Yahoo! UI Library

Slider Widget  2.9.0

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Class YAHOO.widget.Slider - extends YAHOO.util.DragDrop - uses YAHOO.util.EventProvider

A DragDrop implementation that can be used as a background for a slider. It takes a reference to the thumb instance so it can delegate some of the events to it. The goal is to make the thumb jump to the location on the background when the background is clicked.

Constructor

YAHOO.widget.Slider ( id , sGroup , oThumb , sType )
Parameters:
id <String> The id of the element linked to this instance
sGroup <String> The group of related DragDrop items
oThumb <SliderThumb> The thumb for this slider
sType <String> The type of slider (horiz, vert, region)

Properties

_mouseDown - private boolean

Tracks the state of the mouse button to aid in when events are fired.
Default Value: false

_silent - private boolean

Indicates whether or not events will be supressed for the current slide operation

animate - boolean

Flag that determines if the thumb will animate when moved

animationDuration - int

If animation is configured, specifies the length of the animation in seconds.
Default Value: 0.2

backgroundEnabled - boolean

Set to false to disable a background click thumb move

baselinePos - [int, int]

The basline position of the background element, used to determine if the background has moved since the last operation.

dragOnly - boolean

Override the default setting of dragOnly to true.
Default Value: true

enableKeys - boolean

Enables the arrow, home and end keys, defaults to true.

isTarget - private object

Overrides the isTarget property in YAHOO.util.DragDrop

keyIncrement - int

Specifies the number of pixels the arrow keys will move the slider. Default is 20.

lastOffset - [int, int]

Saved offset used to protect against NaN problems when slider is set to display:none

moveComplete - Boolean

moveComplete is set to true when the slider has moved to its final destination. For animated slider, this value can be checked in the onChange handler to make it possible to execute logic only when the move is complete rather than at all points along the way. Deprecated because this flag is only useful when the background is clicked and the slider is animated. If the user drags the thumb, the flag is updated when the drag is over ... the final onDrag event fires before the mouseup the ends the drag, so the implementer will never see it.
Deprecated: use the slideEnd event instead

Slider.ANIM_AVAIL - static boolean

By default, animation is available if the animation utility is detected.

Slider.SOURCE_KEY_EVENT - static final object

Constant for valueChangeSource, indicating that the value was altered by hitting any of the supported keyboard characters.
Default Value: 2

Slider.SOURCE_SET_VALUE - static final object

Constant for valueChangeSource, indicating that the value was altered by a programmatic call to setValue/setRegionValue.
Default Value: 2

Slider.SOURCE_UI_EVENT - static final object

Constant for valueChangeSource, indicating that the user clicked or dragged the slider to change the value.
Default Value: 1

SOURCE_SET_VALUE - final object

Constant for valueChangeSource, indicating that the value was altered by a programmatic call to setValue/setRegionValue.
Default Value: 2
Deprecated: use static Slider.SOURCE_SET_VALUE

SOURCE_UI_EVENT - final object

Constant for valueChangeSource, indicating that the user clicked or dragged the slider to change the value.
Default Value: 1
Deprecated: use static Slider.SOURCE_UI_EVENT

thumb - YAHOO.widget.SliderThumb

A YAHOO.widget.SliderThumb instance that we will use to reposition the thumb when the background is clicked

thumbCenterPoint - {"x": int, "y": int}

The center of the slider element is stored so we can place it in the correct position when the background is clicked.

tickPause - int

Adjustment factor for tick animation, the more ticks, the faster the animation (by default)

type - string

The type of the slider (horiz, vert, region)

valueChangeSource - int

When the slider value changes, this property is set to identify where the update came from. This will be either 1, meaning the slider was clicked or dragged, or 2, meaning that it was set via a setValue() call. This can be used within event handlers to apply some of the logic only when dealing with one source or another.

Methods

_bindKeyEvents

protected void _bindKeyEvents ( )
Sets up the listeners for keydown and key press events.

_getNextX

private void _getNextX ( )
Returns the next X tick value based on the current coord and the target coord.

_getNextY

private void _getNextY ( )
Returns the next Y tick value based on the current coord and the target coord.

_setRegionValue

protected boolean _setRegionValue ( source , newOffset , newOffset2 , skipAnim , force , silent )
Worker function to execute the value set operation. Accepts type of set operation in addition to the usual setValue params.
Parameters:
source <int> what triggered the set (e.g. Slider.SOURCE_SET_VALUE)
newOffset <int> the number of pixels the thumb should be positioned away from the initial start point (x axis for region)
newOffset2 <int> the number of pixels the thumb should be positioned away from the initial start point (y axis for region)
skipAnim <boolean> set to true to disable the animation for this move action (but not others).
force <boolean> ignore the locked setting and set value anyway
silent <boolean> when true, do not fire events
Returns: boolean
true if the move was performed, false if it failed

_setValue

protected boolean _setValue ( source , newOffset , skipAnim , force , silent )
Worker function to execute the value set operation. Accepts type of set operation in addition to the usual setValue params.
Parameters:
source <int> what triggered the set (e.g. Slider.SOURCE_SET_VALUE)
newOffset <int> the number of pixels the thumb should be positioned away from the initial start point
skipAnim <boolean> set to true to disable the animation for this move action (but not others).
force <boolean> ignore the locked setting and set value anyway
silent <boolean> when true, do not fire events
Returns: boolean
true if the move was performed, false if it failed

b4MouseDown

private void b4MouseDown ( )
Resets the constraints before moving the thumb.

endMove

private void endMove ( )
Fired when the slider movement ends

fireEvents

private void fireEvents ( thumbEvent )
Fires the change event if the value has been changed. Ignored if we are in the middle of an animation as the event will fire when the animation is complete
Parameters:
thumbEvent <boolean> set to true if this event is fired from an event that occurred on the thumb. If it is, the state of the thumb dd object should be correct. Otherwise, the event originated on the background, so the thumb state needs to be refreshed before proceeding.

focus

private void focus ( )
Try to focus the element when clicked so we can add accessibility features

getThumb

SliderThumb getThumb ( )
Returns a reference to this slider's thumb
Returns: SliderThumb
this slider's thumb

getValue

int getValue ( )
Returns the slider's thumb offset from the start position
Returns: int
the current value

getXValue

int getXValue ( )
Returns the slider's thumb X offset from the start position
Returns: int
the current horizontal offset

getYValue

int getYValue ( )
Returns the slider's thumb Y offset from the start position
Returns: int
the current vertical offset

handleKeyDown

void handleKeyDown ( e )
Executed when a keydown event happens with the control focused. Updates the slider value and display when the keypress is an arrow key, home, or end as long as enableKeys is set to true.
Parameters:
e <Event> the keydown event

handleKeyPress

void handleKeyPress ( e )
Executed when a keypress event happens with the control focused. Prevents the default behavior for navigation keys. The actual logic for moving the slider thumb in response to a key event happens in handleKeyDown.
Parameters:
e <Event> the keypress event

initSlider

void initSlider ( sType )
Initializes the slider. Executed in the constructor
Parameters:
sType <string> the type of slider (horiz, vert, region)

initThumb

void initThumb ( t )
Initializes the slider's thumb. Executed in the constructor.
Parameters:
t <YAHOO.widget.SliderThumb> the slider thumb

lock

void lock ( )
Locks the slider, overrides YAHOO.util.DragDrop

moveOneTick

private void moveOneTick ( the )
Move the slider one tick mark towards its final coordinate. Used for the animation when tick marks are defined
Parameters:
the <int[]> destination coordinate

moveThumb

private void moveThumb ( x , y , skipAnim , midMove )
Move the associated slider moved to a timeout to try to get around the mousedown stealing moz does when I move the slider element between the cursor and the background during the mouseup event
Parameters:
x <int> the X coordinate of the click
y <int> the Y coordinate of the click
skipAnim <boolean> don't animate if the move happend onDrag
midMove <boolean> set to true if this is not terminating the slider movement

onAvailable

void onAvailable ( )
Executed when the slider element is available

onChange

void onChange ( firstOffset , secondOffset )
Event that fires when the value of the slider has changed
Parameters:
firstOffset <int> the number of pixels the thumb has moved from its start position. Normal horizontal and vertical sliders will only have the firstOffset. Regions will have both, the first is the horizontal offset, the second the vertical.
secondOffset <int> the y offset for region sliders
Deprecated use instance.subscribe("change") instead

onDrag

private void onDrag ( )
Handles the onDrag event for the slider background

onMouseDown

private void onMouseDown ( )
Handles the mousedown event for the slider background

onSliderEnd

void onSliderEnd ( )
Event that fires at the end of a slider thumb move
Deprecated use instance.subscribe("slideEnd") instead

onSlideStart

void onSlideStart ( )
Event that fires when the at the beginning of the slider thumb move
Deprecated use instance.subscribe("slideStart") instead

resetThumbConstraints

protected void resetThumbConstraints ( )
Resets the X and Y contraints for the thumb. Used in lieu of the thumb instance's inherited resetConstraints because some logic was not applicable.

setRegionValue

boolean setRegionValue ( newOffset , newOffset2 , skipAnim , force , silent )
Provides a way to set the value of the region slider in code.
Parameters:
newOffset <int> the number of pixels the thumb should be positioned away from the initial start point (x axis for region)
newOffset2 <int> the number of pixels the thumb should be positioned away from the initial start point (y axis for region)
skipAnim <boolean> set to true to disable the animation for this move action (but not others).
force <boolean> ignore the locked setting and set value anyway
silent <boolean> when true, do not fire events
Returns: boolean
true if the move was performed, false if it failed

setStartSliderState

void setStartSliderState ( )
Initialization that sets up the value offsets once the elements are ready

setThumbCenterPoint

void setThumbCenterPoint ( )
When the thumb is available, we cache the centerpoint of the element so we can position the element correctly when the background is clicked

setValue

boolean setValue ( newOffset , skipAnim , force , silent )
Provides a way to set the value of the slider in code.
Parameters:
newOffset <int> the number of pixels the thumb should be positioned away from the initial start point
skipAnim <boolean> set to true to disable the animation for this move action (but not others).
force <boolean> ignore the locked setting and set value anyway
silent <boolean> when true, do not fire events
Returns: boolean
true if the move was performed, false if it failed

thumbMouseUp

private void thumbMouseUp ( )
Handles mouseup event on the thumb

toString

string toString ( )
Slider toString
Returns: string
string representation of the instance

unlock

void unlock ( )
Unlocks the slider, overrides YAHOO.util.DragDrop

verifyOffset

boolean verifyOffset ( )
Checks the background position element position. If it has moved from the baseline position, the constraints for the thumb are reset
Returns: boolean
True if the offset is the same as the baseline.

YAHOO.widget.Slider.getHorizDualSlider

static DualSlider YAHOO.widget.Slider.getHorizDualSlider ( bg , minthumb , maxthumb , range , iTickSize , initVals )
Factory method for creating a horizontal dual-thumb slider
Parameters:
bg <String> the id of the slider's background element
minthumb <String> the id of the min thumb
maxthumb <String> the id of the thumb thumb
range <int> the number of pixels the thumbs can move within
iTickSize <int> (optional) the element should move this many pixels at a time
initVals <Array> (optional) [min,max] Initial thumb placement
Returns: DualSlider
a horizontal dual-thumb slider control

YAHOO.widget.Slider.getHorizSlider

static Slider YAHOO.widget.Slider.getHorizSlider ( sBGElId , sHandleElId , iLeft , iRight , iTickSize )
Factory method for creating a horizontal slider
Parameters:
sBGElId <String> the id of the slider's background element
sHandleElId <String> the id of the thumb element
iLeft <int> the number of pixels the element can move left
iRight <int> the number of pixels the element can move right
iTickSize <int> optional parameter for specifying that the element should move a certain number pixels at a time.
Returns: Slider
a horizontal slider control

YAHOO.widget.Slider.getSliderRegion

static Slider YAHOO.widget.Slider.getSliderRegion ( sBGElId , sHandleElId , iLeft , iRight , iUp , iDown , iTickSize )
Factory method for creating a slider region like the one in the color picker example
Parameters:
sBGElId <String> the id of the slider's background element
sHandleElId <String> the id of the thumb element
iLeft <int> the number of pixels the element can move left
iRight <int> the number of pixels the element can move right
iUp <int> the number of pixels the element can move up
iDown <int> the number of pixels the element can move down
iTickSize <int> optional parameter for specifying that the element should move a certain number pixels at a time.
Returns: Slider
a slider region control

YAHOO.widget.Slider.getVertDualSlider

static DualSlider YAHOO.widget.Slider.getVertDualSlider ( bg , minthumb , maxthumb , range , iTickSize , initVals )
Factory method for creating a vertical dual-thumb slider.
Parameters:
bg <String> the id of the slider's background element
minthumb <String> the id of the min thumb
maxthumb <String> the id of the thumb thumb
range <int> the number of pixels the thumbs can move within
iTickSize <int> (optional) the element should move this many pixels at a time
initVals <Array> (optional) [min,max] Initial thumb placement
Returns: DualSlider
a vertical dual-thumb slider control

YAHOO.widget.Slider.getVertSlider

static Slider YAHOO.widget.Slider.getVertSlider ( sBGElId , sHandleElId , iUp , iDown , iTickSize )
Factory method for creating a vertical slider
Parameters:
sBGElId <String> the id of the slider's background element
sHandleElId <String> the id of the thumb element
iUp <int> the number of pixels the element can move up
iDown <int> the number of pixels the element can move down
iTickSize <int> optional parameter for specifying that the element should move a certain number pixels at a time.
Returns: Slider
a vertical slider control

Methods inherited from YAHOO.util.DragDrop:

addInvalidHandleClass, addInvalidHandleId, addInvalidHandleType, addToGroup, applyConfig, b4Drag, b4DragDrop, b4DragOut, b4DragOver, b4EndDrag, b4MouseDown, b4StartDrag, clearConstraints, clearTicks, clickValidator, endDrag, getDragEl, getEl, getTargetCoord, getTick, handleMouseDown, handleOnAvailable, init, initTarget, isLocked, isValidHandleChild, lock, on, onAvailable, onDrag, onDragDrop, onDragEnter, onDragOut, onDragOver, onInvalidDrop, onMouseDown, onMouseUp, removeFromGroup, removeInvalidHandleClass, removeInvalidHandleId, removeInvalidHandleType, resetConstraints, setDragElId, setHandleElId, setInitialPosition, setOuterHandleElId, setPadding, setStartPosition, setXConstraint, setXTicks, setYConstraint, setYTicks, startDrag, toString, unlock, unreg

Methods inherited from YAHOO.util.EventProvider:

createEvent, fireEvent, hasEvent, subscribe, unsubscribe, unsubscribeAll

Events

change

change ( newOffset|x , y )
Event the fires when the value of the control changes. If the control is animated the event will fire every point along the way.
Parameters:
newOffset|x <int> the new offset for normal sliders, or the new x offset for region sliders
y <int> the number of pixels the thumb has moved on the y axis (region sliders only)

slideEnd

slideEnd ( )
Event that fires at the end of a slider thumb move

slideStart

slideStart ( )
Event that fires at the beginning of a slider thumb move.
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