Request For Enhancement: Add method mouseIn() to JComponent

I would like to propose that a new method be added to JComponent. This method would return boolean true if the mouse is currently over the JComponent and false if not. Method signature: public boolean mouseIn().
This method would make it easier to accomplish visual feedback for when the mouse is over any JComponent, similar to how rollover can be done for AbstractButton.
Currently, the best method I can come up with is to add a MouseListener that records the state from the mouseEntered() and mouseExited() events. I add my own method mouseIn() that returns that state. Then method paintComponent() can check this state by calling mouseIn() and paint the component accordingly.
At first I thought the MouseListener should be added in each and every constructor of each and every JComponent, but then realized actually, the place to provide this feedback is in the ComponentUI class for each JComponent, as part of a custom Look & Feel. What I have come up with is to add the MouseListener to the JComponent in the ComponentUI's createUI() method, recording the state in the ComponentUI instance. The problem with this is, it makes it impossible for the ComponentUI to be a singleton like most of the ComponentUI classes are for the standard L&F's. This requires that each JComponent instance have its own ComponentUI instance.
If JComponent had this proposed mouseIn() method, the ComponentUI methods could simply call this method, and the ComponentUI would not have to record JComponent-instance-specific state. There would not be a need for so many instances of ComponentUI and MouseListener.

Hi,
imho this request for enhancement is much better than your other onces. In fact monitoring this state is more than just using mouseEntered(..) and mouseExited(...) - if there is a method, it must return a valid state - if mouse has entered and you make the component invisible, mouse does not exit before that takes place - if you open another application which covers this component, mouse does also not exit before, but the component stays visible - you see, there are much more things to control, to get a valid state at any time. And mouseIn() is an ugly name and says less - why not isMouseOver() or something like this?
Another thing is, why do you request this for JComponent?- Should java.awt.Component not get this feature in your opinion?
greetings Marsian

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I would like to propose an enhancement to Cell Renderers: add some way for Cell Renderers to know if the mouse is currently over the cell being renderered. Currently, Cell Renderers are told only if a cell is SELECTED or has FOCUS, which are not the same thing.
This would be of great help especially for JTable and JTableHeader, where one could provide visual feedback as the mouse moves across cells, which could be a great help for the visually impaired.

Hi, Marsian -
You are absolutely right about adding methods to interfaces. My mistake.
And you are also correct that what I propose would require that cells be repainted as the mouse enters or exits that cell's bounds. If this were to prove too expensive for some applications, the JComponents that use CellRenderers could have a property to enable or disable the behavior, for example setTrackMouseMovements(boolean). But when compared to what happens when you scroll a JTable, I cannot imagine this would be anywhere nearly as expensive, and the rendering that scrolling requires--all the cells that come into view within the viewport after scrolling--seems to work just fine.
Heck, even when you select a cell, a whole lot of cells are re-rendered. Also, when a tooltip is currently visible, if you move the mouse, the CellRenderer is consulted for each and every mouse movement, even within the same cell!!!. This seems to work fine too. Would re-rendering a cell as the mouse enters or exits its bounds by anywhere nearly as expensive?
But you write something that still confuses me. Are you saying that you create a new Component each and every time the getXXXRendererComponent() method of your CellRenderer is called? I don't understand why one would want to do this. Can you please help me out here?
I would think that only one instance of each Component sub-class that the CellRenderer might return would be more than good enough. And I would think that these instances would be created in the CellRenderer's constructor. Certainly, the default CellRenderer classes do not create a new Component each time a cell needs to be renderered. In fact, most of them actually extend an extension of JComponent themselves, i.e. JLabel, and return "this". No CellRenderer I have ever written has ever created a Component each time a cell is rendered. That would be very expensive.
But still, your point about altering interfaces is well taken. Too bad.
There must be some solution to this problem. JTable could provide the cell coordinates of the cell in which the mouse currently resides, for instance, or it could have a method that indicates if the mouse is currently over a cell with given coordinates.
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Good day!
In reply to a post I made (sore eyes), I recevied the following reply:
Re: sore eyes
Posted: Jun 30, 2006 1:01 PM in response to: mrmotoqvq in response to: mrmotoqvq
Click to reply to this thread Reply
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