"Bootstrap" a toolkit-views Typography spec.

ui/views/style/typography.cc

+// Copyright 2017 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/style/typography.h"
+
+#include "base/logging.h"
+#include "ui/base/default_style.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace views {
+namespace {
+
+constexpr int kHeadlineDelta = 8;
+constexpr int kDialogMessageDelta = 1;
+
+// The default provider aims to provide values to match pre-Harmony constants
+// for the given contexts so that old UI does not change.
+class DefaultProvider : public TypographyProvider {
+ public:
+  DefaultProvider() {}
+
+  const gfx::FontList& GetFont(TextContext context, TextStyle style) override;
+  SkColor GetColor(TextContext context, TextStyle style) override;
+  int GetLineSpacing(TextContext context, TextStyle style) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DefaultProvider);
+};
+
+const gfx::FontList& DefaultProvider::GetFont(TextContext context,
+                                              TextStyle style) {
+  int size_delta = 0;
+  gfx::Font::Weight font_weight = gfx::Font::Weight::NORMAL;
+  switch (context.value()) {
+    case TextContext::HEADLINE:
+      size_delta = kHeadlineDelta;
+      break;
+    case TextContext::DIALOG_TITLE:
+      size_delta = ui::kTitleFontSizeDelta;
+      break;
+    case TextContext::DIALOG_MESSAGE:
+      // Note: Not using ui::kMessageFontSizeDelta, so is 13pt in most cases.
+      size_delta = kDialogMessageDelta;
+      break;
+    case TextContext::CONTROL_LABEL:
+    case TextContext::FIELD:
+    case TextContext::BUTTON_TEXT:
+      size_delta = ui::kLabelFontSizeDelta;
+      break;
+  }
+  switch (style) {
+    case TextStyle::WEB_DOMAIN:
+    case TextStyle::ACTIVE_TAB:
+    case TextStyle::EXTENSION_NAME:
+      font_weight = gfx::Font::Weight::BOLD;
+      break;
+    default:
+      break;
+  }
+  constexpr gfx::Font::FontStyle kFontStyle = gfx::Font::NORMAL;
+  return ResourceBundle::GetSharedInstance().GetFontListWithDelta(
+      size_delta, kFontStyle, font_weight);
+}
+
+SkColor DefaultProvider::GetColor(TextContext context, TextStyle style) {
+  return SK_ColorBLACK;
+}
+
+int DefaultProvider::GetLineSpacing(TextContext context, TextStyle style) {
+  return 0;
+}
+
+std::unique_ptr<TypographyProvider>& Storage() {
+  CR_DEFINE_STATIC_LOCAL(std::unique_ptr<TypographyProvider>, storage,
+                         (new DefaultProvider));
+  return storage;
+}
+
+}  // namespace
+
+// Linker storage.
+const TextContext::Value TextContext::HEADLINE;
+const TextContext::Value TextContext::DIALOG_TITLE;
+const TextContext::Value TextContext::DIALOG_MESSAGE;
+const TextContext::Value TextContext::CONTROL_LABEL;
+const TextContext::Value TextContext::FIELD;
+const TextContext::Value TextContext::BUTTON_TEXT;
+
+// static
+void Typography::SetProvider(std::unique_ptr<TypographyProvider> provider) {
+  DCHECK(provider);
+  Storage() = std::move(provider);
+}
+
+// static
+const gfx::FontList& Typography::GetFont(TextContext context, TextStyle style) {
+  return Storage()->GetFont(context, style);
+}
+
+// static
+SkColor Typography::GetColor(TextContext context, TextStyle style) {
+  return Storage()->GetColor(context, style);
+}
+
+// static
+int Typography::GetLineSpacing(TextContext context, TextStyle style) {
+  return Storage()->GetLineSpacing(context, style);
+}
+
+}  // namespace views