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The layoutX variable of the Play button is calculated by taking the x coordinate of the right side of the node to its left, in this case the Stop button, and adding some horizontal paddingThe layoutY variable of the button is the same as that of its neighbor Because the Stop and Play buttons (and the Pause button) have the same height, this ensures that they are correctly positioned relative to each other Lines 4 to 7 of this code illustrate how a skin typically interacts with the control and the behaviorThe Play button is supposed to be visible only when the video is not already playingTo give effect to this rule, its visible variable is bound to the playing variable of the control If you look back to the control implementation in Listing 25-11, you ll see that this variable is bound to the status variable of the MediaPlayerAs a result of the binding, the visibility of the Play button will change automatically when the media starts playing or stops playingThere is similar code in the implementation of the Pause button on lines 52 to 59 of Listing 25-12 The code on lines 5 to 7 captures mouse presses on the Play buttonWhen the button is pressed, video playback should beginTo give effect to this, the mouse handler calls the playPressed() function of the behavior By decoupling the action from the mouse handler in this way, you make it possible to change what the behavior does in response to a button press without having to change the skin classThe other buttons also handle mouse presses by calling functions in the behavior class The StopButton, PlayButton, and PauseButton classes are custom nodes that provide a basic representation of a buttonWe don t use the standard Button class here because we don t need anything that complex For the sake of completeness, here s how the StopButton class is implemented:
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class StopButton extends CustomNode { override var children = Rectangle { width: controlSize height: controlSize fill: bind if (hover and barplaying) baractiveFill else barnormalFill } }
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As you can see, the only interesting feature of this class is the value assigned to its fill variableThe intent is that the color of the button should change from normalFill to activeFill if the user moves the mouse over it when playback is in progressThe condition that the mouse should be over the button is tested by using its hover variable, whereas the fact that playback is in progress is obtained from the playing variable of the MediaPlayerBar control It is worth noting that the state that this class is using is held in private variables of the skin class, so you might be wondering how it can access those variablesThe reason is that the StopButton class is actually an inner class of MediaPlayerBarSkin, because MediaPlayerBarSkin is the class for which the source file is named and the StopButton
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class is in the same source file and, as in Java, inner classes have access to all the state of the class within which they are contained (For more on this, see the section Classes and Script Files in 11, JavaFX Script Classes ) The code on lines 84 to 89 applies a lighting effect that makes the whole control look three-dimensional Because it is applied at the group level, it applies to each node equally Similarly, the handler on lines 90 to 92 also applies to every node in the group It is called when the user moves the mouse wheel while the mouse is anywhere over the control and calls a function in the behaviorAs you ll see later, this allows the user to rewind or fast forward playback by using the mouse wheel The largest part of the skin is the time slider, implemented by the TimeSlider class Here s how this class is used by the skin:
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1 2 3 4 5 6 7 8 9 10 11 12 timeSlider = TimeSlider { layoutX: bind playboundsInParentmaxX + hpad layoutY: bind playboundsInParentminY height: controlSize width: bind barwidth - beforeSlider - afterSlider thumbColor: bind thumbColor dragThumbColor: bind dragThumbColor fill: bind barnormalFill fractionBuffered: bind barfractionBuffered onMoved: function(position) { barBehaviorplayPositionChanged(position); }
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Like all the other controls, the slider is positioned relative to the control to its left (in this case, the Play button) Unlike the other controls, however, it does not have a fixed width Instead, it occupies any space that is not otherwise usedThe actual width is calculated on line 5 by subtracting the space allocated to the controls to the left and right of the slider from the total width of the MediaPlayerBar The fractionBuffered variable controls how much of the slider s body is filled to indicate the proportion of the video content that has been loaded, in the range 00 to 10 Its value is bound to the fractionBuffered variable of the control class which, as shown on lines 17 to 18 of Listing 25-11 is itself bound to the result of dividing the buffered time by the total playback timeAs more of the video is loaded, the value of fractionBuffered will increase and this will be reflected in the slider The implementation of the TimeSlider class is shown in Listing 25-13
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Listing 25-13
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