private bool OnLayoutImpl()
{
Rectangle clientRectangle = base.ClientRectangle;
Size size = clientRectangle.Size;
if ((size.Width >= 0) && (size.Height >= 0))
{
RectDouble viewportRect = clientRectangle.ToRectDouble();
SizeDouble num2 = size.ToSizeDouble();
int horizontalScrollBarHeight = SystemInformation.HorizontalScrollBarHeight;
int verticalScrollBarWidth = SystemInformation.VerticalScrollBarWidth;
PaintDotNet.Canvas.Canvas canvas = this.canvasControl.Canvas;
PaintDotNet.Canvas.CanvasView canvasView = this.canvasControl.CanvasView;
SizeDouble canvasSize = canvasView.CanvasSize;
RectDouble canvasBounds = canvasView.GetCanvasBounds();
SizeDouble viewportSize = canvasView.ViewportSize;
SizeDouble num9 = canvasView.ViewportCanvasBounds.Size;
PointDouble viewportCanvasOffset = canvasView.ViewportCanvasOffset;
PointDouble viewportCanvasOffsetMin = canvasView.ViewportCanvasOffsetMin;
PointDouble viewportCanvasOffsetMax = canvasView.ViewportCanvasOffsetMax;
SizeDouble num14 = canvasView.ConvertViewportToCanvas(viewportRect).Size;
SizeDouble num15 = new SizeDouble(Math.Max((double)0.0, (double)(num2.Width - verticalScrollBarWidth)), Math.Max((double)0.0, (double)(num2.Height - horizontalScrollBarHeight)));
RectDouble num16 = new RectDouble(viewportRect.Location, num15);
SizeDouble num18 = canvasView.ConvertViewportToCanvas(num16).Size;
ThicknessDouble frameCanvasPadding = canvasView.FrameCanvasPadding;
RectDouble framedCanvasBounds = canvasView.FramedCanvasBounds;
bool flag = false;
bool flag2 = false;
if ((this.canvasControl == null) || (canvasView.ScaleBasis == ScaleBasis.FitToViewport))
{
flag = false;
flag2 = false;
}
else
{
if (framedCanvasBounds.Width > num14.Width)
{
flag = true;
if (framedCanvasBounds.Height > num18.Height)
{
flag2 = true;
}
}
if (framedCanvasBounds.Height > num14.Height)
{
flag2 = true;
if (framedCanvasBounds.Width > num18.Width)
{
flag = true;
}
}
}
int num21 = size.Width - (flag2 ? verticalScrollBarWidth : 0);
int width = Math.Max(0, num21);
int num23 = size.Height - (flag ? horizontalScrollBarHeight : 0);
int height = Math.Max(0, num23);
Rectangle rectangle2 = new Rectangle(0, 0, width, height);
double scaleRatio = canvasView.ScaleRatio;
this.canvasControl.Bounds = rectangle2;
this.canvasControl.PerformLayout();
canvasView.CoerceValue(PaintDotNet.Canvas.CanvasView.ScaleRatioProperty);
if ((canvasView.ScaleRatio != scaleRatio) || (canvasView.ViewportSize != viewportSize))
{
return(false);
}
if (flag)
{
Rectangle newBounds = new Rectangle(0, size.Height - horizontalScrollBarHeight, size.Width - (flag2 ? verticalScrollBarWidth : 0), horizontalScrollBarHeight);
int min = this.ConvertToScrollBar(viewportCanvasOffsetMin.X);
int max = this.ConvertToScrollBar(viewportCanvasOffsetMax.X + num9.Width);
int newLargeChange = this.ConvertToScrollBar(num9.Width);
int newSmallChange = this.ConvertToScrollBar(num9.Width / 10.0);
int newValue = Int32Util.Clamp(this.ConvertToScrollBar(viewportCanvasOffset.X), min, max);
UpdateScrollBar(this.hScrollBar, newBounds, min, max, newLargeChange, newSmallChange, newValue);
}
if (flag2)
{
Rectangle rectangle4 = new Rectangle(size.Width - verticalScrollBarWidth, 0, verticalScrollBarWidth, size.Height - (flag ? horizontalScrollBarHeight : 0));
int num31 = this.ConvertToScrollBar(viewportCanvasOffsetMin.Y);
int num32 = this.ConvertToScrollBar(viewportCanvasOffsetMax.Y + num9.Height);
int num33 = this.ConvertToScrollBar(num9.Height);
int num34 = this.ConvertToScrollBar(num9.Height / 10.0);
int num35 = Int32Util.Clamp(this.ConvertToScrollBar(viewportCanvasOffset.Y), num31, num32);
UpdateScrollBar(this.vScrollBar, rectangle4, num31, num32, num33, num34, num35);
}
this.hScrollBar.Visible = flag;
this.vScrollBar.Visible = flag2;
}
return(true);
}
protected override void OnKeyDown(KeyEventArgs e)
{
if (e.Handled)
{
goto Label_0347;
}
PaintDotNet.Canvas.CanvasView canvasView = this.CanvasView;
if (canvasView == null)
{
goto Label_0347;
}
bool flag = false;
switch (e.KeyCode)
{
case Keys.PageUp:
if (!e.Shift)
{
canvasView.ViewportCanvasOffset -= new VectorDouble(0.0, canvasView.ViewportCanvasBounds.Height);
}
else
{
canvasView.ViewportCanvasOffset -= new VectorDouble(canvasView.ViewportCanvasBounds.Width, 0.0);
}
flag = true;
e.Handled = true;
goto Label_032E;
case Keys.Next:
if (!e.Shift)
{
canvasView.ViewportCanvasOffset += new VectorDouble(0.0, canvasView.ViewportCanvasBounds.Height);
break;
}
canvasView.ViewportCanvasOffset += new VectorDouble(canvasView.ViewportCanvasBounds.Width, 0.0);
break;
case Keys.End:
if (!e.Control || !e.Alt)
{
if (e.Control)
{
canvasView.ViewportCanvasOffset = canvasView.ViewportCanvasOffsetMax;
}
else
{
RectDouble visibleCanvasBounds = canvasView.GetVisibleCanvasBounds();
SizeDouble size = canvasView.ViewportCanvasBounds.Size;
PointDouble bottomRight = canvasView.GetCanvasBounds().BottomRight;
if ((visibleCanvasBounds.Left <= (bottomRight.X - 1.0)) && (visibleCanvasBounds.Right >= bottomRight.X))
{
if ((visibleCanvasBounds.Top > (bottomRight.Y - 1.0)) || (visibleCanvasBounds.Bottom < bottomRight.Y))
{
canvasView.ViewportCanvasOffset = new PointDouble(canvasView.ViewportCanvasOffset.X, bottomRight.Y - size.Height);
}
}
else
{
canvasView.ViewportCanvasOffset = new PointDouble(bottomRight.X - size.Width, canvasView.ViewportCanvasOffset.Y);
}
}
}
flag = true;
e.Handled = true;
goto Label_032E;
case Keys.Home:
if (!e.Control || !e.Alt)
{
if (e.Control)
{
canvasView.ViewportCanvasOffset = canvasView.ViewportCanvasOffsetMin;
}
else
{
RectDouble num2 = canvasView.GetVisibleCanvasBounds();
PointDouble topLeft = canvasView.GetCanvasBounds().TopLeft;
if ((num2.Left <= topLeft.X) && (num2.Right >= (topLeft.X + 1.0)))
{
if ((num2.Top > topLeft.Y) || (num2.Bottom < (topLeft.Y + 1.0)))
{
canvasView.ViewportCanvasOffset -= new VectorDouble(0.0, num2.Top - topLeft.Y);
}
}
else
{
canvasView.ViewportCanvasOffset -= new VectorDouble(num2.Left - topLeft.X, 0.0);
}
}
}
flag = true;
e.Handled = true;
goto Label_032E;
default:
goto Label_032E;
}
flag = true;
e.Handled = true;
Label_032E:
if (flag)
{
canvasView.SetValue(PaintDotNet.Canvas.CanvasView.ViewportCanvasOffsetProperty, canvasView.GetValue(PaintDotNet.Canvas.CanvasView.ViewportCanvasOffsetProperty));
}
Label_0347:
base.OnKeyDown(e);
}