Hi all,
I’m trying to get the accessory view of an NSAlert to layout similarity to the
the text fields of the messageText and informativeText. That is:
* Fill the the available horizontal space of the alert, respecting margins
* Including accounting for the different margins of the normal and wide
appearance
* Overflow any content of the accessory view by increasing its height
* Never contributing to increasing the width of the alert itself
But attempts at doing this with auto layout constraints have failed me, as
merely setting translatesAutoresizingMaskIntoConstraints = NO for my view to
set up constraints seems to break the margins that NSAlert applies to the
accessory view, and I don’t know how to restore them.
Looking at the disassembly of NSAlert
(_buildLayoutConstraintsForWideAppearance e.g.) it seems to use constraint
based layout, with the accessory view is wrapped inside another view
(accessoryContainer), but if I print out the constraints of the views in play
all I see are instances of NSAutoresizingMaskLayoutConstraint. And inspecting
the views in the hierarchy, they all respond YES to
translatesAutoresizingMaskIntoConstraints. Perhaps this is a red herring, but
shouldn’t I be seeing non-autoresizing constants here?
How would one expand the accessory view to fill its superview
(accessoryContainer), in a way that keeps the accessoryContainer’s position and
margins in both normal and wide apperance?
Here’s a reproducer of some of the things I’m seeing:
#import <Cocoa/Cocoa.h>
int main()
{
bool triggerWideApperance = true;
NSString *loremIpsum = @"Lorem ipsum dolor sit amet, consectetur adipiscing
elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
loremIpsum = [@"" stringByPaddingToLength:(triggerWideApperance ? 5 : 1) *
loremIpsum.length withString:loremIpsum startingAtIndex:0];
NSAlert *alert = [NSAlert new];
alert.messageText = loremIpsum;
alert.informativeText = loremIpsum;
// Attempt 1: Disables the wide alert apperance, making the alert super wide
alert.accessoryView = [NSTextField wrappingLabelWithString:loremIpsum];
// Attempt 2: Retains the wide alert apperance, but loses the left margin
of the accessory view,
alert.accessoryView = [NSStackView stackViewWithViews:@[
[NSTextField wrappingLabelWithString:loremIpsum]
]];
[alert layout];
[alert runModal];
}
Thanks for any tips or insights on this!
Cheers,
Tor Arne
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