[java-gnome-hackers] Fwd: [Java-gnome-developer] Create a custom GTK RoundedFrame in Java Gnome

[Serkan K. <se...@ge...>]

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Forwarding to -hackers. Since future development discussions take place
there.

Personally this has always been my dream, as well as being able to
create widget's in pure Java (like being able to write rendering code in
pure Java) but afair it's not currently possible?

Does anybody have any idea how much work this needs and where the
changes need to be?

Regards,
Serkan

- -------- Original Message --------
Subject: [Java-gnome-developer] Create a custom GTK RoundedFrame in
Java	Gnome
Date: Wed, 20 Oct 2010 16:15:26 +0200
From: bob <loi...@pa...>
To: jav...@li...

When I'm reading the banshee source (C# language), I found how to create
a custom component in C#. It's very simple, the developer had to extend
the Gtk.Bin Object.

I search to do the same thing in Java but I don't found any "simple"
solution, we couldn't extends the Bin object.

I think it is possible to create this component in C and create binding
like all object in java-gnome but it's not very simple (add C code and
add Java binding working with java-gnome).

There is a solution to create a custom widget in Java ? Could you update
the java-gnome library to do it ?

//
// The custom GTK widget RoundedFrame
//

namespace Hyena.Widgets
{
    public class RoundedFrame : Bin
    {
        private Theme theme;
        protected Theme Theme {
            get { return theme; }
        }

        private Widget child;
        private Gdk.Rectangle child_allocation;
        private bool fill_color_set;
        private Cairo.Color fill_color;
        private bool draw_border = true;
        private Pattern fill_pattern;
        private int frame_width;

        // Ugh, this is to avoid the GLib.MissingIntPtrCtorException
seen by some; BGO #552169
        protected RoundedFrame (IntPtr ptr) : base (ptr)
        {
        }

        public RoundedFrame ()
        {
        }

        public void SetFillColor (Cairo.Color color)
        {
            fill_color = color;
            fill_color_set = true;
            QueueDraw ();
        }

        public void UnsetFillColor ()
        {
            fill_color_set = false;
            QueueDraw ();
        }

        public Pattern FillPattern {
            get { return fill_pattern; }
            set {
                fill_pattern = value;
                QueueDraw ();
            }
        }

        public bool DrawBorder {
            get { return draw_border; }
            set { draw_border = value; QueueDraw (); }
        }

#region Gtk.Widget Overrides

        protected override void OnStyleSet (Style previous_style)
        {
            base.OnStyleSet (previous_style);
            theme = Hyena.Gui.Theming.ThemeEngine.CreateTheme (this);
            frame_width = (int)theme.Context.Radius + 1;
        }

        protected override void OnSizeRequested (ref Requisition
requisition)
        {
            if (child != null && child.Visible) {
                // Add the child's width/height
                Requisition child_requisition = child.SizeRequest ();
                requisition.Width = Math.Max (0,
child_requisition.Width);
                requisition.Height = child_requisition.Height;
            } else {
                requisition.Width = 0;
                requisition.Height = 0;
            }

            // Add the frame border
            requisition.Width += ((int)BorderWidth + frame_width) * 2;
            requisition.Height += ((int)BorderWidth + frame_width) * 2;
        }

        protected override void OnSizeAllocated (Gdk.Rectangle
allocation)
        {
            base.OnSizeAllocated (allocation);

            child_allocation = new Gdk.Rectangle ();

            if (child == null || !child.Visible) {
                return;
            }

            child_allocation.X = (int)BorderWidth + frame_width;
            child_allocation.Y = (int)BorderWidth + frame_width;
            child_allocation.Width = (int)Math.Max (1, Allocation.Width
- - child_allocation.X * 2);
            child_allocation.Height = (int)Math.Max (1,
Allocation.Height - child_allocation.Y -
                (int)BorderWidth - frame_width);

            child_allocation.X += Allocation.X;
            child_allocation.Y += Allocation.Y;

            child.SizeAllocate (child_allocation);
        }

        protected override void OnSetScrollAdjustments (Adjustment hadj,
Adjustment vadj)
        {
            // This is to satisfy the gtk_widget_set_scroll_adjustments
            // inside of GtkScrolledWindow so it doesn't complain about
            // its child not being scrollable.
        }

        protected override bool OnExposeEvent (Gdk.EventExpose evnt)
        {
            if (!IsDrawable) {
                return false;
            }

            Cairo.Context cr = Gdk.CairoHelper.Create (evnt.Window);

            try {
                DrawFrame (cr, evnt.Area);
                if (child != null) {
                    PropagateExpose (child, evnt);
                }
                return false;
            } finally {
                CairoExtensions.DisposeContext (cr);
            }
        }

        private void DrawFrame (Cairo.Context cr, Gdk.Rectangle clip)
        {
            int x = child_allocation.X - frame_width;
            int y = child_allocation.Y - frame_width;
            int width = child_allocation.Width + 2 * frame_width;
            int height = child_allocation.Height + 2 * frame_width;

            Gdk.Rectangle rect = new Gdk.Rectangle (x, y, width,
height);

            theme.Context.ShowStroke = draw_border;

            if (fill_color_set) {
                theme.DrawFrameBackground (cr, rect, fill_color);
            } else if (fill_pattern != null) {
                theme.DrawFrameBackground (cr, rect, fill_pattern);
            } else {
                theme.DrawFrameBackground (cr, rect, true);
                theme.DrawFrameBorder (cr, rect);
            }
        }

#endregion

#region Gtk.Container Overrides

        protected override void OnAdded (Widget widget)
        {
            child = widget;
            base.OnAdded (widget);
        }

        protected override void OnRemoved (Widget widget)
        {
            if (child == widget) {
                child = null;
            }

            base.OnRemoved (widget);
        }

#endregion

    }
}


-
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