RE:mouse clicking multiple cells-highlighting multiple cells

• To: Curtis Rueden <curtis@xxxxxxxxxxxxx>
• Subject: RE:mouse clicking multiple cells-highlighting multiple cells
• From: "Kam, Michelle C" <michelle.c.kam@xxxxxxxx>
• Date: Sat, 12 Jul 2003 16:18:39 -0700

Hi Curtis,

I'm implementing the feature for a user to click on multiple cells by
holding "control" on the keyboard and clicking with the mouse. I'm using
your advice about the FancySSCell.setSelected(boolean) method called
from within SpreadSheet.selectCell(). 

I tried adding a for loop within the double for loop of SS.selectCell()
that goes through my vector holding cell choices and sets their "select"
value to true and then calls setSelected(). So I kept the original code
in the double for loop except now I'm going through each cell in the
spreadsheet with *every* iteration of the outer double for loop. This is
inefficient since I'm iterating through the vector *every* time the user
clicks on a cell and then re-highlighting all the cells that have
already been highlighted up to the new cell that the user most recently
selected. 

I thought about maybe adding a simple 1 liner to my implementation of
the DisplayListener interface in displayChanged() such as:
displayCells[ci][cj].setHighlighted(true) 
but setHighlighted is declared private in FancySSCell, and I'm not even
sure that setHighlighted() would remember the cells that are already
highlighted with each mouse click.

Do you know of a way to avoid my triple for loop in SS.selectCell() and
not re-highlight the cells that have already been highlighted with each
successive mouse click? Is there a more efficient way of handling this
case instead of my inefficient approach right now which is: 

user clicks on cell #1,
highlight cell #1,
user clicks on cell #4, 
highlight cell #1 and #4
user clicks on cell #8,
hightlight cell #1, #4, and #8

Thanks,
Michelle


Michelle Kam           (408) 742-2881
Lockheed Martin Space Systems Co. SSM/ATC/MSIS
B/153 O/L922 
1111 Lockheed Martin Way, Sunnyvale, CA 94089




-----Original Message-----
From: Curtis Rueden [mailto:curtis@xxxxxxxxxxxxx]
Sent: Tuesday, July 01, 2003 2:53 PM
To: Kam, Michelle C
Subject: RE: mouse clicking multiple cells


Hi Michelle,

SpreadSheet's top-level selectCell(int, int) method calls
FancySSCell.setSelected(boolean). With a little bit of
digging into the visad.ss source code, or even scanning the
Javadocs, you can uncover things like this yourself.

-Curtis

At 03:53 PM 7/1/2003, you wrote:
>Hi Curtis,
>
>I added a Vector to SpreadSheet.java so that when a user clicks on a
cell,
>that cell # is stored in the vector at SpreadSheet.selectCell(). I also
>implemented DisplayListener.java with my class CellDisplayListener.java
that
>checks if the mouse was clicked and "control" was held down. In that
case,
>it calls selectCell() where it updates the vector of selected cells by
>adding this one. 
>
>The cell #'s seem to be added into the vector as I click on them, but
>multiple cells cannot be highlighted at once. ie. I'll click on a cell
and
>then release the mouse to click on another cell but then the first cell
is
>no longer highlighted. Only the most recently selected cell is
highlighted.
>Is there a way to disable the de-selection of cells once the user
clicks on
>another cell? Below is CellDisplayListener.java:

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