public PageRoutedEventArgs(RoutedEvent routedEvent, GraphicVisualPage source)
: base(routedEvent, source)
{
PageScale = source.PageScale;
PageSize = source.PageSize;
RenderSize = source.RenderSize;
//PageOffset = new Point(source.PageOffsetX, source.PageOffsetY);
PageOffset = source.PageOffset;
}
//
// Property Changed Callback
//
private static void VisualHostChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
GraphicVisualPage page = d as GraphicVisualPage;
if (e.OldValue != null)
{
page.Children.Remove((Visual)e.OldValue);
}
if (e.NewValue != null)
{
page.Children.Add((Visual)e.NewValue);
page.SetVisualHostTranform();
}
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
GraphicVisualPage page = GetTemplateChild("PART_Page") as GraphicVisualPage;
_page = page;
if (page != null)
{
page.PageSizeChanged += (sender, e) =>
{
SetScrollBars(e as PageRoutedEventArgs);
e.Handled = true;
};
page.PageScaleChanged += (sender, e) =>
{
SetScrollBars(e as PageRoutedEventArgs);
e.Handled = true;
};
page.PageRenderSizeChanged += (sender, e) =>
{
SetScrollBars(e as PageRoutedEventArgs);
e.Handled = true;
};
page.PageOffsetChanged += (sender, e) =>
{
// 强制刷新
OperatorAdorner.InvalidateVisual();
e.Handled = true;
};
}
AdornerDecorator addr = GetTemplateChild("PART_AdornerDecorator") as AdornerDecorator;
if (addr != null)
{
_operatorAdorner = new PageOperatorAdorner(page);
_operatorAdorner.DataContext = this;
//_pageAdorner.Canvas.Background = Brushes.LightGreen.Clone();
//_pageAdorner.Canvas.Background.Opacity = 0.3;
addr.AdornerLayer.Add(_operatorAdorner);
}
}
//
// Property Changed Callback
//
private static void PageScaleChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
// 页面比例缩放时，同时调整页面偏移量，保证画面中心位置不变
//
double delt = (double)e.NewValue / (double)e.OldValue;
GraphicVisualPage page = d as GraphicVisualPage;
double offsetX = page.PageOffset.X * delt + page.ActualWidth / 2.0 * (1.0 - delt);
double offsetY = page.PageOffset.Y * delt + page.ActualHeight / 2.0 * (1.0 - delt);
page.PageOffset = new Point(offsetX, offsetY);
// 更新网格 Update grid
page.UpdateGridVisual();
// 激发 PageScaleChangedEvent 事件
// Raise PageScaleChangedEvent
page.RaiseEvent(new PageRoutedEventArgs(PageScaleChangedEvent, page));
}
