[gnome-applets/wip/segeiger/type-changed] task-list: Only show windows from list's monitor

[Sebastian Geiger <segeiger src gnome org>]

commit fe719c285a3aea5c6c0b1f9265e299d4c199088f
Author: Sebastian Geiger <sbastig gmx net>
Date:   Thu Jan 21 14:51:00 2016 +0100

    task-list: Only show windows from list's monitor
    
     * This patch makes a given tasklist ignore windows that
       are not on the same monitor as the tasklist, if there is more than one
       task list added to gnome-panel.

 windowpicker/src/task-list.c |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)
---
diff --git a/windowpicker/src/task-list.c b/windowpicker/src/task-list.c
index f9229b3..076097a 100644
--- a/windowpicker/src/task-list.c
+++ b/windowpicker/src/task-list.c
@@ -29,6 +29,8 @@ struct _TaskListPrivate {
     WpApplet *windowPickerApplet;
 };
 
+static GSList *task_lists;
+
 G_DEFINE_TYPE_WITH_PRIVATE (TaskList, task_list, GTK_TYPE_BOX);
 
 static void on_task_item_closed (
@@ -45,6 +47,35 @@ static void on_task_item_closed (
 static void create_task_item (TaskList   *taskList,
                               WnckWindow *window)
 {
+    GdkScreen *gdk_screen;
+    GdkWindow *gdk_window;
+    gint list_monitor, window_monitor;
+    gint x, y, w, h;
+
+    if (g_slist_length (task_lists) > 1) {
+        g_message ("[task_list] Number of task_lists: %d",
+                   g_slist_length (task_lists));
+        // we have more than one tasklist running, so only show items
+        // of the current monitor on this task_list
+        gdk_window = gtk_widget_get_window (GTK_WIDGET (taskList));
+        gdk_screen = gtk_widget_get_screen (GTK_WIDGET (taskList));
+        list_monitor = gdk_screen_get_monitor_at_window (gdk_screen,
+                                                         gdk_window);
+
+        g_message ("[task_list] list_monitor=%d", list_monitor);
+
+        wnck_window_get_geometry (window, &x, &y, &w, &h);
+        /* Don't include the window if its center point is not on the same monitor */
+
+        window_monitor = gdk_screen_get_monitor_at_point (gdk_screen,
+                                                          x + w / 2,
+                                                          y + h / 2);
+
+        g_message ("[task_list] window_monitor=%d", window_monitor);
+        if (list_monitor != window_monitor)
+            return;
+    }
+
     GtkWidget *item = task_item_new (taskList->priv->windowPickerApplet,
                                      window);
 
@@ -121,6 +152,8 @@ task_list_dispose (GObject *object)
 static void
 task_list_finalize (GObject *object)
 {
+    task_lists = g_slist_remove (task_lists, object);
+
     G_OBJECT_CLASS (task_list_parent_class)->finalize (object);
 }
 
@@ -159,6 +192,8 @@ GtkWidget *task_list_new (WpApplet *windowPickerApplet) {
                                        NULL
     );
 
+    task_lists = g_slist_append (task_lists, taskList);
+
     taskList->priv->windowPickerApplet = windowPickerApplet;
 
     g_signal_connect(PANEL_APPLET(windowPickerApplet), "change-orient",