1 files changed, 0 insertions, 214 deletions

diff --git a/chromium/docs/website/site/developers/design-documents/conventions-and-patterns-for-multi-platform-development/index.md b/chromium/docs/website/site/developers/design-documents/conventions-and-patterns-for-multi-platform-development/index.md
deleted file mode 100644
index 4d459efe3c7..00000000000
--- a/chromium/docs/website/site/developers/design-documents/conventions-and-patterns-for-multi-platform-development/index.md
+++ /dev/null
@@ -1,214 +0,0 @@
----
-breadcrumbs:
-- - /developers
-  - For Developers
-- - /developers/design-documents
-  - Design Documents
-page_name: conventions-and-patterns-for-multi-platform-development
-title: Conventions and patterns for multi-platform development
----
-
-Chromium is a large and complex cross-platform product. We try to share as much
-code as possible between platforms, while implementing the UI and OS integration
-in the most appropriate way for each. While this gives a better user experience,
-it adds extra complexity to the code. This document describes the recommended
-practices for keeping such cross-platform code clean.
-
-We use a variety of different file naming suffixes to indicate when a file
-should be used:
-
-*   Mac files use the _mac suffix for lower-level files and Cocoa (Mac
-            UI) files use the _cocoa suffix.
-*   iOS files use the _ios suffix (although iOS also uses some specific
-            _mac files).
-*   Linux files use _linux suffix for lower-level files, _gtk for
-            GTK-specific files, and _x for X Windows (with no GTK) specific
-            files.
-*   Windows files use the _win suffix.
-*   Posix files shared between Mac, iOS, and Linux use the _posix
-            suffix.
-*   Files for Chrome's "Views" UI (on Windows and experimental GTK)
-            layout system use the _views suffix.
-
-The separate front-ends of the browser are contained in their own directories:
-
-*   Mac Cocoa: chrome/browser/ui/cocoa
-*   Linux GTK: chrome/browser/ui/gtk
-*   Windows Views (and the experimental GTK-views):
-            chrome/browser/ui/views
-
-The [Coding Style](/developers/coding-style) page lists some stylistic rules
-affecting platform-specific defines.
-
-### How to separate platform-specific code
-
-#### Small platform differences: #ifdefs
-
-When you have a class with many shared functions or data members, but a few
-differences, use #ifdefs around the platform-specific parts. If there are no
-significant differences, it's easier for everybody to keep everything in one
-place.
-
-#### Small platform differences in the header, larger ones in the implementation: split the implementation
-
-There may be cases where there are few header file differences, but significant
-implementation differences for parts of the implementation. For example,
-base/waitable_event.h defines a common API with a couple of platform
-differences.
-
-With significant implementation differences, the implementation files can be
-split. The prevents you from having to do a lot of #ifdefs for the includes
-necessary for each platform and also makes it easier to follow (three versions
-each of a set of functions in a file can get confusing). There can be different
-.cc files for each platform, as in base/waitable_event_posix.cc that implements
-posix-specific functions. If there were cross-platform functions in this class,
-they would be put in a file called base/waitable_event.cc.
-
-#### Complete platform implementations and callers: separate implementations
-
-When virtually none of the implementation is shared, implement the class
-separately for each platform in separate files.
-
-If all implementations are in a cross-platform directory such as base, they
-should be named with the platform name, such as FooBarWin in base/foo_bar_win.h.
-This case will generally be rare since files in these cross-platform files are
-normally designed to be used by cross-platform code, and separate header files
-makes this impossible. In some places we've defined a commonly named class in
-different files, so PlatformDevice is defined in skia/ext/platform_device_win.h,
-skia/ext/platform_device_linux.h, and skia/ext/platform_device_mac.h. This is OK
-if you really need to refer to this class in cross-platform code. But generally,
-cases like this will fall into the following rule.
-
-If the implementations live in platform-specific directories such as
-chrome/browser/ui/cocoa or chrome/browser/ui/views, there is no chance that the
-class will be used by cross-platform code. In this case, the classes and
-filenames should omit the platform name since it would be redundant. So you
-would have FooBar implemented in chrome/browser/ui/cocoa/foo_bar.h.
-
-Don't create different classes with different names for each platform and
-typedef it to a shared name. We used to have this for PlatformCanvas, where it
-was a typedef of PlatformCanvasMac, PlatformCanvasLinux, or PlatformCanvasWin
-depending on the platform. This makes it impossible to forward-declare the
-class, which is an important tool for reducing dependencies.
-
-### When to use virtual interfaces
-
-In general, virtual interfaces and factories should not be used for the sole
-purpose of separating platform differences. Instead, it should be be used to
-separate interfaces from implementations to make the code better designed. This
-comes up mostly when implementing the view as separate from the model, as in
-TabContentsView or RenderWidgetHostView. In these cases, it's desirable for the
-model not to depend on implementation details of the view. In many cases, there
-will only be one implementation of the view for each platform, but gives cleaner
-separation and more flexibility in the future.
-
-In some places like TabContentsView, the virtual interface has non-virtual
-functions that do things shared between platforms. Avoid this. If the code is
-always the same regardless of the view, it probably shouldn't be in the view in
-the first place.
-
-### Implementing platform-specific UI
-
-In general, construct platform specific user interface elements from other
-platform-specific user interface elements. For instance, the views-specific
-class BrowserView is responsible for constructing many of the browser dialog
-boxes. The alternative is to wrap the UI element in a platform-independent
-interface and construct it from a model via a factory. This is significantly
-less desirable as it confuses ownership: in most cases of construction by
-factory, the UI element returned ends up being owned by the model that created
-it. However in many cases the UI element is most easily managed by the UI
-framework to which it belongs. For example, a views::View is owned by its view
-hierarchy and is automatically deleted when its containing window is destroyed.
-If you have a dialog box views::View that implements a platform independent
-interface that is then owned by another object, the views::View instance now
-needs to explicitly tell its view hierarchy not to try and manage its lifetime.
-
-e.g. prefer this:
-
-> // browser.cc:
-> Browser::ExecuteCommand(..) {
-> ...
-> case IDC_COMMAND_EDIT_FOO:
-> window()->ShowFooDialog();
-> break;
-> ...
-> }
-> // browser_window.h:
-> class BrowserWindow {
-> ...
-> virtual void ShowFooDialog() = 0;
-> ...
-> };
-> // browser_view.cc:
-> BrowserView::ShowFooDialog() {
-> views::Widget::CreateWindow(new FooDialogView)->Show();
-> }
-> // foo_dialog_view.cc:
-> // FooDialogView and FooDialogController are automatically cleaned up when the
-> window is closed.
-> class FooDialogView : public views::View {
-> ...
-> private:
-> scoped_ptr<FooDialogController> controller_; // Cross-platform
-> state/control logic
-> ...
-> }
-
-to this:
-
-> // browser.cc:
-> Browser::ExecuteCommand(..) {
-> ...
-> case IDC_COMMAND_EDIT_FOO: {
-> FooDialogController::instance()->ShowUI();
-> break;
-> }
-> ...
-> }
-> // foo_dialog_controller.h:
-> class FooDialog {
-> public:
-> static FooDialog\* CreateFooDialog(FooDialogController\* controller);
-> virtual void Show() = 0;
-> virtual void Bar() = 0;
-> };
-> class FooDialogController {
-> public:
-> ...
-> static FooDialogController\* instance() {
-> static FooDialogController\* instance = NULL;
-> if (!instance)
-> instance = Singleton<FooDialogController>::get();
-> return instance;
-> }
-> ...
-> private:
-> ...
-> void ShowUI() {
-> if (!dialog_.get())
-> dialog_.reset(FooDialog::CreateFooDialog(this));
-> dialog_->Show();
-> }
-> // Why bother keeping FooDialog or even FooDialogController around?
-> // Most dialogs are very seldom used.
-> scoped_ptr<FooDialog> dialog_;
-> };
-> // foo_dialog_win.cc:
-> class FooDialogView : public views::View,
-> public FooDialogController {
-> public:
-> ...
-> explicit FooDialogView(FooDialogController\* controller) {
-> set_parent_owned(false); // Now necessary due to scoped_ptr in
-> FooDialogController.
-> }
-> ...
-> };
-> FooDialog\* FooDialog::CreateFooDialog(FooDialogController\* controller) {
-> return new FooDialogView(controller);
-> }
-
-Sometimes this latter pattern is necessary, but these occasions are rare, and
-very well understood by the frontend team. When porting, consider converting
-cases of the latter model to the former model if the UI element is something
-simple like a dialog box.
\ No newline at end of file