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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 "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimp.h"
#include "core/gimpcontext.h"
#include "core/gimpmarshal.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"
#include "gimp-intl.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 12
#define INSERT_INDEX_UNUSED G_MININT
#define INSTRUCTIONS_TEXT_PADDING 6
#define INSTRUCTIONS_TEXT _("You can drop dockable dialogs here")
struct _GimpPanedBoxPrivate
{
/* Widgets that are separated by panes */
GList *widgets;
/* Displays INSTRUCTIONS_TEXT when there are no dockables */
GtkWidget *instructions;
/* Is the DND highlight shown */
gboolean dnd_highlight;
GdkRectangle dnd_rectangle;
/* 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);
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 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);
/* Instructions label
*
* Size a small size request so it don't mess up dock window layouts
* during startup; in particular, set its height request to 0 so it
* doesn't contribute to the minimum height of the toolbox.
*/
paned_box->p->instructions = gtk_label_new (INSTRUCTIONS_TEXT);
g_object_set (paned_box->p->instructions,
"margin-start", INSTRUCTIONS_TEXT_PADDING,
"margin-end", INSTRUCTIONS_TEXT_PADDING,
"margin-top", INSTRUCTIONS_TEXT_PADDING,
"margin-bottom", INSTRUCTIONS_TEXT_PADDING,
NULL);
gtk_label_set_line_wrap (GTK_LABEL (paned_box->p->instructions), TRUE);
gtk_label_set_justify (GTK_LABEL (paned_box->p->instructions),
GTK_JUSTIFY_CENTER);
gtk_widget_set_size_request (paned_box->p->instructions, 1, DROP_AREA_SIZE);
gimp_label_set_attributes (GTK_LABEL (paned_box->p->instructions),
PANGO_ATTR_STYLE, PANGO_STYLE_ITALIC,
-1);
gtk_box_pack_start (GTK_BOX (paned_box), paned_box->p->instructions,
TRUE, TRUE, 0);
gtk_widget_show (paned_box->p->instructions);
/* Setup DND */
gtk_drag_dest_set (GTK_WIDGET (paned_box),
0,
dialog_target_table, G_N_ELEMENTS (dialog_target_table),
GDK_ACTION_MOVE);
}
static void
gimp_paned_box_dispose (GObject *object)
{
GimpPanedBox *paned_box = GIMP_PANED_BOX (object);
if (paned_box->p->dnd_highlight)
gimp_paned_box_hide_drop_indicator (paned_box);
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);
}
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_drop_indicator_draw (GtkWidget *widget,
cairo_t *cr,
gpointer data)
{
GimpPanedBox *paned_box = GIMP_PANED_BOX (widget);
cairo_set_source_rgba (cr, 0.0, 0.0, 1.0, 0.2);
cairo_rectangle (cr,
paned_box->p->dnd_rectangle.x + 0.5,
paned_box->p->dnd_rectangle.y + 0.5,
paned_box->p->dnd_rectangle.width - 1.0,
paned_box->p->dnd_rectangle.height - 1.0);
cairo_fill (cr);
return FALSE;
}
static void
gimp_paned_box_position_drop_indicator (GimpPanedBox *paned_box,
gint x,
gint y,
gint width,
gint height)
{
GtkWidget *widget = GTK_WIDGET (paned_box);
paned_box->p->dnd_rectangle.x = x;
paned_box->p->dnd_rectangle.y = y;
paned_box->p->dnd_rectangle.width = width;
paned_box->p->dnd_rectangle.height = height;
if (! paned_box->p->dnd_highlight)
{
g_signal_connect_after (widget, "draw",
G_CALLBACK (gimp_paned_box_drop_indicator_draw),
NULL);
paned_box->p->dnd_highlight = TRUE;
}
gtk_widget_queue_draw (widget);
}
static void
gimp_paned_box_hide_drop_indicator (GimpPanedBox *paned_box)
{
GtkWidget *widget = GTK_WIDGET (paned_box);
if (paned_box->p->dnd_highlight)
{
g_signal_handlers_disconnect_by_func (widget,
gimp_paned_box_drop_indicator_draw,
NULL);
paned_box->p->dnd_highlight = FALSE;
}
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));
}
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 = INSERT_INDEX_UNUSED;
gint dnd_window_x;
gint dnd_window_y;
gint dnd_window_w;
gint dnd_window_h;
GtkAllocation allocation;
GtkOrientation orientation;
gboolean handle;
gint drop_area_size;
if (gimp_paned_box_will_handle_drag (paned_box->p->drag_handler,
widget,
context,
x, y,
time))
{
gdk_drag_status (context, 0, time);
return FALSE;
}
drop_area_size = gimp_paned_box_get_drop_area_size (paned_box);
gtk_widget_get_allocation (widget, &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)
{
dnd_window_y = 0;
dnd_window_h = allocation.height;
/* If there are no widgets, the drop area is as big as the paned
* box
*/
if (! paned_box->p->widgets)
dnd_window_w = allocation.width;
else
dnd_window_w = drop_area_size;
if (x < drop_area_size)
{
insert_index = 0;
dnd_window_x = 0;
}
if (x > allocation.width - drop_area_size)
{
insert_index = -1;
dnd_window_x = allocation.width - drop_area_size;
}
}
else /* if (orientation = GTK_ORIENTATION_VERTICAL) */
{
dnd_window_x = 0;
dnd_window_w = allocation.width;
/* If there are no widgets, the drop area is as big as the paned
* box
*/
if (! paned_box->p->widgets)
dnd_window_h = allocation.height;
else
dnd_window_h = drop_area_size;
if (y < drop_area_size)
{
insert_index = 0;
dnd_window_y = 0;
}
if (y > allocation.height - drop_area_size)
{
insert_index = -1;
dnd_window_y = allocation.height - drop_area_size;
}
}
/* If we are at the edge, show a GdkWindow to communicate that a
* drop will create a new dock column
*/
handle = (insert_index != INSERT_INDEX_UNUSED);
if (handle)
{
gimp_paned_box_position_drop_indicator (paned_box,
dnd_window_x,
dnd_window_y,
dnd_window_w,
dnd_window_h);
}
else
{
gimp_paned_box_hide_drop_indicator (paned_box);
}
/* 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 TRUE;
}
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);
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);
}
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);
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);
}
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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