canvas.gui: Add MessageBox class.

Use canvas.MessageBox.critical/warning/information/question
to show a standard, but also customizable dialog box.

Nasal/canvas/gui.nas

@@ -16,8 +16,9 @@ loadGUIFile("styles/DefaultStyle.nas");
 loadWidget("Button");
 loadWidget("Label");
 loadWidget("ScrollArea");
+loadDialog("MessageBox");
 
-var style = DefaultStyle.new("AmbianceClassic");
+var style = DefaultStyle.new("AmbianceClassic", "Humanity");
 var WindowButton = {
   new: func(parent, name)
   {
@@ -101,6 +102,10 @@ var Window = {
     me._node.remove();
     me._node = nil;
   },
+  setTitle: func(title)
+  {
+    return me.set("title", title);
+  },
   # Create the canvas to be used for this Window
   #
   # @return The new canvas

Nasal/canvas/gui/Style.nas

@@ -1,14 +1,16 @@
 gui.Style = {
-  new: func(name)
+  new: func(name, name_icon_theme)
   {
     var root_node = props.globals.getNode("/sim/gui/canvas", 1)
                                  .addChild("style");
-    var path = getprop("/sim/fg-root") ~ "/gui/styles/" ~ name;
+    var gui_path = getprop("/sim/fg-root") ~ "/gui";
+    var style_path = gui_path ~ "/styles/" ~ name;
 
     var m = {
       parents: [gui.Style],
-      _path: path,
-      _node: io.read_properties(path ~ "/style.xml", root_node),
+      _path: style_path,
+      _dir_icons: gui_path ~ "/icons/" ~ name_icon_theme,
+      _node: io.read_properties(style_path ~ "/style.xml", root_node),
       _colors: {}
     };
 

Nasal/canvas/gui/dialogs/MessageBox.nas

@@ -0,0 +1,170 @@
+var MessageBox = {
+  Ok:     0x0001,
+  Cancel: 0x0002,
+  Yes:    0x0004,
+  No:     0x0008,
+  new: func
+  {
+    return {
+      parents: [MessageBox],
+      _title: "Message",
+      _standard_buttons: MessageBox.Ok
+    };
+  },
+  setTitle: func(title)
+  {
+    me._title = title;
+  },
+  setImage: func(img)
+  {
+    if( img != nil and img.find('/') < 0 )
+      me._img = style._dir_icons ~ "/" ~ img ~ ".png";
+    else
+      me._img = img;
+    return me;
+  },
+  setText: func(text)
+  {
+    me._text = text;
+    return me;
+  },
+  setStandardButtons: func(mask)
+  {
+    me._standard_buttons = mask;
+    return me;
+  },
+  exec: func(cb = nil)
+  {
+    var MARGIN = 8; # TODO implement margin in C++ layouting code
+    var dlg = canvas.Window.new([250,100], "dialog")
+                           .setTitle(me._title);
+    var root = dlg.getCanvas(1)
+                  .set("background", style.getColor("bg_color"))
+                  .createGroup();
+    var vbox = VBoxLayout.new();
+    dlg.setLayout(vbox);
+    vbox.addSpacing(MARGIN);
+
+    var text_box = HBoxLayout.new();
+    vbox.addItem(text_box);
+
+    text_box.addSpacing(MARGIN);
+
+    if( me._img != nil )
+    {
+      text_box.addItem(
+        gui.widgets.Label.new(root, style, {})
+                         .setFixedSize(48, 48)
+                         .setImage(me._img)
+      );
+    }
+
+    var label_text = gui.widgets.Label.new(root, style, {wordWrap: 1})
+                                      .setText(me._text);
+    text_box.addItem(label_text, 1);
+    text_box.addSpacing(MARGIN);
+
+    vbox.addStretch(1);
+
+    var button_box = HBoxLayout.new();
+    vbox.addItem(button_box);
+
+    button_box.addStretch(1);
+    foreach(var button; [me.Ok, me.Cancel, me.Yes, me.No])
+    {
+      if( !(me._standard_buttons & button) )
+        continue;
+
+      (func{
+        var b_id = button;
+        button_box.addItem(
+          gui.widgets.Button.new(root, style, {})
+                            .setText(me._button_names[button])
+                            .listen("clicked", func {
+                              dlg.del();
+                              if( cb != nil )
+                                cb(b_id);
+                            })
+        );
+      })();
+    }
+    button_box.addSpacing(MARGIN);
+
+    vbox.addSpacing(MARGIN);
+
+    return me;
+  },
+  show: func(title, text, icon = nil, cb = nil, buttons = nil)
+  {
+    var msg_box = MessageBox.new();
+    msg_box.setTitle(title);
+    msg_box.setText(text);
+
+    if( buttons == nil )
+      buttons = MessageBox.Ok;
+    msg_box.setStandardButtons(buttons);
+
+    if( icon != nil )
+      msg_box.setImage(icon);
+
+    return msg_box.exec(cb);
+  },
+  # Show an error/critical message in a message box
+  #
+  # @param title
+  # @param text
+  # @param cb       Dialog close callback
+  # @param buttons  Mask indicating the buttons to show
+  #                 (default: MessageBox.Ok)
+  critical: func(title, text, cb = nil, buttons = nil)
+  {
+    MessageBox.show(title, text, "dialog-error", cb, buttons);
+  },
+  # Show a warning message in a message box
+  #
+  # @param title
+  # @param text
+  # @param cb       Dialog close callback
+  # @param buttons  Mask indicating the buttons to show
+  #                 (default: MessageBox.Ok)
+  warning:  func(title, text, cb = nil, buttons = nil)
+  {
+    MessageBox.show(title, text, "dialog-warning", cb, buttons);
+  },
+  # Show an informative message in a message box
+  #
+  # @param title
+  # @param text
+  # @param cb       Dialog close callback
+  # @param buttons  Mask indicating the buttons to show
+  #                 (default: MessageBox.Ok)
+  information: func(title, text, cb = nil, buttons = nil)
+  {
+    MessageBox.show(title, text, "dialog-info", cb, buttons);
+  },
+  # Show a question in a message box
+  #
+  # @param title
+  # @param text
+  # @param cb       Dialog close callback
+  # @param buttons  Mask indicating the buttons to show
+  #                 (default: MessageBox.Yes | MessageBox.No)
+  question: func(title, text, cb = nil, buttons = nil)
+  {
+    MessageBox.show(
+      title,
+      text,
+      "dialog-question",
+      cb,
+      buttons or MessageBox.Yes | MessageBox.No
+    );
+  },
+# private:
+  _button_names: {}
+};
+
+# Standard button names
+MessageBox._button_names[ MessageBox.Ok     ] = "Ok";
+MessageBox._button_names[ MessageBox.Cancel ] = "Cancel";
+MessageBox._button_names[ MessageBox.Yes    ] = "Yes";
+MessageBox._button_names[ MessageBox.No     ] = "No";

Nasal/canvas/gui/styles/DefaultStyle.nas

@@ -1,7 +1,10 @@
 var DefaultStyle = {
-  new: func(name)
+  new: func(name, name_icon_theme)
   {
-    return { parents: [gui.Style.new(name), DefaultStyle] };
+    return {
+      parents: [ gui.Style.new(name, name_icon_theme),
+                 DefaultStyle ]
+    };
   },
   createWidget: func(parent, type, cfg)
   {

gui/icons/Humanity/AUTHORS

@@ -0,0 +1,20 @@
+####################
+ABOUT:             #
+####################
+
+Humanity is designed and developed by :
+	Daniel Foré <Daniel.p.Fore@gmail.com>,
+	K.Vishnoo Charan Reddy<vish@ubuntu.com>,
+	Jonian Guveli <jonian.guveli@gmail.com>.
+
+GNOME icons and Humanity icons are all licensed under the GPL.
+
+This package is licensed under GNU General Public License version 2.
+
+Icons based or directly from GNOME and other GNOME projects, licensed GPL.
+	You can visit the GNOME website here:
+		http://www.gnome.org/
+
+Icons based on Tango sources or taken from the Tango project are public domain.
+	You can visit the Tango project website here:
+		http://tango.freedesktop.org/Tango_Desktop_Project