Add window-menu plugin

This plugin handles the xdg.show_window_menu signal. It launches a menu
and positions it on screen. Additionally, it undecorates the menu, so that
set_decorated(false) works for gtk clients. (Currently gtk3 has a bug such
that disabling the decorations tells the compositor to decorate it.)

metadata/meson.build

@@ -9,5 +9,6 @@ install_data('join-views.xml', install_dir: wayfire.get_variable(pkgconfig: 'met
 install_data('keycolor.xml', install_dir: wayfire.get_variable(pkgconfig: 'metadatadir'))
 install_data('mag.xml', install_dir: wayfire.get_variable(pkgconfig: 'metadatadir'))
 install_data('showrepaint.xml', install_dir: wayfire.get_variable(pkgconfig: 'metadatadir'))
+install_data('window-menu.xml', install_dir: wayfire.get_variable(pkgconfig: 'metadatadir'))
 install_data('water.xml', install_dir: wayfire.get_variable(pkgconfig: 'metadatadir'))
 install_data('workspace-names.xml', install_dir: wayfire.get_variable(pkgconfig: 'metadatadir'))

metadata/window-menu.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<wayfire>
+	<plugin name="window-menu">
+	<_short>Window Menu</_short>
+	<category>Window Management</category>
+	<option name="command" type="string">
+		<_short>Command</_short>
+		<default>nwgcc --name=nwgcc</default>
+	</option>
+	<option name="app_id" type="string">
+		<_short>Application Identifier Match</_short>
+		<default>nwgcc</default>
+	</option>
+	</plugin>
+</wayfire>

src/meson.build

@@ -46,6 +46,10 @@ water = shared_module('water', 'water.cpp',
     dependencies: [wayfire, wlroots, wfconfig],
     install: true, install_dir: join_paths(get_option('libdir'), 'wayfire'))
 
+window_menu = shared_module('window-menu', 'window-menu.cpp',
+    dependencies: [wayfire, wlroots, wfconfig],
+    install: true, install_dir: join_paths(get_option('libdir'), 'wayfire'))
+
 workspace_names = shared_module('workspace-names', 'workspace-names.cpp',
     dependencies: [wayfire, wlroots, wfconfig, cairo],
     install: true, install_dir: join_paths(get_option('libdir'), 'wayfire'))

src/window-menu.cpp

@@ -0,0 +1,162 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Scott Moreau
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+
+#include <wayfire/core.hpp>
+#include <wayfire/view.hpp>
+#include <wayfire/plugin.hpp>
+#include <wayfire/output.hpp>
+#include <wayfire/signal-definitions.hpp>
+#include <wayfire/workspace-manager.hpp>
+#include <wayfire/output-layout.hpp>
+
+class wayfire_window_menu : public wf::plugin_interface_t
+{
+    /* The command should be set to a client that shows a menu window. */
+    wf::option_wrapper_t<std::string> command{"window-menu/command"};
+    wf::option_wrapper_t<std::string> app_id{"window-menu/app_id"};
+    wf::point_t position_offset;
+    wayfire_view menu_view   = nullptr;
+    wayfire_view target_view = nullptr;
+
+  public:
+    void init() override
+    {
+        grab_interface->name = "window-menu";
+        grab_interface->capabilities = 0;
+
+        output->connect_signal("view-show-window-menu", &show_window_menu);
+    }
+
+    wf::signal_connection_t view_mapped{[this] (wf::signal_data_t *data)
+        {
+            auto view = get_signaled_view(data);
+            if (target_view && (view->get_app_id() == std::string(app_id)))
+            {
+                view->set_decoration(nullptr);
+
+                auto vg = target_view->get_output_geometry();
+                auto position = wf::point_t{vg.x, vg.y} + position_offset;
+
+                vg = view->get_wm_geometry();
+                auto og     = output->get_relative_geometry();
+                int padding = 20;
+                og.x     += padding;
+                og.y     += padding;
+                og.width -= padding * 2 + vg.width;
+                og.height -= padding * 2 + vg.height;
+                if ((og.width <= 0) || (og.height <= 0))
+                {
+                    return;
+                }
+
+                wlr_box box{og.x, og.y, og.width, og.height};
+                wf::pointf_t p{(float)position.x, (float)position.y};
+                p = target_view->transform_point(p);
+                wlr_box_closest_point(&box, p.x, p.y, &p.x, &p.y);
+                position.x = (int)p.x;
+                position.y = (int)p.y;
+
+                ((wf::view_mapped_signal*)data)->is_positioned = true;
+                view->move(position.x, position.y);
+
+                /* Place above other views */
+                output->workspace->add_view(view, wf::LAYER_UNMANAGED);
+
+                menu_view = view;
+            }
+        }
+    };
+
+    wf::signal_connection_t on_button{[=] (wf::signal_data_t *data)
+        {
+            auto ev = static_cast<
+                wf::input_event_signal<wlr_event_pointer_button>*>(data);
+
+            if (ev->event->state != WLR_BUTTON_PRESSED)
+            {
+                return;
+            }
+
+            auto view = wf::get_core().get_cursor_focus_view();
+            if (!menu_view || !view)
+            {
+                return;
+            }
+
+            /* Check if the client of the views match, in case it's a
+             * subsurface/menu, meaning the views won't match but
+             * the underlying client object will */
+            if (menu_view->get_client() != view->get_client())
+            {
+                menu_view->close();
+            }
+        }
+    };
+
+    wf::signal_connection_t view_unmapped{[this] (wf::signal_data_t *data)
+        {
+            auto view = get_signaled_view(data);
+            if (view && (menu_view == view))
+            {
+                menu_view = target_view = nullptr;
+                output->disconnect_signal(&view_mapped);
+                output->disconnect_signal(&view_unmapped);
+                wf::get_core().disconnect_signal(&on_button);
+            }
+        }
+    };
+
+    wf::signal_connection_t show_window_menu{[this] (wf::signal_data_t *data)
+        {
+            if (target_view || menu_view)
+            {
+                return;
+            }
+
+            position_offset =
+                ((wf::view_show_window_menu_signal*)data)->relative_position;
+            if (wf::get_core().run(std::string(command)) == -1)
+            {
+                return;
+            }
+
+            /* Showing menu for this view */
+            target_view = get_signaled_view(data);
+            output->connect_signal("view-mapped", &view_mapped);
+            output->connect_signal("view-unmapped", &view_unmapped);
+            wf::get_core().connect_signal("pointer_button", &on_button);
+        }
+    };
+
+    void fini() override
+    {
+        if (menu_view)
+        {
+            menu_view->close();
+        }
+    }
+};
+
+DECLARE_WAYFIRE_PLUGIN(wayfire_window_menu);