private void ImageShow_MouseWheel(object sender, MouseWheelEventArgs e)
{
var horizontalOffset = ImageScrollViewer.HorizontalOffset;
var verticalOffset = ImageScrollViewer.VerticalOffset;
if (e.Delta > 0)
{
double delta = 1.1;
ImageShow.Width *= delta;
ImageShow.Height *= delta;
ImageScrollViewer.ScrollToHorizontalOffset(horizontalOffset * delta);
ImageScrollViewer.ScrollToVerticalOffset(verticalOffset * delta);
}
else
{
if (e.Delta < 0)
{
double delta = 0.9;
ImageShow.Width *= delta;
ImageShow.Height *= delta;
ImageScrollViewer.ScrollToHorizontalOffset(horizontalOffset * delta);
ImageScrollViewer.ScrollToVerticalOffset(verticalOffset * delta);
}
}
}
private void CloseButton_Click(object sender, RoutedEventArgs e)
{
var x = ImageScrollViewer.ZoomFactor;
ImageScrollViewer.ZoomToFactor(1);
ZoomImage.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}
private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
var b = VisualStateManager.GoToState(CurrentImagePage, "Low", true);
Debug.WriteLine("NavigationHelper_LoadState");
// Reset the scroll and zoom of the image
ImageScrollViewer.ChangeView(null, null, 1.0f, true);//.ZoomToFactor(1);
//var r = ImageScrollViewer.ChangeView(0, 0, 1, false);
try
{
var x = DisplayInformation.GetForCurrentView();
if (e.NavigationParameter != null)
{
this.ImageViewModel.Post = Post.FromXml(e.NavigationParameter as string);
await ImageViewModel.UpdateIsFavorited();
this.ImageViewModel.Comments = await Comments.GetComments(this.ImageViewModel.Post.Id);
}
}
catch (Exception ex)
{
}
if (ApiInformation.IsTypePresent("Windows.UI.ViewManagement.StatusBar"))
{
var statusBar = StatusBar.GetForCurrentView();
if (statusBar != null)
{
await statusBar.HideAsync();
}
}
}
void OnSliderValueChanged(object sender, RoutedPropertyChangedEventArgs <double> e)
{
ImageScaleTransform.ScaleX = e.NewValue;
ImageScaleTransform.ScaleY = e.NewValue;
var centerOfViewport = new Point(ImageScrollViewer.ViewportWidth / 2, ImageScrollViewer.ViewportHeight / 2);
_lastCenterPositionOnTarget = ImageScrollViewer.TranslatePoint(centerOfViewport, ImageGrid);
}
void OnScrollViewerScrollChanged(object sender, ScrollChangedEventArgs e)
{
if (e.ExtentHeightChange != 0 || e.ExtentWidthChange != 0)
{
Point?targetBefore = null;
Point?targetNow = null;
if (!_lastMousePositionOnTarget.HasValue)
{
if (_lastCenterPositionOnTarget.HasValue)
{
var centerOfViewport = new Point(ImageScrollViewer.ViewportWidth / 2, ImageScrollViewer.ViewportHeight / 2);
var centerOfTargetNow = ImageScrollViewer.TranslatePoint(centerOfViewport, ImageGrid);
targetBefore = _lastCenterPositionOnTarget;
targetNow = centerOfTargetNow;
}
}
else
{
targetBefore = _lastMousePositionOnTarget;
targetNow = Mouse.GetPosition(ImageGrid);
_lastMousePositionOnTarget = null;
}
if (targetBefore.HasValue)
{
var dXInTargetPixels = targetNow.Value.X - targetBefore.Value.X;
var dYInTargetPixels = targetNow.Value.Y - targetBefore.Value.Y;
var multiplicatorX = e.ExtentWidth / ImageGrid.Width;
var multiplicatorY = e.ExtentHeight / ImageGrid.Height;
var newOffsetX = ImageScrollViewer.HorizontalOffset - dXInTargetPixels * multiplicatorX;
var newOffsetY = ImageScrollViewer.VerticalOffset - dYInTargetPixels * multiplicatorY;
if (double.IsNaN(newOffsetX) || double.IsNaN(newOffsetY))
{
return;
}
ImageScrollViewer.ScrollToHorizontalOffset(newOffsetX);
ImageScrollViewer.ScrollToVerticalOffset(newOffsetY);
}
}
}
public async Task OpenFileAsync(StorageFile file)
{
CanvasBitmap fileBitmap = null;
var extension = file.FileType;
switch (extension)
{
case ".bin":
var buffer = await FileIO.ReadBufferAsync(file);
var width = 0;
var height = 0;
var format = DirectXPixelFormat.B8G8R8A8UIntNormalized;
// If the image name ends in (width)x(height), then use that in the dialog
var fileName = file.Name;
var fileStem = fileName.Substring(0, fileName.LastIndexOf('.'));
var pattern = @".*[A-z](?<width>[0-9]+)x(?<height>[0-9]+)";
var match = Regex.Match(fileStem, pattern);
if (match.Success)
{
ResetBinaryDetailsInputDialog(int.Parse(match.Groups["width"].Value), int.Parse(match.Groups["height"].Value));
}
else
{
ResetBinaryDetailsInputDialog();
}
var dialogResult = await BinaryDetailsInputDialog.ShowAsync();
if (dialogResult == ContentDialogResult.Primary &&
ParseBinaryDetailsSizeBoxes(out width, out height))
{
fileBitmap = CanvasBitmap.CreateFromBytes(_canvasDevice, buffer, width, height, format);
}
break;
default:
// open it with win2d
using (var stream = await file.OpenReadAsync())
{
fileBitmap = await CanvasBitmap.LoadAsync(_canvasDevice, stream);
}
break;
}
if (fileBitmap != null)
{
var size = fileBitmap.SizeInPixels;
var backgroundSurface = _compositionGraphics.CreateDrawingSurface2(
new SizeInt32()
{
Width = (int)size.Width, Height = (int)size.Height
},
DirectXPixelFormat.B8G8R8A8UIntNormalized,
DirectXAlphaMode.Premultiplied);
using (var drawingSession = CanvasComposition.CreateDrawingSession(backgroundSurface))
{
drawingSession.FillRectangle(0, 0, size.Width, size.Height, _backgroundCavnasBrush);
}
var imageSurface = _compositionGraphics.CreateDrawingSurface2(
new SizeInt32()
{
Width = (int)size.Width, Height = (int)size.Height
},
DirectXPixelFormat.B8G8R8A8UIntNormalized,
DirectXAlphaMode.Premultiplied);
using (var drawingSession = CanvasComposition.CreateDrawingSession(imageSurface))
{
drawingSession.Clear(Colors.Transparent);
drawingSession.DrawImage(fileBitmap);
}
_backgroundBrush.Surface = backgroundSurface;
_imageBrush.Surface = imageSurface;
ImageGrid.Width = size.Width;
ImageGrid.Height = size.Height;
ImageScrollViewer.ChangeView(0, 0, 1, true);
if (_borderEnabled)
{
ImageBorderBrush.Color = Colors.Black;
}
_currentFile = file;
_currentBitmap = fileBitmap;
}
}
public async Task OpenFileAsync(StorageFile file)
{
CanvasBitmap fileBitmap = null;
var extension = file.FileType;
switch (extension)
{
case ".bin":
var buffer = await FileIO.ReadBufferAsync(file);
var width = 0;
var height = 0;
var format = DirectXPixelFormat.B8G8R8A8UIntNormalized;
var dialogResult = await BinaryDetailsInputDialog.ShowAsync();
if (dialogResult == ContentDialogResult.Primary &&
ParseBinaryDetailsSizeBoxes(out width, out height))
{
fileBitmap = CanvasBitmap.CreateFromBytes(_canvasDevice, buffer, width, height, format);
}
break;
default:
// open it with win2d
using (var stream = await file.OpenReadAsync())
{
fileBitmap = await CanvasBitmap.LoadAsync(_canvasDevice, stream);
}
break;
}
if (fileBitmap != null)
{
var size = fileBitmap.SizeInPixels;
var backgroundSurface = _compositionGraphics.CreateDrawingSurface2(
new SizeInt32()
{
Width = (int)size.Width, Height = (int)size.Height
},
DirectXPixelFormat.B8G8R8A8UIntNormalized,
DirectXAlphaMode.Premultiplied);
using (var drawingSession = CanvasComposition.CreateDrawingSession(backgroundSurface))
{
drawingSession.FillRectangle(0, 0, size.Width, size.Height, _backgroundCavnasBrush);
}
var imageSurface = _compositionGraphics.CreateDrawingSurface2(
new SizeInt32()
{
Width = (int)size.Width, Height = (int)size.Height
},
DirectXPixelFormat.B8G8R8A8UIntNormalized,
DirectXAlphaMode.Premultiplied);
using (var drawingSession = CanvasComposition.CreateDrawingSession(imageSurface))
{
drawingSession.Clear(Colors.Transparent);
drawingSession.DrawImage(fileBitmap);
}
_backgroundBrush.Surface = backgroundSurface;
_imageBrush.Surface = imageSurface;
ImageGrid.Width = size.Width;
ImageGrid.Height = size.Height;
ImageScrollViewer.ChangeView(0, 0, 1, true);
if (_borderEnabled)
{
ImageBorderBrush.Color = Colors.Black;
}
_currentFile = file;
}
}
