tdf#131120 use a replacement for GtkComboBox

the problems with GtkComboBox we have are:

1) https://gitlab.gnome.org/GNOME/gtk/issues/1910 has_entry long menus take
forever to appear (tdf#125388)

on measuring each row, the GtkComboBox GtkTreeMenu will call its
area_apply_attributes_cb function on the row, but that calls
gtk_tree_menu_get_path_item which then loops through each child of the menu
looking for the widget of the row, so performance drops to useless.

All area_apply_attributes_cb does it set menu item sensitivity, so block it
from running with fragile hackery which assumes that the unwanted callback is
the only one with a

2) https://gitlab.gnome.org/GNOME/gtk/issues/94
when a super tall combobox menu is activated, and the selected entry is
sufficiently far down the list, then the menu doesn't appear under wayland

3) https://gitlab.gnome.org/GNOME/gtk/issues/310
no typeahead support

4) we want to be able to control the width of the button, but have a drop down menu which
is not limited to the width of the button

5) https://bugs.documentfoundation.org/show_bug.cgi?id=131120
super tall menu doesn't appear under X sometimes

In general we often pack a lot into the comboboxes and the default ones don't
like that.

Overlay scrolling is turned off for the GtkTreeView replacement because
otherwise there are null-derefs in gtk on indicator->scrollbar on repeated
reopenings

Change-Id: I1b6164020996377341b5992d593a027b76021f65
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/91990
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 103 insertions, 0 deletions

diff --git a/vcl/uiconfig/ui/combobox.ui b/vcl/uiconfig/ui/combobox.ui
new file mode 100644
index 000000000000..167ae1a7f5ac
--- /dev/null
+++ b/vcl/uiconfig/ui/combobox.ui
@@ -0,0 +1,103 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.22.2 -->
+<interface domain="vcl">
+  <requires lib="gtk+" version="3.18"/>
+  <object class="GtkBox" id="box">
+    <property name="visible">True</property>
+    <property name="can_focus">False</property>
+    <property name="no_show_all">True</property>
+    <child>
+      <object class="GtkEntry" id="entry">
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="no_show_all">True</property>
+        <property name="activates_default">True</property>
+        <style>
+          <class name="combo"/>
+        </style>
+      </object>
+      <packing>
+        <property name="expand">True</property>
+        <property name="fill">True</property>
+        <property name="position">1</property>
+      </packing>
+    </child>
+    <child>
+      <object class="GtkToggleButton" id="button">
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="receives_default">True</property>
+        <property name="no_show_all">True</property>
+        <property name="always_show_image">True</property>
+        <property name="draw_indicator">True</property>
+        <child>
+          <object class="GtkBox">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <child>
+              <object class="GtkImage" id="arrow">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="icon_name">pan-down-symbolic</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">False</property>
+                <property name="pack_type">end</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+          </object>
+        </child>
+        <style>
+          <class name="combo"/>
+        </style>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="pack_type">end</property>
+        <property name="position">2</property>
+      </packing>
+    </child>
+    <style>
+      <class name="linked"/>
+    </style>
+  </object>
+  <object class="GtkWindow" id="popup">
+    <property name="name">gtk-combobox-popup-window</property>
+    <property name="can_focus">False</property>
+    <property name="type">popup</property>
+    <property name="resizable">False</property>
+    <property name="modal">True</property>
+    <property name="type_hint">combo</property>
+    <child type="titlebar">
+      <placeholder/>
+    </child>
+    <child>
+      <object class="GtkScrolledWindow" id="scrolledwindow">
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="hscrollbar_policy">never</property>
+        <property name="shadow_type">in</property>
+        <property name="overlay_scrolling">False</property>
+        <child>
+          <object class="GtkTreeView" id="treeview">
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="headers_visible">False</property>
+            <property name="headers_clickable">False</property>
+            <property name="enable_search">False</property>
+            <property name="search_column">0</property>
+            <property name="hover_selection">True</property>
+            <property name="show_expanders">False</property>
+            <property name="activate_on_single_click">True</property>
+            <child internal-child="selection">
+              <object class="GtkTreeSelection"/>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>