This change removes the extra frame scheduled when events was delivered
during a frame. This extra frame was intended to paper over state changes
that happen later than the layout depending on it.
However, it is better for programs to never allow such state change skew,
and recent changes allows them to refresh and query state before layout.
This is an API change because programs may rely on the extra frames.
Those programs should ensure that state is updated before relying on it
in layout.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
The double-negative DisabledOp is harder to understand than a
straightforward EnabledOp. Note that the absence of an EnabledOp
implies still means that the widget is enabled.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
When storing a string in an interface value that escapes, Go has to heap
allocate space for the string header, as interface values can only store
pointers. In text-heavy applications, this can lead to hundreds of
allocations per frame due to semantic.LabelOp, the primary user of
string-typed references in ops.
Instead of allocating each string header individually, provide a slice
of strings to store string-typed references in, and store pointers into
this slice as the actual references. This only allocates when resizing
the slice's backing array, and averages out to no allocations, as the
backing array gets reused between calls to Ops.Reset.
We introduce two new functions, Write1String and Write2String, which
make use of this new slice for their last argument. We could've
automated this in the existing Write1 and Write2 methods, but that would
require type assertions on each call, and the vast majority of ops do
not make use of strings.
Signed-off-by: Dominik Honnef <dominik@honnef.co>
This commit updates the logic behind SemanticAt to use the same hit area
traversal as normal event routing, which should result in more accurate
results for screen readers trying to resolve widgets that might be partially
obscured by non-semantic content.
While here, I realized that the iteration of hit areas needed to stop at
the first matching semantic area, and I added that capability and updated
the ActionAt logic to leverage it as well.
Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
When running ActionAt, the router used to only consider the topmost clip area, even
if that clip area had no input handlers attached whatsoever. This change updates the
logic for that test to use the same traversal as normal event handling, ensuring that
action inputs behave intuitively like any other pointer input area. Included is a test
catching the problematic behavior that prompted this change.
Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
Putting a string in an interface value has to (normally) heap allocate
the string header and string. However, putting the address of a local
string variable in an interface value has the same effect, as this
causes the local variable to escape to the heap.
Signed-off-by: Dominik Honnef <dominik@honnef.co>
Before this change, inverse transformations of pointer positions would
stack up, leading to incorrect positions when an enter or leave event
was delivered to multiple areas.
Signed-off-by: Dominik Honnef <dominik@honnef.co>
This reverts commit cd0c9dab9f. It turns out
that Enter/Leave is important for cancelling press-then-release-outside
for clickables.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
When a key.InputOp is focused, a key.Event is matched to it and its ancestors.
If there is no focus, every handler is matched.
This change always matches to every handler, after checking the focus and
its ancestors.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
The app.Window.Perform(ActionMove) is the wrong abstraction for
initiating a move gesture: Windows needs to know the move gesture
area at pointer move, and macOS needs to know the pointer button
down event that triggers the move gesture. This change replaces
Perform(ActionMove) with a new system.ActionInputOp that marks an
area movable.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
When a key.InputOp is focused, keypresses that it does not explicitly
include in its key set should check for ancestor clip areas that are
interested in them. Previously this check only included ancestors of
the final clip area in the hit tree, and could fail to find ancestors
of the focused key.InputOp because they were in a different branch.
This commit also adds a test to lock in the new behavior.
This can likely be made more efficient by adding a rapid way to map
from the focused key tag to its index in the hit tree. I wasn't sure
whether the complexity was warranted, but I'm happy to do that if
it's desired.
Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
There are no public API that uses f32.Rectangle anymore. Move Rectangle
to an internal package for internal use.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Like the change to op.Offset before this, clip.RRect and UniformRRect
is usually used with integer coordinates. Change to integer coordinates
to eliminate many useless conversions to float32.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
If the currently focused handler don't want the key event, try every
other handler, from top to bottom. This change requires widgets to
only react when focused.
Fixes: https://todo.sr.ht/~eliasnaur/gio/406
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Instead of cmpletely replacing the IME snippet for every update, expand
the old range if there is overlap. This change avoids never-ending
restarts of the IME on Android where snippets are expanded in two
calls, one for expanding before the selection and one for exanding after
the selection.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Before this change, every Event would be passed to the focused InputOp
tag, making it impossible to implement, say, program-wide shortcuts.
This change implements key.Event routing similar to how pointer.Events
are routed: every InputOp describes the set of keys it can handle, and
the router use that information to deliver an Event to the matching
handler.
This is an API change, because every InputOp must now include a filter
matching the keys it wants to handle.
Fixes: https://todo.sr.ht/~eliasnaur/gio/395
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Before this change, synthetic events such as scrolling caused by
focus movement would use semantic information to determine potential
receivers. However, there can only be one handler per area so sibling
handlers would not be considered. This change makes the event delivery
traverse the entire tree of handlers, including siblings.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
List was recently changed to include an extra child at each end, to
automatically scroll when reaching the end of a focus direction. However,
if List includes unfocusable children that strategy may fail. This change
adds another fallback where app.Window will scroll a constant amount in
the focus direction, to reveal more children.
For https://github.com/tailscale/tailscale/issues/4278.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Enter/Leave events make sense for mouse pointers, to track hover
status. It doesn't make sense to track hover for touch input, so
this change stops pointer.Enter and pointer.Leave from being
emitted for pointer.Touch sources.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Before this change, semantic clicks would be delivered according to
the center of the targeted widget, which could result in a different
widget receiving the click. Or in worst case, no widget in case the
center is not visible because of clipping.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
A focused widget may be partially or completely off-screen in which case
the user will have difficulty interacting with it. This change attempts to
scroll the focused widget into view by issuing synthetic scroll events.
For https://github.com/tailscale/tailscale/issues/4278, but doesn't completely
solve it because layout.Lists won't layout focusable widgets outside its visible
bounds. A follow-up change deals with that.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
This is a refactor to make it easier to add higher level logic to
focus moves. A follow-up will add automatic scrolling to bring
focused widgets into view.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
It's now possible to directly user pointer.Cursor to add to the ops.
pointer.CursorText.Add(gtx.Ops)
This is an API change. Use pointer.Cursor directly instead of CursorNameOp.
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
Add most of the common cursors defined by different systems.
Normalize cursor names to match CSS.
This is API change: some cursor names have changed, and the
underlying type is no longer a string.
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
Mapping it to key.NameReturn confuses widgets such as Editor that
treats clicks separate from return key presses.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
This change implements reporting of the caret position from Editor, as well
as Windows, macOS, Android support. As a result, the IME composition window
on Windows and macOS is now positioned correctly.
References: https://todo.sr.ht/~eliasnaur/gio/246
Signed-off-by: Elias Naur <mail@eliasnaur.com>
In commit 929e4dc12, the rules to send pointer.{Enter,Leave}
events were relaxed. Unfortunately, to be able to make use
of them was not straight forward as it required the transfer
target op to use the same handle as the hover one.
This patch eases this by allowing any handle for the target
as well as not requiring the hover op to be defined on the same
clip op as the target (then requiring a PassOp though), making
it much easier to use.
Also added a test for pointer.Enter events not being generated
if the target type does not match the source one.
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
When a drag and drop gesture is ongoing, let the potential target
handlers receive enter/leave events so that they can react to them (e.g.
highlight themselves when the dragged item is over them).
Fixes#321.
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
When computing the set of Enter/Leave events to be
delivered to handlers, skip non mouse pointers
right away instead of processing hit events.
Also, remove use of pointer to slice use in opHit.
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
This patch adds internal Drag and Drop support to app.Windows.
The new package io/transfer adds the ability to
define draggable and droppable targets, which
are leveraged by the new widget.Draggable type.
The API is generic and could handle future use
cases, such as external Drag and Drop.
Updates gio#153
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
Software such as screen readers require semantic descriptions of user
interfaces to effectively present and interact with them. Package
semantic, combined with the existing package clip provide the operations
for Gio programs to describe themselves.
This change implements the semantic package and the routing changes for
accessing semantic trees; follow-ups add semantic information to widgets
and implement mapping semantic tree to platform representations.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Elias Naur