ScrollZoomHandler
Defined in: src/ui/handler/scroll_zoom.ts:36
The ScrollZoomHandler allows the user to zoom the map by scrolling.
Implements
Methods
_shouldBePrevented()
_shouldBePrevented(
e:WheelEvent):boolean
Defined in: src/ui/handler/scroll_zoom.ts:160
Determines whether or not the gesture is blocked due to cooperativeGestures.
Parameters
| Parameter | Type |
|---|---|
e |
WheelEvent |
Returns
boolean
disable()
disable():
void
Defined in: src/ui/handler/scroll_zoom.ts:152
Disables the "scroll to zoom" interaction.
Returns
void
Example
Implementation of
Handler.disable
enable()
enable(
options?:boolean|AroundCenterOptions):void
Defined in: src/ui/handler/scroll_zoom.ts:138
Enables the "scroll to zoom" interaction.
Parameters
| Parameter | Type | Description |
|---|---|---|
options? |
boolean | AroundCenterOptions |
Options object. |
Returns
void
Example
Implementation of
Handler.enable
isActive()
isActive():
boolean
Defined in: src/ui/handler/scroll_zoom.ts:120
This is used to indicate if the handler is currently active or not. In case a handler is active, it will block other handlers from getting the relevant events. There is an allow list of handlers that can be active at the same time, which is configured when adding a handler.
Returns
boolean
Implementation of
isEnabled()
isEnabled():
boolean
Defined in: src/ui/handler/scroll_zoom.ts:111
Returns a Boolean indicating whether the "scroll to zoom" interaction is enabled.
Returns
boolean
true if the "scroll to zoom" interaction is enabled.
Implementation of
Handler.isEnabled
renderFrame()
renderFrame():
object
Defined in: src/ui/handler/scroll_zoom.ts:269
renderFrame is the only non-dom event. It is called during render
frames and can be used to smooth camera changes (see scroll handler).
Returns
object
around
around:
Point
needsRenderFrame
needsRenderFrame:
boolean=!finished
noInertia
noInertia:
boolean=true
originalEvent
originalEvent:
any
zoomDelta
zoomDelta:
number
Implementation of
reset()
reset():
void
Defined in: src/ui/handler/scroll_zoom.ts:387
reset can be called by the manager at any time and must reset everything to it's original state
Returns
void
Implementation of
setWheelZoomRate()
setWheelZoomRate(
wheelZoomRate:number):void
Defined in: src/ui/handler/scroll_zoom.ts:103
Set the zoom rate of a mouse wheel
Parameters
| Parameter | Type | Description |
|---|---|---|
wheelZoomRate |
number |
1/450 The rate used to scale mouse wheel movement to a zoom value. |
Returns
void
Example
Slow down zoom of mouse wheel
setZoomRate()
setZoomRate(
zoomRate:number):void
Defined in: src/ui/handler/scroll_zoom.ts:90
Set the zoom rate of a trackpad
Parameters
| Parameter | Type | Description |
|---|---|---|
zoomRate |
number |
1/100 The rate used to scale trackpad movement to a zoom value. |
Returns
void
Example
Speed up trackpad zoom