[moserial] Fix deprecated Gtk.Color. Use CSS for textview colors and font.

[Michael J. Chudobiak <mjc src gnome org>]

commit a68927e9789272815200529b31a624e0d61a9595
Author: Mictronics <github mictronics de>
Date:   Sun Apr 26 19:40:36 2020 +0200

    Fix deprecated Gtk.Color. Use CSS for textview colors and font.

 data/ui/mainwindow.ui | 20 +++++++++++++
 src/MainWindow.vala   | 79 +++++++++++++++++++++++++++++++++++----------------
 src/Preferences.vala  |  6 ++--
 3 files changed, 78 insertions(+), 27 deletions(-)
---
diff --git a/data/ui/mainwindow.ui b/data/ui/mainwindow.ui
index 7bb703b..e52fa2f 100644
--- a/data/ui/mainwindow.ui
+++ b/data/ui/mainwindow.ui
@@ -440,6 +440,10 @@
                             <property name="wrap_mode">word-char</property>
                             <property name="left_margin">2</property>
                             <property name="right_margin">2</property>
+                            <style>
+                              <class name="TextviewColor"/>
+                              <class name="TextFont"/>
+                            </style>
                           </object>
                         </child>
                       </object>
@@ -467,6 +471,10 @@
                             <property name="editable">False</property>
                             <property name="left_margin">2</property>
                             <property name="right_margin">2</property>
+                            <style>
+                              <class name="TextviewColor"/>
+                              <class name="TextFont"/>
+                            </style>
                           </object>
                         </child>
                       </object>
@@ -578,6 +586,10 @@
                             <property name="wrap_mode">word-char</property>
                             <property name="left_margin">2</property>
                             <property name="right_margin">2</property>
+                            <style>
+                              <class name="TextviewColor"/>
+                              <class name="TextFont"/>
+                            </style>
                           </object>
                         </child>
                       </object>
@@ -605,6 +617,10 @@
                             <property name="editable">False</property>
                             <property name="left_margin">2</property>
                             <property name="right_margin">2</property>
+                            <style>
+                              <class name="TextviewColor"/>
+                              <class name="TextFont"/>
+                            </style>
                           </object>
                         </child>
                       </object>
@@ -677,6 +693,10 @@
                     <property name="invisible_char">●</property>
                     <property name="primary_icon_activatable">False</property>
                     <property name="secondary_icon_activatable">False</property>
+                    <style>
+                      <class name="TextInputColor"/>
+                      <class name="TextFont"/>
+                    </style>
                   </object>
                   <packing>
                     <property name="expand">True</property>
diff --git a/src/MainWindow.vala b/src/MainWindow.vala
index c78a58d..aa85f0e 100644
--- a/src/MainWindow.vala
+++ b/src/MainWindow.vala
@@ -379,13 +379,13 @@ public class moserial.MainWindow : Gtk.Window // Have to extend Gtk.Winow to get
         }
     }
 
-    private void clearIncoming() {
-        incomingHexTextBuffer.clear();
+    private void clearIncoming () {
+        incomingHexTextBuffer.clear ();
         incomingAsciiTextBuffer.set_text ("", 0);
     }
 
-    private void clearOutgoing() {
-        outgoingHexTextBuffer.clear();
+    private void clearOutgoing () {
+        outgoingHexTextBuffer.clear ();
         outgoingAsciiTextBuffer.set_text ("", 0);
     }
 
@@ -658,29 +658,60 @@ public class moserial.MainWindow : Gtk.Window // Have to extend Gtk.Winow to get
             font = Preferences.getSystemDefaultMonospaceFont ();
         else
             font = currentPreferences.font;
-        incomingAsciiTextView.override_font (Pango.FontDescription.from_string (font));
-        incomingAsciiTextView.modify_text (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.fontColor));
-        incomingAsciiTextView.modify_base (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.backgroundColor));
-        echoTag.foreground = currentPreferences.highlightColor;
 
-        incomingHexTextView.override_font (Pango.FontDescription.from_string (font));
-        incomingHexTextView.modify_text (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.fontColor));
-        incomingHexTextView.modify_base (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.backgroundColor));
-        incomingHexTextBuffer.applyPreferences (currentPreferences);
+        Pango.FontDescription fd = Pango.FontDescription.from_string (font);
 
-        outgoingAsciiTextView.override_font (Pango.FontDescription.from_string (font));
-        outgoingAsciiTextView.modify_text (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.fontColor));
-        outgoingAsciiTextView.modify_base (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.backgroundColor));
+        string unit = "px";
+        if (Gtk.check_version (3, 22, 0) == null) {
+            unit = "pt";
+        }
 
-        outgoingHexTextView.override_font (Pango.FontDescription.from_string (font));
-        outgoingHexTextView.modify_text (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.fontColor));
-        outgoingHexTextView.modify_base (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.backgroundColor));
-        outgoingHexTextBuffer.applyPreferences (currentPreferences);
+        var family = fd.get_family ().split (",")[0];
+        int size = (int) Math.round (fd.get_size () / Pango.SCALE);
+        int weight = (int) fd.get_weight ();
 
-        entry.modify_font (Pango.FontDescription.from_string (font));
-        entry.modify_text (Gtk.StateType.NORMAL, Preferences.getGdkColor (currentPreferences.fontColor));
-        entry.modify_base (Gtk.StateType.NORMAL, Preferences.getGdkColor 
(currentPreferences.backgroundColor));
+        var style = """
+            .TextviewColor text {
+                color: %s;
+                background-color: %s;
+            }
+            .TextInputColor {
+                color: %s;
+                background-color: %s;
+            }
+            .TextFont {
+                font-family: %s;
+                font-size: %d%s;
+                font-weight: %d;
+            }
+        """.printf (
+            currentPreferences.fontColor,
+            currentPreferences.backgroundColor,
+            currentPreferences.fontColor,
+            currentPreferences.backgroundColor,
+            family,
+            size,
+            unit,
+            weight
+                    );
+
+        var css_provider = new Gtk.CssProvider ();
 
+        try {
+            css_provider.load_from_data (style, -1);
+        } catch (GLib.Error e) {
+            warning ("Failed to parse CSS style : %s", e.message);
+        }
+
+        Gtk.StyleContext.add_provider_for_screen (
+            Gdk.Screen.get_default (),
+            css_provider,
+            Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
+        );
+
+        echoTag.foreground = currentPreferences.highlightColor;
+        incomingHexTextBuffer.applyPreferences (currentPreferences);
+        outgoingHexTextBuffer.applyPreferences (currentPreferences);
         profileChanged = true;
     }
 
@@ -1018,8 +1049,8 @@ public class moserial.MainWindow : Gtk.Window // Have to extend Gtk.Winow to get
     }
 
     private void clear () {
-        this.clearOutgoing();
-        this.clearIncoming();
+        this.clearOutgoing ();
+        this.clearIncoming ();
         entry.set_text ("");
     }
 }
diff --git a/src/Preferences.vala b/src/Preferences.vala
index e33deb6..3d8b9d5 100644
--- a/src/Preferences.vala
+++ b/src/Preferences.vala
@@ -69,9 +69,9 @@ public class Preferences : GLib.Object {
         return value;
     }
 
-    public static Gdk.Color getGdkColor (string color) {
-        Gdk.Color c;
-        Gdk.Color.parse (color, out c);
+    public static Gdk.RGBA getGdkRGBA (string color) {
+        Gdk.RGBA c = Gdk.RGBA ();
+        c.parse(color);
         return c;
     }