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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.Activities.Core.Presentation
{
using System.Activities.Presentation;
using System.Activities.Presentation.FreeFormEditing;
using System.Activities.Presentation.View;
using System.Collections.Generic;
using System.Diagnostics;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Runtime;
internal class FlowchartConnectionPointsAdorner : ConnectionPointsAdorner
{
private bool isTextRightToLeft;
public FlowchartConnectionPointsAdorner(UIElement adornedElement, List<ConnectionPoint> connectionPointsToShow, bool isParentShapeSelected, bool isTextRightToLeft)
: base(adornedElement, connectionPointsToShow, isParentShapeSelected)
{
this.isTextRightToLeft = isTextRightToLeft;
this.FlowDirection = isTextRightToLeft ? FlowDirection.RightToLeft : FlowDirection.LeftToRight;
}
protected override void OnRender(DrawingContext drawingContext)
{
const int textCulture = 9;
ConnectionPoint trueConnectionPoint = null;
ConnectionPoint falseConnectionPoint = null;
if (this.connectionPoints.Contains(FlowchartDesigner.GetTrueConnectionPoint(this.AdornedElement)))
{
trueConnectionPoint = FlowchartDesigner.GetTrueConnectionPoint(this.AdornedElement);
}
if (this.connectionPoints.Contains(FlowchartDesigner.GetFalseConnectionPoint(this.AdornedElement)))
{
falseConnectionPoint = FlowchartDesigner.GetFalseConnectionPoint(this.AdornedElement);
}
Point actualPoint;
Point origin = FreeFormPanel.GetLocation(AdornedElement);
Thickness margin = ((FrameworkElement)AdornedElement).Margin;
origin.X += margin.Left;
origin.Y += margin.Top;
foreach (ConnectionPoint connPoint in this.connectionPoints)
{
actualPoint = new Point(connPoint.Location.X - origin.X, connPoint.Location.Y - origin.Y);
this.DrawConnectionPoint(connPoint, actualPoint, drawingContext);
}
if (trueConnectionPoint != null)
{
string trueLabelText = String.Empty;
VirtualizedContainerService.VirtualizingContainer virtualizingContainer = (VirtualizedContainerService.VirtualizingContainer)trueConnectionPoint.ParentDesigner;
if (virtualizingContainer != null && virtualizingContainer.ModelItem != null)
{
trueLabelText = (string)virtualizingContainer.ModelItem.Properties["TrueLabel"].ComputedValue;
}
actualPoint = new Point(trueConnectionPoint.Location.X - origin.X, trueConnectionPoint.Location.Y - origin.Y);
FormattedText trueMarkerFormattedText = new FormattedText(trueLabelText, new System.Globalization.CultureInfo(textCulture),
this.FlowDirection, FlowchartDesigner.FlowElementCaptionTypeface, FlowchartDesigner.FlowNodeCaptionFontSize,
new SolidColorBrush(WorkflowDesignerColors.WorkflowViewElementCaptionColor));
actualPoint.Y += ConnectionPoint.DrawingLargeSide / 2;
actualPoint.X -= trueMarkerFormattedText.WidthIncludingTrailingWhitespace;
DrawtWithTransform(
drawingContext,
this.isTextRightToLeft,
// Mirror the left side text to the right side by using this axis when RTL.
actualPoint.X,
() =>
{
drawingContext.DrawText(trueMarkerFormattedText, actualPoint);
});
}
if (falseConnectionPoint != null)
{
string falseLabelText = String.Empty;
VirtualizedContainerService.VirtualizingContainer virtualizingContainer = (VirtualizedContainerService.VirtualizingContainer)falseConnectionPoint.ParentDesigner;
if (virtualizingContainer != null && virtualizingContainer.ModelItem != null)
{
falseLabelText = (string)virtualizingContainer.ModelItem.Properties["FalseLabel"].ComputedValue;
}
actualPoint = new Point(falseConnectionPoint.Location.X - origin.X, falseConnectionPoint.Location.Y - origin.Y);
actualPoint.Y += ConnectionPoint.DrawingLargeSide / 2;
FormattedText falseMarkerFormattedText = new FormattedText(falseLabelText, new System.Globalization.CultureInfo(textCulture),
this.FlowDirection, FlowchartDesigner.FlowElementCaptionTypeface, FlowchartDesigner.FlowNodeCaptionFontSize,
new SolidColorBrush(WorkflowDesignerColors.WorkflowViewElementCaptionColor));
DrawtWithTransform(
drawingContext,
this.isTextRightToLeft,
// Mirror the left side text to the right side by using this axis when RTL.
actualPoint.X,
() =>
{
drawingContext.DrawText(falseMarkerFormattedText, actualPoint);
});
}
base.OnRender(drawingContext);
}
private static void DrawtWithTransform(DrawingContext drawingContext, bool isRightToLeft, double axis, Action doDraw)
{
if (isRightToLeft)
{
/* We hope to mirror the Text using yAxis as axis, like from (a) to (b)
* | |
* | ==>= =>==> | <==<= =<==
* |--------|------> x |----------|--------> x
* y axis (a) y axis (b)
*
* So we do it in three steps:
* 1) move text so that axis and y are coincident
* | |
* | ==>= =>==> ==>=|=>==>
* |--------|------> x ----------|---------> x
* y axis y(axis)
*
* 2) mirror
* | |
* ==>=|=>==> <=<=|=<==
* --------|------> x ----------|---------> x
* y(axis) y(axis)
*
* 3) move back
* | |
* <=<=|=<== | <=<= =<==
* --------|------> x |---------|----------> x
* y y axis
*
*
* | 1 0 0 | | -1 0 0 | | 1 0 0 | | -1 0 0 |
* transform = | 0 1 0 | x | 0 1 0 | x | 0 1 0 | = | 0 1 0 |
* | axis 0 1 | | 0 0 1 | | -axis 0 0 | | 2*axis 0 1 |
*/
MatrixTransform transform = new MatrixTransform(-1, 0, 0, 1, 2 * axis, 0);
drawingContext.PushTransform(transform);
doDraw();
drawingContext.Pop();
}
else
{
doDraw();
}
}
}
}
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