public override void Arrange <TRenderSize>(TRenderSize availableSpace,
IRenderContext renderContext)
{
if (!TryGetImage(availableSpace, out var img))
{
return;
}
ValueRectangle rect;
if ((!availableSpace.Width.AreEqualEnough(img.Width) ||
!availableSpace.Height.AreEqualEnough(availableSpace.Height)) &&
availableSpace.Height < img.Height)
{
var scale = availableSpace.Height / img.Height;
rect = new ValueRectangle(ValuePoint2D.Empty,
new ValueRenderSize(img.Width * scale, availableSpace.Height,
availableSpace.Offset));
//availableSpace = new ValueRenderSize(img.Width * scale, availableSpace.Height,
// availableSpace.Offset);
}
else
{
rect = new ValueRectangle(ValuePoint2D.Empty, availableSpace);
}
renderContext.DrawImage(img, rect);
}
protected override void OnMeasure(Int32 widthMeasureSpec,
Int32 heightMeasureSpec)
{
base.OnMeasure(widthMeasureSpec, heightMeasureSpec);
var w = MeasuredWidth;
var h = MeasuredHeight;
var sz = new ValueRenderSize(w, h);
_measureContext.MeasureMainView(_view, sz, _viewState);
_targetRect = new ValueRectangle(
0, // X
0, // Y
sz.Width / _viewState.ZoomLevel,
sz.Height / _viewState.ZoomLevel);
}
public void DrawString <TBrush, TPoint>(String text,
TBrush brush,
TPoint point2D)
where TBrush : IBrush
where TPoint : IPoint2D
{
if (_isCacheStaticLayouts)
{
var layout = GetOrCreateStaticLayout(text);
DrawStringWithCachedLayout(brush, point2D.X, point2D.Y, layout);
return;
}
var size = MeasureString(text);
var test = new ValueRectangle(point2D, size.Width, size.Height);
DrawStringInRect(text, brush, test);
}
protected override void OnMeasure(Int32 widthMeasureSpec,
Int32 heightMeasureSpec)
{
base.OnMeasure(widthMeasureSpec, heightMeasureSpec);
var w = MeasuredWidth;
var h = MeasuredHeight;
var sz = new ValueRenderSize(w, h);
_targetRect = new ValueRectangle(
0, // X
0, // Y
sz.Width / ZoomLevel,
sz.Height / ZoomLevel);
var count = ChildCount;
for (var c = 0; c < count; c++)
{
var current = GetChildAt(c);
if (current is IVisualSurrogate)
{
current.Measure(Convert.ToInt32(_targetRect.Width),
Convert.ToInt32(_targetRect.Height));
}
else
{
current?.Measure(widthMeasureSpec, heightMeasureSpec);
}
}
_measured = new ValueSize(sz.Width, sz.Height);
RenderKit.MeasureContext.MeasureMainView(_view, sz, _viewState);
if (_refreshLoopCount == 0)
{
_refreshLoopCount++;
var _ = RefreshLoop();
}
}
private void OnHostSizeChanged(ISize newValue)
{
lock (_lock)
{
if (newValue.IsEmpty)
{
return;
}
_hostRect = new ValueRectangle(0, 0, newValue);
_gdiDevice.UpdateSize(newValue);
var view = _viewHost.View;
if (view == null)
{
return;
}
view.InvalidateMeasure();
}
}
public BitmapRenderer(IViewHost <Bitmap> viewHost,
GdiMeasureContext measureContext,
GdiRenderContext renderContext,
Color backgroundColor)
{
_eventLock = new Object();
_lock = new Object();
_viewHost = viewHost;
_visualHost = viewHost;
_visualHost.AvailableSizeChanged += OnHostSizeChanged;
_measureContext = measureContext;
_renderContext = renderContext;
_layoutQueue = measureContext.LayoutQueue;
_gdiDevice = new GdiDevice(backgroundColor,
_viewHost.AvailableSize);
_renderRect = new Rectangle(0, 0, 1, 1);
_hostRect = new ValueRectangle(0, 0, viewHost.AvailableSize);
}
