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gimp/app/widgets/gimpnavigationpreview.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpNavigationPreview Widget
* Copyright (C) 2001-2002 Michael Natterer <mitch@gimp.org>
*
* partly based on app/nav_window
* Copyright (C) 1999 Andy Thomas <alt@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 <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpmath/gimpmath.h"
#include "widgets-types.h"
#include "core/gimpimage.h"
#include "core/gimpmarshal.h"
#include "gimpnavigationpreview.h"
#include "gimppreviewrenderer.h"
#define BORDER_PEN_WIDTH 3
enum
{
MARKER_CHANGED,
ZOOM,
SCROLL,
LAST_SIGNAL
};
static void gimp_navigation_preview_class_init (GimpNavigationPreviewClass *klass);
static void gimp_navigation_preview_init (GimpNavigationPreview *preview);
static void gimp_navigation_preview_destroy (GtkObject *object);
static void gimp_navigation_preview_realize (GtkWidget *widget);
static void gimp_navigation_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_navigation_preview_expose (GtkWidget *widget,
GdkEventExpose *eevent);
static gboolean gimp_navigation_preview_button_press (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_navigation_preview_button_release (GtkWidget *widget,
GdkEventButton *bevent);
static gboolean gimp_navigation_preview_scroll (GtkWidget *widget,
GdkEventScroll *sevent);
static gboolean gimp_navigation_preview_motion_notify (GtkWidget *widget,
GdkEventMotion *mevent);
static gboolean gimp_navigation_preview_key_press (GtkWidget *widget,
GdkEventKey *kevent);
static void gimp_navigation_preview_transform (GimpNavigationPreview *nav_preview);
static void gimp_navigation_preview_draw_marker (GimpNavigationPreview *nav_preview,
GdkRectangle *area);
static guint preview_signals[LAST_SIGNAL] = { 0 };
static GimpPreviewClass *parent_class = NULL;
GType
gimp_navigation_preview_get_type (void)
{
static GType preview_type = 0;
if (! preview_type)
{
static const GTypeInfo preview_info =
{
sizeof (GimpNavigationPreviewClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gimp_navigation_preview_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpNavigationPreview),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_navigation_preview_init,
};
preview_type = g_type_register_static (GIMP_TYPE_PREVIEW,
"GimpNavigationPreview",
&preview_info, 0);
}
return preview_type;
}
static void
gimp_navigation_preview_class_init (GimpNavigationPreviewClass *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[MARKER_CHANGED] =
g_signal_new ("marker_changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpNavigationPreviewClass, marker_changed),
NULL, NULL,
gimp_marshal_VOID__DOUBLE_DOUBLE,
G_TYPE_NONE, 2,
G_TYPE_DOUBLE,
G_TYPE_DOUBLE);
preview_signals[ZOOM] =
g_signal_new ("zoom",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpNavigationPreviewClass, zoom),
NULL, NULL,
gimp_marshal_VOID__ENUM,
G_TYPE_NONE, 1,
GIMP_TYPE_ZOOM_TYPE);
preview_signals[SCROLL] =
g_signal_new ("scroll",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpNavigationPreviewClass, scroll),
NULL, NULL,
gimp_marshal_VOID__ENUM,
G_TYPE_NONE, 1,
GDK_TYPE_SCROLL_DIRECTION);
object_class->destroy = gimp_navigation_preview_destroy;
widget_class->realize = gimp_navigation_preview_realize;
widget_class->size_allocate = gimp_navigation_preview_size_allocate;
widget_class->expose_event = gimp_navigation_preview_expose;
widget_class->button_press_event = gimp_navigation_preview_button_press;
widget_class->button_release_event = gimp_navigation_preview_button_release;
widget_class->scroll_event = gimp_navigation_preview_scroll;
widget_class->motion_notify_event = gimp_navigation_preview_motion_notify;
widget_class->key_press_event = gimp_navigation_preview_key_press;
}
static void
gimp_navigation_preview_init (GimpNavigationPreview *preview)
{
GTK_WIDGET_SET_FLAGS (preview, GTK_CAN_FOCUS);
gtk_widget_add_events (GTK_WIDGET (preview), (GDK_POINTER_MOTION_MASK |
GDK_KEY_PRESS_MASK));
preview->x = 0.0;
preview->y = 0.0;
preview->width = 0.0;
preview->height = 0.0;
preview->p_x = 0;
preview->p_y = 0;
preview->p_width = 0;
preview->p_height = 0;
preview->motion_offset_x = 0;
preview->motion_offset_y = 0;
preview->has_grab = FALSE;
preview->gc = NULL;
}
static void
gimp_navigation_preview_destroy (GtkObject *object)
{
GimpNavigationPreview *nav_preview;
nav_preview = GIMP_NAVIGATION_PREVIEW (object);
if (nav_preview->gc)
{
g_object_unref (nav_preview->gc);
nav_preview->gc = NULL;
}
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gimp_navigation_preview_realize (GtkWidget *widget)
{
GimpNavigationPreview *nav_preview;
nav_preview = GIMP_NAVIGATION_PREVIEW (widget);
if (GTK_WIDGET_CLASS (parent_class)->realize)
GTK_WIDGET_CLASS (parent_class)->realize (widget);
nav_preview->gc = gdk_gc_new (widget->window);
gdk_gc_set_function (nav_preview->gc, GDK_INVERT);
gdk_gc_set_line_attributes (nav_preview->gc,
BORDER_PEN_WIDTH,
GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_ROUND);
}
static void
gimp_navigation_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
if (GIMP_PREVIEW (widget)->renderer->viewable)
gimp_navigation_preview_transform (GIMP_NAVIGATION_PREVIEW (widget));
}
static gboolean
gimp_navigation_preview_expose (GtkWidget *widget,
GdkEventExpose *eevent)
{
if (GTK_WIDGET_DRAWABLE (widget))
{
if (GTK_WIDGET_CLASS (parent_class)->expose_event)
GTK_WIDGET_CLASS (parent_class)->expose_event (widget, eevent);
gimp_navigation_preview_draw_marker (GIMP_NAVIGATION_PREVIEW (widget),
&eevent->area);
}
return TRUE;
}
static void
gimp_navigation_preview_move_to (GimpNavigationPreview *nav_preview,
gint tx,
gint ty)
{
GimpPreview *preview;
GimpImage *gimage;
gdouble ratiox, ratioy;
gdouble x, y;
preview = GIMP_PREVIEW (nav_preview);
if (! preview->renderer->viewable)
return;
tx = CLAMP (tx, 0, preview->renderer->width - nav_preview->p_width);
ty = CLAMP (ty, 0, preview->renderer->height - nav_preview->p_height);
gimage = GIMP_IMAGE (preview->renderer->viewable);
/* transform to image coordinates */
if (preview->renderer->width != nav_preview->p_width)
ratiox = ((gimage->width - nav_preview->width + 1.0) /
(preview->renderer->width - nav_preview->p_width));
else
ratiox = 1.0;
if (preview->renderer->height != nav_preview->p_height)
ratioy = ((gimage->height - nav_preview->height + 1.0) /
(preview->renderer->height - nav_preview->p_height));
else
ratioy = 1.0;
x = tx * ratiox;
y = ty * ratioy;
g_signal_emit (preview, preview_signals[MARKER_CHANGED], 0, x, y);
}
void
gimp_navigation_preview_grab_pointer (GimpNavigationPreview *nav_preview)
{
GtkWidget *widget;
GdkCursor *cursor;
GdkWindow *window;
widget = GTK_WIDGET (nav_preview);
nav_preview->has_grab = TRUE;
gtk_grab_add (widget);
cursor = gdk_cursor_new (GDK_FLEUR);
window = GIMP_PREVIEW (nav_preview)->event_window;
gdk_pointer_grab (window, TRUE,
GDK_BUTTON_RELEASE_MASK |
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON_MOTION_MASK |
GDK_EXTENSION_EVENTS_ALL,
window, cursor, 0);
gdk_cursor_unref (cursor);
}
static gboolean
gimp_navigation_preview_button_press (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpNavigationPreview *nav_preview;
gint tx, ty;
nav_preview = GIMP_NAVIGATION_PREVIEW (widget);
tx = bevent->x;
ty = bevent->y;
switch (bevent->button)
{
case 1:
if (! (tx > nav_preview->p_x &&
tx < (nav_preview->p_x + nav_preview->p_width) &&
ty > nav_preview->p_y &&
ty < (nav_preview->p_y + nav_preview->p_height)))
{
GdkCursor *cursor;
nav_preview->motion_offset_x = nav_preview->p_width / 2;
nav_preview->motion_offset_y = nav_preview->p_height / 2;
tx -= nav_preview->motion_offset_x;
ty -= nav_preview->motion_offset_y;
gimp_navigation_preview_move_to (nav_preview, tx, ty);
cursor = gdk_cursor_new (GDK_FLEUR);
gdk_window_set_cursor (GIMP_PREVIEW (widget)->event_window, cursor);
gdk_cursor_unref (cursor);
}
else
{
nav_preview->motion_offset_x = tx - nav_preview->p_x;
nav_preview->motion_offset_y = ty - nav_preview->p_y;
}
gimp_navigation_preview_grab_pointer (nav_preview);
break;
default:
break;
}
return TRUE;
}
static gboolean
gimp_navigation_preview_button_release (GtkWidget *widget,
GdkEventButton *bevent)
{
GimpNavigationPreview *nav_preview;
nav_preview = GIMP_NAVIGATION_PREVIEW (widget);
switch (bevent->button)
{
case 1:
nav_preview->has_grab = FALSE;
gtk_grab_remove (widget);
gdk_pointer_ungrab (0);
break;
default:
break;
}
return TRUE;
}
static gboolean
gimp_navigation_preview_scroll (GtkWidget *widget,
GdkEventScroll *sevent)
{
GimpNavigationPreview *nav_preview;
nav_preview = GIMP_NAVIGATION_PREVIEW (widget);
if (sevent->state & GDK_SHIFT_MASK)
{
if (sevent->direction == GDK_SCROLL_UP)
{
g_signal_emit (widget, preview_signals[ZOOM], 0, GIMP_ZOOM_IN);
}
else
{
g_signal_emit (widget, preview_signals[ZOOM], 0, GIMP_ZOOM_OUT);
}
}
else
{
GdkScrollDirection direction;
if (sevent->state & GDK_CONTROL_MASK)
{
if (sevent->direction == GDK_SCROLL_UP)
direction = GDK_SCROLL_LEFT;
else
direction = GDK_SCROLL_RIGHT;
}
else
{
direction = sevent->direction;
}
g_signal_emit (widget, preview_signals[SCROLL], 0, direction);
}
return TRUE;
}
static gboolean
gimp_navigation_preview_motion_notify (GtkWidget *widget,
GdkEventMotion *mevent)
{
GimpNavigationPreview *nav_preview;
GimpPreview *preview;
gint tx, ty;
GdkModifierType mask;
nav_preview = GIMP_NAVIGATION_PREVIEW (widget);
preview = GIMP_PREVIEW (widget);
if (! nav_preview->has_grab)
{
GdkCursor *cursor;
if (nav_preview->p_x == 0 &&
nav_preview->p_y == 0 &&
nav_preview->p_width == preview->renderer->width &&
nav_preview->p_height == preview->renderer->height)
{
gdk_window_set_cursor (preview->event_window, NULL);
return FALSE;
}
else if (mevent->x >= nav_preview->p_x &&
mevent->y >= nav_preview->p_y &&
mevent->x < nav_preview->p_x + nav_preview->p_width &&
mevent->y < nav_preview->p_y + nav_preview->p_height)
{
cursor = gdk_cursor_new (GDK_FLEUR);
}
else
{
cursor = gdk_cursor_new (GDK_HAND2);
}
gdk_window_set_cursor (preview->event_window, cursor);
gdk_cursor_unref (cursor);
return FALSE;
}
gdk_window_get_pointer (preview->event_window, &tx, &ty, &mask);
tx -= nav_preview->motion_offset_x;
ty -= nav_preview->motion_offset_y;
gimp_navigation_preview_move_to (nav_preview, tx, ty);
return TRUE;
}
static gboolean
gimp_navigation_preview_key_press (GtkWidget *widget,
GdkEventKey *kevent)
{
GimpNavigationPreview *nav_preview;
gint scroll_x = 0;
gint scroll_y = 0;
nav_preview = GIMP_NAVIGATION_PREVIEW (widget);
switch (kevent->keyval)
{
case GDK_Up:
scroll_y = -1;
break;
case GDK_Left:
scroll_x = -1;
break;
case GDK_Right:
scroll_x = 1;
break;
case GDK_Down:
scroll_y = 1;
break;
default:
break;
}
if (scroll_x || scroll_y)
{
gimp_navigation_preview_move_to (nav_preview,
nav_preview->p_x + scroll_x,
nav_preview->p_y + scroll_y);
return TRUE;
}
return FALSE;
}
static void
gimp_navigation_preview_transform (GimpNavigationPreview *nav_preview)
{
GimpPreview *preview;
GimpImage *gimage;
gdouble ratiox, ratioy;
preview = GIMP_PREVIEW (nav_preview);
gimage = GIMP_IMAGE (preview->renderer->viewable);
ratiox = ((gdouble) preview->renderer->width / (gdouble) gimage->width);
ratioy = ((gdouble) preview->renderer->height / (gdouble) gimage->height);
nav_preview->p_x = RINT (nav_preview->x * ratiox);
nav_preview->p_y = RINT (nav_preview->y * ratioy);
nav_preview->p_width = RINT (nav_preview->width * ratiox);
nav_preview->p_height = RINT (nav_preview->height * ratioy);
}
static void
gimp_navigation_preview_draw_marker (GimpNavigationPreview *nav_preview,
GdkRectangle *area)
{
GimpPreview *preview;
preview = GIMP_PREVIEW (nav_preview);
if (preview->renderer->viewable &&
nav_preview->width &&
nav_preview->height)
{
GimpImage *gimage;
gimage = GIMP_IMAGE (preview->renderer->viewable);
if (nav_preview->x > 0 ||
nav_preview->y > 0 ||
nav_preview->width < gimage->width ||
nav_preview->height < gimage->height)
{
GtkWidget *widget = GTK_WIDGET (preview);
if (area)
gdk_gc_set_clip_rectangle (nav_preview->gc, area);
gdk_draw_rectangle (widget->window, nav_preview->gc,
FALSE,
widget->allocation.x + nav_preview->p_x + 1,
widget->allocation.y + nav_preview->p_y + 1,
MAX (1, nav_preview->p_width - BORDER_PEN_WIDTH),
MAX (1, nav_preview->p_height - BORDER_PEN_WIDTH));
if (area)
gdk_gc_set_clip_rectangle (nav_preview->gc, NULL);
}
}
}
void
gimp_navigation_preview_set_marker (GimpNavigationPreview *nav_preview,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
GimpPreview *preview;
GimpImage *gimage;
g_return_if_fail (GIMP_IS_NAVIGATION_PREVIEW (nav_preview));
preview = GIMP_PREVIEW (nav_preview);
g_return_if_fail (preview->renderer->viewable);
gimage = GIMP_IMAGE (preview->renderer->viewable);
/* remove old marker */
if (GTK_WIDGET_DRAWABLE (preview))
gimp_navigation_preview_draw_marker (nav_preview, NULL);
nav_preview->x = CLAMP (x, 0.0, gimage->width - 1.0);
nav_preview->y = CLAMP (y, 0.0, gimage->height - 1.0);
if (width < 0.0)
width = gimage->width;
if (height < 0.0)
height = gimage->height;
nav_preview->width = CLAMP (width, 1.0, gimage->width - nav_preview->x);
nav_preview->height = CLAMP (height, 1.0, gimage->height - nav_preview->y);
gimp_navigation_preview_transform (nav_preview);
/* draw new marker */
if (GTK_WIDGET_DRAWABLE (preview))
gimp_navigation_preview_draw_marker (nav_preview, NULL);
}
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