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#21 chasearrows widget &element
chasearrows widget and element for aqua. bounds not set
correctly but is being investigated. This is a MUST on mac,
but I don't know if there is an API on Windows. Mozilla has
something similar, but with circles instead of thick short
lines. Perhaps I can do something similar.
Feel free to change names etc.
Mats
chasearrows
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Thanks for the patch -- I've been wanting to add something
like this.
Instead of a new widget, though, I was going to make it a
custom TProgressbar style -- even though it's not really a
"bar", from the program's point of view the interface is
identical to an autoincrement ttk::progressbar.
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Your choice but personally I think progressbar is a misleading
name.
Two questions:
1) Do you know of a Windows equivalent?
2) Do you want me to do one using generic Tk drawing.
This widget is a very useful interface element for application
developers so I'd like to see one for all platforms. It is typically
used to indicate for the user that a dialog is busy doing something
but that there is no available time estimate (like the progressbar).
The indeterminate progressbar is used differently. Spinning icons
etc. are used when the complete application is busy and is
expecting no user interaction, so that is different. Well, Firefox/
mozilla has one.
Mats
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See the tktable-tile-dev mailing list archives for February
2005 for more details on the design rationale for the
progressbar widget (in particular the post "Progress bars --
braindump"). But summarizing: the progress bar has three
main modes of operation, determinate, indeterminate, and
autoincrement; the "chasing arrows" UI idiom corresponds to
autoincrememt mode.
Agreed, [ttk::progressbar] isn't the best name but
[ttk::progress] was already in use.
Re: Windows equivalents -- from what I've seen, Windows apps
tend to use application-specific branded throbbers (like the
spinning IE logo) and operation-specific animations (like
the "folders flying into a trashcan" animation). For a
generic version, I think either the OSX style or Mozilla
style would be suitable.
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Attached patch tile-chasingarrows.patch implements this as a
custom progressbar style. Still OSX only; it should be
available as a common custom style in all themes.
Need to rethink the progressbar -phase autoincrement DWIM
logic; this isn't doing the right thing.
chasing arrows as custom style
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Something else to think about -- with this style of progress
indicator, the "-orient" and "-length" options aren't
relevant. Do these belong on the widget at all?
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They are options of the usual progressbar widget, but not to the
chasing arrows.
Just tried:
ttk::progressbar .p -style ChasingArrows
Layout Horizontal.ChasingArrows not found
Perhaps I am missing something.
I will try to write a similar widget using the generic tk drawing, but I
first have to track down a difficult bug in QuickTimeTcl.
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| ttk::progressbar .p -style ChasingArrows
| Layout Horizontal.ChasingArrows not found
Make sure you're getting the patched version of
library/aquaTheme.tcl, that's where the "ChasingArrows"
layout is defined. ("Horizontal.ChasingArrows" will use
that as a fallback.)
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Sorry, my fault. Old conflicting tile installation in ~/Library/Tcl.
Works ok with aquaTheme.c,v 1.27 but code disappeared in
aquaTheme.c,v 1.28 ?
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Seems I forgot to apply the patch. Did this "by hand". The problem
I see is that the width is 100, probably from the -length option. In
this case -length can be interpreted as the size of the *square* I
think. Perhaps this could be made style dependent somehow. Well,
this seems to be the "cost" for not using a separate widget for this.
The -mode is also 'determinate':
{-mode mode ProgressMode determinate determinate}
aquaTheme with additions
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Added new patch that is my aquaTheme.c using generic tk drawing
for the chasing arrows element. Only tested on mac. For a 16x16
widget it is not possible to make it good looking if not having
antialiasing. The best result is to have just 1x1 ovals. Increasing
the small radius slightly gives 2x2 ovals which are too big. So the
present code is the best I could achive with these circumstances.
Note that you have to go through the code, freeing colors and gc's
in
particular since I'm a novice here.
I have also written a drawing routine for WinXP using the GDI+
graphics library that has antialiasing. I picked their "flat interface"
to avoid any C++. I don't know how you feel about linking to gdiplus
lib, but you are anyway linking to native WinXP libs for drawing
elements. Completely untested! Not even built! I don't have cygwin
on my WIn2000, and WinXP I don't have at all.
All code I have added are enclosed in "EXPERIMENTAL"
comments, so you have to copy it to the correct places.
Mats
Chasing arrows type widget for WinXP
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New implementation for WinXP, chasearrowsXP.c. This one uses
the gdiplus lib to achive antialiasing. It looks pretty nice. It is not
identical to the aqua counterpart since it uses small ovals instead
of radial lines. However, it is written in C++ since GDI+ has C++
interfaces. There is a "flat interface" but I got compiler errors from
inside it, very weird.
Docs: http://msdn.microsoft.com/library/default.asp?url=/library/en-
us/gdicpp/GDIPlus/GDIPlus.asp
The background element wasn't drawn for some reason. I also had
to make a slight change in generic/widget.h, from:
struct WidgetSpec_
{
...
enum { WIDGET_SPEC_END } sentinel; /* to help the compiler
catch errors */
}
to:
typedef enum { WIDGET_SPEC_END } SentinelEnum; /* to help
the compiler catch errors */
struct WidgetSpec_
{
...
SentinelEnum sentinel; /* to help the compiler catch
errors */
}
since WIDGET_SPEC_END gets hidden inside the struct in C++
(scope issue).
Note: since this element is C++ it must go in a separate file.
Mats
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New code for drawing a different version of the chasing arrows
element using Tk generic drawing APIs. This one shows a rotating
bar. It is likely that it can be further improved by having a wider line
behind with a color blended between the foreground and the
background to achieve a smoother apperance.
Patch is ChasingArrowsElemBar.c
Mats
Draws a rotating bar. Generic Tk drawing.
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finished patch