On 18 Feb 2009, at 11:28 am, Walker Argendeli wrote:
You might remember how, in Xcode 2, the Build & Go button would
perform its action, but if you clicked it and held for a few
seconds, a menu would pop up with additional options.
I'm trying to have something like that. I have a drop down button
with its menu outlet connected to a custom menu with four items: the
first is empty, with an image in it so that will show up as the icon
for the toolbar. The other three are the other menu items. How
would I make it act like a regular button (no dropdown) if it's
clicked, but if it's held down for say, 2.5 seconds, the dropdown
comes down. Thanks for your help!
I had to do this recently. I couldn't find any built-in support for
this, I ended up having to write a custom NSButtonCell subclass. I
overrode -startTrackingAt:inView: to kick off a timer for showing the
menu, and popped up the menu in the timer callback. Getting the button
to highlight properly when the menu was released proved tricky - I
didn't solve that entirely satisfactorily, so if anyone can help out
there I'd be very grateful.
hth,
--Graham
- (void) setShowsMenuAfterDelay:(BOOL) showIt
{
mShowMenuAfterDelay = showIt;
}
- (BOOL) showsMenuAfterDelay
{
return mShowMenuAfterDelay;
}
- (BOOL) startTrackingAt:(NSPoint) startPoint inView:(NSView*)
controlView
{
// if there is a menu and show after delay is YES, start a timer for
showing the menu
if([self menu] && [self showsMenuAfterDelay] && mMenuTimer == nil)
{
mMenuTimer = [[NSTimer timerWithTimeInterval:1.0 target:self
selector:@selector(menuDelayCallback:) userInfo:nil repeats:NO]
retain];
[[NSRunLoop currentRunLoop] addTimer:mMenuTimer
forMode:NSEventTrackingRunLoopMode];
[[NSRunLoop currentRunLoop] addTimer:mMenuTimer
forMode:NSDefaultRunLoopMode];
mMouseDownPoint = [controlView convertPoint:startPoint
toView:nil];
}
return [super startTrackingAt:startPoint inView:controlView];
}
- (void) menuDelayCallback:(NSTimer*) timer
{
#pragma unused(timer)
// show the cell's menu
if([self isHighlighted])
{
// pop up the menu and switch tracking to it.
NSMenu* menu = [self menu];
NSEvent* event = [NSApp currentEvent];
[NSMenu popUpContextMenu:menu withEvent:event forView:[self
controlView]];
NSWindow* window = [[self controlView] window];
// on return, post a mouse-up so that the cell tracking completes as
normal. The mouse location
// is faked to be in the middle of the cell to make sure it gets
selected
NSEvent* fakeMouseUp = [NSEvent mouseEventWithType:NSLeftMouseUp
location:mMouseDownPoint
modifierFlags:0
timestamp:[NSDate
timeIntervalSinceReferenceDate]
windowNumber:[window
windowNumber]
context:[NSGraphicsContext currentContext]
eventNumber:0
clickCount:1
pressure:0.0];
[window postEvent:fakeMouseUp atStart:YES];
[(NSControl*)[self controlView] selectCell:self];
[self setState:NSOnState];
}
[mMenuTimer release];
mMenuTimer = nil;
}
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