From 604fa96f1026fbffd4dcf21a864076d068e6f56a Mon Sep 17 00:00:00 2001
From: osch <oliver at luced de>
Date: Tue, 14 May 2019 09:40:11 +0200
Subject: Make alt+tab max columns configurable and consider window label width

---
 src/ui/tabpopup.c | 56 ++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 43 insertions(+), 13 deletions(-)

(limited to 'src/ui/tabpopup.c')

diff --git a/src/ui/tabpopup.c b/src/ui/tabpopup.c
index d7887ca8..18ee83d5 100644
--- a/src/ui/tabpopup.c
+++ b/src/ui/tabpopup.c
@@ -221,10 +221,11 @@ MetaTabPopup*
 meta_ui_tab_popup_new (const MetaTabEntry *entries,
                        int                 entry_count,
                        int                 width,
+                       gboolean            expand_for_titles,
                        gint                border)
 {
   MetaTabPopup *popup;
-  int i, left, right, top, bottom;
+  int i, left, top;
   int height;
   GtkWidget *grid;
   GtkWidget *vbox;
@@ -233,7 +234,7 @@ meta_ui_tab_popup_new (const MetaTabEntry *entries,
   int max_label_width; /* the actual max width of the labels we create */
   AtkObject *obj;
   GdkScreen *screen;
-  int screen_width, scale;
+  int scale;
 
   popup = g_new (MetaTabPopup, 1);
 
@@ -278,7 +279,6 @@ meta_ui_tab_popup_new (const MetaTabEntry *entries,
   popup->border = border;
 
   scale = gtk_widget_get_scale_factor (GTK_WIDGET (popup->window));
-  screen_width = WidthOfScreen (gdk_x11_screen_get_xscreen (screen));
   for (i = 0; i < entry_count; ++i)
     {
       TabEntry* new_entry = tab_entry_new (&entries[i], border & BORDER_OUTLINE_WINDOW, scale);
@@ -325,13 +325,14 @@ meta_ui_tab_popup_new (const MetaTabEntry *entries,
 
   max_label_width = 0;
   top = 0;
-  bottom = 1;
+  left = 0;
   tmp = popup->entries;
 
+  gtk_widget_show(popup->label); /* for gtk_widget_get_preferred_size() */
+  
   while (tmp && top < height)
     {
       left = 0;
-      right = 1;
 
       while (tmp && left < width)
         {
@@ -383,11 +384,9 @@ meta_ui_tab_popup_new (const MetaTabEntry *entries,
           tmp = tmp->next;
 
           ++left;
-          ++right;
         }
 
       ++top;
-      ++bottom;
     }
 
   /* remove all the temporary text */
@@ -395,16 +394,47 @@ meta_ui_tab_popup_new (const MetaTabEntry *entries,
   /* Make it so that we ellipsize if the text is too long */
   gtk_label_set_ellipsize (GTK_LABEL (popup->label), PANGO_ELLIPSIZE_END);
 
-  /* Limit the window size to no bigger than screen_width/4 */
-  if (max_label_width>(screen_width/4))
+  int default_window_width = 0; /* 0 == small as possible, truncate label */
+
+  if (expand_for_titles && top <= 1 && left < width)
     {
-      max_label_width = screen_width/4;
+      /* only one row partially filled with columns and additional_columns given
+         => calculate default_window_width to fit max_label_width if possible */
+      
+      GtkWidget **dummies = g_try_malloc(sizeof(GtkWidget*) * (width - left));
+      if (dummies)
+        {
+          int j;
+          for (j = 0; j < width - left; ++j) 
+            {
+              GtkWidget *dummy = gtk_label_new ("");
+              dummies[j] = dummy;
+              gtk_grid_attach (GTK_GRID (grid), dummy, left + j, top, 1, 1);
+            }
+            
+          gtk_grid_set_column_homogeneous(GTK_GRID(grid), TRUE);
+          gtk_widget_set_halign (grid, GTK_ALIGN_CENTER);
+          gtk_widget_show_all(grid); /* for gtk_widget_get_preferred_size */
+    
+          GtkRequisition req;
+          gtk_widget_get_preferred_size (grid, &req, NULL);
+          default_window_width = req.width;
+    
+          for (j = 0; j < width - left; ++j) 
+            {
+              gtk_container_remove(GTK_CONTAINER(grid), dummies[j]);
+            }
+          g_free(dummies);
+          /* Limit the window size to no bigger than max_label_width */
+          if (max_label_width < default_window_width)
+            {
+              default_window_width = max_label_width;
+            }
+        }
     }
 
-  max_label_width += 20; /* add random padding */
-
   gtk_window_set_default_size (GTK_WINDOW (popup->window),
-                               max_label_width,
+                               default_window_width,
                                -1);
 
   return popup;
-- 
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