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Find and Highlight Text Using UI Automation (http://msdn.microsoft.com/en-us/library/ms752287.aspx)
C#
///--------------------------------------------------------------------
/// <summary>
/// Starts the target application.
/// </summary>
/// <param name="app">
/// The application to start.
/// </param>
/// <returns>The automation element for the app main window.</returns>
/// <remarks>
/// Three WPF documents, a rich text document, and a plain text document
/// are provided in the Content folder of the TextProvider project.
/// </remarks>
///--------------------------------------------------------------------
private AutomationElement StartApp(string app)
{
// Start application.
Process p = Process.Start(app);
// Give the target application some time to start.
// For Win32 applications, WaitForInputIdle can be used instead.
// Another alternative is to listen for WindowOpened events.
// Otherwise, an ArgumentException results when you try to
// retrieve an automation element from the window handle.
Thread.Sleep(2000);
targetResult.Content =
WPFTarget +
" started. \n\nPlease load a document into the target " +
"application and click the 'Find edit control' button above. " +
"\n\nNOTE: Documents can be found in the 'Content' folder of the FindText project.";
targetResult.Background = Brushes.LightGreen;
// Return the automation element for the app main window.
return (AutomationElement.FromHandle(p.MainWindowHandle)) ;
}
...
///--------------------------------------------------------------------
/// <summary>
/// Finds the text control in our target.
/// </summary>
/// <param name="src">The object that raised the event.</param>
/// <param name="e">Event arguments.</param>
/// <remarks>
/// Initializes the TextPattern object and event handlers.
/// </remarks>
///--------------------------------------------------------------------
private void FindTextProvider_Click(object src, RoutedEventArgs e)
{
// Set up the conditions for finding the text control.
PropertyCondition documentControl = new PropertyCondition(
AutomationElement.ControlTypeProperty,
ControlType.Document);
PropertyCondition textPatternAvailable = new PropertyCondition(
AutomationElement.IsTextPatternAvailableProperty, true);
AndCondition findControl =
new AndCondition(documentControl, textPatternAvailable);
// Get the Automation Element for the first text control found.
// For the purposes of this sample it is sufficient to find the
// first text control. In other cases there may be multiple text
// controls to sort through.
targetDocument =
targetWindow.FindFirst(TreeScope.Descendants, findControl);
// Didn't find a text control.
if (targetDocument == null)
{
targetResult.Content =
WPFTarget +
" does not contain a Document control type.";
targetResult.Background = Brushes.Salmon;
startWPFTargetButton.IsEnabled = false;
return;
}
// Get required control patterns
targetTextPattern =
targetDocument.GetCurrentPattern(
TextPattern.Pattern) as TextPattern;
// Didn't find a text control that supports TextPattern.
if (targetTextPattern == null)
{
targetResult.Content =
WPFTarget +
" does not contain an element that supports TextPattern.";
targetResult.Background = Brushes.Salmon;
startWPFTargetButton.IsEnabled = false;
return;
}
// Text control is available so display the client controls.
infoGrid.Visibility = Visibility.Visible;
targetResult.Content =
"Text provider found.";
targetResult.Background = Brushes.LightGreen;
// Initialize the document range for the text of the document.
documentRange = targetTextPattern.DocumentRange;
// Initialize the client's search buttons.
if (targetTextPattern.DocumentRange.GetText(1).Length > 0)
{
searchForwardButton.IsEnabled = true;
}
// Initialize the client's search TextBox.
searchString.IsEnabled = true;
// Check if the text control supports text selection
if (targetTextPattern.SupportedTextSelection ==
SupportedTextSelection.None)
{
targetResult.Content = "Unable to select text.";
targetResult.Background = Brushes.Salmon;
return;
}
// Edit control found so remove the find button from the client.
findEditButton.Visibility = Visibility.Collapsed;
// Initialize the client with the current target selection, if any.
NotifySelectionChanged();
// Search starts at beginning of doc and goes forward
searchBackward = false;
// Initialize a text changed listener.
// An instance of TextPatternRange will become invalid if
// one of the following occurs:
// 1) The text in the provider changes via some user activity.
// 2) ValuePattern.SetValue is used to programatically change
// the value of the text in the provider.
// The only way the client application can detect if the text
// has changed (to ensure that the ranges are still valid),
// is by setting a listener for the TextChanged event of
// the TextPattern. If this event is raised, the client needs
// to update the targetDocumentRange member data to ensure the
// user is working with the updated text.
// Clients must always anticipate the possibility that the text
// can change underneath them.
Automation.AddAutomationEventHandler(
TextPattern.TextChangedEvent,
targetDocument,
TreeScope.Element,
TextChanged);
// Initialize a selection changed listener.
// The target selection is reflected in the client.
Automation.AddAutomationEventHandler(
TextPattern.TextSelectionChangedEvent,
targetDocument,
TreeScope.Element,
OnTextSelectionChange);
}
...
///--------------------------------------------------------------------
/// <summary>
/// Handles changes to the search text in the client.
/// </summary>
/// <param name="sender">The object that raised the event.</param>
/// <param name="e">Event arguments.</param>
/// <remarks>
/// Reset all controls if user changes search text
/// </remarks>
///--------------------------------------------------------------------
void SearchString_Change(object sender, TextChangedEventArgs e)
{
int startPoints = documentRange.CompareEndpoints(
TextPatternRangeEndpoint.Start,
searchRange,
TextPatternRangeEndpoint.Start);
int endPoints = documentRange.CompareEndpoints(
TextPatternRangeEndpoint.End,
searchRange,
TextPatternRangeEndpoint.End);
// If the starting endpoints of the document range and the search
// range are equivalent then we can search forward only since the
// search range is at the start of the document.
if (startPoints == 0)
{
searchForwardButton.IsEnabled = true;
searchBackwardButton.IsEnabled = false;
}
// If the ending endpoints of the document range and the search
// range are identical then we can search backward only since the
// search range is at the end of the document.
else if (endPoints == 0)
{
searchForwardButton.IsEnabled = false;
searchBackwardButton.IsEnabled = true;
}
// Otherwise we can search both directions.
else
{
searchForwardButton.IsEnabled = true;
searchBackwardButton.IsEnabled = true;
}
}
///--------------------------------------------------------------------
/// <summary>
/// Handles the Search button click.
/// </summary>
/// <param name="sender">The object that raised the event.</param>
/// <param name="e">Event arguments.</param>
/// <remarks>Find the text specified in the text box.</remarks>
///--------------------------------------------------------------------
void SearchDirection_Click(object sender, RoutedEventArgs e)
{
Button searchDirection = (Button)sender;
// Are we searching backward through the text control?
searchBackward =
((traversalDirection)searchDirection.Tag == traversalDirection.Backward);
// Check if search text entered
if (searchString.Text.Trim() == "")
{
targetResult.Content = "No search criteria.";
targetResult.Background = Brushes.Salmon;
return;
}
// Does target range support text selection?
if (targetTextPattern.SupportedTextSelection ==
SupportedTextSelection.None)
{
targetResult.Content = "Unable to select text.";
targetResult.Background = Brushes.Salmon;
return;
}
// Does target range support multiple selections?
if (targetTextPattern.SupportedTextSelection ==
SupportedTextSelection.Multiple)
{
targetResult.Content = "Multiple selections present.";
targetResult.Background = Brushes.Salmon;
return;
}
// Clone the document range since we modify the endpoints
// as we search.
TextPatternRange documentRangeClone = documentRange.Clone();
// Move the cloned document range endpoints to enable the
// selection of the next matching text range.
TextPatternRange[] selectionRange =
targetTextPattern.GetSelection();
if (selectionRange[0] != null)
{
if (searchBackward)
{
documentRangeClone.MoveEndpointByRange(
TextPatternRangeEndpoint.End,
selectionRange[0],
TextPatternRangeEndpoint.Start);
}
else
{
documentRangeClone.MoveEndpointByRange(
TextPatternRangeEndpoint.Start,
selectionRange[0],
TextPatternRangeEndpoint.End);
}
}
// Find the text specified in the Search textbox.
// Clone the search range since we need to modify it.
TextPatternRange searchRangeClone = searchRange.Clone();
// backward = false? -- search forward, otherwise backward.
// ignoreCase = false? -- search is case sensitive.
searchRange =
documentRangeClone.FindText(
searchString.Text, searchBackward, false);
// Search unsuccessful.
if (searchRange == null)
{
// Search string not found at all.
if (documentRangeClone.CompareEndpoints(
TextPatternRangeEndpoint.Start,
searchRangeClone,
TextPatternRangeEndpoint.Start) == 0)
{
targetResult.Content = "Text not found.";
targetResult.Background = Brushes.Wheat;
searchBackwardButton.IsEnabled = false;
searchForwardButton.IsEnabled = false;
}
// End of document (either the start or end of the document
// range depending on search direction) was reached before
// finding another occurence of the search string.
else
{
targetResult.Content = "End of document reached.";
targetResult.Background = Brushes.Wheat;
if (!searchBackward)
{
searchRangeClone.MoveEndpointByRange(
TextPatternRangeEndpoint.Start,
documentRange,
TextPatternRangeEndpoint.End);
searchBackwardButton.IsEnabled = true;
searchForwardButton.IsEnabled = false;
}
else
{
searchRangeClone.MoveEndpointByRange(
TextPatternRangeEndpoint.End,
documentRange,
TextPatternRangeEndpoint.Start);
searchBackwardButton.IsEnabled = false;
searchForwardButton.IsEnabled = true;
}
}
searchRange = searchRangeClone;
}
// The search string was found.
else
{
targetResult.Content = "Text found.";
targetResult.Background = Brushes.LightGreen;
}
searchRange.Select();
// Scroll the selection into view and align with top of viewport
searchRange.ScrollIntoView(true);
// The WPF target doesn't show selected text as highlighted unless
// the window has focus.
targetWindow.SetFocus();
}