Use native Cocoa tooltips instead of Mozilla's ToolTip class.

chrome/browser/renderer_host/render_widget_host_view_mac.mm

Index: chrome/browser/renderer_host/render_widget_host_view_mac.mm
===================================================================
--- chrome/browser/renderer_host/render_widget_host_view_mac.mm	(revision 19944)
+++ chrome/browser/renderer_host/render_widget_host_view_mac.mm	(working copy)
@@ -13,7 +13,6 @@
 #include "chrome/browser/renderer_host/render_widget_host.h"
 #include "chrome/common/native_web_keyboard_event.h"
 #include "skia/ext/platform_canvas.h"
-#import "third_party/mozilla/include/ToolTip.h"
 #include "webkit/api/public/mac/WebInputEventFactory.h"
 #include "webkit/api/public/WebInputEvent.h"
 #include "webkit/glue/webmenurunner_mac.h"
@@ -108,11 +107,6 @@
   // everything again when we become selected again.
   is_hidden_ = true;
 
-  // We can't have tooltips floating around after the tools they're tipping
-  // about are hidden, can we?
-  tooltip_.reset(NULL);
-  tooltip_text_.clear();
-
   // If we have a renderer, then inform it that we are being hidden so it can
   // reduce its resource utilization.
   render_widget_host_->WasHidden();
@@ -267,18 +261,7 @@
 
 // Called from the renderer to tell us what the tooltip text should be. It
 // calls us frequently so we need to cache the value to prevent doing a lot
-// of repeat work. We cannot simply use [-NSView setToolTip:] because NSView
-// can't handle the case where the tooltip text changes while the mouse is
-// still inside the view. Since the page elements that get tooltips are all
-// contained within this view (and are unknown to the NSView system), we
-// are forced to implement our own tooltips with child windows.
-// TODO(pinkerton): Do we want these tooltips to time out after a certain time?
-// Gecko does this automatically in the back-end, hence the ToolTip class not
-// needing that functionality. We can either modify ToolTip or add this
-// functionality here with a timer.
-// TODO(pinkerton): This code really needs to live at a higher level because
-// right now it allows multiple views in multiple tabs to each be displaying
-// a tooltip simultaneously (http://crbug.com/14178).
+// of repeat work.
 void RenderWidgetHostViewMac::SetTooltipText(const std::wstring& tooltip_text) {
   if (tooltip_text != tooltip_text_ && [[cocoa_view_ window] isKeyWindow]) {
     tooltip_text_ = tooltip_text;
@@ -292,19 +275,7 @@
       display_text = tooltip_text_.substr(0, kMaxTooltipLength);
 
     NSString* tooltip_nsstring = base::SysWideToNSString(display_text);
-    if ([tooltip_nsstring length] == 0) {
-      tooltip_.reset(NULL);  // The dtor closes the tooltip.
-    } else {
-      // Get the current mouse location in the window's coordinate system and
-      // use that as the point for displaying the tooltip.
-      if (!tooltip_.get())
-        tooltip_.reset([[ToolTip alloc] init]);
-      NSPoint event_point =
-          [[cocoa_view_ window] mouseLocationOutsideOfEventStream];
-      [tooltip_ showToolTipAtPoint:event_point
-                        withString:tooltip_nsstring
-                        overWindow:[cocoa_view_ window]];
-    }
+    [cocoa_view_ setToolTipAtMousePoint:tooltip_nsstring];
   }
 }
 
@@ -367,6 +338,10 @@
   // Do not touch any members at this point, |this| has been deleted.
 }
 
+
+
+// RenderWidgetHostViewCocoa ---------------------------------------------------
+
 @implementation RenderWidgetHostViewCocoa
 
 // Tons of stuff goes here, where we grab events going on in Cocoaland and send
@@ -387,6 +362,7 @@
 
 - (void)dealloc {
   delete renderWidgetHostView_;
+  [toolTip_ release];
 
   [super dealloc];
 }
@@ -570,5 +546,192 @@
   return renderWidgetHostView_;
 }
 
+
+// Below is the nasty tooltip stuff -- copied from WebKit's WebHTMLView.mm
+// with minor modifications for code style and commenting.
+//
+//  The 'public' interface is -setToolTipAtMousePoint:. This differs from
+// -setToolTip: in that the updated tooltip takes effect immediately,
+//  without the user's having to move the mouse out of and back into the view.
+//
+// Unfortunately, doing this requires sending fake mouseEnter/Exit events to
+// the view, which in turn requires overriding some internal tracking-rect
+// methods (to keep track of its owner & userdata, which need to be filled out
+// in the fake events.) --snej 7/6/09
+
+
+/*
+ * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *           (C) 2006, 2007 Graham Dennis (graham.dennis@gmail.com)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// Any non-zero value will do, but using something recognizable might help us
+// debug some day.
+static const NSTrackingRectTag kTrackingRectTag = 0xBADFACE;
+
+// Override of a public NSView method, replacing the inherited functionality.
+// See above for rationale.
+- (NSTrackingRectTag)addTrackingRect:(NSRect)rect
+                               owner:(id)owner
+                            userData:(void *)data
+                        assumeInside:(BOOL)assumeInside {
+  DCHECK(trackingRectOwner_ == nil);
+  trackingRectOwner_ = owner;
+  trackingRectUserData_ = data;
+  return kTrackingRectTag;
+}
+
+// Override of (apparently) a private NSView method(!) See above for rationale.
+- (NSTrackingRectTag)_addTrackingRect:(NSRect)rect
+                                owner:(id)owner
+                             userData:(void *)data
+                         assumeInside:(BOOL)assumeInside
+                       useTrackingNum:(int)tag {
+  DCHECK(tag == 0 || tag == kTrackingRectTag);
+  DCHECK(trackingRectOwner_ == nil);
+  trackingRectOwner_ = owner;
+  trackingRectUserData_ = data;
+  return kTrackingRectTag;
+}
+
+// Override of (apparently) a private NSView method(!) See above for rationale.
+- (void)_addTrackingRects:(NSRect *)rects
+                    owner:(id)owner
+             userDataList:(void **)userDataList
+         assumeInsideList:(BOOL *)assumeInsideList
+             trackingNums:(NSTrackingRectTag *)trackingNums
+                    count:(int)count {
+  DCHECK(count == 1);
+  DCHECK(trackingNums[0] == 0 || trackingNums[0] == kTrackingRectTag);
+  DCHECK(trackingRectOwner_ == nil);
+  trackingRectOwner_ = owner;
+  trackingRectUserData_ = userDataList[0];
+  trackingNums[0] = kTrackingRectTag;
+}
+
+// Override of a public NSView method, replacing the inherited functionality.
+// See above for rationale.
+- (void)removeTrackingRect:(NSTrackingRectTag)tag {
+  if (tag == 0)
+    return;
+
+  if (tag == kTrackingRectTag) {
+    trackingRectOwner_ = nil;
+    return;
+  }
+
+  if (tag == lastToolTipTag_) {
+    [super removeTrackingRect:tag];
+    lastToolTipTag_ = 0;
+    return;
+  }
+
+  // If any other tracking rect is being removed, we don't know how it was
+  // created and it's possible there's a leak involved (see Radar 3500217).
+  NOTREACHED();
+}
+
+// Override of (apparently) a private NSView method(!)
+- (void)_removeTrackingRects:(NSTrackingRectTag *)tags count:(int)count {
+  for (int i = 0; i < count; ++i) {
+    int tag = tags[i];
+    if (tag == 0)
+      continue;
+    DCHECK(tag == kTrackingRectTag);
+    trackingRectOwner_ = nil;
+  }
+}
+
+// Sends a fake NSMouseExited event to the view for its current tracking rect.
+- (void)_sendToolTipMouseExited {
+  // Nothing matters except window, trackingNumber, and userData.
+  int windowNumber = [[self window] windowNumber];
+  NSEvent *fakeEvent = [NSEvent enterExitEventWithType:NSMouseExited
+                                              location:NSMakePoint(0, 0)
+                                         modifierFlags:0
+                                             timestamp:0
+                                          windowNumber:windowNumber
+                                               context:NULL
+                                           eventNumber:0
+                                        trackingNumber:kTrackingRectTag
+                                              userData:trackingRectUserData_];
+  [trackingRectOwner_ mouseExited:fakeEvent];
+}
+
+// Sends a fake NSMouseEntered event to the view for its current tracking rect.
+- (void)_sendToolTipMouseEntered {
+  // Nothing matters except window, trackingNumber, and userData.
+  int windowNumber = [[self window] windowNumber];
+  NSEvent *fakeEvent = [NSEvent enterExitEventWithType:NSMouseEntered
+                                              location:NSMakePoint(0, 0)
+                                         modifierFlags:0
+                                             timestamp:0
+                                          windowNumber:windowNumber
+                                               context:NULL
+                                           eventNumber:0
+                                        trackingNumber:kTrackingRectTag
+                                              userData:trackingRectUserData_];
+  [trackingRectOwner_ mouseEntered:fakeEvent];
+}
+
+// Sets the view's current tooltip, to be displayed at the current mouse
+// location. (This does not make the tooltip appear -- as usual, it only
+// appears after a delay.) Pass null to remove the tooltip.
+- (void)setToolTipAtMousePoint:(NSString *)string {
+  NSString *toolTip = [string length] == 0 ? nil : string;
+  NSString *oldToolTip = toolTip_;
+  if ((toolTip == nil || oldToolTip == nil) ? toolTip == oldToolTip
+                                    : [toolTip isEqualToString:oldToolTip]) {
+    return;
+  }
+  if (oldToolTip) {
+    [self _sendToolTipMouseExited];
+    [oldToolTip release];
+  }
+  toolTip_ = [toolTip copy];
+  if (toolTip) {
+    // See radar 3500217 for why we remove all tooltips
+    // rather than just the single one we created.
+    [self removeAllToolTips];
+    NSRect wideOpenRect = NSMakeRect(-100000, -100000, 200000, 200000);
+    lastToolTipTag_ = [self addToolTipRect:wideOpenRect
+                                     owner:self
+                                  userData:NULL];
+    [self _sendToolTipMouseEntered];
+  }
+}
+
+// NSView calls this to get the text when displaying the tooltip.
+- (NSString *)view:(NSView *)view
+  stringForToolTip:(NSToolTipTag)tag
+             point:(NSPoint)point
+          userData:(void *)data {
+  return [[toolTip_ copy] autorelease];
+}
+
 @end