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-rw-r--r--widgets/misc/e-canvas.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/widgets/misc/e-canvas.c b/widgets/misc/e-canvas.c
index fea3746ce1..f06aa6e33b 100644
--- a/widgets/misc/e-canvas.c
+++ b/widgets/misc/e-canvas.c
@@ -30,6 +30,8 @@ static void e_canvas_realize (GtkWidget *widget);
static void e_canvas_unrealize (GtkWidget *widget);
static gint e_canvas_key (GtkWidget *widget,
GdkEventKey *event);
+static gint e_canvas_button (GtkWidget *widget,
+ GdkEventButton *event);
static gint e_canvas_visibility (GtkWidget *widget,
GdkEventVisibility *event,
@@ -93,6 +95,8 @@ e_canvas_class_init (ECanvasClass *klass)
widget_class->key_press_event = e_canvas_key;
widget_class->key_release_event = e_canvas_key;
+ widget_class->button_press_event = e_canvas_button;
+ widget_class->button_release_event = e_canvas_button;
widget_class->focus_in_event = e_canvas_focus_in;
widget_class->focus_out_event = e_canvas_focus_out;
widget_class->realize = e_canvas_realize;
@@ -301,6 +305,257 @@ e_canvas_key (GtkWidget *widget, GdkEventKey *event)
return emit_event (canvas, &full_event);
}
+
+/* This routine invokes the point method of the item. The argument x, y should
+ * be in the parent's item-relative coordinate system. This routine applies the
+ * inverse of the item's transform, maintaining the affine invariant.
+ */
+#define HACKISH_AFFINE
+
+static double
+gnome_canvas_item_invoke_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
+ GnomeCanvasItem **actual_item)
+{
+#ifdef HACKISH_AFFINE
+ double i2w[6], w2c[6], i2c[6], c2i[6];
+ ArtPoint c, i;
+#endif
+
+#ifdef HACKISH_AFFINE
+ gnome_canvas_item_i2w_affine (item, i2w);
+ gnome_canvas_w2c_affine (item->canvas, w2c);
+ art_affine_multiply (i2c, i2w, w2c);
+ art_affine_invert (c2i, i2c);
+ c.x = cx;
+ c.y = cy;
+ art_affine_point (&i, &c, c2i);
+ x = i.x;
+ y = i.y;
+#endif
+
+ return (* GNOME_CANVAS_ITEM_CLASS (item->object.klass)->point) (
+ item, x, y, cx, cy, actual_item);
+}
+
+/* Re-picks the current item in the canvas, based on the event's coordinates.
+ * Also emits enter/leave events for items as appropriate.
+ */
+#define DISPLAY_X1(canvas) (GNOME_CANVAS (canvas)->layout.xoffset)
+#define DISPLAY_Y1(canvas) (GNOME_CANVAS (canvas)->layout.yoffset)
+static int
+pick_current_item (GnomeCanvas *canvas, GdkEvent *event)
+{
+ int button_down;
+ double x, y;
+ int cx, cy;
+ int retval;
+
+ retval = FALSE;
+
+ /* If a button is down, we'll perform enter and leave events on the
+ * current item, but not enter on any other item. This is more or less
+ * like X pointer grabbing for canvas items.
+ */
+ button_down = canvas->state & (GDK_BUTTON1_MASK
+ | GDK_BUTTON2_MASK
+ | GDK_BUTTON3_MASK
+ | GDK_BUTTON4_MASK
+ | GDK_BUTTON5_MASK);
+ if (!button_down)
+ canvas->left_grabbed_item = FALSE;
+
+ /* Save the event in the canvas. This is used to synthesize enter and
+ * leave events in case the current item changes. It is also used to
+ * re-pick the current item if the current one gets deleted. Also,
+ * synthesize an enter event.
+ */
+ if (event != &canvas->pick_event) {
+ if ((event->type == GDK_MOTION_NOTIFY) || (event->type == GDK_BUTTON_RELEASE)) {
+ /* these fields have the same offsets in both types of events */
+
+ canvas->pick_event.crossing.type = GDK_ENTER_NOTIFY;
+ canvas->pick_event.crossing.window = event->motion.window;
+ canvas->pick_event.crossing.send_event = event->motion.send_event;
+ canvas->pick_event.crossing.subwindow = NULL;
+ canvas->pick_event.crossing.x = event->motion.x;
+ canvas->pick_event.crossing.y = event->motion.y;
+ canvas->pick_event.crossing.mode = GDK_CROSSING_NORMAL;
+ canvas->pick_event.crossing.detail = GDK_NOTIFY_NONLINEAR;
+ canvas->pick_event.crossing.focus = FALSE;
+ canvas->pick_event.crossing.state = event->motion.state;
+
+ /* these fields don't have the same offsets in both types of events */
+
+ if (event->type == GDK_MOTION_NOTIFY) {
+ canvas->pick_event.crossing.x_root = event->motion.x_root;
+ canvas->pick_event.crossing.y_root = event->motion.y_root;
+ } else {
+ canvas->pick_event.crossing.x_root = event->button.x_root;
+ canvas->pick_event.crossing.y_root = event->button.y_root;
+ }
+ } else
+ canvas->pick_event = *event;
+ }
+
+ /* Don't do anything else if this is a recursive call */
+
+ if (canvas->in_repick)
+ return retval;
+
+ /* LeaveNotify means that there is no current item, so we don't look for one */
+
+ if (canvas->pick_event.type != GDK_LEAVE_NOTIFY) {
+ /* these fields don't have the same offsets in both types of events */
+
+ if (canvas->pick_event.type == GDK_ENTER_NOTIFY) {
+ x = canvas->pick_event.crossing.x + DISPLAY_X1 (canvas) - canvas->zoom_xofs;
+ y = canvas->pick_event.crossing.y + DISPLAY_Y1 (canvas) - canvas->zoom_yofs;
+ } else {
+ x = canvas->pick_event.motion.x + DISPLAY_X1 (canvas) - canvas->zoom_xofs;
+ y = canvas->pick_event.motion.y + DISPLAY_Y1 (canvas) - canvas->zoom_yofs;
+ }
+
+ /* canvas pixel coords */
+
+ cx = (int) (x + 0.5);
+ cy = (int) (y + 0.5);
+
+ /* world coords */
+
+ x = canvas->scroll_x1 + x / canvas->pixels_per_unit;
+ y = canvas->scroll_y1 + y / canvas->pixels_per_unit;
+
+ /* find the closest item */
+
+ if (canvas->root->object.flags & GNOME_CANVAS_ITEM_VISIBLE)
+ gnome_canvas_item_invoke_point (canvas->root, x, y, cx, cy,
+ &canvas->new_current_item);
+ else
+ canvas->new_current_item = NULL;
+ } else
+ canvas->new_current_item = NULL;
+
+ if ((canvas->new_current_item == canvas->current_item) && !canvas->left_grabbed_item)
+ return retval; /* current item did not change */
+
+ /* Synthesize events for old and new current items */
+
+ if ((canvas->new_current_item != canvas->current_item)
+ && (canvas->current_item != NULL)
+ && !canvas->left_grabbed_item) {
+ GdkEvent new_event;
+ GnomeCanvasItem *item;
+
+ item = canvas->current_item;
+
+ new_event = canvas->pick_event;
+ new_event.type = GDK_LEAVE_NOTIFY;
+
+ new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
+ new_event.crossing.subwindow = NULL;
+ canvas->in_repick = TRUE;
+ retval = 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 */
+
+ if ((canvas->new_current_item != canvas->current_item) && button_down) {
+ canvas->left_grabbed_item = TRUE;
+ return retval;
+ }
+
+ /* Handle the rest of cases */
+
+ canvas->left_grabbed_item = FALSE;
+ canvas->current_item = canvas->new_current_item;
+
+ if (canvas->current_item != NULL) {
+ GdkEvent new_event;
+
+ new_event = canvas->pick_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);
+ }
+
+ return retval;
+}
+
+/* Button event handler for the canvas */
+static gint
+e_canvas_button (GtkWidget *widget, GdkEventButton *event)
+{
+ GnomeCanvas *canvas;
+ int mask;
+ int retval;
+
+ g_return_val_if_fail (widget != NULL, FALSE);
+ g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
+ g_return_val_if_fail (event != NULL, FALSE);
+
+ retval = FALSE;
+
+ canvas = GNOME_CANVAS (widget);
+
+ /* dispatch normally regardless of the event's window if an item has
+ has a pointer grab in effect */
+ if (!canvas->grabbed_item && event->window != canvas->layout.bin_window)
+ return retval;
+
+ switch (event->button) {
+ case 1:
+ mask = GDK_BUTTON1_MASK;
+ break;
+ case 2:
+ mask = GDK_BUTTON2_MASK;
+ break;
+ case 3:
+ mask = GDK_BUTTON3_MASK;
+ break;
+ case 4:
+ mask = GDK_BUTTON4_MASK;
+ break;
+ case 5:
+ mask = GDK_BUTTON5_MASK;
+ break;
+ default:
+ mask = 0;
+ }
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ case GDK_2BUTTON_PRESS:
+ case GDK_3BUTTON_PRESS:
+ /* Pick the current item as if the button were not pressed, and
+ * then process the event.
+ */
+ canvas->state = event->state;
+ pick_current_item (canvas, (GdkEvent *) event);
+ canvas->state ^= mask;
+ retval = emit_event (canvas, (GdkEvent *) event);
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ /* Process the event as if the button were pressed, then repick
+ * after the button has been released
+ */
+ canvas->state = event->state;
+ retval = emit_event (canvas, (GdkEvent *) event);
+ event->state ^= mask;
+ canvas->state = event->state;
+ pick_current_item (canvas, (GdkEvent *) event);
+ event->state ^= mask;
+ break;
+
+ default:
+ g_assert_not_reached ();
+ }
+
+ return retval;
+}
+
/* Key event handler for the canvas */
static gint
e_canvas_visibility (GtkWidget *widget, GdkEventVisibility *event, ECanvas *canvas)