MacViews: Implement Tooltips

ui/views/cocoa/tooltip_manager_mac.mm

Index: ui/views/cocoa/tooltip_manager_mac.mm
diff --git a/ui/views/cocoa/tooltip_manager_mac.mm b/ui/views/cocoa/tooltip_manager_mac.mm
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+++ b/ui/views/cocoa/tooltip_manager_mac.mm
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/views/cocoa/tooltip_manager_mac.h"
+
+#include "ui/gfx/font_list.h"
+#import "ui/gfx/mac/coordinate_conversion.h"
+#import "ui/views/cocoa/bridged_content_view.h"
+#import "ui/views/cocoa/bridged_native_widget.h"
+
+namespace {
+
+// Max visual tooltip width in DIPs. Beyond this, Cocoa will wrap text.
+const int kTooltipMaxWidthPixels = 250;
+
+}  // namespace
+
+namespace views {
+
+TooltipManagerMac::TooltipManagerMac(BridgedNativeWidget* widget)
+    : widget_(widget) {
+}
+
+TooltipManagerMac::~TooltipManagerMac() {
+}
+
+int TooltipManagerMac::GetMaxWidth(const gfx::Point& location,
+                                   gfx::NativeView context) const {
+  return kTooltipMaxWidthPixels;
+}
+
+const gfx::FontList& TooltipManagerMac::GetFontList() const {
+  CR_DEFINE_STATIC_LOCAL(gfx::FontList, font_list,
+                         (gfx::Font([NSFont toolTipsFontOfSize:0])));
+  return font_list;
+}
+
+void TooltipManagerMac::UpdateTooltip() {
+  NSWindow* window = widget_->ns_window();
+  BridgedContentView* view = widget_->ns_view();
+
+  NSPoint nspoint = [window convertScreenToBase:[NSEvent mouseLocation]];
+  // Note: flip in the view's frame, which matches the window's contentRect.
+  gfx::Point point(nspoint.x, NSHeight([view frame]) - nspoint.y);
+  [view updateTooltipIfRequiredAt:point];
+}
+
+void TooltipManagerMac::TooltipTextChanged(View* view) {
+  // The intensive part is View::GetTooltipHandlerForPoint(), which will be done
+  // in [BridgedContentView updateTooltipIfRequiredAt:]. Don't do it here as
+  // well.
+  UpdateTooltip();
+}
+
+}  // namespace views