cocoa - Resize NSImage in custom NSTextFieldCell -


i created drag , drop app using apple's example: https://developer.apple.com/library/mac/samplecode/sourceview/introduction/intro.html

i load actual image of dragged file.

when drag example enter image description here image file nsoutlineview, see resized in way:

enter image description here

i used without modifications apple's imageandtextcell class custom nstextfieldcell.

how can resize image fit proportionally cell rect?

works perfect.

@implementation nsimage (proportionalscaling)  - (nsimage*)imagebyscalingproportionallytosize:(nssize)targetsize {   nsimage* sourceimage = self;   nsimage* newimage = nil;    if ([sourceimage isvalid])   {     nssize imagesize = [sourceimage size];     float width  = imagesize.width;     float height = imagesize.height;      float targetwidth  = targetsize.width;     float targetheight = targetsize.height;      float scalefactor  = 0.0;     float scaledwidth  = targetwidth;     float scaledheight = targetheight;      nspoint thumbnailpoint = nszeropoint;      if ( nsequalsizes( imagesize, targetsize ) == no )     {        float widthfactor  = targetwidth / width;       float heightfactor = targetheight / height;        if ( widthfactor < heightfactor )         scalefactor = widthfactor;       else         scalefactor = heightfactor;        scaledwidth  = width  * scalefactor;       scaledheight = height * scalefactor;        if ( widthfactor < heightfactor )         thumbnailpoint.y = (targetheight - scaledheight) * 0.5;        else if ( widthfactor > heightfactor )         thumbnailpoint.x = (targetwidth - scaledwidth) * 0.5;     }      newimage = [[nsimage alloc] initwithsize:targetsize];      [newimage lockfocus];        nsrect thumbnailrect;       thumbnailrect.origin = thumbnailpoint;       thumbnailrect.size.width = scaledwidth;       thumbnailrect.size.height = scaledheight;        [sourceimage drawinrect: thumbnailrect                      fromrect: nszerorect                     operation: nscompositesourceover                      fraction: 1.0];      [newimage unlockfocus];    }    return [newimage autorelease]; }  @end

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