Auto-Resizing of NSTextView and/or NSScrollView

Question

I have an NSTextView inside an NSView (which is being used by a NSPopover, don't know if that is relevant) that I'm trying to resize automatically and programmatically (cf caption).

enter image description here

I have been struggling with a lot of stuff, namely :

Looking at NSLayoutManager and usedRectForTextContainer that give me aberrant size values (usedRectForTextContainer : {{0, 0}, {0.001, 28}})
Modifying NSScrollView frame, [NSScrollView contentView], [NSScrollView documentView]
Getting rid of AutoLayout

I reached the point where I can resize my scollview and my Popover, but I can't get the actual height of the text inside the NSTextView.

Any kind of help would be appreciated.

-(void)resize
{
    //Get clipView and scrollView
    NSClipView* clip = [popoverTextView superview];
    NSScrollView* scroll = [clip superview];

    //First, have an extra long contentSize and ScrollView to test everything else
    [popover setContentSize:NSMakeSize([popover contentSize].width, 200)];
    [scroll setFrame:(NSRect){
        [scroll frame].origin.x,[scroll frame].origin.y,
        [scroll frame].size.width,155
    }];



    NSLayoutManager* layout = [popoverTextView layoutManager];
    NSTextContainer* container = [popoverTextView textContainer];

    NSRect myRect = [layout usedRectForTextContainer:container]; //Broken
    //Now what ?

}

does this happen only the first time resize is called? i ask because usedRectForTextContainer: doesn't do any layout before it returns the rect. Is this in Mavericks? — lead_the_zeppelin, Nov 05 '13 at 13:49
Yes, it is on Mavericks, and no, it varies a lot (first time called, gives an OK result, and then it's height shrinks to 0.001). If you are on Github, the project is https://github.com/bertrand-caron/BCFirstLaunchTutorial if you want to try to fork it and play around with it. — Bertrand Caron, Nov 05 '13 at 13:59

score 4 · Accepted Answer · answered Nov 05 '13 at 08:58

4

I still have no idea why I can't use [layout usedRectForTextContainer:container], but I managed to get the NSTextView's height by using :

-(void)resize
{
    //Get glyph range for boundingRectForGlyphRange:
    NSRange range = [[myTextView layoutManager] glyphRangeForTextContainer:container];

    //Finally get the height
    float textViewHeight = [[myTextView layoutManager] boundingRectForGlyphRange:range
                                       inTextContainer:container].size.height;
}

answered Nov 05 '13 at 08:58

Bertrand Caron

2,525
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4

You can use `usedRectForTextContainer:`, it isn't broken. The problem is it doesn't layout the text, so you need to call `glyphRangeForTextContainer:` first, in order to layout the text. – harrisg Apr 07 '14 at 21:54

score 3 · Answer 2 · answered Sep 10 '16 at 17:19

Here is some functional code that I have tested myself for swift. usedRectForTextContainer is not broken it just is set lazily. To set it i call glyphrangefortextcontainer

I found the answer here: http://stpeterandpaul.ca/tiger/documentation/Cocoa/Conceptual/TextLayout/Tasks/StringHeight.html

    let textStorage = NSTextStorage(string: newValue as! String)
    let textContainer = NSTextContainer(size: NSSize(width: view!.Text.frame.width, height:CGFloat.max))
    let layoutManager = NSLayoutManager()

    layoutManager.addTextContainer(textContainer)
    textStorage.addLayoutManager(layoutManager)

    textContainer.lineFragmentPadding = 0.0
    textContainer.lineBreakMode = NSLineBreakMode.ByWordWrapping
    textStorage.font = NSFont(name: "Times-Roman", size: 12)

    layoutManager.glyphRangeForTextContainer(textContainer)

    let rect = layoutManager.usedRectForTextContainer(textContainer)

    Swift.print(rect)

The documentation also suggest that is the the case:

`text.layoutManager!.glyphRange(for: text.textContainer!)` didn't work for me; I ended up using `ensureLayout` instead as per http://stackoverflow.com/a/17373678/359640 — tjvr, Jan 19 '17 at 17:40

Auto-Resizing of NSTextView and/or NSScrollView

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