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gimp/app/widgets/gimppanedbox.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimppanedbox.c
* Copyright (C) 2001-2005 Michael Natterer <mitch@gimp.org>
* Copyright (C) 2009-2011 Martin Nordholts <martinn@src.gnome.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimp.h"
#include "core/gimpcontext.h"
#include "gimpdialogfactory.h"
#include "gimpdnd.h"
#include "gimpdockable.h"
#include "gimpdockbook.h"
#include "gimpmenudock.h"
#include "gimppanedbox.h"
#include "gimptoolbox.h"
#include "gimpwidgets-utils.h"
#include "gimp-log.h"
/**
* Defines the size of the area that dockables can be dropped on in
* order to be inserted and get space on their own (rather than
* inserted among others and sharing space)
*/
#define DROP_AREA_SIZE 6
#define DROP_HIGHLIGHT_MIN_SIZE 32
#define DROP_HIGHLIGHT_COLOR "#215d9c"
#define DROP_HIGHLIGHT_OPACITY_ACTIVE 0.8
#define DROP_HIGHLIGHT_OPACITY_INACTIVE 0.4
#define INSERT_INDEX_UNUSED G_MININT
typedef struct
{
gboolean active;
GeglRectangle area;
gdouble opacity;
} GimpPanedBoxHighlight;
struct _GimpPanedBoxPrivate
{
/* Widgets that are separated by panes */
GList *widgets;
/* Is the DND highlight shown */
GimpPanedBoxHighlight dnd_highlights[3];
gint dnd_n_highlights;
GdkDragContext *dnd_context;
gint dnd_paned_position;
gint dnd_idle_id;
/* The insert index to use on drop */
gint insert_index;
/* Callback on drop */
GimpPanedBoxDroppedFunc dropped_cb;
gpointer dropped_cb_data;
/* A drag handler offered to handle drag events */
GimpPanedBox *drag_handler;
};
static void gimp_paned_box_dispose (GObject *object);
static void gimp_paned_box_drag_leave (GtkWidget *widget,
GdkDragContext *context,
guint time);
static gboolean gimp_paned_box_drag_motion (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time);
static gboolean gimp_paned_box_drag_drop (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time);
static void gimp_paned_box_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *data,
guint info,
guint time);
static void gimp_paned_box_set_widget_drag_handler (GtkWidget *widget,
GimpPanedBox *handler);
static gint gimp_paned_box_get_drop_area_size (GimpPanedBox *paned_box);
static void gimp_paned_box_hide_drop_indicator (GimpPanedBox *paned_box,
gint index);
static void gimp_paned_box_drag_callback (GdkDragContext *context,
gboolean begin,
GimpPanedBox *paned_box);
G_DEFINE_TYPE_WITH_PRIVATE (GimpPanedBox, gimp_paned_box, GTK_TYPE_BOX)
#define parent_class gimp_paned_box_parent_class
static const GtkTargetEntry dialog_target_table[] = { GIMP_TARGET_NOTEBOOK_TAB };
static GSList *drop_hints = NULL;
static void
gimp_paned_box_class_init (GimpPanedBoxClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->dispose = gimp_paned_box_dispose;
widget_class->drag_leave = gimp_paned_box_drag_leave;
widget_class->drag_motion = gimp_paned_box_drag_motion;
widget_class->drag_drop = gimp_paned_box_drag_drop;
widget_class->drag_data_received = gimp_paned_box_drag_data_received;
}
static void
gimp_paned_box_init (GimpPanedBox *paned_box)
{
paned_box->p = gimp_paned_box_get_instance_private (paned_box);
/* Setup DND */
gtk_drag_dest_set (GTK_WIDGET (paned_box),
0,
dialog_target_table, G_N_ELEMENTS (dialog_target_table),
GDK_ACTION_MOVE);
gimp_dockbook_add_drag_callback (
(GimpDockbookDragCallback) gimp_paned_box_drag_callback,
paned_box);
}
static void
gimp_paned_box_dispose (GObject *object)
{
GimpPanedBox *paned_box = GIMP_PANED_BOX (object);
gsize i;
for (i = 0; i < G_N_ELEMENTS (paned_box->p->dnd_highlights); i++)
gimp_paned_box_hide_drop_indicator (paned_box, i);
if (paned_box->p->dnd_idle_id)
{
g_source_remove (paned_box->p->dnd_idle_id);
paned_box->p->dnd_idle_id = 0;
}
while (paned_box->p->widgets)
{
GtkWidget *widget = paned_box->p->widgets->data;
g_object_ref (widget);
gimp_paned_box_remove_widget (paned_box, widget);
gtk_widget_destroy (widget);
g_object_unref (widget);
}
gimp_dockbook_remove_drag_callback (
(GimpDockbookDragCallback) gimp_paned_box_drag_callback,
paned_box);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_paned_box_set_widget_drag_handler (GtkWidget *widget,
GimpPanedBox *drag_handler)
{
/* Hook us in for drag events. We could abstract this properly and
* put gimp_paned_box_will_handle_drag() in an interface for
* example, but it doesn't feel worth it at this point
*
* Note that we don't have 'else if's because a widget can be both a
* dock and a toolbox for example, in which case we want to set a
* drag handler in two ways
*
* We so need to introduce some abstractions here...
*/
if (GIMP_IS_DOCKBOOK (widget))
{
gimp_dockbook_set_drag_handler (GIMP_DOCKBOOK (widget),
drag_handler);
}
if (GIMP_IS_DOCK (widget))
{
GimpPanedBox *dock_paned_box = NULL;
dock_paned_box = GIMP_PANED_BOX (gimp_dock_get_vbox (GIMP_DOCK (widget)));
gimp_paned_box_set_drag_handler (dock_paned_box, drag_handler);
}
if (GIMP_IS_TOOLBOX (widget))
{
GimpToolbox *toolbox = GIMP_TOOLBOX (widget);
gimp_toolbox_set_drag_handler (toolbox, drag_handler);
}
}
static gint
gimp_paned_box_get_drop_area_size (GimpPanedBox *paned_box)
{
gint drop_area_size = 0;
if (! paned_box->p->widgets)
{
GtkAllocation allocation;
GtkOrientation orientation;
gtk_widget_get_allocation (GTK_WIDGET (paned_box), &allocation);
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (paned_box));
if (orientation == GTK_ORIENTATION_HORIZONTAL)
drop_area_size = allocation.width;
else if (orientation == GTK_ORIENTATION_VERTICAL)
drop_area_size = allocation.height;
}
drop_area_size = MAX (drop_area_size, DROP_AREA_SIZE);
return drop_area_size;
}
static gboolean
gimp_paned_box_get_handle_drag (GimpPanedBox *paned_box,
GdkDragContext *context,
gint x,
gint y,
guint time,
gint *insert_index,
GeglRectangle *area)
{
gint index = INSERT_INDEX_UNUSED;
GtkAllocation allocation = { 0, };
gint area_x = 0;
gint area_y = 0;
gint area_w = 0;
gint area_h = 0;
GtkOrientation orientation = 0;
gint drop_area_size = gimp_paned_box_get_drop_area_size (paned_box);
if (gimp_paned_box_will_handle_drag (paned_box->p->drag_handler,
GTK_WIDGET (paned_box),
context,
x, y,
time))
{
return FALSE;
}
if (gtk_drag_dest_find_target (GTK_WIDGET (paned_box), context, NULL) ==
GDK_NONE)
{
return FALSE;
}
gtk_widget_get_allocation (GTK_WIDGET (paned_box), &allocation);
/* See if we're at the edge of the dock If there are no dockables,
* the entire paned box is a drop area
*/
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (paned_box));
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
area_y = 0;
area_h = allocation.height;
/* If there are no widgets, the drop area is as big as the paned
* box
*/
if (! paned_box->p->widgets)
area_w = allocation.width;
else
area_w = drop_area_size;
if (x < drop_area_size)
{
index = 0;
area_x = 0;
}
if (x > allocation.width - drop_area_size)
{
index = -1;
area_x = allocation.width - drop_area_size;
}
}
else /* if (orientation = GTK_ORIENTATION_VERTICAL) */
{
area_x = 0;
area_w = allocation.width;
/* If there are no widgets, the drop area is as big as the paned
* box
*/
if (! paned_box->p->widgets)
area_h = allocation.height;
else
area_h = drop_area_size;
if (y < drop_area_size)
{
index = 0;
area_y = 0;
}
if (y > allocation.height - drop_area_size)
{
index = -1;
area_y = allocation.height - drop_area_size;
}
}
if (area)
{
area->x = allocation.x + area_x;
area->y = allocation.y + area_y;
area->width = area_w;
area->height = area_h;
}
if (insert_index)
*insert_index = index;
return index != INSERT_INDEX_UNUSED;
}
static gboolean
gimp_paned_box_drop_indicator_draw (GtkWidget *widget,
cairo_t *cr,
gpointer data)
{
GimpPanedBox *paned_box = GIMP_PANED_BOX (widget);
GimpRGB color;
gsize i;
gimp_rgb_parse_hex (&color, DROP_HIGHLIGHT_COLOR, -1);
for (i = 0; i < G_N_ELEMENTS (paned_box->p->dnd_highlights); i++)
{
const GimpPanedBoxHighlight *highlight = &paned_box->p->dnd_highlights[i];
if (! highlight->active)
continue;
cairo_set_source_rgba (cr, color.r, color.g, color.b, highlight->opacity);
cairo_rectangle (cr,
highlight->area.x,
highlight->area.y,
highlight->area.width,
highlight->area.height);
cairo_fill (cr);
}
return FALSE;
}
static void
gimp_paned_box_position_drop_indicator (GimpPanedBox *paned_box,
gint index,
const GeglRectangle *area,
gdouble opacity)
{
GtkWidget *widget = GTK_WIDGET (paned_box);
paned_box->p->dnd_highlights[index].area = *area;
paned_box->p->dnd_highlights[index].opacity = opacity;
if (! paned_box->p->dnd_highlights[index].active)
{
if (paned_box->p->dnd_n_highlights == 0)
{
g_signal_connect_after (
widget, "draw",
G_CALLBACK (gimp_paned_box_drop_indicator_draw),
NULL);
}
paned_box->p->dnd_highlights[index].active = TRUE;
paned_box->p->dnd_n_highlights++;
}
gtk_widget_queue_draw (widget);
}
static void
gimp_paned_box_hide_drop_indicator (GimpPanedBox *paned_box,
gint index)
{
GtkWidget *widget = GTK_WIDGET (paned_box);
if (paned_box->p->dnd_highlights[index].active)
{
paned_box->p->dnd_highlights[index].active = FALSE;
paned_box->p->dnd_n_highlights--;
if (paned_box->p->dnd_n_highlights == 0)
{
g_signal_handlers_disconnect_by_func (
widget,
gimp_paned_box_drop_indicator_draw,
NULL);
}
}
gtk_widget_queue_draw (widget);
}
static void
gimp_paned_box_drag_leave (GtkWidget *widget,
GdkDragContext *context,
guint time)
{
gimp_paned_box_hide_drop_indicator (GIMP_PANED_BOX (widget), 0);
}
static gboolean
gimp_paned_box_drag_motion (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time)
{
GimpPanedBox *paned_box = GIMP_PANED_BOX (widget);
gint insert_index;
GeglRectangle area;
gboolean handle;
handle = gimp_paned_box_get_handle_drag (paned_box, context, x, y, time,
&insert_index, &area);
/* If we are at the edge, show a highlight to communicate that a
* drop will create a new dock column
*/
if (handle)
{
gimp_paned_box_position_drop_indicator (paned_box,
0,
&area,
DROP_HIGHLIGHT_OPACITY_ACTIVE);
}
else
{
gimp_paned_box_hide_drop_indicator (paned_box, 0);
}
/* Save the insert index for drag-drop */
paned_box->p->insert_index = insert_index;
gdk_drag_status (context, handle ? GDK_ACTION_MOVE : 0, time);
/* Return TRUE so drag_leave() is called */
return handle;
}
static gboolean
gimp_paned_box_drag_drop (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time)
{
GimpPanedBox *paned_box = GIMP_PANED_BOX (widget);
GdkAtom target;
if (gimp_paned_box_will_handle_drag (paned_box->p->drag_handler,
widget,
context,
x, y,
time))
{
return FALSE;
}
target = gtk_drag_dest_find_target (widget, context, NULL);
if (target == GDK_NONE)
return FALSE;
gtk_drag_get_data (widget, context, target, time);
return TRUE;
}
static void
gimp_paned_box_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *data,
guint info,
guint time)
{
GimpPanedBox *paned_box = GIMP_PANED_BOX (widget);
GtkWidget *notebook = gtk_drag_get_source_widget (context);
GtkWidget **child = (gpointer) gtk_selection_data_get_data (data);
gboolean dropped = FALSE;
if (paned_box->p->dropped_cb)
{
dropped = paned_box->p->dropped_cb (notebook,
*child,
paned_box->p->insert_index,
paned_box->p->dropped_cb_data);
}
gtk_drag_finish (context, dropped, TRUE, time);
}
static gboolean
gimp_paned_box_drag_callback_idle (GimpPanedBox *paned_box)
{
GtkAllocation allocation;
GtkOrientation orientation;
GeglRectangle area;
paned_box->p->dnd_idle_id = 0;
gtk_widget_get_allocation (GTK_WIDGET (paned_box), &allocation);
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (paned_box));
#define ADD_AREA(index, left, top) \
if (gimp_paned_box_get_handle_drag ( \
paned_box, \
paned_box->p->dnd_context, \
(left), (top), \
0, \
NULL, &area)) \
{ \
gimp_paned_box_position_drop_indicator ( \
paned_box, \
index, \
&area, \
DROP_HIGHLIGHT_OPACITY_INACTIVE); \
}
if (! paned_box->p->widgets)
{
ADD_AREA (1, allocation.width / 2, allocation.height / 2)
}
else if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
ADD_AREA (1, 0, allocation.height / 2)
ADD_AREA (2, allocation.width - 1, allocation.height / 2)
}
else
{
ADD_AREA (1, allocation.width / 2, 0)
ADD_AREA (2, allocation.width / 2, allocation.height - 1)
}
#undef ADD_AREA
return G_SOURCE_REMOVE;
}
static void
gimp_paned_box_drag_callback (GdkDragContext *context,
gboolean begin,
GimpPanedBox *paned_box)
{
GtkWidget *paned;
gint position;
if (! gtk_widget_get_sensitive (GTK_WIDGET (paned_box)))
return;
paned = gtk_widget_get_ancestor (GTK_WIDGET (paned_box),
GTK_TYPE_PANED);
/* apparently, we can be called multiple times when beginning a drag
* (possibly a gtk bug); make sure not to leak the idle.
*
* see issue #4895.
*/
if (begin && ! paned_box->p->dnd_context)
{
paned_box->p->dnd_context = context;
if (paned)
{
GtkAllocation allocation;
gtk_widget_get_allocation (paned, &allocation);
position = gtk_paned_get_position (GTK_PANED (paned));
paned_box->p->dnd_paned_position = position;
if (position < 0)
{
position = 0;
}
else if (gtk_widget_is_ancestor (
GTK_WIDGET (paned_box),
gtk_paned_get_child2 (GTK_PANED (paned))))
{
position = allocation.width - position;
}
if (position < DROP_HIGHLIGHT_MIN_SIZE)
{
position = DROP_HIGHLIGHT_MIN_SIZE;
if (gtk_widget_is_ancestor (
GTK_WIDGET (paned_box),
gtk_paned_get_child2 (GTK_PANED (paned))))
{
position = allocation.width - position;
}
gtk_paned_set_position (GTK_PANED (paned), position);
}
}
paned_box->p->dnd_idle_id = g_idle_add (
(GSourceFunc) gimp_paned_box_drag_callback_idle,
paned_box);
}
else if (! begin && paned_box->p->dnd_context)
{
if (paned_box->p->dnd_idle_id)
{
g_source_remove (paned_box->p->dnd_idle_id);
paned_box->p->dnd_idle_id = 0;
}
paned_box->p->dnd_context = NULL;
gimp_paned_box_hide_drop_indicator (paned_box, 1);
gimp_paned_box_hide_drop_indicator (paned_box, 2);
if (paned)
{
gtk_paned_set_position (GTK_PANED (paned),
paned_box->p->dnd_paned_position);
}
}
}
GtkWidget *
gimp_paned_box_new (gboolean homogeneous,
gint spacing,
GtkOrientation orientation)
{
return g_object_new (GIMP_TYPE_PANED_BOX,
"homogeneous", homogeneous,
"spacing", 0,
"orientation", orientation,
NULL);
}
void
gimp_paned_box_set_dropped_cb (GimpPanedBox *paned_box,
GimpPanedBoxDroppedFunc dropped_cb,
gpointer dropped_cb_data)
{
g_return_if_fail (GIMP_IS_PANED_BOX (paned_box));
paned_box->p->dropped_cb = dropped_cb;
paned_box->p->dropped_cb_data = dropped_cb_data;
}
/**
* gimp_paned_box_add_widget:
* @paned_box: A #GimpPanedBox
* @widget: The #GtkWidget to add
* @index: Where to add the @widget
*
* Add a #GtkWidget to the #GimpPanedBox in a hierarchy of #GtkPaned:s
* so the space can be manually distributed between the widgets.
**/
void
gimp_paned_box_add_widget (GimpPanedBox *paned_box,
GtkWidget *widget,
gint index)
{
gint old_length = 0;
g_return_if_fail (GIMP_IS_PANED_BOX (paned_box));
g_return_if_fail (GTK_IS_WIDGET (widget));
GIMP_LOG (DND, "Adding GtkWidget %p to GimpPanedBox %p", widget, paned_box);
/* Calculate length */
old_length = g_list_length (paned_box->p->widgets);
/* If index is invalid append at the end */
if (index >= old_length || index < 0)
{
index = old_length;
}
/* Insert into the list */
paned_box->p->widgets = g_list_insert (paned_box->p->widgets, widget, index);
/* Hook us in for drag events. We could abstract this but it doesn't
* seem worth it at this point
*/
gimp_paned_box_set_widget_drag_handler (widget, paned_box);
/* Insert into the GtkPaned hierarchy */
if (old_length == 0)
{
/* A widget is added, hide the instructions */
//gtk_widget_hide (paned_box->p->instructions);
drop_hints = g_slist_remove (drop_hints, paned_box);
gtk_box_pack_start (GTK_BOX (paned_box), widget, TRUE, TRUE, 0);
}
else
{
GtkWidget *old_widget;
GtkWidget *parent;
GtkWidget *paned;
GtkOrientation orientation;
/* Figure out what widget to detach */
if (index == 0)
{
old_widget = g_list_nth_data (paned_box->p->widgets, index + 1);
}
else
{
old_widget = g_list_nth_data (paned_box->p->widgets, index - 1);
}
parent = gtk_widget_get_parent (old_widget);
if (old_length > 1 && index > 0)
{
GtkWidget *grandparent = gtk_widget_get_parent (parent);
old_widget = parent;
parent = grandparent;
}
/* Detach the widget and build up a new hierarchy */
g_object_ref (old_widget);
gtk_container_remove (GTK_CONTAINER (parent), old_widget);
/* GtkPaned is abstract :( */
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (paned_box));
paned = gtk_paned_new (orientation);
gtk_paned_set_wide_handle (GTK_PANED (paned), TRUE);
if (GTK_IS_PANED (parent))
{
gtk_paned_pack1 (GTK_PANED (parent), paned, TRUE, FALSE);
}
else
{
gtk_box_pack_start (GTK_BOX (parent), paned, TRUE, TRUE, 0);
}
gtk_widget_show (paned);
if (index == 0)
{
gtk_paned_pack1 (GTK_PANED (paned), widget,
TRUE, FALSE);
gtk_paned_pack2 (GTK_PANED (paned), old_widget,
TRUE, FALSE);
}
else
{
gtk_paned_pack1 (GTK_PANED (paned), old_widget,
TRUE, FALSE);
gtk_paned_pack2 (GTK_PANED (paned), widget,
TRUE, FALSE);
}
g_object_unref (old_widget);
}
}
/**
* gimp_paned_box_remove_widget:
* @paned_box: A #GimpPanedBox
* @widget: The #GtkWidget to remove
*
* Remove a #GtkWidget from a #GimpPanedBox added with
* gimp_widgets_add_paned_widget().
**/
void
gimp_paned_box_remove_widget (GimpPanedBox *paned_box,
GtkWidget *widget)
{
gint old_length = 0;
gint index = 0;
GtkWidget *other_widget = NULL;
GtkWidget *parent = NULL;
GtkWidget *grandparent = NULL;
g_return_if_fail (GIMP_IS_PANED_BOX (paned_box));
g_return_if_fail (GTK_IS_WIDGET (widget));
GIMP_LOG (DND, "Removing GtkWidget %p from GimpPanedBox %p", widget, paned_box);
/* Calculate length and index */
old_length = g_list_length (paned_box->p->widgets);
index = g_list_index (paned_box->p->widgets, widget);
/* Remove from list */
paned_box->p->widgets = g_list_remove (paned_box->p->widgets, widget);
/* Reset the drag events hook */
gimp_paned_box_set_widget_drag_handler (widget, NULL);
/* Remove from widget hierarchy */
if (old_length == 1)
{
/* The widget might already be parent-less if we are in
* destruction, .e.g when closing a dock window.
*/
if (gtk_widget_get_parent (widget) != NULL)
gtk_container_remove (GTK_CONTAINER (paned_box), widget);
/* The last widget is removed, show the instructions */
//gtk_widget_show (paned_box->p->instructions);
drop_hints = g_slist_prepend (drop_hints, paned_box);
}
else
{
g_object_ref (widget);
parent = gtk_widget_get_parent (GTK_WIDGET (widget));
grandparent = gtk_widget_get_parent (parent);
if (index == 0)
other_widget = gtk_paned_get_child2 (GTK_PANED (parent));
else
other_widget = gtk_paned_get_child1 (GTK_PANED (parent));
g_object_ref (other_widget);
gtk_container_remove (GTK_CONTAINER (parent), other_widget);
gtk_container_remove (GTK_CONTAINER (parent), GTK_WIDGET (widget));
gtk_container_remove (GTK_CONTAINER (grandparent), parent);
if (GTK_IS_PANED (grandparent))
gtk_paned_pack1 (GTK_PANED (grandparent), other_widget, TRUE, FALSE);
else
gtk_box_pack_start (GTK_BOX (paned_box), other_widget, TRUE, TRUE, 0);
g_object_unref (other_widget);
g_object_unref (widget);
}
}
/**
* gimp_paned_box_will_handle_drag:
* @paned_box: A #GimpPanedBox
* @widget: The widget that got the drag event
* @context: Context from drag event
* @x: x from drag event
* @y: y from drag event
* @time: time from drag event
*
* Returns: %TRUE if the drag event on @widget will be handled by
* @paned_box.
**/
gboolean
gimp_paned_box_will_handle_drag (GimpPanedBox *paned_box,
GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
gint time)
{
gint paned_box_x = 0;
gint paned_box_y = 0;
GtkAllocation allocation = { 0, };
GtkOrientation orientation = 0;
gboolean will_handle = FALSE;
gint drop_area_size = 0;
g_return_val_if_fail (paned_box == NULL ||
GIMP_IS_PANED_BOX (paned_box), FALSE);
/* Check for NULL to allow cleaner client code */
if (paned_box == NULL)
return FALSE;
/* Our handler might handle it */
if (gimp_paned_box_will_handle_drag (paned_box->p->drag_handler,
widget,
context,
x, y,
time))
{
/* Return TRUE so the client will pass on the drag event */
return TRUE;
}
/* If we don't have a common ancenstor we will not handle it */
if (! gtk_widget_translate_coordinates (widget,
GTK_WIDGET (paned_box),
x, y,
&paned_box_x, &paned_box_y))
{
/* Return FALSE so the client can take care of the drag event */
return FALSE;
}
/* We now have paned_box coordinates, see if the paned_box will
* handle the event
*/
gtk_widget_get_allocation (GTK_WIDGET (paned_box), &allocation);
orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (paned_box));
drop_area_size = gimp_paned_box_get_drop_area_size (paned_box);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
will_handle = (paned_box_x < drop_area_size ||
paned_box_x > allocation.width - drop_area_size);
}
else /*if (orientation = GTK_ORIENTATION_VERTICAL)*/
{
will_handle = (paned_box_y < drop_area_size ||
paned_box_y > allocation.height - drop_area_size);
}
return will_handle;
}
void
gimp_paned_box_set_drag_handler (GimpPanedBox *paned_box,
GimpPanedBox *drag_handler)
{
g_return_if_fail (GIMP_IS_PANED_BOX (paned_box));
paned_box->p->drag_handler = drag_handler;
}
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