This implements the Gtk hooks required to support multi-step input
methods on Linux. This builds on the support for composing regions
(preedit region in Gtk terminology) added to TextInputModel in
https://github.com/flutter/engine/pull/21682.
Specifically, the following changes are included:
1. Add handler for TextInput.setMarkedTextRegion framework messages: On
any change to the EditableText in the framework, this message is sent
which provides an updated rect (in the local co-ordinates of the
EditableText) for the composing region. If not in composing mode, the
cursor rect is sent.
2. Add handler for TextInput.setEditableSizeAndTransform framework messages:
On any change to the RenderObject underlying the EditableText, an
updated size for the full EditableText widget, as well as an affine
transform matrix from local co-ordinates to Flutter root co-ordinates is
sent.
3. On either of the above messages, we use the transformed composing
rect to compute the cursor position in Gtk window co-ordinates and
inform Gtk, so that it can position any system IM composing window
correctly for on-the-spot composing, such as is used when inputting
Japanese text.
4. Adds handlers for preedit-start, preedit-changed, and preedit-end
signals from Gtk. These are passed on to the TextInputModel.
5. Updates the preedit-commit handler to commit the composing region to
the text or, if not composing, insert new text at the cursor.
6. Updates the handler for TextInput.setEditingState framework messages
to extract the composing range base and extent and pass these on to
TextInputModel.
7. Updates update_editing_state function to set composing base and
extent on text input state updates sent to the framework.
Adds a support for compiling flutter engine when
gdk does not have X11 backend. In such a configuration
the generated gdkconfig.h header file looks like the following:
/* gdkconfig.h
*
* This is a generated file. Please modify `configure.ac'
*/
#ifndef __GDKCONFIG_H__
#define __GDKCONFIG_H__
#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
#error "Only <gdk/gdk.h> can be included directly."
#endif
#include <glib.h>
G_BEGIN_DECLS
#define GDK_WINDOWING_WAYLAND
G_END_DECLS
#endif /* __GDKCONFIG_H__ */
Additionally headers like <gdk/gdkx.h> are not available at all.
Above configuration can be found on the most of the embedded systems.
This patch enables compilation of X11 specific code only when gdk
defines GDK_WINDOWING_X11.
Signed-off-by: Damian Wrobel <dwrobel@ertelnet.rybnik.pl>
Fixes the following compilation errors:
../../flutter/shell/platform/linux/fl_platform_plugin.cc:89:7: error: use of undeclared identifier 'strcmp'
if (strcmp(format, kTextPlainFormat) != 0) {
^
../../flutter/shell/platform/linux/fl_platform_plugin.cc:127:7: error: use of undeclared identifier 'strcmp'
if (strcmp(method, kSetClipboardDataMethod) == 0)
^
../../flutter/shell/platform/linux/fl_platform_plugin.cc:129:12: error: use of undeclared identifier 'strcmp'
else if (strcmp(method, kGetClipboardDataMethod) == 0)
^
../../flutter/shell/platform/linux/fl_platform_plugin.cc:131:12: error: use of undeclared identifier 'strcmp'
else if (strcmp(method, kSystemNavigatorPopMethod) == 0)
^
../../flutter/shell/platform/linux/fl_view.cc:194:7: error: use of undeclared identifier 'strcmp'
if (strcmp(pspec->name, "scale-factor") == 0) {
^
../../flutter/shell/platform/linux/fl_engine.cc:67:18: error: use of undeclared identifier 'strrchr'
gchar* match = strrchr(l, '@');
^
../../flutter/shell/platform/linux/fl_engine.cc:75:11: error: use of undeclared identifier 'strrchr'
match = strrchr(l, '.');
^
../../flutter/shell/platform/linux/fl_engine.cc:83:11: error: use of undeclared identifier 'strrchr'
match = strrchr(l, '_');
^
Signed-off-by: Damian Wrobel <dwrobel@ertelnet.rybnik.pl>
Cleans up header order/grouping for consistency: associated header, C/C++ system/standard library headers, library headers, platform-specific #includes.
Adds <cstring> where strlen, memcpy are being used: there are a bunch of places we use them transitively.
Applies linter-required cleanups. Disables linter on one file due to included RapidJson header. See https://github.com/flutter/flutter/issues/65676
This patch does not cover flutter/shell/platform/darwin. There's a separate, slightly more intensive cleanup for those in progress.
