contentsize and contentOffset equivalent in NSScroll view

Question

I am porting an app from Ipad to mac. (I know that it sounds weird)

I stuck with NSScrollview. Please guide me contentsize , contentOffset equivalent in NSScrollview.

Blackstock

Answer 1

UIScrollView* uiScroll;
uiScroll.contentSize;
uiScroll.contentOffset;
uiScroll.contentSize = CGSizeMake(w,h);
uiScroll.contentOffset = CGPointMake(x,y);

=

NSScrollView* nsScroll;
nsScroll.documentView.frame.size;
nsScroll.documentVisibleRect.origin;
nsScroll.documentView.frameSize = NSMakeSize(w,h);
[nsScroll.documentView scrollPoint:NSMakePoint(x,y)];

Or perhaps even better:

import AppKit

extension NSScrollView {
    var documentSize: NSSize {
        set { documentView?.setFrameSize(newValue) }
        get { documentView?.frame.size ?? NSSize.zero }
    }
    var documentOffset: NSPoint {
        set { documentView?.scroll(newValue) }
        get { documentVisibleRect.origin }
    }
}

Notes: I used 'documentSize' (and 'documentOffset') because 'contentSize' conflicts with an already existing property of NSScrollView.

Prismatoid

nsScroll.documentView.scrollPoint is not available. It shall be [nsScroll.documentView.scrollPoint NSMakePoint(x,y)] instead. – Turnheim

@HarryNg Thanks, I recently modernized the syntax and created that mistake. I've fixed it now. – Prismatoid

There's a subtle difference between the UIScrollView.contentOffset setter and NSView.scroll(_:): the latter makes the scrollers flash. If anyone finds out how to not make them flash, please advise. – Stupe

Answer 2

In addition to the lines from @aepryus, here are a couple more useful lines for getting/setting the scroll offset on macOS:

//Get the current scroll offset:
_contentViewOffset = scrollView.contentView.bounds.origin;

//Set the scroll offset from the retrieved point:
NSPoint scrollPoint = [scrollView.contentView convertPoint:_contentViewOffset toView:scrollView.documentView];
[scrollView.documentView scrollPoint:scrollPoint];

Valerivaleria

Answer 3

Everything you need to know about NSScrollView is laid out in the Scroll View Programming Guide for Cocoa provided in the documentation.

Although it doesn't appear that there's a direct equivalent, UIScrollView's contentSize can be likened to the size of NSScrollView's documentView, which is the scrollable content provided as an NSView to NSScrollView with setDocumentView:.

setContentOffset: can be compared to NSView's scrollPoint:, which uses an NSPoint to specify the offset of the documentView within the NSScrollView.

See the documentation for elaboration and code examples.

Harvin