All Implemented Interfaces:

ActionListener, EventListener
```
public class TopLevel
extends Object
implements ActionListener
```
A top-level window with optional menu bar. A TopLevel primarily exists to contain Widgets. The general technique is to extend TopLevel. Most of the methods here are protected: the intent is that any calls to them are from within your extension class, thus allowing the latter to retain control over its size, menu, etc.

Field Summary

Fields
Modifier and Type Field Description

protected JFrame frame
The Swing frame representing this TopLevel object.

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`TopLevel(String title, boolean exitOnClose)`	A new TopLevel with the given TITLE (which window managers typically display on the border).

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`actionPerformed(ActionEvent e)`
`protected void`	`add(Widget widget, LayoutSpec layout)`	Add WIDGET, placed according to LAYOUT.
`protected void`	`addButton(String label, Consumer<String> func, LayoutSpec layout)`	Add a new button displaying LABEL, laid out according to LAYOUT, which when clicked calls FUNC, with the button and LABEL as its arguments.
`protected void`	`addCheckBox(String label, boolean selected, Consumer<String> func, LayoutSpec layout)`	Add a new check box displaying LABEL, laid out according to LAYOUT, which when clicked calls FUNC, with the button and LABEL as its arguments.
`protected void`	`addLabel(String text, String id, LayoutSpec layout)`	Add a label that initially displays the text TEXT, placed according to LAYOUT, and identified by the tag ID.
`protected void`	`addLabel(String text, LayoutSpec layout)`	Add a new, anonymous label that displays the text TEXT, placed according to LAYOUT.
`protected void`	`addMenuButton(String label, Consumer<String> func)`	Add a new simple menu button labeled LABEL to my menus, which when clicked, invokes FUNC, sending LABEL as argument.
`protected void`	`addMenuCheckBox(String label, boolean selected, Consumer<String> func)`	Add a check box labeled LABEL to my menus, which when clicked, flips its state and invokes FUNC, sending LABEL as arguments.
`protected void`	`addMenuRadioButton(String label, String groupName, boolean selected, Consumer<String> func)`	Add a radio button labeled LABEL to my menus, belonging to the group of buttons called GROUPNAME.
`protected void`	`addRadioButton(String label, String groupName, boolean selected, Consumer<String> func, LayoutSpec layout)`	Add a radio button labeled LABEL, placed according to LAYOUT, belonging to the group of buttons called GROUPNAME.
`protected void`	`addSeparator(String label)`	Add a separator to the end of the menu labeled LABEL (which must exist) in my menu bar.
`void`	`display(boolean visible)`	If VISIBLE, display this TopLevel.
`int`	`getHeight()`	Return my current height in pixels.
`String`	`getTextInput(String message, String title, String type, String init)`	Display a dialog box with message MESSAGE and title TITLE that prompts the user for textual input, with INIT providing the initial value of the text.
`String[]`	`getTextInputs(String topMessage, String title, String type, int textWidth, String... requests)`	Display a dialog box that requests and returns input from multiple text fields.
`int`	`getWidth()`	Return my current width in pixels.
`protected boolean`	`isSelected(String label)`	Return true iff the button named LABEL is currently selected.
`protected void`	`select(String label, boolean val)`	Set isSelected(LABEL) to VAL, if LABEL is a valid button.
`protected void`	`setEnabled(boolean enable, String... labels)`	Set the enabled status of the buttons labeled LABELS[0], ...
`protected void`	`setLabel(String id, String text)`	Set the text of the existing label with tag ID to TEXT.
`void`	`setMaximumSize(int width, int height)`	Set my maximum size to WIDTH x HEIGHT pixels.
`void`	`setMinimumSize(int width, int height)`	Set my minimum size to WIDTH x HEIGHT pixels.
`void`	`setPreferredFocus(Widget widget)`	When the focus is in my window, request that WIDGET, which should be one of my components, get the focus.
`void`	`setPreferredSize(int width, int height)`	Set my preferred size to WIDTH x HEIGHT pixels.
`void`	`showMessage(String text, String title, String type)`	Display the dismissable message TEXT of type TYPE in a separate dialog window with title TITLE.
`int`	`showOptions(String message, String title, String type, String deflt, String... labels)`	Display a choice of optional responses, labeled LABELS[0],...,LABELS[n] in a separate dialog box with title TITLE and message MESSAGE.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - frame
```
protected final JFrame frame
```
    The Swing frame representing this TopLevel object.
- Constructor Detail
  - TopLevel
```
protected TopLevel(String title,
                   boolean exitOnClose)
```
    A new TopLevel with the given TITLE (which window managers typically display on the border). If EXITONCLOSE, then closing this window exits the application.
- Method Detail
  - display
```
public void display(boolean visible)
```
    If VISIBLE, display this TopLevel. Otherwise, make it invisible.
  - setPreferredSize
```
public void setPreferredSize(int width,
                             int height)
```
    Set my preferred size to WIDTH x HEIGHT pixels.
  - setMinimumSize
```
public void setMinimumSize(int width,
                           int height)
```
    Set my minimum size to WIDTH x HEIGHT pixels.
  - setMaximumSize
```
public void setMaximumSize(int width,
                           int height)
```
    Set my maximum size to WIDTH x HEIGHT pixels.
  - getWidth
```
public int getWidth()
```
    Return my current width in pixels.
  - getHeight
```
public int getHeight()
```
    Return my current height in pixels.
  - addMenuButton
```
protected void addMenuButton(String label,
                             Consumer<String> func)
```
    Add a new simple menu button labeled LABEL to my menus, which when clicked, invokes FUNC, sending LABEL as argument. A null value of FUNC indicates no action. LABEL has the form MENUNAME->SUBMENU1->...SUBMENUn->NAME, where n >= 0, (for example, "File->Open" or "File->New->Project"). This label denotes "the item labeled NAME in the submenu named SUBMENUn in the ... in the menu-bar entry MENUNAME. The new button appears at the end of its menu. Likewise, any previously non-existing menus get created at the end of the menu bar or their containing menu.
  - addMenuCheckBox
```
protected void addMenuCheckBox(String label,
                               boolean selected,
                               Consumer<String> func)
```
    Add a check box labeled LABEL to my menus, which when clicked, flips its state and invokes FUNC, sending LABEL as arguments. LABEL is as for addMenuButton. The box is initially checked iff CHECKED. A null value of FUNC indicates no action (aside from changing selection state).
  - addMenuRadioButton
```
protected void addMenuRadioButton(String label,
                                  String groupName,
                                  boolean selected,
                                  Consumer<String> func)
```
    Add a radio button labeled LABEL to my menus, belonging to the group of buttons called GROUPNAME. Initially, the button is selected iff SELECTED. Only one radio button in a group is selected at a time (see isSelected(java.lang.String)); when the user clicks one, it becomes selected and any other button in the group is deselected. If FUNC is non-null, it denotes a function that is invoked when the button is pressed, sending LABEL as its argument.
  - addSeparator
```
protected void addSeparator(String label)
```
    Add a separator to the end of the menu labeled LABEL (which must exist) in my menu bar. LABEL has the form MENUNAME->SUBMENU1->...->SUBMENUn.
  - isSelected
```
protected boolean isSelected(String label)
```
    Return true iff the button named LABEL is currently selected.
  - select
```
protected void select(String label,
                      boolean val)
```
    Set isSelected(LABEL) to VAL, if LABEL is a valid button.
  - setEnabled
```
protected void setEnabled(boolean enable,
                          String... labels)
```
    Set the enabled status of the buttons labeled LABELS[0], ... to ENABLE. An ENABLE value of false causes the buttons to become unresponsive, typically displaying as being grayed out.
  - addButton
```
protected void addButton(String label,
                         Consumer<String> func,
                         LayoutSpec layout)
```
    Add a new button displaying LABEL, laid out according to LAYOUT, which when clicked calls FUNC, with the button and LABEL as its arguments.
  - addCheckBox
```
protected void addCheckBox(String label,
                           boolean selected,
                           Consumer<String> func,
                           LayoutSpec layout)
```
    Add a new check box displaying LABEL, laid out according to LAYOUT, which when clicked calls FUNC, with the button and LABEL as its arguments. It is initially selected iff SELECTED.
  - addRadioButton
```
protected void addRadioButton(String label,
                              String groupName,
                              boolean selected,
                              Consumer<String> func,
                              LayoutSpec layout)
```
    Add a radio button labeled LABEL, placed according to LAYOUT, belonging to the group of buttons called GROUPNAME. Initially, the button is selected iff SELECTED. Only one radio button in a group is selected at a time (see isSelected(java.lang.String)); when the user clicks one, it becomes selected and any other button in the group is deselected. If FUNC is non-null, FUNC is invoked when pressed, sending the LABEL as argument.
  - add
```
protected void add(Widget widget,
                   LayoutSpec layout)
```
    Add WIDGET, placed according to LAYOUT.
  - addLabel
```
protected void addLabel(String text,
                        String id,
                        LayoutSpec layout)
```
    Add a label that initially displays the text TEXT, placed according to LAYOUT, and identified by the tag ID. If a label with the same ID already exists, its text is altered to TEXT.
  - setLabel
```
protected void setLabel(String id,
                        String text)
```
    Set the text of the existing label with tag ID to TEXT.
  - addLabel
```
protected void addLabel(String text,
                        LayoutSpec layout)
```
    Add a new, anonymous label that displays the text TEXT, placed according to LAYOUT.
  - showMessage
```
public void showMessage(String text,
                        String title,
                        String type)
```
    Display the dismissable message TEXT of type TYPE in a separate dialog window with title TITLE. TYPE may be any of the strings "information", "warning", "error", or "plain", which modify the look of the message.
  - showOptions
```
public int showOptions(String message,
                       String title,
                       String type,
                       String deflt,
                       String... labels)
```
    Display a choice of optional responses, labeled LABELS[0],...,LABELS[n] in a separate dialog box with title TITLE and message MESSAGE. Returns the selected option (0 -- n), or -1 if the user closes the dialog window. DEFLT is the default label (may be null). TYPE may be "question", "information", "warning", "error", or "plain".
  - getTextInput
```
public String getTextInput(String message,
                           String title,
                           String type,
                           String init)
```
    Display a dialog box with message MESSAGE and title TITLE that prompts the user for textual input, with INIT providing the initial value of the text. TYPE may be "question", "information", "warning", "error", or "plain". Return the user's input text, or null if the user closes the dialog window.
  - getTextInputs
```
public String[] getTextInputs(String topMessage,
                              String title,
                              String type,
                              int textWidth,
                              String... requests)
```
    Display a dialog box that requests and returns input from multiple text fields. TITLE is the title of the dialog window. TOPMESSAGE is a message placed above the input entries. TYPE may be "question", "information", "warning", "error", or "plain", indicating the style of dialog desired. TEXTWIDTH is the common width of the text input fields. REQUESTS is a non-empty, even-length sequence containing pairs label, init, where label gives the text placed to the right of a text input area, and init is that area's initial contents (may be null). Returns the users responses in the order their specifications appear in REQUESTS, or null if the user cancels the request.
  - setPreferredFocus
```
public void setPreferredFocus(Widget widget)
```
    When the focus is in my window, request that WIDGET, which should be one of my components, get the focus.
  - actionPerformed
```
public void actionPerformed(ActionEvent e)
```
    Specified by:
    
    actionPerformed in interface ActionListener

Class TopLevel

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

frame

Constructor Detail

TopLevel

Method Detail

display

setPreferredSize

setMinimumSize

setMaximumSize

getWidth

getHeight

addMenuButton

addMenuCheckBox

addMenuRadioButton

addSeparator

isSelected

select

setEnabled

addButton

addCheckBox

addRadioButton

add

addLabel

setLabel

addLabel

showMessage

showOptions

getTextInput

getTextInputs

setPreferredFocus

actionPerformed