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Move anchored menu placement strategy to Gtkmm2ext utils

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So that it can be used by others.
This commit is contained in:
Julien "_FrnchFrgg_" RIVAUD 2016-08-08 15:35:19 +02:00
parent 448902f870
commit a51cd8689f
3 changed files with 115 additions and 98 deletions
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108
libs/gtkmm2ext/utils.cc
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@ -31,6 +31,7 @@
#include <gtkmm/label.h>
#include <gtkmm/comboboxtext.h>
#include <gtkmm/tooltip.h>
#include <gtkmm/menuitem.h>
#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/persistent_tooltip.h"
@ -308,6 +309,113 @@ Gtkmm2ext::pixbuf_from_string(const string& name, const Pango::FontDescription&
return buf;
}
void
Gtkmm2ext::position_menu_anchored (const Gtk::Menu* const menu,
Gtk::Widget* const anchor,
const std::string& selected,
int& x, int& y, bool& push_in) {
using namespace Gdk;
using namespace Gtk;
using namespace Gtk::Menu_Helpers;
/* TODO: lacks support for rotated dropdown buttons */
if (!anchor->has_screen () || !anchor->get_has_window ()) {
return;
}
Rectangle monitor;
{
const int monitor_num = anchor->get_screen ()->get_monitor_at_window (
anchor->get_window ());
anchor->get_screen ()->get_monitor_geometry (
(monitor_num < 0) ? 0 : monitor_num, monitor);
}
const Requisition menu_req = menu->size_request();
const Rectangle allocation = anchor->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...*/
anchor->get_window ()->get_origin (x, y);
if (anchor->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 ();
int offset = 0;
MenuList::const_iterator i = items.begin();
for ( ; i != items.end(); ++i) {
if (selected == ((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;
}
void
Gtkmm2ext::set_popdown_strings (Gtk::ComboBoxText& cr, const vector<string>& strings)
{