H.map.layer.Layer
Class Summary
Extends: H.util.EventTarget
The Layer class represents an object that is evaluated by the renderer in the order in which it is added to the collection of map layers. It provides the basic infrastructure for dispatching update events to the renderer when new data is available.
[ For full details, see the Class Details ]
Method Summary
| Methods |
|---|
| This method checks if a zoom level can be served by the given layer. |
| This method sets the minimum zoom level at which the given layer provides content. |
| This method sets the maximum zoom level at which the given layer provides content. |
| This method retrieves the copyright of the current data provider. |
| This method adds a listener for a specific event. |
| This method removes a previously added listener from the |
| This method dispatches an event on the |
| This method removes listeners from the given object. Classes that extend |
| This method adds a callback which is triggered when the |
Events Summary
| Events |
|---|
| Event fired when the data associated with the given layer is updated. |
| Event fired when the minimum zoom level for the given layer changes. |
| Event fired when the maximum zoom level for the given layer changes. |
Class Description
The Layer class represents an object that is evaluated by the renderer in the order in which it is added to the collection of map layers. It provides the basic infrastructure for dispatching update events to the renderer when new data is available.
A layer is defined by a minimum and maximum zoom level for which it can provide data to the renderer and a projection it uses to transform geographic coordinates into 2D projected world coordinates.
Constructor Details
H.map.layer.Layer(opt_options)
- Parameters:
-
opt_options: -
{H.map.layer.Layer.Options=} [optional] - An optional configuration object
Method Details
isValid (zoomLevel) : {boolean}
This method checks if a zoom level can be served by the given layer.
- Parameters:
-
zoomLevel: -
{number} - The zoom level to check
- Returns:
-
{boolean} -
trueif the given layer can provide data for the zoom level, otherwisefalse
setMin (min) : {H.map.layer.Layer}
This method sets the minimum zoom level at which the given layer provides content.
- Parameters:
-
min: -
{number} - The new minimum zoom level for the given layer
- Returns:
-
{H.map.layer.Layer} - An object representing the given layer
- Throws:
-
{H.lang.InvalidArgumentError} - Throws an exception if the
minparameter is not a number or if it is larger that the current maximum zoom level
setMax (max) : {H.map.layer.Layer}
This method sets the maximum zoom level at which the given layer provides content.
- Parameters:
-
max: -
{number} - The new maximum zoom level for the given layer
- Returns:
-
{H.map.layer.Layer} - An object representing the given layer
- Throws:
-
{H.lang.InvalidArgumentError} - Throws an exception if the
maxparameter is not a number or if it is smaller that the current minimum zoom level
getCopyrights (bounds, level) : {?Array<H.map.ICopyright>}
This method retrieves the copyright of the current data provider.
Note: This function must be overridden by any class derived from Layer. The default implementation returns null.
- Parameters:
-
bounds: -
{H.geo.Rect} - The bounding area for which to retrieve the copyright information
-
level: -
{number} - The zoom level for which to retrieve the copyright information
- Returns:
-
{?Array<H.map.ICopyright>} - A list of copyright information objects for the provided area and zoom level
addEventListener (type, handler, opt_capture, opt_scope)
This method adds a listener for a specific event.
Note that to prevent potential memory leaks, you must either call removeEventListener or dispose on the given object when you no longer need it.
- Parameters:
-
type: -
{string} - The name of the event
-
handler: -
{!Function} - An event handler function
-
opt_capture: -
{boolean=} [optional] -
trueindicates that the method should listen in the capture phase (bubble otherwise) -
opt_scope: -
{Object=} [optional] - An object defining the scope for the handler function
removeEventListener (type, handler, opt_capture, opt_scope)
This method removes a previously added listener from the EventTarget instance.
- Parameters:
-
type: -
{string} - The name of the event
-
handler: -
{!Function} - A previously added event handler
-
opt_capture: -
{boolean=} [optional] -
trueindicates that the method should listen in the capture phase (bubble otherwise) -
opt_scope: -
{Object=} [optional] - An oject defining the scope for the handler function
dispatchEvent (evt)
This method dispatches an event on the EventTarget object.
- Parameters:
-
evt: -
{(H.util.Event | string)} - An object representing the event or a string with the event name
dispose ()
This method removes listeners from the given object. Classes that extend EventTarget may need to override this method in order to remove references to DOM Elements and additional listeners.
addOnDisposeCallback (callback, opt_scope)
This method adds a callback which is triggered when the EventTarget object is being disposed.
- Parameters:
-
callback: -
{!Function} - The callback function.
-
opt_scope: -
{Object=} [optional] - An optional scope for the callback function
Event Details
update: {H.util.Event}
Event fired when the data associated with the given layer is updated.
minchange: {H.util.ChangeEvent}
Event fired when the minimum zoom level for the given layer changes.
- Deprecated:
- since 3.0.7.0
maxchange: {H.util.ChangeEvent}
Event fired when the maximum zoom level for the given layer changes.
- Deprecated:
- since 3.0.7.0