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-rw-r--r--src/canvas-base.c807
-rw-r--r--src/ganv-private.h12
-rw-r--r--src/item.c785
3 files changed, 825 insertions, 779 deletions
diff --git a/src/canvas-base.c b/src/canvas-base.c
index e30a517..89a3e4e 100644
--- a/src/canvas-base.c
+++ b/src/canvas-base.c
@@ -35,7 +35,6 @@
/* We must run our idle update handler *before* GDK wants to redraw. */
#define CANVAS_IDLE_PRIORITY (GDK_PRIORITY_REDRAW - 5)
-static void ganv_canvas_base_request_update(GanvCanvasBase* canvas);
static void add_idle(GanvCanvasBase* canvas);
typedef struct {
@@ -45,689 +44,6 @@ typedef struct {
int height;
} IRect;
-/* Some convenience stuff */
-#define GCI_UPDATE_MASK (GANV_CANVAS_BASE_UPDATE_REQUESTED | GANV_CANVAS_BASE_UPDATE_AFFINE \
- | GANV_CANVAS_BASE_UPDATE_VISIBILITY)
-
-enum {
- ITEM_PROP_0,
- ITEM_PROP_PARENT,
- ITEM_PROP_X,
- ITEM_PROP_Y,
- ITEM_PROP_MANAGED
-};
-
-enum {
- ITEM_EVENT,
- ITEM_LAST_SIGNAL
-};
-
-static int emit_event(GanvCanvasBase* canvas, GdkEvent* event);
-
-static guint item_signals[ITEM_LAST_SIGNAL];
-
-G_DEFINE_TYPE(GanvItem, ganv_item, GTK_TYPE_OBJECT)
-
-static GtkObjectClass * item_parent_class;
-
-/* Object initialization function for GanvItem */
-static void
-ganv_item_init(GanvItem* item)
-{
- item->object.flags |= GANV_ITEM_VISIBLE;
- item->managed = FALSE;
-}
-
-/**
- * ganv_item_new:
- * @parent: The parent group for the new item.
- * @type: The object type of the item.
- * @first_arg_name: A list of object argument name/value pairs, NULL-terminated,
- * used to configure the item. For example, "fill_color", "black",
- * "width_units", 5.0, NULL.
- * @Varargs:
- *
- * Creates a new canvas item with @parent as its parent group. The item is
- * created at the top of its parent's stack, and starts up as visible. The item
- * is of the specified @type, for example, it can be
- * ganv_canvas_base_rect_get_type(). The list of object arguments/value pairs is
- * used to configure the item. If you need to pass construct time parameters, you
- * should use g_object_new() to pass the parameters and
- * ganv_item_construct() to set up the canvas item.
- *
- * Return value: (transfer full): The newly-created item.
- **/
-GanvItem*
-ganv_item_new(GanvItem* parent, GType type, const gchar* first_arg_name, ...)
-{
- GanvItem* item;
- va_list args;
-
- g_return_val_if_fail(g_type_is_a(type, ganv_item_get_type()), NULL);
-
- item = GANV_ITEM(g_object_new(type, NULL));
-
- va_start(args, first_arg_name);
- ganv_item_construct(item, parent, first_arg_name, args);
- va_end(args);
-
- return item;
-}
-
-/* Performs post-creation operations on a canvas item (adding it to its parent
- * group, etc.)
- */
-static void
-item_post_create_setup(GanvItem* item)
-{
- GanvItemClass* parent_class = GANV_ITEM_GET_CLASS(item->parent);
- if (!item->managed) {
- if (parent_class->add) {
- parent_class->add(item->parent, item);
- } else {
- g_warning("item added to non-parent item\n");
- }
- }
- ganv_canvas_base_request_redraw(item->canvas,
- item->x1, item->y1,
- item->x2 + 1, item->y2 + 1);
- item->canvas->need_repick = TRUE;
-}
-
-/* Set_property handler for canvas items */
-static void
-ganv_item_set_property(GObject* gobject, guint param_id,
- const GValue* value, GParamSpec* pspec)
-{
- g_return_if_fail(GANV_IS_ITEM(gobject));
-
- GanvItem* item = GANV_ITEM(gobject);
-
- switch (param_id) {
- case ITEM_PROP_PARENT:
- if (item->parent != NULL) {
- g_warning("Cannot set `parent' argument after item has "
- "already been constructed.");
- } else if (g_value_get_object(value)) {
- item->parent = GANV_ITEM(g_value_get_object(value));
- item->canvas = item->parent->canvas;
- item_post_create_setup(item);
- }
- break;
- case ITEM_PROP_X:
- item->x = g_value_get_double(value);
- ganv_item_request_update(item);
- break;
- case ITEM_PROP_Y:
- item->y = g_value_get_double(value);
- ganv_item_request_update(item);
- break;
- case ITEM_PROP_MANAGED:
- item->managed = g_value_get_boolean(value);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID(gobject, param_id, pspec);
- break;
- }
-}
-
-/* Get_property handler for canvas items */
-static void
-ganv_item_get_property(GObject* gobject, guint param_id,
- GValue* value, GParamSpec* pspec)
-{
- g_return_if_fail(GANV_IS_ITEM(gobject));
-
- GanvItem* item = GANV_ITEM(gobject);
-
- switch (param_id) {
- case ITEM_PROP_PARENT:
- g_value_set_object(value, item->parent);
- break;
- case ITEM_PROP_X:
- g_value_set_double(value, item->x);
- break;
- case ITEM_PROP_Y:
- g_value_set_double(value, item->y);
- break;
- case ITEM_PROP_MANAGED:
- g_value_set_boolean(value, item->managed);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID(gobject, param_id, pspec);
- break;
- }
-}
-
-/**
- * ganv_item_construct:
- * @item: An unconstructed canvas item.
- * @parent: The parent group for the item.
- * @first_arg_name: The name of the first argument for configuring the item.
- * @args: The list of arguments used to configure the item.
- *
- * Constructs a canvas item; meant for use only by item implementations.
- **/
-void
-ganv_item_construct(GanvItem* item, GanvItem* parent,
- const gchar* first_arg_name, va_list args)
-{
- g_return_if_fail(GANV_IS_ITEM(item));
-
- item->parent = parent;
- item->canvas = item->parent->canvas;
- item->layer = 0;
-
- g_object_set_valist(G_OBJECT(item), first_arg_name, args);
-
- item_post_create_setup(item);
-}
-
-/* If the item is visible, requests a redraw of it. */
-static void
-redraw_if_visible(GanvItem* item)
-{
- if (item->object.flags & GANV_ITEM_VISIBLE) {
- ganv_canvas_base_request_redraw(item->canvas, item->x1, item->y1, item->x2 + 1,
- item->y2 + 1);
- }
-}
-
-/* Standard object dispose function for canvas items */
-static void
-ganv_item_dispose(GObject* object)
-{
- GanvItem* item;
-
- g_return_if_fail(GANV_IS_ITEM(object));
-
- item = GANV_ITEM(object);
-
- if (item->canvas) {
- redraw_if_visible(item);
- }
-
- /* Make the canvas forget about us */
-
- if (item->canvas && item == item->canvas->current_item) {
- item->canvas->current_item = NULL;
- item->canvas->need_repick = TRUE;
- }
-
- if (item->canvas && item == item->canvas->new_current_item) {
- item->canvas->new_current_item = NULL;
- item->canvas->need_repick = TRUE;
- }
-
- if (item->canvas && item == item->canvas->grabbed_item) {
- item->canvas->grabbed_item = NULL;
- gdk_pointer_ungrab(GDK_CURRENT_TIME);
- }
-
- if (item->canvas && item == item->canvas->focused_item) {
- item->canvas->focused_item = NULL;
- }
-
- /* Normal destroy stuff */
-
- if (item->object.flags & GANV_ITEM_MAPPED) {
- (*GANV_ITEM_GET_CLASS(item)->unmap)(item);
- }
-
- if (item->object.flags & GANV_ITEM_REALIZED) {
- (*GANV_ITEM_GET_CLASS(item)->unrealize)(item);
- }
-
- if (!item->managed && item->parent) {
- if (GANV_ITEM_GET_CLASS(item->parent)->remove) {
- GANV_ITEM_GET_CLASS(item->parent)->remove(item->parent, item);
- } else {
- fprintf(stderr, "warning: Item parent has no remove method\n");
- }
- }
-
- G_OBJECT_CLASS(item_parent_class)->dispose(object);
- /* items should remove any reference to item->canvas after the
- first ::destroy */
- item->canvas = NULL;
-}
-
-/* Realize handler for canvas items */
-static void
-ganv_item_realize(GanvItem* item)
-{
- GTK_OBJECT_SET_FLAGS(item, GANV_ITEM_REALIZED);
-
- ganv_item_request_update(item);
-}
-
-/* Unrealize handler for canvas items */
-static void
-ganv_item_unrealize(GanvItem* item)
-{
- GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_REALIZED);
-}
-
-/* Map handler for canvas items */
-static void
-ganv_item_map(GanvItem* item)
-{
- GTK_OBJECT_SET_FLAGS(item, GANV_ITEM_MAPPED);
-}
-
-/* Unmap handler for canvas items */
-static void
-ganv_item_unmap(GanvItem* item)
-{
- GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_MAPPED);
-}
-
-/* Update handler for canvas items */
-static void
-ganv_item_update(GanvItem* item, int flags)
-{
- GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_NEED_UPDATE);
- GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_NEED_VIS);
-}
-
-/* Point handler for canvas items */
-static double
-ganv_item_point(GanvItem* item,
- double x, double y,
- int cx, int cy,
- GanvItem** actual_item)
-{
- *actual_item = NULL;
- return G_MAXDOUBLE;
-}
-
-void
-ganv_item_invoke_update(GanvItem* item, int flags)
-{
- int child_flags = flags;
-
- /* apply object flags to child flags */
-
- child_flags &= ~GANV_CANVAS_BASE_UPDATE_REQUESTED;
-
- if (item->object.flags & GANV_ITEM_NEED_UPDATE) {
- child_flags |= GANV_CANVAS_BASE_UPDATE_REQUESTED;
- }
-
- if (item->object.flags & GANV_ITEM_NEED_VIS) {
- child_flags |= GANV_CANVAS_BASE_UPDATE_VISIBILITY;
- }
-
- if (child_flags & GCI_UPDATE_MASK) {
- if (GANV_ITEM_GET_CLASS(item)->update) {
- GANV_ITEM_GET_CLASS(item)->update(item, child_flags);
- }
- }
-}
-
-/**
- * ganv_item_set:
- * @item: A canvas item.
- * @first_arg_name: The list of object argument name/value pairs used to configure the item.
- * @Varargs:
- *
- * Configures a canvas item. The arguments in the item are set to the specified
- * values, and the item is repainted as appropriate.
- **/
-void
-ganv_item_set(GanvItem* item, const gchar* first_arg_name, ...)
-{
- va_list args;
-
- va_start(args, first_arg_name);
- ganv_item_set_valist(item, first_arg_name, args);
- va_end(args);
-}
-
-/**
- * ganv_item_set_valist:
- * @item: A canvas item.
- * @first_arg_name: The name of the first argument used to configure the item.
- * @args: The list of object argument name/value pairs used to configure the item.
- *
- * Configures a canvas item. The arguments in the item are set to the specified
- * values, and the item is repainted as appropriate.
- **/
-void
-ganv_item_set_valist(GanvItem* item, const gchar* first_arg_name, va_list args)
-{
- g_return_if_fail(GANV_IS_ITEM(item));
-
- g_object_set_valist(G_OBJECT(item), first_arg_name, args);
-
- item->canvas->need_repick = TRUE;
-}
-
-void
-ganv_item_raise(GanvItem* item)
-{
- ++item->layer;
-}
-
-void
-ganv_item_lower(GanvItem* item)
-{
- --item->layer;
-}
-
-/**
- * ganv_item_move:
- * @item: A canvas item.
- * @dx: Horizontal offset.
- * @dy: Vertical offset.
- **/
-void
-ganv_item_move(GanvItem* item, double dx, double dy)
-{
- if (!item || !GANV_IS_ITEM(item)) {
- return;
- }
-
- item->x += dx;
- item->y += dy;
-
- ganv_item_request_update(item);
- item->canvas->need_repick = TRUE;
-}
-
-/**
- * ganv_item_show:
- * @item: A canvas item.
- *
- * Shows a canvas item. If the item was already shown, then no action is taken.
- **/
-void
-ganv_item_show(GanvItem* item)
-{
- g_return_if_fail(GANV_IS_ITEM(item));
-
- if (!(item->object.flags & GANV_ITEM_VISIBLE)) {
- item->object.flags |= GANV_ITEM_VISIBLE;
- ganv_canvas_base_request_redraw(item->canvas, item->x1, item->y1, item->x2 + 1,
- item->y2 + 1);
- item->canvas->need_repick = TRUE;
- }
-}
-
-/**
- * ganv_item_hide:
- * @item: A canvas item.
- *
- * Hides a canvas item. If the item was already hidden, then no action is
- * taken.
- **/
-void
-ganv_item_hide(GanvItem* item)
-{
- g_return_if_fail(GANV_IS_ITEM(item));
-
- if (item->object.flags & GANV_ITEM_VISIBLE) {
- item->object.flags &= ~GANV_ITEM_VISIBLE;
- ganv_canvas_base_request_redraw(item->canvas, item->x1, item->y1, item->x2 + 1,
- item->y2 + 1);
- item->canvas->need_repick = TRUE;
- }
-}
-
-/**
- * ganv_item_grab:
- * @item: A canvas item.
- * @event_mask: Mask of events that will be sent to this item.
- * @cursor: If non-NULL, the cursor that will be used while the grab is active.
- * @etime: The timestamp required for grabbing the mouse, or GDK_CURRENT_TIME.
- *
- * Specifies that all events that match the specified event mask should be sent
- * to the specified item, and also grabs the mouse by calling
- * gdk_pointer_grab(). The event mask is also used when grabbing the pointer.
- * If @cursor is not NULL, then that cursor is used while the grab is active.
- * The @etime parameter is the timestamp required for grabbing the mouse.
- *
- * Return value: If an item was already grabbed, it returns %GDK_GRAB_ALREADY_GRABBED. If
- * the specified item was hidden by calling ganv_item_hide(), then it
- * returns %GDK_GRAB_NOT_VIEWABLE. Else, it returns the result of calling
- * gdk_pointer_grab().
- **/
-int
-ganv_item_grab(GanvItem* item, guint event_mask, GdkCursor* cursor, guint32 etime)
-{
- int retval;
-
- g_return_val_if_fail(GANV_IS_ITEM(item), GDK_GRAB_NOT_VIEWABLE);
- g_return_val_if_fail(GTK_WIDGET_MAPPED(item->canvas), GDK_GRAB_NOT_VIEWABLE);
-
- if (item->canvas->grabbed_item) {
- return GDK_GRAB_ALREADY_GRABBED;
- }
-
- if (!(item->object.flags & GANV_ITEM_VISIBLE)) {
- return GDK_GRAB_NOT_VIEWABLE;
- }
-
- retval = gdk_pointer_grab(item->canvas->layout.bin_window,
- FALSE,
- event_mask,
- NULL,
- cursor,
- etime);
-
- if (retval != GDK_GRAB_SUCCESS) {
- return retval;
- }
-
- item->canvas->grabbed_item = item;
- item->canvas->grabbed_event_mask = event_mask;
- item->canvas->current_item = item; /* So that events go to the grabbed item */
-
- return retval;
-}
-
-/**
- * ganv_item_ungrab:
- * @item: A canvas item that holds a grab.
- * @etime: The timestamp for ungrabbing the mouse.
- *
- * Ungrabs the item, which must have been grabbed in the canvas, and ungrabs the
- * mouse.
- **/
-void
-ganv_item_ungrab(GanvItem* item, guint32 etime)
-{
- g_return_if_fail(GANV_IS_ITEM(item));
-
- if (item->canvas->grabbed_item != item) {
- return;
- }
-
- item->canvas->grabbed_item = NULL;
-
- gdk_pointer_ungrab(etime);
-}
-
-void
-ganv_item_i2w_offset(GanvItem* item, double* px, double* py)
-{
- double x = 0.0;
- double y = 0.0;
- while (item) {
- x += item->x;
- y += item->y;
- item = item->parent;
- }
- *px = x;
- *py = y;
-}
-
-/**
- * ganv_item_i2w:
- * @item: A canvas item.
- * @x: X coordinate to convert (input/output value).
- * @y: Y coordinate to convert (input/output value).
- *
- * Converts a coordinate pair from item-relative coordinates to world
- * coordinates.
- **/
-void
-ganv_item_i2w(GanvItem* item, double* x, double* y)
-{
- /*g_return_if_fail(GANV_IS_ITEM(item));
- g_return_if_fail(x != NULL);
- g_return_if_fail(y != NULL);*/
-
- double off_x;
- double off_y;
- ganv_item_i2w_offset(item, &off_x, &off_y);
-
- *x += off_x;
- *y += off_y;
-}
-
-void
-ganv_item_i2w_pair(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
-{
- double off_x;
- double off_y;
- ganv_item_i2w_offset(item, &off_x, &off_y);
-
- *x1 += off_x;
- *y1 += off_y;
- *x2 += off_x;
- *y2 += off_y;
-}
-
-/**
- * ganv_item_w2i:
- * @item: A canvas item.
- * @x: X coordinate to convert (input/output value).
- * @y: Y coordinate to convert (input/output value).
- *
- * Converts a coordinate pair from world coordinates to item-relative
- * coordinates.
- **/
-void
-ganv_item_w2i(GanvItem* item, double* x, double* y)
-{
- double off_x;
- double off_y;
- ganv_item_i2w_offset(item, &off_x, &off_y);
-
- *x -= off_x;
- *y -= off_y;
-}
-
-/* Returns whether the item is an inferior of or is equal to the parent. */
-static gboolean
-is_descendant(GanvItem* item, GanvItem* parent)
-{
- for (; item; item = item->parent) {
- if (item == parent) {
- return TRUE;
- }
- }
-
- return FALSE;
-}
-
-/**
- * ganv_item_grab_focus:
- * @item: A canvas item.
- *
- * Makes the specified item take the keyboard focus, so all keyboard events will
- * be sent to it. If the canvas widget itself did not have the focus, it grabs
- * it as well.
- **/
-void
-ganv_item_grab_focus(GanvItem* item)
-{
- GanvItem* focused_item;
- GdkEvent ev;
-
- g_return_if_fail(GANV_IS_ITEM(item));
- g_return_if_fail(GTK_WIDGET_CAN_FOCUS(GTK_WIDGET(item->canvas)));
-
- focused_item = item->canvas->focused_item;
-
- if (focused_item) {
- ev.focus_change.type = GDK_FOCUS_CHANGE;
- ev.focus_change.window = GTK_LAYOUT(item->canvas)->bin_window;
- ev.focus_change.send_event = FALSE;
- ev.focus_change.in = FALSE;
-
- emit_event(item->canvas, &ev);
- }
-
- item->canvas->focused_item = item;
- gtk_widget_grab_focus(GTK_WIDGET(item->canvas));
-
- if (focused_item) {
- ev.focus_change.type = GDK_FOCUS_CHANGE;
- ev.focus_change.window = GTK_LAYOUT(item->canvas)->bin_window;
- ev.focus_change.send_event = FALSE;
- ev.focus_change.in = TRUE;
-
- emit_event(item->canvas, &ev);
- }
-}
-
-static void
-ganv_item_default_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
-{
- *x1 = *y1 = *x2 = *y2 = 0.0;
-}
-
-/**
- * ganv_item_get_bounds:
- * @item: A canvas item.
- * @x1: Leftmost edge of the bounding box (return value).
- * @y1: Upper edge of the bounding box (return value).
- * @x2: Rightmost edge of the bounding box (return value).
- * @y2: Lower edge of the bounding box (return value).
- *
- * Queries the bounding box of a canvas item. The bounds are returned in the
- * coordinate system of the item's parent.
- **/
-void
-ganv_item_get_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
-{
- GANV_ITEM_GET_CLASS(item)->bounds(item, x1, y1, x2, y2);
-}
-
-/**
- * ganv_item_request_update:
- * @item: A canvas item.
- *
- * To be used only by item implementations. Requests that the canvas queue an
- * update for the specified item.
- **/
-void
-ganv_item_request_update(GanvItem* item)
-{
- /* Note: At some point, if this short-circuit was enabled, the canvas stopped
- updating items entirely when connected modules are removed. */
- if (item->object.flags & GANV_ITEM_NEED_UPDATE) {
- return;
- }
-
- if (!item->canvas) {
- /* Item is being / has been destroyed, ignore */
- return;
- }
-
- item->object.flags |= GANV_ITEM_NEED_UPDATE;
-
- if (item->parent != NULL) {
- /* Recurse up the tree */
- ganv_item_request_update(item->parent);
- } else {
- /* Have reached the top of the tree, make sure the update call gets scheduled. */
- ganv_canvas_base_request_update(item->canvas);
- }
-}
-
/*** GanvCanvasBase ***/
static void ganv_canvas_base_destroy(GtkObject* object);
@@ -1207,12 +523,25 @@ ganv_canvas_base_size_allocate(GtkWidget* widget, GtkAllocation* allocation)
g_signal_emit_by_name(canvas->layout.vadjustment, "changed");
}
+/* Returns whether the item is an inferior of or is equal to the parent. */
+static gboolean
+is_descendant(GanvItem* item, GanvItem* parent)
+{
+ for (; item; item = item->parent) {
+ if (item == parent) {
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+
/* Emits an event for an item in the canvas, be it the current item, grabbed
* item, or focused item, as appropriate.
*/
-
-static int
-emit_event(GanvCanvasBase* canvas, GdkEvent* event)
+int
+ganv_canvas_base_emit_event(GanvCanvasBase* canvas, GdkEvent* event)
{
GdkEvent* ev;
gint finished;
@@ -1326,8 +655,7 @@ emit_event(GanvCanvasBase* canvas, GdkEvent* event)
while (item && !finished) {
g_object_ref(G_OBJECT(item));
- g_signal_emit(item, item_signals[ITEM_EVENT], 0,
- ev, &finished);
+ ganv_item_emit_event(item, ev, &finished);
parent = item->parent;
g_object_unref(G_OBJECT(item));
@@ -1461,11 +789,11 @@ pick_current_item(GanvCanvasBase* canvas, GdkEvent* event)
new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
new_event.crossing.subwindow = NULL;
canvas->in_repick = TRUE;
- retval = emit_event(canvas, &new_event);
+ retval = ganv_canvas_base_emit_event(canvas, &new_event);
canvas->in_repick = FALSE;
}
- /* new_current_item may have been set to NULL during the call to emit_event() above */
+ /* new_current_item may have been set to NULL during the call to ganv_canvas_base_emit_event() above */
if ((canvas->new_current_item != canvas->current_item) && button_down) {
canvas->left_grabbed_item = TRUE;
@@ -1484,7 +812,7 @@ pick_current_item(GanvCanvasBase* canvas, GdkEvent* event)
new_event.type = GDK_ENTER_NOTIFY;
new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
new_event.crossing.subwindow = NULL;
- retval = emit_event(canvas, &new_event);
+ retval = ganv_canvas_base_emit_event(canvas, &new_event);
}
return retval;
@@ -1543,7 +871,7 @@ ganv_canvas_base_button(GtkWidget* widget, GdkEventButton* event)
canvas->state = event->state;
pick_current_item(canvas, (GdkEvent*)event);
canvas->state ^= mask;
- retval = emit_event(canvas, (GdkEvent*)event);
+ retval = ganv_canvas_base_emit_event(canvas, (GdkEvent*)event);
break;
case GDK_BUTTON_RELEASE:
@@ -1551,7 +879,7 @@ ganv_canvas_base_button(GtkWidget* widget, GdkEventButton* event)
* after the button has been released
*/
canvas->state = event->state;
- retval = emit_event(canvas, (GdkEvent*)event);
+ retval = ganv_canvas_base_emit_event(canvas, (GdkEvent*)event);
event->state ^= mask;
canvas->state = event->state;
pick_current_item(canvas, (GdkEvent*)event);
@@ -1582,7 +910,7 @@ ganv_canvas_base_motion(GtkWidget* widget, GdkEventMotion* event)
canvas->state = event->state;
pick_current_item(canvas, (GdkEvent*)event);
- return emit_event(canvas, (GdkEvent*)event);
+ return ganv_canvas_base_emit_event(canvas, (GdkEvent*)event);
}
static gboolean
@@ -1601,7 +929,7 @@ ganv_canvas_base_scroll(GtkWidget* widget, GdkEventScroll* event)
canvas->state = event->state;
pick_current_item(canvas, (GdkEvent*)event);
- return emit_event(canvas, (GdkEvent*)event);
+ return ganv_canvas_base_emit_event(canvas, (GdkEvent*)event);
}
/* Key event handler for the canvas */
@@ -1615,7 +943,7 @@ ganv_canvas_base_key(GtkWidget* widget, GdkEventKey* event)
canvas = GANV_CANVAS_BASE(widget);
- if (!emit_event(canvas, (GdkEvent*)event)) {
+ if (!ganv_canvas_base_emit_event(canvas, (GdkEvent*)event)) {
GtkWidgetClass* widget_class;
widget_class = GTK_WIDGET_CLASS(canvas_parent_class);
@@ -1668,7 +996,7 @@ ganv_canvas_base_focus_in(GtkWidget* widget, GdkEventFocus* event)
canvas = GANV_CANVAS_BASE(widget);
if (canvas->focused_item) {
- return emit_event(canvas, (GdkEvent*)event);
+ return ganv_canvas_base_emit_event(canvas, (GdkEvent*)event);
} else {
return FALSE;
}
@@ -1685,7 +1013,7 @@ ganv_canvas_base_focus_out(GtkWidget* widget, GdkEventFocus* event)
canvas = GANV_CANVAS_BASE(widget);
if (canvas->focused_item) {
- return emit_event(canvas, (GdkEvent*)event);
+ return ganv_canvas_base_emit_event(canvas, (GdkEvent*)event);
} else {
return FALSE;
}
@@ -2176,7 +1504,7 @@ ganv_canvas_base_get_item_at(GanvCanvasBase* canvas, double x, double y)
}
/* Queues an update of the canvas */
-static void
+void
ganv_canvas_base_request_update(GanvCanvasBase* canvas)
{
GANV_CANVAS_BASE_GET_CLASS(canvas)->request_update(canvas);
@@ -2422,82 +1750,3 @@ ganv_canvas_base_world_to_window(GanvCanvasBase* canvas, double worldx, double w
*winy = (canvas->pixels_per_unit) * (worldy - canvas->scroll_y1) + canvas->zoom_yofs;
}
}
-
-static gboolean
-boolean_handled_accumulator(GSignalInvocationHint* ihint,
- GValue* return_accu,
- const GValue* handler_return,
- gpointer dummy)
-{
- gboolean continue_emission;
- gboolean signal_handled;
-
- signal_handled = g_value_get_boolean(handler_return);
- g_value_set_boolean(return_accu, signal_handled);
- continue_emission = !signal_handled;
-
- return continue_emission;
-}
-
-/* Class initialization function for GanvItemClass */
-static void
-ganv_item_class_init(GanvItemClass* klass)
-{
- GObjectClass* gobject_class;
-
- gobject_class = (GObjectClass*)klass;
-
- item_parent_class = (GtkObjectClass*)g_type_class_peek_parent(klass);
-
- gobject_class->set_property = ganv_item_set_property;
- gobject_class->get_property = ganv_item_get_property;
-
- g_object_class_install_property
- (gobject_class, ITEM_PROP_PARENT,
- g_param_spec_object("parent", NULL, NULL,
- GANV_TYPE_ITEM,
- (G_PARAM_READABLE | G_PARAM_WRITABLE)));
-
- g_object_class_install_property
- (gobject_class, ITEM_PROP_X,
- g_param_spec_double("x",
- _("X"),
- _("X"),
- -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
- (G_PARAM_READABLE | G_PARAM_WRITABLE)));
- g_object_class_install_property
- (gobject_class, ITEM_PROP_Y,
- g_param_spec_double("y",
- _("Y"),
- _("Y"),
- -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
- (G_PARAM_READABLE | G_PARAM_WRITABLE)));
-
- g_object_class_install_property
- (gobject_class, ITEM_PROP_MANAGED,
- g_param_spec_boolean("managed",
- _("Managed"),
- _("Whether the item is managed by its parent"),
- 0,
- (G_PARAM_READABLE | G_PARAM_WRITABLE)));
-
- item_signals[ITEM_EVENT]
- = g_signal_new("event",
- G_TYPE_FROM_CLASS(klass),
- G_SIGNAL_RUN_LAST,
- G_STRUCT_OFFSET(GanvItemClass, event),
- boolean_handled_accumulator, NULL,
- ganv_marshal_BOOLEAN__BOXED,
- G_TYPE_BOOLEAN, 1,
- GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
-
- gobject_class->dispose = ganv_item_dispose;
-
- klass->realize = ganv_item_realize;
- klass->unrealize = ganv_item_unrealize;
- klass->map = ganv_item_map;
- klass->unmap = ganv_item_unmap;
- klass->update = ganv_item_update;
- klass->point = ganv_item_point;
- klass->bounds = ganv_item_default_bounds;
-}
diff --git a/src/ganv-private.h b/src/ganv-private.h
index 2a4dbe2..d70f00c 100644
--- a/src/ganv-private.h
+++ b/src/ganv-private.h
@@ -206,6 +206,18 @@ ganv_item_i2w_pair(GanvItem* item, double* x1, double* y1, double* x2, double* y
void
ganv_item_invoke_update(GanvItem* item, int flags);
+void
+ganv_item_emit_event(GanvItem* item, GdkEvent* event, gint* finished);
+
+/* CanvasBase */
+
+void
+ganv_canvas_base_request_update(GanvCanvasBase* canvas);
+
+int
+ganv_canvas_base_emit_event(GanvCanvasBase* canvas, GdkEvent* event);
+
+
/* Edge */
void
diff --git a/src/item.c b/src/item.c
new file mode 100644
index 0000000..6fcd110
--- /dev/null
+++ b/src/item.c
@@ -0,0 +1,785 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2013 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on GnomeCanvas, by Federico Mena <federico@nuclecu.unam.mx>
+ * and Raph Levien <raph@gimp.org>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#include "ganv/canvas.h"
+#include "ganv/canvas-base.h"
+#include "ganv/node.h"
+
+#include "./boilerplate.h"
+#include "./ganv-marshal.h"
+#include "./ganv-private.h"
+#include "./gettext.h"
+
+#define GCI_UPDATE_MASK (GANV_CANVAS_BASE_UPDATE_REQUESTED \
+ | GANV_CANVAS_BASE_UPDATE_AFFINE \
+ | GANV_CANVAS_BASE_UPDATE_VISIBILITY)
+
+enum {
+ ITEM_PROP_0,
+ ITEM_PROP_PARENT,
+ ITEM_PROP_X,
+ ITEM_PROP_Y,
+ ITEM_PROP_MANAGED
+};
+
+enum {
+ ITEM_EVENT,
+ ITEM_LAST_SIGNAL
+};
+
+static guint item_signals[ITEM_LAST_SIGNAL];
+
+G_DEFINE_TYPE(GanvItem, ganv_item, GTK_TYPE_OBJECT)
+
+static GtkObjectClass * item_parent_class;
+
+/* Object initialization function for GanvItem */
+static void
+ganv_item_init(GanvItem* item)
+{
+ item->object.flags |= GANV_ITEM_VISIBLE;
+ item->managed = FALSE;
+}
+
+/**
+ * ganv_item_new:
+ * @parent: The parent group for the new item.
+ * @type: The object type of the item.
+ * @first_arg_name: A list of object argument name/value pairs, NULL-terminated,
+ * used to configure the item. For example, "fill_color", "black",
+ * "width_units", 5.0, NULL.
+ * @Varargs:
+ *
+ * Creates a new canvas item with @parent as its parent group. The item is
+ * created at the top of its parent's stack, and starts up as visible. The item
+ * is of the specified @type, for example, it can be
+ * ganv_canvas_base_rect_get_type(). The list of object arguments/value pairs is
+ * used to configure the item. If you need to pass construct time parameters, you
+ * should use g_object_new() to pass the parameters and
+ * ganv_item_construct() to set up the canvas item.
+ *
+ * Return value: (transfer full): The newly-created item.
+ **/
+GanvItem*
+ganv_item_new(GanvItem* parent, GType type, const gchar* first_arg_name, ...)
+{
+ GanvItem* item;
+ va_list args;
+
+ g_return_val_if_fail(g_type_is_a(type, ganv_item_get_type()), NULL);
+
+ item = GANV_ITEM(g_object_new(type, NULL));
+
+ va_start(args, first_arg_name);
+ ganv_item_construct(item, parent, first_arg_name, args);
+ va_end(args);
+
+ return item;
+}
+
+/* Performs post-creation operations on a canvas item (adding it to its parent
+ * group, etc.)
+ */
+static void
+item_post_create_setup(GanvItem* item)
+{
+ GanvItemClass* parent_class = GANV_ITEM_GET_CLASS(item->parent);
+ if (!item->managed) {
+ if (parent_class->add) {
+ parent_class->add(item->parent, item);
+ } else {
+ g_warning("item added to non-parent item\n");
+ }
+ }
+ ganv_canvas_base_request_redraw(item->canvas,
+ item->x1, item->y1,
+ item->x2 + 1, item->y2 + 1);
+ item->canvas->need_repick = TRUE;
+}
+
+static void
+ganv_item_set_property(GObject* object,
+ guint prop_id,
+ const GValue* value,
+ GParamSpec* pspec)
+{
+ g_return_if_fail(object != NULL);
+ g_return_if_fail(GANV_IS_ITEM(object));
+
+ GanvItem* item = GANV_ITEM(object);
+
+ switch (prop_id) {
+ case ITEM_PROP_PARENT:
+ if (item->parent != NULL) {
+ g_warning("Cannot set `parent' argument after item has "
+ "already been constructed.");
+ } else if (g_value_get_object(value)) {
+ item->parent = GANV_ITEM(g_value_get_object(value));
+ item->canvas = item->parent->canvas;
+ item_post_create_setup(item);
+ }
+ break;
+ case ITEM_PROP_X:
+ item->x = g_value_get_double(value);
+ ganv_item_request_update(item);
+ break;
+ case ITEM_PROP_Y:
+ item->y = g_value_get_double(value);
+ ganv_item_request_update(item);
+ break;
+ case ITEM_PROP_MANAGED:
+ item->managed = g_value_get_boolean(value);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+ganv_item_get_property(GObject* object,
+ guint prop_id,
+ GValue* value,
+ GParamSpec* pspec)
+{
+ g_return_if_fail(object != NULL);
+ g_return_if_fail(GANV_IS_ITEM(object));
+
+ GanvItem* item = GANV_ITEM(object);
+
+ switch (prop_id) {
+ case ITEM_PROP_PARENT:
+ g_value_set_object(value, item->parent);
+ break;
+ case ITEM_PROP_X:
+ g_value_set_double(value, item->x);
+ break;
+ case ITEM_PROP_Y:
+ g_value_set_double(value, item->y);
+ break;
+ case ITEM_PROP_MANAGED:
+ g_value_set_boolean(value, item->managed);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+ break;
+ }
+}
+
+/**
+ * ganv_item_construct:
+ * @item: An unconstructed canvas item.
+ * @parent: The parent group for the item.
+ * @first_arg_name: The name of the first argument for configuring the item.
+ * @args: The list of arguments used to configure the item.
+ *
+ * Constructs a canvas item; meant for use only by item implementations.
+ **/
+void
+ganv_item_construct(GanvItem* item, GanvItem* parent,
+ const gchar* first_arg_name, va_list args)
+{
+ g_return_if_fail(GANV_IS_ITEM(item));
+
+ item->parent = parent;
+ item->canvas = item->parent->canvas;
+ item->layer = 0;
+
+ g_object_set_valist(G_OBJECT(item), first_arg_name, args);
+
+ item_post_create_setup(item);
+}
+
+/* If the item is visible, requests a redraw of it. */
+static void
+redraw_if_visible(GanvItem* item)
+{
+ if (item->object.flags & GANV_ITEM_VISIBLE) {
+ ganv_canvas_base_request_redraw(item->canvas, item->x1, item->y1, item->x2 + 1,
+ item->y2 + 1);
+ }
+}
+
+/* Standard object dispose function for canvas items */
+static void
+ganv_item_dispose(GObject* object)
+{
+ GanvItem* item;
+
+ g_return_if_fail(GANV_IS_ITEM(object));
+
+ item = GANV_ITEM(object);
+
+ if (item->canvas) {
+ redraw_if_visible(item);
+ }
+
+ /* Make the canvas forget about us */
+
+ if (item->canvas && item == item->canvas->current_item) {
+ item->canvas->current_item = NULL;
+ item->canvas->need_repick = TRUE;
+ }
+
+ if (item->canvas && item == item->canvas->new_current_item) {
+ item->canvas->new_current_item = NULL;
+ item->canvas->need_repick = TRUE;
+ }
+
+ if (item->canvas && item == item->canvas->grabbed_item) {
+ item->canvas->grabbed_item = NULL;
+ gdk_pointer_ungrab(GDK_CURRENT_TIME);
+ }
+
+ if (item->canvas && item == item->canvas->focused_item) {
+ item->canvas->focused_item = NULL;
+ }
+
+ /* Normal destroy stuff */
+
+ if (item->object.flags & GANV_ITEM_MAPPED) {
+ (*GANV_ITEM_GET_CLASS(item)->unmap)(item);
+ }
+
+ if (item->object.flags & GANV_ITEM_REALIZED) {
+ (*GANV_ITEM_GET_CLASS(item)->unrealize)(item);
+ }
+
+ if (!item->managed && item->parent) {
+ if (GANV_ITEM_GET_CLASS(item->parent)->remove) {
+ GANV_ITEM_GET_CLASS(item->parent)->remove(item->parent, item);
+ } else {
+ fprintf(stderr, "warning: Item parent has no remove method\n");
+ }
+ }
+
+ G_OBJECT_CLASS(item_parent_class)->dispose(object);
+ /* items should remove any reference to item->canvas after the
+ first ::destroy */
+ item->canvas = NULL;
+}
+
+/* Realize handler for canvas items */
+static void
+ganv_item_realize(GanvItem* item)
+{
+ GTK_OBJECT_SET_FLAGS(item, GANV_ITEM_REALIZED);
+
+ ganv_item_request_update(item);
+}
+
+/* Unrealize handler for canvas items */
+static void
+ganv_item_unrealize(GanvItem* item)
+{
+ GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_REALIZED);
+}
+
+/* Map handler for canvas items */
+static void
+ganv_item_map(GanvItem* item)
+{
+ GTK_OBJECT_SET_FLAGS(item, GANV_ITEM_MAPPED);
+}
+
+/* Unmap handler for canvas items */
+static void
+ganv_item_unmap(GanvItem* item)
+{
+ GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_MAPPED);
+}
+
+/* Update handler for canvas items */
+static void
+ganv_item_update(GanvItem* item, int flags)
+{
+ GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_NEED_UPDATE);
+ GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_NEED_VIS);
+}
+
+/* Point handler for canvas items */
+static double
+ganv_item_point(GanvItem* item,
+ double x, double y,
+ int cx, int cy,
+ GanvItem** actual_item)
+{
+ *actual_item = NULL;
+ return G_MAXDOUBLE;
+}
+
+void
+ganv_item_invoke_update(GanvItem* item, int flags)
+{
+ int child_flags = flags;
+
+ /* apply object flags to child flags */
+
+ child_flags &= ~GANV_CANVAS_BASE_UPDATE_REQUESTED;
+
+ if (item->object.flags & GANV_ITEM_NEED_UPDATE) {
+ child_flags |= GANV_CANVAS_BASE_UPDATE_REQUESTED;
+ }
+
+ if (item->object.flags & GANV_ITEM_NEED_VIS) {
+ child_flags |= GANV_CANVAS_BASE_UPDATE_VISIBILITY;
+ }
+
+ if (child_flags & GCI_UPDATE_MASK) {
+ if (GANV_ITEM_GET_CLASS(item)->update) {
+ GANV_ITEM_GET_CLASS(item)->update(item, child_flags);
+ }
+ }
+}
+
+/**
+ * ganv_item_set:
+ * @item: A canvas item.
+ * @first_arg_name: The list of object argument name/value pairs used to configure the item.
+ * @Varargs:
+ *
+ * Configures a canvas item. The arguments in the item are set to the specified
+ * values, and the item is repainted as appropriate.
+ **/
+void
+ganv_item_set(GanvItem* item, const gchar* first_arg_name, ...)
+{
+ va_list args;
+
+ va_start(args, first_arg_name);
+ ganv_item_set_valist(item, first_arg_name, args);
+ va_end(args);
+}
+
+/**
+ * ganv_item_set_valist:
+ * @item: A canvas item.
+ * @first_arg_name: The name of the first argument used to configure the item.
+ * @args: The list of object argument name/value pairs used to configure the item.
+ *
+ * Configures a canvas item. The arguments in the item are set to the specified
+ * values, and the item is repainted as appropriate.
+ **/
+void
+ganv_item_set_valist(GanvItem* item, const gchar* first_arg_name, va_list args)
+{
+ g_return_if_fail(GANV_IS_ITEM(item));
+
+ g_object_set_valist(G_OBJECT(item), first_arg_name, args);
+
+ item->canvas->need_repick = TRUE;
+}
+
+void
+ganv_item_raise(GanvItem* item)
+{
+ ++item->layer;
+}
+
+void
+ganv_item_lower(GanvItem* item)
+{
+ --item->layer;
+}
+
+/**
+ * ganv_item_move:
+ * @item: A canvas item.
+ * @dx: Horizontal offset.
+ * @dy: Vertical offset.
+ **/
+void
+ganv_item_move(GanvItem* item, double dx, double dy)
+{
+ if (!item || !GANV_IS_ITEM(item)) {
+ return;
+ }
+
+ item->x += dx;
+ item->y += dy;
+
+ ganv_item_request_update(item);
+ item->canvas->need_repick = TRUE;
+}
+
+/**
+ * ganv_item_show:
+ * @item: A canvas item.
+ *
+ * Shows a canvas item. If the item was already shown, then no action is taken.
+ **/
+void
+ganv_item_show(GanvItem* item)
+{
+ g_return_if_fail(GANV_IS_ITEM(item));
+
+ if (!(item->object.flags & GANV_ITEM_VISIBLE)) {
+ item->object.flags |= GANV_ITEM_VISIBLE;
+ ganv_canvas_base_request_redraw(item->canvas, item->x1, item->y1, item->x2 + 1,
+ item->y2 + 1);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+/**
+ * ganv_item_hide:
+ * @item: A canvas item.
+ *
+ * Hides a canvas item. If the item was already hidden, then no action is
+ * taken.
+ **/
+void
+ganv_item_hide(GanvItem* item)
+{
+ g_return_if_fail(GANV_IS_ITEM(item));
+
+ if (item->object.flags & GANV_ITEM_VISIBLE) {
+ item->object.flags &= ~GANV_ITEM_VISIBLE;
+ ganv_canvas_base_request_redraw(item->canvas, item->x1, item->y1, item->x2 + 1,
+ item->y2 + 1);
+ item->canvas->need_repick = TRUE;
+ }
+}
+
+/**
+ * ganv_item_grab:
+ * @item: A canvas item.
+ * @event_mask: Mask of events that will be sent to this item.
+ * @cursor: If non-NULL, the cursor that will be used while the grab is active.
+ * @etime: The timestamp required for grabbing the mouse, or GDK_CURRENT_TIME.
+ *
+ * Specifies that all events that match the specified event mask should be sent
+ * to the specified item, and also grabs the mouse by calling
+ * gdk_pointer_grab(). The event mask is also used when grabbing the pointer.
+ * If @cursor is not NULL, then that cursor is used while the grab is active.
+ * The @etime parameter is the timestamp required for grabbing the mouse.
+ *
+ * Return value: If an item was already grabbed, it returns %GDK_GRAB_ALREADY_GRABBED. If
+ * the specified item was hidden by calling ganv_item_hide(), then it
+ * returns %GDK_GRAB_NOT_VIEWABLE. Else, it returns the result of calling
+ * gdk_pointer_grab().
+ **/
+int
+ganv_item_grab(GanvItem* item, guint event_mask, GdkCursor* cursor, guint32 etime)
+{
+ int retval;
+
+ g_return_val_if_fail(GANV_IS_ITEM(item), GDK_GRAB_NOT_VIEWABLE);
+ g_return_val_if_fail(GTK_WIDGET_MAPPED(item->canvas), GDK_GRAB_NOT_VIEWABLE);
+
+ if (item->canvas->grabbed_item) {
+ return GDK_GRAB_ALREADY_GRABBED;
+ }
+
+ if (!(item->object.flags & GANV_ITEM_VISIBLE)) {
+ return GDK_GRAB_NOT_VIEWABLE;
+ }
+
+ retval = gdk_pointer_grab(item->canvas->layout.bin_window,
+ FALSE,
+ event_mask,
+ NULL,
+ cursor,
+ etime);
+
+ if (retval != GDK_GRAB_SUCCESS) {
+ return retval;
+ }
+
+ item->canvas->grabbed_item = item;
+ item->canvas->grabbed_event_mask = event_mask;
+ item->canvas->current_item = item; /* So that events go to the grabbed item */
+
+ return retval;
+}
+
+/**
+ * ganv_item_ungrab:
+ * @item: A canvas item that holds a grab.
+ * @etime: The timestamp for ungrabbing the mouse.
+ *
+ * Ungrabs the item, which must have been grabbed in the canvas, and ungrabs the
+ * mouse.
+ **/
+void
+ganv_item_ungrab(GanvItem* item, guint32 etime)
+{
+ g_return_if_fail(GANV_IS_ITEM(item));
+
+ if (item->canvas->grabbed_item != item) {
+ return;
+ }
+
+ item->canvas->grabbed_item = NULL;
+
+ gdk_pointer_ungrab(etime);
+}
+
+void
+ganv_item_i2w_offset(GanvItem* item, double* px, double* py)
+{
+ double x = 0.0;
+ double y = 0.0;
+ while (item) {
+ x += item->x;
+ y += item->y;
+ item = item->parent;
+ }
+ *px = x;
+ *py = y;
+}
+
+/**
+ * ganv_item_i2w:
+ * @item: A canvas item.
+ * @x: X coordinate to convert (input/output value).
+ * @y: Y coordinate to convert (input/output value).
+ *
+ * Converts a coordinate pair from item-relative coordinates to world
+ * coordinates.
+ **/
+void
+ganv_item_i2w(GanvItem* item, double* x, double* y)
+{
+ /*g_return_if_fail(GANV_IS_ITEM(item));
+ g_return_if_fail(x != NULL);
+ g_return_if_fail(y != NULL);*/
+
+ double off_x;
+ double off_y;
+ ganv_item_i2w_offset(item, &off_x, &off_y);
+
+ *x += off_x;
+ *y += off_y;
+}
+
+void
+ganv_item_i2w_pair(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+ double off_x;
+ double off_y;
+ ganv_item_i2w_offset(item, &off_x, &off_y);
+
+ *x1 += off_x;
+ *y1 += off_y;
+ *x2 += off_x;
+ *y2 += off_y;
+}
+
+/**
+ * ganv_item_w2i:
+ * @item: A canvas item.
+ * @x: X coordinate to convert (input/output value).
+ * @y: Y coordinate to convert (input/output value).
+ *
+ * Converts a coordinate pair from world coordinates to item-relative
+ * coordinates.
+ **/
+void
+ganv_item_w2i(GanvItem* item, double* x, double* y)
+{
+ double off_x;
+ double off_y;
+ ganv_item_i2w_offset(item, &off_x, &off_y);
+
+ *x -= off_x;
+ *y -= off_y;
+}
+
+/**
+ * ganv_item_grab_focus:
+ * @item: A canvas item.
+ *
+ * Makes the specified item take the keyboard focus, so all keyboard events will
+ * be sent to it. If the canvas widget itself did not have the focus, it grabs
+ * it as well.
+ **/
+void
+ganv_item_grab_focus(GanvItem* item)
+{
+ GanvItem* focused_item;
+ GdkEvent ev;
+
+ g_return_if_fail(GANV_IS_ITEM(item));
+ g_return_if_fail(GTK_WIDGET_CAN_FOCUS(GTK_WIDGET(item->canvas)));
+
+ focused_item = item->canvas->focused_item;
+
+ if (focused_item) {
+ ev.focus_change.type = GDK_FOCUS_CHANGE;
+ ev.focus_change.window = GTK_LAYOUT(item->canvas)->bin_window;
+ ev.focus_change.send_event = FALSE;
+ ev.focus_change.in = FALSE;
+
+ ganv_canvas_base_emit_event(item->canvas, &ev);
+ }
+
+ item->canvas->focused_item = item;
+ gtk_widget_grab_focus(GTK_WIDGET(item->canvas));
+
+ if (focused_item) {
+ ev.focus_change.type = GDK_FOCUS_CHANGE;
+ ev.focus_change.window = GTK_LAYOUT(item->canvas)->bin_window;
+ ev.focus_change.send_event = FALSE;
+ ev.focus_change.in = TRUE;
+
+ ganv_canvas_base_emit_event(item->canvas, &ev);
+ }
+}
+
+void
+ganv_item_emit_event(GanvItem* item, GdkEvent* event, gint* finished)
+{
+ g_signal_emit(item, item_signals[ITEM_EVENT], 0, event, finished);
+}
+
+static void
+ganv_item_default_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+ *x1 = *y1 = *x2 = *y2 = 0.0;
+}
+
+/**
+ * ganv_item_get_bounds:
+ * @item: A canvas item.
+ * @x1: Leftmost edge of the bounding box (return value).
+ * @y1: Upper edge of the bounding box (return value).
+ * @x2: Rightmost edge of the bounding box (return value).
+ * @y2: Lower edge of the bounding box (return value).
+ *
+ * Queries the bounding box of a canvas item. The bounds are returned in the
+ * coordinate system of the item's parent.
+ **/
+void
+ganv_item_get_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+ GANV_ITEM_GET_CLASS(item)->bounds(item, x1, y1, x2, y2);
+}
+
+/**
+ * ganv_item_request_update:
+ * @item: A canvas item.
+ *
+ * To be used only by item implementations. Requests that the canvas queue an
+ * update for the specified item.
+ **/
+void
+ganv_item_request_update(GanvItem* item)
+{
+ /* Note: At some point, if this short-circuit was enabled, the canvas stopped
+ updating items entirely when connected modules are removed. */
+ if (item->object.flags & GANV_ITEM_NEED_UPDATE) {
+ return;
+ }
+
+ if (!item->canvas) {
+ /* Item is being / has been destroyed, ignore */
+ return;
+ }
+
+ item->object.flags |= GANV_ITEM_NEED_UPDATE;
+
+ if (item->parent != NULL) {
+ /* Recurse up the tree */
+ ganv_item_request_update(item->parent);
+ } else {
+ /* Have reached the top of the tree, make sure the update call gets scheduled. */
+ ganv_canvas_base_request_update(item->canvas);
+ }
+}
+
+static gboolean
+boolean_handled_accumulator(GSignalInvocationHint* ihint,
+ GValue* return_accu,
+ const GValue* handler_return,
+ gpointer dummy)
+{
+ gboolean continue_emission;
+ gboolean signal_handled;
+
+ signal_handled = g_value_get_boolean(handler_return);
+ g_value_set_boolean(return_accu, signal_handled);
+ continue_emission = !signal_handled;
+
+ return continue_emission;
+}
+
+/* Class initialization function for GanvItemClass */
+static void
+ganv_item_class_init(GanvItemClass* klass)
+{
+ GObjectClass* gobject_class;
+
+ gobject_class = (GObjectClass*)klass;
+
+ item_parent_class = (GtkObjectClass*)g_type_class_peek_parent(klass);
+
+ gobject_class->set_property = ganv_item_set_property;
+ gobject_class->get_property = ganv_item_get_property;
+
+ g_object_class_install_property
+ (gobject_class, ITEM_PROP_PARENT,
+ g_param_spec_object("parent", NULL, NULL,
+ GANV_TYPE_ITEM,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+ g_object_class_install_property
+ (gobject_class, ITEM_PROP_X,
+ g_param_spec_double("x",
+ _("X"),
+ _("X"),
+ -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+ g_object_class_install_property
+ (gobject_class, ITEM_PROP_Y,
+ g_param_spec_double("y",
+ _("Y"),
+ _("Y"),
+ -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+ g_object_class_install_property
+ (gobject_class, ITEM_PROP_MANAGED,
+ g_param_spec_boolean("managed",
+ _("Managed"),
+ _("Whether the item is managed by its parent"),
+ 0,
+ (G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+ item_signals[ITEM_EVENT]
+ = g_signal_new("event",
+ G_TYPE_FROM_CLASS(klass),
+ G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET(GanvItemClass, event),
+ boolean_handled_accumulator, NULL,
+ ganv_marshal_BOOLEAN__BOXED,
+ G_TYPE_BOOLEAN, 1,
+ GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
+
+ gobject_class->dispose = ganv_item_dispose;
+
+ klass->realize = ganv_item_realize;
+ klass->unrealize = ganv_item_unrealize;
+ klass->map = ganv_item_map;
+ klass->unmap = ganv_item_unmap;
+ klass->update = ganv_item_update;
+ klass->point = ganv_item_point;
+ klass->bounds = ganv_item_default_bounds;
+}