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//
// BoxBackend.cs
//
// Author:
// Carlos Alberto Cortez <calberto.cortez@gmail.com>
//
// Copyright (c) 2012 Carlos Alberto Cortez
//
// 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 System.Linq;
using System.Text;
using SW = System.Windows;
using SWC = System.Windows.Controls;
using Xwt.Backends;
using Xwt.Drawing;
namespace Xwt.WPFBackend
{
public class BoxBackend : WidgetBackend, IBoxBackend
{
public BoxBackend ()
{
Widget = new CustomPanel ();
}
new CustomPanel Widget {
get { return (CustomPanel)base.Widget; }
set { base.Widget = value; }
}
public void Add (IWidgetBackend widget)
{
Widget.Children.Add (GetFrameworkElement (widget));
}
public void Remove (IWidgetBackend widget)
{
Widget.Children.Remove (GetFrameworkElement (widget));
}
public void SetAllocation (IWidgetBackend [] widget, Rectangle [] rect)
{
Widget.SetAllocation (widget, rect);
}
}
// A Canvas cannot be used, as manually setting Width/Height disables the
// expected behavior of DesiredSize (used in the GetPreferredSize* methods).
public class CustomPanel : SWC.Panel, IWpfWidget
{
IWidgetBackend [] widgets;
Rectangle [] rects;
public WidgetBackend Backend { get; set; }
public Action<System.Windows.Media.DrawingContext> RenderAction;
protected override void OnRender (System.Windows.Media.DrawingContext dc)
{
var render = RenderAction;
if (render != null)
render (dc);
base.OnRender (dc);
}
protected override System.Windows.Size MeasureOverride (System.Windows.Size constraint)
{
var s = base.MeasureOverride (constraint);
return Backend.MeasureOverride (constraint, s);
}
public void SetAllocation (IWidgetBackend[] widgets, Rectangle[] rects)
{
this.widgets = widgets;
this.rects = rects;
ArrangeChildren (true);
}
// Whenever a control gets a change affecting its size/appearance,
// it keep literaly *waiting* for a call to Arrange(), sometimes even if not truly needed.
// In this cases ArrangeOverride is called, and we 'refresh' the controls that require it
// (this is done by all the containers inheriting from Panel).
protected override SW.Size ArrangeOverride (SW.Size finalSize)
{
ArrangeChildren (false);
return base.ArrangeOverride (finalSize);
}
void ArrangeChildren (bool force)
{
if (widgets == null || rects == null)
return;
// Use the 'widgets' field so we can easily map a control position by looking at 'rects'.
for (int i = 0; i < widgets.Length; i++) {
var element = WidgetBackend.GetFrameworkElement (widgets [i]);
if (!element.IsArrangeValid || force) {
// Measure the widget again using the allocation constraints. This is necessary
// because WPF widgets my cache some measurement information based on the
// constraints provided in the last Measure call (which when calculating the
// preferred size is normally set to infinite.
element.InvalidateMeasure ();
element.Measure (new SW.Size (rects[i].Width, rects[i].Height));
element.Arrange (rects[i].ToWpfRect ());
element.UpdateLayout ();
}
}
}
}
}
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