public HitTestMetrics[] HitTestTextRange(int textPosition, int textLength, float originX, float originY)
{
HitTestTextRange(textPosition, textLength, originX, originY, null, out int actualHitTestMetricsCount);
var hitTestMetrics = new HitTestMetrics[actualHitTestMetricsCount];
if (actualHitTestMetricsCount > 0)
{
HitTestTextRange(textPosition, textLength, originX, originY, hitTestMetrics, out _).CheckError();
}
return(hitTestMetrics);
}
public int GetCaretIndex(Point p)
{
SharpDX.Bool isTrailingHit;
SharpDX.Bool isInside;
HitTestMetrics result = this.DirectWriteTextLayout.HitTestPoint(
(float)p.X,
(float)p.Y,
out isTrailingHit,
out isInside);
return(result.TextPosition + (isTrailingHit ? 1 : 0));
}
/// <summary>
/// The application calls this function to get a set of hit-test metrics corresponding to a range of text positions.
/// One of the main usages is to implement highlight selection of the text string.
/// The function returns E_NOT_SUFFICIENT_BUFFER, which is equivalent to HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER),
/// when the buffer size of hitTestMetrics is too small to hold all the regions calculated by the function.
/// In this situation, the function sets the output value *actualHitTestMetricsCount to the number of geometries calculated.
/// The application is responsible for allocating a new buffer of greater size and calling the function again.
/// A good value to use as an initial value for maxHitTestMetricsCount may be calculated from the following equation:
/// maxHitTestMetricsCount = lineCount * maxBidiReorderingDepth where lineCount is obtained from the value of the output argument *actualLineCount (from the function IDWriteTextLayout::GetLineLengths), and the maxBidiReorderingDepth value from the DWRITE_TEXT_METRICS structure of the output argument *textMetrics (from the function IDWriteFactory::CreateTextLayout).
/// </summary>
/// <param name="textPosition">The first text position of the specified range. </param>
/// <param name="textLength">The number of positions of the specified range. </param>
/// <param name="originX">The origin pixel location X at the left of the layout box. This offset is added to the hit-test metrics returned. </param>
/// <param name="originY">The origin pixel location Y at the top of the layout box. This offset is added to the hit-test metrics returned. </param>
/// <returns>a reference to a buffer of the output geometry fully enclosing the specified position range. The buffer must be at least as large as maxHitTestMetricsCount. </returns>
/// <unmanaged>HRESULT IDWriteTextLayout::HitTestTextRange([None] int textPosition,[None] int textLength,[None] float originX,[None] float originY,[Out, Buffer, Optional] DWRITE_HIT_TEST_METRICS* hitTestMetrics,[None] int maxHitTestMetricsCount,[Out] int* actualHitTestMetricsCount)</unmanaged>
public HitTestMetrics[] HitTestTextRange(int textPosition, int textLength, float originX, float originY)
{
var hitTestMetrics = new HitTestMetrics[0];
int actualHitTestMetricsCount = 0;
HitTestTextRange(textPosition, textLength, originX, originY, hitTestMetrics, 0, out actualHitTestMetricsCount);
if (actualHitTestMetricsCount > 0)
{
hitTestMetrics = new HitTestMetrics[actualHitTestMetricsCount];
HitTestTextRange(textPosition, textLength, originX, originY, hitTestMetrics, actualHitTestMetricsCount,
out actualHitTestMetricsCount);
}
return(hitTestMetrics);
}
public int GetCaretIndex(FormattedText text, Point point, Size constraint)
{
using (TextLayout layout = GetTextLayout(this.factory, text, constraint))
{
SharpDX.Bool isTrailingHit;
SharpDX.Bool isInside;
HitTestMetrics result = layout.HitTestPoint(
(float)point.X,
(float)point.Y,
out isTrailingHit,
out isInside);
return(result.TextPosition + (isTrailingHit ? 1 : 0));
}
}
protected override void OnMouseClick(MouseEventArgs e)
{
base.OnMouseClick(e);
bool isTrailingHit;
bool isInside;
HitTestMetrics hitTestMetrics = this._textLayout.HitTestPoint(e.X, e.Y, out isTrailingHit, out isInside);
if (isInside)
{
bool underline = _textLayout.GetUnderline((int)hitTestMetrics.TextPosition);
_textLayout.SetUnderline(!underline, new TextRange((int)hitTestMetrics.TextPosition, 1));
Render();
}
}
/// <summary>
/// The application calls this function to get a set of hit-test metrics corresponding to a range of text positions.
/// One of the main usages is to implement highlight selection of the text string.
/// The function returns E_NOT_SUFFICIENT_BUFFER, which is equivalent to HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER),
/// when the buffer size of hitTestMetrics is too small to hold all the regions calculated by the function.
/// In this situation, the function sets the output value *actualHitTestMetricsCount to the number of geometries calculated.
/// The application is responsible for allocating a new buffer of greater size and calling the function again.
/// A good value to use as an initial value for maxHitTestMetricsCount may be calculated from the following equation:
/// maxHitTestMetricsCount = lineCount * maxBidiReorderingDepth where lineCount is obtained from the value of the output argument *actualLineCount (from the function IDWriteTextLayout::GetLineLengths), and the maxBidiReorderingDepth value from the DWRITE_TEXT_METRICS structure of the output argument *textMetrics (from the function IDWriteFactory::CreateTextLayout).
/// </summary>
/// <param name="textPosition">The first text position of the specified range. </param>
/// <param name="textLength">The number of positions of the specified range. </param>
/// <param name="originX">The origin pixel location X at the left of the layout box. This offset is added to the hit-test metrics returned. </param>
/// <param name="originY">The origin pixel location Y at the top of the layout box. This offset is added to the hit-test metrics returned. </param>
/// <returns>a reference to a buffer of the output geometry fully enclosing the specified position range. The buffer must be at least as large as maxHitTestMetricsCount. </returns>
/// <unmanaged>HRESULT IDWriteTextLayout::HitTestTextRange([None] int textPosition,[None] int textLength,[None] float originX,[None] float originY,[Out, Buffer, Optional] DWRITE_HIT_TEST_METRICS* hitTestMetrics,[None] int maxHitTestMetricsCount,[Out] int* actualHitTestMetricsCount)</unmanaged>
public HitTestMetrics[] HitTestTextRange(int textPosition, int textLength, float originX, float originY)
{
var hitTestMetrics = new HitTestMetrics[0];
int actualHitTestMetricsCount = 0;
HitTestTextRange(textPosition, textLength, originX, originY, hitTestMetrics, 0, out actualHitTestMetricsCount);
if (actualHitTestMetricsCount > 0)
{
hitTestMetrics = new HitTestMetrics[actualHitTestMetricsCount];
HitTestTextRange(textPosition, textLength, originX, originY, hitTestMetrics, actualHitTestMetricsCount,
out actualHitTestMetricsCount);
}
return hitTestMetrics;
}