/// <summary>
/// Used during a pinch operation to scale the content for a fast pinch effect. This does not actually change
/// the layout of the content, so this can be done very quickly. When the pinch completes, ResizeContent() will
/// update the content's layout with the final zoom ratio.
/// </summary>
private void ScaleContentDuringPinch()
{
double newMaxWidth = Math.Round(_size.Width * _zoomRatioDuringPinch);
double newMaxHeight = Math.Round(_size.Height * _zoomRatioDuringPinch);
double scaler = newMaxWidth / _zoomableContent.MaxWidth;
double newWidth = _actualContentSize.Width * scaler;
double newHeight = _actualContentSize.Height * scaler;
_transform.ScaleX = scaler;
_transform.ScaleY = scaler;
_viewport.Bounds = new Rect(0, 0, newWidth, newHeight);
// Pan the Viewport such that the point on the content where the pinch started doesn't move on the screen
//
Point pinchMidpointOnScaledContent = new Point(
newWidth * _pinchMidpointInPercentOfContent.X,
newHeight * _pinchMidpointInPercentOfContent.Y);
Point origin = new Point(
(int)(pinchMidpointOnScaledContent.X - _pinchMidpointInControlCoordinates.X),
(int)(pinchMidpointOnScaledContent.Y - _pinchMidpointInControlCoordinates.Y));
if (origin != _lastOrigin)
{
_viewport.SetViewportOrigin(origin);
_lastOrigin = origin;
}
}
private void ResizeImage(bool center)
{
if (_coercedScale != 0 && _bitmap != null)
{
var newWidth = Canvas.Width = Math.Round(_textureScale.Width * _coercedScale);
var newHeight = Canvas.Height = Math.Round(_textureScale.Height * _coercedScale);
Xform.ScaleX = Xform.ScaleY = _coercedScale;
Viewport.Bounds = new Rect(0, 0, newWidth, newHeight);
if (center)
{
Viewport.SetViewportOrigin(new Point(
Math.Round((newWidth - Viewport.ActualWidth) / 2),
Math.Round((newHeight - Viewport.ActualHeight) / 2)
));
}
else
{
var newImgMid = new Point(newWidth * _relativeMidpoint.X, newHeight * _relativeMidpoint.Y);
var origin = new Point(newImgMid.X - _screenMidpoint.X, newImgMid.Y - _screenMidpoint.Y);
Viewport.SetViewportOrigin(origin);
}
}
}
/// <summary>
/// Adjust the size of the image according to the coerced scale factor. Optionally
/// center the image, otherwise, try to keep the original midpoint of the pinch
/// in the same spot on the screen regardless of the scale.
/// </summary>
/// <param name="center">Center the image on the viewport</param>
private void ResizeImage(bool center)
{
if (_coercedScale != 0 &&
null != _bitmap &&
null != _imagePanel &&
null != Image &&
null != _viewport)
{
// Store, and change the width and height of the canvas to fit the size of the new image.
double newWidth = _imagePanel.Width = Math.Round(_bitmap.PixelWidth * _coercedScale);
double newHeight = _imagePanel.Height = Math.Round(_bitmap.PixelHeight * _coercedScale);
// Scale the image by _coercedScale amount
// Values between 0 and 1 decrease the width/height of the scaled object;
// Values greater than 1 increase the width/height of the scaled object.
// A value of 1 indicates that the object is not scaled in the x/y-direction.
// Negative values flip the scaled object horizontally/vertically.
// Values between 0 and -1 flip the scale object and decrease its width/height.
// Values less than -1 flip the object and increase its width/height.
// A value of -1 flips the scaled object but does not change its horizontal/vertical size.
// Scale both the width and the height simultaneously to preserve the aspect ratio.
if (null == Image.RenderTransform || !(Image.RenderTransform is ScaleTransform))
{
Image.RenderTransform = new ScaleTransform();
}
if (null == Image.RenderTransformOrigin)
{
Image.RenderTransformOrigin = new Point(0.0d, 0.0d);
}
ScaleTransform xform = (ScaleTransform)Image.RenderTransform;
xform.ScaleX = xform.ScaleY = _coercedScale;
_viewport.Bounds = new Rect(0, 0, newWidth, newHeight);
if (center)
{
_viewport.SetViewportOrigin(
new Point(
Math.Round((newWidth - _viewport.ActualWidth) / 2),
Math.Round((newHeight - _viewport.ActualHeight) / 2)
));
}
else
{
Point newImgMid = new Point(newWidth * _relativeMidpoint.X, newHeight * _relativeMidpoint.Y);
Point origin = new Point(newImgMid.X - _screenMidpoint.X, newImgMid.Y - _screenMidpoint.Y);
_viewport.SetViewportOrigin(origin);
}
}
}
public void ScrollToTop()
{
Rect rect = this.Viewport.Viewport;
// ISSUE: explicit reference operation
double y = rect.Y;
rect = this._viewport.Bounds;
// ISSUE: explicit reference operation
double top1 = rect.Top;
if (y == top1)
{
return;
}
if (this.ItemsSource != null && this.ItemsSource.Count > 0)
{
this.ScrollTo(this.ItemsSource[0]);
}
ViewportControl viewport = this.Viewport;
double num = 0.0;
Rect bounds = this._viewport.Bounds;
// ISSUE: explicit reference operation
double top2 = ((Rect)@bounds).Top;
Point point = new Point(num, top2);
viewport.SetViewportOrigin(point);
this.UpdateScrollPosition();
}
private void DoScrollToTopOrBottom(bool toBottom, Action onCompletedCallback)
{
Rect rect;
double num1;
if (!toBottom)
{
num1 = 0.0;
}
else
{
rect = this._vpCtrl.Bounds;
// ISSUE: explicit reference operation
num1 = rect.Bottom - ((FrameworkElement)this._vpCtrl).ActualHeight;
}
double to = num1;
ViewportMediator viewportMediator = new ViewportMediator();
viewportMediator.ViewportControl = this._vpCtrl;
this._vpCtrl.ViewportChanged -= (new EventHandler <ViewportChangedEventArgs>(this._vpCtrl_ViewportChanged));
rect = this._vpCtrl.Viewport;
// ISSUE: explicit reference operation
double y = rect.Y;
double to1 = to;
DependencyProperty verticalOffsetProperty = ViewportMediator.VerticalOffsetProperty;
int duration = 250;
int? startTime = new int?(0);
CubicEase cubicEase = new CubicEase();
Action completed = (Action)(() =>
{
ViewportControl vpCtrl = this._vpCtrl;
Rect viewport = this._vpCtrl.Viewport;
// ISSUE: explicit reference operation
Point point = new Point(((Rect)@viewport).X, to);
vpCtrl.SetViewportOrigin(point);
this._vpCtrl.ViewportChanged += (new EventHandler <ViewportChangedEventArgs>(this._vpCtrl_ViewportChanged));
if (onCompletedCallback == null)
{
return;
}
onCompletedCallback();
});
int num2 = 0;
((DependencyObject)viewportMediator).Animate(y, to1, verticalOffsetProperty, duration, startTime, cubicEase, completed, num2 != 0);
}
void OnScrollToRequested(object sender, ScrollToRequestedEventArgs e)
{
if (_animatable == null && e.ShouldAnimate)
{
_animatable = new Animatable();
}
if (_viewport == null)
{
// Making sure we're actually loaded
if (VisualTreeHelper.GetChildrenCount(_listBox) == 0)
{
RoutedEventHandler handler = null;
handler = (o, args) =>
{
Control.Loaded -= handler;
OnScrollToRequested(sender, e);
};
Control.Loaded += handler;
return;
}
_viewport = (ViewportControl)VisualTreeHelper.GetChild(VisualTreeHelper.GetChild(VisualTreeHelper.GetChild(_listBox, 0), 0), 0);
if (_viewport.Viewport.Bottom == 0)
{
EventHandler <ViewportChangedEventArgs> viewportChanged = null;
viewportChanged = (o, args) =>
{
if (_viewport.Viewport.Bottom == 0)
{
return;
}
_viewport.ViewportChanged -= viewportChanged;
OnScrollToRequested(sender, e);
};
_viewport.ViewportChanged += viewportChanged;
return;
}
}
double y = 0;
double targetHeight = 0;
double targetHeaderHeight = 0;
var templateReusables = new Dictionary <System.Windows.DataTemplate, FrameworkElement>();
var found = false;
if (Element.IsGroupingEnabled)
{
for (var g = 0; g < Element.TemplatedItems.Count; g++)
{
if (found)
{
break;
}
TemplatedItemsList <ItemsView <Cell>, Cell> til = Element.TemplatedItems.GetGroup(g);
double headerHeight = GetHeight(templateReusables, Control.GroupHeaderTemplate, til);
y += headerHeight;
for (var i = 0; i < til.Count; i++)
{
Cell cell = til[i];
double contentHeight = GetHeight(templateReusables, Control.ItemTemplate, cell);
if ((ReferenceEquals(til.BindingContext, e.Group) || e.Group == null) && ReferenceEquals(cell.BindingContext, e.Item))
{
targetHeaderHeight = headerHeight;
targetHeight = contentHeight;
found = true;
break;
}
y += contentHeight;
}
}
}
else
{
for (var i = 0; i < Element.TemplatedItems.Count; i++)
{
Cell cell = Element.TemplatedItems[i];
double height = GetHeight(templateReusables, Control.ItemTemplate, cell);
if (ReferenceEquals(cell.BindingContext, e.Item))
{
found = true;
targetHeight = height;
break;
}
y += height;
}
}
if (!found)
{
return;
}
ScrollToPosition position = e.Position;
if (position == ScrollToPosition.MakeVisible)
{
if (y >= _viewport.Viewport.Top && y <= _viewport.Viewport.Bottom)
{
return;
}
if (y > _viewport.Viewport.Bottom)
{
position = ScrollToPosition.End;
}
else
{
position = ScrollToPosition.Start;
}
}
if (position == ScrollToPosition.Start && Element.IsGroupingEnabled)
{
y = y - targetHeaderHeight;
}
else if (position == ScrollToPosition.Center)
{
y = y - (_viewport.ActualHeight / 2 + targetHeight / 2);
}
else if (position == ScrollToPosition.End)
{
y = y - _viewport.ActualHeight + targetHeight;
}
double startY = _viewport.Viewport.Y;
double distance = y - startY;
if (e.ShouldAnimate)
{
var animation = new Animation(v => { _viewport.SetViewportOrigin(new System.Windows.Point(0, startY + distance * v)); });
animation.Commit(_animatable, "ScrollTo", length: 500, easing: Easing.CubicInOut);
}
else
{
_viewport.SetViewportOrigin(new System.Windows.Point(0, y));
}
}
