Events in Java

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Events
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Table 15-11 Variable
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Mouse Wheel Support in the MouseEvent Class Type
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The distance by which the mouse wheel has been moved
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wheelRotation
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Whenever the mouse wheel is moved, a MouseEvent in which the wheelRotation is set to indicate how far it has moved is delivered to the onMouseWheelMoved function of the node that contains the mouse pointerThe value is positive if the mouse wheel has been moved toward the user and negative if it has been moved awayThe magnitude of the value increases if the user moves the wheel more quicklyThere is no support for block movement, which is a mode that the user can select to request that the application that receives mouse wheel events should interpret the rotation value as the number of blocks (typically pages of text) by which to scroll rather than a number of units (typically lines) It is also not possible to configure the mouse wheel to scroll by more than one unit for each turn of the wheel Delivery of Mouse Events It is generally true, as stated earlier, that mouse events are delivered to a node when it is inside the boundary of that node However, that is not the whole storyThe code in Listing 15-13, which you will find in the file javafxnodes/MouseEvents9fx, places two rectangles and a text node into a group and registers handlers that report mouse entry, mouse exit, and mouse movement or all four nodes Figure 15-24 shows the result of running this code
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Figure 15-24
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Mouse event delivery on various nodes
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Listing 15-13
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1 2 3 4
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Mouse Event Delivery on Various Nodes
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Stage { title: "Mouse Events 9" scene: Scene { width: 280
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15 Node Variables and Events
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height: 120 content: [ Group { onMouseEntered: function(evt) { print("Group enter"); println(" node: {evtnode}, " "source: {evtsource}"); } onMouseExited: function(evt) { print("Group exit"); println(" node: {evtnode}, " "source: {evtsource}"); } onMouseMoved: function(evt) { print("Group move"); println(" node: {evtnode}, " "source: {evtsource}"); } content: [ Rectangle { x: 10 y: 10 width: 80 height: 80 fill: ColorYELLOW stroke: ColorBLACK onMouseEntered: function(evt) { print("Yellow rectangle enter"); println(" node: {evtnode}, " "source: {evtsource}"); } onMouseExited: function(evt) { print("Yellow rectangle exit"); println(" node: {evtnode}, " "source: {evtsource}"); } onMouseMoved: function(evt) { print("Yellow rectangle move"); println(" node: {evtnode}, " "source: {evtsource}"); } } Rectangle { x: 100 y: 10 width: 80 height: 80 fill: null stroke: ColorRED onMouseEntered: function(evt) { println("No-fill rectangle enter " "({evtx}, {evty})"); } onMouseExited: function(evt) {
Events
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println("No-fill rectangle exit " "({evtx}, {evty})"); } onMouseMoved: function(evt) { println("No-fill rectangle move " "({evtx}, {evty})"); } } Text { font: Font { size: 24 } x: 200 y: 40 content: "Text" onMouseEntered: function(evt) { println("Text enter ({evtx}, } onMouseExited: function(evt) { println("Text exit ({evtx}, } onMouseMoved: function(evt) { println("Text move ({evtx}, } pickOnBounds: false } ] } ] } }
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The rectangle on the left is filled with a solid color, and if you move the mouse over it, you will find that events are delivered, as described earlier in this chapter Here is a typical sequence of events generated as the mouse moves into this rectangle from the left of the window:
Yellow rectangle enter node: Rectangle, source: Rectangle Group enter node: Group, source: Rectangle Yellow rectangle move node: Rectangle, source: Rectangle Group move node: Group, source: Rectangle Yellow rectangle move node: Rectangle, source: Rectangle Group move node: Group, source: Rectangle Yellow rectangle move node: Rectangle, source: Rectangle Group move node: Group, source: Rectangle
As you would expect, events are delivered to the rectangle as the mouse enters and moves over itYou will also notice that these same events are delivered to the groupThis happens because the rectangle is a child of the group node; mouse events are always propagated to the parent of a node unless that node prevents it by setting its blocksMouse variable to trueThis is not the same as the propagation that you saw ear-