Move anchored menu placement strategy to Gtkmm2ext utils

So that it can be used by others.

1 files changed, 1 insertions, 98 deletions

diff --git a/gtk2_ardour/ardour_dropdown.cc b/gtk2_ardour/ardour_dropdown.cc
index dd1b77c6db..741db8c2ce 100644
--- a/gtk2_ardour/ardour_dropdown.cc
+++ b/gtk2_ardour/ardour_dropdown.cc
@@ -69,104 +69,7 @@ ArdourDropdown::menu_size_request(Requisition *req) {
 
 void
 ArdourDropdown::position_menu(int& x, int& y, bool& push_in) {
-	using namespace Menu_Helpers;
-
-	 /* TODO: lacks support for rotated dropdown buttons */
-
-	if (!has_screen () || !get_has_window ()) {
-		return;
-	}
-
-	Rectangle monitor;
-	{
-		const int monitor_num = get_screen ()->get_monitor_at_window (get_window ());
-		get_screen ()->get_monitor_geometry ((monitor_num < 0) ? 0 : monitor_num,
-		                                     monitor);
-	}
-
-	const Requisition menu_req = _menu.size_request();
-	const Rectangle allocation = get_allocation();
-
-	/* The x and y position are handled separately.
-	 *
-	 * For the x position if the direction is LTR (or RTL), then we try in order:
-	 *  a) align the left (right) of the menu with the left (right) of the button
-	 *     if there's enough room until the right (left) border of the screen;
-	 *  b) align the right (left) of the menu with the right (left) of the button
-	 *     if there's enough room until the left (right) border of the screen;
-	 *  c) align the right (left) border of the menu with the right (left) border
-	 *     of the screen if there's enough space;
-	 *  d) align the left (right) border of the menu with the left (right) border
-	 *     of the screen, with the rightmost (leftmost) part of the menu that
-	 *     overflows the screen.
-	 *     XXX We always align left regardless of the direction because if x is
-	 *     left of the current monitor, the menu popup code after us notices it
-	 *     and enforces that the menu stays in the monitor that's at the left...*/
-
-	get_window ()->get_origin (x, y);
-
-	if (get_direction() == TEXT_DIR_RTL) {
-		if (monitor.get_x() <= x + allocation.get_width() - menu_req.width) {
-			/* a) align menu right and button right */
-			x += allocation.get_width() - menu_req.width;
-		} else if (x + menu_req.width <= monitor.get_x() + monitor.get_width()) {
-			/* b) align menu left and button left: nothing to do*/
-		} else if (menu_req.width > monitor.get_width()) {
-			/* c) align menu left and screen left, guaranteed to fit */
-			x = monitor.get_x();
-		} else {
-			/* d) XXX align left or the menu might change monitors */
-			x = monitor.get_x();
-		}
-	} else { /* LTR */
-		if (x + menu_req.width <= monitor.get_x() + monitor.get_width()) {
-			/* a) align menu left and button left: nothing to do*/
-		} else if (monitor.get_x() <= x + allocation.get_width() - menu_req.width) {
-			/* b) align menu right and button right */
-			x += allocation.get_width() - menu_req.width;
-		} else if (menu_req.width > monitor.get_width()) {
-			/* c) align menu right and screen right, guaranteed to fit */
-			x = monitor.get_x() + monitor.get_width() - menu_req.width;
-		} else {
-			/* d) align left */
-			x = monitor.get_x();
-		}
-	}
-
-	/* For the y position, try in order:
-	 *  a) if there is a menu item with the same text as the button, align it
-	 *     with the button, unless that makes the menu overflow the monitor.
-	 *  b) align the top of the menu with the bottom of the button if there is
-	 *     enough room below the button;
-	 *  c) align the bottom of the menu with the top of the button if there is
-	 *     enough room above the button;
-	 *  d) align the bottom of the menu with the bottom of the monitor if there
-	 *     is enough room, but avoid moving the menu to another monitor */
-
-	const MenuList& items = _menu.items ();
-	const std::string button_text = get_text();
-	int offset = 0;
-
-	MenuList::const_iterator i = items.begin();
-	for ( ; i != items.end(); ++i) {
-		if (button_text == ((std::string) i->get_label())) {
-			break;
-		}
-		offset += i->size_request().height;
-	}
-	if (i != items.end() &&
-	    y - offset >= monitor.get_y() &&
-	    y - offset + menu_req.height <= monitor.get_y() + monitor.get_height()) {
-		y -= offset;
-	} else if (y + allocation.get_height() + menu_req.height <= monitor.get_y() + monitor.get_height()) {
-		y += allocation.get_height(); /* a) */
-	} else if ((y - menu_req.height) >= monitor.get_y()) {
-		y -= menu_req.height; /* b) */
-	} else {
-		y = monitor.get_y() + max(0, monitor.get_height() - menu_req.height);
-	}
-
-	push_in = false;
+    Gtkmm2ext::position_menu_anchored (&_menu, this, get_text(), x, y, push_in);
 }
 
 bool