[ios] Use UIStackView to simplify web_view_shell layout code

By making |headerBackgroundView| and |headerContentView| UIStackView
instances, we can let UIStackView figure out a lot of the constraints on
its own and simplify the code significantly:

* |headerBackgroundView| is a 1-item UIStackView that just contains
  |headerContentView|. It inherits the root view's margins so that
  |headerContentView| is laid out respecting the safe area and the
  layout guide margins.

* |headerContentView| is a horizontal UIStackView containing the
  navigation buttons and the location bar. The items are vertically
  centralized and fill the UIStackView horizontally according to the
  content hugging settings (i.e. the location bar expands horizontally,
  the buttons do not).

By comparing screenshots of before and after with //tools/image_diff,
the only difference is a small change to the location bar in height, as
it no longer has a hardcoded size of 32 points.

Change-Id: I9f27dd1e4e60b59b2ac1844c0ae965dad17f9fc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6176975
Auto-Submit: Raphael Kubo da Costa <kubo@igalia.com>
Reviewed-by: John Wu <jzw@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1407650}
1 file changed
tree: 0594c14def15560915c02f193176390314f47ead
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

Logo Chromium

Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all users to experience the web.

The project's web site is https://www.chromium.org.

To check out the source code locally, don't use git clone! Instead, follow the instructions on how to get the code.

Documentation in the source is rooted in docs/README.md.

Learn how to Get Around the Chromium Source Code Directory Structure.

For historical reasons, there are some small top level directories. Now the guidance is that new top level directories are for product (e.g. Chrome, Android WebView, Ash). Even if these products have multiple executables, the code should be in subdirectories of the product.

If you found a bug, please file it at https://crbug.com/new.