Class Stepper

java.lang.Object

com.codename1.ui.Component

com.codename1.ui.Container

com.codename1.components.Stepper

All Implemented Interfaces:

Animation, Editable, StyleListener, Iterable<Component>

public class Stepper
extends Container

A numeric field with increment and decrement controls: NSStepper, WinUI's NumberBox with its spin buttons, GtkSpinButton.

Codename One had no equivalent. The nearest thing is Slider, which is a different control for a different job -- a slider is for a value whose exact number does not matter, and a stepper is for one where it does. An application that needed a bounded number on the desktop had to build the composite by hand, and every hand-built one got the same two things wrong: it let the field hold text that is not a number, and it let the buttons walk past the bounds.

Stepper copies = new Stepper(1, 1, 99);
copies.addActionListener(e -> print(copies.getValue()));

Three UIIDs: Stepper for the composite, StepperField for the text field and StepperButton for the two buttons. The buttons carry - and + by default; a theme or an application that wants arrows sets icons on #getDecrementButton() and #getIncrementButton().

The value is an int. A stepper over a fractional quantity is a real control on some platforms, and it is deliberately not this one: doing it properly means a format, a locale and a parse policy, and guessing those is worse than not offering them.

Field Summary

Fields inherited from class Component

BASELINE, BOTTOM, BRB_CENTER_OFFSET, BRB_CONSTANT_ASCENT, BRB_CONSTANT_DESCENT, BRB_OTHER, CENTER, CROSSHAIR_CURSOR, DEFAULT_CURSOR, DRAG_REGION_IMMEDIATELY_DRAG_X, DRAG_REGION_IMMEDIATELY_DRAG_XY, DRAG_REGION_IMMEDIATELY_DRAG_Y, DRAG_REGION_LIKELY_DRAG_X, DRAG_REGION_LIKELY_DRAG_XY, DRAG_REGION_LIKELY_DRAG_Y, DRAG_REGION_NOT_DRAGGABLE, DRAG_REGION_POSSIBLE_DRAG_X, DRAG_REGION_POSSIBLE_DRAG_XY, DRAG_REGION_POSSIBLE_DRAG_Y, E_RESIZE_CURSOR, HAND_CURSOR, LEFT, MOVE_CURSOR, N_RESIZE_CURSOR, NE_RESIZE_CURSOR, NW_RESIZE_CURSOR, RIGHT, S_RESIZE_CURSOR, SE_RESIZE_CURSOR, SW_RESIZE_CURSOR, TEXT_CURSOR, TOP, W_RESIZE_CURSOR, WAIT_CURSOR

Constructor Summary

Constructors

Constructor	Description
Stepper()	A stepper over 0..100 starting at 0.
Stepper(int value, int minValue, int maxValue)	A stepper over the given range.

Method Summary

Modifier and Type	Method	Description
void	addActionListener(ActionListener l)	Notified when the value changes, however it changed.
Button	getDecrementButton()	The decrement button, for a caller that wants to give it an icon.
TextField	getField()	The editable field, for a caller that wants to make it read-only.
Button	getIncrementButton()	The increment button, for a caller that wants to give it an icon.
int	getMaxValue()	The highest value this control will produce.
int	getMinValue()	The lowest value this control will produce.
int	getStep()	How far one press of a button moves the value.
int	getValue()	The current value.
void	removeActionListener(ActionListener l)	Stops notifying a listener.
void	setRange(int minValue, int maxValue)	Sets the range.
void	setStep(int step)	Sets how far one press of a button moves the value.
void	setValue(int newValue)	Sets the value, clamped into the range.

Methods inherited from class Container

add, add, add, add, add, add, addAll, addComponent, addComponent, addComponent, addComponent, animateHierarchy, animateHierarchyAndWait, animateHierarchyFade, animateHierarchyFadeAndWait, animateLayout, animateLayoutAndWait, animateLayoutFade, animateLayoutFadeAndWait, animateUnlayout, animateUnlayoutAndWait, applyRTL, calcPreferredSize, cancelRepaints, clearClientProperties, constrainHeightWhenScrollable, constrainWidthWhenScrollable, contains, createAnimateHierarchy, createAnimateHierarchyFade, createAnimateLayout, createAnimateLayoutFade, createAnimateLayoutFadeAndWait, createAnimateMotion, createAnimateUnlayout, createReplaceTransition, dragInitiated, drop, encloseIn, encloseIn, findDropTargetAt, findFirstFocusable, fireClicked, flushReplace, forceRevalidate, getBottomGap, getChildrenAsList, getClosestComponentTo, getComponentAt, getComponentAt, getComponentCount, getComponentIndex, getGridPosX, getGridPosY, getLayout, getLayoutHeight, getLayoutWidth, getLeadComponent, getLeadParent, getResponderAt, getSafeAreaRoot, getScrollIncrement, getSideGap, getUIManager, initLaf, invalidate, isEnabled, isSafeArea, isSafeAreaRoot, isScrollableX, isScrollableY, isSelectableInteraction, isSurface, iterator, iterator, keyPressed, keyReleased, layoutContainer, morph, morphAndWait, paint, paintComponentBackground, paintGlass, paramString, pointerPressed, refreshTheme, removeAll, removeComponent, replace, replace, replaceAndWait, replaceAndWait, replaceAndWait, revalidate, revalidateLater, revalidateWithAnimationSafety, scrollComponentToVisible, setCellRenderer, setEnabled, setLayout, setLeadComponent, setSafeArea, setSafeAreaRoot, setScrollable, setScrollableX, setScrollableY, setScrollIncrement, setShouldCalcPreferredSize, setShouldLayout, setUIManager, updateTabIndices

Methods inherited from class Component

accessibilityChanged, accessibilityChanged, addContextMenuListener, addDragFinishedListener, addDragOverListener, addDropListener, addFocusListener, addLongPressListener, addMouseWheelListener, addNativeDragOverListener, addNativeDropListener, addPointerDraggedListener, addPointerPressedListener, addPointerReleasedListener, addPullToRefresh, addScrollListener, addStateChangeListener, addStylusListener, animate, announceForAccessibility, bindProperty, blocksSideSwipe, calcScrollSize, canAcceptNativeDrop, consumesRawTextInput, contains, containsOrOwns, createNativeDragOperation, createStyleAnimation, deinitialize, deinitializeCustomStyle, deregisterFromAnimation, dragEnter, dragExit, dragFinished, draggingOver, drawDraggedImage, focusGained, focusLost, getAbsoluteX, getAbsoluteY, getAcceptedDropActions, getAcceptedDropMimeTypes, getAccessibilityNode, getAccessibilityText, getAllStyles, getAnimationManager, getBaseline, getBaselineResizeBehavior, getBindablePropertyNames, getBindablePropertyTypes, getBorder, getBoundPropertyValue, getBounds, getBounds, getClientProperty, getCloudBoundProperty, getCloudDestinationProperty, getComponentForm, getComponentState, getContextMenuCommands, getCursor, getDefaultDragTransparency, getDirtyRegion, getDisabledStyle, getDraggedx, getDraggedy, getDragImage, getDragRegionStatus, getDragSpeed, getDragTransparency, getEditingDelegate, getHeight, getHoverStyle, getInlineAllStyles, getInlineDisabledStyles, getInlinePressedStyles, getInlineSelectedStyles, getInlineStylesTheme, getInlineUnselectedStyles, getInnerHeight, getInnerPreferredH, getInnerPreferredW, getInnerWidth, getInnerX, getInnerY, getLabelForComponent, getName, getNativeDragOperation, getNativeOverlay, getNextFocusDown, getNextFocusLeft, getNextFocusRight, getNextFocusUp, getOuterHeight, getOuterPreferredH, getOuterPreferredW, getOuterWidth, getOuterX, getOuterY, getOwner, getParent, getPreferredH, getPreferredSize, getPreferredSizeStr, getPreferredTabIndex, getPreferredW, getPressedStyle, getPropertyNames, getPropertyTypeNames, getPropertyTypes, getPropertyValue, getSameHeight, getSameWidth, getScrollable, getScrollAnimationSpeed, getScrollDimension, getScrollOpacity, getScrollOpacityChangeSpeed, getScrollX, getScrollY, getSelectCommandText, getSelectedRect, getSelectedStyle, getSemantics, getStyle, getTabIndex, getTensileLength, getTextSelectionSupport, getTooltip, getTopLevelContainer, getUIID, getUnselectedStyle, getVisibleBounds, getVisibleBounds, getWidth, getX, getY, growShrink, handlesInput, hasFixedPreferredSize, hasFocus, hideNativeOverlay, initComponent, initCustomStyle, initDisabledStyle, initPressedStyle, initSelectedStyle, initUnselectedStyle, installDefaultPainter, isAlwaysTensile, isBlockLead, isCellRenderer, isChildOf, isDragActivated, isDragAndDropOperation, isDraggable, isDragRegion, isDropTarget, isEditable, isEditing, isFlatten, isFocusable, isGrabsPointerEvents, isHidden, isHidden, isHideInLandscape, isHideInPortrait, isHovered, isHScrollThumbGrabbed, isHScrollThumbHover, isIgnorePointerEvents, isInClippingRegion, isInitialized, isNativeDragSource, isNativeDropTarget, isOpaque, isOwnedBy, isPinchBlocksDragAndDrop, isRippleEffect, isRTL, isScrollable, isScrollVisible, isSetCursorSupported, isSmoothScrolling, isSnapToGrid, isStickyDrag, isTactileTouch, isTactileTouch, isTensileDragEnabled, isTraversable, isVisible, isVScrollThumbGrabbed, isVScrollThumbHover, keyRepeated, laidOut, longKeyPress, longPointerPress, mouseWheel, nativeDragEnter, nativeDragExit, nativeDragOver, nativeDrop, onScrollX, onScrollY, onSetFocusable, paintBackground, paintBackgrounds, paintBorder, paintBorderBackground, paintComponent, paintComponent, paintIntersectingComponentsAbove, paintLock, paintLockRelease, paintRippleOverlay, paintScrollbars, paintScrollbarX, paintScrollbarY, paintShadows, parsePreferredSize, pinch, pinch, pinchReleased, pointerDragged, pointerDragged, pointerHover, pointerHoverPressed, pointerHoverReleased, pointerPressed, pointerReleased, pointerReleased, putClientProperty, refreshTheme, refreshTheme, registerForAnimation, remove, removeContextMenuListener, removeDragFinishedListener, removeDragOverListener, removeDropListener, removeFocusListener, removeLongPressListener, removeMouseWheelListener, removeNativeDragOverListener, removeNativeDropListener, removePointerDraggedListener, removePointerPressedListener, removePointerReleasedListener, removeScrollListener, removeStateChangeListener, removeStylusListener, repaint, repaint, requestFocus, resetFocusable, respondsToPointerEvents, rotation, scrollRectToVisible, scrollRectToVisible, setAcceptedDropActions, setAcceptedDropMimeTypes, setAccessibilityText, setAlwaysTensile, setBlockLead, setBoundPropertyValue, setCloudBoundProperty, setCloudDestinationProperty, setComponentState, setContextMenuCommands, setCursor, setDefaultDragTransparency, setDirtyRegion, setDisabledStyle, setDraggable, setDragTransparency, setDropTarget, setEditingDelegate, setFlatten, setFocus, setFocusable, setGrabsPointerEvents, setHandlesInput, setHeight, setHidden, setHidden, setHideInLandscape, setHideInPortrait, setHorizontalScrollBounds, setHovered, setHoverStyle, setIgnorePointerEvents, setInitialized, setInlineAllStyles, setInlineDisabledStyles, setInlinePressedStyles, setInlineSelectedStyles, setInlineStylesTheme, setInlineUnselectedStyles, setIsScrollVisible, setLabelForComponent, setName, setNativeDragOperation, setNativeDragSource, setNativeDropTarget, setNextFocusDown, setNextFocusLeft, setNextFocusRight, setNextFocusUp, setOpaque, setOwner, setPinchBlocksDragAndDrop, setPreferredH, setPreferredSize, setPreferredSizeStr, setPreferredTabIndex, setPreferredW, setPressedStyle, setPropertyValue, setPullToRefresh, setRippleEffect, setRTL, setSameHeight, setSameSize, setSameWidth, setScrollAnimationSpeed, setScrollOpacityChangeSpeed, setScrollSize, setScrollVisible, setScrollX, setScrollY, setSelectCommandText, setSelectedStyle, setSize, setSmoothScrolling, setSnapToGrid, setTabIndex, setTactileTouch, setTensileDragEnabled, setTensileLength, setTooltip, setTraversable, setUIID, setUIID, setUIIDFinal, setUnselectedStyle, setVerticalScrollBounds, setVisible, setWidth, setX, setY, shouldBlockSideSwipe, shouldBlockSideSwipeLeft, shouldBlockSideSwipeRight, shouldRenderComponentSelection, showNativeOverlay, startEditingAsync, stopEditing, stopScrollMomentum, stripMarginAndPadding, styleChanged, toImage, toString, unbindProperty, updateNativeOverlay, visibleBoundsContains

Methods inherited from class Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface Iterable

forEach

Constructor Details

Stepper

public Stepper()

A stepper over 0..100 starting at 0.

Stepper

public Stepper(int value,
 int minValue,
 int maxValue)

A stepper over the given range.

Parameters

• value: the initial value, clamped into the range

• minValue: the lowest value the control will produce

• maxValue: the highest value the control will produce

Method Details

getValue

public int getValue()

The current value.

Returns

the value, always within #getMinValue()..#getMaxValue()

setValue

public void setValue(int newValue)

Sets the value, clamped into the range. Fires the action listeners only when the value actually moved, so a caller that sets the same value twice does not report a change that did not happen.

Parameters

• newValue: the requested value

getMinValue

public int getMinValue()

The lowest value this control will produce.

Returns

the minimum

getMaxValue

public int getMaxValue()

The highest value this control will produce.

Returns

the maximum

setRange

public void setRange(int minValue,
 int maxValue)

Sets the range. The current value is clamped into the new range, which fires the listeners when that moves it.

Parameters

• minValue: the lowest value

• maxValue: the highest value

getStep

public int getStep()

How far one press of a button moves the value.

Returns

the step, at least 1

setStep

public void setStep(int step)

Sets how far one press of a button moves the value.

Parameters

• step: the step, which must be positive

getDecrementButton

public Button getDecrementButton()

The decrement button, for a caller that wants to give it an icon.

Returns

the decrement button

getIncrementButton

public Button getIncrementButton()

The increment button, for a caller that wants to give it an icon.

Returns

the increment button

getField

public TextField getField()

The editable field, for a caller that wants to make it read-only.

Returns

the text field

addActionListener

public void addActionListener(ActionListener l)

Notified when the value changes, however it changed.

Parameters

• l: the listener

removeActionListener

public void removeActionListener(ActionListener l)

Stops notifying a listener.

Parameters

• l: the listener