Non gesture controllers have no means to collaborate with other
controllers, thus should be considered standalone entities. It makes
no sense to propagate any further if scroll/key controllers handled
the event.
This is a GtkGesture done to deal with stylus events from drawing tablets.
Those have a special number of characteristics that extend a regular
pointer, so it makes sense to wrap that.
This may result on the later emission of crossing events, with one of the
sides being already unmapped/unrealized. The widget being unmapped will
result on repick and emission of a set of crossing events anyway.
This event controller is meant to replace usage from key-press/release-event
handlers all through. Optionally it can be set a GtkIMContext, so interaction
is carried by the controller.
1. Pass clip rectangles to gtk_snapshot_push_state() that point into
the state array.
2. g_array_set_size(len+1) the state array
3. Make that function realloc() the state array.
4. The clip rectangle now points into invalid memory
5. Use the clip array
This patch fixes things by moving step 5 to before step 2.
1b9aa1b708 ('a11y: drop the focus tracker') removed a bit too much. We
still have to emit window:activate/deactivate events. They are easy to
emit anyway.
Fixes#127
Overlays are drawings that get rendered on top of the inspected window.
The only overlay in existence so far is the highlight overlay, which is
used to highlight widgets and replaces the "draw" signal handler used
previously.
Instead of just notifying the inspector of what is going to be rendered,
allow the inspector to modify it.
This way, the inspector can overlay information it deems relevant over
the render node while still having access to what the actual widget
(without the inspector) would paint.
If you want to draw a widget to cairo today, you create a widget
paintable, snapshot it to a render node and then draw the render node to
cairo.
And yes, this is that complicated on purpose. Don't draw widgets to
Cairo.
This allows being more specific about the size.
It's useful in particular when the resulting render nodes might be
too small for the size, not only when they are too large. For the
latter case, using a clip node would be enough.
It also requires adding a clip node when rendering the resulting
paintable, but that should be optimized out by GtkSnapshot when not
necessary.
This is actually not just a mechnaism to protect against too many
signals, but it's also a method to getting those signals at the wrong
time.
For every size/content change, a widget needs to invalidate twice:
Once when it queues a resize/redraw (going valid => invalid) and once
when the new size/content is actually assigned (going invalid => valid).
However, one of those invalidations might be inconvenient for the
listener. GtkImage for example does not like receiving
invalidate-contents signals when new contents are assigned, but is fine
with them when the old ones go invalid. And it will not try to draw the
paintable in between anyway.
So by bypassing the 2nd emission if nothing was changed, we can make
GtkImage happy.
When the clip changes that is passed to a snapshot function, we need to
create eventual cached render nodes because they might not have drawn
their whole area before.
Fixes issues with redrawing when scrolling.
