Mouse Events in Java

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The JavaFX runtime reports mouse events by calling functions that you can assign to any of the eight node variables listed in Table 15-5
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Table 15-5 Variable
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Node Function Variables for Mouse Event Reporting Function Argument
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MouseEvent MouseEvent MouseEvent MouseEvent
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When Called
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As the mouse enters the area occupied by the node As the mouse leaves the area occupied by the node When the mouse is pressed while it is over the node When the mouse is released while it is over the node, or after a mouse drag operation When the mouse is clicked one or more times while over the node As the mouse is moved while it is over the node with no buttons pressed When the mouse is moved over the node with one or more buttons pressed When the user moves the mouse wheel, if there is one
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onMouseEntered onMouseExited onMousePressed onMouseReleased
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onMouseClicked onMouseMoved onMouseDragged onMouseWheelMoved
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MouseEvent MouseEvent MouseEvent MouseEvent
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Each of these variables is public and requires a function that is of Void type and which accepts a javasceneinputMouseEvent as its argument Here are the actual definitions:
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public var onMouseEntered: function(:MouseEvent):Void public var onMouseExited: function(:MouseEvent):Void public var onMousePressed: function(:MouseEvent):Void
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Events
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public public public public public
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var var var var var
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onMouseReleased: function(:MouseEvent):Void onMouseClicked: function(:MouseEvent):Void onMouseMoved: function(:MouseEvent):Void onMouseDragged: function(:MouseEvent):Void onMouseWheelMoved: function(:MouseEvent):Void
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With one exception,7 mouse events are delivered to a node only while the mouse is within its boundaries Before we look at when these events are delivered, we need to discuss the way in which JavaFX models the mouse and how this is reflected in the MouseEvent class
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The Mouse and the MouseEvent Class
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The JavaFX GUI library models the mouse as a device that enables the user to move the cursor around the screen, with three buttons that may be in either a pressed or released state at any given timeThese characteristics of the mouse are reflected in the variables of the MouseEvent object that is passed to all the mouse-related callback methods Some mice also have (or can simulate) a wheel that can be rotated either toward or away from the userThis aspect of the mouse is covered in The Mouse Wheel section, later in this chapter On a mobile device, the mouse might actually be a stylus that is used to tap the screen, or even the user s finger The MouseEvent object has a large number of variables, all of which we discuss in this section MouseEvent objects are created only by the JavaFX GUI runtime, so all its variables are read-only to application codeTable 15-6 lists the more commonly used of these variables
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Table 15-6 Variable
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node
Some Common Variables of the MouseEvent Class Type
Node
Access
Description
The node to which this event is delivered This is one of the nodes that the mouse is currently over, except in the case of a mouse drag event See the section Mouse Dragging, later in this chapter, for further information The node that is immediately under the mouse (except in the case of a mouse drag event) See the section Mouse Event Propagation, later in this chapter, for the difference between this variable and the node variable
source
Node
The exception is the mouse dragged event, as described in the Mouse Dragging section, later in this chapter
15 Node Variables and Events
Number
The x coordinate of the mouse when the event was created, relative to the origin of the node given by the node variable The y coordinate of the mouse when the event was created, relative to the origin of the node given by the node variable The x coordinate of the mouse when the event was created, relative to the scene containing the source node The y coordinate of the mouse when the event was created, relative to the scene containing the source node The x coordinate of the mouse when the event was created, relative to the user s screen The y coordinate of the mouse when the event was created, relative to the user s screen