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If you don t set the icons variable, a default image is used Visibility When read, the visible variable reflects whether the stage is currently visible; when set, it changes the visible state, causing the stage to appear or disappearThe default value is true, so the stage will be made visible after initialization unless the object literal explicitly assigns the value false In Listing 14-1, the code on lines 19 to 21 attaches a trigger to a variable that is bound to the visible state of the stage and prints its value whenever it changes Running this example and then immediately closing the window results in the following output from the trigger, reflecting the fact that the stage is initially visible and then becomes invisible when it is closed:
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Stage Stage Stage Stage contains visible contains visible focus false true focus true false
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It does not follow that a visible stage can actually be seen by the user On the desktop, for example, the stage s top-level window may be partly or completely obscured by other windows or it may be iconified Moving another window to obscure the stage s window has no effect on this variable In fact, there is no way to know whether the user can actually see the stage containsFocus The containsFocus variable reflects whether the stage s top-level container is the active one on the user s screen On the desktop, this means that the stage is in the window that the user is currently working with and to which keyboard presses will be directedThe
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active window is usually rendered differently from other windows so that the user can easily identify itThis is typically done by changing the color of its title bar The containsFocus variable is read-only to application code Its value changes as users change the focus of their work On lines 16 to 18 of Listing 14-1, a trigger is attached to a variable that is bound to its value, to allow state changes to be tracked When this example is run, the stage becomes the active window, and the focused variable is set to trueActivating a different window by clicking it causes the stage to be deactivated, and the value of this variable changes to false Z-Order Control The stage has two functions that let you raise or lower its top-level window on the desktop:
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public function toFront():Void public function toBack():Void
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What these functions actually do depends on the host platformAll that you can rely on is that toFront()moves the stage on which it is invoked so that it is in front of any other stages belonging to the same application Similarly, toBack()moves the stage so that it is behind all the other stages in the application and possibly behind windows belonging to other applicationsThe relative positioning of stages is referred to as the Z-order, which makes sense if you imagine a coordinate system in which the X and Y axes lie respectively along the top and the left side of screen and the Z extends vertically outward from the screen s surface The code in Listing 14-2, which you ll find in the file javafxuibasics/StageZOrderfx, demonstrates the use of these functions
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Listing 14-2
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
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package javafxuibasics; import import import import import javafxanimationKeyFrame; javafxanimationTimeline; javafxsceneScene; javafxscenetextText; javafxstageStage;
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var stage1 = Stage { title: "Stage 1" x: 100 y: 200 scene: Scene { content: Text { content: "Stage 1" y: 20 } }
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18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
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} Stage { title: "Stage 2" x: 150 y: 250 scene: Scene { content: Text { content: "Stage 2" y:20 } } } var timeline = Timeline { repeatCount: TimelineINDEFINITE autoReverse: true keyFrames: [ KeyFrame { time: 0s action: function() { stage1toFront() } }, KeyFrame { time: 5s action: function() { stage1toBack(); } } ] } timelineplay();
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This code creates two stages with nested Text objects that indicate which stage is whichThe code on lines 31 to 45 creates an animation that first moves Stage 1 to the front (on line 37) and then moves it to the back (line 41) If you run this code, you should see the two stages changing their relative positions every 5 secondsAnimation is discussed in detail in 18, Animation On some platforms, moving the stage to the front will also move the application into the foreground so that the stage appears in front of any windows belonging to other applicationsThis can be annoying for the user because he may be entering data into a spreadsheet and suddenly find that another application has taken control and is unexpectedly processing his keyboard input Some versions of the Windows platform do not allow an application to move itself into the foreground in this way, except under specific circumstances2 Because the behavior is not the same across all platforms, it is best not to use the toFront() function to activate a stage unless it is in direct response to a user action
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