"Bootstrap" a toolkit-views Typography spec.

chrome/browser/ui/views/harmony/layout_delegate_unittest.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 "chrome/browser/ui/views/chrome_views_delegate.h"
+#include "chrome/browser/ui/views/harmony/chrome_typography.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/default_style.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/font_list.h"
+#include "ui/views/style/typography.h"
+#include "ui/views/style/typography_provider.h"
+
+#if defined(OS_MACOSX)
+#include "base/mac/mac_util.h"
+#endif
+
+using views::typography::GetFont;

[Peter Kasting, 2017/03/17 02:26:00]

Nit: Consider moving this to the one function below that actually uses it.

[tapted, 2017/03/17 10:33:10]

Done.

+
+// Check legacy font sizes. No new code should be using these constants, but if
+// these tests ever fail it probably means something in the old UI will have
+// changed by mistake.
+// Disabled since this relies on machine configuration. http://crbug.com/701241.
+TEST(LayoutDelegateTest, DISABLED_LegacyFontSizeConstants) {
+  ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+  gfx::FontList label_font = rb.GetFontListWithDelta(ui::kLabelFontSizeDelta);
+
+  EXPECT_EQ(12, label_font.GetFontSize());
+  EXPECT_EQ(15, label_font.GetHeight());
+  EXPECT_EQ(12, label_font.GetBaseline());
+  EXPECT_EQ(9, label_font.GetCapHeight());
+// Note some Windows bots report 11,13,11,9 for the above.
+// TODO(tapted): Smoke them out and figure out why.
+
+#if defined(OS_MACOSX)
+  if (base::mac::IsOS10_9()) {
+    EXPECT_EQ(6, label_font.GetExpectedTextWidth(1));
+  } else {
+    EXPECT_EQ(10, label_font.GetExpectedTextWidth(1));
+  }
+#else
+  EXPECT_EQ(6, label_font.GetExpectedTextWidth(1));
+// Some Windows bots may say 5.
+#endif
+
+  gfx::FontList title_font = rb.GetFontListWithDelta(ui::kTitleFontSizeDelta);
+
+#if defined(OS_WIN)
+  EXPECT_EQ(15, title_font.GetFontSize());
+  EXPECT_EQ(20, title_font.GetHeight());
+  EXPECT_EQ(16, title_font.GetBaseline());
+  EXPECT_EQ(11, title_font.GetCapHeight());
+#elif defined(OS_MACOSX)
+  EXPECT_EQ(14, title_font.GetFontSize());
+  EXPECT_EQ(17, title_font.GetHeight());
+  EXPECT_EQ(14, title_font.GetBaseline());
+  if (base::mac::IsOS10_9()) {
+    EXPECT_EQ(11, title_font.GetCapHeight());
+  } else {
+    EXPECT_EQ(10, title_font.GetCapHeight());
+  }
+#else
+  EXPECT_EQ(15, title_font.GetFontSize());
+  EXPECT_EQ(18, title_font.GetHeight());
+  EXPECT_EQ(14, title_font.GetBaseline());
+  EXPECT_EQ(11, title_font.GetCapHeight());
+#endif
+
+#if defined(OS_MACOSX)
+  if (base::mac::IsOS10_9()) {
+    EXPECT_EQ(7, title_font.GetExpectedTextWidth(1));
+  } else {
+    EXPECT_EQ(12, title_font.GetExpectedTextWidth(1));
+  }
+#else
+  EXPECT_EQ(8, title_font.GetExpectedTextWidth(1));
+#endif
+
+  gfx::FontList small_font = rb.GetFontList(ResourceBundle::SmallFont);

[Peter Kasting, 2017/03/17 02:26:00]

BTW, are we trying to phase out these various ResourceBundle font specifiers
over time?  Does that come later?  Do we need a note in ResourceBundle marking
these as deprecated and saying what to do instead?

[tapted, 2017/03/17 10:33:10]

Yes - I want to get rid of them. This will be easiest when a lot of Cocoa UI
that uses them is no longer needed. And I'm hoping that by gradually phasing out
views interfaces that accept a gfx::FontList them, they will be pointed to the
typography stuff.

But code that doesn't have access to views::style::* is going to need them, and
the current advice in resource_bundle.h , i.e., "Phase these out in favour of
client code providing their own constant with the desired font size delta." is
the correct hint for that code (i.e. to use GetFontListWithDelta() -- the
methods that take e.g. ResourceBundle::SmallFont already say "Deprecated":

  // Deprecated. Returns fonts using hard-coded size deltas implied by |style|.
  const gfx::FontList& GetFontList(FontStyle style);
  const gfx::Font& GetFont(FontStyle style);
.

[Peter Kasting, 2017/03/17 20:59:39]

OK.  Would be nice to someday rename these ...Deprecated() or something to try
to push people off them, but it sounds like there should be no action taken in
this patch, or any immediate followup.

+  gfx::FontList base_font = rb.GetFontList(ResourceBundle::BaseFont);
+  gfx::FontList bold_font = rb.GetFontList(ResourceBundle::BoldFont);
+  gfx::FontList medium_font = rb.GetFontList(ResourceBundle::MediumFont);
+  gfx::FontList medium_bold_font =
+      rb.GetFontList(ResourceBundle::MediumBoldFont);
+  gfx::FontList large_font = rb.GetFontList(ResourceBundle::LargeFont);
+
+#if defined(OS_MACOSX)
+  EXPECT_EQ(12, small_font.GetFontSize());
+  EXPECT_EQ(13, base_font.GetFontSize());
+  EXPECT_EQ(13, bold_font.GetFontSize());
+  EXPECT_EQ(16, medium_font.GetFontSize());
+  EXPECT_EQ(16, medium_bold_font.GetFontSize());
+  EXPECT_EQ(21, large_font.GetFontSize());
+#else
+  EXPECT_EQ(11, small_font.GetFontSize());
+  EXPECT_EQ(12, base_font.GetFontSize());
+  EXPECT_EQ(12, bold_font.GetFontSize());
+  EXPECT_EQ(15, medium_font.GetFontSize());
+  EXPECT_EQ(15, medium_bold_font.GetFontSize());
+  EXPECT_EQ(20, large_font.GetFontSize());
+#endif
+}
+
+// Check that asking for fonts of a given size match the Harmony spec.

[Peter Kasting, 2017/03/17 02:26:00]

Nit: Might want to write in the comment what action someone should take if this
test starts failing in the future.

[tapted, 2017/03/17 10:33:10]

Done.

+// Disabled since this relies on machine configuration. http://crbug.com/701241.
+TEST(LayoutDelegateTest, DISABLED_RequestFontBySize) {
+#if defined(OS_MACOSX)
+  constexpr int kBase = 13;
+#else
+  constexpr int kBase = 12;
+#endif
+  // Harmony spec.
+  constexpr int kHeadline = 20;
+  constexpr int kTitle = 15;  // Leading 22.
+  constexpr int kBody1 = 13;  // Leading 20.
+  constexpr int kBody2 = 12;  // Leading 20.
+  constexpr int kButton = 12;
+
+#if defined(OS_WIN)
+  constexpr gfx::Font::Weight kButtonWeight = gfx::Font::Weight::BOLD;
+#else
+  constexpr gfx::Font::Weight kButtonWeight = gfx::Font::Weight::MEDIUM;
+#endif
+
+  ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+
+  gfx::FontList headline_font = rb.GetFontListWithDelta(kHeadline - kBase);
+  gfx::FontList title_font = rb.GetFontListWithDelta(kTitle - kBase);
+  gfx::FontList body1_font = rb.GetFontListWithDelta(kBody1 - kBase);
+  gfx::FontList body2_font = rb.GetFontListWithDelta(kBody2 - kBase);
+  gfx::FontList button_font = rb.GetFontListWithDelta(
+      kButton - kBase, gfx::Font::NORMAL, kButtonWeight);
+
+  // The following checks on leading don't need to match the spec. Instead, it
+  // means Label::SetLineHeight() needs to be used to increase it. But what we
+  // are really interested in is the delta between GetFontSize() and GetHeight()
+  // since that (plus a fixed constant) determines how the leading should change
+  // when a larger font is configured in the OS.
+
+  EXPECT_EQ(kHeadline, headline_font.GetFontSize());
+
+// Headline leading not specified (multiline should be rare).
+#if defined(OS_MACOSX)
+  EXPECT_EQ(25, headline_font.GetHeight());
+#elif defined(OS_WIN)
+  EXPECT_EQ(28, headline_font.GetHeight());
+#else
+  EXPECT_EQ(24, headline_font.GetHeight());
+#endif
+
+  EXPECT_EQ(kTitle, title_font.GetFontSize());
+
+// Title font leading should be 22.
+#if defined(OS_MACOSX)
+  EXPECT_EQ(19, title_font.GetHeight());  // i.e. Add 3 to obtain line height.
+#elif defined(OS_WIN)
+  EXPECT_EQ(20, title_font.GetHeight());  // Add 2.
+#else
+  EXPECT_EQ(18, title_font.GetHeight());  // Add 4.
+#endif
+
+  EXPECT_EQ(kBody1, body1_font.GetFontSize());
+
+// Body1 font leading should be 20.
+#if defined(OS_MACOSX)
+  EXPECT_EQ(16, body1_font.GetHeight());  // Add 4.
+#else  // Win and Linux.
+  EXPECT_EQ(17, body1_font.GetHeight());  // Add 3.
+#endif
+
+  EXPECT_EQ(kBody2, body2_font.GetFontSize());
+
+  // Body2 font leading should be 20.
+  EXPECT_EQ(15, body2_font.GetHeight());  // All platforms: Add 5.
+
+  EXPECT_EQ(kButton, button_font.GetFontSize());
+
+  // Button leading not specified (shouldn't be needed: no multiline buttons).
+  EXPECT_EQ(15, button_font.GetHeight());
+}
+
+// Test that the default TypographyProivder correctly maps TextContexts relative

[Peter Kasting, 2017/03/17 02:26:00]

Nit: Provider

[tapted, 2017/03/17 10:33:10]

Done.

+// to the "base" font in the manner that legacy toolkit-views code expects. This
+// reads the base font configuration at runtime, and only tests font sizes, so
+// should be robust against platform changes.
+TEST(LayoutDelegateTest, FontSizeRelativeToBase) {
+  constexpr int kStyle = views::typography::STYLE_PRIMARY;
+
+  // Typography described in chrome_typography.h requires a ChromeViewsDelegate.
+  ChromeViewsDelegate views_delegate;
+
+// Legacy code measures everything relative to a default-constructed FontList.
+// On Mac, subtract one since that is 13pt instead of 12pt.
+#if defined(OS_MACOSX)
+  const int twelve = gfx::FontList().GetFontSize() - 1;
+#else
+  const int twelve = gfx::FontList().GetFontSize();
+#endif
+
+  EXPECT_EQ(twelve, GetFont(CONTEXT_DIALOG_TEXT_SMALL, kStyle).GetFontSize());
+  EXPECT_EQ(
+      twelve,
+      GetFont(views::typography::CONTEXT_CONTROL_LABEL, kStyle).GetFontSize());
+  EXPECT_EQ(twelve,
+            GetFont(views::typography::CONTEXT_FIELD, kStyle).GetFontSize());
+  EXPECT_EQ(
+      twelve,
+      GetFont(views::typography::CONTEXT_BUTTON_TEXT, kStyle).GetFontSize());
+
+#if defined(OS_MACOSX)
+  // We never exposed UI on Mac using these constants so it doesn't matter that
+  // they are different. They only need to match under Harmony.
+  EXPECT_EQ(twelve + 9, GetFont(CONTEXT_HEADLINE, kStyle).GetFontSize());
+  EXPECT_EQ(
+      twelve + 2,
+      GetFont(views::typography::CONTEXT_DIALOG_TITLE, kStyle).GetFontSize());
+  EXPECT_EQ(twelve + 2, GetFont(CONTEXT_DIALOG_MESSAGE, kStyle).GetFontSize());
+  EXPECT_EQ(twelve, GetFont(CONTEXT_DEPRECATED_SMALL, kStyle).GetFontSize());
+#else
+  // E.g. Headline should give a 20pt font.
+  EXPECT_EQ(twelve + 8, GetFont(CONTEXT_HEADLINE, kStyle).GetFontSize());
+  // Titles should be 15pt. Etc.
+  EXPECT_EQ(
+      twelve + 3,
+      GetFont(views::typography::CONTEXT_DIALOG_TITLE, kStyle).GetFontSize());
+  EXPECT_EQ(twelve + 1, GetFont(CONTEXT_DIALOG_MESSAGE, kStyle).GetFontSize());
+  EXPECT_EQ(twelve - 1,
+            GetFont(CONTEXT_DEPRECATED_SMALL, kStyle).GetFontSize());
+#endif
+}