/// <summary>
/// キャレットがあるところまでスクロールする
/// </summary>
/// <return>再描写する必要があるなら真を返す</return>
/// <remarks>Document.Update(type == UpdateType.Clear)イベント時に呼び出した場合、例外が発生します</remarks>
public bool AdjustCaretAndSrc(AdjustFlow flow = AdjustFlow.Both)
{
IEditorRender render = (IEditorRender)base.render;
bool result;
Point pos;
if (this.PageBound.Width == 0 || this.PageBound.Height == 0)
{
this.SetCaretPostion(this.Padding.Left + render.FoldingWidth, 0);
return(false);
}
(result, pos) = this.AdjustSrc(this.Document.CaretPostion, flow);
this.SetCaretPostion(pos.X, pos.Y);
return(result);
}
/// <summary>
/// テキストポイントが含まれるように表示位置を調整します
/// </summary>
/// <param name="tp">テキストポイント</param>
/// <param name="flow">調整方向</param>
/// <returns>調整位置が変わったなら真。変わってないなら偽</returns>
public (bool, Point) AdjustSrc(TextPoint tp, AdjustFlow flow)
{
bool result = false;
Point tpPoint = new Point();
double x = this.CaretLocation.X;
double y = this.CaretLocation.Y;
Point relPoint = this.LayoutLines.GetLayout(tp.row).GetPostionFromIndex(tp.col);
if (flow == AdjustFlow.Col || flow == AdjustFlow.Both)
{
x = relPoint.X;
double left = this.Src.X;
double right = this.Src.X + this.render.TextArea.Width;
if (x >= left && x <= right) //xは表示領域にないにある
{
x -= left;
}
else if (x > right) //xは表示領域の右側にある
{
this.Document.Src = new SrcPoint(x - this.render.TextArea.Width + this.ScrollMarginWidth, this.Document.Src.Row, this.Document.Src.OffsetY);
if (this.Document.RightToLeft && this.Document.Src.X > 0)
{
System.Diagnostics.Debug.Assert(x > 0);
this.Document.Src = new SrcPoint(0, this.Document.Src.Row, this.Document.Src.OffsetY);
}
else
{
x = this.render.TextArea.Width - this.ScrollMarginWidth;
}
result = true;
}
else if (x < left) //xは表示領域の左側にある
{
this.Document.Src = new SrcPoint(x - this.ScrollMarginWidth, this.Document.Src.Row, this.Document.Src.OffsetY);
if (!this.Document.RightToLeft && this.Document.Src.X < this.render.TextArea.X)
{
this.Document.Src = new SrcPoint(0, this.Document.Src.Row, this.Document.Src.OffsetY);
}
else
{
x = this.ScrollMarginWidth;
}
result = true;
}
x += this.render.TextArea.X;
}
if (flow == AdjustFlow.Row || flow == AdjustFlow.Both)
{
int PhyLineCountOnScreen = (int)(this.render.TextArea.Height / this.render.emSize.Height);
//計算量を減らすため
if (tp.row < this.Src.Row || this.Src.Row + PhyLineCountOnScreen * 2 < tp.row)
{
this.Document.Src = new SrcPoint(this.Src.X, tp.row, -relPoint.Y);
}
//キャレットのY座標を求める
double lineHeight = this.render.emSize.Height;
double caret_y = this.Src.OffsetY; //src.rowからキャレット位置
double alignedHeight = PhyLineCountOnScreen * lineHeight - lineHeight;
for (int i = this.Src.Row; i < tp.row; i++)
{
int lineHeadIndex = this.LayoutLines.GetIndexFromLineNumber(i);
int lineLength = this.LayoutLines.GetLengthFromLineNumber(i);
if (this.LayoutLines.FoldingCollection.IsHidden(lineHeadIndex))
{
continue;
}
caret_y += this.LayoutLines.GetLayout(i).Height;
}
caret_y += relPoint.Y;
if (caret_y < 0)
{
this.Document.Src = new SrcPoint(this.Src.X, tp.row, -relPoint.Y);
y = 0;
}
else if (caret_y >= 0 && caret_y < alignedHeight)
{
y = caret_y;
}
else if (caret_y >= alignedHeight)
{
SrcPoint newsrc = this.GetNearstRowAndOffsetY(tp.row, -(alignedHeight - relPoint.Y));
this.Document.Src = new SrcPoint(this.Src.X, newsrc.Row, -newsrc.OffsetY);
y = alignedHeight;
}
y += this.render.TextArea.Y;
result = true;
}
if (result)
{
this.OnSrcChanged(null);
}
tpPoint.X = x;
tpPoint.Y = y;
return(result, tpPoint);
}
