libui/newcontrol_darwin.m

// 7 april 2015
#include "uipriv_darwin.h"

typedef struct singleView singleView;

struct singleView {
	NSView *view;
	NSScrollView *scrollView;
	NSView *immediate;		// the control that is added to the parent container; either view or scrollView
	uintptr_t parent;
	BOOL userHid;
	BOOL containerHid;
	BOOL userDisabled;
	BOOL containerDisabled;
};

static void singleDestroy(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	[destroyedControlsView addSubview:s->immediate];
}

static uintptr_t singleHandle(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	return (uintptr_t) (s->view);
}

static void singleSetParent(uiControl *c, uintptr_t parent)
{
	singleView *s = (singleView *) (c->internal);
	NSView *parentView;

	s->parent = parent;
	parentView = (NSView *) (s->parent);
	[parentView addSubview:s->immediate];
	updateParent(s->parent);
}

static void singleRemoveParent(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);
	uintptr_t oldparent;

	oldparent = s->parent;
	s->parent = 0;
	[s->immediate removeFromSuperview];
	updateParent(oldparent);
}

// also good for NSBox and NSProgressIndicator
static void singlePreferredSize(uiControl *c, uiSizing *d, intmax_t *width, intmax_t *height)
{
	singleView *s = (singleView *) (c->internal);
	NSControl *control;
	NSRect r;

	control = (NSControl *) (s->view);
	[control sizeToFit];
	// use alignmentRect here instead of frame because we'll be resizing based on that
	r = [control alignmentRectForFrame:[control frame]];
	*width = (intmax_t) r.size.width;
	*height = (intmax_t) r.size.height;
}

static void singleResize(uiControl *c, intmax_t x, intmax_t y, intmax_t width, intmax_t height, uiSizing *d)
{
	singleView *s = (singleView *) (c->internal);
	NSRect frame;

	frame.origin.x = x;
	// mac os x coordinate system has (0,0) in the lower-left
	frame.origin.y = ([[s->immediate superview] bounds].size.height - height) - y;
	frame.size.width = width;
	frame.size.height = height;
	frame = [s->immediate frameForAlignmentRect:frame];
	[s->immediate setFrame:frame];
}

static int singleVisible(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	if (s->userHid)
		return 0;
	return 1;
}

static void singleShow(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->userHid = NO;
	if (!s->containerHid) {
		[s->immediate setHidden:NO];
		updateParent(s->parent);
	}
}

static void singleHide(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->userHid = YES;
	[s->immediate setHidden:YES];
	updateParent(s->parent);
}

static void singleContainerShow(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->containerHid = NO;
	if (!s->userHid) {
		[s->immediate setHidden:NO];
		updateParent(s->parent);
	}
}

static void singleContainerHide(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->containerHid = YES;
	[s->immediate setHidden:YES];
	updateParent(s->parent);
}

static void enable(singleView *s)
{
	if ([s->view respondsToSelector:@selector(setEnabled:)])
		[((NSControl *) (s->view)) setEnabled:YES];
}

static void disable(singleView *s)
{
	if ([s->view respondsToSelector:@selector(setEnabled:)])
		[((NSControl *) (s->view)) setEnabled:NO];
}

static void singleEnable(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->userDisabled = NO;
	if (!s->containerDisabled)
		enable(s);
}

static void singleDisable(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->userDisabled = YES;
	disable(s);
}

static void singleContainerEnable(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->containerDisabled = NO;
	if (!s->userDisabled)
		enable(s);
}

static void singleContainerDisable(uiControl *c)
{
	singleView *s = (singleView *) (c->internal);

	s->containerDisabled = YES;
	disable(s);
}

uiControl *uiDarwinNewControl(Class class, BOOL inScrollView, BOOL scrollViewHasBorder)
{
	uiControl *c;
	singleView *s;

	s = uiNew(singleView);
	// thanks to autoxr and arwyn in irc.freenode.net/#macdev
	s->view = (NSView *) [[class alloc] initWithFrame:NSZeroRect];
	s->immediate = s->view;

	if (inScrollView) {
		s->scrollView = [[NSScrollView alloc] initWithFrame:NSZeroRect];
		[s->scrollView setDocumentView:s->view];
		[s->scrollView setHasHorizontalScroller:YES];
		[s->scrollView setHasVerticalScroller:YES];
		[s->scrollView setAutohidesScrollers:YES];
		if (scrollViewHasBorder)
			[s->scrollView setBorderType:NSBezelBorder];
		else
			[s->scrollView setBorderType:NSNoBorder];
		s->immediate = (NSView *) (s->scrollView);
	}

	// and keep a reference to s->immediate for when we remove the control from its parent
	[s->immediate retain];

	c = uiNew(uiControl);
	c->internal = s;
	c->destroy = singleDestroy;
	c->handle = singleHandle;
	c->setParent = singleSetParent;
	c->removeParent = singleRemoveParent;
	c->preferredSize = singlePreferredSize;
	c->resize = singleResize;
	c->visible = singleVisible;
	c->show = singleShow;
	c->hide = singleHide;
	c->containerShow = singleContainerShow;
	c->containerHide = singleContainerHide;
	c->enable = singleEnable;
	c->disable = singleDisable;
	c->containerEnable = singleContainerEnable;
	c->containerDisable = singleContainerDisable;

	return c;
}

BOOL uiDarwinControlFreeWhenAppropriate(uiControl *c, NSView *newSuperview)
{
	singleView *s = (singleView *) (c->internal);

	if (newSuperview == destroyedControlsView) {
		[s->immediate release];		// we don't need the reference anymore
		uiFree(s);
		uiFree(c);
		return YES;
	}
	return NO;
}