objective c - View-based NSTableView selection? -

i wrote view-based tableview, this:

and draw selection nstablerowview, code this:

- (void)drawrect:(nsrect)dirtyrect {   [[nscolor clearcolor] setfill];   if (self.isclicked) {     [[[nscolor blackcolor] colorwithalphacomponent:0.08] setfill];   }   nsrect rowviewrect = nsmakerect(0, 0, 274, 72);   nsbezierpath *path = [nsbezierpath bezierpathwithrect:rowviewrect];   [path fill]; } 

but finally, found tablerowview not on tableview, selectedcolor not cover image , button, more background color, need selected tablerowview cover view, this:

the selected color cover image , button. have googled, not found ideas. help~

so bit tricky. strategy have overlay colored view alpha less 1 in nstablecellview , add , remove based on cell's selection.

first, need nsview can set background color:

nsview_background.h

@interface nsview_background : nsview  @property (nonatomic, strong) nscolor *background; @end 

nsview_background.m

#import "nsview_background.h"  @implementation nsview_background  - (void)drawrect:(nsrect)dirtyrect {     [self.background set];     nsrectfill([self bounds]); }  - (void)setbackground:(nscolor *)color {     if ([_background isequal:color]) return;      _background = color;      [self setneedsdisplay:yes]; } @end 

second, in nstablecellview subclass, add nsview_background property:

#import "nsview_background.h"  @interface @property (nonatomic, strong) nsview_background *selectionview; @end 

third, add method nstablecellview subclass:

- (void)shouldshowselectionview:(bool)shouldshowselectionview {     if (shouldshowselectionview) {         self.selectionview = [[nsview_background alloc] init];         [self.selectionview setbackground:[nscolor graycolor]];         self.selectionview.alpha = 0.4;         [self addsubview:self.selectionview];          [self setneedsdisplay:yes];   // draws selection view     } else {         [self.selectionview removefromsuperview];         self.selectionview = nil;     } } 

fourth, add drawrect in nstablecellview subclass:

- (void)drawrect:(nsrect)dirtyrect {     if (self.selectionview)         self.selectionview.frame = self.bounds; } 

finally, override nstablecellview:setbackgroundstyle:

- (void)setbackgroundstyle:(nsbackgroundstyle)backgroundstyle {     switch (backgroundstyle) {         case: nsbackgroundstyledark:             [self shouldshowselectionview:yes];             break;         default:             [self shouldshowselectionview:no];             break;     } } 

i know seems hacky way behavior. hope helps , luck!