Re: How to correctly control cursor???
Re: How to correctly control cursor???
- Subject: Re: How to correctly control cursor???
- From: Jiri Volejnik <email@hidden>
- Date: Sat, 6 Nov 2004 21:57:20 +0100
I don't see any way to get correct cursor behavior except to manage
setting
the cursor within my window controller. I have to keep some state info
about
which control is currently entered, so that on mouseEntered I know
whether
mouseExited has already been called and can account for the exit if
not, and
on mouseExited I know whether the exit was already taken into account
by
handling an earlier enter event. Is there a better way?
I'm successfully using the following simple techniqe for managing
graphical tools/selection cursors in my NSView subclass. I have no
problems with this solution.
I have the only one cursor rectangle for the view, and in every moment
it represents currently visible area of the view:
-(void)resetCursorRects
{
[self addCursorRect:[self visibleRect] cursor: mCursor]];
}
Whenever I need to change the cursor, I enforce calling this method by
calling invalidateCursorRectsForView:.
In fact, there are only two places in the code where I have to do it -
in mouseMoved: and in flagsChanged:
-(void)mouseMoved:(NSEvent*)e
{
// ...
[self updateCursor:e];
// ...
}
-(void)flagsChanged:(NSEvent*)e
{
// ...
[self updateCursor:e];
// ...
}
In this method I choose an appropriate cursor - I examine mouse
coordinates and key modifiers for this purpose. mCursor is a member
variable of the view:
-(void)updateCursor:(NSEvent*)e
{
mCursor = ...
[[self window] invalidateCursorRectsForView:self];
}
Unfortunately, the event delivered to flagsChanged: does not contain
mouse coordinates. As I need them to find out proper cursor, I cannot
simply pass the original event but I have to make a new one combining
data from the original event and from NSWindow's
mouseLocationOutsideOfEventStream: method. So my flagsChanged: looks
actually like this:
-(void)flagsChanged:(NSEvent*)e
{
NSEvent* f = [NSEvent keyEventWithType:[e type]
location:[[self window] mouseLocationOutsideOfEventStream]
modifierFlags:[e modifierFlags] timestamp:[e timestamp]
windowNumber:[e windowNumber] context:[e context]
characters:@"" charactersIgnoringModifiers:@""
isARepeat:NO keyCode:[e keyCode]];
[self updateCursor:f];
}
Last, but not least:
mouseMoved has not been called for me even when I have enabled it
somewhere as recommended. So I had to use a little workaround - to
subclass my window and to override senEvent. If you know better
solution, tell me, please:
-(void)sendEvent:(NSEvent*) event
{
[super sendEvent:event];
if (NSMouseMoved == [event type]) {
NSView* view = [[self contentView]
hitTest:[event locationInWindow]];
[view mouseMoved:event];
}
}
I hope it helps...
-- Jirka
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