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Viewing changes to external/xwt/Xwt.Gtk/Xwt.GtkBackend/CanvasBackend.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/xwt/Xwt.Gtk/Xwt.GtkBackend/CanvasBackend.cs
 
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// 
 
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// CanvasBackend.cs
 
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//  
 
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// Author:
 
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//       Lluis Sanchez <lluis@xamarin.com>
 
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// 
 
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// Copyright (c) 2011 Xamarin Inc
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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using System.Collections.Generic;
 
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using Xwt.Backends;
 
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using System.Linq;
 
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using Xwt.Engine;
 
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using Xwt.CairoBackend;
 
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namespace Xwt.GtkBackend
 
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{
 
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        public class CanvasBackend: WidgetBackend, ICanvasBackend
 
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        {
 
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                public CanvasBackend ()
 
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                {
 
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                }
 
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                public override void Initialize ()
 
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                {
 
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                        Widget = new CustomCanvas ();
 
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                        Widget.Frontend = Frontend;
 
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                        Widget.EventSink = EventSink;
 
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                        Widget.Events |= Gdk.EventMask.ButtonPressMask | Gdk.EventMask.ButtonReleaseMask | Gdk.EventMask.PointerMotionMask;
 
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                        Widget.Show ();
 
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                }
 
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                new CustomCanvas Widget {
 
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                        get { return (CustomCanvas)base.Widget; }
 
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                        set { base.Widget = value; }
 
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                }
 
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                protected new ICanvasEventSink EventSink {
 
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                        get { return (ICanvasEventSink)base.EventSink; }
 
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                }
 
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                public void QueueDraw ()
 
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                {
 
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                        Widget.QueueDraw ();
 
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                }
 
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                public void QueueDraw (Rectangle rect)
 
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                {
 
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                        Widget.QueueDrawArea ((int)rect.X, (int)rect.Y, (int)rect.Width, (int)rect.Height);
 
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                }
 
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                public Rectangle Bounds {
 
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                        get {
 
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                                return new Rectangle (0, 0, Widget.Allocation.Width, Widget.Allocation.Height);
 
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                        }
 
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                }
 
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                public void AddChild (IWidgetBackend widget, Rectangle bounds)
 
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                {
 
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                        var w = ((IGtkWidgetBackend)widget).Widget;
 
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                        Widget.Add (w);
 
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                        Widget.SetAllocation (w, bounds);
 
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                }
 
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                public void RemoveChild (IWidgetBackend widget)
 
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                {
 
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                        var w = ((IGtkWidgetBackend)widget).Widget;
 
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                        Widget.Remove (w);
 
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                }
 
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                public void SetChildBounds (IWidgetBackend widget, Rectangle bounds)
 
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                {
 
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                        var w = ((IGtkWidgetBackend)widget).Widget;
 
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                        Widget.SetAllocation (w, bounds);
 
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                }
 
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        }
 
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        class CustomCanvas: Gtk.EventBox
 
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        {
 
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                public Widget Frontend;
 
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                public ICanvasEventSink EventSink;
 
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                Dictionary<Gtk.Widget, Rectangle> children = new Dictionary<Gtk.Widget, Rectangle> ();
 
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                public CustomCanvas ()
 
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                {
 
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                        GtkWorkarounds.FixContainerLeak (this);
 
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                        WidgetFlags |= Gtk.WidgetFlags.AppPaintable;
 
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                }
 
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                public void SetAllocation (Gtk.Widget w, Rectangle rect)
 
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                {
 
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                        children [w] = rect;
 
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                        QueueResize ();
 
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                }
 
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                protected override void OnAdded (Gtk.Widget widget)
 
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                {
 
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                        children.Add (widget, new Rectangle (0,0,0,0));
 
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                        widget.Parent = this;
 
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                        QueueResize ();
 
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                }
 
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                protected override void OnRemoved (Gtk.Widget widget)
 
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                {
 
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                        children.Remove (widget);
 
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                        widget.Unparent ();
 
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                }
 
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                protected override void OnSizeRequested (ref Gtk.Requisition requisition)
 
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                {
 
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                        base.OnSizeRequested (ref requisition);
 
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                        IWidgetSurface ws = Frontend.Surface;
 
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                        int h, w;
 
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                        if (ws.SizeRequestMode == SizeRequestMode.HeightForWidth) {
 
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                                w = (int)ws.GetPreferredWidth ().MinSize;
 
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                                h = (int)ws.GetPreferredHeightForWidth (w).MinSize;
 
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                        } else {
 
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                                h = (int)ws.GetPreferredHeight ().MinSize;
 
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                                w = (int)ws.GetPreferredWidthForHeight(h).MinSize;
 
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                        }
 
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                        if (requisition.Width < w)
 
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                                requisition.Width = w;
 
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                        if (requisition.Height < h)
 
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                                requisition.Height = h;
 
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                        foreach (var cr in children)
 
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                                cr.Key.SizeRequest ();
 
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                }
 
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                protected override void OnUnrealized ()
 
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                {
 
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                        base.OnUnrealized ();
 
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                        lastAllocation = new Gdk.Rectangle ();
 
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                }
 
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                Gdk.Rectangle lastAllocation;
 
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                protected override void OnSizeAllocated (Gdk.Rectangle allocation)
 
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                {
 
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                        base.OnSizeAllocated (allocation);
 
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                        if (!lastAllocation.Equals (allocation))
 
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                                ((IWidgetSurface)Frontend).Reallocate ();
 
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                        lastAllocation = allocation;
 
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                        foreach (var cr in children) {
 
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                                var r = cr.Value;
 
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                                cr.Key.SizeAllocate (new Gdk.Rectangle ((int)r.X, (int)r.Y, (int)r.Width, (int)r.Height));
 
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                        }
 
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                }
 
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                protected override void ForAll (bool includeInternals, Gtk.Callback callback)
 
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                {
 
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                        base.ForAll (includeInternals, callback);
 
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                        foreach (var c in children.Keys.ToArray ())
 
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                                callback (c);
 
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                }
 
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                protected override bool OnExposeEvent (Gdk.EventExpose evnt)
 
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                {
 
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                        Toolkit.Invoke (delegate {
 
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                                using (var context = CreateContext ()) {
 
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                                        var a = evnt.Area;
 
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                                        EventSink.OnDraw (context, new Rectangle (a.X, a.Y, a.Width, a.Height));
 
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                                }
 
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                        });
 
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                        return base.OnExposeEvent (evnt);
 
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                }
 
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                public CairoContextBackend CreateContext ()
 
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                {
 
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                        CairoContextBackend ctx = new CairoContextBackend ();
 
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                        if (!IsRealized) {
 
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                                Cairo.Surface sf = new Cairo.ImageSurface (Cairo.Format.ARGB32, 1, 1);
 
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                                Cairo.Context c = new Cairo.Context (sf);
 
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                                ctx.Context = c;
 
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                                ctx.TempSurface = sf;
 
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                        } else {
 
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                                ctx.Context = Gdk.CairoHelper.Create (GdkWindow);
 
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                        }
 
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                        return ctx;
 
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                }
 
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        }
 
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}
 
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