCursor(boolean isGrabCursor)` Sets whether the map widget will use the grab cursor.
`void` | `setLoadTilesDuringTemporaryChanges(boolean isLoadTilesDuringTemporaryChanges)` Sets whether tiles are to be loaded during temporary changes in the map's location.
`void` | `setMagnification(double magnification, PointView fixedPoint)` Sets the magnification of the map while keeping the specified point (in pixels, relative to the view) fixed on the screen.
`void` | `setMap(Map map)` Sets the currently displayed map.
`void` | `setPanAnimationLength(int panAnimationLength)` Sets the length of pan animations, in milliseconds.
`void` | `setTemporaryOffset(PointView offset)` Adds a temporary offset, in pixels, to the "official", permanent, location of the map.
`void` | `setTileCoverSize(double tileCoverSize)` Sets the size of the area covered by tiles, relative to the the size of the widget itself.
`void` | `setZoomAnimationLength(int zoomAnimationLength)` Sets the length of zoom animations, in milliseconds.
`boolean` | `shouldAnimateTo(LatLng newCenter)` Returns whether panning to the specified location should use animation or not.
`void` | `show(LatLngBounds bounds, boolean animate)` Displays the specified area, centered at the center of the bounds, using the maximal zoom at which the entire area is visible.
`void` | `startAnimation(MapWidget.MapAnimation animation)` Ends the current animation, if any, and starts a new one.
`void` | `zoomBy(int zoomChange, boolean animate)` Zooms in or out by the specified number of zooms, optionally with animation (if supported).
`void` | `zoomByFixPoint(int zoomChange, PointView fixedPoint, boolean animate)` Zooms in or out by specified number of zooms, while keeping the specified pixel point (in widget coordinates) fixed on the screen, optionally with animation (if supported).
`void` | `zoomByTargetLocation(int zoomChange, LatLng targetLocation, boolean animate)` Zooms in or out by specified number of zooms, while moving the map to the specified location, optionally with animation (if supported)
`void` | `zoomByTargetPoint(int zoomChange, PointView targetPoint, boolean animate)` Zooms in or out by specified number of zooms, while moving the map to the specified pixel location (in widget coordinates), optionally with animation (if supported)
`void` | `zoomTo(int zoom, boolean animate)` Zooms to the specified zoom, optionally with animation (if supported).
`void` | `zoomToFixPoint(int zoom, PointView fixedPoint, boolean animate)` Zooms to the specified zoom, while keeping the specified pixel point (in widget coordinates) fixed on the screen, optionally with animation (if supported).
`void` | `zoomToTargetLocation(int zoom, LatLng targetLocation, boolean animate)` Zooms to the specified zoom, while moving the map to the specified location, optionally with animation (if supported).
`void` | `zoomToTargetPoint(int zoom, PointView targetPoint, boolean animate)` Zooms to the specified zoom, while moving the map to the specified pixel location (in widget coordinates), optionally with animation (if supported).

Methods inherited from class com.google.gwt.user.client.ui.Composite
`getWidget, initWidget, isAttached, onAttach, onBrowserEvent, onDetach, performDetachedInitialization, render, render, resolvePotentialElement, setWidget, wrapElement`

Methods inherited from class com.google.gwt.user.client.ui.Widget
`addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, fireEvent, getHandlerCount, getLayoutData, getParent, isOrWasAttached, removeFromParent, setLayoutData, sinkEvents`

Methods inherited from class com.google.gwt.user.client.ui.UIObject
`addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toString, unsinkEvents`

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

Field Detail

### MAP_PROPERTY_NAME

    public static final String MAP_PROPERTY_NAME

  The property name for the map this widget is displaying.

  See Also:
    Constant Field Values

### SIZE_PROPERTY_NAME

    public static final String SIZE_PROPERTY_NAME

  The property name for the size of the map widget.

  See Also:
    Constant Field Values

### TEMPORARY_OFFSET_PROPERTY_NAME

    public static final String TEMPORARY_OFFSET_PROPERTY_NAME

  The property name for the temporary offset of the map widget.

  See Also:
    Constant Field Values

### MAGNIFICATION_PROPERTY_NAME

    public static final String MAGNIFICATION_PROPERTY_NAME

  The property name for magnification of the map widget.

  See Also:
    Constant Field Values

Constructor Detail

### MapWidget

    public MapWidget(MapLocationModel mapLocationModel)

  Creates a new `MapWidget` with the specified location model.

Method Detail

### addPropertyChangeListener

    public void addPropertyChangeListener(String propertyName,
                                          PropertyChangeListener listener)

  Adds the specified `PropertyChangeListener` to be notified when the property with the specified name changes. Currently supported properties are:
  - MAP_PROPERTY_NAME
  - SIZE_PROPERTY_NAME
  - TEMPORARY_OFFSET_PROPERTY_NAME
  - MAGNIFICATION_PROPERTY_NAME

### removePropertyChangeListener

    public void removePropertyChangeListener(String propertyName,
                                             PropertyChangeListener listener)

  Removes the specified `PropertyChangeListener` from being notified when the property with the specified name changes.

### setMap

    public void setMap(Map map)

  Sets the currently displayed map.

### getMap

    public Map getMap()

  Returns the currently displayed map.

### getMapLocationModel

    public MapLocationModel getMapLocationModel()

  Returns the location model of this `MapWidget`.

### getUserEventWidget

    public Widget getUserEventWidget()

  Returns the widget with which event listeners should be registered in order to receive user interaction events from the map widget. Note that usually you should be using the event sources returned by `getMouseEventsSource()` and/or `getTouchEventsSource()` to register listeners. This method exposes the widget to allow registering for events not (yet) supported explicitly.

### getMouseEventsSource

    public HasAllMouseHandlers getMouseEventsSource()

  Returns the source of mouse events for the map widget. The coordinates of the fired mouse events are in this map widget's local coordinate system.

### getTouchEventsSource

    public HasAllTouchHandlers getTouchEventsSource()

  Returns the source of touch events for the map widget. The coordinates of the fired touch events are in this map widget's local coordinate system.

### getWidgetPanel

    public AbsolutePanel getWidgetPanel()

  Returns the panel into which widgets can be added over the map. Note that the widget panel is not guaranteed to be initially clean, and may contain widgets without which the `MapWidget` will not function properly. Basically, do not touch anything in it which you have not added yourself.

### addOverlay

    public void addOverlay(Overlay overlay)

  Adds an overlay to this `MapWidget`. Overlays, unlike widgets, are (logically) positioned relative to the map, and they normally move and change when the map moves or changes zooms.

### addOverlays

    public void addOverlays(Collection<? extends Overlay> overlays)

  A convenience method for adding a collection of overlays. See addOverlay(Overlay) for more information.

### removeOverlay

    public void removeOverlay(Overlay overlay)

  Removes an overlay from this `MapWidget`.

### removeOverlays

    public void removeOverlays(Collection<? extends Overlay> overlays)

  A convenience method for removing a collection of overlays. See removeOverlay(Overlay) for more information.

### getOverlays

    public Collection<Overlay> getOverlays()

  Returns all the overlays. The returned collection is unmodifiable.

### getOverlayPanel

    public AbsolutePanel getOverlayPanel()

  Returns the panel into which overlays should be added.

### getCenter

    public LatLng getCenter()

  Returns the center of the displayed map. Note that this may differ from the getMapLocationModel()'s center due to getTemporaryOffset().

### getMapSize

    public SizeView getMapSize()

  Returns the size of the displayed map, in pixels.

### getBounds

    public LatLngBounds getBounds()

  Returns the bounds of the currently displayed area, in geographical coordinates.

### setGrabCursor

    public void setGrabCursor(boolean isGrabCursor)

  Sets whether the map widget will use the grab cursor. Note that this may not be supported under all browsers. See `UiUtils.setGrabCursor(Widget)` and `UiUtils.setGrabbingCursor(Widget)` for more information.

### isGrabCursor

    public boolean isGrabCursor()

  Returns whether the map widget will have the grab cursor.

### setTileCoverSize

    public void setTileCoverSize(double tileCoverSize)

  Sets the size of the area covered by tiles, relative to the the size of the widget itself. For example, `setTileCoverSize(1)` would cause the tiles to cover at least the entire area of the widget (actually, slightly more, due to rounding to the tile grid). Normally, however, the tile cover should be larger than the widget, to allow the prefetching of some tiles around the visible ones.

### getTileCoverSize

    public double getTileCoverSize()

  Returns the current size of the tile cover, as a percentage of the size of the widget itself. Note that the actual cover may be slightly larger, because of rounding to the tile grid.

### setLoadTilesDuringTemporaryChanges

    public void setLoadTilesDuringTemporaryChanges(boolean isLoadTilesDuringTemporaryChanges)

  Sets whether tiles are to be loaded during temporary changes in the map's location. Setting this to `false` can speed up panning and zooming animations on slow devices.

### isLoadTilesDuringTemporaryChanges

    public boolean isLoadTilesDuringTemporaryChanges()

  Returns whether tiles are loaded during temporary changes in the map's location.

### localToMap

    public LatLng localToMap(PointView point)

  Converts from local (in the widget's coordinate system), pixel coordinates to map coordinates.

### mapToLocal

    public Point mapToLocal(LatLng location)

  Converts from map coordinates to local (in the widget's coordinate system), pixel coordinates.

### setZoomAnimationLength

    public void setZoomAnimationLength(int zoomAnimationLength)

  Sets the length of zoom animations, in milliseconds.

### getZoomAnimationLength

    public int getZoomAnimationLength()

  Returns the length of zoom animations, in milliseconds.

### setPanAnimationLength

    public void setPanAnimationLength(int panAnimationLength)

  Sets the length of pan animations, in milliseconds.

### getPanAnimationLength

    public int getPanAnimationLength()

  Returns the length of pan animations, in milliseconds.

### shouldAnimateTo

    public boolean shouldAnimateTo(LatLng newCenter)

  Returns whether panning to the specified location should use animation or not. The current implementation returns whether the current bounds and the resulting bounds intersect.

### endCurrentAnimation

    public void endCurrentAnimation()

  Ends the currently running animation, if any.

### startAnimation

    public void startAnimation(MapWidget.MapAnimation animation)

  Ends the current animation, if any, and starts a new one.

### panTo

    public void panTo(PointView location,
                      boolean animate)

  Pans the map to center on the specified point, in widget coordinates, possibly animating the transition.

### panBy

    public void panBy(PointView offset,
                      boolean animate)

  Pans the map by the specified offset, in pixels, possibly animating the transition.

### moveTo

    public void moveTo(LatLng location,
                       boolean animate)

  Moves the map to center on the specified coordinate, possibly animating the transition.

### isAnimatedZoomSupported

    @Deprecated
    public static boolean isAnimatedZoomSupported()

  Deprecated.

  Returns whether animated zoom is supported by the current environment. Since animated zoom is now supported on all browsers, this method is deprecated and always returns `true`.

### zoomByTargetLocation

    public void zoomByTargetLocation(int zoomChange,
                                     LatLng targetLocation,
                                     boolean animate)

  Zooms in or out by specified number of zooms, while moving the map to the specified location, optionally with animation (if supported)

  Parameters:
    `zoomChange` - The number of zooms to change by (use negative values to zoom out). For convenience, if the resulting zoom is illegal, the method zooms to the nearest legal zoom instead.
    `targetLocation` - The location which will be centered at the end of the zoom change.
    `animate` - If `true`, the zoom will change with a short animation.

### zoomToTargetLocation

    public void zoomToTargetLocation(int zoom,
                                     LatLng targetLocation,
                                     boolean animate)

  Zooms to the specified zoom, while moving the map to the specified location, optionally with animation (if supported).

  Parameters:
    `zoom` - The new zoom.
    `targetLocation` - The location which will be centered at the end of the zoom change.
    `animate` - If `true`, the zoom will change with a short animation.

### zoomByTargetPoint

    public void zoomByTargetPoint(int zoomChange,
                                  PointView targetPoint,
                                  boolean animate)

  Zooms in or out by specified number of zooms, while moving the map to the specified pixel location (in widget coordinates), optionally with animation (if supported)

  Parameters:
    `zoomChange` - The number of zooms to change by (use negative values to zoom out). For convenience, if the resulting zoom is illegal, the method zooms to the nearest legal zoom instead.
    `targetPoint` - The point on the widget (in widget coordinates) which will be centered at the end of the zoom change.
    `animate` - If `true`, the zoom will change with a short animation.

### zoomToTargetPoint

    public void zoomToTargetPoint(int zoom,
                                  PointView targetPoint,
                                  boolean animate)

  Zooms to the specified zoom, while moving the map to the specified pixel location (in widget coordinates), optionally with animation (if supported).

  Parameters:
    `zoom` - The new zoom.
    `targetPoint` - The point on the widget (in widget coordinates) which will be centered at the end of the zoom change.
    `animate` - If `true`, the zoom will change with a short animation.

### zoomByFixPoint

    public void zoomByFixPoint(int zoomChange,
                               PointView fixedPoint,
                               boolean animate)

  Zooms in or out by specified number of zooms, while keeping the specified pixel point (in widget coordinates) fixed on the screen, optionally with animation (if supported).

  Parameters:
    `zoomChange` - The number of zooms to change by (use negative values to zoom out). For convenience, if the resulting zoom is illegal, the method zooms to the nearest legal zoom instead.
    `fixedPoint` - The point on the widget (in widget coordinates) which will remain unmoved on the screen during and after the zoom change.
    `animate` - If `true`, the zoom will change with a short animation.

### zoomToFixPoint

    public void zoomToFixPoint(int zoom,
                               PointView fixedPoint,
                               boolean animate)

  Zooms to the specified zoom, while keeping the specified pixel point (in widget coordinates) fixed on the screen, optionally with animation (if supported).

  Parameters:
    `zoom` - The new zoom.
    `fixedPoint` - The point on the widget (in widget coordinates) which will remain unmoved on the screen during and after the zoom change.
    `animate` - If `true`, the zoom will change with a short animation.

### zoomBy

    public void zoomBy(int zoomChange,
                       boolean animate)

  Zooms in or out by the specified number of zooms, optionally with animation (if supported).

  Parameters:
    `zoomChange` - The number of zooms to change by (use negative values to zoom out). For convenience, if the resulting zoom is illegal, the method zooms to the nearest legal zoom instead.
    `animate` - If `true`, the zoom will change with a short animation.

### zoomTo

    public void zoomTo(int zoom,
                       boolean animate)

  Zooms to the specified zoom, optionally with animation (if supported).

  Parameters:
    `zoom` - The new zoom.
    `animate` - If `true`, the zoom will change with a short animation.

### show

    public void show(LatLngBounds bounds,
                     boolean animate)

  Displays the specified area, centered at the center of the bounds, using the maximal zoom at which the entire area is visible.

  Parameters:
    `bounds` - The bounds of the area to display.
    `animate` - Whether the transition from the current location should be animated.

### resized

    public void resized()

  Call this method whenever you manually adjust the size of the widget after it has been displayed. This is necessary because there is currently no way to detect such size changes. Note that this method should also be called when the border, margin or padding change, because they may affect the size of the map.

### setTemporaryOffset

    public void setTemporaryOffset(PointView offset)

  Adds a temporary offset, in pixels, to the "official", permanent, location of the map.

### getTemporaryOffset

    public PointView getTemporaryOffset()

  Returns the temporary offset of the map, in pixels, from its "official", permanent, location.

### applyTemporaryOffset

    public void applyTemporaryOffset()

  Makes the temporary offset permanent and clears it.

### setMagnification

    public void setMagnification(double magnification,
                                 PointView fixedPoint)

  Sets the magnification of the map while keeping the specified point (in pixels, relative to the view) fixed on the screen. Note that this is just a visual effect; it does not affect the current zoom or location.

### getMagnification

    public Pair<Double,PointView> getMagnification()

  Returns the current magnification.

### applyMagnification

    public void applyMagnification(boolean animate)

  Applies the current magnification by setting the zoom and the location of the map to values closest to those seen by the user.

### onLoad

    protected void onLoad()

  Invoked when the widget is attached to the DOM. Causes the tiles to be displayed.

  Overrides:
    `onLoad` in class `Widget`

### onUnload

    protected void onUnload()

  Invoked when the widget is removed from the DOM.

  Overrides:
    `onUnload` in class `Widget`

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