Rendering text inside an actor is pretty much impossible without
using internal API to create the various pieces like the PangoContext
and the font map.
Each actor should have the ability to create a PangoContext, which
is the only object needed to generate layouts and change the various
Pango settings.
This commit adds a clutter_actor_get_pango_context() function that
creates a PangoContext inside the ClutterActor private data and allows
the creation of PangoLayouts when needed. If the actor already
has a PangoContext, the same instance is returned.
The PangoContext is created only on demand.
The ClutterBackend instance at the moment lacks the ability to
notify runtime changes of the font options and the resolution.
For this reason, this commit adds a ::resolution-changed and a
::font-changed signals to the Backend class.
The ::resolution-changed signal is emitted when set_resolution()
is called with a different DPI; ::font-changed is emitted when the
cairo_font_options_t* changes from the default.
This follows the convention of GtkLabel/GtkEntry in GTK+ and the old
ClutterEntry.
It makes it easier to use strlen/strcmp etc on the output, since we can
assume that it is always a string.
This commit also updates the test unit for ClutterText to verify that
the clutter_text_get_text() function also returns an empty string when
a ClutterText actor has been created.
The clutter-private.h header already includes cogl-pango.h with
the correct inclusion path, because the main context stores a
pointer to the font map.
There is no need for clutter-text.c to include cogl-pango.h
again since it already includes clutter-private.h.
After fixing the cursor position issues around the initial
glyph of the layout, the selection position needs fixing as
well.
The fix is similar: check if the position of the selection
is 0 and provide a fast path by setting the offset to 0.
The clutter_text_set_selection() function is a convenience
method for setting the cursor position and the selection
boundary to a given position in a single call, with sanity
checks for the positions.
The clutter_text_get_selection() function was not checking the
passed argument, and was still accessing the contents of the
Text actor using clutter_text_get_text().
This commit also adds the last few gtk-doc annotations missing
from ClutterText.
Instead of repeating the same code for the ::activate signal
emission, use the clutter_text_activate() function inside the
'activate' key binding handler.
The clutter_text_activate() function will emit the ::activate
signal if the :activatable property is set.
This function is useful for subclasses or application code, for
example if we are going to use ::captured-event or ::key-press-event
signal handlers to intercept the Return key and emit the ::activate
signal ourselves.
Instead of installing the line-start and line-end key bindings
using the bare ClutterBindingPool API, we can use the internal
clutter_text_add_move_binding(), which automatically installs
the same key binding with the Shift modifier mask.
This allows selecting when pressing Shift+Home or Shift+End.
The selection behaviour is still incorrect around the zeroeth
position, with all the text after the first line being selected.
We can control the width of the cursor when painting by using
a simple property.
The magic -1 number passed to the setter method will reset the
cursor size to the default one of 2px.
The getter method will return an unsigned integer with the
current size.
Moving the text by a "page" depends on being able to define a
"page size" in terms of lines of text. Since we don't define
something similar to an Adjustment that allows us to handle this
behaviour, we should defer the paging implementation to a higher
level class based on ClutterText.
Another fix for the key navigation behaviour around the zeroeth
glyph in the layout.
This commit adds a fast path for for the zero index when the
cursor position is set as zero, in case we are using the line-start
or line-end key bindings, similarly to what we did in commit
be64cbcdc2 for the move-up and
move-down bindings.
The behaviour of ClutterText around the initial position is still
a little bit erratic.
This commit fixes the key navigation with Up and Down arrows around
the first line of text.
We loose precision with a direct conversion for PangoUnits to
pixels, so we should do the conversion as needed, inside the
callers of clutter_text_position_to_coords().
We don't allow changing the cursor geometry inside the ::cursor-event
signal handlers; for starters, it would make binding the signal a
huge mess, and it would also potentially break the whole actor.
If we create the PangoContext for ClutterText inside the class
initialization we might not have a Clutter main context yet.
Ideally, we should store the Pango context inside the main context
and create it on clutter_init(), but for now we can lazily create
the PangoContext when we initialize a ClutterText instance for the
first time.
For the time being, just don't include them or compile them; the
files will be removed from the repository as soon as all the
documentation annotations have been ported over to ClutterText.
We allow KeyEvents with a key symbol of '0' to fall through only
if they are marked as synthetic. Otherwise we discard them without
mercy.
Synthetic events are useful to test ClutterText behaviour; in fact,
we do use them inside the test suite exactly for that reason.
I understand we are not Pascal developers, and we don't have to
use cute and cuddly names like "i_am_an_integer_counter", but
a ClutterButtonEvent should be stored inside an "event" variable.
Using "bev" instead? Mmmh, not so much.
ClutterText should use the paint opacity for both text and
cursor.
ClutterLabel had the wrong behaviour, as it set the actor's
opacity using the text color's alpha channel, and ClutterEntry
completely disregarded the actor's opacity when painting the
cursor.
This commit harmonizes the ClutterText behaviour to always
use a composition of the actor's paint opacity and the text
and cursor alpha channel values, thus behaving more
consistently with the rest of Clutter.
When inserting text on a key press event we should also truncate
the selection.
We should not truncate the selection when inserting any Unicode
character, since changing the selection also changes the cursor
position - and one of the invariants we inherited from ClutterEntry
is that inserting characters programmatically does not change the
cursor position.
If a selection has been truncated inside a key binding handler,
we should just return and let the usual key event handler continue.
This fixes the case where we deleted a selection using the Delete
or the Backspace keys.
ClutterText should use the newly added ClutterBindingPool API to
handle key events, instead of its homegrown code.
This commit removes the action/mapping code and defers the entire
key binding matching to a ClutterBindingPool created inside the
Text class initialization function.
The clutter_text_get_chars() function returns a section of the
contents of the Text actor, delimited by a start and an end position.
This commit adds the implementation for that function and a test
unit that guarantees the offset-to-bytes computations are correct.
The :cursor-color-set property is a read-only property that
reflects whether the ClutterText actor is going to use the
color set inside the :cursor-color property when painting
the cursor.
We should re-use the offset_to_bytes() implementation from ClutterEntry
as it guaranteed some behaviour and sanity checks that we want to keep
inside ClutterText.
A ClutterText can be put in "password mode" by setting the
text as "invisible": every character inside the Text actor's
contents will be replaced when building the Pango layout with
a specific Unicode character.
The Unicode character is set to '*' by default, but the user
can be changed using the provided API.
