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      1 // Copyright (c) 2010 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 "chrome/browser/chromeos/drop_shadow_label.h"
      6 
      7 #include "base/utf_string_conversions.h"
      8 #include "ui/gfx/canvas.h"
      9 #include "ui/gfx/color_utils.h"
     10 
     11 using views::Label;
     12 
     13 namespace chromeos {
     14 
     15 static const int kDefaultDropShadowSize = 2;
     16 
     17 // Default color is black.
     18 static const SkColor kDefaultColor = 0x000000;
     19 
     20 static const float kShadowOpacity = 0.2;
     21 
     22 DropShadowLabel::DropShadowLabel() : Label() {
     23   Init();
     24 }
     25 
     26 void DropShadowLabel::Init() {
     27   drop_shadow_size_ = kDefaultDropShadowSize;
     28 }
     29 
     30 void DropShadowLabel::SetDropShadowSize(int drop_shadow_size) {
     31   if (drop_shadow_size != drop_shadow_size_) {
     32     drop_shadow_size_ = drop_shadow_size;
     33     invalidate_text_size();
     34     SchedulePaint();
     35   }
     36 }
     37 
     38 void DropShadowLabel::PaintText(gfx::Canvas* canvas,
     39                                 const std::wstring& text,
     40                                 const gfx::Rect& text_bounds,
     41                                 int flags) {
     42   if (drop_shadow_size_ > 0) {
     43     SkColor color = SkColorSetARGB(kShadowOpacity * SkColorGetA(GetColor()),
     44                                    SkColorGetR(kDefaultColor),
     45                                    SkColorGetG(kDefaultColor),
     46                                    SkColorGetB(kDefaultColor));
     47     for (int i = 0; i < drop_shadow_size_; i++) {
     48       canvas->DrawStringInt(WideToUTF16Hack(text), font(), color,
     49                             text_bounds.x() + i, text_bounds.y(),
     50                             text_bounds.width(), text_bounds.height(), flags);
     51       canvas->DrawStringInt(WideToUTF16Hack(text), font(), color,
     52                             text_bounds.x() + i, text_bounds.y() + i,
     53                             text_bounds.width(), text_bounds.height(), flags);
     54       canvas->DrawStringInt(WideToUTF16Hack(text), font(), color,
     55                             text_bounds.x(), text_bounds.y() + i,
     56                             text_bounds.width(), text_bounds.height(), flags);
     57     }
     58   }
     59 
     60   canvas->DrawStringInt(WideToUTF16Hack(text), font(), GetColor(),
     61                         text_bounds.x(), text_bounds.y(),
     62                         text_bounds.width(), text_bounds.height(), flags);
     63 
     64   if (HasFocus() || paint_as_focused()) {
     65     gfx::Rect focus_bounds = text_bounds;
     66     focus_bounds.Inset(-Label::kFocusBorderPadding,
     67                        -Label::kFocusBorderPadding);
     68     canvas->DrawFocusRect(focus_bounds.x(), focus_bounds.y(),
     69                           focus_bounds.width(), focus_bounds.height());
     70   }
     71 }
     72 
     73 gfx::Size DropShadowLabel::GetTextSize() const {
     74   gfx::Size text_size = Label::GetTextSize();
     75   text_size.SetSize(text_size.width() + drop_shadow_size_,
     76                     text_size.height() + drop_shadow_size_);
     77   return text_size;
     78 }
     79 
     80 }  // namespace chromeos
     81