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sdgui: support touch screen dragging for the view

This commit is contained in:
Přemysl Eric Janouch 2022-07-24 23:14:36 +02:00
parent aa985514a6
commit 259d0ac860
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 42 additions and 0 deletions
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42
src/stardict-view.c
View File

@ -223,6 +223,7 @@ struct _StardictView
gchar *matched; ///< Highlight common word part of this
gint top_offset; ///< Pixel offset into the entry
gdouble drag_last_offset; ///< Last offset when dragging
// TODO: think about making it, e.g., a pair of (ViewEntry *, guint)
// NOTE: this is the index of a Pango paragraph (a virtual entity)
guint selected; ///< Offset to the selected definition
@ -500,6 +501,38 @@ stardict_view_scroll_event (GtkWidget *widget, GdkEventScroll *event)
}
}
static void
on_drag_begin (GtkGestureDrag *drag, G_GNUC_UNUSED gdouble start_x,
G_GNUC_UNUSED gdouble start_y, gpointer user_data)
{
GtkGesture *gesture = GTK_GESTURE (drag);
GdkEventSequence *sequence
= gtk_gesture_get_last_updated_sequence (gesture);
GdkModifierType state = 0;
const GdkEvent *last_event = gtk_gesture_get_last_event (gesture, sequence);
gdk_event_get_state (last_event, &state);
if (state & gtk_accelerator_get_default_mod_mask ())
gtk_gesture_set_sequence_state (gesture, sequence,
GTK_EVENT_SEQUENCE_DENIED);
else
{
gtk_gesture_set_sequence_state (gesture, sequence,
GTK_EVENT_SEQUENCE_CLAIMED);
STARDICT_VIEW (user_data)->drag_last_offset = 0;
}
}
static void
on_drag_update (G_GNUC_UNUSED GtkGestureDrag *drag,
G_GNUC_UNUSED gdouble offset_x, gdouble offset_y, gpointer user_data)
{
StardictView *self = STARDICT_VIEW (user_data);
self->top_offset += self->drag_last_offset - offset_y;
adjust_for_offset (self);
self->drag_last_offset = offset_y;
}
static void
stardict_view_class_init (StardictViewClass *klass)
{
@ -523,6 +556,15 @@ stardict_view_class_init (StardictViewClass *klass)
static void
stardict_view_init (G_GNUC_UNUSED StardictView *self)
{
GtkGesture *drag = gtk_gesture_drag_new (GTK_WIDGET (self));
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (drag), TRUE);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (drag),
GTK_PHASE_BUBBLE);
g_object_set_data_full (G_OBJECT (self), "stardict-view-drag-gesture",
drag, g_object_unref);
g_signal_connect (drag, "drag-begin", G_CALLBACK (on_drag_begin), self);
g_signal_connect (drag, "drag-update", G_CALLBACK (on_drag_update), self);
}
// --- Public ------------------------------------------------------------------