// Resize the text size with specified width and height
public void ResizeText(int width, int height)
{
ICharSequence text = new Java.Lang.String(Text);
// Do not resize if the view does not have dimensions or there is no text
if (text == null || text.Length() == 0 || height <= 0 || width <= 0 || mTextSize == 0)
{
return;
}
if (TransformationMethod != null)
{
text = TransformationMethod.GetTransformationFormatted(text, this);
}
// Get the text view's paint object
TextPaint textPaint = Paint;
// Store the current text size
float oldTextSize = textPaint.TextSize;
// If there is a max text size set, use the lesser of that and the default text size
float targetTextSize = mMaxTextSize > 0 ? Math.Min(mTextSize, mMaxTextSize) : mTextSize;
// Get the required text height
int textHeight = GetTextHeight(text, textPaint, width, targetTextSize);
// Until we either fit within our text view or we had reached our min text size, incrementally try smaller sizes
while (textHeight > height && targetTextSize > mMinTextSize)
{
targetTextSize = Math.Max(targetTextSize - 2, mMinTextSize);
textHeight = GetTextHeight(text, textPaint, width, targetTextSize);
}
// If we had reached our minimum text size and still don't fit, append an ellipsis
if (mAddEllipsis && targetTextSize == mMinTextSize && textHeight > height)
{
TextPaint paint = new TextPaint(textPaint);
// Draw using a static layout
StaticLayout layout = new StaticLayout(text, paint, width, Layout.Alignment.AlignNormal, mSpacingMult, mSpacingAdd, false);
// Check that we have a least one line of rendered text
if (layout.LineCount > 0)
{
// Since the line at the specific vertical position would be cut off,
// we must trim up to the previous line
int lastLine = layout.GetLineForVertical(height) - 1;
// If the text would not even fit on a single line, clear it
if (lastLine < 0)
{
Text = "";
}
// Otherwise, trim to the previous line and add an ellipsis
else
{
int start = layout.GetLineStart(lastLine);
int end = layout.GetLineEnd(lastLine);
float lineWidth = layout.GetLineWidth(lastLine);
float ellipseWidth = textPaint.MeasureText(mEllipsis);
// Trim characters off until we have enough room to draw the ellipsis
while (width < lineWidth + ellipseWidth)
{
lineWidth = textPaint.MeasureText(text.SubSequence(start, --end + 1).ToString());
}
Text = (text.SubSequence(0, end) + mEllipsis);
}
}
}
// Some devices try to auto adjust line spacing, so force default line spacing
// and invalidate the layout as a side effect
SetTextSize(ComplexUnitType.Px, targetTextSize);
SetLineSpacing(mSpacingAdd, mSpacingMult);
// Notify the listener if registered
if (mTextResizeListener != null)
{
mTextResizeListener.OnTextResize(this, oldTextSize, targetTextSize);
}
// Reset force resize flag
mNeedsResize = false;
}
public void ResizeText(int width, int height)
{
var text = TextFormatted;
if (text == null || text.Length() == 0 || height <= 0 || width <= 0 || mTextSize == 0)
{
return;
}
if (TransformationMethod != null)
{
text = TransformationMethod.GetTransformationFormatted(TextFormatted, this);
}
TextPaint textPaint = Paint;
float oldTextSize = textPaint.TextSize;
float targetTextSize = mMaxTextSize > 0 ? System.Math.Min(mTextSize, mMaxTextSize) : mTextSize;
int textHeight = GetTextHeight(text, textPaint, width, targetTextSize);
while (textHeight > height && targetTextSize > mMinTextSize)
{
targetTextSize = System.Math.Max(targetTextSize - 2, mMinTextSize);
textHeight = GetTextHeight(text, textPaint, width, targetTextSize);
}
if (AddEllipsis && targetTextSize == mMinTextSize && textHeight > height)
{
TextPaint paint = new TextPaint(textPaint);
StaticLayout layout = new StaticLayout(text, paint, width, Layout.Alignment.AlignNormal, mSpacingMult, mSpacingAdd, false);
if (layout.LineCount > 0)
{
int lastLine = layout.GetLineForVertical(height) - 1;
if (lastLine < 0)
{
SetText("", BufferType.Normal);
}
else
{
int start = layout.GetLineStart(lastLine);
int end = layout.GetLineEnd(lastLine);
float lineWidth = layout.GetLineWidth(lastLine);
float ellipseWidth = textPaint.MeasureText(mEllipsis);
while (width < lineWidth + ellipseWidth)
{
lineWidth = textPaint.MeasureText(text.SubSequence(start, --end + 1).ToString());
}
SetText(text.SubSequence(0, end) + mEllipsis, BufferType.Normal);
}
}
}
SetTextSize(ComplexUnitType.Px, targetTextSize);
SetLineSpacing(mSpacingAdd, mSpacingMult);
mTextResizeListener?.OnTextResize(this, oldTextSize, targetTextSize);
mNeedsResize = false;
}