static void
image_view_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
ImageView *image_view = IMAGE_VIEW (object);
ImageViewPrivate *priv = image_view->priv;
switch (property_id) {
case PROP_INTERP_TYPE:
g_value_set_int (value, priv->interp_type);
break;
case PROP_CHECK_TYPE:
g_value_set_int (value, priv->check_type);
break;
case PROP_CHECK_SIZE:
g_value_set_int (value, priv->check_size);
break;
case PROP_DITHER:
g_value_set_int (value, priv->dither);
break;
default:
g_warning ("unknown property id `%d'", property_id);
break;
}
}
static void
accessible_image_view_get_image_size (AtkImage *obj,
gint *width,
gint *height)
{
GtkWidget *widget;
GdkPixbuf *image;
widget = GTK_ACCESSIBLE (obj)->widget;
if (widget == 0)
{
/*
* State is defunct
*/
*width = -1;
*height = -1;
return;
}
image = image_view_get_pixbuf (IMAGE_VIEW (widget));
*height = gdk_pixbuf_get_height(image);
*width = gdk_pixbuf_get_width(image);
}
static void
image_view_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
ImageView *image_view = IMAGE_VIEW (object);
switch (property_id) {
case PROP_INTERP_TYPE:
image_view_set_interp_type (image_view, g_value_get_int (value));
break;
case PROP_CHECK_TYPE:
image_view_set_check_type (image_view, g_value_get_int (value));
break;
case PROP_CHECK_SIZE:
image_view_set_check_size (image_view, g_value_get_int (value));
break;
case PROP_DITHER:
image_view_set_dither (image_view, g_value_get_int (value));
break;
default:
g_warning ("unknown property id `%d'", property_id);
break;
}
}
/* Idle handler for the drawing process. We pull a rectangle from the dirty
* region microtile array, paint it, and leave the rest to the next idle
* iteration.
*/
static gboolean
paint_iteration_idle (gpointer data)
{
ImageView *view;
ImageViewPrivate *priv;
ArtIRect rect;
view = IMAGE_VIEW (data);
priv = view->priv;
g_assert (priv->uta != NULL);
pull_rectangle (priv->uta, &rect, PAINT_RECT_WIDTH, PAINT_RECT_HEIGHT);
if (art_irect_empty (&rect)) {
art_uta_free (priv->uta);
priv->uta = NULL;
} else
paint_rectangle (view, &rect, priv->interp_type);
if (!priv->uta) {
priv->idle_id = 0;
return FALSE;
}
return TRUE;
}
/* Destroy handler for the image view */
static void
image_view_dispose (GObject *object)
{
ImageView *view;
ImageViewPrivate *priv;
view = IMAGE_VIEW (object);
priv = view->priv;
g_signal_handlers_disconnect_matched (
priv->hadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
g_signal_handlers_disconnect_matched (
priv->vadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
/* Clean up */
if (view->priv->pixbuf)
g_object_unref (G_OBJECT (view->priv->pixbuf));
view->priv->pixbuf = NULL;
remove_dirty_region (view);
GNOME_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
/* Unrealize handler for the image view */
static void
image_view_unrealize (GtkWidget *widget)
{
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_IMAGE_VIEW (widget));
remove_dirty_region (IMAGE_VIEW (widget));
if (GTK_WIDGET_CLASS (parent_class)->unrealize)
(* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
/* Callback used when an adjustment is changed */
static void
adjustment_changed_cb (GtkAdjustment *adj, gpointer data)
{
ImageView *view;
ImageViewPrivate *priv;
view = IMAGE_VIEW (data);
priv = view->priv;
scroll_to (view, priv->hadj->value, priv->vadj->value, FALSE);
}
/* Scroll event handler for the image view. We zoom with an event without
* modifiers rather than scroll; we use the Shift modifier to scroll.
* Rationale: images are not primarily vertical, and in EOG you scan scroll by
* dragging the image with button 1 anyways.
*/
static gboolean
image_view_scroll_event (GtkWidget *widget, GdkEventScroll *event)
{
ImageView *view;
ImageViewPrivate *priv;
double zoom_factor;
int xofs, yofs;
view = IMAGE_VIEW (widget);
priv = view->priv;
/* Compute zoom factor and scrolling offsets; we'll only use either of them */
xofs = priv->hadj->page_increment / 2; /* same as in gtkscrolledwindow.c */
yofs = priv->vadj->page_increment / 2;
switch (event->direction) {
case GDK_SCROLL_UP:
zoom_factor = IMAGE_VIEW_ZOOM_MULTIPLIER;
xofs = 0;
yofs = -yofs;
break;
case GDK_SCROLL_LEFT:
zoom_factor = 1.0 / IMAGE_VIEW_ZOOM_MULTIPLIER;
xofs = -xofs;
yofs = 0;
break;
case GDK_SCROLL_DOWN:
zoom_factor = 1.0 / IMAGE_VIEW_ZOOM_MULTIPLIER;
xofs = 0;
yofs = yofs;
break;
case GDK_SCROLL_RIGHT:
zoom_factor = IMAGE_VIEW_ZOOM_MULTIPLIER;
xofs = xofs;
yofs = 0;
break;
default:
g_assert_not_reached ();
return FALSE;
}
if ((event->state & GDK_SHIFT_MASK) == 0)
image_view_set_zoom (view, priv->zoomx * zoom_factor, priv->zoomy * zoom_factor,
TRUE, event->x, event->y);
else
scroll_by (view, xofs, yofs);
return TRUE;
}
/* Button press event handler for the image view */
static gboolean
image_view_button_press_event (GtkWidget *widget, GdkEventButton *event)
{
ImageView *view;
ImageViewPrivate *priv;
GdkCursor *cursor;
view = IMAGE_VIEW (widget);
priv = view->priv;
if (!GTK_WIDGET_HAS_FOCUS (widget))
gtk_widget_grab_focus (widget);
if (priv->dragging)
return FALSE;
switch (event->button) {
case 1:
cursor = cursor_get (widget, CURSOR_HAND_CLOSED);
gdk_window_set_cursor (widget->window, cursor);
gdk_cursor_unref (cursor);
priv->dragging = TRUE;
priv->drag_anchor_x = event->x;
priv->drag_anchor_y = event->y;
priv->drag_ofs_x = priv->xofs;
priv->drag_ofs_y = priv->yofs;
return TRUE;
case 4:
image_view_set_zoom (view,
priv->zoomx * IMAGE_VIEW_ZOOM_MULTIPLIER,
priv->zoomy * IMAGE_VIEW_ZOOM_MULTIPLIER,
TRUE, event->x, event->y);
return TRUE;
case 5:
image_view_set_zoom (view,
priv->zoomx / IMAGE_VIEW_ZOOM_MULTIPLIER,
priv->zoomy / IMAGE_VIEW_ZOOM_MULTIPLIER,
TRUE, event->x, event->y);
return TRUE;
default:
break;
}
return FALSE;
}
/* Size_request handler for the image view */
static void
image_view_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
ImageView *view;
ImageViewPrivate *priv;
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_IMAGE_VIEW (widget));
g_return_if_fail (requisition != NULL);
view = IMAGE_VIEW (widget);
priv = view->priv;
requisition->width = requisition->height = 0;
}
/* Finalize handler for the image view */
static void
image_view_finalize (GObject *object)
{
ImageView *view;
ImageViewPrivate *priv;
view = IMAGE_VIEW (object);
priv = view->priv;
g_object_unref (priv->hadj);
g_object_unref (priv->vadj);
g_free (priv);
GNOME_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}
/* Button release event handler for the image view */
static gboolean
image_view_button_release_event (GtkWidget *widget, GdkEventButton *event)
{
ImageView *view;
ImageViewPrivate *priv;
GdkCursor *cursor;
view = IMAGE_VIEW (widget);
priv = view->priv;
if (!priv->dragging || event->button != 1)
return FALSE;
drag_to (view, event->x, event->y);
priv->dragging = FALSE;
cursor = cursor_get (widget, CURSOR_HAND_OPEN);
gdk_window_set_cursor (widget->window, cursor);
gdk_cursor_unref (cursor);
return TRUE;
}
/* Expose event handler for the image view. First we process the whole dirty
* region by drawing a non-interpolated version, which is "instantaneous", and
* we do this synchronously. Then, if we are set to use interpolation, we queue
* an idle handler to handle interpolated drawing there.
*/
static gboolean
image_view_expose_event (GtkWidget *widget, GdkEventExpose *event)
{
ImageView *view;
GdkRectangle *rects;
gint n_rects;
int i;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (IS_IMAGE_VIEW (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
view = IMAGE_VIEW (widget);
gdk_region_get_rectangles (event->region, &rects, &n_rects);
for (i = 0; i < n_rects; i++)
request_paint_area (view, rects + i);
g_free (rects);
return TRUE;
}
/* Motion event handler for the image view */
static gboolean
image_view_motion_event (GtkWidget *widget, GdkEventMotion *event)
{
ImageView *view;
ImageViewPrivate *priv;
gint x, y;
GdkModifierType mods;
view = IMAGE_VIEW (widget);
priv = view->priv;
if (!priv->dragging)
return FALSE;
if (event->is_hint)
gdk_window_get_pointer (widget->window, &x, &y, &mods);
else {
x = event->x;
y = event->y;
}
drag_to (view, x, y);
return TRUE;
}
/* Size_allocate handler for the image view */
static void
image_view_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
ImageView *view;
ImageViewPrivate *priv;
int xofs, yofs;
int scaled_width, scaled_height;
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_IMAGE_VIEW (widget));
g_return_if_fail (allocation != NULL);
view = IMAGE_VIEW (widget);
priv = view->priv;
/* Compute new scroll offsets */
if (priv->need_zoom_change) {
compute_center_zoom_offsets (view,
widget->allocation.width, widget->allocation.height,
allocation->width, allocation->height,
&xofs, &yofs);
set_default_zoom_anchor (view);
priv->need_zoom_change = FALSE;
} else {
xofs = priv->xofs;
yofs = priv->yofs;
}
/* Resize the window */
widget->allocation = *allocation;
if (GTK_WIDGET_REALIZED (widget))
gdk_window_move_resize (widget->window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
/* Set scroll increments */
compute_scaled_size (view, priv->zoomx, priv->zoomy, &scaled_width, &scaled_height);
priv->hadj->page_size = MIN (scaled_width, allocation->width);
priv->hadj->page_increment = allocation->width / 2;
priv->hadj->step_increment = SCROLL_STEP_SIZE;
priv->vadj->page_size = MIN (scaled_height, allocation->height);
priv->vadj->page_increment = allocation->height / 2;
priv->vadj->step_increment = SCROLL_STEP_SIZE;
/* Set scroll bounds and new offsets */
priv->hadj->lower = 0;
priv->hadj->upper = scaled_width;
xofs = CLAMP (xofs, 0, priv->hadj->upper - priv->hadj->page_size);
priv->vadj->lower = 0;
priv->vadj->upper = scaled_height;
yofs = CLAMP (yofs, 0, priv->vadj->upper - priv->vadj->page_size);
g_signal_emit_by_name (priv->hadj, "changed");
g_signal_emit_by_name (priv->vadj, "changed");
if (priv->hadj->value != xofs) {
priv->hadj->value = xofs;
priv->xofs = xofs;
g_signal_handlers_block_matched (
priv->hadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
g_signal_emit_by_name (priv->hadj, "value_changed");
g_signal_handlers_unblock_matched (
priv->hadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
}
if (priv->vadj->value != yofs) {
priv->vadj->value = yofs;
priv->yofs = yofs;
g_signal_handlers_block_matched (
priv->vadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
g_signal_emit_by_name (priv->vadj, "value_changed");
g_signal_handlers_unblock_matched (
priv->vadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
}
}
/* Set_scroll_adjustments handler for the image view */
static void
image_view_set_scroll_adjustments (GtkWidget *widget,
GtkAdjustment *hadj,
GtkAdjustment *vadj)
{
ImageView *view;
ImageViewPrivate *priv;
gboolean need_adjust;
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_IMAGE_VIEW (widget));
view = IMAGE_VIEW (widget);
priv = view->priv;
if (hadj)
g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
else
hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (vadj)
g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
else
vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (priv->hadj && priv->hadj != hadj) {
g_signal_handlers_disconnect_matched (
priv->hadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
g_object_unref (priv->hadj);
}
if (priv->vadj && priv->vadj != vadj) {
g_signal_handlers_disconnect_matched (
priv->vadj, G_SIGNAL_MATCH_DATA,
0, 0, NULL, NULL, view);
g_object_unref (priv->vadj);
}
need_adjust = FALSE;
if (priv->hadj != hadj) {
priv->hadj = hadj;
g_object_ref (priv->hadj);
gtk_object_sink (GTK_OBJECT (priv->hadj));
g_signal_connect (priv->hadj, "value_changed",
G_CALLBACK (adjustment_changed_cb),
view);
need_adjust = TRUE;
}
if (priv->vadj != vadj) {
priv->vadj = vadj;
g_object_ref (priv->vadj);
gtk_object_sink (GTK_OBJECT (priv->vadj));
g_signal_connect (priv->vadj, "value_changed",
G_CALLBACK (adjustment_changed_cb),
view);
need_adjust = TRUE;
}
if (need_adjust)
adjustment_changed_cb (NULL, view);
}
/* Key press event handler for the image view */
static gboolean
image_view_key_press_event (GtkWidget *widget, GdkEventKey *event)
{
ImageView *view;
ImageViewPrivate *priv;
gboolean do_zoom;
double zoomx, zoomy;
gboolean do_scroll;
int xofs, yofs;
view = IMAGE_VIEW (widget);
priv = view->priv;
do_zoom = FALSE;
do_scroll = FALSE;
xofs = yofs = 0;
zoomx = zoomy = 1.0;
if ((event->state & (GDK_MODIFIER_MASK & ~GDK_LOCK_MASK)) != 0)
return FALSE;
switch (event->keyval) {
case GDK_Up:
do_scroll = TRUE;
xofs = 0;
yofs = -SCROLL_STEP_SIZE;
break;
case GDK_Down:
do_scroll = TRUE;
xofs = 0;
yofs = SCROLL_STEP_SIZE;
break;
case GDK_Left:
do_scroll = TRUE;
xofs = -SCROLL_STEP_SIZE;
yofs = 0;
break;
case GDK_Right:
do_scroll = TRUE;
xofs = SCROLL_STEP_SIZE;
yofs = 0;
break;
case GDK_plus:
case GDK_KP_Add:
do_zoom = TRUE;
zoomx = priv->zoomx * IMAGE_VIEW_ZOOM_MULTIPLIER;
zoomy = priv->zoomy * IMAGE_VIEW_ZOOM_MULTIPLIER;
break;
case GDK_minus:
case GDK_KP_Subtract:
do_zoom = TRUE;
zoomx = priv->zoomx / IMAGE_VIEW_ZOOM_MULTIPLIER;
zoomy = priv->zoomy / IMAGE_VIEW_ZOOM_MULTIPLIER;
break;
case GDK_1:
do_zoom = TRUE;
zoomx = zoomy = 1.0;
break;
case GDK_F:
case GDK_f:
g_signal_emit (view, image_view_signals [ZOOM_FIT], 0);
break;
default:
return FALSE;
}
if (do_zoom) {
gint x, y;
gdk_window_get_pointer (widget->window, &x, &y, NULL);
image_view_set_zoom (view, zoomx, zoomy, TRUE, x, y);
}
if (do_scroll)
scroll_by (view, xofs, yofs);
return TRUE;
}