693 lines
28 KiB
C#
693 lines
28 KiB
C#
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// "Therefore those skilled at the unorthodox
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// are infinite as heaven and earth,
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// inexhaustible as the great rivers.
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// When they come to an end,
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// they begin again,
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// like the days and months;
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// they die and are reborn,
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// like the four seasons."
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//
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// - Sun Tsu,
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// "The Art of War"
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using System;
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using TheArtOfDev.HtmlRenderer.Adapters;
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using TheArtOfDev.HtmlRenderer.Adapters.Entities;
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using TheArtOfDev.HtmlRenderer.Core.Dom;
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using TheArtOfDev.HtmlRenderer.Core.Entities;
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using TheArtOfDev.HtmlRenderer.Core.Utils;
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namespace TheArtOfDev.HtmlRenderer.Core.Handlers
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{
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/// <summary>
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/// Handler for text selection in the html.
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/// </summary>
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internal sealed class SelectionHandler : IDisposable
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{
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#region Fields and Consts
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/// <summary>
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/// the root of the handled html tree
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/// </summary>
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private readonly CssBox _root;
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/// <summary>
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/// handler for showing context menu on right click
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/// </summary>
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private readonly ContextMenuHandler _contextMenuHandler;
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/// <summary>
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/// the mouse location when selection started used to ignore small selections
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/// </summary>
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private RPoint _selectionStartPoint;
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/// <summary>
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/// the starting word of html selection<br/>
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/// where the user started the selection, if the selection is backwards then it will be the last selected word.
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/// </summary>
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private CssRect _selectionStart;
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/// <summary>
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/// the ending word of html selection<br/>
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/// where the user ended the selection, if the selection is backwards then it will be the first selected word.
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/// </summary>
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private CssRect _selectionEnd;
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/// <summary>
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/// the selection start index if the first selected word is partially selected (-1 if not selected or fully selected)
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/// </summary>
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private int _selectionStartIndex = -1;
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/// <summary>
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/// the selection end index if the last selected word is partially selected (-1 if not selected or fully selected)
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/// </summary>
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private int _selectionEndIndex = -1;
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/// <summary>
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/// the selection start offset if the first selected word is partially selected (-1 if not selected or fully selected)
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/// </summary>
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private double _selectionStartOffset = -1;
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/// <summary>
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/// the selection end offset if the last selected word is partially selected (-1 if not selected or fully selected)
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/// </summary>
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private double _selectionEndOffset = -1;
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/// <summary>
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/// is the selection goes backward in the html, the starting word comes after the ending word in DFS traversing.<br/>
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/// </summary>
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private bool _backwardSelection;
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/// <summary>
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/// used to ignore mouse up after selection
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/// </summary>
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private bool _inSelection;
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/// <summary>
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/// current selection process is after double click (full word selection)
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/// </summary>
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private bool _isDoubleClickSelect;
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/// <summary>
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/// used to know if selection is in the control or started outside so it needs to be ignored
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/// </summary>
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private bool _mouseDownInControl;
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/// <summary>
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/// used to handle drag and drop
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/// </summary>
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private bool _mouseDownOnSelectedWord;
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/// <summary>
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/// is the cursor on the control has been changed by the selection handler
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/// </summary>
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private bool _cursorChanged;
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/// <summary>
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/// used to know if double click selection is requested
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/// </summary>
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private DateTime _lastMouseDown;
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/// <summary>
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/// used to know if drag and drop was already started not to execute the same operation over
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/// </summary>
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private object _dragDropData;
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#endregion
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/// <summary>
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/// Init.
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/// </summary>
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/// <param name="root">the root of the handled html tree</param>
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public SelectionHandler(CssBox root)
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{
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ArgChecker.AssertArgNotNull(root, "root");
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_root = root;
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_contextMenuHandler = new ContextMenuHandler(this, root.HtmlContainer);
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}
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/// <summary>
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/// Select all the words in the html.
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/// </summary>
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/// <param name="control">the control hosting the html to invalidate</param>
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public void SelectAll(RControl control)
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{
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if (_root.HtmlContainer.IsSelectionEnabled)
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{
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ClearSelection();
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SelectAllWords(_root);
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control.Invalidate();
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}
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}
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/// <summary>
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/// Select the word at the given location if found.
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/// </summary>
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/// <param name="control">the control hosting the html to invalidate</param>
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/// <param name="loc">the location to select word at</param>
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public void SelectWord(RControl control, RPoint loc)
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{
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if (_root.HtmlContainer.IsSelectionEnabled)
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{
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var word = DomUtils.GetCssBoxWord(_root, loc);
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if (word != null)
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{
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word.Selection = this;
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_selectionStartPoint = loc;
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_selectionStart = _selectionEnd = word;
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control.Invalidate();
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}
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}
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}
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/// <summary>
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/// Handle mouse down to handle selection.
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/// </summary>
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/// <param name="parent">the control hosting the html to invalidate</param>
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/// <param name="loc">the location of the mouse on the html</param>
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/// <param name="isMouseInContainer"> </param>
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public void HandleMouseDown(RControl parent, RPoint loc, bool isMouseInContainer)
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{
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bool clear = !isMouseInContainer;
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if (isMouseInContainer)
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{
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_mouseDownInControl = true;
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_isDoubleClickSelect = (DateTime.Now - _lastMouseDown).TotalMilliseconds < 400;
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_lastMouseDown = DateTime.Now;
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_mouseDownOnSelectedWord = false;
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if (_root.HtmlContainer.IsSelectionEnabled && parent.LeftMouseButton)
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{
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var word = DomUtils.GetCssBoxWord(_root, loc);
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if (word != null && word.Selected)
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{
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_mouseDownOnSelectedWord = true;
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}
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else
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{
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clear = true;
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}
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}
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else if (parent.RightMouseButton)
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{
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var rect = DomUtils.GetCssBoxWord(_root, loc);
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var link = DomUtils.GetLinkBox(_root, loc);
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if (_root.HtmlContainer.IsContextMenuEnabled)
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{
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_contextMenuHandler.ShowContextMenu(parent, rect, link);
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}
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clear = rect == null || !rect.Selected;
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}
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}
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if (clear)
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{
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ClearSelection();
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parent.Invalidate();
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}
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}
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/// <summary>
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/// Handle mouse up to handle selection and link click.
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/// </summary>
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/// <param name="parent">the control hosting the html to invalidate</param>
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/// <param name="leftMouseButton">is the left mouse button has been released</param>
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/// <returns>is the mouse up should be ignored</returns>
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public bool HandleMouseUp(RControl parent, bool leftMouseButton)
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{
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bool ignore = false;
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_mouseDownInControl = false;
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if (_root.HtmlContainer.IsSelectionEnabled)
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{
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ignore = _inSelection;
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if (!_inSelection && leftMouseButton && _mouseDownOnSelectedWord)
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{
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ClearSelection();
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parent.Invalidate();
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}
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_mouseDownOnSelectedWord = false;
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_inSelection = false;
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}
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ignore = ignore || (DateTime.Now - _lastMouseDown > TimeSpan.FromSeconds(1));
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return ignore;
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}
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/// <summary>
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/// Handle mouse move to handle hover cursor and text selection.
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/// </summary>
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/// <param name="parent">the control hosting the html to set cursor and invalidate</param>
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/// <param name="loc">the location of the mouse on the html</param>
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public void HandleMouseMove(RControl parent, RPoint loc)
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{
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if (_root.HtmlContainer.IsSelectionEnabled && _mouseDownInControl && parent.LeftMouseButton)
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{
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if (_mouseDownOnSelectedWord)
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{
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// make sure not to start drag-drop on click but when it actually moves as it fucks mouse-up
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if ((DateTime.Now - _lastMouseDown).TotalMilliseconds > 200)
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StartDragDrop(parent);
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}
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else
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{
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HandleSelection(parent, loc, !_isDoubleClickSelect);
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_inSelection = _selectionStart != null && _selectionEnd != null && (_selectionStart != _selectionEnd || _selectionStartIndex != _selectionEndIndex);
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}
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}
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else
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{
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// Handle mouse hover over the html to change the cursor depending if hovering word, link of other.
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var link = DomUtils.GetLinkBox(_root, loc);
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if (link != null)
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{
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_cursorChanged = true;
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parent.SetCursorHand();
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}
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else if (_root.HtmlContainer.IsSelectionEnabled)
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{
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var word = DomUtils.GetCssBoxWord(_root, loc);
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_cursorChanged = word != null && !word.IsImage && !(word.Selected && (word.SelectedStartIndex < 0 || word.Left + word.SelectedStartOffset <= loc.X) && (word.SelectedEndOffset < 0 || word.Left + word.SelectedEndOffset >= loc.X));
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if (_cursorChanged)
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parent.SetCursorIBeam();
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else
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parent.SetCursorDefault();
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}
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else if (_cursorChanged)
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{
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parent.SetCursorDefault();
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}
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}
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}
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/// <summary>
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/// On mouse leave change the cursor back to default.
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/// </summary>
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/// <param name="parent">the control hosting the html to set cursor and invalidate</param>
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public void HandleMouseLeave(RControl parent)
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{
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if (_cursorChanged)
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{
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_cursorChanged = false;
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parent.SetCursorDefault();
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}
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}
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/// <summary>
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/// Copy the currently selected html segment to clipboard.<br/>
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/// Copy rich html text and plain text.
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/// </summary>
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public void CopySelectedHtml()
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{
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if (_root.HtmlContainer.IsSelectionEnabled)
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{
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var html = DomUtils.GenerateHtml(_root, HtmlGenerationStyle.Inline, true);
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var plainText = DomUtils.GetSelectedPlainText(_root);
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if (!string.IsNullOrEmpty(plainText))
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_root.HtmlContainer.Adapter.SetToClipboard(html, plainText);
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}
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}
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/// <summary>
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/// Get the currently selected text segment in the html.<br/>
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/// </summary>
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public string GetSelectedText()
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{
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return _root.HtmlContainer.IsSelectionEnabled ? DomUtils.GetSelectedPlainText(_root) : null;
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}
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/// <summary>
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/// Copy the currently selected html segment with style.<br/>
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/// </summary>
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public string GetSelectedHtml()
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{
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return _root.HtmlContainer.IsSelectionEnabled ? DomUtils.GenerateHtml(_root, HtmlGenerationStyle.Inline, true) : null;
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}
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/// <summary>
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/// The selection start index if the first selected word is partially selected (-1 if not selected or fully selected)<br/>
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/// if the given word is not starting or ending selection word -1 is returned as full word selection is in place.
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/// </summary>
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/// <remarks>
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/// Handles backward selecting by returning the selection end data instead of start.
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/// </remarks>
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/// <param name="word">the word to return the selection start index for</param>
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/// <returns>data value or -1 if not applicable</returns>
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public int GetSelectingStartIndex(CssRect word)
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{
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return word == (_backwardSelection ? _selectionEnd : _selectionStart) ? (_backwardSelection ? _selectionEndIndex : _selectionStartIndex) : -1;
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}
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/// <summary>
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/// The selection end index if the last selected word is partially selected (-1 if not selected or fully selected)<br/>
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/// if the given word is not starting or ending selection word -1 is returned as full word selection is in place.
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/// </summary>
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/// <remarks>
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/// Handles backward selecting by returning the selection end data instead of start.
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/// </remarks>
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/// <param name="word">the word to return the selection end index for</param>
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public int GetSelectedEndIndexOffset(CssRect word)
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{
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return word == (_backwardSelection ? _selectionStart : _selectionEnd) ? (_backwardSelection ? _selectionStartIndex : _selectionEndIndex) : -1;
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}
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/// <summary>
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/// The selection start offset if the first selected word is partially selected (-1 if not selected or fully selected)<br/>
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/// if the given word is not starting or ending selection word -1 is returned as full word selection is in place.
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/// </summary>
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/// <remarks>
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/// Handles backward selecting by returning the selection end data instead of start.
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/// </remarks>
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/// <param name="word">the word to return the selection start offset for</param>
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public double GetSelectedStartOffset(CssRect word)
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{
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return word == (_backwardSelection ? _selectionEnd : _selectionStart) ? (_backwardSelection ? _selectionEndOffset : _selectionStartOffset) : -1;
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}
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/// <summary>
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/// The selection end offset if the last selected word is partially selected (-1 if not selected or fully selected)<br/>
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/// if the given word is not starting or ending selection word -1 is returned as full word selection is in place.
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/// </summary>
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/// <remarks>
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/// Handles backward selecting by returning the selection end data instead of start.
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/// </remarks>
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/// <param name="word">the word to return the selection end offset for</param>
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public double GetSelectedEndOffset(CssRect word)
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{
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return word == (_backwardSelection ? _selectionStart : _selectionEnd) ? (_backwardSelection ? _selectionStartOffset : _selectionEndOffset) : -1;
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
|
||
|
|
/// <filterpriority>2</filterpriority>
|
||
|
|
public void Dispose()
|
||
|
|
{
|
||
|
|
_contextMenuHandler.Dispose();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#region Private methods
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Handle html text selection by mouse move over the html with left mouse button pressed.<br/>
|
||
|
|
/// Calculate the words in the selected range and set their selected property.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="control">the control hosting the html to invalidate</param>
|
||
|
|
/// <param name="loc">the mouse location</param>
|
||
|
|
/// <param name="allowPartialSelect">true - partial word selection allowed, false - only full words selection</param>
|
||
|
|
private void HandleSelection(RControl control, RPoint loc, bool allowPartialSelect)
|
||
|
|
{
|
||
|
|
// get the line under the mouse or nearest from the top
|
||
|
|
var lineBox = DomUtils.GetCssLineBox(_root, loc);
|
||
|
|
if (lineBox != null)
|
||
|
|
{
|
||
|
|
// get the word under the mouse
|
||
|
|
var word = DomUtils.GetCssBoxWord(lineBox, loc);
|
||
|
|
|
||
|
|
// if no word found under the mouse use the last or the first word in the line
|
||
|
|
if (word == null && lineBox.Words.Count > 0)
|
||
|
|
{
|
||
|
|
if (loc.Y > lineBox.LineBottom)
|
||
|
|
{
|
||
|
|
// under the line
|
||
|
|
word = lineBox.Words[lineBox.Words.Count - 1];
|
||
|
|
}
|
||
|
|
else if (loc.X < lineBox.Words[0].Left)
|
||
|
|
{
|
||
|
|
// before the line
|
||
|
|
word = lineBox.Words[0];
|
||
|
|
}
|
||
|
|
else if (loc.X > lineBox.Words[lineBox.Words.Count - 1].Right)
|
||
|
|
{
|
||
|
|
// at the end of the line
|
||
|
|
word = lineBox.Words[lineBox.Words.Count - 1];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// if there is matching word
|
||
|
|
if (word != null)
|
||
|
|
{
|
||
|
|
if (_selectionStart == null)
|
||
|
|
{
|
||
|
|
// on start set the selection start word
|
||
|
|
_selectionStartPoint = loc;
|
||
|
|
_selectionStart = word;
|
||
|
|
if (allowPartialSelect)
|
||
|
|
CalculateWordCharIndexAndOffset(control, word, loc, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
// always set selection end word
|
||
|
|
_selectionEnd = word;
|
||
|
|
if (allowPartialSelect)
|
||
|
|
CalculateWordCharIndexAndOffset(control, word, loc, false);
|
||
|
|
|
||
|
|
ClearSelection(_root);
|
||
|
|
if (CheckNonEmptySelection(loc, allowPartialSelect))
|
||
|
|
{
|
||
|
|
CheckSelectionDirection();
|
||
|
|
SelectWordsInRange(_root, _backwardSelection ? _selectionEnd : _selectionStart, _backwardSelection ? _selectionStart : _selectionEnd);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_selectionEnd = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
_cursorChanged = true;
|
||
|
|
control.SetCursorIBeam();
|
||
|
|
control.Invalidate();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Clear the current selection.
|
||
|
|
/// </summary>
|
||
|
|
private void ClearSelection()
|
||
|
|
{
|
||
|
|
// clear drag and drop
|
||
|
|
_dragDropData = null;
|
||
|
|
|
||
|
|
ClearSelection(_root);
|
||
|
|
|
||
|
|
_selectionStartOffset = -1;
|
||
|
|
_selectionStartIndex = -1;
|
||
|
|
_selectionEndOffset = -1;
|
||
|
|
_selectionEndIndex = -1;
|
||
|
|
|
||
|
|
_selectionStartPoint = RPoint.Empty;
|
||
|
|
_selectionStart = null;
|
||
|
|
_selectionEnd = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Clear the selection from all the words in the css box recursively.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="box">the css box to selectionStart clear at</param>
|
||
|
|
private static void ClearSelection(CssBox box)
|
||
|
|
{
|
||
|
|
foreach (var word in box.Words)
|
||
|
|
{
|
||
|
|
word.Selection = null;
|
||
|
|
}
|
||
|
|
foreach (var childBox in box.Boxes)
|
||
|
|
{
|
||
|
|
ClearSelection(childBox);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Start drag and drop operation on the currently selected html segment.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="control">the control to start the drag and drop on</param>
|
||
|
|
private void StartDragDrop(RControl control)
|
||
|
|
{
|
||
|
|
if (_dragDropData == null)
|
||
|
|
{
|
||
|
|
var html = DomUtils.GenerateHtml(_root, HtmlGenerationStyle.Inline, true);
|
||
|
|
var plainText = DomUtils.GetSelectedPlainText(_root);
|
||
|
|
_dragDropData = control.Adapter.GetClipboardDataObject(html, plainText);
|
||
|
|
}
|
||
|
|
control.DoDragDropCopy(_dragDropData);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Select all the words that are under <paramref name="box"/> DOM hierarchy.<br/>
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="box">the box to start select all at</param>
|
||
|
|
public void SelectAllWords(CssBox box)
|
||
|
|
{
|
||
|
|
foreach (var word in box.Words)
|
||
|
|
{
|
||
|
|
word.Selection = this;
|
||
|
|
}
|
||
|
|
|
||
|
|
foreach (var childBox in box.Boxes)
|
||
|
|
{
|
||
|
|
SelectAllWords(childBox);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Check if the current selection is non empty, has some selection data.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="loc"></param>
|
||
|
|
/// <param name="allowPartialSelect">true - partial word selection allowed, false - only full words selection</param>
|
||
|
|
/// <returns>true - is non empty selection, false - empty selection</returns>
|
||
|
|
private bool CheckNonEmptySelection(RPoint loc, bool allowPartialSelect)
|
||
|
|
{
|
||
|
|
// full word selection is never empty
|
||
|
|
if (!allowPartialSelect)
|
||
|
|
return true;
|
||
|
|
|
||
|
|
// if end selection location is near starting location then the selection is empty
|
||
|
|
if (Math.Abs(_selectionStartPoint.X - loc.X) <= 1 && Math.Abs(_selectionStartPoint.Y - loc.Y) < 5)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
// selection is empty if on same word and same index
|
||
|
|
return _selectionStart != _selectionEnd || _selectionStartIndex != _selectionEndIndex;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Select all the words that are between <paramref name="selectionStart"/> word and <paramref name="selectionEnd"/> word in the DOM hierarchy.<br/>
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="root">the root of the DOM sub-tree the selection is in</param>
|
||
|
|
/// <param name="selectionStart">selection start word limit</param>
|
||
|
|
/// <param name="selectionEnd">selection end word limit</param>
|
||
|
|
private void SelectWordsInRange(CssBox root, CssRect selectionStart, CssRect selectionEnd)
|
||
|
|
{
|
||
|
|
bool inSelection = false;
|
||
|
|
SelectWordsInRange(root, selectionStart, selectionEnd, ref inSelection);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Select all the words that are between <paramref name="selectionStart"/> word and <paramref name="selectionEnd"/> word in the DOM hierarchy.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="box">the current traversal node</param>
|
||
|
|
/// <param name="selectionStart">selection start word limit</param>
|
||
|
|
/// <param name="selectionEnd">selection end word limit</param>
|
||
|
|
/// <param name="inSelection">used to know the traversal is currently in selected range</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private bool SelectWordsInRange(CssBox box, CssRect selectionStart, CssRect selectionEnd, ref bool inSelection)
|
||
|
|
{
|
||
|
|
foreach (var boxWord in box.Words)
|
||
|
|
{
|
||
|
|
if (!inSelection && boxWord == selectionStart)
|
||
|
|
{
|
||
|
|
inSelection = true;
|
||
|
|
}
|
||
|
|
if (inSelection)
|
||
|
|
{
|
||
|
|
boxWord.Selection = this;
|
||
|
|
|
||
|
|
if (selectionStart == selectionEnd || boxWord == selectionEnd)
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
foreach (var childBox in box.Boxes)
|
||
|
|
{
|
||
|
|
if (SelectWordsInRange(childBox, selectionStart, selectionEnd, ref inSelection))
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Calculate the character index and offset by characters for the given word and given offset.<br/>
|
||
|
|
/// <seealso cref="CalculateWordCharIndexAndOffset(RControl,HtmlRenderer.Core.Dom.CssRect,RPoint,bool)"/>.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="control">used to create graphics to measure string</param>
|
||
|
|
/// <param name="word">the word to calculate its index and offset</param>
|
||
|
|
/// <param name="loc">the location to calculate for</param>
|
||
|
|
/// <param name="selectionStart">to set the starting or ending char and offset data</param>
|
||
|
|
private void CalculateWordCharIndexAndOffset(RControl control, CssRect word, RPoint loc, bool selectionStart)
|
||
|
|
{
|
||
|
|
int selectionIndex;
|
||
|
|
double selectionOffset;
|
||
|
|
CalculateWordCharIndexAndOffset(control, word, loc, selectionStart, out selectionIndex, out selectionOffset);
|
||
|
|
|
||
|
|
if (selectionStart)
|
||
|
|
{
|
||
|
|
_selectionStartIndex = selectionIndex;
|
||
|
|
_selectionStartOffset = selectionOffset;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_selectionEndIndex = selectionIndex;
|
||
|
|
_selectionEndOffset = selectionOffset;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Calculate the character index and offset by characters for the given word and given offset.<br/>
|
||
|
|
/// If the location is below the word line then set the selection to the end.<br/>
|
||
|
|
/// If the location is to the right of the word then set the selection to the end.<br/>
|
||
|
|
/// If the offset is to the left of the word set the selection to the beginning.<br/>
|
||
|
|
/// Otherwise calculate the width of each substring to find the char the location is on.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="control">used to create graphics to measure string</param>
|
||
|
|
/// <param name="word">the word to calculate its index and offset</param>
|
||
|
|
/// <param name="loc">the location to calculate for</param>
|
||
|
|
/// <param name="inclusive">is to include the first character in the calculation</param>
|
||
|
|
/// <param name="selectionIndex">return the index of the char under the location</param>
|
||
|
|
/// <param name="selectionOffset">return the offset of the char under the location</param>
|
||
|
|
private static void CalculateWordCharIndexAndOffset(RControl control, CssRect word, RPoint loc, bool inclusive, out int selectionIndex, out double selectionOffset)
|
||
|
|
{
|
||
|
|
selectionIndex = 0;
|
||
|
|
selectionOffset = 0f;
|
||
|
|
var offset = loc.X - word.Left;
|
||
|
|
if (word.Text == null)
|
||
|
|
{
|
||
|
|
// not a text word - set full selection
|
||
|
|
selectionIndex = -1;
|
||
|
|
selectionOffset = -1;
|
||
|
|
}
|
||
|
|
else if (offset > word.Width - word.OwnerBox.ActualWordSpacing || loc.Y > DomUtils.GetCssLineBoxByWord(word).LineBottom)
|
||
|
|
{
|
||
|
|
// mouse under the line, to the right of the word - set to the end of the word
|
||
|
|
selectionIndex = word.Text.Length;
|
||
|
|
selectionOffset = word.Width;
|
||
|
|
}
|
||
|
|
else if (offset > 0)
|
||
|
|
{
|
||
|
|
// calculate partial word selection
|
||
|
|
int charFit;
|
||
|
|
double charFitWidth;
|
||
|
|
var maxWidth = offset + (inclusive ? 0 : 1.5f * word.LeftGlyphPadding);
|
||
|
|
control.MeasureString(word.Text, word.OwnerBox.ActualFont, maxWidth, out charFit, out charFitWidth);
|
||
|
|
|
||
|
|
selectionIndex = charFit;
|
||
|
|
selectionOffset = charFitWidth;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Check if the selection direction is forward or backward.<br/>
|
||
|
|
/// Is the selection start word is before the selection end word in DFS traversal.
|
||
|
|
/// </summary>
|
||
|
|
private void CheckSelectionDirection()
|
||
|
|
{
|
||
|
|
if (_selectionStart == _selectionEnd)
|
||
|
|
{
|
||
|
|
_backwardSelection = _selectionStartIndex > _selectionEndIndex;
|
||
|
|
}
|
||
|
|
else if (DomUtils.GetCssLineBoxByWord(_selectionStart) == DomUtils.GetCssLineBoxByWord(_selectionEnd))
|
||
|
|
{
|
||
|
|
_backwardSelection = _selectionStart.Left > _selectionEnd.Left;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_backwardSelection = _selectionStart.Top >= _selectionEnd.Bottom;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
}
|
||
|
|
}
|