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