/// <summary>
/// Handle mouse move to handle hover cursor and text selection.
/// </summary>
/// <param name="parent">the control hosting the html to set cursor and invalidate</param>
/// <param name="loc">the location of the mouse on the html</param>
public void HandleMouseMove(RControl parent, RPoint loc)
{
if (_root.HtmlContainer.IsSelectionEnabled && _mouseDownInControl && parent.LeftMouseButton)
{
if (_mouseDownOnSelectedWord)
{
// make sure not to start drag-drop on click but when it actually moves as it f***s mouse-up
if ((DateTime.Now - _lastMouseDown).TotalMilliseconds > 200)
{
StartDragDrop(parent);
}
}
else
{
HandleSelection(parent, loc, !_isDoubleClickSelect);
_inSelection = _selectionStart != null && _selectionEnd != null && (_selectionStart != _selectionEnd || _selectionStartIndex != _selectionEndIndex);
}
}
else
{
// Handle mouse hover over the html to change the cursor depending if hovering word, link of other.
var link = DomUtils.GetLinkBox(_root, loc);
if (link != null)
{
_cursorChanged = true;
parent.SetCursorHand();
if (link != _lastLink)
{
_root.HtmlContainer.HandleLinkHover(parent, loc, link);
_lastLink = link;
}
}
else if (_root.HtmlContainer.IsSelectionEnabled)
{
var word = DomUtils.GetCssBoxWord(_root, loc);
_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));
if (_cursorChanged)
{
parent.SetCursorIBeam();
}
else
{
parent.SetCursorDefault();
}
_lastLink = null;
}
else if (_cursorChanged)
{
parent.SetCursorDefault();
_lastLink = null;
}
}
}
/// <summary>
/// Select the word at the given location if found.
/// </summary>
/// <param name="control">the control hosting the html to invalidate</param>
/// <param name="loc">the location to select word at</param>
public void SelectWord(RControl control, RPoint loc)
{
if (_root.HtmlContainer.IsSelectionEnabled)
{
var word = DomUtils.GetCssBoxWord(_root, loc);
if (word != null)
{
word.Selection = this;
_selectionStartPoint = loc;
_selectionStart = _selectionEnd = word;
control.Invalidate();
}
}
}
/// <summary>
/// Handle mouse down to handle selection.
/// </summary>
/// <param name="parent">the control hosting the html to invalidate</param>
/// <param name="loc">the location of the mouse on the html</param>
/// <param name="isMouseInContainer"> </param>
public void HandleMouseDown(RControl parent, RPoint loc, bool isMouseInContainer)
{
bool clear = !isMouseInContainer;
if (isMouseInContainer)
{
_mouseDownInControl = true;
_isDoubleClickSelect = (DateTime.Now - _lastMouseDown).TotalMilliseconds < 400;
_lastMouseDown = DateTime.Now;
_mouseDownOnSelectedWord = false;
if (_root.HtmlContainer.IsSelectionEnabled && parent.LeftMouseButton)
{
var word = DomUtils.GetCssBoxWord(_root, loc);
if (word != null && word.Selected)
{
_mouseDownOnSelectedWord = true;
}
else
{
clear = true;
}
}
else if (parent.RightMouseButton)
{
var rect = DomUtils.GetCssBoxWord(_root, loc);
var link = DomUtils.GetLinkBox(_root, loc);
if (_root.HtmlContainer.IsContextMenuEnabled)
{
_contextMenuHandler.ShowContextMenu(parent, rect, link);
}
clear = rect == null || !rect.Selected;
}
}
if (clear)
{
ClearSelection();
parent.Invalidate();
}
}
/// <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();
}
}
}
