forked from AuroraMiddleware/gtk
dd251d85c4
We want to make events readonly, so stop translating their coordinates and instead pass the translated coordinates separately, when propagating events.
352 lines
11 KiB
C
352 lines
11 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2017-2018, Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author(s): Carlos Garnacho <carlosg@gnome.org>
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*/
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/**
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* SECTION:gtkgesturestylus
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* @Short_description: Gesture for stylus input
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* @Title: GtkGestureStylus
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* @See_also: #GtkGesture, #GtkGestureSingle
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*
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* #GtkGestureStylus is a #GtkGesture implementation specific to stylus
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* input. The provided signals just provide the basic information
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*/
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#include "config.h"
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#include "gtkgesturestylus.h"
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#include "gtkgesturestylusprivate.h"
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#include "gtkprivate.h"
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#include "gtkintl.h"
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#include "gtkmarshalers.h"
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#include "gtkmain.h"
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G_DEFINE_TYPE (GtkGestureStylus, gtk_gesture_stylus, GTK_TYPE_GESTURE_SINGLE)
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enum {
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PROXIMITY,
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DOWN,
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MOTION,
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UP,
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N_SIGNALS
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};
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static guint signals[N_SIGNALS] = { 0, };
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static gboolean
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gtk_gesture_stylus_handle_event (GtkEventController *controller,
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const GdkEvent *event,
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double x,
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double y)
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{
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GdkModifierType modifiers;
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guint n_signal;
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GTK_EVENT_CONTROLLER_CLASS (gtk_gesture_stylus_parent_class)->handle_event (controller, event, x, y);
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if (!gdk_event_get_device_tool (event))
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return FALSE;
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switch ((guint) gdk_event_get_event_type (event))
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{
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case GDK_BUTTON_PRESS:
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n_signal = DOWN;
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break;
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case GDK_BUTTON_RELEASE:
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n_signal = UP;
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break;
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case GDK_MOTION_NOTIFY:
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gdk_event_get_state (event, &modifiers);
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if (modifiers & GDK_BUTTON1_MASK)
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n_signal = MOTION;
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else
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n_signal = PROXIMITY;
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break;
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default:
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return FALSE;
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}
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g_signal_emit (controller, signals[n_signal], 0, x, y);
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return TRUE;
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}
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static void
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gtk_gesture_stylus_class_init (GtkGestureStylusClass *klass)
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{
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GtkEventControllerClass *event_controller_class;
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event_controller_class = GTK_EVENT_CONTROLLER_CLASS (klass);
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event_controller_class->handle_event = gtk_gesture_stylus_handle_event;
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signals[PROXIMITY] =
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g_signal_new (I_("proximity"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkGestureStylusClass, proximity),
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NULL, NULL,
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_gtk_marshal_VOID__DOUBLE_DOUBLE,
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G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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g_signal_set_va_marshaller (signals[PROXIMITY],
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G_TYPE_FROM_CLASS (klass),
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_gtk_marshal_VOID__DOUBLE_DOUBLEv);
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signals[DOWN] =
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g_signal_new (I_("down"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkGestureStylusClass, down),
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NULL, NULL,
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_gtk_marshal_VOID__DOUBLE_DOUBLE,
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G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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g_signal_set_va_marshaller (signals[DOWN],
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G_TYPE_FROM_CLASS (klass),
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_gtk_marshal_VOID__DOUBLE_DOUBLEv);
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signals[MOTION] =
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g_signal_new (I_("motion"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkGestureStylusClass, motion),
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NULL, NULL,
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_gtk_marshal_VOID__DOUBLE_DOUBLE,
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G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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g_signal_set_va_marshaller (signals[MOTION],
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G_TYPE_FROM_CLASS (klass),
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_gtk_marshal_VOID__DOUBLE_DOUBLEv);
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signals[UP] =
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g_signal_new (I_("up"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkGestureStylusClass, up),
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NULL, NULL,
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_gtk_marshal_VOID__DOUBLE_DOUBLE,
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G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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g_signal_set_va_marshaller (signals[UP],
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G_TYPE_FROM_CLASS (klass),
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_gtk_marshal_VOID__DOUBLE_DOUBLEv);
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}
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static void
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gtk_gesture_stylus_init (GtkGestureStylus *gesture)
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{
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}
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/**
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* gtk_gesture_stylus_new:
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*
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* Creates a new #GtkGestureStylus.
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*
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* Returns: a newly created stylus gesture
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**/
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GtkGesture *
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gtk_gesture_stylus_new (void)
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{
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return g_object_new (GTK_TYPE_GESTURE_STYLUS,
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NULL);
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}
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static const GdkEvent *
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gesture_get_current_event (GtkGestureStylus *gesture)
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{
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GdkEventSequence *sequence;
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sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
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return gtk_gesture_get_last_event (GTK_GESTURE (gesture), sequence);
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}
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/**
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* gtk_gesture_stylus_get_axis:
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* @gesture: a #GtkGestureStylus
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* @axis: requested device axis
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* @value: (out): return location for the axis value
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*
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* Returns the current value for the requested @axis. This function
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* must be called from either the #GtkGestureStylus::down,
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* #GtkGestureStylus::motion, #GtkGestureStylus::up or #GtkGestureStylus::proximity
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* signals.
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*
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* Returns: #TRUE if there is a current value for the axis
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**/
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gboolean
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gtk_gesture_stylus_get_axis (GtkGestureStylus *gesture,
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GdkAxisUse axis,
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gdouble *value)
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{
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const GdkEvent *event;
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g_return_val_if_fail (GTK_IS_GESTURE_STYLUS (gesture), FALSE);
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g_return_val_if_fail (axis < GDK_AXIS_LAST, FALSE);
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g_return_val_if_fail (value != NULL, FALSE);
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event = gesture_get_current_event (gesture);
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if (!event)
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return FALSE;
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return gdk_event_get_axis (event, axis, value);
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}
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/**
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* gtk_gesture_stylus_get_axes:
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* @gesture: a GtkGestureStylus
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* @axes: (array): array of requested axes, terminated with #GDK_AXIS_IGNORE
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* @values: (out) (array): return location for the axis values
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*
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* Returns the current values for the requested @axes. This function
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* must be called from either the #GtkGestureStylus::down,
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* #GtkGestureStylus::motion, #GtkGestureStylus::up or #GtkGestureStylus::proximity
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* signals.
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*
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* Returns: #TRUE if there is a current value for the axes
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**/
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gboolean
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gtk_gesture_stylus_get_axes (GtkGestureStylus *gesture,
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GdkAxisUse axes[],
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gdouble **values)
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{
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const GdkEvent *event;
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GArray *array;
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gint i = 0;
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g_return_val_if_fail (GTK_IS_GESTURE_STYLUS (gesture), FALSE);
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g_return_val_if_fail (values != NULL, FALSE);
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event = gesture_get_current_event (gesture);
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if (!event)
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return FALSE;
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array = g_array_new (TRUE, FALSE, sizeof (gdouble));
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while (axes[i] != GDK_AXIS_IGNORE)
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{
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gdouble value;
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if (axes[i] >= GDK_AXIS_LAST)
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{
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g_warning ("Requesting unknown axis %d, did you "
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"forget to add a last GDK_AXIS_IGNORE axis?",
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axes[i]);
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g_array_free (array, TRUE);
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return FALSE;
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}
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gdk_event_get_axis (event, axes[i], &value);
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g_array_append_val (array, value);
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i++;
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}
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*values = (gdouble *) g_array_free (array, FALSE);
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return TRUE;
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}
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/**
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* gtk_gesture_stylus_get_backlog:
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* @gesture: a #GtkGestureStylus
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* @backlog: (out) (array length=n_elems): coordinates and times for the backlog events
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* @n_elems: (out): return location for the number of elements
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*
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* By default, GTK+ will limit rate of input events. On stylus input where
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* accuracy of strokes is paramount, this function returns the accumulated
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* coordinate/timing state before the emission of the current
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* #GtkGestureStylus:motion signal.
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*
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* This function may only be called within a #GtkGestureStylus::motion
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* signal handler, the state given in this signal and obtainable through
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* gtk_gesture_stylus_get_axis() call express the latest (most up-to-date)
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* state in motion history.
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*
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* @backlog is provided in chronological order.
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*
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* Returns: #TRUE if there is a backlog to unfold in the current state.
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**/
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gboolean
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gtk_gesture_stylus_get_backlog (GtkGestureStylus *gesture,
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GdkTimeCoord **backlog,
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guint *n_elems)
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{
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const GdkEvent *event;
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GArray *backlog_array;
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GList *history = NULL, *l;
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g_return_val_if_fail (GTK_IS_GESTURE_STYLUS (gesture), FALSE);
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g_return_val_if_fail (backlog != NULL && n_elems != NULL, FALSE);
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event = gesture_get_current_event (gesture);
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if (event)
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history = gdk_event_get_motion_history (event);
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if (!history)
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return FALSE;
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backlog_array = g_array_new (FALSE, FALSE, sizeof (GdkTimeCoord));
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for (l = history; l; l = l->next)
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{
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GdkTimeCoord *time_coord = l->data;
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graphene_point_t p;
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g_array_append_val (backlog_array, *time_coord);
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time_coord = &g_array_index (backlog_array, GdkTimeCoord, backlog_array->len - 1);
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if (gtk_widget_compute_point (gtk_get_event_widget (event),
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gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)),
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&GRAPHENE_POINT_INIT (time_coord->axes[GDK_AXIS_X],
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time_coord->axes[GDK_AXIS_Y]),
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&p))
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{
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time_coord->axes[GDK_AXIS_X] = p.x;
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time_coord->axes[GDK_AXIS_Y] = p.y;
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}
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else
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{
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g_array_set_size (backlog_array, backlog_array->len - 1);
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}
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}
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*n_elems = backlog_array->len;
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*backlog = (GdkTimeCoord *) g_array_free (backlog_array, FALSE);
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g_list_free (history);
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return TRUE;
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}
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/**
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* gtk_gesture_stylus_get_device_tool:
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* @gesture: a #GtkGestureStylus
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*
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* Returns the #GdkDeviceTool currently driving input through this gesture.
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* This function must be called from either the #GtkGestureStylus::down,
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* #GtkGestureStylus::motion, #GtkGestureStylus::up or #GtkGestureStylus::proximity
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* signal handlers.
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*
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* Returns: (nullable) (transfer none): The current stylus tool
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**/
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GdkDeviceTool *
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gtk_gesture_stylus_get_device_tool (GtkGestureStylus *gesture)
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{
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const GdkEvent *event;
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g_return_val_if_fail (GTK_IS_GESTURE_STYLUS (gesture), FALSE);
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event = gesture_get_current_event (gesture);
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if (!event)
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return NULL;
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return gdk_event_get_device_tool (event);
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}
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