Comment #9 on issue 14562 by tha...@chromium.org: Support Cmd-E as shortcut
for finding selection
http://code.google.com/p/chromium/issues/detail?id=14562
So, did some looking how cmd-c works:
Cmd-c is not bound to `commandDispatch:` on OS X but instead directly to
`copy:` (see `MainMenu.xib`). This is implemented in
`chrome/browser/tab_contents/tab_contents_view_mac.mm` by
`TabContentsViewCocoa` and just delegates to `TabContents::Copy()`, which in
turn delegates to `RenderViewHost::Copy()`. This send a `ViewMsg_Copy` to
the
renderer.
This message is then routed to `RenderView::OnCopy()` in the renderer, which
`executeCommand()`s `"Copy"` on the webview's focussed frame.
The map from command names to actions is in
`third_party/WebKit/WebCore/editing/EditorCommand.cpp`. The command reaches
`.../WebCore/editing/Editor.cpp::copy()`, which calls
`Pasteboard::generalPasteboard()->writeSelection()` (or `writeImage()`).
In our case, that ends up being
`.../WebCore/platform/PasteboardChromium.cpp`,
which calls `ChromiumBridge::clipboardWriteSelection()` (for the text case).
The implementation is in the forked part of webkit ('webkit/api/src`) again.
This calls `WebClipboardImpl::WriteHTML()`, which puts the text into a
`ScopedClipboardWriterGlue`. Then
`chrome/renderer/renderer_glue.cc::~ScopedClipboardWriterGlue()` sends
`ViewHostMsg_ClipboardWriteObjectsAsync` to the browser process.
The browser process `OnClipboardWriteObjects()` in
`chrome/browser/resource_message_filter.cc` is called when the ipc message
`ViewHostMsg_ClipboardWriteObjectsAsync` arrives.
This calls `WriteObjects()` on a `base/clipboard.h` `Clipboard` (through
`ScopedClipboardWriter`). Finally, `base/clipboard_mac.mm` does the writing
to
the clipboard.
Cmd-e should work exactly the same but write into a different pasteboard at
the end.
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