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c6dd571113
2004-08-31 Sven Neumann <sven@gimp.org> * libgimpwidgets/gimppreview.c: removed the hardcoded preview size, removed some redundant assertions.
505 lines
15 KiB
C
505 lines
15 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimppreview.c
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <gtk/gtk.h>
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#include "gimpwidgets.h"
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#include "gimppreview.h"
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#include "libgimp/libgimp-intl.h"
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enum
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{
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INVALIDATED,
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LAST_SIGNAL
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};
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enum
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{
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PROP_0,
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PROP_UPDATE,
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PROP_SHOW_UPDATE_TOGGLE
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};
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static void gimp_preview_class_init (GimpPreviewClass *klass);
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static void gimp_preview_init (GimpPreview *preview);
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static void gimp_preview_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void gimp_preview_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static gboolean gimp_preview_button_release (GtkWidget *hs,
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GdkEventButton *ev,
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GimpPreview *preview);
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static void gimp_preview_draw (GimpPreview *preview);
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static void gimp_preview_area_realize (GtkWidget *widget);
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static void gimp_preview_area_size_allocate (GimpPreview *preview);
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static void gimp_preview_h_scroll (GtkAdjustment *hadj,
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GimpPreview *preview);
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static void gimp_preview_v_scroll (GtkAdjustment *vadj,
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GimpPreview *preview);
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static gboolean gimp_preview_area_event (GtkWidget *area,
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GdkEvent *event,
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GimpPreview *preview);
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static void gimp_preview_toggle_callback (GtkWidget *toggle,
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GimpPreview *preview);
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static guint preview_signals[LAST_SIGNAL] = { 0 };
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static GtkTableClass *parent_class = NULL;
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GType
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gimp_preview_get_type (void)
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{
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static GType preview_type = 0;
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if (!preview_type)
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{
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static const GTypeInfo preview_info =
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{
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sizeof (GimpPreviewClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gimp_preview_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GimpPreview),
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0, /* n_preallocs */
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(GInstanceInitFunc) gimp_preview_init,
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};
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preview_type = g_type_register_static (GTK_TYPE_TABLE,
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"GimpPreview",
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&preview_info,
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G_TYPE_FLAG_ABSTRACT);
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}
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return preview_type;
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}
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static void
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gimp_preview_class_init (GimpPreviewClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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preview_signals[INVALIDATED] =
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g_signal_new ("invalidated",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GimpPreviewClass, invalidated),
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NULL, NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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object_class->get_property = gimp_preview_get_property;
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object_class->set_property = gimp_preview_set_property;
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g_object_class_install_property (object_class,
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PROP_UPDATE,
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g_param_spec_boolean ("update",
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NULL, NULL,
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TRUE,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class,
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PROP_SHOW_UPDATE_TOGGLE,
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g_param_spec_boolean ("show_update_toggle",
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NULL, NULL,
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FALSE,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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klass->draw = NULL;
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}
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static void
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gimp_preview_init (GimpPreview *preview)
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{
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GtkWidget *frame;
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preview->xoff = 0;
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preview->yoff = 0;
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preview->in_drag = FALSE;
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preview->update_preview = TRUE;
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preview->xmin = preview->ymin = 0;
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preview->xmax = preview->ymax = 1;
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preview->width = preview->xmax - preview->xmin;
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preview->height = preview->ymax - preview->ymin;
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gtk_table_resize (GTK_TABLE (preview), 3, 2);
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gtk_table_set_homogeneous (GTK_TABLE (preview), FALSE);
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preview->hadj = gtk_adjustment_new (0, 0, preview->width - 1, 1.0,
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preview->width, preview->width);
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g_signal_connect (preview->hadj, "value_changed",
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G_CALLBACK (gimp_preview_h_scroll),
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preview);
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preview->hscr = gtk_hscrollbar_new (GTK_ADJUSTMENT (preview->hadj));
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gtk_range_set_update_policy (GTK_RANGE (preview->hscr),
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GTK_UPDATE_CONTINUOUS);
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gtk_table_attach (GTK_TABLE (preview), preview->hscr, 0,1, 1,2,
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GTK_EXPAND | GTK_SHRINK | GTK_FILL, GTK_FILL, 0, 0);
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gtk_widget_show (preview->hscr);
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g_signal_connect (preview->hscr, "button-release-event",
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G_CALLBACK (gimp_preview_button_release), preview);
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preview->vadj = gtk_adjustment_new (0, 0, preview->height - 1, 1.0,
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preview->height, preview->height);
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g_signal_connect (preview->vadj, "value_changed",
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G_CALLBACK (gimp_preview_v_scroll),
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preview);
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preview->vscr = gtk_vscrollbar_new (GTK_ADJUSTMENT (preview->vadj));
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gtk_range_set_update_policy (GTK_RANGE (preview->vscr),
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GTK_UPDATE_CONTINUOUS);
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gtk_table_attach (GTK_TABLE (preview), preview->vscr, 1,2, 0,1,
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GTK_FILL, GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0);
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gtk_widget_show (preview->vscr);
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g_signal_connect (preview->vscr, "button-release-event",
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G_CALLBACK (gimp_preview_button_release), preview);
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/* the area itself */
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frame = gtk_frame_new (NULL);
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gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
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gtk_table_attach (GTK_TABLE (preview), frame,
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0,1, 0,1,
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GTK_FILL, GTK_FILL, 0,0);
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gtk_widget_show (frame);
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preview->area = gimp_preview_area_new ();
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gtk_widget_set_size_request (preview->area, preview->width, preview->height);
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gtk_container_add (GTK_CONTAINER (frame), preview->area);
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gtk_widget_show (preview->area);
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gtk_widget_set_events (preview->area,
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GDK_BUTTON_PRESS_MASK |
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GDK_BUTTON_RELEASE_MASK |
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GDK_POINTER_MOTION_HINT_MASK |
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GDK_BUTTON_MOTION_MASK);
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g_signal_connect (preview->area, "event",
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G_CALLBACK (gimp_preview_area_event),
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preview);
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g_signal_connect (preview->area, "realize",
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G_CALLBACK (gimp_preview_area_realize),
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NULL);
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g_signal_connect_swapped (preview->area, "size_allocate",
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G_CALLBACK (gimp_preview_area_size_allocate),
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preview);
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/* a toggle button to (des)activate the instant preview */
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preview->toggle_update = gtk_check_button_new_with_mnemonic (_("_Preview"));
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (preview->toggle_update),
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preview->update_preview);
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gtk_table_attach (GTK_TABLE (preview), preview->toggle_update,
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0, 1, 2, 3, GTK_FILL, GTK_FILL, 0, 0);
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g_signal_connect_after (preview->toggle_update, "toggled",
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G_CALLBACK (gimp_preview_toggle_callback),
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preview);
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}
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static void
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gimp_preview_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GimpPreview *preview = GIMP_PREVIEW (object);
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switch (property_id)
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{
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case PROP_UPDATE:
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g_value_set_boolean (value, preview->update_preview);
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break;
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case PROP_SHOW_UPDATE_TOGGLE:
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g_value_set_boolean (value, GTK_WIDGET_VISIBLE (preview->toggle_update));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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gimp_preview_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GimpPreview *preview = GIMP_PREVIEW (object);
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switch (property_id)
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{
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case PROP_UPDATE:
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (preview->toggle_update),
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g_value_get_boolean (value));
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break;
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case PROP_SHOW_UPDATE_TOGGLE:
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if (g_value_get_boolean (value))
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gtk_widget_show (preview->toggle_update);
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else
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gtk_widget_hide (preview->toggle_update);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static gboolean
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gimp_preview_button_release (GtkWidget *hs,
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GdkEventButton *ev,
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GimpPreview *preview)
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{
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gimp_preview_invalidate (preview);
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return FALSE;
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}
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static void
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gimp_preview_draw (GimpPreview *preview)
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{
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GimpPreviewClass *class = GIMP_PREVIEW_GET_CLASS (preview);
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if (class->draw)
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class->draw (preview);
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}
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static void
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gimp_preview_area_realize (GtkWidget *widget)
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{
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GdkDisplay *display = gtk_widget_get_display (widget);
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GdkCursor *cursor = gdk_cursor_new_for_display (display, GDK_FLEUR);
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gdk_window_set_cursor (widget->window, cursor);
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gdk_cursor_unref (cursor);
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}
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static void
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gimp_preview_area_size_allocate (GimpPreview *preview)
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{
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gimp_preview_draw (preview);
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gimp_preview_invalidate (preview);
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}
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static void
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gimp_preview_h_scroll (GtkAdjustment *hadj,
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GimpPreview *preview)
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{
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preview->xoff = hadj->value;
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if (!preview->in_drag)
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gimp_preview_draw (preview);
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}
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static void
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gimp_preview_v_scroll (GtkAdjustment *vadj,
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GimpPreview *preview)
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{
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preview->yoff = vadj->value;
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if (!preview->in_drag)
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gimp_preview_draw (preview);
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}
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static gboolean
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gimp_preview_area_event (GtkWidget *area,
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GdkEvent *event,
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GimpPreview *preview)
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{
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gint x, y;
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switch (event->type)
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{
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case GDK_BUTTON_PRESS:
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gtk_widget_get_pointer (area, &x, &y);
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preview->in_drag = TRUE;
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preview->drag_x = x;
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preview->drag_y = y;
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preview->drag_xoff = preview->xoff;
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preview->drag_yoff = preview->yoff;
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gtk_grab_add (area);
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break;
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case GDK_BUTTON_RELEASE:
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if (preview->in_drag)
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{
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gtk_grab_remove (area);
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preview->in_drag = FALSE;
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gimp_preview_invalidate (preview);
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}
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break;
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case GDK_MOTION_NOTIFY:
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if (preview->in_drag)
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{
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gint dx, dy;
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gint xoff, yoff;
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gtk_widget_get_pointer (area, &x, &y);
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dx = x - preview->drag_x;
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dy = y - preview->drag_y;
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xoff = CLAMP (preview->drag_xoff - dx,
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0, preview->xmax - preview->xmin - preview->width);
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yoff = CLAMP (preview->drag_yoff - dy,
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0, preview->ymax - preview->ymin - preview->height);
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gtk_adjustment_set_value (GTK_ADJUSTMENT (preview->hadj), xoff);
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gtk_adjustment_set_value (GTK_ADJUSTMENT (preview->vadj), yoff);
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gimp_preview_draw (preview);
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}
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break;
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default:
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break;
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}
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return FALSE;
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}
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static void
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gimp_preview_toggle_callback (GtkWidget *toggle,
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GimpPreview *preview)
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{
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if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (toggle)))
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{
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preview->update_preview = TRUE;
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gimp_preview_invalidate (preview);
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}
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else
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{
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preview->update_preview = FALSE;
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}
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g_object_notify (G_OBJECT (preview), "update");
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}
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/**
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* gimp_preview_get_size:
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* @preview: a #GimpPreview widget
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* @width: return location for the preview area width
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* @height: return location for the preview area height
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*
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* Since: GIMP 2.2
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**/
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void
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gimp_preview_get_size (GimpPreview *preview,
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gint *width,
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gint *height)
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{
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g_return_if_fail (GIMP_IS_PREVIEW (preview));
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if (width)
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*width = preview->width;
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if (height)
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*height = preview->height;
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}
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/**
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* gimp_preview_get_posistion:
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* @preview: a #GimpPreview widget
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* @x: return location for the horizontal offset
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* @y: return location for the vertical offset
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*
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* Since: GIMP 2.2
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**/
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void
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gimp_preview_get_position (GimpPreview *preview,
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gint *x,
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gint *y)
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{
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g_return_if_fail (GIMP_IS_PREVIEW (preview));
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if (x)
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*x = preview->xoff + preview->xmin;
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if (y)
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*y = preview->yoff + preview->ymin;
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}
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/**
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* gimp_preview_show_update_toggle:
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* @preview: a #GimpPreview widget
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* @show_update: whether to show the "Update Preview" toggle button
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*
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* Since: GIMP 2.2
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**/
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void
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gimp_preview_show_update_toggle (GimpPreview *preview,
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gboolean show_update)
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{
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g_return_if_fail (GIMP_IS_PREVIEW (preview));
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g_object_set (preview,
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"show_update_toggle", show_update,
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NULL);
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}
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/*
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* gimp_preview_invalidate:
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* @preview: a #GimpPreview widget
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*
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* Since: GIMP 2.2
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**/
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void
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gimp_preview_invalidate (GimpPreview *preview)
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{
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g_return_if_fail (GIMP_IS_PREVIEW (preview));
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if (preview->update_preview)
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g_signal_emit (preview, preview_signals[INVALIDATED], 0);
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}
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