109 строки
3.8 KiB
C#
109 строки
3.8 KiB
C#
//
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// CanvasCellViewBackend.cs
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//
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// Author:
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// David Karlaš <david.karlas@gmail.com>
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//
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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.Windows;
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using Xwt.Backends;
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namespace Xwt.WPFBackend
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{
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class CanvasCellViewPanel : CustomPanel
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{
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public CanvasCellViewPanel()
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{
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DataContextChanged += OnDataChanged;
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}
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void OnDataChanged(object sender, DependencyPropertyChangedEventArgs e)
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{
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if (e.OldValue != null && e.OldValue is ValuesContainer)
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((ValuesContainer)e.OldValue).PropertyChanged -= CanvasCellRenderer_PropertyChanged;
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if (e.NewValue is ValuesContainer)
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{
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((ValuesContainer)DataContext).PropertyChanged += CanvasCellRenderer_PropertyChanged;
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}
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}
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void CanvasCellRenderer_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
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{
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InvalidateMeasure();
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InvalidateVisual();
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}
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public event DependencyPropertyChangedEventHandler CellViewChanged;
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public static readonly DependencyProperty CellViewBackendProperty =
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DependencyProperty.Register("CellViewBackend", typeof(CellViewBackend),
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typeof(CanvasCellViewPanel), new FrameworkPropertyMetadata(new PropertyChangedCallback(OnCellViewChanged)));
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public CellViewBackend CellViewBackend
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{
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get { return (CellViewBackend)GetValue(CellViewBackendProperty); }
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set { SetValue(CellViewBackendProperty, value); }
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}
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public static void OnCellViewChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
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{
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var sl = sender as CanvasCellViewPanel;
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if (sl != null)
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sl.RaiseCellViewChangedEvent(e);
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}
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private void RaiseCellViewChangedEvent(DependencyPropertyChangedEventArgs e)
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{
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if (this.CellViewChanged != null)
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this.CellViewChanged(this, e);
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}
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protected override void OnRender(System.Windows.Media.DrawingContext dc)
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{
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base.OnRender(dc);
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CellViewBackend.Load (this);
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CellViewBackend.ApplicationContext.InvokeUserCode(delegate
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{
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DrawingContext ctx = new DrawingContext(dc, 1);
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((ICanvasCellViewFrontend)CellViewBackend.CellView).Draw(ctx, new Rectangle(this.RenderTransform.Value.OffsetX, this.RenderTransform.Value.OffsetY, this.RenderSize.Width, this.RenderSize.Height));
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});
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}
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protected override System.Windows.Size MeasureOverride(System.Windows.Size constraint)
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{
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var size = new System.Windows.Size();
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CellViewBackend.Load(this);
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CellViewBackend.ApplicationContext.InvokeUserCode(delegate
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{
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var s = ((ICanvasCellViewFrontend)CellViewBackend.CellView).GetRequiredSize();
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size = new System.Windows.Size(s.Width, s.Height);
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});
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if (size.Width > constraint.Width)
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size.Width = constraint.Width;
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if (size.Height > constraint.Height)
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size.Height = constraint.Height;
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return size;
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}
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}
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}
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