Prior to this patch, we were pushing two frames each time the cursor blinked.
In turning the cursor on or off, the markNeedsPaint call was triggering another
frame to be scheduled because we cleared a bit in the scheduler at the
beginning of the frame instead of at the end of the frame.
To implement scheduling correctly, we actually need two bits: one for
ensureVisualUpdate, which just promises to get to the end of the pipeline soon,
and scheduleFrame, which promises to get to the beginning of the pipeline soon.
Also a bit of code cleanup.
The key part of this patch is the addition in `_endScroll` to reset
`_simulation`. It seems like this was the one place where it's possible
for us to end the animation but not reset our state. Since we assert
that are state is coherent, we were hitting asserts when a fling
finished and then you interacted with the widget again.
The 'routes' table is a point of confusion with new developers. By
providing a 'home' argument that sets the '/' route, we can delay the
point at which we teach developers about 'routes' until the point where
they want to have a second route.
This makes it easier to use e.g. AssetImage in simple test applications.
Also, dartdoc improvements.
Also, use @required in one place, to see if it causes any trouble. If it
doesn't, I'll start using it in more places.
The defaulting logic for bundles really belongs in the services layer,
not the widgets layer. This way we can tell non-widget code just to use
rootBundle if it just wants to read a JSON file or some such.
Bindings now have a debugRegisterServiceExtensions() method that is
invoked in debug mode (only). (Once we have a profile mode, there'll be
a registerProfileServiceExtensions() method that gets called in that
mode only to register extensions that apply then.)
The BindingBase class provides convenience methods for registering
service extensions that do the equivalent of:
```dart
void extension() { ... }
bool extension([bool enabled]) { ... }
double extension([double extension]) { ... }
Map<String, String> extension([Map<String, String> parameters]) { ... }
```
The BindingBase class also itself registers ext.flutter.reassemble,
which it has call a function on the binding called
reassembleApplication().
The Scheduler binding now exposes the preexisting
ext.flutter.timeDilation.
The Renderer binding now exposes the preexisting ext.flutter.debugPaint.
The Renderer binding hooks reassembleApplication to trigger the
rendering tree to be reprocessed (in particular, to fix up the
optimisation closures).
All the logic from rendering/debug.dart about service extensions is
replaced by the above.
I moved basic_types to foundation.
The FlutterWidgets binding hooks reassembleApplication to trigger the
widget tree to be entirely rebuilt.
Flutter Driver now uses ext.flutter.driver instead of
ext.flutter_driver, and is hooked using the same binding mechanism.
Eventually we'll probably move the logic into the Flutter library so
that you just get it without having to invoke a special method first.
To be more consistent with other parts of the platform:
* put the binding in a binding.dart file.
* rearrange some members of the Scheduler class to be more close to
execution order.
* factor out Priority class into its own file.
* add more dart docs.
+ Add new demo to gallery to show data tables. (This currently doesn't
use a Card; I'll create a Card version in a subsequent patch.)
+ Fix checkbox alignment. It now centers in its box regardless.
+ Add Colors.black54.
+ Some minor fixes to dartdocs.
+ DataTable, DataColumn, DataRow, DataCell
+ RowInkWell
+ Augment dartdocs of materia/debug.dart.
+ DropDownButtonHideUnderline to hide the underline in a drop-down when
used in a DataTable.
+ Add new capabilities to InkResponse to support RowInkWell.
+ Augment dartdocs of materia/material.dart.
+ Add an assert to catch nested Blocks.
+ Fix a crash in RenderBox when you remove an object and an ancestor
used its baseline. (https://github.com/flutter/flutter/issues/2874)
+ Fix (and redocument) RenderBaseline/Baseline.
+ Add flex support to IntrinsicColumnWidth.
+ Document more stuff on the RenderTable side.
+ Fix a bug with parentData handling on RenderTable children.
+ Completely rewrite the column width computations. The old logic made
no sense at all.
+ Add dartdocs to widgets/debug.dart.
+ Add a toString for TableRow.
If two repaint boundaries mark themselves dirty, but the second one is a
child of the first, then the second one will get repainted by the first
and then when we come to paint it directly, we get confused because it
isn't dirty any more.
We ran into this in layout before. Apply the same fix. Also, apply the
same fix to composition while we're at it.
