/// <summary> /// Synchronizes the selection state held in this object with the selection state in MSHTML /// </summary> /// <returns>true if the selection has changed</returns> public bool SynchronizeSelection() { //Get the selection object from the MSHTML document if (_document == null) { _document = _editor.MSHTMLDocument; } Interop.IHTMLSelectionObject selectionObj = _document.GetSelection(); //Get the current selection from that selection object object currentSelection = null; try { currentSelection = selectionObj.CreateRange(); } catch { } ArrayList oldItems = _items; HtmlSelectionType oldType = _type; int oldLength = _selectionLength; //Default to an empty selection _type = HtmlSelectionType.Empty; _selectionLength = 0; if (currentSelection != null) { _mshtmlSelection = currentSelection; _items = new ArrayList(); //If it's a text selection if (currentSelection is Interop.IHTMLTxtRange) { Interop.IHTMLTxtRange textRange = (Interop.IHTMLTxtRange)currentSelection; //IntPtr ptr = Marshal.GetIUnknownForObject(textRange); Interop.IHTMLElement parentElement = textRange.ParentElement(); // If the document is in full document mode or we're selecting a non-body tag, allow it to select // otherwise, leave the selection as empty (since we don't want the body tag to be selectable on an ASP.NET // User Control if (IsSelectableElement(Element.GetWrapperFor(parentElement, _editor))) { //Add the parent of the text selection if (parentElement != null) { _text = textRange.GetText(); if (_text != null) { _selectionLength = _text.Length; } else { _selectionLength = 0; } _type = HtmlSelectionType.TextSelection; _items.Add(parentElement); } } } //If it's a control selection else if (currentSelection is Interop.IHtmlControlRange) { Interop.IHtmlControlRange controlRange = (Interop.IHtmlControlRange)currentSelection; int selectedCount = controlRange.GetLength(); //Add all elements selected if (selectedCount > 0) { _type = HtmlSelectionType.ElementSelection; for (int i = 0; i < selectedCount; i++) { Interop.IHTMLElement currentElement = controlRange.Item(i); _items.Add(currentElement); } _selectionLength = selectedCount; } } } _sameParentValid = false; bool selectionChanged = false; //Now check if there was a change of selection //If the two selections have different lengths, then the selection has changed if (_type != oldType) { selectionChanged = true; } else if (_selectionLength != oldLength) { selectionChanged = true; } else { if (_items != null) { //If the two selections have a different element, then the selection has changed for (int i = 0; i < _items.Count; i++) { if (_items[i] != oldItems[i]) { selectionChanged = true; break; } } } } if (selectionChanged) { //Set _elements to null so no one can retrieve a dirty copy of the selection element wrappers _elements = null; OnSelectionChanged(); return(true); } return(false); }
/// <summary> /// Finds the specified string in the content of the control and selects it if it exists /// </summary> /// <param name="searchString">The string to find</param> /// <param name="matchCase">Set to true to match casing of the string</param> /// <param name="wholeWord">Set to true to only find whole words</param> /// <returns></returns> public bool Find(string searchString, bool matchCase, bool wholeWord, bool searchUp) { Interop.IHTMLSelectionObject selectionObj = MSHTMLDocument.GetSelection(); // Check if a selection actually exists bool selectionExists = false; if (selectionObj != null) { selectionExists = selectionObj.GetSelectionType().Equals("Text"); } Interop.IHTMLTxtRange textRange = null; if (selectionExists) { object o = selectionObj.CreateRange(); textRange = o as Interop.IHTMLTxtRange; } if (textRange == null) { // If no selection exists, select the entire body Interop.IHtmlBodyElement bodyElement = MSHTMLDocument.GetBody() as Interop.IHtmlBodyElement; Debug.Assert(bodyElement != null, "Couldn't get body element in HtmlControl.Find"); selectionExists = false; textRange = bodyElement.createTextRange(); } // Set up the bounds of the search if (searchUp) { // If we're search up in the document if (selectionExists) { // If a selection exists, move the range's end to one character before the selection textRange.MoveEnd("character", -1); } // Move the range's beginning to the start of the document int temp = 1; while (temp == 1) { temp = textRange.MoveStart("textedit", -1); } } else { // If we're searching down in the document if (selectionExists) { // If a selection exists, start one char after the selection textRange.MoveStart("character", 1); } // Move the range's end to the end of the document int temp = 1; while (temp == 1) { temp = textRange.MoveEnd("textedit", 1); } } // Set up the flags for matching case and whole word search int flags = (matchCase ? 0x4 : 0) | (wholeWord ? 0x2 : 0); int direction = searchUp ? -10000000 : 10000000; //Do the search bool success = textRange.FindText(searchString, direction, flags); if (success) { // If we succeeded, select the text, scroll it into view, and we're done! textRange.Select(); textRange.ScrollIntoView(true); return(true); } else if (selectionExists) { // If we only searched a portion of the document // we need to wrap around the document... textRange = selectionObj.CreateRange() as Interop.IHTMLTxtRange; // Set up the bounds of the search if (searchUp) { // If we're searching up in the document // Start one char after the selection textRange.MoveStart("character", 1); // Move the range's end to the end of the document int temp = 1; while (temp == 1) { temp = textRange.MoveEnd("textedit", 1); } } else { // If we're searching down in the document // Move the range's end to one character before the selection textRange.MoveEnd("character", -1); // Move the range's beginning to the start of the document int temp = 1; while (temp == 1) { temp = textRange.MoveStart("textedit", -1); } } success = textRange.FindText(searchString, direction, flags); if (success) { // If we succeeded, select the text, scroll it into view, and we're done! textRange.Select(); textRange.ScrollIntoView(true); return(true); } } return(false); }