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DnD: fix setting icon in drag-begin

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Commit 1c96b703 changed the way icon
information is given to DnD. Previously an icon helper was kept at
the drag source site. Now an image definition is stored there.
The difference is that icon helper is an object that changes its
state in response to an icon being set, thus the object survived
multiple icon changes. Whereas image definition is destroyed and
re-created from scratch every time a drag icon is changed.
This created a problem where gtk_drag_begin_internal() would receive
the value of site->image_def when a drag just began, then it emits
"drag-begin" signal, in response to which an application can
set drag icon, changing the value of site->image_def. However,
gtk_drag_begin_internal() is unable to know about that change and
continues to use the old value it received from up the stack.

Not only does it prevent drag icon from being set from "drag-begin",
it also can induce a crash, since the old image_def value used
by gtk_drag_begin_internal() points to a freed memory region.

Fix this by only setting a default icon (which is created in-place)
in gtk_drag_begin_internal() if the caller does not care about icons.
Otherwise gtk_drag_begin_internal() will return a boolean that indicates
whether an icon needs to be set. Then the caller can invoke
gtk_drag_set_icon_definition() to set the icon, if needed.

Fixes #1407.
This commit is contained in:
Руслан Ижбулатов 2018-10-16 19:04:54 +00:00
parent 5e00fd25da
commit 4172138154
3 changed files with 28 additions and 25 deletions
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40
gtk/gtkdnd.c
View File

@ -1699,18 +1699,20 @@ gtk_drag_is_managed (GtkWidget *source_widget)
FALSE;
}
/* Like gtk_drag_begin(), but also takes a GtkIconHelper
* so that we can set the icon from the source site information
/* Like gtk_drag_begin(), but also communicates the need to
* create an icon for the drag operation back to the caller.
* If the caller passes out_needs_icon == NULL, it means that
* the caller does not care.
*/
GdkDragContext *
gtk_drag_begin_internal (GtkWidget *widget,
GtkImageDefinition *icon,
GtkTargetList *target_list,
GdkDragAction actions,
gint button,
const GdkEvent *event,
int x,
int y)
gtk_drag_begin_internal (GtkWidget *widget,
gboolean *out_needs_icon,
GtkTargetList *target_list,
GdkDragAction actions,
gint button,
const GdkEvent *event,
int x,
int y)
{
GtkDragSourceInfo *info;
GList *targets = NULL;
@ -1873,20 +1875,16 @@ gtk_drag_begin_internal (GtkWidget *widget,
* application may have set one in ::drag_begin, or it may
* not have set one.
*/
if (!info->icon_widget)
if (!info->icon_widget && out_needs_icon == NULL)
{
if (icon)
{
set_icon_helper (info->context, icon, 0, 0);
}
else
{
icon = gtk_image_definition_new_icon_name ("text-x-generic");
set_icon_helper (info->context, icon, 0, 0);
gtk_image_definition_unref (icon);
}
GtkImageDefinition *icon = gtk_image_definition_new_icon_name ("text-x-generic");
set_icon_helper (info->context, icon, 0, 0);
gtk_image_definition_unref (icon);
}
if (out_needs_icon != NULL)
*out_needs_icon = (info->icon_widget == NULL);
if (managed)
{
g_signal_connect (context, "drop-performed",

2
gtk/gtkdndprivate.h
View File

@ -43,7 +43,7 @@ struct _GtkDragDestSite
G_BEGIN_DECLS
GdkDragContext * gtk_drag_begin_internal (GtkWidget *widget,
GtkImageDefinition *icon,
gboolean *out_needs_icon,
GtkTargetList *target_list,
GdkDragAction actions,
gint button,

11
gtk/gtkdragsource.c
View File

@ -88,6 +88,8 @@ gtk_drag_source_event_cb (GtkWidget *widget,
GdkEventSequence *sequence;
GdkEvent *last_event;
guint button;
gboolean needs_icon;
GdkDragContext *context;
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (site->drag_gesture));
last_event = gdk_event_copy (gtk_gesture_get_last_event (site->drag_gesture, sequence));
@ -95,9 +97,12 @@ gtk_drag_source_event_cb (GtkWidget *widget,
button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (site->drag_gesture));
gtk_event_controller_reset (GTK_EVENT_CONTROLLER (site->drag_gesture));
gtk_drag_begin_internal (widget, site->image_def, site->target_list,
site->actions, button, last_event,
start_x, start_y);
context = gtk_drag_begin_internal (widget, &needs_icon, site->target_list,
site->actions, button, last_event,
start_x, start_y);
if (context != NULL && needs_icon)
gtk_drag_set_icon_definition (context, site->image_def, 0, 0);
gdk_event_free (last_event);