Week 9

MouseEvent Class

MouseEvent Class

An event that indicates that a mouse action occurred in a component such as pressing a mouse button.

MouseEvent

When the user presses one of the buttons on a mouse, an object that belongs to a ____________ class is constructed

Event Source

component to which the user clicked

x and y coordinates

the point in the component where the click occurred

mouse-based

To work, the mouse event type should be registered by adding the appropriate __________ Event Listener to the component.

MouseListener

used for basic mouse-oriented events

MouseListener

happens when the mouse is clicked or released

MouseMotionListener

used for the motion-oriented events

MouseMotionListener

happens whenever the mouse is moved; frequent

public void mousePressed(MouseEvent evt)

method called when the user presses down a mouse button

public void mouseReleased(MouseEvent evt)

method called when the user releases a button

public void mouseClicked(MouseEvent evt)

method called if the user presses a mouse button and then releases it, without moving the mouse.

public void mouseClicked(MouseEvent evt)

The mousePressed, mouseReleased, and mouseClicked routines are all called in that order.

mousePressed

In most cases, you should define _______ instead of mouseClicked

public void mouseEntered(MouseEvent evt)

method called when the mouse cursor enters the component.

public void mouseExited(MouseEvent evt)

method called when the mouse cursor leaves the component.

object

Registering Mouse Events: create an ______ that implements the MouseListener interface

addMouseListener()

Registering Mouse Events: register the object to listen for events by calling a component's ____________ method.

public void mouseDragged(MouseEvent evt)

method called when the user moves the mouse while holding down a mouse button until the button is released

F

public void mouseDragged(MouseEvent evt) only works if the mouse position is within the bounds of the component

T or F

public void mouseMoved(MouseEvent evt)

method called when the user moves the mouse while no mouse button is down

MouseEvent

The _______ object in the parameter contains the x and y coordinates of the mouse's location

MouseMotionListener

Registering MouseMotion Events: create an object that implements the _____________ interface

addMouseMotionListener()

register the object to listen for events by calling a component's _____________________ method

MouseListener

In most cases, the listener object will also implement the ___________ interface so that it can respond to the other mouse events as well

Menu

is a list of buttons each of which have their own corresponding action when selected

Drop-Down

Types of Menu: usually associated with an application's menubar

Pop-Up

Types of Menu: associated with any container component (i.e., often accessed via right button click)

Cascaded

Types of Menu: pops up when another menu item is selected (i.e. a sub menu)

pull-down

Types of Menu: other term for drop-down menu

JMenuBar

An object at the top of the frame that contains "pull down" menus. There can be only one per frame.

names

Only the _____ of the pull down menus are displayed on the menubar.

JMenu

A menu that may contain menu items, separator lines, and other menus.

JMenuItems

menu items which the user can select from (like buttons)

JSeparators

separator lines to divide up the items into logical groupings

action

The user selects an option and an _____ is performed

JMenu

It is added to a JMenuBar object by specifying its name (or label) which will appear on the menubar

JMenuItem

A button on a menu. When the user selects the "button", the action associated with the menu item is performed

ImageIcons

__________ can be used on menus as well by assigning an icon to a menultem (just like JButtons)

JRadioButtonMenuItem

A menu item that is part of a group of menu items in which only one item in the group can be selected

JPopupMenu

A small window which pops up and displays a menu of choices

JPopupMenu

Used for the menu that appears when the user selects an item on the menu bar (similar to cascaded menu)

JPopupMenu

Also used for "pull-right" menus that appear when the user selects a menu item that activates it

JPopupMenu

can also be used anywhere else you want a menu to appear (e.g., when the user right-clicks in a specified area)

JFrame

A single JMenuBar is added to a __________

JMenus

Multiple ______ are added to the JMenuBar

JFrame

JPopupMenus are added to _______

setJMenuBar()

method used to set the JFrame's menubar to the instance of JMenuBar

.setMnemonic();

method used to set the keyboard accelerators (i.e., quick keys)

dialog box

a separate window that pops up in response to an event occurring in a window

dialog box

often used to obtain information from the user

Message Dialog

displays a message indicating information, errors, warnings etc

Confirmation Dialog

asks a question such as yes/no

Input Dialog

asks for some kind of input

Option Dialog

asks the user to select some option