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gimp/libgimpwidgets/gimppreview.c
Sven Neumann 6a824465f5 fixed positioning of the navigation marker and handling of motion events. 
2004-09-10  Sven Neumann  <sven@gimp.org>

	* libgimpwidgets/gimppreview.c: fixed positioning of the
	navigation marker and handling of motion events.
2004-09-10 09:02:19 +00:00

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimppreview.c
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; 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 "libgimpmath/gimpmath.h"
#include "gimpwidgets.h"
#include "gimppreview.h"
#include "libgimp/libgimp-intl.h"
#define DEFAULT_SIZE 150
#define POPUP_SIZE 100
#define PEN_WIDTH 3
#define PREVIEW_TIMEOUT 200
enum
{
INVALIDATED,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_UPDATE
};
static void gimp_preview_class_init (GimpPreviewClass *klass);
static void gimp_preview_init (GimpPreview *preview);
static void gimp_preview_dispose (GObject *object);
static void gimp_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_preview_direction_changed (GtkWidget *widget,
GtkTextDirection prev_dir);
static gboolean gimp_preview_popup_menu (GtkWidget *widget);
static void gimp_preview_area_realize (GtkWidget *widget,
GimpPreview *preview);
static void gimp_preview_area_unrealize (GtkWidget *widget,
GimpPreview *preview);
static void gimp_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpPreview *preview);
static gboolean gimp_preview_area_event (GtkWidget *area,
GdkEvent *event,
GimpPreview *preview);
static void gimp_preview_h_scroll (GtkAdjustment *hadj,
GimpPreview *preview);
static void gimp_preview_v_scroll (GtkAdjustment *vadj,
GimpPreview *preview);
static gboolean gimp_preview_nav_button_press (GtkWidget *widget,
GdkEventButton *event,
GimpPreview *preview);
static void gimp_preview_nav_popup_realize (GtkWidget *widget,
GimpPreview *preview);
static void gimp_preview_nav_popup_unrealize (GtkWidget *widget,
GimpPreview *preview);
static gboolean gimp_preview_nav_popup_event (GtkWidget *widget,
GdkEvent *event,
GimpPreview *preview);
static gboolean gimp_preview_nav_popup_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpPreview *preview);
static void gimp_preview_toggle_callback (GtkWidget *toggle,
GimpPreview *preview);
static void gimp_preview_notify_checks (GimpPreview *preview);
static gboolean gimp_preview_invalidate_now (GimpPreview *preview);
static guint preview_signals[LAST_SIGNAL] = { 0 };
static GtkVBoxClass *parent_class = NULL;
GType
gimp_preview_get_type (void)
{
static GType preview_type = 0;
if (! preview_type)
{
static const GTypeInfo preview_info =
{
sizeof (GimpPreviewClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(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_VBOX,
"GimpPreview",
&preview_info,
G_TYPE_FLAG_ABSTRACT);
}
return preview_type;
}
static void
gimp_preview_class_init (GimpPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
preview_signals[INVALIDATED] =
g_signal_new ("invalidated",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPreviewClass, invalidated),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->dispose = gimp_preview_dispose;
object_class->get_property = gimp_preview_get_property;
object_class->set_property = gimp_preview_set_property;
widget_class->direction_changed = gimp_preview_direction_changed;
widget_class->popup_menu = gimp_preview_popup_menu;
klass->draw = NULL;
klass->draw_thumb = NULL;
g_object_class_install_property (object_class,
PROP_UPDATE,
g_param_spec_boolean ("update",
NULL, NULL,
TRUE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("size",
NULL, NULL,
1, 1024,
DEFAULT_SIZE,
G_PARAM_READABLE));
}
static void
gimp_preview_init (GimpPreview *preview)
{
GtkWidget *table;
GtkWidget *frame;
GtkWidget *image;
GtkObject *adj;
gdouble xalign = 0.0;
gtk_box_set_homogeneous (GTK_BOX (preview), FALSE);
gtk_box_set_spacing (GTK_BOX (preview), 6);
if (gtk_widget_get_direction (GTK_WIDGET (preview)) == GTK_TEXT_DIR_RTL)
xalign = 1.0;
preview->frame = gtk_aspect_frame_new (NULL, xalign, 0.0, 1.0, TRUE);
gtk_frame_set_shadow_type (GTK_FRAME (preview->frame), GTK_SHADOW_NONE);
gtk_box_pack_start (GTK_BOX (preview), preview->frame, TRUE, TRUE, 0);
gtk_widget_show (preview->frame);
table = gtk_table_new (3, 2, FALSE);
gtk_container_add (GTK_CONTAINER (preview->frame), table);
gtk_widget_show (table);
preview->xoff = 0;
preview->yoff = 0;
preview->in_drag = FALSE;
preview->timeout_id = 0;
preview->xmin = preview->ymin = 0;
preview->xmax = preview->ymax = 1;
preview->width = preview->xmax - preview->xmin;
preview->height = preview->ymax - preview->ymin;
preview->nav_popup = NULL;
/* scrollbars */
adj = gtk_adjustment_new (0, 0, preview->width - 1, 1.0,
preview->width, preview->width);
g_signal_connect (adj, "value_changed",
G_CALLBACK (gimp_preview_h_scroll),
preview);
preview->hscr = gtk_hscrollbar_new (GTK_ADJUSTMENT (adj));
gtk_range_set_update_policy (GTK_RANGE (preview->hscr),
GTK_UPDATE_CONTINUOUS);
gtk_table_attach (GTK_TABLE (table), preview->hscr, 0,1, 1,2,
GTK_EXPAND | GTK_SHRINK | GTK_FILL, GTK_FILL, 0, 0);
adj = gtk_adjustment_new (0, 0, preview->height - 1, 1.0,
preview->height, preview->height);
g_signal_connect (adj, "value_changed",
G_CALLBACK (gimp_preview_v_scroll),
preview);
preview->vscr = gtk_vscrollbar_new (GTK_ADJUSTMENT (adj));
gtk_range_set_update_policy (GTK_RANGE (preview->vscr),
GTK_UPDATE_CONTINUOUS);
gtk_table_attach (GTK_TABLE (table), preview->vscr, 1,2, 0,1,
GTK_FILL, GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0);
/* preview area */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_table_attach (GTK_TABLE (table), frame, 0,1, 0,1,
GTK_FILL | GTK_EXPAND, GTK_FILL | GTK_EXPAND, 0, 0);
gtk_widget_show (frame);
preview->area = gimp_preview_area_new ();
gtk_container_add (GTK_CONTAINER (frame), preview->area);
gtk_widget_show (preview->area);
g_signal_connect_swapped (preview->area, "notify::check-size",
G_CALLBACK (gimp_preview_notify_checks),
preview);
g_signal_connect_swapped (preview->area, "notify::check-type",
G_CALLBACK (gimp_preview_notify_checks),
preview);
gtk_widget_add_events (preview->area,
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON_MOTION_MASK);
g_signal_connect (preview->area, "event",
G_CALLBACK (gimp_preview_area_event),
preview);
g_signal_connect (preview->area, "realize",
G_CALLBACK (gimp_preview_area_realize),
preview);
g_signal_connect (preview->area, "unrealize",
G_CALLBACK (gimp_preview_area_unrealize),
preview);
g_signal_connect (preview->area, "size_allocate",
G_CALLBACK (gimp_preview_area_size_allocate),
preview);
/* navigation icon */
preview->nav_icon = gtk_event_box_new ();
gtk_table_attach (GTK_TABLE (table), preview->nav_icon, 1,2, 1,2,
GTK_SHRINK, GTK_SHRINK, 0, 0);
image = gtk_image_new_from_stock (GIMP_STOCK_NAVIGATION, GTK_ICON_SIZE_MENU);
gtk_container_add (GTK_CONTAINER (preview->nav_icon), image);
gtk_widget_show (image);
g_signal_connect (preview->nav_icon, "button_press_event",
G_CALLBACK (gimp_preview_nav_button_press),
preview);
/* toggle button to (des)activate the instant preview */
preview->toggle = gtk_check_button_new_with_mnemonic (_("_Preview"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (preview->toggle),
preview->update_preview);
gtk_box_pack_start (GTK_BOX (preview), preview->toggle, FALSE, FALSE, 0);
gtk_widget_show (preview->toggle);
g_signal_connect (preview->toggle, "toggled",
G_CALLBACK (gimp_preview_toggle_callback),
preview);
}
static void
gimp_preview_dispose (GObject *object)
{
GimpPreview *preview = GIMP_PREVIEW (object);
if (preview->timeout_id)
{
g_source_remove (preview->timeout_id);
preview->timeout_id = 0;
}
if (preview->nav_popup)
{
gtk_widget_destroy (preview->nav_popup);
preview->nav_popup = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpPreview *preview = GIMP_PREVIEW (object);
switch (property_id)
{
case PROP_UPDATE:
g_value_set_boolean (value, preview->update_preview);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpPreview *preview = GIMP_PREVIEW (object);
switch (property_id)
{
case PROP_UPDATE:
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (preview->toggle),
g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_preview_direction_changed (GtkWidget *widget,
GtkTextDirection prev_dir)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
gdouble xalign = 0.0;
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
xalign = 1.0;
gtk_aspect_frame_set (GTK_ASPECT_FRAME (preview->frame),
xalign, 0.0, 1.0, TRUE);
}
static gboolean
gimp_preview_popup_menu (GtkWidget *widget)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
gimp_preview_area_menu_popup (GIMP_PREVIEW_AREA (preview->area), NULL);
return TRUE;
}
static void
gimp_preview_area_realize (GtkWidget *widget,
GimpPreview *preview)
{
GdkDisplay *display = gtk_widget_get_display (widget);
g_return_if_fail (preview->cursor_move == NULL);
g_return_if_fail (preview->cursor_busy == NULL);
preview->cursor_move = gdk_cursor_new_for_display (display, GDK_FLEUR);
preview->cursor_busy = gdk_cursor_new_for_display (display, GDK_WATCH);
if (preview->xmax - preview->xmin > preview->width ||
preview->ymax - preview->ymin > preview->height)
{
gdk_window_set_cursor (widget->window, preview->cursor_move);
}
else
{
gdk_window_set_cursor (widget->window, NULL);
}
}
static void
gimp_preview_area_unrealize (GtkWidget *widget,
GimpPreview *preview)
{
if (preview->cursor_move)
{
gdk_cursor_unref (preview->cursor_move);
preview->cursor_move = NULL;
}
if (preview->cursor_busy)
{
gdk_cursor_unref (preview->cursor_busy);
preview->cursor_busy = NULL;
}
}
static void
gimp_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpPreview *preview)
{
GdkCursor *cursor = NULL;
gint width = preview->xmax - preview->xmin;
gint height = preview->ymax - preview->ymin;
preview->width = MIN (width, allocation->width);
preview->height = MIN (height, allocation->height);
if (width > preview->width)
{
GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
adj->lower = 0;
adj->upper = width;
adj->page_size = preview->width;
adj->step_increment = 1.0;
adj->page_increment = MAX (adj->page_size / 2.0, adj->step_increment);
gtk_adjustment_changed (adj);
gtk_widget_show (preview->hscr);
cursor = preview->cursor_move;
}
else
{
gtk_widget_hide (preview->hscr);
}
if (height > preview->height)
{
GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
adj->lower = 0;
adj->upper = height;
adj->page_size = preview->height;
adj->step_increment = 1.0;
adj->page_increment = MAX (adj->page_size / 2.0, adj->step_increment);
gtk_adjustment_changed (adj);
gtk_widget_show (preview->vscr);
cursor = preview->cursor_move;
}
else
{
gtk_widget_hide (preview->vscr);
}
if (GTK_WIDGET_VISIBLE (preview->vscr) &&
GTK_WIDGET_VISIBLE (preview->hscr) &&
GIMP_PREVIEW_GET_CLASS (preview)->draw_thumb)
{
gtk_widget_show (preview->nav_icon);
}
else
{
gtk_widget_hide (preview->nav_icon);
}
if (GTK_WIDGET_REALIZED (widget))
gdk_window_set_cursor (widget->window, cursor);
gimp_preview_draw (preview);
gimp_preview_invalidate (preview);
}
static gboolean
gimp_preview_area_event (GtkWidget *area,
GdkEvent *event,
GimpPreview *preview)
{
GdkEventButton *button_event = (GdkEventButton *) event;
switch (event->type)
{
case GDK_BUTTON_PRESS:
switch (button_event->button)
{
case 1:
gtk_widget_get_pointer (area, &preview->drag_x, &preview->drag_y);
preview->drag_xoff = preview->xoff;
preview->drag_yoff = preview->yoff;
preview->in_drag = TRUE;
gtk_grab_add (area);
break;
case 2:
break;
case 3:
gimp_preview_area_menu_popup (GIMP_PREVIEW_AREA (area), button_event);
return TRUE;
}
break;
case GDK_BUTTON_RELEASE:
if (preview->in_drag && button_event->button == 1)
{
gtk_grab_remove (area);
preview->in_drag = FALSE;
}
break;
case GDK_MOTION_NOTIFY:
if (preview->in_drag)
{
gint x, y;
gint dx, dy;
gint xoff, yoff;
gtk_widget_get_pointer (area, &x, &y);
dx = x - preview->drag_x;
dy = y - preview->drag_y;
xoff = CLAMP (preview->drag_xoff - dx,
0, preview->xmax - preview->xmin - preview->width);
yoff = CLAMP (preview->drag_yoff - dy,
0, preview->ymax - preview->ymin - preview->height);
if (preview->xoff != xoff || preview->yoff != yoff)
{
gtk_range_set_value (GTK_RANGE (preview->hscr), xoff);
gtk_range_set_value (GTK_RANGE (preview->vscr), yoff);
gimp_preview_draw (preview);
gimp_preview_invalidate (preview);
}
}
break;
default:
break;
}
return FALSE;
}
static void
gimp_preview_h_scroll (GtkAdjustment *hadj,
GimpPreview *preview)
{
preview->xoff = hadj->value;
gimp_preview_area_set_offsets (GIMP_PREVIEW_AREA (preview->area),
preview->xoff, preview->yoff);
if (! preview->in_drag)
{
gimp_preview_draw (preview);
gimp_preview_invalidate (preview);
}
}
static void
gimp_preview_v_scroll (GtkAdjustment *vadj,
GimpPreview *preview)
{
preview->yoff = vadj->value;
gimp_preview_area_set_offsets (GIMP_PREVIEW_AREA (preview->area),
preview->xoff, preview->yoff);
if (! preview->in_drag)
{
gimp_preview_draw (preview);
gimp_preview_invalidate (preview);
}
}
static gboolean
gimp_preview_nav_button_press (GtkWidget *widget,
GdkEventButton *event,
GimpPreview *preview)
{
if (preview->nav_popup)
return TRUE;
if (event->type == GDK_BUTTON_PRESS && event->button == 1)
{
GtkWidget *outer;
GtkWidget *inner;
GtkWidget *area;
GdkCursor *cursor;
gint x, y;
gdouble h, v;
preview->nav_popup = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_screen (GTK_WINDOW (preview->nav_popup),
gtk_widget_get_screen (widget));
outer = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (outer), GTK_SHADOW_OUT);
gtk_container_add (GTK_CONTAINER (preview->nav_popup), outer);
gtk_widget_show (outer);
inner = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (inner), GTK_SHADOW_IN);
gtk_container_add (GTK_CONTAINER (outer), inner);
gtk_widget_show (inner);
area = gimp_preview_area_new ();
gtk_container_add (GTK_CONTAINER (inner), area);
g_signal_connect (area, "realize",
G_CALLBACK (gimp_preview_nav_popup_realize),
preview);
g_signal_connect (area, "unrealize",
G_CALLBACK (gimp_preview_nav_popup_unrealize),
preview);
g_signal_connect (area, "event",
G_CALLBACK (gimp_preview_nav_popup_event),
preview);
g_signal_connect_after (area, "expose_event",
G_CALLBACK (gimp_preview_nav_popup_expose),
preview);
GIMP_PREVIEW_GET_CLASS (preview)->draw_thumb (preview,
GIMP_PREVIEW_AREA (area),
POPUP_SIZE, POPUP_SIZE);
gtk_widget_realize (area);
gtk_widget_show (area);
gdk_window_get_origin (widget->window, &x, &y);
h = ((gdouble) (preview->xoff + preview->width / 2) /
(gdouble) (preview->xmax - preview->xmin));
v = ((gdouble) (preview->yoff + preview->height / 2) /
(gdouble) (preview->ymax - preview->ymin));
x += event->x - h * (gdouble) GIMP_PREVIEW_AREA (area)->width;
y += event->y - v * (gdouble) GIMP_PREVIEW_AREA (area)->height;
gtk_window_move (GTK_WINDOW (preview->nav_popup),
x - 2 * widget->style->xthickness,
y - 2 * widget->style->ythickness);
gtk_widget_show (preview->nav_popup);
gtk_grab_add (area);
cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
GDK_FLEUR);
gdk_pointer_grab (area->window, TRUE,
GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_MOTION_MASK,
area->window, cursor,
event->time);
gdk_cursor_unref (cursor);
}
return TRUE;
}
static void
gimp_preview_nav_popup_realize (GtkWidget *widget,
GimpPreview *preview)
{
if (! preview->nav_gc)
{
preview->nav_gc = gdk_gc_new (widget->window);
gdk_gc_set_function (preview->nav_gc, GDK_INVERT);
gdk_gc_set_line_attributes (preview->nav_gc,
PEN_WIDTH,
GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_ROUND);
}
}
static void
gimp_preview_nav_popup_unrealize (GtkWidget *widget,
GimpPreview *preview)
{
if (preview->nav_gc)
{
g_object_unref (preview->nav_gc);
preview->nav_gc = NULL;
}
}
static gboolean
gimp_preview_nav_popup_event (GtkWidget *widget,
GdkEvent *event,
GimpPreview *preview)
{
switch (event->type)
{
case GDK_BUTTON_RELEASE:
{
GdkEventButton *button_event = (GdkEventButton *) event;
if (button_event->button == 1)
{
gtk_grab_remove (widget);
gdk_display_pointer_ungrab (gtk_widget_get_display (widget),
button_event->time);
gtk_widget_destroy (preview->nav_popup);
preview->nav_popup = NULL;
}
}
break;
case GDK_MOTION_NOTIFY:
{
GdkEventMotion *motion_event = (GdkEventMotion *) event;
GtkAdjustment *hadj;
GtkAdjustment *vadj;
gdouble x, y;
hadj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
vadj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
x = (motion_event->x *
(hadj->upper - hadj->lower) / widget->allocation.width);
y = (motion_event->y *
(vadj->upper - vadj->lower) / widget->allocation.height);
x += hadj->lower - hadj->page_size / 2;
y += vadj->lower - vadj->page_size / 2;
gtk_adjustment_set_value (hadj, CLAMP (x,
hadj->lower,
hadj->upper - hadj->page_size));
gtk_adjustment_set_value (vadj, CLAMP (y,
vadj->lower,
vadj->upper - vadj->page_size));
gtk_widget_queue_draw (widget);
}
break;
default:
break;
}
return FALSE;
}
static gboolean
gimp_preview_nav_popup_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpPreview *preview)
{
gdouble x, y;
gdouble w, h;
x = (gdouble) preview->xoff / (gdouble) (preview->xmax - preview->xmin);
y = (gdouble) preview->yoff / (gdouble) (preview->ymax - preview->ymin);
w = (gdouble) preview->width / (gdouble) (preview->xmax - preview->xmin);
h = (gdouble) preview->height / (gdouble) (preview->ymax - preview->ymin);
gdk_gc_set_clip_rectangle (preview->nav_gc, &event->area);
gdk_draw_rectangle (widget->window, preview->nav_gc,
FALSE,
x * (gdouble) widget->allocation.width + PEN_WIDTH / 2,
y * (gdouble) widget->allocation.height + PEN_WIDTH / 2,
MAX (1,
ceil (w * widget->allocation.width) - PEN_WIDTH),
MAX (1,
ceil (h * widget->allocation.height) - PEN_WIDTH));
return FALSE;
}
static void
gimp_preview_toggle_callback (GtkWidget *toggle,
GimpPreview *preview)
{
if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (toggle)))
{
preview->update_preview = TRUE;
if (preview->timeout_id)
g_source_remove (preview->timeout_id);
gimp_preview_invalidate_now (preview);
}
else
{
preview->update_preview = FALSE;
gimp_preview_draw (preview);
}
g_object_notify (G_OBJECT (preview), "update");
}
static void
gimp_preview_notify_checks (GimpPreview *preview)
{
gimp_preview_draw (preview);
gimp_preview_invalidate (preview);
}
static gboolean
gimp_preview_invalidate_now (GimpPreview *preview)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (preview));
preview->timeout_id = 0;
if (toplevel && GTK_WIDGET_REALIZED (toplevel))
{
gdk_window_set_cursor (toplevel->window, preview->cursor_busy);
gdk_window_set_cursor (preview->area->window, preview->cursor_busy);
gdk_flush ();
g_signal_emit (preview, preview_signals[INVALIDATED], 0);
if (preview->xmax - preview->xmin > preview->width ||
preview->ymax - preview->ymin > preview->height)
{
gdk_window_set_cursor (preview->area->window, preview->cursor_move);
}
else
{
gdk_window_set_cursor (preview->area->window, NULL);
}
gdk_window_set_cursor (toplevel->window, NULL);
}
else
{
g_signal_emit (preview, preview_signals[INVALIDATED], 0);
}
return FALSE;
}
/**
* gimp_preview_set_update:
* @preview: a #GimpPreview widget
* @update: %TRUE if the preview should invalidate itself when being
* scrolled or when gimp_preview_invalidate() is being called
*
* Sets the state of the "Preview" check button.
*
* Since: GIMP 2.2
**/
void
gimp_preview_set_update (GimpPreview *preview,
gboolean update)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_object_set (preview,
"update", update,
NULL);
}
/**
* gimp_preview_get_update:
* @preview: a #GimpPreview widget
*
* Return value: the state of the "Preview" check button.
*
* Since: GIMP 2.2
**/
gboolean
gimp_preview_get_update (GimpPreview *preview)
{
g_return_val_if_fail (GIMP_IS_PREVIEW (preview), FALSE);
return preview->update_preview;
}
/**
* gimp_preview_set_bounds:
* @preview: a #GimpPreview widget
* @xmin:
* @ymin:
* @xmax:
* @ymax:
*
* Sets the lower and upper limits for the previewed area. The
* difference between the upper and lower value is used to set the
* maximum size of the #GimpPreviewArea used in the @preview.
*
* Since: GIMP 2.2
**/
void
gimp_preview_set_bounds (GimpPreview *preview,
gint xmin,
gint ymin,
gint xmax,
gint ymax)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
g_return_if_fail (xmax > xmin);
g_return_if_fail (ymax > ymin);
preview->xmin = xmin;
preview->ymin = ymin;
preview->xmax = xmax;
preview->ymax = ymax;
gimp_preview_area_set_max_size (GIMP_PREVIEW_AREA (preview->area),
xmax - xmin,
ymax - ymin);
}
/**
* gimp_preview_get_size:
* @preview: a #GimpPreview widget
* @width: return location for the preview area width
* @height: return location for the preview area height
*
* Since: GIMP 2.2
**/
void
gimp_preview_get_size (GimpPreview *preview,
gint *width,
gint *height)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
if (width)
*width = preview->width;
if (height)
*height = preview->height;
}
/**
* gimp_preview_get_position:
* @preview: a #GimpPreview widget
* @x: return location for the horizontal offset
* @y: return location for the vertical offset
*
* Since: GIMP 2.2
**/
void
gimp_preview_get_position (GimpPreview *preview,
gint *x,
gint *y)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
if (x)
*x = preview->xoff + preview->xmin;
if (y)
*y = preview->yoff + preview->ymin;
}
/*
* gimp_preview_draw:
* @preview: a #GimpPreview widget
*
* Calls the GimpPreview::draw method. GimpPreview itself doesn't
* implement a default draw method so the behaviour is determined by
* the derived class implementing this method.
*
* #GimpDrawablePreview implements gimp_preview_draw() by drawing the
* original, unmodified drawable to the @preview.
*
* Since: GIMP 2.2
**/
void
gimp_preview_draw (GimpPreview *preview)
{
GimpPreviewClass *class = GIMP_PREVIEW_GET_CLASS (preview);
if (class->draw)
class->draw (preview);
}
/*
* gimp_preview_invalidate:
* @preview: a #GimpPreview widget
*
* This function starts or renews a short low-priority timeout. When
* the timeout expires, the GimpPreview::invalidated signal is emitted
* which will usually cause the @preview to be updated.
*
* This function does nothing unless the "Preview" button is checked.
*
* During the emission of the signal a busy cursor is set on the
* toplevel window containing the @preview and on the preview area
* itself.
*
* Since: GIMP 2.2
**/
void
gimp_preview_invalidate (GimpPreview *preview)
{
g_return_if_fail (GIMP_IS_PREVIEW (preview));
if (preview->update_preview)
{
if (preview->timeout_id)
g_source_remove (preview->timeout_id);
preview->timeout_id =
g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE, PREVIEW_TIMEOUT,
(GSourceFunc) gimp_preview_invalidate_now,
preview, NULL);
}
}
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