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-rw-r--r--libgimpwidgets/gimpscrolledpreview.c917
1 files changed, 917 insertions, 0 deletions
diff --git a/libgimpwidgets/gimpscrolledpreview.c b/libgimpwidgets/gimpscrolledpreview.c
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpscrolledpreview.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 3 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, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "gimpwidgetstypes.h"
+
+#include "gimpicons.h"
+#include "gimppreviewarea.h"
+#include "gimpscrolledpreview.h"
+#include "gimp3migration.h"
+
+#include "libgimp/libgimp-intl.h"
+
+
+/**
+ * SECTION: gimpscrolledpreview
+ * @title: GimpScrolledPreview
+ * @short_description: A widget providing a #GimpPreview enhanced by
+ * scrolling capabilities.
+ *
+ * A widget providing a #GimpPreview enhanced by scrolling capabilities.
+ **/
+
+
+#define POPUP_SIZE 100
+
+
+typedef struct
+{
+ GtkPolicyType hscr_policy;
+ GtkPolicyType vscr_policy;
+ gint drag_x;
+ gint drag_y;
+ gint drag_xoff;
+ gint drag_yoff;
+ gboolean in_drag;
+ gint frozen;
+} GimpScrolledPreviewPrivate;
+
+#define GIMP_SCROLLED_PREVIEW_GET_PRIVATE(obj) \
+ ((GimpScrolledPreviewPrivate *) ((GimpScrolledPreview *) (obj))->priv)
+
+
+static void gimp_scrolled_preview_class_init (GimpScrolledPreviewClass *klass);
+static void gimp_scrolled_preview_init (GimpScrolledPreview *preview);
+static void gimp_scrolled_preview_dispose (GObject *object);
+
+static void gimp_scrolled_preview_area_realize (GtkWidget *widget,
+ GimpScrolledPreview *preview);
+static void gimp_scrolled_preview_area_unrealize (GtkWidget *widget,
+ GimpScrolledPreview *preview);
+static void gimp_scrolled_preview_area_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation,
+ GimpScrolledPreview *preview);
+static gboolean gimp_scrolled_preview_area_event (GtkWidget *area,
+ GdkEvent *event,
+ GimpScrolledPreview *preview);
+
+static void gimp_scrolled_preview_h_scroll (GtkAdjustment *hadj,
+ GimpPreview *preview);
+static void gimp_scrolled_preview_v_scroll (GtkAdjustment *vadj,
+ GimpPreview *preview);
+
+static gboolean gimp_scrolled_preview_nav_button_press (GtkWidget *widget,
+ GdkEventButton *event,
+ GimpScrolledPreview *preview);
+
+static gboolean gimp_scrolled_preview_nav_popup_event (GtkWidget *widget,
+ GdkEvent *event,
+ GimpScrolledPreview *preview);
+static gboolean gimp_scrolled_preview_nav_popup_expose (GtkWidget *widget,
+ GdkEventExpose *event,
+ GimpScrolledPreview *preview);
+
+static void gimp_scrolled_preview_set_cursor (GimpPreview *preview);
+
+
+static GimpPreviewClass *parent_class = NULL;
+
+
+GType
+gimp_scrolled_preview_get_type (void)
+{
+ static GType preview_type = 0;
+
+ if (! preview_type)
+ {
+ const GTypeInfo preview_info =
+ {
+ sizeof (GimpScrolledPreviewClass),
+ (GBaseInitFunc) NULL,
+ (GBaseFinalizeFunc) NULL,
+ (GClassInitFunc) gimp_scrolled_preview_class_init,
+ NULL, /* class_finalize */
+ NULL, /* class_data */
+ sizeof (GimpScrolledPreview),
+ 0, /* n_preallocs */
+ (GInstanceInitFunc) gimp_scrolled_preview_init,
+ };
+
+ preview_type = g_type_register_static (GIMP_TYPE_PREVIEW,
+ "GimpScrolledPreview",
+ &preview_info,
+ G_TYPE_FLAG_ABSTRACT);
+ }
+
+ return preview_type;
+}
+
+static void
+gimp_scrolled_preview_class_init (GimpScrolledPreviewClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpPreviewClass *preview_class = GIMP_PREVIEW_CLASS (klass);
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ object_class->dispose = gimp_scrolled_preview_dispose;
+
+ preview_class->set_cursor = gimp_scrolled_preview_set_cursor;
+
+ g_type_class_add_private (object_class, sizeof (GimpScrolledPreviewPrivate));
+}
+
+static void
+gimp_scrolled_preview_init (GimpScrolledPreview *preview)
+{
+ GimpScrolledPreviewPrivate *priv;
+ GtkWidget *image;
+ GtkAdjustment *adj;
+
+ preview->priv = G_TYPE_INSTANCE_GET_PRIVATE (preview,
+ GIMP_TYPE_SCROLLED_PREVIEW,
+ GimpScrolledPreviewPrivate);
+
+ priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+
+ preview->nav_popup = NULL;
+
+ priv->hscr_policy = GTK_POLICY_AUTOMATIC;
+ priv->vscr_policy = GTK_POLICY_AUTOMATIC;
+
+ priv->in_drag = FALSE;
+ priv->frozen = 1; /* we are frozen during init */
+
+ /* scrollbars */
+ adj = GTK_ADJUSTMENT (gtk_adjustment_new (0, 0, GIMP_PREVIEW (preview)->width - 1, 1.0,
+ GIMP_PREVIEW (preview)->width,
+ GIMP_PREVIEW (preview)->width));
+
+ g_signal_connect (adj, "value-changed",
+ G_CALLBACK (gimp_scrolled_preview_h_scroll),
+ preview);
+
+ preview->hscr = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, adj);
+ gtk_table_attach (GTK_TABLE (GIMP_PREVIEW (preview)->table),
+ preview->hscr, 0, 1, 1, 2,
+ GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
+
+ adj = GTK_ADJUSTMENT (gtk_adjustment_new (0, 0, GIMP_PREVIEW (preview)->height - 1, 1.0,
+ GIMP_PREVIEW (preview)->height,
+ GIMP_PREVIEW (preview)->height));
+
+ g_signal_connect (adj, "value-changed",
+ G_CALLBACK (gimp_scrolled_preview_v_scroll),
+ preview);
+
+ preview->vscr = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, adj);
+ gtk_table_attach (GTK_TABLE (GIMP_PREVIEW (preview)->table),
+ preview->vscr, 1, 2, 0, 1,
+ GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
+
+ /* Connect after here so that plug-ins get a chance to override the
+ * default behavior. See bug #364432.
+ */
+ g_signal_connect_after (GIMP_PREVIEW (preview)->area, "event",
+ G_CALLBACK (gimp_scrolled_preview_area_event),
+ preview);
+
+ g_signal_connect (GIMP_PREVIEW (preview)->area, "realize",
+ G_CALLBACK (gimp_scrolled_preview_area_realize),
+ preview);
+ g_signal_connect (GIMP_PREVIEW (preview)->area, "unrealize",
+ G_CALLBACK (gimp_scrolled_preview_area_unrealize),
+ preview);
+
+ g_signal_connect (GIMP_PREVIEW (preview)->area, "size-allocate",
+ G_CALLBACK (gimp_scrolled_preview_area_size_allocate),
+ preview);
+
+ /* navigation icon */
+ preview->nav_icon = gtk_event_box_new ();
+ gtk_table_attach (GTK_TABLE (GIMP_PREVIEW(preview)->table),
+ preview->nav_icon, 1,2, 1,2,
+ GTK_SHRINK, GTK_SHRINK, 0, 0);
+
+ image = gtk_image_new_from_icon_name (GIMP_ICON_DIALOG_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_scrolled_preview_nav_button_press),
+ preview);
+
+ priv->frozen = 0; /* thaw without actually calling draw/invalidate */
+}
+
+static void
+gimp_scrolled_preview_dispose (GObject *object)
+{
+ GimpScrolledPreview *preview = GIMP_SCROLLED_PREVIEW (object);
+
+ if (preview->nav_popup)
+ {
+ gtk_widget_destroy (preview->nav_popup);
+ preview->nav_popup = NULL;
+ }
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_scrolled_preview_area_realize (GtkWidget *widget,
+ GimpScrolledPreview *preview)
+{
+ GdkDisplay *display = gtk_widget_get_display (widget);
+
+ g_return_if_fail (preview->cursor_move == NULL);
+
+ preview->cursor_move = gdk_cursor_new_for_display (display, GDK_HAND1);
+}
+
+static void
+gimp_scrolled_preview_area_unrealize (GtkWidget *widget,
+ GimpScrolledPreview *preview)
+{
+ if (preview->cursor_move)
+ {
+ gdk_cursor_unref (preview->cursor_move);
+ preview->cursor_move = NULL;
+ }
+}
+
+static void
+gimp_scrolled_preview_hscr_update (GimpScrolledPreview *preview)
+{
+ GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
+ gint width;
+
+ width = GIMP_PREVIEW (preview)->xmax - GIMP_PREVIEW (preview)->xmin;
+
+ gtk_adjustment_configure (adj,
+ gtk_adjustment_get_value (adj),
+ 0, width,
+ 1.0,
+ MAX (GIMP_PREVIEW (preview)->width / 2.0, 1.0),
+ GIMP_PREVIEW (preview)->width);
+}
+
+static void
+gimp_scrolled_preview_vscr_update (GimpScrolledPreview *preview)
+{
+ GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
+ gint height;
+
+ height = GIMP_PREVIEW (preview)->ymax - GIMP_PREVIEW (preview)->ymin;
+
+ gtk_adjustment_configure (adj,
+ gtk_adjustment_get_value (adj),
+ 0, height,
+ 1.0,
+ MAX (GIMP_PREVIEW (preview)->height / 2.0, 1.0),
+ GIMP_PREVIEW (preview)->height);
+}
+
+static void
+gimp_scrolled_preview_area_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation,
+ GimpScrolledPreview *preview)
+{
+ GimpScrolledPreviewPrivate *priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+
+ gint width = GIMP_PREVIEW (preview)->xmax - GIMP_PREVIEW (preview)->xmin;
+ gint height = GIMP_PREVIEW (preview)->ymax - GIMP_PREVIEW (preview)->ymin;
+
+ gimp_scrolled_preview_freeze (preview);
+
+ GIMP_PREVIEW (preview)->width = MIN (width, allocation->width);
+ GIMP_PREVIEW (preview)->height = MIN (height, allocation->height);
+
+ gimp_scrolled_preview_hscr_update (preview);
+
+ switch (priv->hscr_policy)
+ {
+ case GTK_POLICY_AUTOMATIC:
+ gtk_widget_set_visible (preview->hscr,
+ width > GIMP_PREVIEW (preview)->width);
+ break;
+
+ case GTK_POLICY_ALWAYS:
+ gtk_widget_show (preview->hscr);
+ break;
+
+ case GTK_POLICY_NEVER:
+ gtk_widget_hide (preview->hscr);
+ break;
+ }
+
+ gimp_scrolled_preview_vscr_update (preview);
+
+ switch (priv->vscr_policy)
+ {
+ case GTK_POLICY_AUTOMATIC:
+ gtk_widget_set_visible (preview->vscr,
+ height > GIMP_PREVIEW (preview)->height);
+ break;
+
+ case GTK_POLICY_ALWAYS:
+ gtk_widget_show (preview->vscr);
+ break;
+
+ case GTK_POLICY_NEVER:
+ gtk_widget_hide (preview->vscr);
+ break;
+ }
+
+ gtk_widget_set_visible (preview->nav_icon,
+ gtk_widget_get_visible (preview->vscr) &&
+ gtk_widget_get_visible (preview->hscr) &&
+ GIMP_PREVIEW_GET_CLASS (preview)->draw_thumb);
+
+ gimp_scrolled_preview_thaw (preview);
+}
+
+static gboolean
+gimp_scrolled_preview_area_event (GtkWidget *area,
+ GdkEvent *event,
+ GimpScrolledPreview *preview)
+{
+ GimpScrolledPreviewPrivate *priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+ GdkEventButton *button_event = (GdkEventButton *) event;
+ GdkCursor *cursor;
+
+ switch (event->type)
+ {
+ case GDK_BUTTON_PRESS:
+ switch (button_event->button)
+ {
+ case 1:
+ case 2:
+ cursor = gdk_cursor_new_for_display (gtk_widget_get_display (area),
+ GDK_FLEUR);
+
+ if (gdk_pointer_grab (gtk_widget_get_window (area), TRUE,
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_BUTTON_MOTION_MASK |
+ GDK_POINTER_MOTION_HINT_MASK,
+ NULL, cursor,
+ gdk_event_get_time (event)) == GDK_GRAB_SUCCESS)
+ {
+ gtk_widget_get_pointer (area, &priv->drag_x, &priv->drag_y);
+
+ priv->drag_xoff = GIMP_PREVIEW (preview)->xoff;
+ priv->drag_yoff = GIMP_PREVIEW (preview)->yoff;
+ priv->in_drag = TRUE;
+ gtk_grab_add (area);
+ }
+
+ gdk_cursor_unref (cursor);
+
+ break;
+
+ case 3:
+ return TRUE;
+ }
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ if (priv->in_drag &&
+ (button_event->button == 1 || button_event->button == 2))
+ {
+ gdk_display_pointer_ungrab (gtk_widget_get_display (area),
+ gdk_event_get_time (event));
+
+ gtk_grab_remove (area);
+ priv->in_drag = FALSE;
+ }
+ break;
+
+ case GDK_MOTION_NOTIFY:
+ if (priv->in_drag)
+ {
+ GdkEventMotion *mevent = (GdkEventMotion *) event;
+ GtkAdjustment *hadj;
+ GtkAdjustment *vadj;
+ gint x, y;
+
+ hadj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
+ vadj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
+
+ gtk_widget_get_pointer (area, &x, &y);
+
+ x = priv->drag_xoff - (x - priv->drag_x);
+ y = priv->drag_yoff - (y - priv->drag_y);
+
+ x = CLAMP (x,
+ gtk_adjustment_get_lower (hadj),
+ gtk_adjustment_get_upper (hadj) -
+ gtk_adjustment_get_page_size (hadj));
+ y = CLAMP (y,
+ gtk_adjustment_get_lower (vadj),
+ gtk_adjustment_get_upper (vadj) -
+ gtk_adjustment_get_page_size (vadj));
+
+ if (GIMP_PREVIEW (preview)->xoff != x ||
+ GIMP_PREVIEW (preview)->yoff != y)
+ {
+ gtk_adjustment_set_value (hadj, x);
+ gtk_adjustment_set_value (vadj, y);
+
+ gimp_preview_draw (GIMP_PREVIEW (preview));
+ gimp_preview_invalidate (GIMP_PREVIEW (preview));
+ }
+
+ gdk_event_request_motions (mevent);
+ }
+ break;
+
+ case GDK_SCROLL:
+ {
+ GdkEventScroll *sevent = (GdkEventScroll *) event;
+ GdkScrollDirection direction = sevent->direction;
+ GtkAdjustment *adj;
+ gfloat value;
+
+ /* Ctrl-Scroll is reserved for zooming */
+ if (sevent->state & GDK_CONTROL_MASK)
+ return FALSE;
+
+ if (sevent->state & GDK_SHIFT_MASK)
+ switch (direction)
+ {
+ case GDK_SCROLL_UP: direction = GDK_SCROLL_LEFT; break;
+ case GDK_SCROLL_DOWN: direction = GDK_SCROLL_RIGHT; break;
+ case GDK_SCROLL_LEFT: direction = GDK_SCROLL_UP; break;
+ case GDK_SCROLL_RIGHT: direction = GDK_SCROLL_DOWN; break;
+ }
+
+ switch (direction)
+ {
+ case GDK_SCROLL_UP:
+ case GDK_SCROLL_DOWN:
+ default:
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
+ break;
+
+ case GDK_SCROLL_RIGHT:
+ case GDK_SCROLL_LEFT:
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
+ break;
+ }
+
+ value = gtk_adjustment_get_value (adj);
+
+ switch (direction)
+ {
+ case GDK_SCROLL_UP:
+ case GDK_SCROLL_LEFT:
+ value -= gtk_adjustment_get_page_increment (adj) / 2;
+ break;
+
+ case GDK_SCROLL_DOWN:
+ case GDK_SCROLL_RIGHT:
+ value += gtk_adjustment_get_page_increment (adj) / 2;
+ break;
+ }
+
+ gtk_adjustment_set_value (adj,
+ CLAMP (value,
+ gtk_adjustment_get_lower (adj),
+ gtk_adjustment_get_upper (adj) -
+ gtk_adjustment_get_page_size (adj)));
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return FALSE;
+}
+
+static void
+gimp_scrolled_preview_h_scroll (GtkAdjustment *hadj,
+ GimpPreview *preview)
+{
+ GimpScrolledPreviewPrivate *priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+
+ preview->xoff = gtk_adjustment_get_value (hadj);
+
+ gimp_preview_area_set_offsets (GIMP_PREVIEW_AREA (preview->area),
+ preview->xoff, preview->yoff);
+
+ if (! (priv->in_drag || priv->frozen))
+ {
+ gimp_preview_draw (preview);
+ gimp_preview_invalidate (preview);
+ }
+}
+
+static void
+gimp_scrolled_preview_v_scroll (GtkAdjustment *vadj,
+ GimpPreview *preview)
+{
+ GimpScrolledPreviewPrivate *priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+
+ preview->yoff = gtk_adjustment_get_value (vadj);
+
+ gimp_preview_area_set_offsets (GIMP_PREVIEW_AREA (preview->area),
+ preview->xoff, preview->yoff);
+
+ if (! (priv->in_drag || priv->frozen))
+ {
+ gimp_preview_draw (preview);
+ gimp_preview_invalidate (preview);
+ }
+}
+
+static gboolean
+gimp_scrolled_preview_nav_button_press (GtkWidget *widget,
+ GdkEventButton *event,
+ GimpScrolledPreview *preview)
+{
+ GimpPreview *gimp_preview = GIMP_PREVIEW (preview);
+ GtkAdjustment *adj;
+
+ if (preview->nav_popup)
+ return TRUE;
+
+ if (event->type == GDK_BUTTON_PRESS && event->button == 1)
+ {
+ GtkStyle *style = gtk_widget_get_style (widget);
+ 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 = g_object_new (GIMP_TYPE_PREVIEW_AREA,
+ "check-size", GIMP_CHECK_SIZE_SMALL_CHECKS,
+ "check-type", GIMP_PREVIEW_AREA (gimp_preview->area)->check_type,
+ NULL);
+
+ gtk_container_add (GTK_CONTAINER (inner), area);
+
+ g_signal_connect (area, "event",
+ G_CALLBACK (gimp_scrolled_preview_nav_popup_event),
+ preview);
+ g_signal_connect_after (area, "expose-event",
+ G_CALLBACK (gimp_scrolled_preview_nav_popup_expose),
+ preview);
+
+ GIMP_PREVIEW_GET_CLASS (preview)->draw_thumb (gimp_preview,
+ GIMP_PREVIEW_AREA (area),
+ POPUP_SIZE, POPUP_SIZE);
+ gtk_widget_realize (area);
+ gtk_widget_show (area);
+
+ gdk_window_get_origin (gtk_widget_get_window (widget), &x, &y);
+
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
+ h = ((gtk_adjustment_get_value (adj) /
+ gtk_adjustment_get_upper (adj)) +
+ (gtk_adjustment_get_page_size (adj) /
+ gtk_adjustment_get_upper (adj)) / 2.0);
+
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
+ v = ((gtk_adjustment_get_value (adj) /
+ gtk_adjustment_get_upper (adj)) +
+ (gtk_adjustment_get_page_size (adj) /
+ gtk_adjustment_get_upper (adj)) / 2.0);
+
+ 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 * style->xthickness,
+ y - 2 * 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 (gtk_widget_get_window (area), TRUE,
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_BUTTON_MOTION_MASK |
+ GDK_POINTER_MOTION_HINT_MASK,
+ gtk_widget_get_window (area), cursor,
+ event->time);
+
+ gdk_cursor_unref (cursor);
+ }
+
+ return TRUE;
+}
+
+static gboolean
+gimp_scrolled_preview_nav_popup_event (GtkWidget *widget,
+ GdkEvent *event,
+ GimpScrolledPreview *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 *mevent = (GdkEventMotion *) event;
+ GtkAdjustment *hadj;
+ GtkAdjustment *vadj;
+ GtkAllocation allocation;
+ gint cx, cy;
+ gdouble x, y;
+
+ hadj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
+ vadj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ gtk_widget_get_pointer (widget, &cx, &cy);
+
+ x = cx * (gtk_adjustment_get_upper (hadj) -
+ gtk_adjustment_get_lower (hadj)) / allocation.width;
+ y = cy * (gtk_adjustment_get_upper (vadj) -
+ gtk_adjustment_get_lower (vadj)) / allocation.height;
+
+ x += (gtk_adjustment_get_lower (hadj) -
+ gtk_adjustment_get_page_size (hadj) / 2);
+ y += (gtk_adjustment_get_lower (vadj) -
+ gtk_adjustment_get_page_size (vadj) / 2);
+
+ gtk_adjustment_set_value (hadj,
+ CLAMP (x,
+ gtk_adjustment_get_lower (hadj),
+ gtk_adjustment_get_upper (hadj) -
+ gtk_adjustment_get_page_size (hadj)));
+ gtk_adjustment_set_value (vadj,
+ CLAMP (y,
+ gtk_adjustment_get_lower (vadj),
+ gtk_adjustment_get_upper (vadj) -
+ gtk_adjustment_get_page_size (vadj)));
+
+ gtk_widget_queue_draw (widget);
+ gdk_window_process_updates (gtk_widget_get_window (widget), FALSE);
+
+ gdk_event_request_motions (mevent);
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return FALSE;
+}
+
+static gboolean
+gimp_scrolled_preview_nav_popup_expose (GtkWidget *widget,
+ GdkEventExpose *event,
+ GimpScrolledPreview *preview)
+{
+ GtkAdjustment *adj;
+ GtkAllocation allocation;
+ cairo_t *cr;
+ gdouble x, y;
+ gdouble w, h;
+
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ x = (gtk_adjustment_get_value (adj) /
+ (gtk_adjustment_get_upper (adj) -
+ gtk_adjustment_get_lower (adj)));
+ w = (gtk_adjustment_get_page_size (adj) /
+ (gtk_adjustment_get_upper (adj) -
+ gtk_adjustment_get_lower (adj)));
+
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
+
+ y = (gtk_adjustment_get_value (adj) /
+ (gtk_adjustment_get_upper (adj) -
+ gtk_adjustment_get_lower (adj)));
+ h = (gtk_adjustment_get_page_size (adj) /
+ (gtk_adjustment_get_upper (adj) -
+ gtk_adjustment_get_lower (adj)));
+
+ if (w >= 1.0 && h >= 1.0)
+ return FALSE;
+
+ x = floor (x * (gdouble) allocation.width);
+ y = floor (y * (gdouble) allocation.height);
+ w = MAX (1, ceil (w * (gdouble) allocation.width));
+ h = MAX (1, ceil (h * (gdouble) allocation.height));
+
+ cr = gdk_cairo_create (gtk_widget_get_window (widget));
+
+ gdk_cairo_region (cr, event->region);
+ cairo_clip (cr);
+
+ cairo_rectangle (cr,
+ 0, 0, allocation.width, allocation.height);
+
+ cairo_rectangle (cr, x, y, w, h);
+
+ cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
+ cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+ cairo_fill (cr);
+
+ cairo_rectangle (cr, x, y, w, h);
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_set_line_width (cr, 2);
+ cairo_stroke (cr);
+
+ cairo_destroy (cr);
+
+ return FALSE;
+}
+
+static void
+gimp_scrolled_preview_set_cursor (GimpPreview *preview)
+{
+ if (! gtk_widget_get_realized (preview->area))
+ return;
+
+ if (preview->xmax - preview->xmin > preview->width ||
+ preview->ymax - preview->ymin > preview->height)
+ {
+ gdk_window_set_cursor (gtk_widget_get_window (preview->area),
+ GIMP_SCROLLED_PREVIEW (preview)->cursor_move);
+ }
+ else
+ {
+ gdk_window_set_cursor (gtk_widget_get_window (preview->area),
+ preview->default_cursor);
+ }
+}
+
+/**
+ * gimp_scrolled_preview_set_position:
+ * @preview: a #GimpScrolledPreview
+ * @x: horizontal scroll offset
+ * @y: vertical scroll offset
+ *
+ * Since: 2.4
+ **/
+void
+gimp_scrolled_preview_set_position (GimpScrolledPreview *preview,
+ gint x,
+ gint y)
+{
+ GtkAdjustment *adj;
+
+ g_return_if_fail (GIMP_IS_SCROLLED_PREVIEW (preview));
+
+ gimp_scrolled_preview_freeze (preview);
+
+ gimp_scrolled_preview_hscr_update (preview);
+ gimp_scrolled_preview_vscr_update (preview);
+
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->hscr));
+ gtk_adjustment_set_value (adj, x - GIMP_PREVIEW (preview)->xmin);
+
+ adj = gtk_range_get_adjustment (GTK_RANGE (preview->vscr));
+ gtk_adjustment_set_value (adj, y - GIMP_PREVIEW (preview)->ymin);
+
+ gimp_scrolled_preview_thaw (preview);
+}
+
+/**
+ * gimp_scrolled_preview_set_policy
+ * @preview: a #GimpScrolledPreview
+ * @hscrollbar_policy: policy for horizontal scrollbar
+ * @vscrollbar_policy: policy for vertical scrollbar
+ *
+ * Since: 2.4
+ **/
+void
+gimp_scrolled_preview_set_policy (GimpScrolledPreview *preview,
+ GtkPolicyType hscrollbar_policy,
+ GtkPolicyType vscrollbar_policy)
+{
+ GimpScrolledPreviewPrivate *priv;
+
+ g_return_if_fail (GIMP_IS_SCROLLED_PREVIEW (preview));
+
+ priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+
+ priv->hscr_policy = hscrollbar_policy;
+ priv->vscr_policy = vscrollbar_policy;
+
+ gtk_widget_queue_resize (GIMP_PREVIEW (preview)->area);
+}
+
+
+/**
+ * gimp_scrolled_preview_freeze:
+ * @preview: a #GimpScrolledPreview
+ *
+ * While the @preview is frozen, it is not going to redraw itself in
+ * response to scroll events.
+ *
+ * This function should only be used to implement widgets derived from
+ * #GimpScrolledPreview. There is no point in calling this from a plug-in.
+ *
+ * Since: 2.4
+ **/
+void
+gimp_scrolled_preview_freeze (GimpScrolledPreview *preview)
+{
+ GimpScrolledPreviewPrivate *priv;
+
+ g_return_if_fail (GIMP_IS_SCROLLED_PREVIEW (preview));
+
+ priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+
+ priv->frozen++;
+}
+
+/**
+ * gimp_scrolled_preview_thaw:
+ * @preview: a #GimpScrolledPreview
+ *
+ * While the @preview is frozen, it is not going to redraw itself in
+ * response to scroll events.
+ *
+ * This function should only be used to implement widgets derived from
+ * #GimpScrolledPreview. There is no point in calling this from a plug-in.
+ *
+ * Since: 2.4
+ **/
+void
+gimp_scrolled_preview_thaw (GimpScrolledPreview *preview)
+{
+ GimpScrolledPreviewPrivate *priv;
+
+ g_return_if_fail (GIMP_IS_SCROLLED_PREVIEW (preview));
+
+ priv = GIMP_SCROLLED_PREVIEW_GET_PRIVATE (preview);
+
+ g_return_if_fail (priv->frozen > 0);
+
+ priv->frozen--;
+
+ if (! priv->frozen)
+ {
+ gimp_preview_draw (GIMP_PREVIEW (preview));
+ gimp_preview_invalidate (GIMP_PREVIEW (preview));
+ }
+}