Let me try again to clarify my lack of understanding.
(0) I created a new Document project.
All I did in IB Inspector pane was to make the window size 500, 500
and Center Horizontally and Vertically
(1) I added a sub-class of NSButtonCell with a class name of Class (it will be
used as the prototype cell)
(I understand about the convention of 3 char Class prefix but for this
project I don't need it)
All I did was add
[self setEnabled:YES];
[self setState:NSOffState];
to it's init method
(2) I added a sub-class of NSMatrix with a class name of Matrix.
I overrode - (void)drawRect:(NSRect)dirtyRect
and for now just added to it the statement [super drawRect:dirtyRect];
(3) In Document.h I added @property Matrix *theMatrix
In Document.m I added this code in method
- (void)windowControllerDidLoadNib:(NSWindowController *)aController {
[super windowControllerDidLoadNib:aController];
// Get the initial content view size so as to
// (a)compute where to place the matrix and
// (b)what size to make the matrix cells
// Local vars for this method
NSWindow *theWindow = [aController window];
NSView *theContentView = theWindow.contentView;
NSRect frame =[theContentView frame];
NSRect bounds = [theContentView bounds];
NSRect theContentFrame = theContentView.frame;
NSRect theMatrixFrame = NSInsetRect(theContentFrame, 40.0, 40.);
Cell * protoCell = [Cell new];
// Instance vars
_theMatrix = [[Matrix alloc]initWithFrame:theMatrixFrame
mode:NSListModeMatrix prototype:protoCell
numberOfRows:3 numberOfColumns:3];
[theContentView addSubview:_theMatrix];
}
(4) Running the code produces a window centred horizontally and vertically on
the screen, as desired,
but with the matrix drawn at the top left of the content view but with the
origin inset by 40.0, 40.0 from the top left.
Based on my reading of the docs I anticipated that it would be drawn at the
bottom left with the origin inset by 40.0, 40.0 from the bottom left.
Here are quotes from the View Programming Guide 2013-08-08
"By default, the graphics environment origin (0.0,0.0) is located in the lower
left,…." page 11
"The frame rectangle defines the view's location and size in the superview
using the superview’s coordinate system.
The bounds rectangle defines the interior coordinate system that is used when
drawing the contents of the view, including the origin and scaling." page 12
"The content view acts as the root of the visible view hierarchy in a window."
Page 17
(5) The values of the frame and bounds rects are as follows:
Document windowControllerDidLoadNib
Frame 0 ,0, 500, 500; Bounds 0, 0, 500, 500
Matrix drawRect:(NSRect)dirtyRect
Frame 40, 40, 420, 420; Bounds 0, 0, 40, 40
(6) So I must be missing something in my understanding of the documentation.
My thinking is that since the window's contentView is a View and it's graphics
environment origin is 0.0, 0.0 located in the lower left
the matrix should have been drawn with a lower left origin.
Why am I wrong?
(In pre-OS X days QuickDraw origin was top left based if I recall correctly).
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