[gnome-calculator] math-display: Inhibit the OSK

[Robert Roth <robertroth src gnome org>]

commit 5b9f97fe31de2ac11954fd048fafacd20ea3db85
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Mon Jan 13 08:35:34 2020 +0100

    math-display: Inhibit the OSK
    
    This drop the OSK in all modes but the keyboard mode, as it duplicates
    the in-window buttons, and hinders the usability on touchscreens. This
    also prevents adding emojis and drops spellchecking as they aren't
    relevant to a calculator.

 src/math-display.vala | 8 ++++++++
 src/math-window.vala  | 1 +
 2 files changed, 9 insertions(+)
---
diff --git a/src/math-display.vala b/src/math-display.vala
index e19f4f39..760fd397 100644
--- a/src/math-display.vala
+++ b/src/math-display.vala
@@ -58,6 +58,8 @@ public class MathDisplay : Gtk.Box
         source_view.set_pixels_below_lines (2);
         source_view.set_justification (Gtk.Justification.LEFT);
 
+        set_enable_osk (false);
+
         source_view.set_name ("displayitem");
         source_view.set_size_request (20, 20);
         source_view.get_accessible ().set_role (Atk.Role.EDITBAR);
@@ -99,6 +101,12 @@ public class MathDisplay : Gtk.Box
         equation.notify["error-token-end"].connect ((pspec) => { error_status_changed_cb (); });
     }
 
+    public void set_enable_osk (bool enable_osk)
+    {
+        const Gtk.InputHints hints = Gtk.InputHints.NO_EMOJI | Gtk.InputHints.NO_SPELLCHECK;
+        source_view.set_input_hints (enable_osk ? hints : hints | Gtk.InputHints.INHIBIT_OSK);
+    }
+
     public void grabfocus () /* Editbar grabs focus when an instance of gnome-calculator is created */
     {
         source_view.grab_focus ();
diff --git a/src/math-window.vala b/src/math-window.vala
index 122aacbf..7e0cb0f2 100644
--- a/src/math-window.vala
+++ b/src/math-window.vala
@@ -125,6 +125,7 @@ public class MathWindow : Hdy.ApplicationWindow
             converter.show ();
         }
 
+        display.set_enable_osk (remove_buttons);
         resize (1, 1);
     }