public static void SafeBeginInit(this FrameworkElement reference)
{
if (reference.CheckAccess())
{
reference.BeginInit();
}
else
{
reference.Dispatcher.Invoke(new Action(delegate { reference.BeginInit(); }));
}
}
private void LoadForm(string form)
{
StreamReader mysr = new StreamReader(form);
FrameworkElement rootObject = XamlReader.Load(mysr.BaseStream) as FrameworkElement;
for (int radioButtons = 0; radioButtons < 7; radioButtons++)
{
RadioButton rButton = LogicalTreeHelper.FindLogicalNode(rootObject, "R" + radioButtons) as RadioButton;
if (rButton != null)
{
rButton.Click += UpdateValidation;
}
}
display.Children.Clear();
display.Children.Add(rootObject);
rootObject.BeginInit();
display.DataContext = Respondent;
//rootObject.Measure(renderingSize);
//rootObject.Arrange(renderingRectangle);
rootObject.EndInit();
rootObject.UpdateLayout();
}
private void SetElemVisible(FrameworkElement elem)
{
if (elem.Visibility == System.Windows.Visibility.Visible)
{
return;
}
mainGrid.BeginInit();
List <FrameworkElement> toInvis = new List <FrameworkElement>();
if (elem == lstResView)
{
toInvis.Add(leadPhoto);
}
else if (elem == leadPhoto)
{
toInvis.Add(lstResView);
}
foreach (var e in toInvis)
{
e.BeginInit();
if (e.Visibility == System.Windows.Visibility.Visible && backupRow != null)
{
Grid.SetRow(e, backupRow.Value);
backupRow = null;
}
e.Visibility = System.Windows.Visibility.Collapsed;
e.EndInit();
}
elem.BeginInit();
backupRow = Grid.GetRow(elem);
Grid.SetRow(elem, 1);
elem.Visibility = System.Windows.Visibility.Visible;
elem.EndInit();
mainGrid.EndInit();
}
private static void ClearDimensions(FrameworkElement tabItem)
{
// remove any size restrictions from the Header,
// this is because the TabControl's size restriction properties takes precedence over
// the individual tab items
// eg, if the TabControl sets the TabItemMaxWidth property to 300, but the Header
// has a minWidth of 400, the TabControls value of 300 should be used
tabItem.BeginInit();
tabItem.Height = double.NaN;
tabItem.Width = double.NaN;
tabItem.MaxHeight = double.PositiveInfinity;
tabItem.MaxWidth = double.PositiveInfinity;
tabItem.MinHeight = 0;
tabItem.MinWidth = 0;
tabItem.EndInit();
}
private void InsertAdorners()
{
if (VisualTreeHelper.GetChildrenCount(AssociatedObject) == 0)
{
return;
}
AssociatedObject.LayoutUpdated -= AssociatedObjectLayoutUpdated;
_beginInt = AssociatedObject.IsInitialized;
if (!_beginInt)
{
AssociatedObject.BeginInit();
}
//
// Create visual for adorners
//
FrameworkElement topVisuals = TopTemplate.LoadContent() as FrameworkElement;
if (topVisuals != null)
{
var topBorder = topVisuals.FindName("AdornerBorder") as FrameworkElement;
if (topBorder != null)
{
var behaviors = Interaction.GetBehaviors(AssociatedObject);
var actualSizeBehavior =
behaviors.FirstOrDefault(b => b.GetType() == typeof(ActualSizeBindingBehavior))
as ActualSizeBindingBehavior;
if (actualSizeBehavior != null)
{
var widthBinding = new Binding
{
Source = actualSizeBehavior,
Path = new PropertyPath("ActualWidth"),
Converter = new DoubleToMarginLeftConverter()
};
topBorder.SetBinding(FrameworkElement.MarginProperty, widthBinding);
}
}
}
if (topVisuals != null && DataContext != null)
{
topVisuals.DataContext = DataContext;
}
//
// Setup intercept for supressing the connector nodes
//
_rootAdornerLayer = AdornerLayer.GetAdornerLayer(AssociatedObject);
if (_rootAdornerLayer != null)
{
_rootAdornerLayer.LayoutUpdated += AdornerLayerOnMouseLeave;
}
//
// Get controls from visual tree
//
Border childBorder = VisualTreeHelper.GetChild(AssociatedObject, 0) as Border;
if (childBorder == null)
{
return;
}
Grid hostGrid = childBorder.Child as Grid;
if (hostGrid == null)
{
return;
}
Border titleBarBorder = GetColoursBorder(hostGrid);
if (titleBarBorder == null)
{
return;
}
//
// Set colour attached properties
//
Binding backgroundBinding = new Binding("Background");
backgroundBinding.Source = titleBarBorder;
Binding borderBrushBinding = new Binding("BorderBrush");
borderBrushBinding.Source = titleBarBorder;
if (topVisuals != null)
{
topVisuals.BeginInit();
topVisuals.SetBinding(TitleBarBackgroundProperty, backgroundBinding);
topVisuals.SetBinding(TitleBarBorderBrushProperty, borderBrushBinding);
topVisuals.EndInit();
}
//
// Insert adorners
//
AdornerDecorator decorator = new AdornerDecorator();
childBorder.Child = null;
decorator.Child = hostGrid;
childBorder.Child = decorator;
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(hostGrid);
if (!_beginInt)
{
AssociatedObject.BeginInit();
}
TopVisualsAdornerWrapper topVisualsAdornerWrapper =
new TopVisualsAdornerWrapper(hostGrid, topVisuals, AssociatedObject);
adornerLayer.Add(topVisualsAdornerWrapper);
if (!_beginInt)
{
adornerLayer.EndInit();
AssociatedObject.EndInit();
}
AdornerToggleButtons.Clear();
topVisualsAdornerWrapper.Descendents().OfType <AdornerToggleButton>().ToList()
.ForEach(d =>
{
AdornerToggleButtons.Add(d);
d.Click += d_Click;
});
}
/// <summary>
/// Measure the tab items for docking at the left or right
/// </summary>
private Size MeasureVertical(Size availableSize)
{
ItemsControl ic = ItemsControl.GetItemsOwner(this);
if (ic == null || ic.Items.Count == 0)
{
return(new Size());
}
_maxChildWidthOrHeight = 0;
_actualChildCount = ic.Items.Count;
EnsureChildRects(_actualChildCount);
double extentHeight = 0;
double[] heights = new double[ic.Items.Count];
// we will first measure all the children with unlimited space to get their desired sizes
// this will also get us the height required for all TabItems
for (int i = 0; i < ic.Items.Count; i++)
{
FrameworkElement child = ic.Items[i] as FrameworkElement;
if (child == null)
{
return(new Size());
}
// reset any width/height constraints on the child,
// as the autosizing function does not support them
child.BeginInit();
child.Width = double.NaN;
child.MaxWidth = double.PositiveInfinity;
child.MinWidth = 0;
child.Height = double.NaN;
child.MaxHeight = double.PositiveInfinity;
child.MinHeight = 0;
child.EndInit();
child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
// calculate the maximum child width
_maxChildWidthOrHeight = Math.Max(_maxChildWidthOrHeight, Math.Ceiling(child.DesiredSize.Width));
// calculate the child width while respecting the Maximum & Minimum width constraints
heights[i] = Math.Min(MaximumChildHeight, Math.Max(MinimumChildHeight, Math.Ceiling(child.DesiredSize.Height)));
// determines how much horizontal space we require
extentHeight += heights[i];
}
_maxChildWidthOrHeight = Math.Max(MinimumChildWidth, Math.Min(MaximumChildWidth, _maxChildWidthOrHeight)); // observe the constraints
_extent = new Size(_maxChildWidthOrHeight, extentHeight);
bool flag = false;
// 1). all the children fit into the available space using there desired widths
if (extentHeight <= availableSize.Height)
{
_maxVisibleItems = ic.Items.Count;
FirstVisibleIndex = 0;
double top = 0;
for (int i = 0; i < _actualChildCount; i++)
{
_childRects[i] = new Rect(0, top, _maxChildWidthOrHeight, heights[i]);
top += heights[i];
}
CanScrollLeftOrUp = false;
CanScrollRightOrDown = false;
flag = true;
}
// 2). all the children fit in the available space if we reduce their widths to a uniform value
// while staying within the MinimumChildWidth and MaximumChildWidth constraints
if (!flag)
{
// make sure the width is not greater than the MaximumChildWidth constraints
double targetHeight = Math.Min(MaximumChildHeight, availableSize.Height / _actualChildCount);
// target width applies now if whether we can fit all items in the available space or whether we are scrolling
if (targetHeight >= MinimumChildHeight)
{
_maxVisibleItems = ic.Items.Count;
FirstVisibleIndex = 0;
extentHeight = 0;
double top = 0;
for (int i = 0; i < _actualChildCount; i++)
{
extentHeight += targetHeight;
heights[i] = targetHeight;
_childRects[i] = new Rect(0, top, _maxChildWidthOrHeight, heights[i]);
top += heights[i];
}
_extent = new Size(_maxChildWidthOrHeight, extentHeight);
flag = true;
CanScrollLeftOrUp = false;
CanScrollRightOrDown = false;
}
}
// 3) we can not fit all the children in the viewport, so now we will enable scrolling/virtualizing items
if (!flag)
{
_maxVisibleItems = (int)Math.Floor(_viewPort.Height / MinimumChildHeight); // calculate how many visible children we can show at once
double targetHeight = availableSize.Height / _maxVisibleItems; // calculate the new target width
FirstVisibleIndex = _firstVisibleIndex;
extentHeight = 0;
double top = 0;
for (int i = 0; i < _actualChildCount; i++)
{
extentHeight += targetHeight;
heights[i] = targetHeight;
_childRects[i] = new Rect(0, top, _maxChildWidthOrHeight, heights[i]);
top += heights[i];
}
_extent = new Size(_maxChildWidthOrHeight, extentHeight);
CanScrollLeftOrUp = LastVisibleIndex < _actualChildCount - 1;
CanScrollRightOrDown = FirstVisibleIndex > 0;
}
UIElementCollection children = this.InternalChildren;
IItemContainerGenerator generator = this.ItemContainerGenerator;
// Realize the visible items
GeneratorPosition pos = generator.GeneratorPositionFromIndex(FirstVisibleIndex);
int childIndex = (pos.Offset == 0) ? pos.Index : pos.Index + 1;
using (generator.StartAt(pos, GeneratorDirection.Forward, true))
{
for (int itemIndex = FirstVisibleIndex; itemIndex <= LastVisibleIndex; itemIndex++, ++childIndex)
{
bool newlyRealized = false;
UIElement child = generator.GenerateNext(out newlyRealized) as UIElement;
if (newlyRealized)
{
if (childIndex >= children.Count)
{
base.AddInternalChild(child);
}
else
{
base.InsertInternalChild(childIndex, child);
}
generator.PrepareItemContainer(child);
}
child.Measure(new Size(_maxChildWidthOrHeight, heights[itemIndex]));
}
}
// virtualize items that are no longer visible
CleanUpItems();
return(new Size(_maxChildWidthOrHeight, availableSize.Height));
}
public static FixedDocumentSequence GetDocumentSequence(object dataContext, Stream inputStream, Size paperSize)
{
//承载一个可移植、高保真、格式固定的文档。
FixedDocument _document = new FixedDocument();
//为高保真度、固定格式的页面提供内容。
FixedPage page = new FixedPage();
//高度
page.Height = paperSize.Height;
//宽度
page.Width = paperSize.Width;
//提供有关FixedDocument中的FixedPage元素的信息。
PageContent content = new PageContent();
//Child:获取或设置与此PageContent关联的FixedPage。
content.Child = page;
//属性Pages:获取文档的PageContent元素的集合。
//Add方法:向页集合中添加新页。
_document.Pages.Add(content);
FrameworkElement template = (FrameworkElement)XamlReader.Load(inputStream);
template.BeginInit();
template.DataContext = dataContext;
template.Measure(paperSize);
template.Arrange(new Rect(paperSize));
template.EndInit();
template.UpdateLayout();
page.Children.Add(template);
//构造一个基于内存的xps document 为什么？
MemoryStream ms = new MemoryStream();
//为XPS内容创建包
Package package = Package.Open(ms, FileMode.Create, FileAccess.ReadWrite);
//每个包都需要一个URI。形式:"pack:// syntax"
Uri documentUri = new Uri("pack://InMemoryDocument.xps");
PackageStore.RemovePackage(documentUri);
//加入该包
PackageStore.AddPackage(documentUri, package);
//基于该包创建XPS的XpsDocument对象
XpsDocument xpsDocument = new XpsDocument(package, CompressionOption.Fast, documentUri.AbsoluteUri);
//将flow document写入基于内存的xps document中去
XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(xpsDocument);
//分页
writer.Write(((IDocumentPaginatorSource)_document).DocumentPaginator);
//获取这个基于内存的xps document的fixed document
FixedDocumentSequence pages = xpsDocument.GetFixedDocumentSequence();
//关闭基于内存的xps document 关闭流以释放内存
xpsDocument.Close();
return(pages);
}