/// <summary>
/// Show context menu clicked on given rectangle.
/// </summary>
/// <param name="parent">the parent control to show the context menu on</param>
/// <param name="rect">the rectangle that was clicked to show context menu</param>
/// <param name="link">the link that was clicked to show context menu on</param>
public void ShowContextMenu(RControl parent, CssRect rect, CssBox link)
{
try
{
DisposeContextMenu();
_parentControl = parent;
_currentRect = rect;
_currentLink = link;
_contextMenu = _htmlContainer.Adapter.GetContextMenu();
if (rect != null)
{
bool isVideo = false;
if (link != null)
{
isVideo = link is CssBoxFrame && ((CssBoxFrame)link).IsVideo;
var linkExist = !string.IsNullOrEmpty(link.HrefLink);
_contextMenu.AddItem(isVideo ? _openVideo : _openLink, linkExist, OnOpenLinkClick);
if (_htmlContainer.IsSelectionEnabled)
{
_contextMenu.AddItem(isVideo ? _copyVideoUrl : _copyLink, linkExist, OnCopyLinkClick);
}
_contextMenu.AddDivider();
}
if (rect.IsImage && !isVideo)
{
_contextMenu.AddItem(_saveImage, rect.Image != null, OnSaveImageClick);
if (_htmlContainer.IsSelectionEnabled)
{
_contextMenu.AddItem(_copyImageLink, !string.IsNullOrEmpty(_currentRect.OwnerBox.GetAttribute("src")), OnCopyImageLinkClick);
_contextMenu.AddItem(_copyImage, rect.Image != null, OnCopyImageClick);
}
_contextMenu.AddDivider();
}
if (_htmlContainer.IsSelectionEnabled)
{
_contextMenu.AddItem(_copy, rect.Selected, OnCopyClick);
}
}
if (_htmlContainer.IsSelectionEnabled)
{
_contextMenu.AddItem(_selectAll, true, OnSelectAllClick);
}
if (_contextMenu.ItemsCount > 0)
{
_contextMenu.RemoveLastDivider();
_contextMenu.Show(parent, parent.MouseLocation);
}
}
catch (Exception ex)
{
_htmlContainer.ReportError(HtmlRenderErrorType.ContextMenu, "Failed to show context menu", ex);
}
}
/// <summary>
/// Dispose of the last used context menu.
/// </summary>
private void DisposeContextMenu()
{
try
{
if (_contextMenu != null)
_contextMenu.Dispose();
_contextMenu = null;
_parentControl = null;
_currentRect = null;
_currentLink = null;
}
catch
{ }
}
/// <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>
/// 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>
/// 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>
/// Start drag & drop operation on the currently selected html segment.
/// </summary>
/// <param name="control">the control to start the drag & 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>
/// 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>
/// On mouse leave change the cursor back to default.
/// </summary>
/// <param name="parent">the control hosting the html to set cursor and invalidate</param>
public void HandleMouseLeave(RControl parent)
{
if (_cursorChanged)
{
_cursorChanged = false;
parent.SetCursorDefault();
}
}
/// <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 mouse up to handle selection and link click.
/// </summary>
/// <param name="parent">the control hosting the html to invalidate</param>
/// <param name="leftMouseButton">is the left mouse button has been released</param>
/// <returns>is the mouse up should be ignored</returns>
public bool HandleMouseUp(RControl parent, bool leftMouseButton)
{
bool ignore = false;
_mouseDownInControl = false;
if (_root.HtmlContainer.IsSelectionEnabled)
{
ignore = _inSelection;
if (!_inSelection && leftMouseButton && _mouseDownOnSelectedWord)
{
ClearSelection();
parent.Invalidate();
}
_mouseDownOnSelectedWord = false;
_inSelection = false;
}
ignore = ignore || (DateTime.Now - _lastMouseDown > TimeSpan.FromSeconds(1));
return ignore;
}
/// <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>
/// Select all the words in the html.
/// </summary>
/// <param name="control">the control hosting the html to invalidate</param>
public void SelectAll(RControl control)
{
if (_root.HtmlContainer.IsSelectionEnabled)
{
ClearSelection();
SelectAllWords(_root);
control.Invalidate();
}
}
/// <summary>
/// Save the given image to file by showing save dialog to the client.
/// </summary>
/// <param name="image">the image to save</param>
/// <param name="name">the name of the image for save dialog</param>
/// <param name="extension">the extension of the image for save dialog</param>
/// <param name="control">optional: the control to show the dialog on</param>
protected virtual void SaveToFileInt(RImage image, string name, string extension, RControl control = null)
{
throw new NotImplementedException();
}
/// <summary>
/// Save the given image to file by showing save dialog to the client.<br/>
/// Not relevant for platforms that don't render HTML on UI element.
/// </summary>
/// <param name="image">the image to save</param>
/// <param name="name">the name of the image for save dialog</param>
/// <param name="extension">the extension of the image for save dialog</param>
/// <param name="control">optional: the control to show the dialog on</param>
public void SaveToFile(RImage image, string name, string extension, RControl control = null)
{
SaveToFileInt(image, name, extension, control);
}
/// <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);
