javafx.scene.control.ProgressIndicator Maven / Gradle / Ivy
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package javafx.scene.control;
import javafx.css.PseudoClass;
import javafx.scene.control.skin.ProgressIndicatorSkin;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.DoublePropertyBase;
import javafx.beans.property.ReadOnlyBooleanProperty;
import javafx.beans.property.ReadOnlyBooleanWrapper;
import javafx.beans.value.WritableValue;
import javafx.css.StyleableProperty;
import javafx.scene.AccessibleAttribute;
import javafx.scene.AccessibleRole;
/**
* A circular control which is used for indicating progress, either
* infinite (aka indeterminate) or finite. Often used with the Task API for
* representing progress of background Tasks.
*
* ProgressIndicator sets focusTraversable to false.
*
*
*
* This first example creates a ProgressIndicator with an indeterminate value :
*
* import javafx.scene.control.ProgressIndicator;
* ProgressIndicator p1 = new ProgressIndicator();
*
*
*
* This next example creates a ProgressIndicator which is 25% complete :
*
* import javafx.scene.control.ProgressIndicator;
* ProgressIndicator p2 = new ProgressIndicator();
* p2.setProgress(0.25F);
*
*
* Implementation of ProgressIndicator According to JavaFX UI Control API Specification
* @since JavaFX 2.0
*/
public class ProgressIndicator extends Control {
/**
* Value for progress indicating that the progress is indeterminate.
*
* @see #setProgress
*/
public static final double INDETERMINATE_PROGRESS = -1;
/***************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Creates a new indeterminate ProgressIndicator.
*/
public ProgressIndicator() {
this(INDETERMINATE_PROGRESS);
}
/**
* Creates a new ProgressIndicator with the given progress value.
* @param progress the progress, represented as a value between 0 and 1
*/
public ProgressIndicator(double progress) {
// focusTraversable is styleable through css. Calling setFocusTraversable
// makes it look to css like the user set the value and css will not
// override. Initializing focusTraversable by calling applyStyle with null
// StyleOrigin ensures that css will be able to override the value.
((StyleableProperty)(WritableValue)focusTraversableProperty()).applyStyle(null, Boolean.FALSE);
setProgress(progress);
getStyleClass().setAll(DEFAULT_STYLE_CLASS);
setAccessibleRole(AccessibleRole.PROGRESS_INDICATOR);
// need to initialize pseudo-class state
final int c = Double.compare(INDETERMINATE_PROGRESS, progress);
pseudoClassStateChanged(PSEUDO_CLASS_INDETERMINATE, c == 0);
pseudoClassStateChanged(PSEUDO_CLASS_DETERMINATE, c != 0);
}
/***************************************************************************
* *
* Properties *
* *
**************************************************************************/
/**
* A flag indicating whether it is possible to determine the progress
* of the ProgressIndicator. Typically indeterminate progress bars are
* rendered with some form of animation indicating potentially "infinite"
* progress.
*/
private ReadOnlyBooleanWrapper indeterminate;
private void setIndeterminate(boolean value) {
indeterminatePropertyImpl().set(value);
}
public final boolean isIndeterminate() {
return indeterminate == null ? true : indeterminate.get();
}
public final ReadOnlyBooleanProperty indeterminateProperty() {
return indeterminatePropertyImpl().getReadOnlyProperty();
}
private ReadOnlyBooleanWrapper indeterminatePropertyImpl() {
if (indeterminate == null) {
indeterminate = new ReadOnlyBooleanWrapper(true) {
@Override protected void invalidated() {
final boolean active = get();
pseudoClassStateChanged(PSEUDO_CLASS_INDETERMINATE, active);
pseudoClassStateChanged(PSEUDO_CLASS_DETERMINATE, !active);
}
@Override
public Object getBean() {
return ProgressIndicator.this;
}
@Override
public String getName() {
return "indeterminate";
}
};
}
return indeterminate;
}
/**
* The actual progress of the ProgressIndicator. A negative value for
* progress indicates that the progress is indeterminate. A positive value
* between 0 and 1 indicates the percentage of progress where 0 is 0% and 1
* is 100%. Any value greater than 1 is interpreted as 100%.
*/
private DoubleProperty progress;
public final void setProgress(double value) {
progressProperty().set(value);
}
public final double getProgress() {
return progress == null ? INDETERMINATE_PROGRESS : progress.get();
}
public final DoubleProperty progressProperty() {
if (progress == null) {
progress = new DoublePropertyBase(-1.0) {
@Override protected void invalidated() {
setIndeterminate(getProgress() < 0.0);
}
@Override
public Object getBean() {
return ProgressIndicator.this;
}
@Override
public String getName() {
return "progress";
}
};
}
return progress;
}
/***************************************************************************
* *
* Methods *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override protected Skin createDefaultSkin() {
return new ProgressIndicatorSkin(this);
}
/***************************************************************************
* *
* Stylesheet Handling *
* *
**************************************************************************/
/**
* Initialize the style class to 'progress-indicator'.
*
* This is the selector class from which CSS can be used to style
* this control.
*/
private static final String DEFAULT_STYLE_CLASS = "progress-indicator";
/**
* Pseudoclass indicating this is a determinate (i.e., progress can be
* determined) progress indicator.
*/
private static final PseudoClass PSEUDO_CLASS_DETERMINATE =
PseudoClass.getPseudoClass("determinate");
/**
* Pseudoclass indicating this is an indeterminate (i.e., progress cannot
* be determined) progress indicator.
*/
private static final PseudoClass PSEUDO_CLASS_INDETERMINATE =
PseudoClass.getPseudoClass("indeterminate");
/**
* Returns the initial focus traversable state of this control, for use
* by the JavaFX CSS engine to correctly set its initial value. This method
* is overridden as by default UI controls have focus traversable set to true,
* but that is not appropriate for this control.
*
* @since 9
*/
@Override protected Boolean getInitialFocusTraversable() {
return Boolean.FALSE;
}
/***************************************************************************
* *
* Accessibility handling *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override
public Object queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters) {
switch (attribute) {
case VALUE: return getProgress();
case MAX_VALUE: return 1.0;
case MIN_VALUE: return 0.0;
case INDETERMINATE: return isIndeterminate();
default: return super.queryAccessibleAttribute(attribute, parameters);
}
}
}