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listview: Add gtk_list_view_get_position_at_y()

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This commit is contained in:
Benjamin Otte
2019-10-16 21:31:00 +02:00
parent 7f4ab1db86
commit 07d964ece6
1 changed files with 33 additions and 9 deletions
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42
gtk/gtklistview.c
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@@ -204,6 +204,37 @@ gtk_list_view_get_row_at_y (GtkListView *self,
return row;
}
static int
gtk_list_view_get_position_at_y (GtkListView *self,
int y,
int *offset,
int *height)
{
ListRow *row;
guint pos;
int remaining;
row = gtk_list_view_get_row_at_y (self, y, &remaining);
if (row == NULL)
{
pos = GTK_INVALID_LIST_POSITION;
if (offset)
*offset = 0;
if (height)
*height = 0;
return GTK_INVALID_LIST_POSITION;
}
pos = gtk_list_item_manager_get_item_position (self->item_manager, row);
g_assert (remaining < row->height * row->parent.n_items);
pos += remaining / row->height;
if (offset)
*offset = remaining % row->height;
if (height)
*height = row->height;
return pos;
}
static int
list_row_get_y (GtkListView *self,
ListRow *row)
@@ -279,18 +310,11 @@ gtk_list_view_adjustment_value_changed_cb (GtkAdjustment *adjustment,
{
if (adjustment == self->adjustment[self->orientation])
{
ListRow *row;
guint pos;
int dy;
row = gtk_list_view_get_row_at_y (self, gtk_adjustment_get_value (adjustment), &dy);
if (row)
{
pos = gtk_list_item_manager_get_item_position (self->item_manager, row) + dy / row->height;
}
else
pos = 0;
pos = gtk_list_view_get_position_at_y (self, gtk_adjustment_get_value (adjustment), &dy, NULL);
g_return_if_fail (pos != GTK_INVALID_LIST_POSITION);
gtk_list_view_set_anchor (self, pos, 0);
}