[chronojump] Preferences webcam. Better sensitivity on change camera.

[Xavier de Blas <xaviblas src gnome org>]

commit a510500c6cea519115703ee1bf5215a673fe7322
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Nov 4 14:31:20 2019 +0100

    Preferences webcam. Better sensitivity on change camera.

 src/gui/preferences.cs | 22 ++++++++++++++++++++++
 src/utilGtk.cs         |  6 ++++++
 2 files changed, 28 insertions(+)
---
diff --git a/src/gui/preferences.cs b/src/gui/preferences.cs
index ba25bdd9..55d059fe 100644
--- a/src/gui/preferences.cs
+++ b/src/gui/preferences.cs
@@ -699,6 +699,7 @@ public class PreferencesWindow
                //UtilGtk.ComboUpdate(combo_camera, wd_list.GetCodes());
                UtilGtk.ComboUpdate(combo_camera, wd_list.GetFullnames());
                hbox_combo_camera.PackStart(combo_camera, true, true, 0);
+               combo_camera.Changed += new EventHandler (on_combo_camera_changed);
                hbox_combo_camera.ShowAll();
 
                //if(current >= devices.Count)
@@ -836,6 +837,26 @@ public class PreferencesWindow
                hbox_camera_stop_after_seconds.Visible = check_camera_stop_after.Active;
        }
 
+       private void on_combo_camera_changed (object o, EventArgs args)
+       {
+               //if camera changes then do not allow to view/change format, resolution, framerate, or 
preview until configure button is clicked
+               label_camera_pixel_format_current.Visible = false;
+               label_camera_resolution_current.Visible = false;
+               label_camera_framerate_current.Visible = false;
+
+               hbox_combo_camera_pixel_format.Visible = false;
+               hbox_combo_camera_resolution.Visible = false;
+               hbox_combo_camera_framerate.Visible = false;
+
+               //blank camera values
+               UtilGtk.ComboDelAll(combo_camera_pixel_format);
+               UtilGtk.ComboDelAll(combo_camera_resolution);
+               UtilGtk.ComboDelAll(combo_camera_framerate);
+
+               //do not allow to preview
+               button_video_preview.Sensitive = false;
+       }
+
        private void on_combo_camera_pixel_format_changed (object o, EventArgs args)
        {
                string pixelFormat = UtilGtk.ComboGetActive(combo_camera_pixel_format);
@@ -957,6 +978,7 @@ public class PreferencesWindow
                        string currentPixelFormat = getSelectedPixelFormat();
                        UtilGtk.ComboUpdate(combo_camera_pixel_format, wfsm.GetPixelFormats());
                        combo_camera_pixel_format.Active = UtilGtk.ComboMakeActive(combo_camera_pixel_format, 
currentPixelFormat);
+                       button_video_preview.Sensitive = true;
 
                        /*
                        //not shown because label is shown
diff --git a/src/utilGtk.cs b/src/utilGtk.cs
index 38b30faf..b7d39077 100644
--- a/src/utilGtk.cs
+++ b/src/utilGtk.cs
@@ -128,6 +128,12 @@ public class UtilGtk
                } while (myCombo.Model.IterNext (ref iter));
        }
 
+       //used on gui/preferences camera
+       public static void ComboDelAll(ComboBox myCombo)
+       {
+               comboDelAll(myCombo);
+       }
+
        private static void comboDelAll(ComboBox myCombo) {
                //myCombo = ComboBox.NewText(); don't work
                TreeIter myIter;