/// <summary>
/// Initializes a new instance of the <see cref="RRect" /> class with the specified location and size.
/// </summary>
/// <param name="location">A <see cref="RPoint" /> that represents the upper-left corner of the rectangular region.</param>
/// <param name="size">A <see cref="RSize" /> that represents the width and height of the rectangular region.</param>
public RRect(RPoint location, RSize size)
{
_x = location.X;
_y = location.Y;
_width = size.Width;
_height = size.Height;
}
/// <summary>
/// Check if the given location is inside the given box deep.<br/>
/// Check inner boxes and all lines that the given box spans to.
/// </summary>
/// <param name="box">the box to check</param>
/// <param name="location">the location to check</param>
/// <returns>true - location inside the box, false - otherwise</returns>
public static bool IsInBox(CssBox box, RPoint location)
{
foreach (var line in box.Rectangles)
{
if (line.Value.Contains(location))
return true;
}
foreach (var childBox in box.Boxes)
{
if (IsInBox(childBox, location))
return true;
}
return false;
}
/// <summary>
/// Measures the bounds of box and children, recursively.<br/>
/// Performs layout of the DOM structure creating lines by set bounds restrictions.
/// </summary>
/// <param name="g">Device context to use</param>
protected override void PerformLayoutImp(RGraphics g)
{
if (Display == CssConstants.None)
return;
RectanglesReset();
var prevSibling = DomUtils.GetPreviousSibling(this);
double left = ContainingBlock.Location.X + ContainingBlock.ActualPaddingLeft + ActualMarginLeft + ContainingBlock.ActualBorderLeftWidth;
double top = (prevSibling == null && ParentBox != null ? ParentBox.ClientTop : ParentBox == null ? Location.Y : 0) + MarginTopCollapse(prevSibling) + (prevSibling != null ? prevSibling.ActualBottom + prevSibling.ActualBorderBottomWidth : 0);
Location = new RPoint(left, top);
ActualBottom = top;
//width at 100% (or auto)
double minwidth = GetMinimumWidth();
double width = ContainingBlock.Size.Width
- ContainingBlock.ActualPaddingLeft - ContainingBlock.ActualPaddingRight
- ContainingBlock.ActualBorderLeftWidth - ContainingBlock.ActualBorderRightWidth
- ActualMarginLeft - ActualMarginRight - ActualBorderLeftWidth - ActualBorderRightWidth;
//Check width if not auto
if (Width != CssConstants.Auto && !string.IsNullOrEmpty(Width))
{
width = CssValueParser.ParseLength(Width, width, this);
}
if (width < minwidth || width >= 9999)
width = minwidth;
double height = ActualHeight;
if (height < 1)
{
height = Size.Height + ActualBorderTopWidth + ActualBorderBottomWidth;
}
if (height < 1)
{
height = 2;
}
if (height <= 2 && ActualBorderTopWidth < 1 && ActualBorderBottomWidth < 1)
{
BorderTopStyle = BorderBottomStyle = CssConstants.Solid;
BorderTopWidth = "1px";
BorderBottomWidth = "1px";
}
Size = new RSize(width, height);
ActualBottom = Location.Y + ActualPaddingTop + ActualPaddingBottom + height;
}
/// <summary>
/// Get css line box under the given sub-tree at the given y location or the nearest line from the top.<br/>
/// the location must be in correct scroll offset.
/// </summary>
/// <param name="box">the box to start search from</param>
/// <param name="location">the location to find the box at</param>
/// <returns>css word box if exists or null</returns>
public static CssLineBox GetCssLineBox(CssBox box, RPoint location)
{
CssLineBox line = null;
if (box != null)
{
if (box.LineBoxes.Count > 0)
{
if (box.HtmlTag == null || box.HtmlTag.Name != "td" || box.Bounds.Contains(location))
{
foreach (var lineBox in box.LineBoxes)
{
foreach (var rect in lineBox.Rectangles)
{
if (rect.Value.Top <= location.Y)
{
line = lineBox;
}
if (rect.Value.Top > location.Y)
{
return line;
}
}
}
}
}
foreach (var childBox in box.Boxes)
{
line = GetCssLineBox(childBox, location) ?? line;
}
}
return line;
}
/// <summary>
/// Translates a given <see cref="RPoint" /> by a specified
/// <see
/// cref="T:System.Drawing.SizeF" />
/// .
/// </summary>
/// <returns>
/// The translated <see cref="RPoint" />.
/// </returns>
/// <param name="pt">
/// The <see cref="RPoint" /> to translate.
/// </param>
/// <param name="sz">
/// The <see cref="T:System.Drawing.SizeF" /> that specifies the numbers to add to the coordinates of
/// <paramref
/// name="pt" />
/// .
/// </param>
public static RPoint Add(RPoint pt, RSize sz)
{
return new RPoint(pt.X + sz.Width, pt.Y + sz.Height);
}
/// <summary>
/// Adjusts the location of this rectangle by the specified amount.
/// </summary>
/// <param name="pos">The amount to offset the location. </param>
public void Offset(RPoint pos)
{
Offset(pos.X, pos.Y);
}
/// <summary> /// Draw the given string using the given font and foreground color at given location. /// </summary> /// <param name="str">the string to draw</param> /// <param name="font">the font to use to draw the string</param> /// <param name="color">the text color to set</param> /// <param name="point">the location to start string draw (top-left)</param> /// <param name="size">used to know the size of the rendered text for transparent text support</param> /// <param name="rtl">is to render the string right-to-left (true - RTL, false - LTR)</param> public abstract void DrawString(String str, RFont font, RColor color, RPoint point, RSize size, bool rtl);
/// <summary>
/// Initializes a new instance of the <see cref="RSize" /> structure from the specified <see cref="RPoint" /> structure.
/// </summary>
/// <param name="pt">The <see cref="RPoint" /> structure from which to initialize this <see cref="RSize" /> structure.</param>
public RSize(RPoint pt)
{
_width = pt.X;
_height = pt.Y;
}
/// <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>
/// Deeply offsets the top of the box and its contents
/// </summary>
/// <param name="amount"></param>
internal void OffsetTop(double amount)
{
List<CssLineBox> lines = new List<CssLineBox>();
foreach (CssLineBox line in Rectangles.Keys)
lines.Add(line);
foreach (CssLineBox line in lines)
{
RRect r = Rectangles[line];
Rectangles[line] = new RRect(r.X, r.Y + amount, r.Width, r.Height);
}
foreach (CssRect word in Words)
{
word.Top += amount;
}
foreach (CssBox b in Boxes)
{
b.OffsetTop(amount);
}
if (_listItemBox != null)
_listItemBox.OffsetTop(amount);
Location = new RPoint(Location.X, Location.Y + amount);
}
/// <summary>
/// Init.
/// </summary>
/// <param name="location">the location to scroll to</param>
public HtmlScrollEventArgs(RPoint location)
{
_location = location;
}
/// <summary>
/// Draw video image over the iframe if found.
/// </summary>
private void DrawImage(RGraphics g, RPoint offset, RRect rect)
{
if (_imageWord.Image != null)
{
if (rect.Width > 0 && rect.Height > 0)
{
if (_imageWord.ImageRectangle == RRect.Empty)
g.DrawImage(_imageWord.Image, rect);
else
g.DrawImage(_imageWord.Image, rect, _imageWord.ImageRectangle);
if (_imageWord.Selected)
{
g.DrawRectangle(GetSelectionBackBrush(g, true), _imageWord.Left + offset.X, _imageWord.Top + offset.Y, _imageWord.Width + 2, DomUtils.GetCssLineBoxByWord(_imageWord).LineHeight);
}
}
}
else if (_isVideo && !_imageLoadingComplete)
{
RenderUtils.DrawImageLoadingIcon(g, HtmlContainer, rect);
if (rect.Width > 19 && rect.Height > 19)
{
g.DrawRectangle(g.GetPen(RColor.LightGray), rect.X, rect.Y, rect.Width, rect.Height);
}
}
}
/// <summary> /// Show the context menu in the given parent control at the given location. /// </summary><param name="parent">the parent control to show in</param><param name="location">the location to show at relative to the parent control</param> public abstract void Show(RControl parent, RPoint location);
/// <summary>
/// Get css word box under the given sub-tree at the given x,y location.<br/>
/// the location must be in correct scroll offset.
/// </summary>
/// <param name="lineBox">the line box to search in</param>
/// <param name="location">the location to find the box at</param>
/// <returns>css word box if exists or null</returns>
public static CssRect GetCssBoxWord(CssLineBox lineBox, RPoint location)
{
foreach (var rects in lineBox.Rectangles)
{
foreach (var word in rects.Key.Words)
{
// add word spacing to word width so sentence won't have hols in it when moving the mouse
var rect = word.Rectangle;
rect.Width += word.OwnerBox.ActualWordSpacing;
if (rect.Contains(location))
{
return word;
}
}
}
return null;
}
/// <summary>
/// Get css word box under the given sub-tree at the given x,y location.<br/>
/// the location must be in correct scroll offset.
/// </summary>
/// <param name="box">the box to start search from</param>
/// <param name="location">the location to find the box at</param>
/// <returns>css word box if exists or null</returns>
public static CssRect GetCssBoxWord(CssBox box, RPoint location)
{
if (box != null && box.Visibility == CssConstants.Visible)
{
if (box.LineBoxes.Count > 0)
{
foreach (var lineBox in box.LineBoxes)
{
var wordBox = GetCssBoxWord(lineBox, location);
if (wordBox != null)
return wordBox;
}
}
if (box.ClientRectangle.IsEmpty || box.ClientRectangle.Contains(location))
{
foreach (var childBox in box.Boxes)
{
var foundWord = GetCssBoxWord(childBox, location);
if (foundWord != null)
{
return foundWord;
}
}
}
}
return null;
}
/// <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>
/// Calculate the character index and offset by characters for the given word and given offset.<br/>
/// <seealso cref="CalculateWordCharIndexAndOffset(RControl,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>
/// Paint all the words in the box.
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="offset">the current scroll offset to offset the words</param>
private void PaintWords(RGraphics g, RPoint offset)
{
if (Width.Length > 0)
{
var isRtl = Direction == CssConstants.Rtl;
foreach (var word in Words)
{
if (!word.IsLineBreak)
{
var wordPoint = new RPoint(word.Left + offset.X, word.Top + offset.Y);
if (word.Selected)
{
// handle paint selected word background and with partial word selection
var wordLine = DomUtils.GetCssLineBoxByWord(word);
var left = word.SelectedStartOffset > -1 ? word.SelectedStartOffset : (wordLine.Words[0] != word && word.HasSpaceBefore ? -ActualWordSpacing : 0);
var padWordRight = word.HasSpaceAfter && !wordLine.IsLastSelectedWord(word);
var width = word.SelectedEndOffset > -1 ? word.SelectedEndOffset : word.Width + (padWordRight ? ActualWordSpacing : 0);
var rect = new RRect(word.Left + offset.X + left, word.Top + offset.Y, width - left, wordLine.LineHeight);
g.DrawRectangle(GetSelectionBackBrush(g, false), rect.X, rect.Y, rect.Width, rect.Height);
if (HtmlContainer.SelectionForeColor != RColor.Empty && (word.SelectedStartOffset > 0 || word.SelectedEndIndexOffset > -1))
{
g.PushClipExclude(rect);
g.DrawString(word.Text, ActualFont, ActualColor, wordPoint, new RSize(word.Width, word.Height), isRtl);
g.PopClip();
g.PushClip(rect);
g.DrawString(word.Text, ActualFont, GetSelectionForeBrush(), wordPoint, new RSize(word.Width, word.Height), isRtl);
g.PopClip();
}
else
{
g.DrawString(word.Text, ActualFont, GetSelectionForeBrush(), wordPoint, new RSize(word.Width, word.Height), isRtl);
}
}
else
{
// g.DrawRectangle(HtmlContainer.Adapter.GetPen(RColor.Black), wordPoint.X, wordPoint.Y, word.Width - 1, word.Height - 1);
g.DrawString(word.Text, ActualFont, ActualColor, wordPoint, new RSize(word.Width, word.Height), isRtl);
}
}
}
}
}
/// <summary>
/// Set rectangle for inset/outset border as it need diagonal connection to other borders.
/// </summary>
/// <param name="border">Desired border</param>
/// <param name="b">Box which the border corresponds</param>
/// <param name="r">the rectangle the border is enclosing</param>
/// <param name="isLineStart">Specifies if the border is for a starting line (no bevel on left)</param>
/// <param name="isLineEnd">Specifies if the border is for an ending line (no bevel on right)</param>
/// <returns>Beveled border path, null if there is no rounded corners</returns>
private static void SetInOutsetRectanglePoints(Border border, CssBox b, RRect r, bool isLineStart, bool isLineEnd)
{
switch (border)
{
case Border.Top:
_borderPts[0] = new RPoint(r.Left, r.Top);
_borderPts[1] = new RPoint(r.Right, r.Top);
_borderPts[2] = new RPoint(r.Right, r.Top + b.ActualBorderTopWidth);
_borderPts[3] = new RPoint(r.Left, r.Top + b.ActualBorderTopWidth);
if (isLineEnd)
_borderPts[2].X -= b.ActualBorderRightWidth;
if (isLineStart)
_borderPts[3].X += b.ActualBorderLeftWidth;
break;
case Border.Right:
_borderPts[0] = new RPoint(r.Right - b.ActualBorderRightWidth, r.Top + b.ActualBorderTopWidth);
_borderPts[1] = new RPoint(r.Right, r.Top);
_borderPts[2] = new RPoint(r.Right, r.Bottom);
_borderPts[3] = new RPoint(r.Right - b.ActualBorderRightWidth, r.Bottom - b.ActualBorderBottomWidth);
break;
case Border.Bottom:
_borderPts[0] = new RPoint(r.Left, r.Bottom - b.ActualBorderBottomWidth);
_borderPts[1] = new RPoint(r.Right, r.Bottom - b.ActualBorderBottomWidth);
_borderPts[2] = new RPoint(r.Right, r.Bottom);
_borderPts[3] = new RPoint(r.Left, r.Bottom);
if (isLineStart)
_borderPts[0].X += b.ActualBorderLeftWidth;
if (isLineEnd)
_borderPts[1].X -= b.ActualBorderRightWidth;
break;
case Border.Left:
_borderPts[0] = new RPoint(r.Left, r.Top);
_borderPts[1] = new RPoint(r.Left + b.ActualBorderLeftWidth, r.Top + b.ActualBorderTopWidth);
_borderPts[2] = new RPoint(r.Left + b.ActualBorderLeftWidth, r.Bottom - b.ActualBorderBottomWidth);
_borderPts[3] = new RPoint(r.Left, r.Bottom);
break;
}
}
/// <summary>
/// Measures the bounds of box and children, recursively.<br/>
/// Performs layout of the DOM structure creating lines by set bounds restrictions.<br/>
/// </summary>
/// <param name="g">Device context to use</param>
protected virtual void PerformLayoutImp(RGraphics g)
{
if (Display != CssConstants.None)
{
RectanglesReset();
MeasureWordsSize(g);
}
if (IsBlock || Display == CssConstants.ListItem || Display == CssConstants.Table || Display == CssConstants.InlineTable || Display == CssConstants.TableCell)
{
// Because their width and height are set by CssTable
if (Display != CssConstants.TableCell && Display != CssConstants.Table)
{
double width = ContainingBlock.Size.Width
- ContainingBlock.ActualPaddingLeft - ContainingBlock.ActualPaddingRight
- ContainingBlock.ActualBorderLeftWidth - ContainingBlock.ActualBorderRightWidth;
if (Width != CssConstants.Auto && !string.IsNullOrEmpty(Width))
{
width = CssValueParser.ParseLength(Width, width, this);
}
Size = new RSize(width, Size.Height);
// must be separate because the margin can be calculated by percentage of the width
Size = new RSize(width - ActualMarginLeft - ActualMarginRight, Size.Height);
}
if (Display != CssConstants.TableCell)
{
var prevSibling = DomUtils.GetPreviousSibling(this);
double left = ContainingBlock.Location.X + ContainingBlock.ActualPaddingLeft + ActualMarginLeft + ContainingBlock.ActualBorderLeftWidth;
double top = (prevSibling == null && ParentBox != null ? ParentBox.ClientTop : ParentBox == null ? Location.Y : 0) + MarginTopCollapse(prevSibling) + (prevSibling != null ? prevSibling.ActualBottom + prevSibling.ActualBorderBottomWidth : 0);
Location = new RPoint(left, top);
ActualBottom = top;
}
//If we're talking about a table here..
if (Display == CssConstants.Table || Display == CssConstants.InlineTable)
{
CssLayoutEngineTable.PerformLayout(g, this);
}
else
{
//If there's just inline boxes, create LineBoxes
if (DomUtils.ContainsInlinesOnly(this))
{
ActualBottom = Location.Y;
CssLayoutEngine.CreateLineBoxes(g, this); //This will automatically set the bottom of this block
}
else if (_boxes.Count > 0)
{
foreach (var childBox in Boxes)
{
childBox.PerformLayout(g);
}
ActualRight = CalculateActualRight();
ActualBottom = MarginBottomCollapse();
}
}
}
else
{
var prevSibling = DomUtils.GetPreviousSibling(this);
if (prevSibling != null)
{
if (Location == RPoint.Empty)
Location = prevSibling.Location;
ActualBottom = prevSibling.ActualBottom;
}
}
ActualBottom = Math.Max(ActualBottom, Location.Y + ActualHeight);
CreateListItemBox(g);
var actualWidth = Math.Max(GetMinimumWidth() + GetWidthMarginDeep(this), Size.Width < 90999 ? ActualRight - HtmlContainer.Root.Location.X : 0);
HtmlContainer.ActualSize = CommonUtils.Max(HtmlContainer.ActualSize, new RSize(actualWidth, ActualBottom - HtmlContainer.Root.Location.Y));
}
/// <summary> /// Get TextureBrush object that uses the specified image and bounding rectangle. /// </summary> /// <param name="image">The Image object with which this TextureBrush object fills interiors.</param> /// <param name="dstRect">A Rectangle structure that represents the bounding rectangle for this TextureBrush object.</param> /// <param name="translateTransformLocation">The dimension by which to translate the transformation</param> public abstract RBrush GetTextureBrush(RImage image, RRect dstRect, RPoint translateTransformLocation);
/// <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> /// Fills the interior of a polygon defined by an array of points specified by Point structures. /// </summary> /// <param name="brush">Brush that determines the characteristics of the fill. </param> /// <param name="points">Array of Point structures that represent the vertices of the polygon to fill. </param> public abstract void DrawPolygon(RBrush brush, RPoint[] points);
/// <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>
/// Determines if the specified point is contained within this <see cref="RRect" /> structure.
/// </summary>
/// <returns>
/// This method returns true if the point represented by the <paramref name="pt" /> parameter is contained within this
/// <see cref="RRect" />
/// structure; otherwise false.
/// </returns>
/// <param name="pt">The <see cref="RPoint" /> to test.</param>
public bool Contains(RPoint pt)
{
return Contains(pt.X, pt.Y);
}
/// <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();
}
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();
}
else if (_cursorChanged)
{
parent.SetCursorDefault();
}
}
}
/// <summary>
/// Clear the current selection.
/// </summary>
public 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>
/// 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>
/// Translates a <see cref="RPoint" /> by the negative of a specified size.
/// </summary>
/// <returns>
/// The translated <see cref="RPoint" />.
/// </returns>
/// <param name="pt">
/// The <see cref="RPoint" /> to translate.
/// </param>
/// <param name="sz">
/// The <see cref="T:System.Drawing.SizeF" /> that specifies the numbers to subtract from the coordinates of
/// <paramref
/// name="pt" />
/// .
/// </param>
public static RPoint Subtract(RPoint pt, RSize sz)
{
return new RPoint(pt.X - sz.Width, pt.Y - sz.Height);
}
/// <summary>
/// Get css link box under the given sub-tree at the given x,y location.<br/>
/// the location must be in correct scroll offset.
/// </summary>
/// <param name="box">the box to start search from</param>
/// <param name="location">the location to find the box by</param>
/// <returns>css link box if exists or null</returns>
public static CssBox GetLinkBox(CssBox box, RPoint location)
{
if (box != null)
{
if (box.IsClickable && box.Visibility == CssConstants.Visible)
{
if (IsInBox(box, location))
return box;
}
if (box.ClientRectangle.IsEmpty || box.ClientRectangle.Contains(location))
{
foreach (var childBox in box.Boxes)
{
var foundBox = GetLinkBox(childBox, location);
if (foundBox != null)
return foundBox;
}
}
}
return null;
}