RE: [gef-dev] Auto-expose and marquee tools

[Randy Hudson <hudsonr@xxxxxxxxxx>]

When the mouse goes outside of the viewer
on Motif or GTK (or maybe both), you get a mouse exit event and nothing
more.  That is one reason why we don't autoscroll outside of the viewer:
It wouldn't be consistent across platforms.  Another reason, is that
it wouldn't be consistent with drag and drop operations, which must be
inside the canvas.  The third reason is that "the platform"
(pronounced Windows Explorer) only autoscrolls when inside the canvas (probably
they are using native DND).

I'd like to check out the marquee tool
sometime but we are very busy with text editing for now.

-randy

"Gunnar Wagenknecht" <G.Wagenknecht@xxxxxxxxxxxx>
Sent by: gef-dev-admin@xxxxxxxxxxx

12/08/2004 12:22 AM

Please respond to
gef-dev

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Subject	RE: [gef-dev] Auto-expose and marquee tools

We need it in the viewer.
Currently we are using our own marquee tool which is mostly a lot of copy
and paste because some important methods are "private" :( That's
also because we changed it a little bit to use another figure when calculating
if an editpart should be included or not. Basically it works like the marquee
selection rectangle in Photoshop. I can start at the top left and select
everything in my editor even if something is not visible because it scrolls.
 
We don't use nested containers
and our root editpart is creating the marquee tool. It is also returning
a special expose helper that continues scrolling if the pointer is moved
outside the viewer. PLUS, I have modified the tools to perform auto-exposing
in handleDragInProgress instead of handleHover. We just feel that this
is more common in other applications (start exposing as soon as the pointer
is outside the viewer).

---

From: gef-dev-admin@xxxxxxxxxxx [mailto:gef-dev-admin@xxxxxxxxxxx]
On Behalf Of Randy Hudson
Sent: Tuesday, December 07, 2004 4:59 PM
To: gef-dev@xxxxxxxxxxx
Subject: Re: [gef-dev] Auto-expose and marquee tools


Doesn't the auto-expose stuff expose editparts?  For the marquee tool,
you would just want to expose the point where the lasso is currently dragged,
right?  If so, maybe there's not much intersection between the two.

Do you need marquee expose to work in nested scrollable containers, or
just the viewer itself? 

-Randy

"Gunnar Wagenknecht" <G.Wagenknecht@xxxxxxxxxxxx>
Sent by: gef-dev-admin@xxxxxxxxxxx

12/07/2004 12:06 AM

Please respond to
gef-dev

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Subject	[gef-dev] Auto-expose and marquee tools

Hi!

I'd like to add and contribute support for auto-expose on the marquee
tools. Currently I see three options.

1. Move auto-expose implementation from TargetingTool into AbstractTool.
2. Move auto-expose implementation from TargetingTool into a new
abstract class AutoexposeTool and inherit from this class.
3. Reimplement auto-expose in the marquee tools.

I don't want to go the 3rd way. What's the best way to go? The 2nd is
the more cleaner way. 

BTW, I also attached a new patch to
https://bugs.eclipse.org/bugs/show_bug.cgi?id=44288

This adds an additional contructor which allows clients to create a
ViewportAutoexposeHelper that continues scrolling if the pointer is
moved outside the viewport.

Cu, Gunnar
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