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    Default LiveGrid scrollbar disappears if scrollbar is too large in Firefox

    LiveGrid scrollbar disappears if scrollbar is too large in Firefox


    You can see it in the livegrid example http://www.sencha.com/examples/#livegrid
    If you increase the size of the scrollbar beyond 18 pixels, either by increasing the DPI/font settings or manually increasing the scrollbar size, it disappears in Firefox.

    Firefox will refuse to draw a scrollbar if the div is too narrow to fit it, and the livescroller div is given a fixed width of 18px from gxt-all.css.

    Removing/overriding this CSS rule will allow the scrollbars to show up, but there is still a lesser problem:
    the column widths don't line up with the scrollbar gutter.

    Investigating further, there seems to be 2 reasons for this:

    First, inside GridView, the scrollOffset field is set to a hardcoded 19 pixels, when it should really be Math.max(19, XDOM.getScrollBarWidth()) as seen in a few other places.

    Changing this alone does not completely fix the problem, because XDOM.getScrollBarWidth() is actually broken in Firefox and always returns 0 if the scrollbar size exceeds 25 pixels.

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    Also, the value '19' is hardcoded as the scrollbar size in a few other places,
    (line numbers are for GXT 2.2.3)
    GridView line 138 (mentioned above)
    LiveGridView line 375
    RowLayout lines 92, 189

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    We will look into this for GXT3. There are serveral more changes needed to make this completly work.

    I just did some fast testing for getScrollBarWidth and it works fine for me in FF.

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    Just retested and for me, getScrollBarWidth works in Firefox as long as the width is less than 26px.

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    For anyone interested, I have reached a satisfactory workaround by adding the following css:
    Code:
    .x-grid-panel .x-livegrid-scroller {
      width: auto;
      padding-left: 1px;
    }
    and overriding LiveGridView with
    Code:
    public LiveGridViewExtended() {
        super();
        scrollOffset = Math.max(19, XDOM.getScrollBarWidth());
    }

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    I had an outstanding commit that fixed this (including other things). I commited the scrollbar size calculation to SVN. I also removed the hardcoded size as you mentioned too.

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    Thank you for the speedy resolution, much appreciated.

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