// 渲染并保存图片：传入文件全路径、要渲染的ItemsControl
// todo 做成全局菜单栏里保存的方式
public static void RenderImage(string path, ItemsControl itemsControl)
{
// 直接关闭导出窗口时path为空
if (path == null)
{
return;
}
// 构造渲染图片的容器
PixelSize pixelSize = new PixelSize((int)itemsControl.Width * 2, (int)itemsControl.Height * 2);
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap(pixelSize, new Vector(192, 192));
// 在可视树上找到这个ItemsControl的的孩子ItemsPresenter
IEnumerator <IVisual> panelChildren = itemsControl.GetVisualChildren().GetEnumerator();
panelChildren.MoveNext();
// ListBox > Border > ScrollViewer > Grid > ScrollContentPresenter > ItemsPresenter
if (itemsControl is ListBox)
{
Border border = (Border)panelChildren.Current;
panelChildren = border.GetVisualChildren().GetEnumerator();
panelChildren.MoveNext();
ScrollViewer scrollViewer = (ScrollViewer)panelChildren.Current;
panelChildren = scrollViewer.GetVisualChildren().GetEnumerator();
panelChildren.MoveNext();
Grid grid = (Grid)panelChildren.Current;
panelChildren = grid.GetVisualChildren().GetEnumerator();
panelChildren.MoveNext();
ScrollContentPresenter scrollContentPresenter = (ScrollContentPresenter)panelChildren.Current;
panelChildren = scrollContentPresenter.GetVisualChildren().GetEnumerator();
panelChildren.MoveNext();
}
// ItemsControl > Border > ItemsPresenter
else
{
Border border = (Border)panelChildren.Current;
panelChildren = border.GetVisualChildren().GetEnumerator();
panelChildren.MoveNext();
}
ItemsPresenter itemsPresenter = (ItemsPresenter)panelChildren.Current;
// 渲染并保存
renderTargetBitmap.Render(itemsPresenter);
renderTargetBitmap.Save(path);
mainWindowVM.Tips = "导出图片至：" + path;
}
