Objective-c – Handwired NSTextView clipping bug

cocoamacosobjective c

I'm trying to assemble a NSTextView by hand as in Apple's TextSizingExample and found a boring bug. If you run TextSizingExample and select "Wrapping Scrolling Text" mode, then you'll see the text being partially hidden by a vertical scrollbar. Tried to play with the size and autoresizing mask of text container and text view but it didn't help.

Best Answer

The problem is in the VerticalScrollAspect class's naive approach to creating the scroll view. In the -containerView method, there is the following line:

scrollView = [[NSScrollView alloc] initWithFrame:[documentView frame]];

Unfortunately, this does not account for the width of the vertical scroll bar or the border style of the scroll view, both of which are important to consider.

Related Solutions

Cocoa – Using Autolayout with expanding NSTextViews

I am working on a very similar setup — a vertical stack of views containing text views that expand to fit their text contents and use autolayout.

So far I have had to subclass NSTextView, which is does not feel clean, but works superbly in practice:

- (NSSize) intrinsicContentSize {
    NSTextContainer* textContainer = [self textContainer];
    NSLayoutManager* layoutManager = [self layoutManager];
    [layoutManager ensureLayoutForTextContainer: textContainer];
    return [layoutManager usedRectForTextContainer: textContainer].size;
}

- (void) didChangeText {
    [super didChangeText];
    [self invalidateIntrinsicContentSize];
}

The initial size of the text view when added with addSubview is, curiously, not the intrinsic size; I have not yet figured out how to issue the first invalidation (hooking viewDidMoveToSuperview does not help), but I'm sure I will figure it out eventually.

Best Answer

Related Solutions

Cocoa – Using Autolayout with expanding NSTextViews

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