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gimp/app/widgets/gimpview.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpview.c
* Copyright (C) 2001-2006 Michael Natterer <mitch@gimp.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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimpcontext.h"
#include "core/gimpmarshal.h"
#include "core/gimpviewable.h"
#include "gimpdnd.h"
#include "gimpview.h"
#include "gimpview-popup.h"
#include "gimpviewrenderer.h"
#include "gimpviewrenderer-utils.h"
enum
{
SET_VIEWABLE,
CLICKED,
DOUBLE_CLICKED,
CONTEXT,
LAST_SIGNAL
};
static void gimp_view_dispose (GObject *object);
static void gimp_view_realize (GtkWidget *widget);
static void gimp_view_unrealize (GtkWidget *widget);
static void gimp_view_map (GtkWidget *widget);
static void gimp_view_unmap (GtkWidget *widget);
static void gimp_view_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gimp_view_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_view_expose_event (GtkWidget *widget,
GdkEventExpose *event);
static gboolean gimp_view_button_press_event (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_view_button_release_event (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_view_enter_notify_event (GtkWidget *widget,
GdkEventCrossing *event);
static gboolean gimp_view_leave_notify_event (GtkWidget *widget,
GdkEventCrossing *event);
static void gimp_view_real_set_viewable (GimpView *view,
GimpViewable *old,
GimpViewable *viewable);
static void gimp_view_update_callback (GimpViewRenderer *renderer,
GimpView *view);
static GimpViewable * gimp_view_drag_viewable (GtkWidget *widget,
GimpContext **context,
gpointer data);
static GdkPixbuf * gimp_view_drag_pixbuf (GtkWidget *widget,
gpointer data);
G_DEFINE_TYPE (GimpView, gimp_view, GTK_TYPE_WIDGET)
#define parent_class gimp_view_parent_class
static guint view_signals[LAST_SIGNAL] = { 0 };
static void
gimp_view_class_init (GimpViewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
view_signals[SET_VIEWABLE] =
g_signal_new ("set-viewable",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpViewClass, set_viewable),
NULL, NULL,
gimp_marshal_VOID__OBJECT_OBJECT,
G_TYPE_NONE, 2,
GIMP_TYPE_VIEWABLE, GIMP_TYPE_VIEWABLE);
view_signals[CLICKED] =
g_signal_new ("clicked",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpViewClass, clicked),
NULL, NULL,
gimp_marshal_VOID__FLAGS,
G_TYPE_NONE, 1,
GDK_TYPE_MODIFIER_TYPE);
view_signals[DOUBLE_CLICKED] =
g_signal_new ("double-clicked",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpViewClass, double_clicked),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
view_signals[CONTEXT] =
g_signal_new ("context",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpViewClass, context),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->dispose = gimp_view_dispose;
widget_class->activate_signal = view_signals[CLICKED];
widget_class->realize = gimp_view_realize;
widget_class->unrealize = gimp_view_unrealize;
widget_class->map = gimp_view_map;
widget_class->unmap = gimp_view_unmap;
widget_class->size_request = gimp_view_size_request;
widget_class->size_allocate = gimp_view_size_allocate;
widget_class->expose_event = gimp_view_expose_event;
widget_class->button_press_event = gimp_view_button_press_event;
widget_class->button_release_event = gimp_view_button_release_event;
widget_class->enter_notify_event = gimp_view_enter_notify_event;
widget_class->leave_notify_event = gimp_view_leave_notify_event;
klass->set_viewable = gimp_view_real_set_viewable;
klass->clicked = NULL;
klass->double_clicked = NULL;
klass->context = NULL;
}
static void
gimp_view_init (GimpView *view)
{
gtk_widget_set_has_window (GTK_WIDGET (view), FALSE);
gtk_widget_add_events (GTK_WIDGET (view),
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_ENTER_NOTIFY_MASK |
GDK_LEAVE_NOTIFY_MASK);
view->event_window = NULL;
view->viewable = NULL;
view->renderer = NULL;
view->clickable = FALSE;
view->eat_button_events = TRUE;
view->show_popup = FALSE;
view->expand = FALSE;
view->in_button = FALSE;
view->has_grab = FALSE;
view->press_state = 0;
}
static void
gimp_view_dispose (GObject *object)
{
GimpView *view = GIMP_VIEW (object);
if (view->viewable)
gimp_view_set_viewable (view, NULL);
if (view->renderer)
{
g_object_unref (view->renderer);
view->renderer = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_view_realize (GtkWidget *widget)
{
GimpView *view = GIMP_VIEW (widget);
GtkAllocation allocation;
GdkWindowAttr attributes;
gint attributes_mask;
GTK_WIDGET_CLASS (parent_class)->realize (widget);
gtk_widget_get_allocation (widget, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.wclass = GDK_INPUT_ONLY;
attributes.event_mask = gtk_widget_get_events (widget);
attributes_mask = GDK_WA_X | GDK_WA_Y;
view->event_window = gdk_window_new (gtk_widget_get_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (view->event_window, view);
}
static void
gimp_view_unrealize (GtkWidget *widget)
{
GimpView *view = GIMP_VIEW (widget);
if (view->event_window)
{
gdk_window_set_user_data (view->event_window, NULL);
gdk_window_destroy (view->event_window);
view->event_window = NULL;
}
GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
}
static void
gimp_view_map (GtkWidget *widget)
{
GimpView *view = GIMP_VIEW (widget);
GTK_WIDGET_CLASS (parent_class)->map (widget);
if (view->event_window)
gdk_window_show (view->event_window);
}
static void
gimp_view_unmap (GtkWidget *widget)
{
GimpView *view = GIMP_VIEW (widget);
if (view->has_grab)
{
gtk_grab_remove (widget);
view->has_grab = FALSE;
}
if (view->event_window)
gdk_window_hide (view->event_window);
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}
static void
gimp_view_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GimpView *view = GIMP_VIEW (widget);
if (view->expand)
{
requisition->width = 2 * view->renderer->border_width + 1;
requisition->height = 2 * view->renderer->border_width + 1;
}
else
{
requisition->width = (view->renderer->width +
2 * view->renderer->border_width);
requisition->height = (view->renderer->height +
2 * view->renderer->border_width);
}
}
static void
gimp_view_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpView *view = GIMP_VIEW (widget);
gint width;
gint height;
if (view->expand)
{
width = MIN (GIMP_VIEWABLE_MAX_PREVIEW_SIZE,
allocation->width - 2 * view->renderer->border_width);
height = MIN (GIMP_VIEWABLE_MAX_PREVIEW_SIZE,
allocation->height - 2 * view->renderer->border_width);
if (view->renderer->width != width ||
view->renderer->height != height)
{
gint border_width = view->renderer->border_width;
if (view->renderer->size != -1 && view->renderer->viewable)
{
gint view_width;
gint view_height;
gint scaled_width;
gint scaled_height;
gimp_viewable_get_preview_size (view->renderer->viewable,
GIMP_VIEWABLE_MAX_PREVIEW_SIZE,
view->renderer->is_popup,
view->renderer->dot_for_dot,
&view_width,
&view_height);
gimp_viewable_calc_preview_size (view_width, view_height,
width, height,
TRUE, 1.0, 1.0,
&scaled_width, &scaled_height,
NULL);
if (scaled_width > width)
{
scaled_height = scaled_height * width / scaled_width;
scaled_width = scaled_width * width / scaled_width;
}
else if (scaled_height > height)
{
scaled_width = scaled_width * height / scaled_height;
scaled_height = scaled_height * height / scaled_height;
}
gimp_view_renderer_set_size (view->renderer,
MAX (scaled_width, scaled_height),
border_width);
}
else
{
gimp_view_renderer_set_size_full (view->renderer,
width, height,
border_width);
}
gimp_view_renderer_remove_idle (view->renderer);
}
}
width = (view->renderer->width +
2 * view->renderer->border_width);
height = (view->renderer->height +
2 * view->renderer->border_width);
if (allocation->width > width)
allocation->x += (allocation->width - width) / 2;
if (allocation->height > height)
allocation->y += (allocation->height - height) / 2;
allocation->width = width;
allocation->height = height;
gtk_widget_set_allocation (widget, allocation);
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (view->event_window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
}
static gboolean
gimp_view_expose_event (GtkWidget *widget,
GdkEventExpose *event)
{
if (gtk_widget_is_drawable (widget))
{
GtkAllocation allocation;
cairo_t *cr;
gtk_widget_get_allocation (widget, &allocation);
cr = gdk_cairo_create (event->window);
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
cairo_translate (cr, allocation.x, allocation.y);
gimp_view_renderer_draw (GIMP_VIEW (widget)->renderer,
widget, cr,
allocation.width,
allocation.height);
cairo_destroy (cr);
}
return FALSE;
}
#define DEBUG_MEMSIZE 1
#ifdef DEBUG_MEMSIZE
extern gboolean gimp_debug_memsize;
#endif
static gboolean
gimp_view_button_press_event (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpView *view = GIMP_VIEW (widget);
#ifdef DEBUG_MEMSIZE
if (bevent->type == GDK_BUTTON_PRESS && bevent->button == 2)
{
gimp_debug_memsize = TRUE;
gimp_object_get_memsize (GIMP_OBJECT (view->viewable), NULL);
gimp_debug_memsize = FALSE;
}
#endif /* DEBUG_MEMSIZE */
if (! view->clickable &&
! view->show_popup)
return FALSE;
if (! gtk_widget_get_realized (widget))
return FALSE;
if (bevent->type == GDK_BUTTON_PRESS)
{
if (gdk_event_triggers_context_menu ((GdkEvent *) bevent))
{
view->press_state = 0;
g_signal_emit (widget, view_signals[CONTEXT], 0);
}
else if (bevent->button == 1)
{
gtk_grab_add (widget);
view->has_grab = TRUE;
view->press_state = bevent->state;
if (view->show_popup && view->viewable)
{
gimp_view_popup_show (widget, bevent,
view->renderer->context,
view->viewable,
view->renderer->width,
view->renderer->height,
view->renderer->dot_for_dot);
}
}
else
{
view->press_state = 0;
if (bevent->button == 2)
gimp_view_popup_show (widget, bevent,
view->renderer->context,
view->viewable,
view->renderer->width,
view->renderer->height,
view->renderer->dot_for_dot);
return FALSE;
}
}
else if (bevent->type == GDK_2BUTTON_PRESS)
{
if (bevent->button == 1)
g_signal_emit (widget, view_signals[DOUBLE_CLICKED], 0);
}
return view->eat_button_events ? TRUE : FALSE;
}
static gboolean
gimp_view_button_release_event (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpView *view = GIMP_VIEW (widget);
if (! view->clickable &&
! view->show_popup)
return FALSE;
if (bevent->button == 1)
{
gtk_grab_remove (widget);
view->has_grab = FALSE;
if (view->clickable && view->in_button)
{
g_signal_emit (widget, view_signals[CLICKED], 0, view->press_state);
}
}
else
{
return FALSE;
}
return view->eat_button_events ? TRUE : FALSE;
}
static gboolean
gimp_view_enter_notify_event (GtkWidget *widget,
GdkEventCrossing *event)
{
GimpView *view = GIMP_VIEW (widget);
GtkWidget *event_widget = gtk_get_event_widget ((GdkEvent *) event);
if ((event_widget == widget) &&
(event->detail != GDK_NOTIFY_INFERIOR))
{
view->in_button = TRUE;
}
return FALSE;
}
static gboolean
gimp_view_leave_notify_event (GtkWidget *widget,
GdkEventCrossing *event)
{
GimpView *view = GIMP_VIEW (widget);
GtkWidget *event_widget = gtk_get_event_widget ((GdkEvent *) event);
if ((event_widget == widget) &&
(event->detail != GDK_NOTIFY_INFERIOR))
{
view->in_button = FALSE;
}
return FALSE;
}
static void
gimp_view_real_set_viewable (GimpView *view,
GimpViewable *old,
GimpViewable *viewable)
{
GType viewable_type = G_TYPE_NONE;
if (viewable == view->viewable)
return;
if (viewable)
{
viewable_type = G_TYPE_FROM_INSTANCE (viewable);
g_return_if_fail (g_type_is_a (viewable_type,
view->renderer->viewable_type));
}
if (view->viewable)
{
g_object_remove_weak_pointer (G_OBJECT (view->viewable),
(gpointer) &view->viewable);
if (! viewable && ! view->renderer->is_popup)
{
if (gimp_dnd_viewable_source_remove (GTK_WIDGET (view),
G_TYPE_FROM_INSTANCE (view->viewable)))
{
if (gimp_viewable_get_size (view->viewable, NULL, NULL))
gimp_dnd_pixbuf_source_remove (GTK_WIDGET (view));
gtk_drag_source_unset (GTK_WIDGET (view));
}
}
}
else if (viewable && ! view->renderer->is_popup)
{
if (gimp_dnd_drag_source_set_by_type (GTK_WIDGET (view),
GDK_BUTTON1_MASK | GDK_BUTTON2_MASK,
viewable_type,
GDK_ACTION_COPY))
{
gimp_dnd_viewable_source_add (GTK_WIDGET (view),
viewable_type,
gimp_view_drag_viewable,
NULL);
if (gimp_viewable_get_size (viewable, NULL, NULL))
gimp_dnd_pixbuf_source_add (GTK_WIDGET (view),
gimp_view_drag_pixbuf,
NULL);
}
}
gimp_view_renderer_set_viewable (view->renderer, viewable);
view->viewable = viewable;
if (view->viewable)
{
g_object_add_weak_pointer (G_OBJECT (view->viewable),
(gpointer) &view->viewable);
}
}
/* public functions */
GtkWidget *
gimp_view_new (GimpContext *context,
GimpViewable *viewable,
gint size,
gint border_width,
gboolean is_popup)
{
GtkWidget *view;
g_return_val_if_fail (context == NULL || GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
view = gimp_view_new_by_types (context,
GIMP_TYPE_VIEW,
G_TYPE_FROM_INSTANCE (viewable),
size, border_width, is_popup);
if (view)
gimp_view_set_viewable (GIMP_VIEW (view), viewable);
gimp_view_renderer_remove_idle (GIMP_VIEW (view)->renderer);
return view;
}
GtkWidget *
gimp_view_new_full (GimpContext *context,
GimpViewable *viewable,
gint width,
gint height,
gint border_width,
gboolean is_popup,
gboolean clickable,
gboolean show_popup)
{
GtkWidget *view;
g_return_val_if_fail (context == NULL || GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
view = gimp_view_new_full_by_types (context,
GIMP_TYPE_VIEW,
G_TYPE_FROM_INSTANCE (viewable),
width, height, border_width,
is_popup, clickable, show_popup);
if (view)
gimp_view_set_viewable (GIMP_VIEW (view), viewable);
gimp_view_renderer_remove_idle (GIMP_VIEW (view)->renderer);
return view;
}
GtkWidget *
gimp_view_new_by_types (GimpContext *context,
GType view_type,
GType viewable_type,
gint size,
gint border_width,
gboolean is_popup)
{
GimpViewRenderer *renderer;
GimpView *view;
g_return_val_if_fail (context == NULL || GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (g_type_is_a (view_type, GIMP_TYPE_VIEW), NULL);
g_return_val_if_fail (g_type_is_a (viewable_type, GIMP_TYPE_VIEWABLE), NULL);
g_return_val_if_fail (size > 0 &&
size <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE, NULL);
g_return_val_if_fail (border_width >= 0 &&
border_width <= GIMP_VIEW_MAX_BORDER_WIDTH, NULL);
renderer = gimp_view_renderer_new (context, viewable_type, size,
border_width, is_popup);
g_return_val_if_fail (renderer != NULL, NULL);
view = g_object_new (view_type, NULL);
g_signal_connect (renderer, "update",
G_CALLBACK (gimp_view_update_callback),
view);
view->renderer = renderer;
return GTK_WIDGET (view);
}
GtkWidget *
gimp_view_new_full_by_types (GimpContext *context,
GType view_type,
GType viewable_type,
gint width,
gint height,
gint border_width,
gboolean is_popup,
gboolean clickable,
gboolean show_popup)
{
GimpViewRenderer *renderer;
GimpView *view;
g_return_val_if_fail (context == NULL || GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (g_type_is_a (view_type, GIMP_TYPE_VIEW), NULL);
g_return_val_if_fail (g_type_is_a (viewable_type, GIMP_TYPE_VIEWABLE), NULL);
g_return_val_if_fail (width > 0 &&
width <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE, NULL);
g_return_val_if_fail (height > 0 &&
height <= GIMP_VIEWABLE_MAX_PREVIEW_SIZE, NULL);
g_return_val_if_fail (border_width >= 0 &&
border_width <= GIMP_VIEW_MAX_BORDER_WIDTH, NULL);
renderer = gimp_view_renderer_new_full (context, viewable_type,
width, height, border_width,
is_popup);
g_return_val_if_fail (renderer != NULL, NULL);
view = g_object_new (view_type, NULL);
g_signal_connect (renderer, "update",
G_CALLBACK (gimp_view_update_callback),
view);
view->renderer = renderer;
view->clickable = clickable ? TRUE : FALSE;
view->show_popup = show_popup ? TRUE : FALSE;
return GTK_WIDGET (view);
}
GimpViewable *
gimp_view_get_viewable (GimpView *view)
{
g_return_val_if_fail (GIMP_IS_VIEW (view), NULL);
return view->viewable;
}
void
gimp_view_set_viewable (GimpView *view,
GimpViewable *viewable)
{
g_return_if_fail (GIMP_IS_VIEW (view));
g_return_if_fail (viewable == NULL || GIMP_IS_VIEWABLE (viewable));
if (viewable == view->viewable)
return;
g_signal_emit (view, view_signals[SET_VIEWABLE], 0, view->viewable, viewable);
}
void
gimp_view_set_expand (GimpView *view,
gboolean expand)
{
g_return_if_fail (GIMP_IS_VIEW (view));
if (view->expand != expand)
{
view->expand = expand ? TRUE : FALSE;
gtk_widget_queue_resize (GTK_WIDGET (view));
}
}
/* private functions */
static void
gimp_view_update_callback (GimpViewRenderer *renderer,
GimpView *view)
{
GtkWidget *widget = GTK_WIDGET (view);
GtkRequisition requisition;
gint width;
gint height;
gtk_widget_get_requisition (widget, &requisition);
width = renderer->width + 2 * renderer->border_width;
height = renderer->height + 2 * renderer->border_width;
if (width != requisition.width ||
height != requisition.height)
{
gtk_widget_queue_resize (widget);
}
else
{
gtk_widget_queue_draw (widget);
}
}
static GimpViewable *
gimp_view_drag_viewable (GtkWidget *widget,
GimpContext **context,
gpointer data)
{
if (context)
*context = GIMP_VIEW (widget)->renderer->context;
return GIMP_VIEW (widget)->viewable;
}
static GdkPixbuf *
gimp_view_drag_pixbuf (GtkWidget *widget,
gpointer data)
{
GimpView *view = GIMP_VIEW (widget);
GimpViewable *viewable = view->viewable;
gint width;
gint height;
if (viewable && gimp_viewable_get_size (viewable, &width, &height))
return gimp_viewable_get_new_pixbuf (viewable, view->renderer->context,
width, height);
return NULL;
}
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