protected virtual void OnVerticalVisibleRegionChanged(VisibleRegionChangedEventArgs e)
{
if (VerticalVisibleRegionChanged != null)
{
VerticalVisibleRegionChanged(this, e);
}
}
protected virtual void OnHorizontalVisibleRegionChanged(VisibleRegionChangedEventArgs e)
{
if (HorizontalVisibleRegionChanged != null)
{
HorizontalVisibleRegionChanged(this, e);
}
}
public override bool Equals(object obj)
{
VisibleRegionChangedEventArgs other = obj as VisibleRegionChangedEventArgs;
return(other != null &&
this.FirstVisibleIndex == other.FirstVisibleIndex &&
this.LastVisibleIndex == other.LastVisibleIndex &&
this.TotalLength == other.TotalLength);
}
private void setScrollBarRegion(ScrollBar scrollBar, VisibleRegionChangedEventArgs e)
{
if (e.FirstVisibleIndex == 0 && e.LastVisibleIndex == e.TotalLength - 1)
{
scrollBar.Enabled = false;
}
else
{
scrollBar.Enabled = true;
scrollBar.Minimum = 0;
scrollBar.Maximum = e.TotalLength - 1;
scrollBar.LargeChange = e.LastVisibleIndex - e.FirstVisibleIndex + 1;
scrollBar.Value = e.FirstVisibleIndex;
}
}
private int calcRowOffset(int cursorRow, int visibleRows, int documentRows)
{
int rowOffset = calculateOffset(cursorRow, visibleRows, documentRows, 1);
var verticalEventArgs = createVisibleRegionChangedEventArgs(rowOffset, visibleRows, documentRows);
oldVerticalEventArgs = Util.RaiseIfEventArgsChanged(OnVerticalVisibleRegionChanged,
verticalEventArgs,
oldVerticalEventArgs);
return rowOffset;
}
private int calcColumnOffset(int cursorColumn, int visibleColumns, int documentColumns, int currentLineColumns)
{
int columnOffset;
if (WordWrap)
{
visibleColumns += 1;
columnOffset = Math.Min(0, visibleColumns - 1 - cursorColumn);
int extraColumns = 0;
if (cursorColumn >= visibleColumns - 1)
extraColumns = -columnOffset + Math.Max(0, ImportedText.CountSpaces(TypedText.Length) - 1);
documentColumns = visibleColumns + extraColumns;
}
else
{
const int visibleColumnsBeforeJumpBack = 6;
int jumpBackZone = Math.Max(1, visibleColumns - (visibleColumns / 2) + 2 - visibleColumnsBeforeJumpBack);
columnOffset = calculateOffset(cursorColumn, visibleColumns, currentLineColumns, jumpBackZone);
}
var horizontalEventArgs = createVisibleRegionChangedEventArgs(columnOffset, visibleColumns, documentColumns);
oldHorizontalEventArgs = Util.RaiseIfEventArgsChanged(OnHorizontalVisibleRegionChanged,
horizontalEventArgs,
oldHorizontalEventArgs);
return columnOffset;
}
protected virtual void OnVerticalVisibleRegionChanged(VisibleRegionChangedEventArgs e)
{
if (VerticalVisibleRegionChanged != null)
VerticalVisibleRegionChanged(this, e);
}
protected virtual void OnHorizontalVisibleRegionChanged(VisibleRegionChangedEventArgs e)
{
if (HorizontalVisibleRegionChanged != null)
HorizontalVisibleRegionChanged(this, e);
}
private void setScrollBarRegion(ScrollBar scrollBar, VisibleRegionChangedEventArgs e)
{
if (e.FirstVisibleIndex == 0 && e.LastVisibleIndex == e.TotalLength - 1)
scrollBar.Enabled = false;
else
{
scrollBar.Enabled = true;
scrollBar.Minimum = 0;
scrollBar.Maximum = e.TotalLength - 1;
scrollBar.LargeChange = e.LastVisibleIndex - e.FirstVisibleIndex + 1;
scrollBar.Value = e.FirstVisibleIndex;
}
}
private void picTyping_VerticalVisibleRegionChanged(object sender, VisibleRegionChangedEventArgs e)
{
firstVisibleRow = e.FirstVisibleIndex;
setScrollBarRegion(scrVTyping, e);
}
private void picTyping_HorizontalVisibleRegionChanged(object sender, VisibleRegionChangedEventArgs e)
{
firstVisibleColumn = e.FirstVisibleIndex;
setScrollBarRegion(scrHTyping, e);
}
private void picTyping_VerticalVisibleRegionChanged(object sender, VisibleRegionChangedEventArgs e)
{
firstVisibleRow = e.FirstVisibleIndex;
setScrollBarRegion(scrVTyping, e);
}
private void picTyping_HorizontalVisibleRegionChanged(object sender, VisibleRegionChangedEventArgs e)
{
firstVisibleColumn = e.FirstVisibleIndex;
setScrollBarRegion(scrHTyping, e);
}
