FormView (Java SE 26 & JDK 26)
Description: declaration: module: java.desktop, package: javax.swing.text.html, class: FormView
Keywords: javax.swing.text.html.FormView class

# Class FormView

java.lang.Object
javax.swing.text.View
javax.swing.text.ComponentView
javax.swing.text.html.FormView

All Implemented Interfaces:
  `ActionListener, EventListener, SwingConstants`

public class FormView extends ComponentView implements ActionListener
Component decorator that implements the view interface for form elements, <input>, <textarea>, and <select>. The model for the component is stored as an attribute of the element (using StyleConstants.ModelAttribute), and is used to build the component of the view. The type of the model is assumed to of the type that would be set by `HTMLDocument.HTMLReader.FormAction`. If there are multiple views mapped over the document, they will share the embedded component models.

The following table shows what components get built by this view.

Shows what components get built by this view
Element Type | Component built
--- | ---
input, type button | JButton
input, type checkbox | JCheckBox
input, type image | JButton
input, type password | JPasswordField
input, type radio | JRadioButton
input, type reset | JButton
input, type submit | JButton
input, type text | JTextField
select, size > 1 or multiple attribute defined | JList in a JScrollPane
select, size unspecified or 1 | JComboBox
textarea | JTextArea in a JScrollPane
input, type file | JTextField

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `protected class`
  `FormView.MouseEventListener`
  MouseEventListener class to handle form submissions when an input with type equal to image is clicked on.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `RESET`
  Deprecated.
  As of 1.3, value comes from UIManager UIManager property FormView.resetButtonText
  `static final String`
  `SUBMIT`
  Deprecated.
  As of 1.3, value now comes from UIManager property FormView.submitButtonText

  ### Fields declared in class View

  `BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS`
  Modifier and Type
  Field
  Description
  `static final int`
  `BadBreakWeight`
  The weight to indicate a view is a bad break opportunity for the purpose of formatting.
  `static final int`
  `ExcellentBreakWeight`
  The weight to indicate a view supports breaking, and this represents a very attractive place to break.
  `static final int`
  `ForcedBreakWeight`
  The weight to indicate a view supports breaking, and must be broken to be represented properly when placed in a view that formats its children by breaking them.
  `static final int`
  `GoodBreakWeight`
  The weight to indicate a view supports breaking, but better opportunities probably exist.
  `static final int`
  `X_AXIS`
  Axis for format/break operations.
  `static final int`
  `Y_AXIS`
  Axis for format/break operations.

  ### Fields declared in interface SwingConstants

  `BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST`
  Modifier and Type
  Field
  Description
  `static final int`
  `BOTTOM`
  Box-orientation constant used to specify the bottom of a box.
  `static final int`
  `CENTER`
  The central position in an area.
  `static final int`
  `EAST`
  Compass-direction east (right).
  `static final int`
  `HORIZONTAL`
  Horizontal orientation.
  `static final int`
  `LEADING`
  Identifies the leading edge of text for use with left-to-right and right-to-left languages.
  `static final int`
  `LEFT`
  Box-orientation constant used to specify the left side of a box.
  `static final int`
  `NEXT`
  Identifies the next direction in a sequence.
  `static final int`
  `NORTH`
  Compass-direction North (up).
  `static final int`
  `NORTH_EAST`
  Compass-direction north-east (upper right).
  `static final int`
  `NORTH_WEST`
  Compass-direction north west (upper left).
  `static final int`
  `PREVIOUS`
  Identifies the previous direction in a sequence.
  `static final int`
  `RIGHT`
  Box-orientation constant used to specify the right side of a box.
  `static final int`
  `SOUTH`
  Compass-direction south (down).
  `static final int`
  `SOUTH_EAST`
  Compass-direction south-east (lower right).
  `static final int`
  `SOUTH_WEST`
  Compass-direction south-west (lower left).
  `static final int`
  `TOP`
  Box-orientation constant used to specify the top of a box.
  `static final int`
  `TRAILING`
  Identifies the trailing edge of text for use with left-to-right and right-to-left languages.
  `static final int`
  `VERTICAL`
  Vertical orientation.
  `static final int`
  `WEST`
  Compass-direction west (left).

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `FormView(Element elem)`
  Creates a new FormView object.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `actionPerformed(ActionEvent evt)`
  Responsible for processing the ActionEvent.
  `protected Component`
  `createComponent()`
  Create the component.
  `float`
  `getMaximumSpan(int axis)`
  Determines the maximum span for this view along an axis.
  `protected void`
  `imageSubmit(String imageData)`
  This method is called to submit a form in response to a click on an image -- an <INPUT> form element of type "image".
  `protected void`
  `submitData(String data)`
  This method is responsible for submitting the form data.

  ### Methods declared in class ComponentView

  `getAlignment, getComponent, getMinimumSpan, getPreferredSpan, modelToView, paint, setParent, viewToModel`
  Modifier and Type
  Method
  Description
  `float`
  `getAlignment(int axis)`
  Determines the desired alignment for this view along an axis.
  `final Component`
  `getComponent()`
  Fetch the component associated with the view.
  `float`
  `getMinimumSpan(int axis)`
  Determines the minimum span for this view along an axis.
  `float`
  `getPreferredSpan(int axis)`
  Determines the preferred span for this view along an axis.
  `Shape`
  `modelToView(int pos, Shape a, Position.Bias b)`
  Provides a mapping from the coordinate space of the model to that of the view.
  `void`
  `paint(Graphics g, Shape a)`
  The real paint behavior occurs naturally from the association that the component has with its parent container (the same container hosting this view).
  `void`
  `setParent(View p)`
  Sets the parent for a child view.
  `int`
  `viewToModel(float x, float y, Shape a, Position.Bias[] bias)`
  Provides a mapping from the view coordinate space to the logical coordinate space of the model.

  ### Methods declared in class View

  `append, breakView, changedUpdate, createFragment, forwardUpdate, forwardUpdateToView, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getNextVisualPositionFrom, getParent, getResizeWeight, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, insertUpdate, isVisible, modelToView, modelToView, preferenceChanged, remove, removeAll, removeUpdate, replace, setSize, updateChildren, updateLayout, viewToModel`
  Modifier and Type
  Method
  Description
  `void`
  `append(View v)`
  Appends a single child view.
  `View`
  `breakView(int axis, int offset, float pos, float len)`
  Tries to break this view on the given axis.
  `void`
  `changedUpdate(DocumentEvent e, Shape a, ViewFactory f)`
  Gives notification from the document that attributes were changed in a location that this view is responsible for.
  `View`
  `createFragment(int p0, int p1)`
  Creates a view that represents a portion of the element.
  `protected void`
  `forwardUpdate(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a, ViewFactory f)`
  Forwards the given `DocumentEvent` to the child views that need to be notified of the change to the model.
  `protected void`
  `forwardUpdateToView(View v, DocumentEvent e, Shape a, ViewFactory f)`
  Forwards the `DocumentEvent` to the give child view.
  `AttributeSet`
  `getAttributes()`
  Fetches the attributes to use when rendering.
  `int`
  `getBreakWeight(int axis, float pos, float len)`
  Determines how attractive a break opportunity in this view is.
  `Shape`
  `getChildAllocation(int index, Shape a)`
  Fetches the allocation for the given child view.
  `Container`
  `getContainer()`
  Fetches the container hosting the view.
  `Document`
  `getDocument()`
  Fetches the model associated with the view.
  `Element`
  `getElement()`
  Fetches the structural portion of the subject that this view is mapped to.
  `int`
  `getEndOffset()`
  Fetches the portion of the model for which this view is responsible.
  `Graphics`
  `getGraphics()`
  Fetch a `Graphics` for rendering.
  `int`
  `getNextVisualPositionFrom(int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)`
  Provides a way to determine the next visually represented model location at which one might place a caret.
  `View`
  `getParent()`
  Returns the parent of the view.
  `int`
  `getResizeWeight(int axis)`
  Determines the resizability of the view along the given axis.
  `int`
  `getStartOffset()`
  Fetches the portion of the model for which this view is responsible.
  `String`
  `getToolTipText(float x, float y, Shape allocation)`
  Returns the tooltip text at the specified location.
  `View`
  `getView(int n)`
  Gets the nth child view.
  `int`
  `getViewCount()`
  Returns the number of views in this view.
  `ViewFactory`
  `getViewFactory()`
  Fetches the `ViewFactory` implementation that is feeding the view hierarchy.
  `int`
  `getViewIndex(float x, float y, Shape allocation)`
  Returns the child view index representing the given position in the view.
  `int`
  `getViewIndex(int pos, Position.Bias b)`
  Returns the child view index representing the given position in the model.
  `void`
  `insert(int offs, View v)`
  Inserts a single child view.
  `void`
  `insertUpdate(DocumentEvent e, Shape a, ViewFactory f)`
  Gives notification that something was inserted into the document in a location that this view is responsible for.
  `boolean`
  `isVisible()`
  Returns a boolean that indicates whether the view is visible or not.
  `Shape`
  `modelToView(int pos, Shape a)`
  Deprecated.
  `Shape`
  `modelToView(int p0, Position.Bias b0, int p1, Position.Bias b1, Shape a)`
  Provides a mapping, for a given region, from the document model coordinate space to the view coordinate space.
  `void`
  `preferenceChanged(View child, boolean width, boolean height)`
  Child views can call this on the parent to indicate that the preference has changed and should be reconsidered for layout.
  `void`
  `remove(int i)`
  Removes one of the children at the given position.
  `void`
  `removeAll()`
  Removes all of the children.
  `void`
  `removeUpdate(DocumentEvent e, Shape a, ViewFactory f)`
  Gives notification that something was removed from the document in a location that this view is responsible for.
  `void`
  `replace(int offset, int length, View[] views)`
  Replaces child views.
  `void`
  `setSize(float width, float height)`
  Sets the size of the view.
  `protected boolean`
  `updateChildren(DocumentEvent.ElementChange ec, DocumentEvent e, ViewFactory f)`
  Updates the child views in response to receiving notification that the model changed, and there is change record for the element this view is responsible for.
  `protected void`
  `updateLayout(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a)`
  Updates the layout in response to receiving notification of change from the model.
  `int`
  `viewToModel(float x, float y, Shape a)`
  Deprecated.

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
  Modifier and Type
  Method
  Description
  `protected Object`
  `clone()`
  Creates and returns a copy of this object.
  `boolean`
  `equals(Object obj)`
  Indicates whether some other object is "equal to" this one.
  `protected void`
  `finalize()`
  Deprecated, for removal: This API element is subject to removal in a future version.
  Finalization is deprecated and subject to removal in a future release.
  `final Class<?>`
  `getClass()`
  Returns the runtime class of this `Object`.
  `int`
  `hashCode()`
  Returns a hash code value for this object.
  `final void`
  `notify()`
  Wakes up a single thread that is waiting on this object's monitor.
  `final void`
  `notifyAll()`
  Wakes up all threads that are waiting on this object's monitor.
  `String`
  `toString()`
  Returns a string representation of the object.
  `final void`
  `wait()`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
  `final void`
  `wait(long timeoutMillis)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
  `final void`
  `wait(long timeoutMillis, int nanos)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

- ## Field Details

  - ### SUBMIT

    @Deprecated public static final String SUBMIT
    Deprecated.
    As of 1.3, value now comes from UIManager property FormView.submitButtonText
    If a value attribute is not specified for a FORM input element of type "submit", then this default string is used.

  - ### RESET

    @Deprecated public static final String RESET
    Deprecated.
    As of 1.3, value comes from UIManager UIManager property FormView.resetButtonText
    If a value attribute is not specified for a FORM input element of type "reset", then this default string is used.

- ## Constructor Details

  - ### FormView

    public FormView(Element elem)
    Creates a new FormView object.
    Parameters:
      `elem` - the element to decorate

- ## Method Details

  - ### createComponent

    protected Component createComponent()
    Create the component. This is basically a big switch statement based upon the tag type and html attributes of the associated element.
    Overrides:
      `createComponent` in class `ComponentView`
    Returns:
      the component that is associated with this view

  - ### getMaximumSpan

    public float getMaximumSpan(int axis)
    Determines the maximum span for this view along an axis. For certain components, the maximum and preferred span are the same. For others this will return the value returned by Component.getMaximumSize along the axis of interest.
    Overrides:
      `getMaximumSpan` in class `ComponentView`
    Parameters:
      `axis` - may be either View.X_AXIS or View.Y_AXIS
    Returns:
      the span the view would like to be rendered into >= 0. Typically the view is told to render into the span that is returned, although there is no guarantee. The parent may choose to resize or break the view.
    Throws:
      `IllegalArgumentException` - for an invalid axis
    See Also:
      - `View.getPreferredSpan(int)`

  - ### actionPerformed

    public void actionPerformed(ActionEvent evt)
    Responsible for processing the ActionEvent. If the element associated with the FormView, has a type of "submit", "reset", "text" or "password" then the action is processed. In the case of a "submit" the form is submitted. In the case of a "reset" the form is reset to its original state. In the case of "text" or "password", if the element is the last one of type "text" or "password", the form is submitted. Otherwise, focus is transferred to the next component in the form.
    Specified by:
      `actionPerformed` in interface `ActionListener`
    Parameters:
      `evt` - the ActionEvent.

  - ### submitData

    protected void submitData(String data)
    This method is responsible for submitting the form data. A thread is forked to undertake the submission.
    Parameters:
      `data` - data to submit

  - ### imageSubmit

    protected void imageSubmit(String imageData)
    This method is called to submit a form in response to a click on an image -- an <INPUT> form element of type "image".
    Parameters:
      `imageData` - the mouse click coordinates.