Make views::Label and views::Link auto-color themselves to be readable over their background colo...

chrome/browser/chromeos/drop_shadow_label.cc

 // Copyright (c) 2010 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 "chrome/browser/chromeos/drop_shadow_label.h"
 
 #include "base/utf_string_conversions.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/color_utils.h"
 
 using views::Label;
 
 namespace chromeos {
 
 static const int kDefaultDropShadowSize = 2;
 
-// Default color is black.
-static const SkColor kDefaultColor = 0x000000;
-
-static const float kShadowOpacity = 0.2;
-
-DropShadowLabel::DropShadowLabel() : Label() {
-  Init();
-}
-
-void DropShadowLabel::Init() {
-  drop_shadow_size_ = kDefaultDropShadowSize;
+DropShadowLabel::DropShadowLabel() : drop_shadow_size_(kDefaultDropShadowSize) {
 }
 
 void DropShadowLabel::SetDropShadowSize(int drop_shadow_size) {
   if (drop_shadow_size != drop_shadow_size_) {
     drop_shadow_size_ = drop_shadow_size;
     invalidate_text_size();
     SchedulePaint();
   }
 }
 
 void DropShadowLabel::PaintText(gfx::Canvas* canvas,
                                 const string16& text,
                                 const gfx::Rect& text_bounds,
                                 int flags) {
+  SkColor text_color = IsEnabled() ? enabled_color() : disabled_color();
   if (drop_shadow_size_ > 0) {
-    SkColor color = SkColorSetARGB(kShadowOpacity * SkColorGetA(GetColor()),
-                                   SkColorGetR(kDefaultColor),
-                                   SkColorGetG(kDefaultColor),
-                                   SkColorGetB(kDefaultColor));
+    const float kShadowOpacity = 0.2;
+    const SkColor shadow_color =
+        SkColorSetA(SK_ColorBLACK, kShadowOpacity * SkColorGetA(text_color));
     for (int i = 0; i < drop_shadow_size_; i++) {
-      canvas->DrawStringInt(text, font(), color,
+      canvas->DrawStringInt(text, font(), shadow_color,
                             text_bounds.x() + i, text_bounds.y(),
                             text_bounds.width(), text_bounds.height(), flags);
-      canvas->DrawStringInt(text, font(), color,
+      canvas->DrawStringInt(text, font(), shadow_color,
                             text_bounds.x() + i, text_bounds.y() + i,
                             text_bounds.width(), text_bounds.height(), flags);
-      canvas->DrawStringInt(text, font(), color,
+      canvas->DrawStringInt(text, font(), shadow_color,
                             text_bounds.x(), text_bounds.y() + i,
                             text_bounds.width(), text_bounds.height(), flags);
     }
   }
 
-  canvas->DrawStringInt(text, font(), GetColor(),
-                        text_bounds.x(), text_bounds.y(),
-                        text_bounds.width(), text_bounds.height(), flags);
+  canvas->DrawStringInt(text, font(), text_color, text_bounds.x(),
+      text_bounds.y(), text_bounds.width(), text_bounds.height(), flags);
 
   if (HasFocus() || paint_as_focused()) {
     gfx::Rect focus_bounds = text_bounds;
     focus_bounds.Inset(-Label::kFocusBorderPadding,
                        -Label::kFocusBorderPadding);
     canvas->DrawFocusRect(focus_bounds.x(), focus_bounds.y(),
                           focus_bounds.width(), focus_bounds.height());
   }
 }
 
 gfx::Size DropShadowLabel::GetTextSize() const {
   gfx::Size text_size = Label::GetTextSize();
   text_size.SetSize(text_size.width() + drop_shadow_size_,
                     text_size.height() + drop_shadow_size_);
   return text_size;
 }
 
 }  // namespace chromeos