/// <summary>
/// 设置8个小正方形位置
/// </summary>
public void SetRectangles()
{
//msgBox.Text = "FocusRect height: " + FocusRect.Height + " Width:" + FocusRect.Width + " Top:" + FocusRect.GetValue(Canvas.TopProperty) + " Left:" + FocusRect.GetValue(Canvas.LeftProperty);
//左上
SmallRect[0].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) - Square.Width / 2);
SmallRect[0].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) - Square.Height / 2);
//上中间
SmallRect[4].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + (FocusRect.Width - Square.Width) / 2);
SmallRect[4].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) - Square.Height / 2);
//右上
SmallRect[1].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + FocusRect.Width - Square.Width / 2);
SmallRect[1].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) - Square.Height / 2);
//左下
SmallRect[2].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) - Square.Width / 2);
SmallRect[2].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + FocusRect.Height - Square.Height / 2);
//下中间
SmallRect[5].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + (FocusRect.Width - Square.Width) / 2);
SmallRect[5].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + FocusRect.Height - Square.Height / 2);
//右下
SmallRect[3].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + FocusRect.Width - Square.Height / 2);
SmallRect[3].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + FocusRect.Height - Square.Height / 2);
//左中间
SmallRect[6].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) - Square.Width / 2);
SmallRect[6].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + (FocusRect.Height - Square.Height) / 2);
//右中间
SmallRect[7].SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + FocusRect.Width - Square.Width / 2);
SmallRect[7].SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + (FocusRect.Height - Square.Height) / 2);
}
/// <summary>
/// 计算并设置Scroll的偏移量
/// </summary>
/// <param name="offSetX">鼠标X轴移动的偏移量</param>
/// <param name="offSetY">鼠标Y轴移动的偏移量</param>
void ComputeScrollOffSet(double offSetX, double offSetY)
{
double FocusRectTop = (double)FocusRect.GetValue(Canvas.TopProperty);
double FocusRectLeft = (double)FocusRect.GetValue(Canvas.LeftProperty);
double ViewportHostTop = (double)ViewportHost.GetValue(Canvas.TopProperty);
double ViewportHostLeft = (double)ViewportHost.GetValue(Canvas.LeftProperty);
//msgBox.Text = "FocusRect.Height" + FocusRect.Height + " ViewportHost.Height" + ViewportHost.Height;
if (offSetY > 0 && (FocusRect.Height + 8) < ViewportHost.Height && (ViewportHostTop + ViewportHost.Height) > (FocusRectTop + FocusRect.Height)) //鼠标向下且未出ViewportHost区域时
{
imageScroll.ScrollToVerticalOffset(imageScroll.VerticalOffset + (offSetY / 2) * (Viewport.Height / (ViewportHost.Height - FocusRectTop - FocusRect.Height)));
}
if (offSetY < 0 && (FocusRect.Height + 8) < ViewportHost.Height && ViewportHostTop < FocusRectTop) //鼠标向上且未出ViewportHost区域时
{
imageScroll.ScrollToVerticalOffset(imageScroll.VerticalOffset + (offSetY / 2) * ((Viewport.Height / FocusRectTop)));
}
if (offSetX > 0 && (FocusRect.Width + 8) < ViewportHost.Width && (ViewportHostLeft + ViewportHost.Width) > (FocusRectLeft + FocusRect.Width)) //鼠标向右且未出ViewportHost区域时
{
imageScroll.ScrollToHorizontalOffset(imageScroll.HorizontalOffset + (offSetX / 2) * (Viewport.Width / (ViewportHost.Width - FocusRectLeft - FocusRect.Width)));
}
if (offSetX < 0 && (FocusRect.Width + 8) < ViewportHost.Width && ViewportHostLeft < FocusRectLeft) //鼠标向左且未出ViewportHost区域时
{
imageScroll.ScrollToHorizontalOffset(imageScroll.HorizontalOffset + (offSetX / 2) * ((Viewport.Width / FocusRectLeft)));
}
}
/// <summary>
/// 确保FocusRect在Viewport中进行缩放
/// </summary>
public void AssureFocusRectZoomInZone(double zoom, double mininum)
{
double ViewPortTop = (double)Viewport.GetValue(Canvas.TopProperty);
double ViewPortLeft = (double)Viewport.GetValue(Canvas.LeftProperty);
double FocusRectTop = (double)FocusRect.GetValue(Canvas.TopProperty);
double FocusRectLeft = (double)FocusRect.GetValue(Canvas.LeftProperty);
if (zoom == mininum)
{
FocusRect.SetValue(Canvas.LeftProperty, ViewPortLeft);
FocusRect.Width = Viewport.Width;
}
else
{
//确保顶部不越界
if (ViewPortTop > FocusRectTop)
{
FocusRect.SetValue(Canvas.TopProperty, ViewPortTop);
}
//确保左侧不越界
if (ViewPortLeft > FocusRectLeft)
{
FocusRect.SetValue(Canvas.LeftProperty, ViewPortLeft);
}
//判断x是否右侧越界
if ((Viewport.Width + ViewPortLeft) < (FocusRect.Width + FocusRectLeft))
{
//如果已越界，但左侧未越界
if (Viewport.Width > FocusRect.Width)
{
FocusRect.SetValue(Canvas.LeftProperty, ViewPortLeft + Viewport.Width - FocusRect.Width);
}
else
{
FocusRect.Width = Viewport.Width;
}
}
//判断是否底部越界
if ((Viewport.Height + ViewPortTop) < (FocusRect.Height + FocusRectTop))
{
//如果已越界，但顶部未越界
if (Viewport.Height > FocusRect.Height)
{
FocusRect.SetValue(Canvas.TopProperty, ViewPortTop + Viewport.Height - FocusRect.Height);
}
else
{
FocusRect.Height = Viewport.Height;
}
}
}
SetRectangles();
}
/// <summary>
/// SmallRect[]鼠标移动事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void smallRectangle_MouseMove(object sender, MouseEventArgs e)
{
if (trackingMouseMove)
{
FrameworkElement element = sender as FrameworkElement;
double offSetY = e.GetPosition(element).Y - prevLeftClick.Y;
double offSetX = e.GetPosition(element).X - prevLeftClick.X;
if (AssureFocusRectMoveInZone(element.Name))
{
switch (this.CurrHitPlace)
{
case HitDownSquare.HDS_TOP:
if ((FocusRect.Height - offSetY) > 4)
{
FocusRect.Height = FocusRect.Height - offSetY;
if (FocusRect.Height > 4)
{
FocusRect.SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + offSetY);
}
}
break;
case HitDownSquare.HDS_TOPLEFT:
if ((FocusRect.Height - offSetY) > 4)
{
FocusRect.Height = FocusRect.Height - offSetY;
if (FocusRect.Height > 4)
{
FocusRect.SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + offSetY);
}
}
if ((FocusRect.Width - offSetX) > 4)
{
FocusRect.Width = FocusRect.Width - offSetX;
if (FocusRect.Width > 4)
{
FocusRect.SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + offSetX);
}
}
break;
case HitDownSquare.HDS_TOPRIGHT:
if ((FocusRect.Height - offSetY) > 4)
{
FocusRect.Height = FocusRect.Height - offSetY;
if (FocusRect.Height > 4)
{
FocusRect.SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + offSetY);
}
}
if ((FocusRect.Width + offSetX) > 4)
{
FocusRect.Width = FocusRect.Width + offSetX;
}
break;
case HitDownSquare.HDS_RIGHT:
if ((FocusRect.Width + offSetX) > 4)
{
FocusRect.Width = FocusRect.Width + offSetX;
}
break;
case HitDownSquare.HDS_BOTTOM:
if ((FocusRect.Height + offSetY) > 4)
{
FocusRect.Height = FocusRect.Height + offSetY;
}
break;
case HitDownSquare.HDS_BOTTOMLEFT:
if ((FocusRect.Height + offSetY) > 4)
{
FocusRect.Height = FocusRect.Height + offSetY;
}
if ((FocusRect.Width - offSetX) > 4)
{
FocusRect.Width = FocusRect.Width - offSetX;
if (FocusRect.Width > 4)
{
FocusRect.SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + offSetX);
}
}
break;
case HitDownSquare.HDS_BOTTOMRIGHT:
if ((FocusRect.Height + offSetY) > 4)
{
FocusRect.Height = FocusRect.Height + offSetY;
}
if ((FocusRect.Width + offSetX) > 4)
{
FocusRect.Width = FocusRect.Width + offSetX;
}
break;
case HitDownSquare.HDS_LEFT:
if ((FocusRect.Width - offSetX) > 4)
{
FocusRect.Width = FocusRect.Width - offSetX;
if (FocusRect.Width > 4)
{
FocusRect.SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + offSetX);
}
}
break;
case HitDownSquare.HDS_NONE:
FocusRect.SetValue(Canvas.LeftProperty, (double)FocusRect.GetValue(Canvas.LeftProperty) + offSetX);
FocusRect.SetValue(Canvas.TopProperty, (double)FocusRect.GetValue(Canvas.TopProperty) + offSetY);
break;
}
}
SetRectangles();
}
}
/// <summary>
/// FocusRect是否在Viewport中，如不在，则确保其不超出Viewport区域
/// </summary>
/// <returns></returns>
bool AssureFocusRectMoveInZone(string elementName)
{
bool result = true;
//try
//{
double ViewPortTop = (double)Viewport.GetValue(Canvas.TopProperty);
double ViewPortLeft = (double)Viewport.GetValue(Canvas.LeftProperty);
double FocusRectTop = (double)FocusRect.GetValue(Canvas.TopProperty);
double FocusRectLeft = (double)FocusRect.GetValue(Canvas.LeftProperty);
if (Viewport.Height > ViewportHost.Height) //已使用放大功能,向上拖动
{
if (0 > FocusRectTop)
{
FocusRect.SetValue(Canvas.TopProperty, (double)ViewportHost.GetValue(Canvas.TopProperty) + 4);
result = false;
}
}
else
{
if (ViewPortTop > FocusRectTop)
{
FocusRect.SetValue(Canvas.TopProperty, ViewPortTop);
result = false;
}
}
if (Viewport.Width >= ViewportHost.Width) //已使用放大功能,向左拖动
{
if (0 > FocusRectLeft)
{
FocusRect.SetValue(Canvas.LeftProperty, (double)ViewportHost.GetValue(Canvas.LeftProperty) + 4);
result = false;
}
}
else
{
if (ViewPortLeft > FocusRectLeft)
{
FocusRect.SetValue(Canvas.LeftProperty, ViewPortLeft);
result = false;
}
}
if (Viewport.Width >= ViewportHost.Width) //已使用放大功能,向右拖动
{
if ((ViewportHost.Width) < (FocusRect.Width + FocusRectLeft))
{
if (elementName == "FocusRect")
{
FocusRect.SetValue(Canvas.LeftProperty, ViewportHost.Width - FocusRect.Width - 4);
}
else
{
FocusRect.Width = ViewportHost.Width - FocusRectLeft - 4;
}
result = false;
}
}
else
{
if ((Viewport.Width + ViewPortLeft) < (FocusRect.Width + FocusRectLeft))
{
if (elementName == "FocusRect")
{
FocusRect.SetValue(Canvas.LeftProperty, ViewPortLeft + Viewport.Width - FocusRect.Width);
}
else
{
FocusRect.Width = ViewPortLeft + Viewport.Width - FocusRectLeft;
}
result = false;
}
}
if (Viewport.Height > ViewportHost.Height) //已使用放大功能,向下拖动
{
if ((ViewportHost.Height) < (FocusRect.Height + FocusRectTop))
{
if (elementName == "FocusRect")
{
FocusRect.SetValue(Canvas.TopProperty, ViewportHost.Height - FocusRect.Height - 4);
}
else
{
FocusRect.Height = ViewportHost.Height - FocusRectTop - 4;
}
result = false;
}
}
else
{
if ((Viewport.Height + ViewPortTop) < (FocusRect.Height + FocusRectTop))
{
if (elementName == "FocusRect")
{
FocusRect.SetValue(Canvas.TopProperty, ViewPortTop + Viewport.Height - FocusRect.Height);
}
else
{
FocusRect.Height = ViewPortTop + Viewport.Height - FocusRectTop;
}
result = false;
}
}
//}
//catch
//{
// result = false;
//}
return(result);
}
/// <summary>
/// FocusRect鼠标移动事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void FocusRect_MouseMove(object sender, MouseEventArgs e)
{
FrameworkElement element = sender as FrameworkElement;
if (element != null)
{
element.Cursor = Cursors.None;
}
if (trackingMouseMove)
{
double offSetX = e.GetPosition(element).X - prevLeftClick.X;
double offSetY = e.GetPosition(element).Y - prevLeftClick.Y;
if (((double)element.GetValue(Canvas.TopProperty) + offSetY) >= 4 && (((double)FocusRect.GetValue(Canvas.TopProperty) + FocusRect.Height) + offSetY + 3) <= ViewportHost.Height)
{
element.SetValue(Canvas.TopProperty, (double)element.GetValue(Canvas.TopProperty) + offSetY);
}
if (((double)element.GetValue(Canvas.LeftProperty) + offSetX) >= 4 && (((double)FocusRect.GetValue(Canvas.LeftProperty) + FocusRect.Width) + offSetX + 3) <= ViewportHost.Width)
{
element.SetValue(Canvas.LeftProperty, (double)element.GetValue(Canvas.LeftProperty) + offSetX);
}
ComputeScrollOffSet(offSetX, offSetY);
SetRectangles();
}
customCursors.SetPostion(e.GetPosition(LayoutRoot));
}
