/// <summary>
/// Move the selection end to the buffer offset physically below
/// the current selection end.
/// </summary>
/// <remarks>
/// Move the selection end to the buffer offset physically below
/// the current selection end.
/// </remarks>
public static bool extendDown(android.text.Spannable text, android.text.Layout layout
)
{
int end = getSelectionEnd(text);
int line = layout.getLineForOffset(end);
if (line < layout.getLineCount() - 1)
{
int move;
if (layout.getParagraphDirection(line) == layout.getParagraphDirection(line + 1))
{
float h = layout.getPrimaryHorizontal(end);
move = layout.getOffsetForHorizontal(line + 1, h);
}
else
{
move = layout.getLineStart(line + 1);
}
extendSelection(text, move);
return(true);
}
else
{
if (end != text.Length)
{
extendSelection(text, text.Length);
return(true);
}
}
return(true);
}
protected internal override void onMeasure(int widthMeasureSpec, int heightMeasureSpec
)
{
base.onMeasure(widthMeasureSpec, heightMeasureSpec);
android.text.Layout layout_1 = getLayout();
if (layout_1 != null)
{
int lineCount = layout_1.getLineCount();
if (lineCount > 0)
{
int ellipsisCount = layout_1.getEllipsisCount(lineCount - 1);
if (ellipsisCount > 0)
{
setSingleLine(false);
setMaxLines(2);
android.content.res.TypedArray a = mContext.obtainStyledAttributes(null, android.R
.styleable.TextAppearance, android.R.attr.textAppearanceMedium, android.R.style.
TextAppearance_Medium);
int textSize = a.getDimensionPixelSize(android.R.styleable.TextAppearance_textSize
, 0);
if (textSize != 0)
{
// textSize is already expressed in pixels
setTextSize(android.util.TypedValue.COMPLEX_UNIT_PX, textSize);
}
a.recycle();
base.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
}
}
/// <summary>Performs a scroll to bottom action.</summary>
/// <remarks>
/// Performs a scroll to bottom action.
/// Scrolls to the bottom of the document.
/// </remarks>
/// <param name="widget">The text view.</param>
/// <param name="buffer">The text buffer.</param>
/// <returns>True if the event was handled.</returns>
/// <hide></hide>
protected internal virtual bool scrollBottom(android.widget.TextView widget, android.text.Spannable
buffer)
{
android.text.Layout layout = widget.getLayout();
int lineCount = layout.getLineCount();
if (getBottomLine(widget) <= lineCount - 1)
{
android.text.method.Touch.scrollTo(widget, layout, widget.getScrollX(), layout.getLineTop
(lineCount) - getInnerHeight(widget));
return true;
}
return false;
}
/// <summary>Performs a scroll page up action.</summary>
/// <remarks>
/// Performs a scroll page up action.
/// Scrolls down by one page.
/// </remarks>
/// <param name="widget">The text view.</param>
/// <param name="buffer">The text buffer.</param>
/// <returns>True if the event was handled.</returns>
/// <hide></hide>
protected internal virtual bool scrollPageDown(android.widget.TextView widget, android.text.Spannable
buffer)
{
android.text.Layout layout = widget.getLayout();
int innerHeight = getInnerHeight(widget);
int bottom_1 = widget.getScrollY() + innerHeight + innerHeight;
int bottomLine = layout.getLineForVertical(bottom_1);
if (bottomLine <= layout.getLineCount() - 1)
{
android.text.method.Touch.scrollTo(widget, layout, widget.getScrollX(), layout.getLineTop
(bottomLine + 1) - innerHeight);
return true;
}
return false;
}
/// <summary>
/// Move the cursor to the buffer offset physically below the current
/// offset, or return false if the cursor is already on the bottom line.
/// </summary>
/// <remarks>
/// Move the cursor to the buffer offset physically below the current
/// offset, or return false if the cursor is already on the bottom line.
/// </remarks>
public static bool moveDown(android.text.Spannable text, android.text.Layout layout
)
{
int start = getSelectionStart(text);
int end = getSelectionEnd(text);
if (start != end)
{
int min = System.Math.Min(start, end);
int max = System.Math.Max(start, end);
setSelection(text, max);
if (min == 0 && max == text.Length)
{
return(false);
}
return(true);
}
else
{
int line = layout.getLineForOffset(end);
if (line < layout.getLineCount() - 1)
{
int move;
if (layout.getParagraphDirection(line) == layout.getParagraphDirection(line + 1))
{
float h = layout.getPrimaryHorizontal(end);
move = layout.getOffsetForHorizontal(line + 1, h);
}
else
{
move = layout.getLineStart(line + 1);
}
setSelection(text, move);
return(true);
}
}
return(false);
}
/// <summary>Performs a scroll down action.</summary>
/// <remarks>
/// Performs a scroll down action.
/// Scrolls down by the specified number of lines.
/// </remarks>
/// <param name="widget">The text view.</param>
/// <param name="buffer">The text buffer.</param>
/// <param name="amount">The number of lines to scroll by. Must be at least 1.</param>
/// <returns>True if the event was handled.</returns>
/// <hide></hide>
protected internal virtual bool scrollDown(android.widget.TextView widget, android.text.Spannable
buffer, int amount)
{
android.text.Layout layout = widget.getLayout();
int innerHeight = getInnerHeight(widget);
int bottom_1 = widget.getScrollY() + innerHeight;
int bottomLine = layout.getLineForVertical(bottom_1);
if (layout.getLineTop(bottomLine + 1) < bottom_1 + 1)
{
// Less than a pixel of this line is out of view,
// so we must have tried to make it entirely in view
// and now want the next line to be in view instead.
bottomLine += 1;
}
int limit = layout.getLineCount() - 1;
if (bottomLine <= limit)
{
bottomLine = System.Math.Min(bottomLine + amount - 1, limit);
android.text.method.Touch.scrollTo(widget, layout, widget.getScrollX(), layout.getLineTop
(bottomLine + 1) - innerHeight);
return true;
}
return false;
}
private static int findEdge(android.text.Spannable text, android.text.Layout layout
, int dir)
{
int pt = getSelectionEnd(text);
int line = layout.getLineForOffset(pt);
int pdir = layout.getParagraphDirection(line);
if (dir * pdir < 0)
{
return(layout.getLineStart(line));
}
else
{
int end = layout.getLineEnd(line);
if (line == layout.getLineCount() - 1)
{
return(end);
}
else
{
return(end - 1);
}
}
}