On 17 Jan 2010, at 16:30, Brad Stone wrote:
> Here's why I need this - I've been trying to solve this problem for 2 weeks!
>
> This issue all revolves around a NSCollectionView. Each CollectionViewItem
> has a view containing a NSTextField, NSDatePicker, NSButton (checkbox), and
> an NSLevelIndicator. The selection index of my CollectionView is binded to
> the selection index of an NSArrayController. The problem I having is if the
> user performs a mouseDown in the TextField I need to update the
> selectionIndex of the array controller so the CollectionView will show the
> appropriate view as selected. Without this, the wrong view is selected.
> Here's a quick example:
>
> 1) click the add button twice to create two items in my collectionView.
> Items with index 0 and 1. Since item 1 was the last one created, it is
> selected (I have it showing a grey box).
> 2) click your mouse into the text field of the item at index 0 and start
> typing
>
> The user would expect item 0 to be the selected item but it's not. The array
> controller still thinks item 1 is selected. It needs to be told otherwise.
> If the user pressed the remove button item 1 would be removed.
>
> This is why I want to fire an action when the user inserts into the text
> field (just like I do when the user clicks the checkbox). I want to change
> the selectedObject in the array controller. The problem I'm having with
> subclassing the NSTextField is I can't figure out how to get the
> CollectionViewItem from the subclassed TextField.
Does -superview not do the trick?
Sometimes when I need to activate views on mouse clicks I use the following
approach.
Subclass NSWindow and register the views I need click detection in with
NSWindow - addClickView:
In NSWindow -sendEvent: I check to see if we have a hit and dispatch a message
on the view
Might help you out.
@interface MGSClickWindow : NSWindow {
NSHashTable *_clickViews;
}
- (void)addClickView:(NSView *)aView;
@end
@implementation MGSClickWindow
/*
NSWindow designated initialiser
*/
- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)windowStyle
backing:(NSBackingStoreType)bufferingType defer:(BOOL)deferCreation
{
if ((self = [super initWithContentRect:contentRect
styleMask:windowStyle backing:bufferingType defer:deferCreation])) {
_clickViews = [NSHashTable hashTableWithWeakObjects];
}
return self;
}
/*
add a click view
click view must be a sub view of the NSWindow contentView
*/
- (void)addClickView:(NSView *)aView
{
if ([aView isDescendantOf:[self contentView]] && [aView
respondsToSelector:@selector(subviewClicked:)]) {
// _clickViews will maintain a weak ref to aView so we don't
need
// to remove it
[_clickViews addObject:aView];
}
}
/*
send event
This action method dispatches mouse and keyboard events sent to the window by
the NSApplication object.
*/
- (void)sendEvent:(NSEvent *)event
{
// look for mouse down
if ([event type] == NSLeftMouseDown) {
// look for deepest subview
NSView *deepView = [[self contentView] hitTest:[event
locationInWindow]];
if (deepView) {
for (NSView *aClickView in [_clickViews allObjects]) {
if ([deepView isDescendantOf:aClickView]) {
[(id)aClickView
subviewClicked:deepView];
break;
}
}
}
}
[super sendEvent:event];
}
@end
> If I could I could then execute my method to update the ArrayController. I
> tried creating an IBOutlet to the CollectionView, the ArrayController and the
> CollectionViewItem but they all come back as nil. I think I read here that
> IBOutlets don't work in this instance. I also tried setting up my own
> Notification but the CollectionViewItem never receives it (other objects do).
>
> This is tricky, any help you may have would be appreciated.
>
> Brad
>
>
>
> On Jan 17, 2010, at 6:12 AM, Graham Cox wrote:
>
>>
>> On 17/01/2010, at 3:56 PM, Brad Stone wrote:
>>
>>> I was able to capture the mouseDown event in the field but only in a
>>> subclass which is causing me problems elsewhere.
>>
>>
>> Indeed, a mouse click is not the only reason a field might become focused -
>> the user could tab into it as well.
>>
>> Overriding -becomeFirstResponder should do it.
>>
>> Taking a step back though, WHY do you need to get notified here? What are
>> you trying to do? There might be a better way.
>>
>> --Graham
>>
>>
>>
>>
>
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