com.badlogic.gdx.scenes.scene2d.ui

Class ProgressBar

java.lang.Object

com.badlogic.gdx.scenes.scene2d.Actor

com.badlogic.gdx.scenes.scene2d.ui.Widget

com.badlogic.gdx.scenes.scene2d.ui.ProgressBar

All Implemented Interfaces:

Disableable, Layout

Direct Known Subclasses:

Slider

public class ProgressBar
extends Widget
implements Disableable

A progress bar is a widget that visually displays the progress of some activity or a value within given range. The progress bar has a range (min, max) and a stepping between each value it represents. The percentage of completeness typically starts out as an empty progress bar and gradually becomes filled in as the task or variable value progresses.

ChangeListener.ChangeEvent is fired when the progress bar knob is moved. Cancelling the event will move the knob to where it was previously.

The preferred height of a progress bar is determined by the larger of the knob and background. The preferred width of progress bar is 140, a relatively arbitrary size.

Author:

mzechner, Nathan Sweet

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ProgressBar.ProgressBarStyle The style for a progress bar, see ProgressBar.

Constructor Summary

Constructors

Constructor and Description
ProgressBar(float min, float max, float stepSize, boolean vertical, ProgressBar.ProgressBarStyle style) Creates a new progress bar.
ProgressBar(float min, float max, float stepSize, boolean vertical, Skin skin)
ProgressBar(float min, float max, float stepSize, boolean vertical, Skin skin, String styleName)

Method Summary

Methods

Modifier and Type	Method and Description
void	act(float delta) Updates the actor based on time.
void	draw(Batch batch, float parentAlpha) If this method is overridden, the super method or Widget.validate() should be called to ensure the widget is laid out.
float	getMaxValue()
float	getMinValue()
float	getPrefHeight()
float	getPrefWidth()
float	getStepSize()
ProgressBar.ProgressBarStyle	getStyle() Returns the progress bar's style.
float	getValue()
float	getVisualValue() If animating the progress bar value, this returns the value current displayed.
boolean	isDisabled()
void	setAnimateDuration(float duration) If > 0, changes to the progress bar value via setValue(float) will happen over this duration in seconds.
void	setAnimateInterpolation(Interpolation animateInterpolation) Sets the interpolation to use for setAnimateDuration(float).
void	setDisabled(boolean disabled)
void	setRange(float min, float max) Sets the range of this progress bar.
void	setSnapToValues(float[] values, float threshold) Will make this progress bar snap to the specified values, if the knob is within the threshold.
void	setStepSize(float stepSize)
void	setStyle(ProgressBar.ProgressBarStyle style)
boolean	setValue(float value) Sets the progress bar position, rounded to the nearest step size and clamped to the minimum and maximum values.

Methods inherited from class com.badlogic.gdx.scenes.scene2d.ui.Widget

getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, invalidate, invalidateHierarchy, layout, needsLayout, pack, setFillParent, setLayoutEnabled, validate

Methods inherited from class com.badlogic.gdx.scenes.scene2d.Actor

addAction, addCaptureListener, addListener, clear, clearActions, clearListeners, clipBegin, clipBegin, clipEnd, debug, drawDebug, fire, getActions, getCaptureListeners, getColor, getDebug, getHeight, getListeners, getName, getOriginX, getOriginY, getParent, getRight, getRotation, getScaleX, getScaleY, getStage, getTop, getTouchable, getUserObject, getWidth, getX, getX, getY, getY, getZIndex, hasParent, hit, isAscendantOf, isDescendantOf, isTouchable, isVisible, localToAscendantCoordinates, localToParentCoordinates, localToStageCoordinates, moveBy, notify, parentToLocalCoordinates, remove, removeAction, removeCaptureListener, removeListener, rotateBy, scaleBy, scaleBy, screenToLocalCoordinates, setBounds, setColor, setColor, setDebug, setHeight, setName, setOrigin, setOrigin, setOriginX, setOriginY, setPosition, setPosition, setRotation, setScale, setScale, setScaleX, setScaleY, setSize, setTouchable, setUserObject, setVisible, setWidth, setX, setY, setZIndex, sizeBy, sizeBy, stageToLocalCoordinates, toBack, toFront, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ProgressBar

public ProgressBar(float min,
           float max,
           float stepSize,
           boolean vertical,
           Skin skin)

ProgressBar

public ProgressBar(float min,
           float max,
           float stepSize,
           boolean vertical,
           Skin skin,
           String styleName)

ProgressBar

public ProgressBar(float min,
           float max,
           float stepSize,
           boolean vertical,
           ProgressBar.ProgressBarStyle style)

Creates a new progress bar. It's width is determined by the given prefWidth parameter, its height is determined by the maximum of the height of either the progress bar NinePatch or progress bar handle TextureRegion. The min and max values determine the range the values of this progress bar can take on, the stepSize parameter specifies the distance between individual values.

E.g. min could be 4, max could be 10 and stepSize could be 0.2, giving you a total of 30 values, 4.0 4.2, 4.4 and so on.

Parameters:

min - the minimum value

max - the maximum value

stepSize - the step size between values

style - the ProgressBar.ProgressBarStyle

Method Detail

setStyle

public void setStyle(ProgressBar.ProgressBarStyle style)

getStyle

public ProgressBar.ProgressBarStyle getStyle()

Returns the progress bar's style. Modifying the returned style may not have an effect until setStyle(ProgressBarStyle) is called.

act

public void act(float delta)

Description copied from class: Actor

Updates the actor based on time. Typically this is called each frame by Stage.act(float).

The default implementation calls Action.act(float) on each action and removes actions that are complete.

Overrides:

act in class Actor

Parameters:

delta - Time in seconds since the last frame.

draw

public void draw(Batch batch,
        float parentAlpha)

Description copied from class: Widget

If this method is overridden, the super method or Widget.validate() should be called to ensure the widget is laid out.

Overrides:

draw in class Widget

parentAlpha - Should be multiplied with the actor's alpha, allowing a parent's alpha to affect all children.

getValue

public float getValue()

getVisualValue

public float getVisualValue()

If animating the progress bar value, this returns the value current displayed.

setValue

public boolean setValue(float value)

Sets the progress bar position, rounded to the nearest step size and clamped to the minimum and maximum values. clamp(float) can be overridden to allow values outside of the progress bar's min/max range.

Returns:

false if the value was not changed because the progress bar already had the value or it was canceled by a listener.

setRange

public void setRange(float min,
            float max)

Sets the range of this progress bar. The progress bar's current value is clamped to the range.

setStepSize

public void setStepSize(float stepSize)

getPrefWidth

public float getPrefWidth()

Specified by:

getPrefWidth in interface Layout

Overrides:

getPrefWidth in class Widget

getPrefHeight

public float getPrefHeight()

Specified by:

getPrefHeight in interface Layout

Overrides:

getPrefHeight in class Widget

getMinValue

public float getMinValue()

getMaxValue

public float getMaxValue()

getStepSize

public float getStepSize()

setAnimateDuration

public void setAnimateDuration(float duration)

If > 0, changes to the progress bar value via setValue(float) will happen over this duration in seconds.

setAnimateInterpolation

public void setAnimateInterpolation(Interpolation animateInterpolation)

Sets the interpolation to use for setAnimateDuration(float).

setSnapToValues

public void setSnapToValues(float[] values,
                   float threshold)

Will make this progress bar snap to the specified values, if the knob is within the threshold.

setDisabled

public void setDisabled(boolean disabled)

Specified by:

setDisabled in interface Disableable

isDisabled

public boolean isDisabled()