[gtk/gtk-4-6: 4/5] treepopover: Add support for scrolling

[Matthias Clasen <matthiasc src gnome org>]

commit f8231cf1a7f46227f26afc96e9ef997dec1d6a97
Author: Mat <mail mathias is>
Date:   Sun Jul 17 22:24:51 2022 +0300

    treepopover: Add support for scrolling
    
    Add support for scrolling large tree popovers in a similar fashion to GtkPopoverMenu.
    
    Fixes #3674
    Fixes #4877

 gtk/gtktreepopover.c               | 31 +++++++++++---
 testsuite/css/nodes/combobox.nodes | 82 ++++++++++++++++++++++++++++----------
 2 files changed, 85 insertions(+), 28 deletions(-)
---
diff --git a/gtk/gtktreepopover.c b/gtk/gtktreepopover.c
index f2b8285e1c..706a0bc978 100644
--- a/gtk/gtktreepopover.c
+++ b/gtk/gtktreepopover.c
@@ -30,6 +30,8 @@
 #include "gtkgizmoprivate.h"
 #include "gtkwidgetprivate.h"
 #include "gtkbuiltiniconprivate.h"
+#include "gtkscrolledwindow.h"
+#include "gtkviewport.h"
 
 // TODO
 // positioning + sizing
@@ -226,12 +228,22 @@ gtk_tree_popover_class_init (GtkTreePopoverClass *class)
                   G_TYPE_NONE, 1, G_TYPE_STRING);
 }
 
+static GtkWidget *
+gtk_tree_popover_get_stack (GtkTreePopover *popover)
+{
+  GtkWidget *sw = gtk_popover_get_child (GTK_POPOVER (popover));
+  GtkWidget *vp = gtk_scrolled_window_get_child (GTK_SCROLLED_WINDOW (sw));
+  GtkWidget *stack = gtk_viewport_get_child (GTK_VIEWPORT (vp));
+
+  return stack;
+}
+
 static void
 gtk_tree_popover_add_submenu (GtkTreePopover *popover,
                               GtkWidget      *submenu,
                               const char     *name)
 {
-  GtkWidget *stack = gtk_popover_get_child (GTK_POPOVER (popover));
+  GtkWidget *stack = gtk_tree_popover_get_stack (popover);
   gtk_stack_add_named (GTK_STACK (stack), submenu, name);
 }
 
@@ -239,7 +251,7 @@ static GtkWidget *
 gtk_tree_popover_get_submenu (GtkTreePopover *popover,
                               const char     *name)
 {
-  GtkWidget *stack = gtk_popover_get_child (GTK_POPOVER (popover));
+  GtkWidget *stack = gtk_tree_popover_get_stack (popover);
   return gtk_stack_get_child_by_name (GTK_STACK (stack), name);
 }
 
@@ -247,20 +259,27 @@ void
 gtk_tree_popover_open_submenu (GtkTreePopover *popover,
                                const char     *name)
 {
-  GtkWidget *stack = gtk_popover_get_child (GTK_POPOVER (popover));
+  GtkWidget *stack = gtk_tree_popover_get_stack (popover);
   gtk_stack_set_visible_child_name (GTK_STACK (stack), name);
 }
 
 static void
 gtk_tree_popover_init (GtkTreePopover *popover)
 {
+  GtkWidget *sw;
   GtkWidget *stack;
 
+  sw = gtk_scrolled_window_new ();
+  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
+  gtk_scrolled_window_set_propagate_natural_width (GTK_SCROLLED_WINDOW (sw), TRUE);
+  gtk_scrolled_window_set_propagate_natural_height (GTK_SCROLLED_WINDOW (sw), TRUE);
+  gtk_popover_set_child (GTK_POPOVER (popover), sw);
+
   stack = gtk_stack_new ();
   gtk_stack_set_vhomogeneous (GTK_STACK (stack), FALSE);
   gtk_stack_set_transition_type (GTK_STACK (stack), GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT_RIGHT);
   gtk_stack_set_interpolate_size (GTK_STACK (stack), TRUE);
-  gtk_popover_set_child (GTK_POPOVER (popover), stack);
+  gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), stack);
 
   gtk_widget_add_css_class (GTK_WIDGET (popover), "menu");
 }
@@ -465,7 +484,7 @@ static GtkWidget *
 gtk_tree_popover_get_path_item (GtkTreePopover *popover,
                                 GtkTreePath    *search)
 {
-  GtkWidget *stack = gtk_popover_get_child (GTK_POPOVER (popover));
+  GtkWidget *stack = gtk_tree_popover_get_stack (popover);
   GtkWidget *item = NULL;
   GtkWidget *stackchild;
   GtkWidget *child;
@@ -779,7 +798,7 @@ rebuild_menu (GtkTreePopover *popover)
   GtkWidget *stack;
   GtkWidget *child;
 
-  stack = gtk_popover_get_child (GTK_POPOVER (popover));
+  stack = gtk_tree_popover_get_stack (popover);
   while ((child = gtk_widget_get_first_child (stack)))
     gtk_stack_remove (GTK_STACK (stack), child);
 
diff --git a/testsuite/css/nodes/combobox.nodes b/testsuite/css/nodes/combobox.nodes
index e0ac7310fc..c18ead0413 100644
--- a/testsuite/css/nodes/combobox.nodes
+++ b/testsuite/css/nodes/combobox.nodes
@@ -8,17 +8,36 @@ window.background:dir(ltr)
             arrow:dir(ltr)
       [popover.background.menu:dir(ltr)]
         contents:dir(ltr)
-          stack:dir(ltr)
-            box.vertical:dir(ltr)
-              modelbutton.flat:dir(ltr)
-                cellview:dir(ltr)
-                none.right:dir(ltr)
-              modelbutton.flat:dir(ltr)
-                cellview:dir(ltr)
-                none.right:dir(ltr)
-              modelbutton.flat:dir(ltr)
-                cellview:dir(ltr)
-                none.right:dir(ltr)
+          scrolledwindow:dir(ltr)
+            viewport:dir(ltr)
+              stack:dir(ltr)
+                box.vertical:dir(ltr)
+                  modelbutton.flat:dir(ltr)
+                    cellview:dir(ltr)
+                    none.right:dir(ltr)
+                  modelbutton.flat:dir(ltr)
+                    cellview:dir(ltr)
+                    none.right:dir(ltr)
+                  modelbutton.flat:dir(ltr)
+                    cellview:dir(ltr)
+                    none.right:dir(ltr)
+            scrollbar.bottom.horizontal:dir(ltr)
+              range.horizontal:dir(ltr)
+                trough:dir(ltr)
+                  slider:dir(ltr)
+            scrollbar.right.vertical:dir(ltr)
+              range.vertical:dir(ltr)
+                trough:dir(ltr)
+                  slider:dir(ltr)
+            overshoot.left:dir(ltr)
+            undershoot.left:dir(ltr)
+            overshoot.right:dir(ltr)
+            undershoot.right:dir(ltr)
+            overshoot.top:dir(ltr)
+            undershoot.top:dir(ltr)
+            overshoot.bottom:dir(ltr)
+            undershoot.bottom:dir(ltr)
+            junction:dir(ltr)
         arrow:dir(ltr)
     combobox:dir(ltr)
       box.horizontal.linked:dir(ltr)
@@ -31,15 +50,34 @@ window.background:dir(ltr)
             arrow:dir(ltr)
       [popover.background.menu:dir(ltr)]
         contents:dir(ltr)
-          stack:dir(ltr)
-            box.vertical:dir(ltr)
-              modelbutton.flat:dir(ltr)
-                cellview:dir(ltr)
-                none.right:dir(ltr)
-              modelbutton.flat:dir(ltr)
-                cellview:dir(ltr)
-                none.right:dir(ltr)
-              modelbutton.flat:dir(ltr)
-                cellview:dir(ltr)
-                none.right:dir(ltr)
+          scrolledwindow:dir(ltr)
+            viewport:dir(ltr)
+              stack:dir(ltr)
+                box.vertical:dir(ltr)
+                  modelbutton.flat:dir(ltr)
+                    cellview:dir(ltr)
+                    none.right:dir(ltr)
+                  modelbutton.flat:dir(ltr)
+                    cellview:dir(ltr)
+                    none.right:dir(ltr)
+                  modelbutton.flat:dir(ltr)
+                    cellview:dir(ltr)
+                    none.right:dir(ltr)
+            scrollbar.bottom.horizontal:dir(ltr)
+              range.horizontal:dir(ltr)
+                trough:dir(ltr)
+                  slider:dir(ltr)
+            scrollbar.right.vertical:dir(ltr)
+              range.vertical:dir(ltr)
+                trough:dir(ltr)
+                  slider:dir(ltr)
+            overshoot.left:dir(ltr)
+            undershoot.left:dir(ltr)
+            overshoot.right:dir(ltr)
+            undershoot.right:dir(ltr)
+            overshoot.top:dir(ltr)
+            undershoot.top:dir(ltr)
+            overshoot.bottom:dir(ltr)
+            undershoot.bottom:dir(ltr)
+            junction:dir(ltr)
         arrow:dir(ltr)