ui/base/cocoa/nsview_additions.mm

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/mac/sdk_forward_declarations.h"
   6 #import "ui/base/cocoa/nsview_additions.h"
   7 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
   8
   9 #include "base/logging.h"
  10
  11 @implementation NSView (ChromeAdditions)
  12
  13 - (CGFloat)cr_lineWidth {
  14   // All shipping retina macs run at least 10.7.
  15   if (![self respondsToSelector:@selector(convertSizeFromBacking:)])
  16     return 1;
  17   return [self convertSizeFromBacking:NSMakeSize(1, 1)].width;
  18 }
  19
  20 - (BOOL)cr_isMouseInView {
  21   NSPoint mouseLoc = [[self window] mouseLocationOutsideOfEventStream];
  22   mouseLoc = [[self superview] convertPoint:mouseLoc fromView:nil];
  23   return [self hitTest:mouseLoc] == self;
  24 }
  25
  26 - (BOOL)cr_isBelowView:(NSView*)otherView {
  27   NSArray* subviews = [[self superview] subviews];
  28
  29   NSUInteger selfIndex = [subviews indexOfObject:self];
  30   DCHECK_NE(NSNotFound, selfIndex);
  31
  32   NSUInteger otherIndex = [subviews indexOfObject:otherView];
  33   DCHECK_NE(NSNotFound, otherIndex);
  34
  35   return selfIndex < otherIndex;
  36 }
  37
  38 - (BOOL)cr_isAboveView:(NSView*)otherView {
  39   return ![self cr_isBelowView:otherView];
  40 }
  41
  42 - (void)cr_ensureSubview:(NSView*)subview
  43             isPositioned:(NSWindowOrderingMode)place
  44               relativeTo:(NSView *)otherView {
  45   DCHECK(place == NSWindowAbove || place == NSWindowBelow);
  46   BOOL isAbove = place == NSWindowAbove;
  47   if ([[subview superview] isEqual:self] &&
  48       [subview cr_isAboveView:otherView] == isAbove) {
  49     return;
  50   }
  51
  52   [subview removeFromSuperview];
  53   [self addSubview:subview
  54         positioned:place
  55         relativeTo:otherView];
  56 }
  57
  58 - (NSColor*)cr_keyboardFocusIndicatorColor {
  59   return [[NSColor keyboardFocusIndicatorColor]
  60       colorWithAlphaComponent:0.5 / [self cr_lineWidth]];
  61 }
  62
  63 - (void)cr_recursivelyInvokeBlock:(void (^)(id view))block {
  64   block(self);
  65   for (NSView* subview in [self subviews])
  66     [subview cr_recursivelyInvokeBlock:block];
  67 }
  68
  69 - (void)cr_recursivelySetNeedsDisplay:(BOOL)flag {
  70   [self setNeedsDisplay:YES];
  71   for (NSView* child in [self subviews])
  72     [child cr_recursivelySetNeedsDisplay:flag];
  73 }
  74
  75 static NSView* g_ancestorBeingDrawnFrom = nil;
  76 static NSView* g_childBeingDrawnTo = nil;
  77
  78 - (void)cr_drawUsingAncestor:(NSView*)ancestorView inRect:(NSRect)rect {
  79   gfx::ScopedNSGraphicsContextSaveGState scopedGSState;
  80   NSRect frame = [self convertRect:[self bounds] toView:ancestorView];
  81   NSAffineTransform* transform = [NSAffineTransform transform];
  82   if ([self isFlipped] == [ancestorView isFlipped]) {
  83     [transform translateXBy:-NSMinX(frame) yBy:-NSMinY(frame)];
  84   } else {
  85     [transform translateXBy:-NSMinX(frame) yBy:NSMaxY(frame)];
  86     [transform scaleXBy:1.0 yBy:-1.0];
  87   }
  88   [transform concat];
  89
  90   // This can be made robust to recursive calls, but is as of yet unneeded.
  91   DCHECK(!g_ancestorBeingDrawnFrom && !g_childBeingDrawnTo);
  92   g_ancestorBeingDrawnFrom = ancestorView;
  93   g_childBeingDrawnTo = self;
  94   [ancestorView drawRect:[ancestorView bounds]];
  95   g_childBeingDrawnTo = nil;
  96   g_ancestorBeingDrawnFrom = nil;
  97 }
  98
  99 - (NSView*)cr_viewBeingDrawnTo {
 100   if (!g_ancestorBeingDrawnFrom)
 101     return self;
 102   DCHECK(g_ancestorBeingDrawnFrom == self);
 103   return g_childBeingDrawnTo;
 104 }
 105
 106 @end