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gimp/app/widgets/gimpview.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimppreview.c
* Copyright (C) 2001 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.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/gimpmarshal.h"
#include "core/gimpviewable.h"
#include "gimpdnd.h"
#include "gimppreview.h"
#include "gimppreview-popup.h"
#include "gimppreviewrenderer.h"
#include "gimppreviewrenderer-utils.h"
#define PREVIEW_EVENT_MASK (GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_ENTER_NOTIFY_MASK | \
GDK_LEAVE_NOTIFY_MASK)
enum
{
CLICKED,
DOUBLE_CLICKED,
CONTEXT,
LAST_SIGNAL
};
static void gimp_preview_class_init (GimpPreviewClass *klass);
static void gimp_preview_init (GimpPreview *preview);
static void gimp_preview_destroy (GtkObject *object);
static void gimp_preview_realize (GtkWidget *widget);
static void gimp_preview_unrealize (GtkWidget *widget);
static void gimp_preview_map (GtkWidget *widget);
static void gimp_preview_unmap (GtkWidget *widget);
static void gimp_preview_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gimp_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_preview_expose_event (GtkWidget *widget,
GdkEventExpose *event);
static gboolean gimp_preview_button_press_event (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_preview_button_release_event (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_preview_enter_notify_event (GtkWidget *widget,
GdkEventCrossing *event);
static gboolean gimp_preview_leave_notify_event (GtkWidget *widget,
GdkEventCrossing *event);
static void gimp_preview_update_callback (GimpPreviewRenderer *renderer,
GimpPreview *preview);
static GimpViewable * gimp_preview_drag_viewable (GtkWidget *widget,
gpointer data);
static guint preview_signals[LAST_SIGNAL] = { 0 };
static GtkWidgetClass *parent_class = NULL;
GType
gimp_preview_get_type (void)
{
static GType preview_type = 0;
if (! preview_type)
{
static const GTypeInfo preview_info =
{
sizeof (GimpPreviewClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gimp_preview_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPreview),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_preview_init,
};
preview_type = g_type_register_static (GTK_TYPE_WIDGET,
"GimpPreview",
&preview_info, 0);
}
return preview_type;
}
static void
gimp_preview_class_init (GimpPreviewClass *klass)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = GTK_OBJECT_CLASS (klass);
widget_class = GTK_WIDGET_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
preview_signals[CLICKED] =
g_signal_new ("clicked",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPreviewClass, clicked),
NULL, NULL,
gimp_marshal_VOID__FLAGS,
G_TYPE_NONE, 1,
GDK_TYPE_MODIFIER_TYPE);
preview_signals[DOUBLE_CLICKED] =
g_signal_new ("double_clicked",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPreviewClass, double_clicked),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
preview_signals[CONTEXT] =
g_signal_new ("context",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPreviewClass, context),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->destroy = gimp_preview_destroy;
widget_class->activate_signal = preview_signals[CLICKED];
widget_class->realize = gimp_preview_realize;
widget_class->unrealize = gimp_preview_unrealize;
widget_class->map = gimp_preview_map;
widget_class->unmap = gimp_preview_unmap;
widget_class->size_request = gimp_preview_size_request;
widget_class->size_allocate = gimp_preview_size_allocate;
widget_class->expose_event = gimp_preview_expose_event;
widget_class->button_press_event = gimp_preview_button_press_event;
widget_class->button_release_event = gimp_preview_button_release_event;
widget_class->enter_notify_event = gimp_preview_enter_notify_event;
widget_class->leave_notify_event = gimp_preview_leave_notify_event;
klass->clicked = NULL;
klass->double_clicked = NULL;
klass->context = NULL;
}
static void
gimp_preview_init (GimpPreview *preview)
{
GTK_WIDGET_SET_FLAGS (preview, GTK_NO_WINDOW);
preview->viewable = NULL;
preview->renderer = NULL;
preview->clickable = FALSE;
preview->eat_button_events = TRUE;
preview->show_popup = FALSE;
preview->expand = FALSE;
preview->in_button = FALSE;
}
static void
gimp_preview_destroy (GtkObject *object)
{
GimpPreview *preview;
preview = GIMP_PREVIEW (object);
if (preview->viewable)
gimp_preview_set_viewable (preview, NULL);
if (preview->renderer)
{
g_object_unref (preview->renderer);
preview->renderer = NULL;
}
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gimp_preview_realize (GtkWidget *widget)
{
GimpPreview *preview;
GdkWindowAttr attributes;
gint attributes_mask;
preview = GIMP_PREVIEW (widget);
GTK_WIDGET_CLASS (parent_class)->realize (widget);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.wclass = GDK_INPUT_ONLY;
attributes.event_mask = gtk_widget_get_events (widget);
attributes.event_mask |= PREVIEW_EVENT_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y;
preview->event_window = gdk_window_new (widget->window,
&attributes, attributes_mask);
gdk_window_set_user_data (preview->event_window, preview);
}
static void
gimp_preview_unrealize (GtkWidget *widget)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
if (preview->event_window)
{
gdk_window_set_user_data (preview->event_window, NULL);
gdk_window_destroy (preview->event_window);
preview->event_window = NULL;
}
if (preview->renderer)
gimp_preview_renderer_unrealize (preview->renderer);
GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
}
static void
gimp_preview_map (GtkWidget *widget)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
GTK_WIDGET_CLASS (parent_class)->map (widget);
if (preview->event_window)
gdk_window_show (preview->event_window);
}
static void
gimp_preview_unmap (GtkWidget *widget)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
if (preview->has_grab)
gtk_grab_remove (widget);
if (preview->event_window)
gdk_window_hide (preview->event_window);
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}
static void
gimp_preview_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GimpPreview *preview;
preview = GIMP_PREVIEW (widget);
if (preview->expand)
{
requisition->width = 2 * preview->renderer->border_width + 1;
requisition->height = 2 * preview->renderer->border_width + 1;
}
else
{
requisition->width = (preview->renderer->width +
2 * preview->renderer->border_width);
requisition->height = (preview->renderer->height +
2 * preview->renderer->border_width);
}
if (GTK_WIDGET_CLASS (parent_class)->size_request)
GTK_WIDGET_CLASS (parent_class)->size_request (widget, requisition);
}
static void
gimp_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpPreview *preview;
gint width;
gint height;
preview = GIMP_PREVIEW (widget);
if (preview->expand)
{
width = MIN (GIMP_VIEWABLE_MAX_PREVIEW_SIZE,
allocation->width - 2 * preview->renderer->border_width);
height = MIN (GIMP_VIEWABLE_MAX_PREVIEW_SIZE,
allocation->height - 2 * preview->renderer->border_width);
if (preview->renderer->width != width ||
preview->renderer->height != height)
{
gint border_width = preview->renderer->border_width;
if (preview->renderer->size != -1 && preview->renderer->viewable)
{
gint preview_width;
gint preview_height;
gint scaled_width;
gint scaled_height;
gimp_viewable_get_preview_size (preview->renderer->viewable,
GIMP_VIEWABLE_MAX_PREVIEW_SIZE,
preview->renderer->is_popup,
preview->renderer->dot_for_dot,
&preview_width,
&preview_height);
gimp_viewable_calc_preview_size (preview_width, preview_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_preview_renderer_set_size (preview->renderer,
MAX (scaled_width, scaled_height),
border_width);
}
else
{
gimp_preview_renderer_set_size_full (preview->renderer,
width, height,
border_width);
}
gimp_preview_renderer_remove_idle (preview->renderer);
}
}
width = (preview->renderer->width +
2 * preview->renderer->border_width);
height = (preview->renderer->height +
2 * preview->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;
widget->allocation = *allocation;
if (GTK_WIDGET_REALIZED (widget))
gdk_window_move_resize (preview->event_window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
}
static gboolean
gimp_preview_expose_event (GtkWidget *widget,
GdkEventExpose *event)
{
if (! GTK_WIDGET_DRAWABLE (widget))
return FALSE;
gimp_preview_renderer_draw (GIMP_PREVIEW (widget)->renderer,
widget->window, widget,
&widget->allocation,
&event->area);
return FALSE;
}
#define DEBUG_MEMSIZE 1
#ifdef DEBUG_MEMSIZE
extern gboolean gimp_debug_memsize;
#endif
static gboolean
gimp_preview_button_press_event (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpPreview *preview;
preview = GIMP_PREVIEW (widget);
#ifdef DEBUG_MEMSIZE
if (bevent->type == GDK_BUTTON_PRESS && bevent->button == 2)
{
gimp_debug_memsize = TRUE;
gimp_object_get_memsize (GIMP_OBJECT (preview->viewable), NULL);
gimp_debug_memsize = FALSE;
}
#endif /* DEBUG_MEMSIZE */
if (! preview->clickable &&
! preview->show_popup)
return FALSE;
if (! GTK_WIDGET_REALIZED (widget))
return FALSE;
if (bevent->type == GDK_BUTTON_PRESS)
{
if (bevent->button == 1)
{
gtk_grab_add (widget);
preview->has_grab = TRUE;
preview->press_state = bevent->state;
if (preview->show_popup && preview->viewable)
{
gimp_preview_popup_show (widget, bevent,
preview->viewable,
preview->renderer->width,
preview->renderer->height,
preview->renderer->dot_for_dot);
}
}
else
{
preview->press_state = 0;
if (bevent->button == 2)
gimp_preview_popup_show (widget, bevent,
preview->viewable,
preview->renderer->width,
preview->renderer->height,
preview->renderer->dot_for_dot);
if (bevent->button == 3)
g_signal_emit (widget, preview_signals[CONTEXT], 0);
else
return FALSE;
}
}
else if (bevent->type == GDK_2BUTTON_PRESS)
{
if (bevent->button == 1)
g_signal_emit (widget, preview_signals[DOUBLE_CLICKED], 0);
}
return preview->eat_button_events ? TRUE : FALSE;
}
static gboolean
gimp_preview_button_release_event (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpPreview *preview;
preview = GIMP_PREVIEW (widget);
if (! preview->clickable &&
! preview->show_popup)
return FALSE;
if (bevent->button == 1)
{
gtk_grab_remove (widget);
preview->has_grab = FALSE;
if (preview->clickable && preview->in_button)
{
g_signal_emit (widget, preview_signals[CLICKED], 0,
preview->press_state);
}
}
else
{
return FALSE;
}
return preview->eat_button_events ? TRUE : FALSE;
}
static gboolean
gimp_preview_enter_notify_event (GtkWidget *widget,
GdkEventCrossing *event)
{
GimpPreview *preview;
GtkWidget *event_widget;
preview = GIMP_PREVIEW (widget);
event_widget = gtk_get_event_widget ((GdkEvent *) event);
if ((event_widget == widget) &&
(event->detail != GDK_NOTIFY_INFERIOR))
{
preview->in_button = TRUE;
}
return FALSE;
}
static gboolean
gimp_preview_leave_notify_event (GtkWidget *widget,
GdkEventCrossing *event)
{
GimpPreview *preview;
GtkWidget *event_widget;
preview = GIMP_PREVIEW (widget);
event_widget = gtk_get_event_widget ((GdkEvent *) event);
if ((event_widget == widget) &&
(event->detail != GDK_NOTIFY_INFERIOR))
{
preview->in_button = FALSE;
}
return FALSE;
}
/* public functions */
GtkWidget *
gimp_preview_new (GimpViewable *viewable,
gint size,
gint border_width,
gboolean is_popup)
{
GtkWidget *preview;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
preview = gimp_preview_new_by_types (GIMP_TYPE_PREVIEW,
G_TYPE_FROM_INSTANCE (viewable),
size, border_width, is_popup);
if (preview)
gimp_preview_set_viewable (GIMP_PREVIEW (preview), viewable);
gimp_preview_renderer_remove_idle (GIMP_PREVIEW (preview)->renderer);
return preview;
}
GtkWidget *
gimp_preview_new_full (GimpViewable *viewable,
gint width,
gint height,
gint border_width,
gboolean is_popup,
gboolean clickable,
gboolean show_popup)
{
GtkWidget *preview;
g_return_val_if_fail (GIMP_IS_VIEWABLE (viewable), NULL);
preview = gimp_preview_new_full_by_types (GIMP_TYPE_PREVIEW,
G_TYPE_FROM_INSTANCE (viewable),
width, height, border_width,
is_popup, clickable, show_popup);
if (preview)
gimp_preview_set_viewable (GIMP_PREVIEW (preview), viewable);
gimp_preview_renderer_remove_idle (GIMP_PREVIEW (preview)->renderer);
return preview;
}
GtkWidget *
gimp_preview_new_by_types (GType preview_type,
GType viewable_type,
gint size,
gint border_width,
gboolean is_popup)
{
GimpPreviewRenderer *renderer;
GimpPreview *preview;
g_return_val_if_fail (g_type_is_a (preview_type, GIMP_TYPE_PREVIEW), 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_PREVIEW_MAX_BORDER_WIDTH, NULL);
renderer = gimp_preview_renderer_new (viewable_type, size,
border_width, is_popup);
g_return_val_if_fail (renderer != NULL, NULL);
preview = g_object_new (preview_type, NULL);
g_signal_connect (renderer, "update",
G_CALLBACK (gimp_preview_update_callback),
preview);
preview->renderer = renderer;
return GTK_WIDGET (preview);
}
GtkWidget *
gimp_preview_new_full_by_types (GType preview_type,
GType viewable_type,
gint width,
gint height,
gint border_width,
gboolean is_popup,
gboolean clickable,
gboolean show_popup)
{
GimpPreviewRenderer *renderer;
GimpPreview *preview;
g_return_val_if_fail (g_type_is_a (preview_type, GIMP_TYPE_PREVIEW), 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_PREVIEW_MAX_BORDER_WIDTH, NULL);
renderer = gimp_preview_renderer_new_full (viewable_type, width, height,
border_width, is_popup);
g_return_val_if_fail (renderer != NULL, NULL);
preview = g_object_new (preview_type, NULL);
g_signal_connect (renderer, "update",
G_CALLBACK (gimp_preview_update_callback),
preview);
preview->renderer = renderer;
preview->clickable = clickable ? TRUE : FALSE;
preview->show_popup = show_popup ? TRUE : FALSE;
return GTK_WIDGET (preview);
}
void
gimp_preview_set_viewable (GimpPreview *preview,
GimpViewable *viewable)
{
GType viewable_type = G_TYPE_NONE;
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_return_if_fail (viewable == NULL || GIMP_IS_VIEWABLE (viewable));
if (viewable == preview->viewable)
return;
if (viewable)
{
viewable_type = G_TYPE_FROM_INSTANCE (viewable);
g_return_if_fail (g_type_is_a (viewable_type,
preview->renderer->viewable_type));
}
if (preview->viewable)
{
g_object_remove_weak_pointer (G_OBJECT (preview->viewable),
(gpointer *) &preview->viewable);
if (! viewable && ! preview->renderer->is_popup)
{
if (gimp_dnd_viewable_source_remove (GTK_WIDGET (preview),
G_TYPE_FROM_INSTANCE (preview->viewable)))
{
gtk_drag_source_unset (GTK_WIDGET (preview));
}
}
}
else if (viewable && ! preview->renderer->is_popup)
{
if (gimp_dnd_drag_source_set_by_type (GTK_WIDGET (preview),
GDK_BUTTON1_MASK | GDK_BUTTON2_MASK,
viewable_type,
GDK_ACTION_COPY))
{
gimp_dnd_viewable_source_add (GTK_WIDGET (preview),
viewable_type,
gimp_preview_drag_viewable,
NULL);
}
}
gimp_preview_renderer_set_viewable (preview->renderer, viewable);
preview->viewable = viewable;
if (preview->viewable)
{
g_object_add_weak_pointer (G_OBJECT (preview->viewable),
(gpointer *) &preview->viewable);
}
}
void
gimp_preview_set_expand (GimpPreview *preview,
gboolean expand)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
if (preview->expand != expand)
{
preview->expand = expand ? TRUE : FALSE;
gtk_widget_queue_resize (GTK_WIDGET (preview));
}
}
/* private functions */
static void
gimp_preview_update_callback (GimpPreviewRenderer *renderer,
GimpPreview *preview)
{
GtkWidget *widget;
gint width;
gint height;
widget = GTK_WIDGET (preview);
width = renderer->width + 2 * renderer->border_width;
height = renderer->height + 2 * renderer->border_width;
if (width != widget->requisition.width ||
height != widget->requisition.height)
{
widget->requisition.width = width;
widget->requisition.height = height;
gtk_widget_queue_resize (widget);
}
else
{
gtk_widget_queue_draw (widget);
}
}
static GimpViewable *
gimp_preview_drag_viewable (GtkWidget *widget,
gpointer data)
{
return GIMP_PREVIEW (widget)->viewable;
}
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