this saves us some locking headaches and solves a possible deadlock in
ServerApp::Activate().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16688 a95241bf-73f2-0310-859d-f6bbb57e9c96
of the view currently under the mouse, or the application cursor, if the view doesn't
have its own cursor (ie. it will no longer set the wrong cursor in certain situations).
* AS_DELETE_CURSOR has no longer an influence on the application cursor, as this grabs
a ref for its own use - this fixes bug #275.
* AS_SET_CURSOR no longer sets the cursor when the application is not active.
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16678 a95241bf-73f2-0310-859d-f6bbb57e9c96
take an empty region as an indication to remove the clipping, but on R5,
this is actually valid... this patch fixes the problem
* the ViewState::clipping_region is now consistently used to memorize
the user defined clipping of the view state instead of being sometimes
used to cache the current view clipping
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16656 a95241bf-73f2-0310-859d-f6bbb57e9c96
free to continue (it would be nice to be notified before, though, in case
I get to it again in the next weeks).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16561 a95241bf-73f2-0310-859d-f6bbb57e9c96
windows to front (or minimize them).
* Desktop::ActivateWindow() no longer crashes in case the window to be activated
is not on the current workspace - instead, it doesn't do anything at this
point. IOW it doesn't handle workspace activation at all, yet.
* Renamed ServerWindow::GetWindowLayer() to ServerWindow::Window().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16550 a95241bf-73f2-0310-859d-f6bbb57e9c96
holding the window lock.
* Run() is now called before creating the window in the app_server when
Show() is called for the first time (which is now checked with fRunCalled
instead of some thread arithmetics).
* Minimize() now sends the show level of a window to the app_server, so that
it can actually determine if minimizing or maximizing the window should
have any effect. This fixes bug #225.
* fShowLevel's meaning is now reversed; when it's above zero, it now means
the window is shown (before, a level less than 1 meant shown). This definitely
better fits its name :)
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16536 a95241bf-73f2-0310-859d-f6bbb57e9c96
without a lock).
* Renamed private methods to start with the '_' symbol.
* Removed superfluous SetLayer[Font]State() and moved back those one-liners into their
AS_* handlers.
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* all cursors owned by a team are visually different,
or (iaw) an already existing cursor is reused when
it is set by the client again
* changed various occurances of cursor data from "int8*"
to "uint8*"
* ServerCursors also remember the R5 data from which
they were created
* the reference counting and destruction of
ServerCursors changed: The cursor knows it is attached
to a CursorManager and one can simply use
ServerCursor::Acquire() and Release() and the reference
counting and everything is being taken care of
* destroying a ViewLayer will now correctly release a set
ServerCursor
* fixed a race condition when setting a cursor through
BView::SetViewCursor(): If the client code looks like this:
BCursor cursor(cursorData);
someView->SetViewCursor(&cursor, false);
there is a relatively high chance the BCursor destructor
told the ServerApp thread to destroy the cursor before
the ServerWindow thread got to "acquire" the cursor for
use by the view layer. The very same problem is likely the
reason that SetViewCursor works to unreliably on R5, even
when the "sync" flag is set to "true" (although it should
theoretically work in that case).
all these fixes make WonderBrush work fine again with the
new support of custom cursors.... coded by axeld and myself
(the joys of pair programming :-)
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16521 a95241bf-73f2-0310-859d-f6bbb57e9c96
all those error output from the app_server.
* AS_LAYER_DELETE now gets a token, no longer frightening choice of parent.
* Removed locking in RemoveChild(); it has to be called locked now.
* Removed AS_LAYER_DELETE_ROOT as it's no longer needed.
* Removed support from BView for being PR3 compatible.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16424 a95241bf-73f2-0310-859d-f6bbb57e9c96
used by the Deskbar (for "Hide All" and "Show All"). The latter doesn't work
correctly yet, though, it just maximizes all windows of that application.
* Added a TODO to ServerWindow AS_MINIMIZE_WINDOW on how to make it work correctly.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16315 a95241bf-73f2-0310-859d-f6bbb57e9c96
got lost, before.
It might not work 100% correctly yet, but it works good enough to hide the Tracker
status window from the Deskbar, and thus, fixing bug #133.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16314 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Fixed a myriad of bugs all over the place, ranging from locking errors to
deleting objects that don't belong to the one deleting them (hello HWInterface!)
* Almost all ServerWindow cursor stuff was broken; I've replaced all commands
to set a cursor with a single one AS_SET_CURSOR.
* Renamed some cursor commands.
* Changed the (broken) way ServerApp::fAppCursor was maintained - the application
cursor is now NULL as long as possible.
* Removed superfluous ServerCursor app signature stuff.
* The BApplication will no longer duplicate the default/I-beam cursors, it will
just reuse the default ones which now have fixed tokens.
* As a result, changing the cursor is now working as expected, closing bug #102.
* Rewrote Cursor.h, renamed private members to match our style guide.
* Minor cleanup.
What's still left to be done is reference counting the cursor objects to make them
work right and reliable.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16237 a95241bf-73f2-0310-859d-f6bbb57e9c96
work though, as HWInterface can only draw B_RGB32 cursors...
* More build fixes for libbe_test target - it defines __HAIKU__ as well, now
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16211 a95241bf-73f2-0310-859d-f6bbb57e9c96
* fixed weird pointer conversion in SetStyle()
* fixed a potential mix up in operator=() in case the
other ServerFont has fStyle == NULL
ServerWindow:
* the WindowLayer fTopLayer cannot be deleted by
client request, just for safety reasons
* the link is flushed if there is no drawing engine,
but this case is theoretical only
* deleting the ServerWindow object syncs with the
client, so that when BBitmaps are deleted, they
can be sure there are no pending messages (which
would be executed in a nother thread)
* there is no timeout anymore when sending messages
to the client, which made absolutely no sense
AGGTextRenderer:
* renamed fFontManager to fFontCache, because that's
what it really is
* fLastFamilyAndStyle defaulted to the system plain
font and therefor that font was never loaded when
the font never changed meanwhile
DrawingMode:
* I'm not quite sure but I think there was the
potential of a division by zero, at least I
had crashes with "divide error"
HWInterface:
* fix update when the cursor shape changed in
double buffered mode
ViewLayer:
* since the top layer is never really deleted
before its time has come, it is not necessary
to set it to NULL in the ViewLayer destructor
ViewLayer/WindowLayer:
* added a function to collect the view tokens
that are affected by an update session
EventDispatcher:
* use the importance of the message for the timeout
in _SendMessage()
* drop mouse moved events in the server if we're
lagging behind more than 5 ms (Axel, maybe review)
View:
* there were some problems with the locking
of the BWindow looper in RemoveSelf(), since
this is called from the window destructor,
also of BWindows from BBitmaps, which have
never been run (this might need review), at
least I seem to have solved the crashing
problems introduced by actually deleting the
view hirarchy in the BWindow destructor
* fixed _Draw() for being used non-recursively,
temporarily disabled DrawAfterChildren, which
didn't work yet anyways (because views cannot
draw over children in the server yet)
Window:
* small cleanup when deleting shortcuts
* sync with the server when having send
AS_DELETE_WINDOW (see ServerWindow above)
* fixed locking in Begin/EndViewTransaction()
* removed folding of _UPDATE_ messages, since
there is only one ever in the queue
* set the fInTransaction flag during an update,
I plan to use this in BView later to
flush the link when drawing outside of an
update
* BView::_Draw() is now called by view token,
this gives the next leap forward in speed,
the overhead because of drawing clean views
was considerable
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15878 a95241bf-73f2-0310-859d-f6bbb57e9c96
or even the resizing mode isn't done yet, though. See TODOs.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15720 a95241bf-73f2-0310-859d-f6bbb57e9c96
and ResizeBy()
* WindowLayer::SetSizeLimits() needs to be called with the
AllWindows lock held
* I was observing weird behaviour with "unclickable" windows
that I might have fixed by explicitly excluding invisible
windows from Desktop::WindowAt(), there might be something
wrong with the "current" window list though, Axel would know
* finally found the problem with "delayed background clearing"
* enabled delayed background clearing and removed unnecessary
code. It should be more efficient, since it clears larger
areas at once, and it solves the problem of views unable to
draw into regions that are pending for another update - among
other things, updates in resizing windows are more fluent,
especially for B_FULL_UPDATE_ON_RESIZE views. "Cut off" scroll
bars should no longer appear when the view being scrolled takes
too long to redraw.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15714 a95241bf-73f2-0310-859d-f6bbb57e9c96
the AS_REDRAW message.
The AS_REDRAW message is now only used as a notifier - it's arrival is not
critical anymore, IOW it's simply dropped when the queue is full.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15511 a95241bf-73f2-0310-859d-f6bbb57e9c96
It also fixed a bug in the old code - the handshake semaphores were created
acquirable, causing the BDirectWindow::DirectDaemonFunc() to call DirectConnected()
with an uninitialized buffer and way too early - this probably didn't show up
before since it called it before the BDirectWindow constructor ran through,
so that DirectConnected() would still point to the BDirectWindow version, and
not to the implemented one of its subclass...
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15505 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Desktop::SetWindowFeel() is now working, but doesn't respect the window
position yet (ie. floating windows would have to be moved to front).
* WindowLayer::Workspaces() now always reflects exactly the lists it's in
(at least after Desktop::AddWindow() has been called). WindowList::AddWindow()
and RemoveWindow() now update this flag to be correct at all times.
* Fixed Desktop::_ChangeWindowWorkspaces() to not set the current workspace
for windows that are not on the current workspace, and vice versa.
It also would hide windows that were already hidden, and tried to show
windows that actually were hidden (did no other harm than triggering
a rebuild of the global clipping).
* Floating windows now work as expected.
* Desktop::SetFocusWindow() won't give a window focus that has a modal.
* Renamed OnWorkspace() to InWorkspace().
* ServerApp::InWorkspace() now works correctly, added ServerApp::Workspaces()
as well.
* WindowLayer::SubsetWorkspaces() returns the workspaces mask this modal or
floating window should be in.
* New window flag B_SAME_POSITION_IN_ALL_WORKSPACES should work as well.
* Floating and modal windows now have always set this flag.
* Added a WindowList::HasWindow() method.
* Desktop windows (windows with the desktop feel) can now have focus again
(I accidently broke that before).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15434 a95241bf-73f2-0310-859d-f6bbb57e9c96
is known by the server, anyway.
* B_MODAL_SUBSET_WINDOW_FEEL now also works as expected.
* Renamed AS_REM_FROM_SUBSET to AS_REMOVE_FROM_SUBSET.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15285 a95241bf-73f2-0310-859d-f6bbb57e9c96
* also followed Michael's suggestion (more or less) and moved the
look/feel/flags checks into separate methods.
* on construction, invalid look/feel/flags values are now corrected.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15269 a95241bf-73f2-0310-859d-f6bbb57e9c96
has to be udpated anyway.
* some work towards being able to set a window's look/feel/flags on-the-fly.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15265 a95241bf-73f2-0310-859d-f6bbb57e9c96
* look/feel are now window_look/window_feel instead of int32.
* removed the level stuff, I don't think this is needed.
* some other minor stuff.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15261 a95241bf-73f2-0310-859d-f6bbb57e9c96
This also allows the workspaces layer for these actions, which is now done as well.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15258 a95241bf-73f2-0310-859d-f6bbb57e9c96
just another case of troublesome generic RootLayer locking in ServerWindow
(I'm looking forward to get rid of this).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15249 a95241bf-73f2-0310-859d-f6bbb57e9c96
show any windows, but everything else seems to work fine.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15241 a95241bf-73f2-0310-859d-f6bbb57e9c96
directly under the mouse cursor.
* Added Desktop::ShowWindow() and HideWindow().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15238 a95241bf-73f2-0310-859d-f6bbb57e9c96
* didn't realize that mouse events always go to the view under the mouse, not
only if its the focus window (FFM can really do harm, after all :-)).
* removed a TODO from the list: EventDispatcher::Target is now a public
class EventTarget, and every ServerWindow has one.
* as a result, EventDispatcher no longer manages targets itself, it
just maintains a list of them. You no longer set messengers, you
only set targets.
* customization of the message filters, they no longer inherit from
BMessageFilter (but EventFilter).
* a message target is no longer set explicetly anywhere, it's only
changed in the message filters if needed.
* therefore, no more locking mess in the EventDispatcher needed.
* this also made the EventDispatcher::fLastFocus stuff superfluous.
* moved the RootLayer::MouseEventHandler() into the message filter.
* Replaced RootLayer::_ChildAt() with WindowAt().
* WindowLayer now has an idea if it has focus or not, it no longer needs
to query the RootLayer for this - maybe we should rename "focus" to
"active", though (as far as layers are concerned).
* the "_view_token" data is now added from the EventDispatcher, not
the (Window)Layer class anymore.
* removed Layer::MouseWheelChanged() as we currently don't need it
(if the need arises, we can add it back later again)
* there is still no mouse moved message sent when opening a window
under the cursor, though...
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15228 a95241bf-73f2-0310-859d-f6bbb57e9c96
* workspace switch and subset windows functionality temporarily removed
(away with that mess!).
* no more RevealWMState() - we now have methods like ActivateWindow()
and SendWindowBehind() that do all the work - just a little cleaner
and with less overhead.
* Workspace is now a pretty passive class - it only stores configurations
of the windows and screens.
* added an evil work-around for a locking problem (in RootLayer::_SetFocus()).
* I'll plan to move pretty much all of the remaining root layer functionality
to Desktop - so that the all regions lock is only held in case clipping
regions are affected.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15207 a95241bf-73f2-0310-859d-f6bbb57e9c96
processing (enabled when PROFILE_MESSAGE_LOOP is defined).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15150 a95241bf-73f2-0310-859d-f6bbb57e9c96
ServerApp now waits up to 3 seconds for windows before killing them - it now
waits on the death semaphore, and only kills a window if it didn't quit fast
enough.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15147 a95241bf-73f2-0310-859d-f6bbb57e9c96
Layer no longer knows anything about its subclass WindowLayer.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15131 a95241bf-73f2-0310-859d-f6bbb57e9c96
client's token space.
* finding layers by token is now O(1) instead of O(n) (as they are looked
up in the token space).
* removed Layer::FindView() as it's no longer needed (or should be used).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15113 a95241bf-73f2-0310-859d-f6bbb57e9c96
* RootLayer's mouse event processing is now at its minimum - the
EventDispatcher handles them now. As a result, a window will now
get only one message per event.
* RootLayer adds "_view_token" to mouse moved messages that specify
the view currently under the cursor.
* There is now a mouse event layer in RootLayer that gets preferred
when it's set - this is now used for the window moving instead of
the previous mechanism.
* changed the previous DistributeMessage() to an UnpackMessage()
method following Adi's suggestion.
* caveat: some things might be functionally broken in RootLayer now
because of removing the mouse notification stuff.
* "be:transit" handling is now done completely client side by
BWindow::_SanitizeMessage(() (similar to what the input_server does).
This should also make the mechanism pretty robust, since every
B_MOUSE_MOVED message can now trigger the view transit (in case a
message is lost). B_WINDOW_ACTIVATED messages should be generated
client side as well.
* renamed AS_LAYER_GET_MOUSE_COORDS to AS_GET_MOUSE as it's not a
layer specific command, and also gets the mouse buttons.
* B_MOUSE_* messages from the up server now contain only a "screen_where"
field; "where" (in window's coordinates) and "be:view_where" are
added in BMessage::_SanitizeMessage().
* messages that don't have a valid target in the looper are now
dropped instead of being sent to the looper - this should be done
in BLooper as well, though.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15087 a95241bf-73f2-0310-859d-f6bbb57e9c96
task_looper() again.
* removed BMessenger::fPreferred - whenever you had to specify "usePreferred" separately,
you don't have to do that anymore - use B_PREFERRED_TOKEN instead.
* fixed BTokenSpace::GetToken() semantics: it will no longer touch the "object" argument
in case of failure.
* Introduced a BWindow::_DistributeMessage() that will be part of the event dispatcher
counterpart to the app_server (the other will be _DetermineTarget()).
* Made it easier to use Michael's Message4 implementation: just add the following line
to your UserBuildConfig:
AppendToConfigVar DEFINES : HAIKU_TOP src : USING_MESSAGE4 : global ;
* Introduced ServerWindow::HandlerMessenger() and FocusMessenger() - the first will
target the client handler, while the other will target the preferred handler of the
client looper (usually the view having focus).
* Fixed dano message unflattening in the Message4 code.
* Changed BMessage::PrintToStream() to no longer use macros in the Message4 implementation.
* I hope that's all - it's a huge change, but it's all connected.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15046 a95241bf-73f2-0310-859d-f6bbb57e9c96
update the options in case the specified eventMask was zero.
* Added missing EventDispatcher::RemoveTemporaryTarget().
* Layers setting their event mask are now added to the EventDispatcher.
* The RootLayer is no longer contacted for SetEventMask() - it still handles
SetMouseEventMask(), tough - as a result, SetEventMask() temporarily doesn't
work anymore.
* Added Layer::ViewToken() method.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15023 a95241bf-73f2-0310-859d-f6bbb57e9c96
into a Desktop keyboard filter.
* Removed keyboard handling code from RootLayer and Layer.
* Renamed Desktop::ActiveRootLayer() to RootLayer() as there is only one
root layer per desktop.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15018 a95241bf-73f2-0310-859d-f6bbb57e9c96
work yet, though, as the dispatcher is not yet notified about those.
* no more mouse cursor jumping - the cursor will now start in the middle of the screen;
this should be part of the initial input_server handshake, though.
* ServerWindow can now return a BMessenger of its client window.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15017 a95241bf-73f2-0310-859d-f6bbb57e9c96
have different token spaces depending on the scope of its objects.
* removed TokenHandler - we're now using BTokenSpace instead.
* removed unused IPoint.cpp - if we ever need it again, it can still easily be
resurrected from the dead.
* some cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14925 a95241bf-73f2-0310-859d-f6bbb57e9c96
* the Layer destructor now deletes all of the layer's children
* WinBorder no longer has to delete its top layer, as it's also its child.
* minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14919 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Introduced and implemented AS_GET_SCREEN_ID_FROM_WINDOW - it only returns B_MAIN_SCREEN_ID,
though.
* renamed ServerWindow::fHandlerToken to fClientToken.
* The BScreen(BWindow *) constructor now really asks the server for the screen ID.
* ServerApp::fWindowList is now a BObjectList.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14910 a95241bf-73f2-0310-859d-f6bbb57e9c96
categories:
* Missing includes (like <stdlib.h> and <string.h>).
* Linking against $(TARGET_LIBSTDC++) instead of libstdc++.r4.so.
* Local variables shadowing parameters.
* Default parameters in function definitions (as opposed to function
declarations).
* All C++ stuff (nothrow, map, set, vector, min, max,...) must be imported
explicitly from the std:: namespace now.
* "new (sometype)[...]" must read "new sometype[...]", even if sometype is
something like "const char *".
* __FUNCTION__ is no longer a string literal (but a string expression), i.e.
'printf(__FUNCTION__ ": ...\n")' is invalid code.
* A type cast results in a non-lvalue. E.g. "(char *)buffer += bytes"
is an invalid expression.
* "friend class SomeClass" only works when SomeClass is known before.
Otherwise the an inner class with that name is considered as friend.
gcc 4 is much pickier about scopes.
* gcc 4 is generally stricter with respect to type conversions in C.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14878 a95241bf-73f2-0310-859d-f6bbb57e9c96
Right now, only the updates are disabled as a start. I am not sure what else
we can do here, but there probably is something :-)
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14855 a95241bf-73f2-0310-859d-f6bbb57e9c96
that's probably not wanted, as a window without a title is perfectly okay.
* AS_CREATE_WINDOW will now return a proper error code on failure.
* The title read from the link is no longer adopted by the ServerWindow constructor,
but copied - while the previous version was a bit faster, this is a lot cleaner.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14851 a95241bf-73f2-0310-859d-f6bbb57e9c96
handling client defined clipping. The client clipping stays in local coords,
which greatly simplyfies things. We ought to find a way to reduce the number
of regions needed per Layer. I just added another one...
* renamed a few "lay"s to "child".
* used the new client added clipping in ServerWindow
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14847 a95241bf-73f2-0310-859d-f6bbb57e9c96
* removed old Convert{To|From}{Parent|Top} methods. They were replaced by
Convert{To|From}{Parent|Screen}(type *data)
* removed some unused methods from Layer class.
* re-aranged Layer's class declaration - grouped methods
* made all Layer's members private.
* renamed a few private methods from method_name _MethodName
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14778 a95241bf-73f2-0310-859d-f6bbb57e9c96
use the origin from the previous state as a start
* this fixes scrolling again (minus redrawing too much stuff,
this is left for Adi :-)
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14770 a95241bf-73f2-0310-859d-f6bbb57e9c96
redrawn/invalidated now, with a single exception which I am working
on(when changing the front window the whole window area is invalidated
not just the region that became visible). The old Clipping code is broken
now. I will remove it in the next days.
Actual changes:
* removed Layer::GetWantedRegion() - was badly implemented.
* made Layer::_GetWantedRegion public and renamed it to: you guessed! :-)
* introduced Layer::MarkForRebuild(), TriggerRebuild(). You want to
calculate the new clipping regions, mark an area and then call
TRiggerRebuild() which will rebuild the visible regions for the current
Layer and all its descendants.
* for a Layer to redraw some parts of it, use
RootLayer::MarkForRedraw() to mark a region and then
RootLayer::TriggerRedraw() to see the changes (or send _UPDATE_ message in
case of a WinBorder).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14719 a95241bf-73f2-0310-859d-f6bbb57e9c96
