本文整理汇总了C#中TextView.GetDocumentLineByVisualTop方法的典型用法代码示例。如果您正苦于以下问题：C# TextView.GetDocumentLineByVisualTop方法的具体用法？C# TextView.GetDocumentLineByVisualTop怎么用？C# TextView.GetDocumentLineByVisualTop使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类TextView的用法示例。
在下文中一共展示了TextView.GetDocumentLineByVisualTop方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: GetUpDownCaretPosition
static TextViewPosition GetUpDownCaretPosition(TextView textView, TextViewPosition caretPosition, CaretMovementType direction, VisualLine visualLine, TextLine textLine, bool enableVirtualSpace, ref double xPos)
{
// moving up/down happens using the desired visual X position
if (double.IsNaN(xPos))
xPos = visualLine.GetTextLineVisualXPosition(textLine, caretPosition.VisualColumn);
// now find the TextLine+VisualLine where the caret will end up in
VisualLine targetVisualLine = visualLine;
TextLine targetLine;
int textLineIndex = visualLine.TextLines.IndexOf(textLine);
switch (direction) {
case CaretMovementType.LineUp:
{
// Move up: move to the previous TextLine in the same visual line
// or move to the last TextLine of the previous visual line
int prevLineNumber = visualLine.FirstDocumentLine.LineNumber - 1;
if (textLineIndex > 0) {
targetLine = visualLine.TextLines[textLineIndex - 1];
} else if (prevLineNumber >= 1) {
DocumentLine prevLine = textView.Document.GetLineByNumber(prevLineNumber);
targetVisualLine = textView.GetOrConstructVisualLine(prevLine);
targetLine = targetVisualLine.TextLines[targetVisualLine.TextLines.Count - 1];
} else {
targetLine = null;
}
break;
}
case CaretMovementType.LineDown:
{
// Move down: move to the next TextLine in the same visual line
// or move to the first TextLine of the next visual line
int nextLineNumber = visualLine.LastDocumentLine.LineNumber + 1;
if (textLineIndex < visualLine.TextLines.Count - 1) {
targetLine = visualLine.TextLines[textLineIndex + 1];
} else if (nextLineNumber <= textView.Document.LineCount) {
DocumentLine nextLine = textView.Document.GetLineByNumber(nextLineNumber);
targetVisualLine = textView.GetOrConstructVisualLine(nextLine);
targetLine = targetVisualLine.TextLines[0];
} else {
targetLine = null;
}
break;
}
case CaretMovementType.PageUp:
case CaretMovementType.PageDown:
{
// Page up/down: find the target line using its visual position
double yPos = visualLine.GetTextLineVisualYPosition(textLine, VisualYPosition.LineMiddle);
if (direction == CaretMovementType.PageUp)
yPos -= textView.RenderSize.Height;
else
yPos += textView.RenderSize.Height;
DocumentLine newLine = textView.GetDocumentLineByVisualTop(yPos);
targetVisualLine = textView.GetOrConstructVisualLine(newLine);
targetLine = targetVisualLine.GetTextLineByVisualYPosition(yPos);
break;
}
default:
throw new NotSupportedException(direction.ToString());
}
if (targetLine != null) {
double yPos = targetVisualLine.GetTextLineVisualYPosition(targetLine, VisualYPosition.LineMiddle);
int newVisualColumn = targetVisualLine.GetVisualColumn(new Point(xPos, yPos), enableVirtualSpace);
// prevent wrapping to the next line; TODO: could 'IsAtEnd' help here?
int targetLineStartCol = targetVisualLine.GetTextLineVisualStartColumn(targetLine);
if (newVisualColumn >= targetLineStartCol + targetLine.Length) {
if (newVisualColumn <= targetVisualLine.VisualLength)
newVisualColumn = targetLineStartCol + targetLine.Length - 1;
}
return targetVisualLine.GetTextViewPosition(newVisualColumn);
} else {
return caretPosition;
}
}