javafx.scene.control.ToggleButton Maven / Gradle / Ivy
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package javafx.scene.control;
import com.sun.javafx.scene.ParentHelper;
import com.sun.javafx.scene.traversal.ParentTraversalEngine;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.BooleanPropertyBase;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ObjectPropertyBase;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.WritableValue;
import javafx.event.ActionEvent;
import javafx.geometry.Pos;
import javafx.scene.AccessibleAttribute;
import javafx.scene.AccessibleRole;
import javafx.scene.Node;
import javafx.css.PseudoClass;
import javafx.scene.control.skin.ToggleButtonSkin;
import javafx.css.StyleableProperty;
/**
* A {@code ToggleButton} is a specialized control which has the ability to be
* selected. Typically a {@code ToggleButton} is rendered similarly to a Button.
* However, they are two different types of Controls. A Button is a "command"
* button which invokes a function when clicked. A {@code ToggleButton} on the
* other hand is simply a control with a Boolean indicating whether it has been
* selected.
*
* {@code ToggleButton} can also be placed in groups. By default, a
* {@code ToggleButton} is not in a group. When in groups, only one
* {@code ToggleButton} at a time within that group can be selected. To put two
* {@code ToggleButtons} in the same group, simply assign them both the same
* value for {@link ToggleGroup}.
*
*
* Unlike {@link RadioButton RadioButtons}, {@code ToggleButtons} in a
* {@code ToggleGroup} do not attempt to force at least one selected
* {@code ToggleButton} in the group. That is, if a {@code ToggleButton} is
* selected, clicking on it will cause it to become unselected. With
* {@code RadioButton}, clicking on the selected button in the group will have
* no effect.
*
*
* Example:
* ToggleButton tb1 = new ToggleButton("toggle button 1");
* ToggleButton tb2 = new ToggleButton("toggle button 2");
* ToggleButton tb3 = new ToggleButton("toggle button 3");
* ToggleGroup group = new ToggleGroup();
* tb1.setToggleGroup(group);
* tb2.setToggleGroup(group);
* tb3.setToggleGroup(group);
*
* 
*
*
* MnemonicParsing is enabled by default for ToggleButton.
*
* @since JavaFX 2.0
*/
// TODO Mention the semantics when binding "selected" on multiple toggle buttons
// which are all on the same toggle group, and how the selected state on the
// toggle group is affected or not in such a case.
public class ToggleButton extends ButtonBase implements Toggle {
/* *************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Creates a toggle button with an empty string for its label.
*/
public ToggleButton() {
initialize();
}
/**
* Creates a toggle button with the specified text as its label.
*
* @param text A text string for its label.
*/
public ToggleButton(String text) {
setText(text);
initialize();
}
/**
* Creates a toggle button with the specified text and icon for its label.
*
* @param text A text string for its label.
* @param graphic the icon for its label.
*/
public ToggleButton(String text, Node graphic) {
setText(text);
setGraphic(graphic);
initialize();
}
private void initialize() {
getStyleClass().setAll(DEFAULT_STYLE_CLASS);
setAccessibleRole(AccessibleRole.TOGGLE_BUTTON);
// alignment is styleable through css. Calling setAlignment
// makes it look to css like the user set the value and css will not
// override. Initializing alignment by calling set on the
// CssMetaData ensures that css will be able to override the value.
((StyleableProperty)(WritableValue)alignmentProperty()).applyStyle(null, Pos.CENTER);
setMnemonicParsing(true); // enable mnemonic auto-parsing by default
}
/* *************************************************************************
* *
* Properties *
* *
**************************************************************************/
/**
* Indicates whether this toggle button is selected. This can be manipulated
* programmatically.
*/
private BooleanProperty selected;
public final void setSelected(boolean value) {
selectedProperty().set(value);
}
public final boolean isSelected() {
return selected == null ? false : selected.get();
}
public final BooleanProperty selectedProperty() {
if (selected == null) {
selected = new BooleanPropertyBase() {
@Override protected void invalidated() {
final boolean selected = get();
final ToggleGroup tg = getToggleGroup();
// Note: these changes need to be done before selectToggle/clearSelectedToggle since
// those operations change properties and can execute user code, possibly modifying selected property again
pseudoClassStateChanged(PSEUDO_CLASS_SELECTED, selected);
notifyAccessibleAttributeChanged(AccessibleAttribute.SELECTED);
if (tg != null) {
if (selected) {
tg.selectToggle(ToggleButton.this);
} else if (tg.getSelectedToggle() == ToggleButton.this) {
tg.clearSelectedToggle();
}
}
}
@Override
public Object getBean() {
return ToggleButton.this;
}
@Override
public String getName() {
return "selected";
}
};
}
return selected;
}
/**
* The {@link ToggleGroup} to which this {@code ToggleButton} belongs. A
* {@code ToggleButton} can only be in one group at any one time. If the
* group is changed, then the button is removed from the old group prior to
* being added to the new group.
*/
private ObjectProperty toggleGroup;
public final void setToggleGroup(ToggleGroup value) {
toggleGroupProperty().set(value);
}
public final ToggleGroup getToggleGroup() {
return toggleGroup == null ? null : toggleGroup.get();
}
public final ObjectProperty toggleGroupProperty() {
if (toggleGroup == null) {
toggleGroup = new ObjectPropertyBase() {
private ToggleGroup old;
private ChangeListener listener = (o, oV, nV) ->
ParentHelper.getTraversalEngine(ToggleButton.this).setOverriddenFocusTraversability(nV != null ? isSelected() : null);
@Override protected void invalidated() {
final ToggleGroup tg = get();
if (tg != null && !tg.getToggles().contains(ToggleButton.this)) {
if (old != null) {
old.getToggles().remove(ToggleButton.this);
}
tg.getToggles().add(ToggleButton.this);
final ParentTraversalEngine parentTraversalEngine = new ParentTraversalEngine(ToggleButton.this);
ParentHelper.setTraversalEngine(ToggleButton.this, parentTraversalEngine);
// If there's no toggle selected, do not override
parentTraversalEngine.setOverriddenFocusTraversability(tg.getSelectedToggle() != null ? isSelected() : null);
tg.selectedToggleProperty().addListener(listener);
} else if (tg == null) {
old.selectedToggleProperty().removeListener(listener);
old.getToggles().remove(ToggleButton.this);
ParentHelper.setTraversalEngine(ToggleButton.this, null);
}
old = tg;
}
@Override
public Object getBean() {
return ToggleButton.this;
}
@Override
public String getName() {
return "toggleGroup";
}
};
}
return toggleGroup;
}
/* *************************************************************************
* *
* Methods *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override public void fire() {
// TODO (aruiz): if (!isReadOnly(isSelected()) {
if (!isDisabled()) {
setSelected(!isSelected());
fireEvent(new ActionEvent());
}
}
/** {@inheritDoc} */
@Override protected Skin createDefaultSkin() {
return new ToggleButtonSkin(this);
}
/* *************************************************************************
* *
* Stylesheet Handling *
* *
**************************************************************************/
private static final String DEFAULT_STYLE_CLASS = "toggle-button";
private static final PseudoClass PSEUDO_CLASS_SELECTED =
PseudoClass.getPseudoClass("selected");
/**
* Returns the initial alignment state of this control, for use
* by the JavaFX CSS engine to correctly set its initial value. This method
* is overridden to use Pos.CENTER initially.
*
* @since 9
*/
@Override protected Pos getInitialAlignment() {
return Pos.CENTER;
}
/* *************************************************************************
* *
* Accessibility handling *
* *
**************************************************************************/
/** {@inheritDoc} */
@Override
public Object queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters) {
switch (attribute) {
case SELECTED: return isSelected();
default: return super.queryAccessibleAttribute(attribute, parameters);
}
}
}
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