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onMousePressed: function(evt) { lastX = evtx; lastY = evty; imageViewcursor = CursorMOVE } onMouseDragged: function(evt) { var deltaX = lastX - evtx; var deltaY = lastY - evty; lastX = evtx; lastY = evty; updateViewport(deltaX, deltaY); } onMouseReleased: function(evt) { imageViewcursor = CursorDEFAULT } } ] } }
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This process starts in the onMousePressed handler of the ImageView, on lines 57 to 60 Here, we save the coordinates of the mouse when it is first clicked, and then change the cursor so that it is obvious to the user that the image can be moved11 The cursor is restored on line 68, when the mouse is releasedAs the mouse is moved, the onMouseDragged handler on lines 61 to 66 is calledThe coordinates in the mouse event, together with the last saved position of the mouse, are used to calculate how far the mouse has moved, and then the current mouse position is saved for use on the next entry to this handler Finally, the updateViewport() function is called, with arguments that reflect the distance moved The job of updateViewport(), which is shown on lines 22 to 40 of Listing 16-12, is to adjust the values of the viewportX and viewportY variables by the distance by which the mouse is movedThe crucial point here is that we want the image to move in the direction of the mouse so that it feels to the user like he is moving the image around under the viewportThat means that, if the mouse is moved toward the top left, the viewport must appear to move toward the bottom right of the image, which is achieved by increasing the values of viewportX and viewportY Given this, the code in the updateViewport() function, most of which is concerned with making sure that the user is not allowed to drag the viewport outside of the image itself, should be easy to understand
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Obviously, this will have no effect on a mobile device because the mobile profile does not support changing the cursor
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Coordinates, Transforms, and Layout
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In the lastseen many of the types ofbeen introducedprovidedconcept of a scene graph, and few chapters, you have to the you have nodes that are by the JavaFX runtimeThe
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first part of this chapter is concerned with transforms, which enable you to move, resize, and rotate a nodeThis chapter examines and illustrates all the available transforms, with the exception of the perspective transform, which is discussed in 20, Effects and Blending Transforms cause the bounds (that is, the size/position) of a node to change In the second half of this chapter, we discuss coordinate systems and the various different bounds that are associated with a node The third part of this chapter discusses the support that JavaFX provides for automatic layout of nodesThe core of this support lies in the Container classVarious subclasses of Container implement different node layout algorithms, all of which are covered in this chapterWe defer discussion of custom layouts to 25, Building Custom Controls This chapter closes with two short sectionsThe first shows you how to use the knowledge of node layout that you will have acquired to improve the SnowStorm application that you saw in 4, A Simple JavaFX Application, so that it works properly with any screen sizeThe second deals with the application programming interface (API) that JavaFX provides to allow you to find out how many screens there are on the device on which your application is running, how large they are, and where they are logically placed relative to each other
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