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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.TextFormatting;
using System.Windows.Navigation;
namespace Tango.Scripting.Editors.Rendering
{
/// <summary>
/// VisualLineElement that represents a piece of text and is a clickable link.
/// </summary>
public class VisualLineLinkText : VisualLineText
{
/// <summary>
/// Gets/Sets the URL that is navigated to when the link is clicked.
/// </summary>
public Uri NavigateUri { get; set; }
/// <summary>
/// Gets/Sets the window name where the URL will be opened.
/// </summary>
public string TargetName { get; set; }
/// <summary>
/// Gets/Sets whether the user needs to press Control to click the link.
/// The default value is true.
/// </summary>
public bool RequireControlModifierForClick { get; set; }
/// <summary>
/// Creates a visual line text element with the specified length.
/// It uses the <see cref="ITextRunConstructionContext.VisualLine"/> and its
/// <see cref="VisualLineElement.RelativeTextOffset"/> to find the actual text string.
/// </summary>
public VisualLineLinkText(VisualLine parentVisualLine, int length) : base(parentVisualLine, length)
{
this.RequireControlModifierForClick = true;
}
/// <inheritdoc/>
public override TextRun CreateTextRun(int startVisualColumn, ITextRunConstructionContext context)
{
this.TextRunProperties.SetForegroundBrush(context.TextView.LinkTextForegroundBrush);
this.TextRunProperties.SetBackgroundBrush(context.TextView.LinkTextBackgroundBrush);
this.TextRunProperties.SetTextDecorations(TextDecorations.Underline);
return base.CreateTextRun(startVisualColumn, context);
}
/// <summary>
/// Gets whether the link is currently clickable.
/// </summary>
/// <remarks>Returns true when control is pressed; or when
/// <see cref="RequireControlModifierForClick"/> is disabled.</remarks>
protected bool LinkIsClickable()
{
if (NavigateUri == null)
return false;
if (RequireControlModifierForClick)
return (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control;
else
return true;
}
/// <inheritdoc/>
protected internal override void OnQueryCursor(QueryCursorEventArgs e)
{
if (LinkIsClickable()) {
e.Handled = true;
e.Cursor = Cursors.Hand;
}
}
/// <inheritdoc/>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes",
Justification = "I've seen Process.Start throw undocumented exceptions when the mail client / web browser is installed incorrectly")]
protected internal override void OnMouseDown(MouseButtonEventArgs e)
{
if (e.ChangedButton == MouseButton.Left && !e.Handled && LinkIsClickable()) {
RequestNavigateEventArgs args = new RequestNavigateEventArgs(this.NavigateUri, this.TargetName);
args.RoutedEvent = Hyperlink.RequestNavigateEvent;
FrameworkElement element = e.Source as FrameworkElement;
if (element != null) {
// allow user code to handle the navigation request
element.RaiseEvent(args);
}
if (!args.Handled) {
try {
Process.Start(this.NavigateUri.ToString());
} catch {
// ignore all kinds of errors during web browser start
}
}
e.Handled = true;
}
}
/// <inheritdoc/>
protected override VisualLineText CreateInstance(int length)
{
return new VisualLineLinkText(ParentVisualLine, length) {
NavigateUri = this.NavigateUri,
TargetName = this.TargetName,
RequireControlModifierForClick = this.RequireControlModifierForClick
};
}
}
}
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