public override void EnsureVisible()
{
if (!IsValuesCaretPresent && !IsAsciiCaretPresent)
{
return;
}
var line = ContainingHexViewLine;
if (line.VisibilityState != VSTF.VisibilityState.FullyVisible)
{
VSTE.ViewRelativePosition relativeTo;
var firstVisibleLine = hexView.HexViewLines?.FirstVisibleLine;
if (firstVisibleLine == null || !firstVisibleLine.IsVisible())
{
relativeTo = VSTE.ViewRelativePosition.Top;
}
else if (line.BufferStart <= firstVisibleLine.BufferStart)
{
relativeTo = VSTE.ViewRelativePosition.Top;
}
else
{
relativeTo = VSTE.ViewRelativePosition.Bottom;
}
hexView.DisplayHexLineContainingBufferPosition(line.BufferStart, 0, relativeTo);
}
double left, right, width;
switch (currentPosition.ActiveColumn)
{
case HexColumnType.Values:
left = hexCaretLayer.ValuesLeft;
right = hexCaretLayer.ValuesRight;
width = hexCaretLayer.ValuesWidth;
break;
case HexColumnType.Ascii:
left = hexCaretLayer.AsciiLeft;
right = hexCaretLayer.AsciiRight;
width = hexCaretLayer.AsciiWidth;
break;
case HexColumnType.Offset:
default:
throw new InvalidOperationException();
}
double availWidth = Math.Max(0, hexView.ViewportWidth - width);
double extraScroll;
if (availWidth >= WpfHexViewConstants.EXTRA_HORIZONTAL_WIDTH)
{
extraScroll = WpfHexViewConstants.EXTRA_HORIZONTAL_WIDTH;
}
else
{
extraScroll = availWidth / 2;
}
if (hexView.ViewportWidth == 0)
{
// Don't do anything if there's zero width. This can happen during
// startup when code accesses the caret before the window is shown.
}
else if (left < hexView.ViewportLeft)
{
hexView.ViewportLeft = left - extraScroll;
}
else if (right > hexView.ViewportRight)
{
hexView.ViewportLeft = right + extraScroll - hexView.ViewportWidth;
}
}
void OnScroll(ScrollDirection value, double xCoordinate)
{
HexViewLine line;
HexBufferPoint lineStart;
switch (value)
{
case ScrollDirection.Left:
line = wpfHexView.Caret.ContainingHexViewLine;
if (line.TextLeft >= wpfHexView.ViewportLeft)
{
StopScrolling();
}
else if (wpfHexView.Caret.Position.Position.ActivePosition.BufferPosition != line.BufferStart)
{
editorOperations.MoveToPreviousCharacter(true);
}
else
{
wpfHexView.ViewportLeft = line.TextLeft;
StopScrolling();
}
break;
case ScrollDirection.Right:
line = wpfHexView.Caret.ContainingHexViewLine;
if (line.TextRight <= wpfHexView.ViewportRight)
{
StopScrolling();
}
else if (wpfHexView.Caret.Position.Position.ActivePosition.BufferPosition < line.BufferEnd)
{
editorOperations.MoveToNextCharacter(true);
}
else
{
wpfHexView.ViewportLeft = Math.Max(0, line.TextRight - wpfHexView.ViewportWidth);
StopScrolling();
}
break;
case ScrollDirection.Up:
line = wpfHexView.HexViewLines.FirstVisibleLine;
if (line.VisibilityState == VSTF.VisibilityState.FullyVisible && !line.IsFirstDocumentLine())
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(line.BufferStart - 1);
}
lineStart = line.BufferStart;
if (line.VisibilityState != VSTF.VisibilityState.FullyVisible)
{
wpfHexView.DisplayHexLineContainingBufferPosition(line.BufferStart, 0, VSTE.ViewRelativePosition.Top);
}
if (!line.IsValid)
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(lineStart);
}
if (line.IsFirstDocumentLine())
{
StopScrolling();
}
editorOperations.MoveCaret(line, xCoordinate, true, hexMoveToFlags);
break;
case ScrollDirection.Down:
line = wpfHexView.HexViewLines.LastVisibleLine;
if (line.VisibilityState == VSTF.VisibilityState.FullyVisible && !line.IsLastDocumentLine())
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(line.BufferEnd);
}
lineStart = line.BufferStart;
if (line.VisibilityState != VSTF.VisibilityState.FullyVisible)
{
wpfHexView.DisplayHexLineContainingBufferPosition(line.BufferStart, 0, VSTE.ViewRelativePosition.Bottom);
}
if (!line.IsValid)
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(lineStart);
}
if (line.IsLastDocumentLine())
{
StopScrolling();
}
editorOperations.MoveCaret(line, xCoordinate, true, hexMoveToFlags);
break;
default:
throw new ArgumentOutOfRangeException(nameof(value));
}
wpfHexView.Caret.EnsureVisible();
}
