private void OnScrollViewerMouseMove(object sender, MouseEventArgs e)
{
// When "scrollViewer.CaptureMouse()" is called, mouse-move event will be
// sent before "CaptureMouse" returns. So if this event is sent due to the
// mouse being captured, then we won't process it at all.
//
if (false != ignoreMouseMoveEvent)
{
return;
}
IScriptObject activeScript = Solution.Current.ActiveScript;
if (activeScript == null)
{
return; // There's no active script just yet.
}
if (IsMouseInClickableRegion(sender, e) == false)
{
return;
}
// Retreive the coordinates of the mouse move event. Note that we always
// want the mouse coordinates relative to the top-left corner of the canvas
// instead of the scroll viewer (whose top coordinates are off if scroll
// offset is not at the top of the view).
//
CharPosition cursor = activeScript.CreateCharPosition();
System.Windows.Point screenPoint = GetRelativeCanvasPosition(e);
cursor.SetScreenPosition(screenPoint.X, screenPoint.Y);
mouseCharacterPosition = cursor.GetCharacterPosition();
if (-1 == clickedLineIndex)
{
if (textCore.InternalDragSourceExists == false)
{
// There is nothing being dragged right now.
textCore.SetMouseMovePosition(mouseCharacterPosition.X, mouseCharacterPosition.Y, e);
}
else
{
// Stop caret blinking while dragging.
textCanvas.PauseCaretTimer(true);
DragDrop.AddDragOverHandler(scrollViewer, OnDragOver);
DragDrop.AddDropHandler(scrollViewer, OnDrop);
try
{
string textToMove = textCore.SelectionText;
textToMove = textToMove.Replace("\n", "\r\n");
// Beginning the modal loop of "DoDragDrop" will immediately trigger
// a mouse-mvoe event before it returns (e.g. drop has been made or
// cancelled). So here we set the "ignoreMouseMoveEvent" to true and
// ignore the immediate mouse event from being processed (which will
// result in yet another "DoDragDrop" being called, causing two drop
// operations).
//
ignoreMouseMoveEvent = true;
DragDrop.DoDragDrop(textCanvas, textToMove, DragDropEffects.All);
ignoreMouseMoveEvent = false;
}
finally
{
DragDrop.RemoveDragOverHandler(scrollViewer, OnDragOver);
DragDrop.RemoveDropHandler(scrollViewer, OnDrop);
textCore.ClearDragDropState();
textCanvas.PauseCaretTimer(false); // Resume caret blinking...
}
}
// We turn the cursor to an arrow if it is within the breakpoint or line
// column, and I-beam otherwise. Clicking on the breakpoint column triggers
// a breakpoint and clicking on the line column selects the entire line.
//
scrollViewer.Cursor = Cursors.Arrow;
if (!IsPointWithinLineColumn(screenPoint))
{
if (!IsPointWithinBreakColumn(GetRelativeCanvasPosition(e)))
{
if (!textCore.IsPointInSelection(mouseCharacterPosition.X, mouseCharacterPosition.Y))
{
scrollViewer.Cursor = Cursors.IBeam;
}
}
}
if (textCore.ReadOnlyState && (false != TextCanvasHasKeyboardFocus))
{
if (inspectionToolTipTimer == null)
{
inspectionToolTipTimer = new DispatcherTimer();
inspectionToolTipTimer.Tick += new EventHandler(OnInspectionToolTipTimerTick);
// One has to hover over a word for 3/4ths of a second to be considered
// a valid 'Mouse Hover'. Yes, this is decided spontaneously.
inspectionToolTipTimer.Interval = new TimeSpan(0, 0, 0, 0, 200);
}
// Restart timer as cursor moves.
inspectionToolTipTimer.Stop();
inspectionToolTipTimer.Start();
}
}
else
{
scrollViewer.Cursor = Cursors.Arrow;
int currentLine = mouseCharacterPosition.Y;
textCore.SelectLines(clickedLineIndex, currentLine - clickedLineIndex);
}
if ((e.LeftButton & MouseButtonState.Pressed) != 0)
{
// If this message is sent by dragging a thumb on a scrollbar, then the
// user wishes to scroll the text canvas, in which case we should not force
// to bring the caret into view (which is what 'UpdateCaretPosition' does).
//
if ((e.OriginalSource as Thumb) == null)
{
UpdateCaretPosition();
}
}
}