CSE_205 GUI_Mouse_events.ppt.pdf

CSE205

Object-Oriented Programming and

Data Structures

GUI

(Graphical User Interface)

Introduction

A MouseEvent is fired whenever a mouse button is pressed, released,

clicked, moved, or dragged on a node or a scene.

The MouseEvent object captures the event, such as the location (the x-

and y-coordinates) of the mouse, the number of clicks associated with it

or which mouse button was pressed, etc.

For example the following line checks whether the primary (left)

mouse button was pressed.

if(event.getButton() == MouseButton.PRIMARY)

{

//……

}

MouseEvent

To check whether the mouse key is pressed, released, clicked,

moved, or dragged, we can write, for example the following code:

if(event.getEventType()== MouseEvent.MOUSE_PRESSED)

{

//handle mouse press here

//……

}

User Action Source Event Type Registration Method

Mouse pressed

Mouse released

Mouse clicked

Mouse entered

Mouse exited

Mouse moved

Mouse dragged

Node,

Scene

MouseEvent setOnMousePressed(EventHandler<MouseEvent>)

setOnMouseReleased(EventHandler<MouseEvent>)

setOnMouseClicked(EventHandler<MouseEvent>)

setOnMouseEntered(EventHandler<MouseEvent>)

setOnMouseExited(EventHandler<MouseEvent>)

setOnMouseMoved(EventHandler<MouseEvent>)

setOnMouseDragged(EventHandler<MouseEvent>)

The following table list the registration method for

different mouse actions.

Handle Mouse Press Event (see DotDemoOne.java and DotsPaneDemo.java)

Handle Mouse Press-Drag-Release Event (see MousePressDragReleaseDemo.java

and CirclePane.java)