[Samples] some more widgets (#13)

[Samples] Label, LevelBar, ProgressBar and Spinner sections

Source/Samples/Sections/Widgets/LabelSection.cs

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+// This is free and unencumbered software released into the public domain.
+// Happy coding!!! - GtkSharp Team
+
+using Gtk;
+
+namespace Samples
+{
+    [Section(ContentType = typeof(Label), Category = Category.Widgets)]
+    class LabelSection : ListSection
+    {
+        public LabelSection()
+        {
+            AddItem(CreateSimpleLabel());
+            AddItem(CreateMarkupLabel());
+        }
+
+        public (string, Widget) CreateSimpleLabel()
+        {
+            var label = new Label();
+
+            // can be defined at constructor
+            label.LabelProp = "This is a label";
+
+            // right align text, center is default
+            label.Xalign = 1f; 
+
+            return ("Label :", label);
+        }
+
+        public (string, Widget) CreateMarkupLabel()
+        {
+            var label = new Label();
+
+            // activate markup, default is false
+            label.UseMarkup = true;
+
+            // define label with pango markup
+            label.LabelProp = "This is a <span foreground=\"red\" size=\"large\">label</span> with <b>custom</b> markup";
+
+            // right align text, center is default
+            label.Xalign = 1f;
+
+            return ("Label Markup:", label);
+        }
+
+    }
+}

Source/Samples/Sections/Widgets/LevelBarSection.cs

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+// This is free and unencumbered software released into the public domain.
+// Happy coding!!! - GtkSharp Team
+
+using Gtk;
+
+namespace Samples
+{
+    [Section(ContentType = typeof(LevelBar), Category = Category.Widgets)]
+    class LevelBarSection : ListSection
+    {
+        public LevelBarSection()
+        {
+            AddItem(CreateSimpleLevelBar());
+        }
+
+        public (string, Widget) CreateSimpleLevelBar()
+        {
+            // constructor takes MinValue, MaxValue
+            var lb = new LevelBar(0, 100);
+
+            // lets add a visible request size in our example
+            lb.WidthRequest = 100;
+
+            // set the value to 75%
+            lb.Value = 75d;
+
+            return ("Level Bar:", lb);
+        }
+
+    }
+}

Source/Samples/Sections/Widgets/ProgressBarSection.cs

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+// This is free and unencumbered software released into the public domain.
+// Happy coding!!! - GtkSharp Team
+
+using Gtk;
+using System;
+using System.Timers;
+
+namespace Samples
+{
+    [Section(ContentType = typeof(ProgressBar), Category = Category.Widgets)]
+    class ProgressBarSection : ListSection
+    {
+        public ProgressBarSection()
+        {
+            AddItem(CreateSimpleProgressBar());
+            AddItem(CreateFractionProgressBar());
+            AddItem(CreatePulseProgressBar());
+        }
+
+        public (string, Widget) CreateSimpleProgressBar()
+        {
+            var pb = new ProgressBar();
+
+            // lets add a visible request size in our example
+            pb.WidthRequest = 100;
+
+            // add a text
+            pb.Text = "Some progress...";
+
+            // to show text it must be set to true
+            pb.ShowText = true;
+
+            // progressbar is used in percentage mode values between 0.0 and 1.0
+            pb.Fraction = 0.60d;
+
+            return ("Progress Bar:", pb);
+        }
+
+        public (string, Widget) CreateFractionProgressBar()
+        {
+            // this is used when application can report progress
+
+            var pb = new ProgressBar();
+
+            pb.WidthRequest = 200;
+
+            pb.Text = "0%";
+            pb.ShowText = true;
+            pb.Fraction = 0d;
+
+            // lets add a timer to demo it
+            var timer = new Timer();
+            timer.Interval = 1000;
+
+            timer.Elapsed += (sender, e) =>
+            {
+                pb.Fraction += 0.1d;
+                if (pb.Fraction >= 1d)
+                    pb.Fraction = 0d;
+
+                pb.Text = $"{Math.Truncate(pb.Fraction * 100)}%";
+            };
+
+            timer.Start();
+
+            return ("Progress Bar with fraction:", pb);
+        }
+
+        public (string, Widget) CreatePulseProgressBar()
+        {
+            // this is used when application can report progress
+
+            var pb = new ProgressBar();
+
+            pb.WidthRequest = 200;
+
+            pb.Text = "Task time is unknown";
+            pb.ShowText = true;
+
+            // define how much is the pulse step
+            pb.PulseStep = 0.1d;
+
+            // lets add a timer to demo it
+            var timer = new Timer();
+            timer.Interval = 200;
+
+            timer.Elapsed += (sender, e) => pb.Pulse();
+
+            timer.Start();
+
+            return ("Progress Bar with pulse:", pb);
+        }
+
+    }
+}

Source/Samples/Sections/Widgets/SpinnerSection.cs

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+// This is free and unencumbered software released into the public domain.
+// Happy coding!!! - GtkSharp Team
+
+using Gtk;
+
+namespace Samples
+{
+    [Section(ContentType = typeof(Spinner), Category = Category.Widgets)]
+    class SpinnerSection : ListSection
+    {
+        public SpinnerSection()
+        {
+            AddItem(CreateSimpleSpinner());
+        }
+
+        public (string, Widget) CreateSimpleSpinner()
+        {
+            var sp = new Spinner();
+
+            sp.Start();
+
+            // can be stopped with
+            // Stop()
+
+            return ("Simple Spinner:", sp);
+        }
+    }
+}