Ejemplo n.º 1
0
        protected override SizeF CalculateInnerDesiredSize(SizeF totalSize)
        {
            ImageSourceState allocatedSource = GetLoadedSource(false);

            if (allocatedSource == null)
            {
                _lastImageSourceSize = SizeF.Empty;
                return(new SizeF(10, 10));
            }

            SizeF imageSize        = allocatedSource.ImageSource.SourceSize;
            float sourceFrameRatio = imageSize.Width / imageSize.Height;

            // Adaptions when available size is not specified in any direction(s)
            if (double.IsNaN(totalSize.Width) && double.IsNaN(totalSize.Height))
            {
                totalSize = imageSize;
            }
            else if (double.IsNaN(totalSize.Height))
            {
                totalSize.Height = totalSize.Width / sourceFrameRatio;
            }
            else if (double.IsNaN(totalSize.Width))
            {
                totalSize.Width = totalSize.Height * sourceFrameRatio;
            }

            _lastImageSourceSize = imageSize;
            return(allocatedSource.ImageSource.StretchSource(totalSize, imageSize, Stretch, StretchDirection));
        }
Ejemplo n.º 2
0
        protected ImageSourceState GetLoadedSource(bool invalidateLayout)
        {
            if (_loadImageSource)
            {
                DisposeImageSources();
                _fallbackSourceInUse = false;
                _loadImageSource     = false;
            }

            ImageSourceState allocatedSource = null;

            // Find a new image source
            if (_sourceState.ImageSource == null)
            {
                _sourceState.ImageSource = LoadImageSource(Source, true);
                _sourceState.Setup       = false;
            }

            if (_sourceState.ImageSource != null && !_sourceState.ImageSource.IsAllocated)
            {
                _sourceState.Setup = false;
                _sourceState.ImageSource.Allocate();
            }

            if (_sourceState.ImageSource != null && _sourceState.ImageSource.IsAllocated)
            {
                allocatedSource = _sourceState;
            }
            else
            {
                // If the source image could not load yet, try fallback image
                if (_fallbackSourceState.ImageSource == null)
                {
                    _fallbackSourceState.ImageSource = LoadImageSource(FallbackSource, false);
                    _fallbackSourceState.Setup       = false;
                }

                if (_fallbackSourceState.ImageSource != null && !_fallbackSourceState.ImageSource.IsAllocated)
                {
                    _fallbackSourceState.Setup = false;
                    _fallbackSourceState.ImageSource.Allocate();
                }

                if (_fallbackSourceState.ImageSource != null && _fallbackSourceState.ImageSource.IsAllocated)
                {
                    _fallbackSourceInUse = true;
                    allocatedSource      = _fallbackSourceState;
                }
            }

            if (invalidateLayout && allocatedSource != null && allocatedSource.ImageSource.SourceSize != _lastImageSourceSize)
            {
                InvalidateLayout(true, true);
            }
            HasImage = allocatedSource != null;

            return(allocatedSource);
        }
Ejemplo n.º 3
0
        public override void RenderOverride(RenderContext localRenderContext)
        {
            ImageSourceState allocatedSource = GetLoadedSource(true);

            if (allocatedSource == null)
            {
                base.RenderOverride(localRenderContext);
            }
            else
            {
                // Update source geometry if necessary (source has changed, layout has changed).
                if (!allocatedSource.Setup)
                {
                    allocatedSource.ImageSource.Setup(_innerRect, localRenderContext.ZOrder, SkinNeutralAR);
                    allocatedSource.Setup = true;
                }
                base.RenderOverride(localRenderContext);
                allocatedSource.ImageSource.Render(localRenderContext, Stretch, StretchDirection);
            }
        }