See AccessibleCaretEventHub.h for the class description.
Both TouchCaret and SelectionCarets have their event handling mechanism,
which lead to a lot of code duplication. Now AccessibleCaretEventHub
serves as the single entry point for all events and callbacks.
We also encountered performance issues in SelectionCarets because many
unnecessary events might be dispatched to Gaia driven by the selection
changed events. SelectionCarets did not have clear internal states to
avoid this. To solve it, AccessibleCaretEventHub implements state
classes, and rely on the current states to call the CopyPasteManager's
handler only when it's needed.
For example, when dragging a caret, we do not interest in
NotifySelectionChanged() for updating the carets. Since we've known a
caret is being dragging, we can call UpdateCarets() directly. Hence
DragCaretState does not override OnSelectionChanged().
See AccessibleCaretManager.h for the class description.
AccessibleCaretManager uses two AccessibleCarets to unify the
functionality provided by TouchCaret and SelectionCarets. It has
"cursor" mode and "selection" mode, which corresponds to TouchCaret and
SelectionCarets, respectively.
See AccessibleCaret.h for the class description.
Technical difference between AccessibleCaret and Touch/SelectionCarets:
The anonymous dom element containing a caret image will be created by
AccessibleCaret by using the API landed in bug 1020244 instead of being
created by nsCanvasFrame.
ClampRectToScrollFrames generalizes IsRectVisibleInScrollFrames by
returning the clamped rect in scroll frames. IsRectVisibleInScrollFrames
could be implemented by checking whether the clamped rect is empty or
not.
This patch implements a derived class of gfxPlatformFontList and a set of associated objects that uses fontconfig. It's a replacement for the existing gfxPangoFontGroup and gfxFontconfigUtils code. The fontconfig API is used to lookup all fonts on the system, which are grouped by family name.
Changes due to this patch:
- font style matching, the mapping of style attributes to a specific font, is now handled by the same Gecko code that is used on other plaforms. fontconfig substitutions are handled but fontconfig style matching no longer used.
- downloadable fonts using unicode-range are now supported
- local fullname lookups are only done with the English name of the font, as per the CSS3 Fonts spec, and not only other localized fullnames
- size-specific bitmap fonts are no longer supported
- fonts lacking a Unicode character map are no longer supported
The ref layer comes from the parent process, and hence a different scrollid space. If the scrollid on it's metrics happen to match a scrollbar from the child process we have a problem.
With TemplateContexts keeping the name of the associated template, and the
Gyp context being declared as a TemplateContext, it is now possible to know
the equivalent of IS_GYP_DIR just by looking at the template name.
