Update ConstrainedWindowViews appearance according to mock

ui/views/controls/button/chrome_style.cc

+// Copyright (c) 2012 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/controls/button/chrome_style.h"
+
+#include <algorithm>
+
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/color_utils.h"
+#include "ui/views/painter.h"
+#include "ui/views/background.h"
+
+namespace views {
+namespace {
+const int kMinWidth = 72;
+const int kMinHeight = 27;
+
+// Fractional position between top and bottom of button where the
+// gradient starts.
+const SkScalar kGradientStartLocation = SkFloatToScalar(0.38f);
+const SkColor kNormalBackgroundTopColor = SkColorSetRGB(0xf0, 0xf0, 0xf0);
+const SkColor kNormalBackgroundBottomColor = SkColorSetRGB(0xe0, 0xe0, 0xe0);
+const SkColor kHotBackgroundTopColor = SkColorSetRGB(0xf4, 0xf4, 0xf4);
+const SkColor kHotBackgroundBottomColor = SkColorSetRGB(0xe4, 0xe4, 0xe4);
+const SkColor kPushedBackgroundTopColor = SkColorSetRGB(0xeb, 0xeb, 0xeb);
+const SkColor kPushedBackgroundBottomColor = SkColorSetRGB(0xdb, 0xdb, 0xdb);
+const SkColor kDisabledBackgroundTopColor = SkColorSetRGB(0xed, 0xed, 0xed);
+const SkColor kDisabledBackgroundBottomColor = SkColorSetRGB(0xde, 0xde, 0xde);
+
+const SkColor kEnabledTextColor = SkColorSetRGB(0x33, 0x33, 0x33);
+const SkColor kDisabledTextColor = SkColorSetRGB(0xaa, 0xaa, 0xaa);
+const SkColor kHoverTextColor = SkColorSetRGB(0x0, 0x0, 0x0);
+
+const SkColor kTextShadowColor = SkColorSetRGB(0xf0, 0xf0, 0xf0);
+const int kTextShadowOffsetX = 0;
+const int kTextShadowOffsetY = 1;
+
+const int kBorderWidth = 1;
+const int kBorderRadius = 2;
+const SkColor kBorderNormalColor = SkColorSetARGB(0x3f, 0x0, 0x0, 0x0);
+const SkColor kBorderActiveColor = SkColorSetARGB(0x4b, 0x0, 0x0, 0x0);
+const SkColor kBorderDisabledColor = SkColorSetARGB(0x1d, 0x0, 0x0, 0x0);
+
+const int kFocusRingWidth = 2;
+const int kFocusRingRadius = 2;
+const SkColor kFocusRingColor = SkColorSetARGB(0x7f, 0xe5, 0x97, 0x00);
+
+// Returns the uniform inset of the button from its local bounds.
+int GetButtonInset() {
+  return std::max(kBorderWidth, kFocusRingWidth);
+}
+
+class ChromeStyleTextButtonBackground : public Background {
+ public:
+  ChromeStyleTextButtonBackground() {
+  }
+
+  virtual ~ChromeStyleTextButtonBackground() {
+  }
+
+  // Overriden from Background
+  virtual void Paint(gfx::Canvas* canvas, View* view) const {
+    if (painter_.get())
+    {
+      gfx::Rect bounds = view->GetLocalBounds();
+      // Inset to the actual button region.
+      int inset = GetButtonInset();
+      bounds.Inset(inset, inset, inset, inset);
+      Painter::PaintPainterAt(canvas, painter_.get(), bounds);
+    }
+  }
+
+  void SetColors(SkColor top, SkColor bottom) {
+    static const int count = 3;
+    SkColor colors[count] = { top, top, bottom };
+    SkScalar pos[count] = {
+      SkFloatToScalar(0.0f), kGradientStartLocation, SkFloatToScalar(1.0f) };
+
+    painter_.reset(
+        Painter::CreateVerticalMultiColorGradient(colors, pos, count));
+    SetNativeControlColor(
+        color_utils::AlphaBlend(colors[0], colors[count - 1], 128));
+  }
+
+ private:
+  scoped_ptr<Painter> painter_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeStyleTextButtonBackground);
+};
+
+class ChromeStyleTextButtonBorderPainter : public views::Painter {
+ public:
+  ChromeStyleTextButtonBorderPainter()
+      // This value should be updated prior to rendering; it's set to a
+      // well-defined value here defensively.
+      : color_(SkColorSetRGB(0x0, 0x0, 0x0)) {
+  }
+
+  // Overriden from Painter
+  virtual void Paint(gfx::Canvas* canvas, const gfx::Size& size) {
+    SkPaint paint;
+    paint.setStyle(SkPaint::kStroke_Style);
+    paint.setColor(color_);
+    paint.setStrokeWidth(kBorderWidth);
+
+    // Inset by 1/2 pixel to align the stroke with pixel centers.
+    SkScalar inset = SkFloatToScalar(0.5f);
+    SkRect rect = SkRect::MakeLTRB(inset, inset,
+                                   SkIntToScalar(size.width()) - inset,
+                                   SkIntToScalar(size.height()) - inset);
+
+    canvas->sk_canvas()->drawRoundRect(
+        rect, kBorderRadius, kBorderRadius, paint);
+  }
+
+  void set_color(SkColor color) {
+    color_ = color;
+  }
+
+ private:
+  SkColor color_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeStyleTextButtonBorderPainter);
+};
+
+
+class ChromeStyleTextButtonBorder : public views::Border {
+ public:
+  ChromeStyleTextButtonBorder()
+      : painter_(new ChromeStyleTextButtonBorderPainter) {
+  }
+
+  // Overriden from Border
+  virtual void Paint(const View& view, gfx::Canvas* canvas) const {
+    gfx::Rect bounds = view.GetLocalBounds();
+    int border_inset = GetButtonInset() - kBorderWidth;
+    bounds.Inset(border_inset, border_inset, border_inset, border_inset);
+    Painter::PaintPainterAt(canvas, painter_, bounds);
+  }
+  virtual void GetInsets(gfx::Insets* insets) const {
+    DCHECK(insets);
+    int inset = GetButtonInset();
+    insets->Set(inset, inset, inset, inset);
+  }
+
+  void SetColor(SkColor color) {
+    painter_->set_color(color);
+  }
+
+ private:
+  ChromeStyleTextButtonBorderPainter* painter_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeStyleTextButtonBorder);
+};
+
+class ChromeStyleFocusBorder : public views::FocusBorder {
+ public:
+  ChromeStyleFocusBorder() {}
+
+  // Overriden from Border
+  virtual void Paint(const View& view, gfx::Canvas* canvas) const {
+    gfx::Rect rect(view.GetLocalBounds());
+    SkScalar inset = SkFloatToScalar(GetButtonInset() - kFocusRingWidth / 2.0f);
+    rect.Inset(inset, inset);
+    SkPaint paint;
+    paint.setStyle(SkPaint::kStroke_Style);
+    paint.setStrokeWidth(SkIntToScalar(kFocusRingWidth));
+    paint.setColor(kFocusRingColor);
+    canvas->DrawRoundRect(rect, SkIntToScalar(kFocusRingRadius), paint);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChromeStyleFocusBorder);
+};
+
+class ChromeStyleStateChangedUpdater
+    : public CustomButtonStateChangedDelegate {
+ public:
+  // The background and border may be NULL.
+  ChromeStyleStateChangedUpdater(TextButton* button,
+                                 ChromeStyleTextButtonBackground* background,
+                                 ChromeStyleTextButtonBorder* border)
+      : button_(button),
+        background_(background),
+        border_(border),
+        prior_state_(button->state()) {
+    SetBackgroundForState(button->state());
+    SetShadowForState(button->state());
+    SetBorderColorForState(button->state());
+  }
+
+  virtual void StateChanged(CustomButton::ButtonState state) {
+    SetBackgroundForState(state);
+
+    // Update text shadow when transitioning to/from pushed state.
+    if (state == CustomButton::BS_PUSHED ||
+        prior_state_ == CustomButton::BS_PUSHED) {
+      SetShadowForState(state);
+    }
+
+    // Update border color.  We need to change it in all cases except hot
+    // followed by pushed.
+    if (!(state == CustomButton::BS_PUSHED &&
+          prior_state_ == CustomButton::BS_HOT)) {
+      SetBorderColorForState(state);
+    }
+
+    prior_state_ = state;
+  }
+
+ private:
+  void SetBackgroundForState(CustomButton::ButtonState state) {
+    if (!background_)
+      return;
+
+    SkColor top;
+    SkColor bottom;
+
+    switch (state) {
+      case CustomButton::BS_NORMAL:
+        top = kNormalBackgroundTopColor;
+        bottom = kNormalBackgroundBottomColor;
+        break;
+
+      case CustomButton::BS_HOT:
+        top = kHotBackgroundTopColor;
+        bottom = kHotBackgroundBottomColor;
+        break;
+
+      case CustomButton::BS_PUSHED:
+        top = kPushedBackgroundTopColor;
+        bottom = kPushedBackgroundBottomColor;
+        break;
+
+      case CustomButton::BS_DISABLED:
+        top = kDisabledBackgroundTopColor;
+        bottom = kDisabledBackgroundBottomColor;
+        break;
+
+      default:
+        NOTREACHED();
+        return;
+        break;
+    }
+
+    background_->SetColors(top, bottom);
+  }
+
+  void SetShadowForState(CustomButton::ButtonState state) {
+    if (state == CustomButton::BS_PUSHED) {
+      // Turn off text shadow.
+      button_->ClearEmbellishing();
+    } else {
+      button_->SetTextShadowColors(kTextShadowColor, kTextShadowColor);
+      button_->SetTextShadowOffset(kTextShadowOffsetX, kTextShadowOffsetY);
+    }
+  }
+
+  void SetBorderColorForState(CustomButton::ButtonState state) {
+    if (!border_)
+      return;
+
+    SkColor border_color;
+
+    switch (state) {
+      case CustomButton::BS_NORMAL:
+        border_color = kBorderNormalColor;
+        break;
+
+      case CustomButton::BS_HOT:
+      case CustomButton::BS_PUSHED:
+        border_color = kBorderActiveColor;
+        break;
+
+      case CustomButton::BS_DISABLED:
+        border_color = kBorderDisabledColor;
+        break;
+
+      default:
+        NOTREACHED();
+        return;
+        break;
+    }
+
+    border_->SetColor(border_color);
+  }
+
+  // Weak pointer to the associated button.
+  TextButton* button_;
+
+  // Weak pointers to background and border owned by the CustomButton.
+  ChromeStyleTextButtonBackground* background_;
+  ChromeStyleTextButtonBorder* border_;
+
+  CustomButton::ButtonState prior_state_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeStyleStateChangedUpdater);
+};
+}  // namespace
+
+
+void ApplyChromeStyle(TextButton* button) {
+  button->set_focusable(true);
+  button->set_request_focus_on_press(false);
+
+  button->set_alignment(TextButton::ALIGN_CENTER);
+  button->set_min_width(kMinWidth);
+  button->set_min_height(kMinHeight);
+
+  button->SetEnabledColor(kEnabledTextColor);
+  button->SetDisabledColor(kDisabledTextColor);
+  button->SetHoverColor(kHoverTextColor);
+
+  ChromeStyleTextButtonBackground* background =
+      new ChromeStyleTextButtonBackground;
+  button->set_background(background);
+
+  ChromeStyleTextButtonBorder* border = new ChromeStyleTextButtonBorder;
+  button->set_border(border);
+
+  button->set_focus_border(new ChromeStyleFocusBorder);
+
+  ChromeStyleStateChangedUpdater* state_changed_updater =
+      new ChromeStyleStateChangedUpdater(button, background, border);
+
+  button->set_state_changed_delegate(state_changed_updater);
+}
+
+}  // namespace views