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gtk: Add GtkPadController

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This GdkEventController is a helper object to handle pad events,
it allows setting a mapping to action names, to be triggered in
the given action group.

In order to help on places where advanced mapping/configurability
of pad features is not desirable, this controller also allows
passing a NULL pad device, meaning it will listen on all pads,
and/or passing -1 on mode/index, so an action applies to all
modes/features (eg. strips/rings).

https://bugzilla.gnome.org/show_bug.cgi?id=770026
This commit is contained in:
Carlos Garnacho 2016-08-04 19:22:34 +02:00
parent 3a6d0ff2ab
commit a0b9586465
7 changed files with 594 additions and 1 deletions
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3
docs/reference/gtk/gtk-docs.sgml
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@ -299,7 +299,7 @@
</chapter>
<chapter id="Gestures">
<title>Gestures</title>
<title>Gestures and event handling</title>
<xi:include href="xml/gtkeventcontroller.xml" />
<xi:include href="xml/gtkgesture.xml" />
<xi:include href="xml/gtkgesturesingle.xml" />
@ -310,6 +310,7 @@
<xi:include href="xml/gtkgestureswipe.xml" />
<xi:include href="xml/gtkgesturerotate.xml" />
<xi:include href="xml/gtkgesturezoom.xml" />
<xi:include href="xml/gtkpadcontroller.xml" />
</chapter>
<chapter id="DeprecatedObjects">

22
docs/reference/gtk/gtk3-sections.txt
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@ -8450,6 +8450,28 @@ GTK_GESTURE_ZOOM_GET_CLASS
gtk_gesture_zoom_get_type
</SECTION>
<SECTION>
<FILE>gtkpadcontroller</FILE>
<TITLE>GtkPadController</TITLE>
GtkPadController
gtk_pad_controller_new
gtk_pad_controller_set_action_entries
gtk_pad_controller_set_action
GtkPadActionType
GtkPadActionEntry
<SUBSECTION Standard>
GTK_TYPE_PAD_CONTROLLER
GTK_PAD_CONTROLLER
GTK_PAD_CONTROLLER_CLASS
GTK_IS_PAD_CONTROLLER
GTK_IS_PAD_CONTROLLER_CLASS
GTK_PAD_CONTROLLER_GET_CLASS
<SUBSECTION Private>
gtk_pad_controller_get_type
</SECTION>
<SECTION>
<FILE>gtkstacksidebar</FILE>
GtkStackSidebar

1
docs/reference/gtk/gtk3.types.in
View File

@ -133,6 +133,7 @@ gtk_numerable_icon_get_type
gtk_offscreen_window_get_type
gtk_orientable_get_type
gtk_overlay_get_type
gtk_pad_controller_get_type
gtk_page_setup_get_type
@DISABLE_ON_W32@gtk_page_setup_unix_dialog_get_type
gtk_paned_get_type

2
gtk/Makefile.am
View File

@ -250,6 +250,7 @@ gtk_public_h_sources = \
gtkoffscreenwindow.h \
gtkorientable.h \
gtkoverlay.h \
gtkpadcontroller.h \
gtkpagesetup.h \
gtkpaned.h \
gtkpapersize.h \
@ -829,6 +830,7 @@ gtk_base_c_sources = \
gtkoffscreenwindow.c \
gtkorientable.c \
gtkoverlay.c \
gtkpadcontroller.c \
gtkpagesetup.c \
gtkpaned.c \
gtkpango.c \

1
gtk/gtk.h
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@ -152,6 +152,7 @@
#include <gtk/gtkoffscreenwindow.h>
#include <gtk/gtkorientable.h>
#include <gtk/gtkoverlay.h>
#include <gtk/gtkpadcontroller.h>
#include <gtk/gtkpagesetup.h>
#include <gtk/gtkpapersize.h>
#include <gtk/gtkpaned.h>

467
gtk/gtkpadcontroller.c Normal file
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@ -0,0 +1,467 @@
/* GTK - The GIMP Toolkit
* Copyright (C) 2016, Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Author(s): Carlos Garnacho <carlosg@gnome.org>
*/
/**
* SECTION:gtkpadcontroller
* @Short_description: Controller for drawing tablet pads
* @Title: GtkPadController
* @See_also: #GtkEventController, #GdkDevicePad
*
* #GtkPadController is an event controller for the pads found in drawing
* tablets (The collection of buttons and tactile sensors often found around
* the stylus-sensitive area).
*
* These buttons and sensors have no implicit meaning, and by default they
* perform no action, this event controller is provided to map those to
* #GAction objects, thus letting the application give those a more semantic
* meaning.
*
* Buttons and sensors are not constrained to triggering a single action, some
* %GDK_SOURCE_TABLET_PAD devices feature multiple "modes", all these input
* elements have one current mode, which may determine the final action
* being triggered. Pad devices often divide buttons and sensors into groups,
* all elements in a group share the same current mode, but different groups
* may have different modes. See gdk_device_pad_get_n_groups() and
* gdk_device_pad_get_group_n_modes().
*
* Each of the actions that a given button/strip/ring performs for a given
* mode is defined by #GtkPadActionEntry, it contains an action name that
* will be looked up in the given #GActionGroup and activated whenever the
* specified input element and mode are triggered.
*
* A simple example of #GtkPadController usage, assigning button 1 in all
* modes and pad devices to an "invert-selection" action:
* |[
* GtkPadActionEntry *pad_actions[] = {
* { GTK_PAD_ACTION_BUTTON, 1, -1, "Invert selection", "pad-actions.invert-selection" },
* …
* };
*
* …
* action_group = g_simple_action_group_new ();
* action = g_simple_action_new ("pad-actions.invert-selection", NULL);
* g_signal_connect (action, "activate", on_invert_selection_activated, NULL);
* g_action_map_add_action (G_ACTION_MAP (action_group), action);
* …
* pad_controller = gtk_pad_controller_new (window, action_group, NULL);
* ]|
*/
#include "config.h"
#include "gtkeventcontrollerprivate.h"
#include "gtkpadcontroller.h"
#include "gtkwindow.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#ifdef GDK_WINDOWING_WAYLAND
#include <gdk/wayland/gdkwayland.h>
#endif
struct _GtkPadController {
GtkEventController parent_instance;
GActionGroup *action_group;
GdkDevice *pad;
GList *entries;
};
struct _GtkPadControllerClass {
GtkEventControllerClass parent_class;
};
enum {
PROP_0,
PROP_ACTION_GROUP,
PROP_PAD,
N_PROPS
};
static GParamSpec *pspecs[N_PROPS] = { NULL };
G_DEFINE_TYPE (GtkPadController, gtk_pad_controller, GTK_TYPE_EVENT_CONTROLLER)
static GtkPadActionEntry *
gtk_pad_action_entry_copy (const GtkPadActionEntry *entry)
{
GtkPadActionEntry *copy;
copy = g_slice_new0 (GtkPadActionEntry);
*copy = *entry;
copy->label = g_strdup (entry->label);
copy->action_name = g_strdup (entry->action_name);
return copy;
}
static void
gtk_pad_action_entry_free (GtkPadActionEntry *entry)
{
g_free (entry->label);
g_free (entry->action_name);
g_slice_free (GtkPadActionEntry, entry);
}
static const GtkPadActionEntry *
gtk_pad_action_find_match (GtkPadController *controller,
GtkPadActionType type,
gint index,
gint mode)
{
GList *l;
for (l = controller->entries; l; l = l->next)
{
GtkPadActionEntry *entry = l->data;
gboolean match_index = FALSE, match_mode = FALSE;
if (entry->type != type)
continue;
match_index = entry->index < 0 || entry->index == index;
match_mode = entry->mode < 0 || entry->mode == mode;
if (match_index && match_mode)
return entry;
}
return NULL;
}
static void
gtk_pad_controller_activate_action (GtkPadController *controller,
const GtkPadActionEntry *entry)
{
g_action_group_activate_action (controller->action_group,
entry->action_name,
NULL);
}
static void
gtk_pad_controller_handle_mode_switch (GtkPadController *controller,
GdkDevice *pad,
guint group,
guint mode)
{
}
static gboolean
gtk_pad_controller_filter_event (GtkEventController *controller,
const GdkEvent *event)
{
GtkPadController *pad_controller = GTK_PAD_CONTROLLER (controller);
if (event->type != GDK_PAD_BUTTON_PRESS &&
event->type != GDK_PAD_BUTTON_RELEASE &&
event->type != GDK_PAD_RING &&
event->type != GDK_PAD_STRIP &&
event->type != GDK_PAD_GROUP_MODE)
return TRUE;
if (pad_controller->pad &&
gdk_event_get_source_device (event) != pad_controller->pad)
return TRUE;
return FALSE;
}
static gboolean
gtk_pad_controller_handle_event (GtkEventController *controller,
const GdkEvent *event)
{
GtkPadController *pad_controller = GTK_PAD_CONTROLLER (controller);
const GtkPadActionEntry *entry;
GtkPadActionType type;
gint index, mode;
if (event->type == GDK_PAD_GROUP_MODE)
{
gtk_pad_controller_handle_mode_switch (pad_controller,
gdk_event_get_source_device (event),
event->pad_group_mode.group,
event->pad_group_mode.mode);
return GDK_EVENT_PROPAGATE;
}
switch (event->type)
{
case GDK_PAD_BUTTON_PRESS:
type = GTK_PAD_ACTION_BUTTON;
index = event->pad_button.button;
mode = event->pad_button.mode;
break;
case GDK_PAD_RING:
case GDK_PAD_STRIP:
type = event->type == GDK_PAD_RING ?
GTK_PAD_ACTION_RING : GTK_PAD_ACTION_STRIP;
index = event->pad_axis.index;
mode = event->pad_axis.mode;
break;
default:
return GDK_EVENT_PROPAGATE;
}
entry = gtk_pad_action_find_match (pad_controller,
type, index, mode);
if (!entry)
return GDK_EVENT_PROPAGATE;
gtk_pad_controller_activate_action (pad_controller, entry);
return GDK_EVENT_STOP;
}
static void
gtk_pad_controller_set_pad (GtkPadController *controller,
GdkDevice *pad)
{
g_return_if_fail (!pad || GDK_IS_DEVICE (pad));
g_return_if_fail (!pad || gdk_device_get_source (pad) == GDK_SOURCE_TABLET_PAD);
g_set_object (&controller->pad, pad);
}
static void
gtk_pad_controller_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkPadController *controller = GTK_PAD_CONTROLLER (object);
switch (prop_id)
{
case PROP_ACTION_GROUP:
controller->action_group = g_value_dup_object (value);
break;
case PROP_PAD:
gtk_pad_controller_set_pad (controller, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gtk_pad_controller_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkPadController *controller = GTK_PAD_CONTROLLER (object);
switch (prop_id)
{
case PROP_ACTION_GROUP:
g_value_set_object (value, controller->action_group);
break;
case PROP_PAD:
g_value_set_object (value, controller->pad);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gtk_pad_controller_dispose (GObject *object)
{
GtkPadController *controller = GTK_PAD_CONTROLLER (object);
g_clear_object (&controller->action_group);
g_clear_object (&controller->pad);
G_OBJECT_CLASS (gtk_pad_controller_parent_class)->dispose (object);
}
static void
gtk_pad_controller_finalize (GObject *object)
{
GtkPadController *controller = GTK_PAD_CONTROLLER (object);
g_list_free_full (controller->entries, (GDestroyNotify) gtk_pad_action_entry_free);
G_OBJECT_CLASS (gtk_pad_controller_parent_class)->finalize (object);
}
static void
gtk_pad_controller_class_init (GtkPadControllerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkEventControllerClass *controller_class = GTK_EVENT_CONTROLLER_CLASS (klass);
controller_class->filter_event = gtk_pad_controller_filter_event;
controller_class->handle_event = gtk_pad_controller_handle_event;
object_class->set_property = gtk_pad_controller_set_property;
object_class->get_property = gtk_pad_controller_get_property;
object_class->dispose = gtk_pad_controller_dispose;
object_class->finalize = gtk_pad_controller_finalize;
pspecs[PROP_ACTION_GROUP] =
g_param_spec_object ("action-group",
P_("Action group"),
P_("Action group to launch actions from"),
G_TYPE_ACTION_GROUP,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
pspecs[PROP_PAD] =
g_param_spec_object ("pad",
P_("Pad device"),
P_("Pad device to control"),
GDK_TYPE_DEVICE,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (object_class, N_PROPS, pspecs);
}
static void
gtk_pad_controller_init (GtkPadController *controller)
{
}
/**
* gtk_pad_controller_new:
* @window: a #GtkWindow
* @group: #GActionGroup to trigger actions from
* @pad: (nullable): A %GDK_SOURCE_TABLET_PAD device, or %NULL to handle all pads
*
* Creates a new #GtkPadController that will associate events from @pad to
* actions. A %NULL pad may be provided so the controller manages all pad devices
* generically, it is discouraged to mix #GtkPadController objects with %NULL
* and non-%NULL @pad argument on the same @window, as execution order is not
* guaranteed.
*
* The #GtkPadController is created with no mapped actions. In order to map pad
* events to actions, use gtk_pad_controller_set_action_entries() or
* gtk_pad_controller_set_action().
*
* Returns: A newly created #GtkPadController
*
* Since: 3.22
**/
GtkPadController *
gtk_pad_controller_new (GtkWindow *window,
GActionGroup *group,
GdkDevice *pad)
{
g_return_val_if_fail (GTK_IS_WINDOW (window), NULL);
g_return_val_if_fail (G_IS_ACTION_GROUP (group), NULL);
g_return_val_if_fail (!pad || GDK_IS_DEVICE (pad), NULL);
g_return_val_if_fail (!pad || gdk_device_get_source (pad) == GDK_SOURCE_TABLET_PAD, NULL);
return g_object_new (GTK_TYPE_PAD_CONTROLLER,
"propagation-phase", GTK_PHASE_CAPTURE,
"widget", window,
"action-group", group,
"pad", pad,
NULL);
}
static gint
entry_compare_func (gconstpointer a,
gconstpointer b)
{
const GtkPadActionEntry *entry1 = a, *entry2 = b;
if (entry1->mode > entry2->mode)
return -1;
else if (entry1->mode < entry2->mode)
return 1;
else if (entry1->index > entry2->index)
return -1;
else if (entry1->index < entry2->index)
return 1;
return 0;
}
static void
gtk_pad_controller_add_entry (GtkPadController *controller,
const GtkPadActionEntry *entry)
{
GtkPadActionEntry *copy;
copy = gtk_pad_action_entry_copy (entry);
controller->entries = g_list_insert_sorted (controller->entries, copy,
(GCompareFunc) entry_compare_func);
}
/**
* gtk_pad_controller_set_action_entries:
* @controller: a #GtkPadController
* @entries: (array length=n_entries): the action entries to set on @controller
* @n_entries: the number of elements in @entries
*
* This is a convenience function to add a group of action entries on
* @controller. See #GtkPadActionEntry and gtk_pad_controller_set_action().
*
* Since: 3.22
**/
void
gtk_pad_controller_set_action_entries (GtkPadController *controller,
const GtkPadActionEntry *entries,
gint n_entries)
{
gint i;
g_return_if_fail (GTK_IS_PAD_CONTROLLER (controller));
g_return_if_fail (entries != NULL);
for (i = 0; i < n_entries; i++)
gtk_pad_controller_add_entry (controller, &entries[i]);
}
/**
* gtk_pad_controller_set_action:
* @controller: a #GtkPadController
* @type: the type of pad feature that will trigger this action
* @index: the 0-indexed button/ring/strip number that will trigger this action
* @mode: the mode that will trigger this action, or -1 for all modes.
* @label: Human readable description of this action, this string should
* be deemed user-visible.
* @action_name: action name that will be activated in the #GActionGroup
*
* Adds an individual action to @controller. This action will only be activated
* if the given button/ring/strip number in @index is interacted while
* the current mode is @mode. -1 may be used for simple cases, so the action
* is triggered on all modes.
*
* The given @label should be considered user-visible, so internationalization
* rules apply. Some windowing systems may be able to use those for user
* feedback.
*
* Since: 3.22
**/
void
gtk_pad_controller_set_action (GtkPadController *controller,
GtkPadActionType type,
gint index,
gint mode,
const gchar *label,
const gchar *action_name)
{
GtkPadActionEntry entry = { type, index, mode,
(gchar *) label, (gchar *) action_name };
g_return_if_fail (GTK_IS_PAD_CONTROLLER (controller));
g_return_if_fail (type <= GTK_PAD_ACTION_RING);
gtk_pad_controller_add_entry (controller, &entry);
}

99
gtk/gtkpadcontroller.h Normal file
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@ -0,0 +1,99 @@
/* GTK - The GIMP Toolkit
* Copyright (C) 2016, Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Author(s): Carlos Garnacho <carlosg@gnome.org>
*/
#ifndef __GTK_PAD_CONTROLLER_H__
#define __GTK_PAD_CONTROLLER_H__
#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
#error "Only <gtk/gtk.h> can be included directly."
#endif
#include <gdk/gdk.h>
#include <gtk/gtkeventcontroller.h>
G_BEGIN_DECLS
#define GTK_TYPE_PAD_CONTROLLER (gtk_pad_controller_get_type ())
#define GTK_PAD_CONTROLLER(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_PAD_CONTROLLER, GtkPadController))
#define GTK_PAD_CONTROLLER_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), GTK_TYPE_PAD_CONTROLLER, GtkPadControllerClass))
#define GTK_IS_PAD_CONTROLLER(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_PAD_CONTROLLER))
#define GTK_IS_PAD_CONTROLLER_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), GTK_TYPE_PAD_CONTROLLER))
#define GTK_PAD_CONTROLLER_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GTK_TYPE_PAD_CONTROLLER, GtkPadControllerClass))
typedef struct _GtkPadController GtkPadController;
typedef struct _GtkPadControllerClass GtkPadControllerClass;
typedef struct _GtkPadActionEntry GtkPadActionEntry;
/**
* GtkPadActionType:
* @GTK_PAD_ACTION_BUTTON: Action is triggered by a pad button
* @GTK_PAD_ACTION_RING: Action is triggered by a pad ring
* @GTK_PAD_ACTION_STRIP: Action is triggered by a pad strip
*
* The type of a pad action.
*/
typedef enum {
GTK_PAD_ACTION_BUTTON,
GTK_PAD_ACTION_RING,
GTK_PAD_ACTION_STRIP
} GtkPadActionType;
/**
* GtkPadActionEntry:
* @type: the type of pad feature that will trigger this action entry.
* @index: the 0-indexed button/ring/strip number that will trigger this action
* entry.
* @mode: the mode that will trigger this action entry, or -1 for all modes.
* @label: Human readable description of this action entry, this string should
* be deemed user-visible.
* @action_name: action name that will be activated in the #GActionGroup.
*
* Struct defining a pad action entry.
*/
struct _GtkPadActionEntry {
GtkPadActionType type;
gint index;
gint mode;
gchar *label;
gchar *action_name;
};
GDK_AVAILABLE_IN_3_22
GType gtk_pad_controller_get_type (void) G_GNUC_CONST;
GDK_AVAILABLE_IN_3_22
GtkPadController *gtk_pad_controller_new (GtkWindow *window,
GActionGroup *group,
GdkDevice *pad);
GDK_AVAILABLE_IN_3_22
void gtk_pad_controller_set_action_entries (GtkPadController *controller,
const GtkPadActionEntry *entries,
gint n_entries);
GDK_AVAILABLE_IN_3_22
void gtk_pad_controller_set_action (GtkPadController *controller,
GtkPadActionType type,
gint index,
gint mode,
const gchar *label,
const gchar *action_name);
G_END_DECLS
#endif /* __GTK_PAD_CONTROLLER_H__ */