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Re: how to use MouseAdapter - update

Posted by Aryeh Weiss on Apr 18, 2021; 1:01pm
URL: http://imagej.273.s1.nabble.com/how-to-use-MouseAdapter-tp5024620p5024621.html

I found that the getModifiersEx() method works, and that if I press
shift it returns 64, and control returns 128. So now I have a way to
detect a pressed shift or control.  The new code is

class DliteMouseListener (MouseAdapter):

     def __init__ (self):
         self.xLoc = 0
         self.yLoc = 0
         self.mods = 0
     def mouseClicked (self, e):
         print 'In DliteMouseListener: e.getX() =', e.getX(), ',
e.getY() =', e.getY(), "mods = ", e.getModifiersEx()
         self.xLoc = e.getX()
         self.yLoc = e.getY()
         self.mods = e.getModifiersEx()
     def X(self):
         return self.xLoc
     def Y(self):
         return self.yLoc

and I run this to test it:

     while True:
#        wd = WaitForUserDialog("select "+classOfImage)
#        wd.show()
         newX = dML.X()
         newY = dML.Y()
         if dML.mods == 64:
             break
         elif xLoc != newX or yLoc != newY:
             xLoc = newX
             yLoc = newY
             print "top level: ",xLoc, yLoc

However, now the strange thing is that when I click my mouse, it does
thing twice, and if I hold shift, it breaks, but only after printing a
set of coordinates. Here is the output for three clicks and then a 4th
click while holding the shift key:

In DliteMouseListener: e.getX() = 922, e.getY() = 507, mods = 0
top level: 922 0
top level: 922 507
In DliteMouseListener: e.getX() = 622, e.getY() = 517, mods = 0
top level: 622 507
top level: 622 517
In DliteMouseListener: e.getX() = 1044, e.getY() = 875, mods = 0
top level: 1044 517
top level: 1044 875
In DliteMouseListener: e.getX() = 1148, e.getY() = 768, mods = 64
top level: 1148 875

For each call to the listener, it printed two points , because it ran
         elif xLoc != newX or yLoc != newY:
             xLoc = newX
             yLoc = newY
             print "top level: ",xLoc, yLoc
twice. Somehow ,  xLoc and yLoc changed even thought the mouse was not
clicked.
If I use the WaitfForUser dialog, it all works correctly. Even if I
click repeated on the WaitForUser prompt, it does not give me a second
point.

What have I done wrong?

--aryeh

--
Aryeh Weiss
Faculty of Engineering
Bar Ilan University
Ramat Gan 52900 Israel

Ph:  972-3-5317638
FAX: 972-3-7384051



On 18/04/2021 14:35, Aryeh Weiss wrote:

>
> I am try to do something interactive, and for this reason I need to
> learn ho wot use MouseAdapter.
>
> I began with  this, and it works fine.:
>
> from java.awt.event import MouseAdapter
>
> class DliteMouseListener (MouseAdapter):
>
>     def __init__ (self):
>         self.xLoc = 0
>         self.yLoc = 0
>     def mouseClicked (self, e):
>         print 'In DliteMouseListener: e.getX() =', e.getX(), ',
> e.getY() =', e.getY()
>         self.xLoc = e.getX()
>         self.yLoc = e.getY()
>
> and this calls it:
>
> dML = DliteMouseListener()
> ic = inputImp.getCanvas()
> ic.addMouseListener (dML)
>
> So far, it works fine.
>
> Now I want to be able to detect if the shift or control key is
> pressed, so I looked up MouseEvent, and found
> getMouseModifiersText(int modifiers), so I tried to use
>
> e.getMouseModifiersText("Shift") or e.getMouseModifiersText("Control")
> to check if the Shift or Control key is pressed during the event.
>
> I get the following error in the Fiji ConsoleAttributeError:
> 'java.awt.event.MouseEvent' object has no attribute 'getModifierStateText'
>
> I tried variations of this such as using MouseEvent.shiftKey , or
> MouseEvent.ctrlKey, and again these attributes do not exist.
>
> When I pretty-print the MouseEvent e, I see that it gives my the
> coordinates, the absolute coordinates, the button number, and the
> clickCount. (and indeed, e.button worked).
>
> At this point I realize that I do not understand something basic about
> how this works.
>
> Can I modify the dML class to do this, or am I completely off target
> and I need something completely different to do what I am trying to do?
>
> Thanks in advance for any assistance.
>
> --aryeh
>
> --
> Aryeh Weiss
> Faculty of Engineering
> Bar Ilan University
> Ramat Gan 52900 Israel
>
> Ph:  972-3-5317638
> FAX: 972-3-7384051
>


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