// Currently, the dashed / dotted implementation only supports a single colour +
// single width, as that's currently required and supported on Android.
//
// Supporting individual widths + colours on each side is possible by modifying
// the current implementation. The idea is that we will draw four different lines
// and clip appropriately for each side (might require adjustment of phase so that
// they line up but even browsers don't do a good job at that).
//
// Firstly, create two paths for the outer and inner paths. The inner path is
// generated exactly the same way as the outer, just given an inset rect, derived
// from the insets on each side. Then clip using the odd-even rule
// (CGContextEOClip()). This will give us a nice rounded (possibly) clip mask.
//
// +----------------------------------+
// |@@@@@@@@ Clipped Space @@@@@@@@@|
// |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
// |@@+----------------------+@@@@@@@@|
// |@@| |@@@@@@@@|
// |@@| |@@@@@@@@|
// |@@| |@@@@@@@@|
// |@@+----------------------+@@@@@@@@|
// |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
// +----------------------------------+
//
// Afterwards, we create a clip path for each border side (CGContextSaveGState()
// and CGContextRestoreGState() when drawing each side). The clip mask for each
// segment is a trapezoid connecting corresponding edges of the inner and outer
// rects. For example, in the case of the top edge, the points would be:
// - (MinX(outer), MinY(outer))
// - (MaxX(outer), MinY(outer))
// - (MinX(inner) + topLeftRadius, MinY(inner) + topLeftRadius)
// - (MaxX(inner) - topRightRadius, MinY(inner) + topRightRadius)
//
// +------------------+
// |\ /|
// | \ / |
// | \ top / |
// | \ / |
// | \ / |
// | +------+ |
// | | | |
// | | | |
// | | | |
// |left | |right|
// | | | |
// | | | |
// | +------+ |
// | / \ |
// | / \ |
// | / \ |
// | / bottom \ |
// |/ \|
// +------------------+
//
//
// Note that this approach will produce discontinous colour changes at the edge
// (which is okay). The reason is that Quartz does not currently support drawing
// of gradients _along_ a path (NB: clipping a path and drawing a linear gradient
// is _not_ equivalent).
/*static void RCTGetDashedOrDottedBorderImage(uint borderStyle,
* RCTCornerRadii cornerRadii,
* CGSize viewSize,
* UIEdgeInsets borderInsets,
* RCTBorderColors borderColors,
* uint backgroundColor,
* bool drawToEdge)
* {
* // to be implement
* }*/
/// this is the API supported for RN parent image view invoke
void RCTGetBorderImage(RCTBorderStyle borderStyle,
CGSize viewSize,
RCTCornerRadii cornerRadii,
UIEdgeInsets borderInsets,
RCTBorderColors borderColors,
//uint backgroundColor,
Color backgroundColor,
bool drawToEdge)
{
Log.Info(ReactConstants.Tag, "[RCTGetBorderImage] ReactBorderDrawingManager::RCTGetBorderImage BGN ");
Log.Info(ReactConstants.Tag, "[RCTGetBorderImage] ReactBorderDrawingManager , borderStyle:" + borderStyle);
switch (borderStyle)
{
case RCTBorderStyle.RCTBorderStyleSolid:
//return RCTGetSolidBorderImage(cornerRadii, viewSize, borderInsets, borderColors, backgroundColor, drawToEdge);
RCTGetSolidBorderImage(cornerRadii, viewSize, borderInsets, borderColors, backgroundColor, drawToEdge);
break;
case RCTBorderStyle.RCTBorderStyleDashed:
case RCTBorderStyle.RCTBorderStyleDotted:
//return RCTGetDashedOrDottedBorderImage(borderStyle, cornerRadii, viewSize, borderInsets, borderColors, backgroundColor, drawToEdge);
break;
case RCTBorderStyle.RCTBorderStyleUnset:
break;
default:
break;
}
//return null;
}
bool RCTCornerRadiiAreEqual(RCTCornerRadii cornerRadii)
{
return
(Math.Abs(cornerRadii.topLeft - cornerRadii.topRight) < RCTViewBorderThreshold &&
Math.Abs(cornerRadii.topLeft - cornerRadii.bottomLeft) < RCTViewBorderThreshold &&
Math.Abs(cornerRadii.topLeft - cornerRadii.bottomRight) < RCTViewBorderThreshold);
}
static bool RCTCornerRadiiAreAboveThreshold(RCTCornerRadii cornerRadii)
{
return(cornerRadii.topLeft > RCTViewBorderThreshold ||
cornerRadii.topRight > RCTViewBorderThreshold ||
cornerRadii.bottomLeft > RCTViewBorderThreshold ||
cornerRadii.bottomRight > RCTViewBorderThreshold);
}
void RCTPathCreateOuterOutline(bool drawToEdge, CGRect rect, RCTCornerRadii cornerRadii)
{
if (drawToEdge)
{
Log.Info(ReactConstants.Tag, "[RCTPathCreateOuterOutline] ReactBorderDrawingManager , cairo:" + cairo);
Log.Info(ReactConstants.Tag, "[RCTPathCreateOuterOutline] rect.origin.x:" + rect.origin.x + ", rect.origin.y:" + rect.origin.y + ", rect.size.width:" + rect.size.width + ", rect.size.height:" + rect.size.height);
// add a new rectangle path here in cairo context
Cairo.cairo_rectangle(cairo, rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
pathOuter = Cairo.cairo_copy_path(cairo);
//Cairo.cairo_stroke(cairo);
return;
}
//RCTPathCreateWithRoundedRect(rect, RCTGetCornerInsets(cornerRadii, new UIEdgeInsets(0,0,0,0)));
pathOuter = RCTPathCreateWithRoundedRect(rect, RCTGetCornerInsets(cornerRadii, new UIEdgeInsets(0, 0, 0, 0)));
}
static RCTCornerInsets RCTGetCornerInsets(RCTCornerRadii cornerRadii,
UIEdgeInsets edgeInsets)
{
// calculate the corner rect inset
RCTCornerInsets cornerInsets;
cornerInsets.topLeft.width = Math.Max(0, cornerRadii.topLeft - edgeInsets.left);
cornerInsets.topLeft.height = Math.Max(0, cornerRadii.topLeft - edgeInsets.top);
cornerInsets.topRight.width = Math.Max(0, cornerRadii.topRight - edgeInsets.right);
cornerInsets.topRight.height = Math.Max(0, cornerRadii.topRight - edgeInsets.top);
cornerInsets.bottomLeft.width = Math.Max(0, cornerRadii.bottomLeft - edgeInsets.left);
cornerInsets.bottomLeft.height = Math.Max(0, cornerRadii.bottomLeft - edgeInsets.bottom);
cornerInsets.bottomRight.width = Math.Max(0, cornerRadii.bottomRight - edgeInsets.right);
cornerInsets.bottomRight.height = Math.Max(0, cornerRadii.bottomRight - edgeInsets.bottom);
return(cornerInsets);
}
void RCTGetSolidBorderImage(RCTCornerRadii cornerRadii,
CGSize viewSize,
UIEdgeInsets borderInsets,
RCTBorderColors borderColors,
//uint backgroundColor,
Color backgroundColor,
bool drawToEdge)
{
bool hasCornerRadii = RCTCornerRadiiAreAboveThreshold(cornerRadii);
RCTCornerInsets cornerInsets = RCTGetCornerInsets(cornerRadii, borderInsets);
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::RCTGetSolidBorderImage BGN ");
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , hasCornerRadii:" + hasCornerRadii);
bool makeStretchable =
(borderInsets.left + cornerInsets.topLeft.width +
borderInsets.right + cornerInsets.bottomRight.width <= viewSize.width) &&
(borderInsets.left + cornerInsets.bottomLeft.width +
borderInsets.right + cornerInsets.topRight.width <= viewSize.width) &&
(borderInsets.top + cornerInsets.topLeft.height +
borderInsets.bottom + cornerInsets.bottomRight.height <= viewSize.height) &&
(borderInsets.top + cornerInsets.topRight.height +
borderInsets.bottom + cornerInsets.bottomLeft.height <= viewSize.height);
UIEdgeInsets edgeInsets = new UIEdgeInsets
(
borderInsets.top + Math.Max(cornerInsets.topLeft.height, cornerInsets.topRight.height),
borderInsets.left + Math.Max(cornerInsets.topLeft.width, cornerInsets.bottomLeft.width),
borderInsets.bottom + Math.Max(cornerInsets.bottomLeft.height, cornerInsets.bottomRight.height),
borderInsets.right + Math.Max(cornerInsets.bottomRight.width, cornerInsets.topRight.width)
);
makeStretchable = false;
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , makeStretchable:" + makeStretchable);
CGSize sizeStretch = new CGSize
(
// 1pt for the middle stretchable area along each axis
edgeInsets.left + 1 + edgeInsets.right,
edgeInsets.top + 1 + edgeInsets.bottom
);
//CGSize size = makeStretchable ? sizeStretch: viewSize;
CGSize size = viewSize;
// begin libCairo engine drawing context
RCTUIGraphicsBeginImageContext(size, backgroundColor, hasCornerRadii, drawToEdge);
CGRect rect = new CGRect((new CGPoint(0, 0)), size);
RCTPathCreateOuterOutline(drawToEdge, rect, cornerRadii);
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , backgroundColor.IsDefault:" + backgroundColor.IsDefault);
if (!backgroundColor.IsDefault)
{
// paint the background color here
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::Fill the background Color! ");
RCTContextSetFillColorWithColor(cairo, backgroundColor);
//RCTContextSetFillColorWithUint(cairo, backgroundColor);
Cairo.cairo_fill(cairo);
}
// for Cairo instead, draw rounded Rectangle path here
Cairo.cairo_append_path(cairo, pathOuter);
pathInner = RCTPathCreateWithRoundedRect(UIEdgeInsetsInsetRect(rect, borderInsets), cornerInsets);
//Cairo.cairo_append_path(cairo, pathInner);
/// Clip the outerpath with inner path by eod rule..
Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_EVEN_ODD);
//Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_WINDING);
Cairo.cairo_clip(cairo);
RCTContextSetFillColorWithUint(cairo, borderColors.left);
Cairo.cairo_paint(cairo);
bool hasEqualColors = RCTBorderColorsAreEqual(borderColors);
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] drawToEdge:" + drawToEdge + ", hasCornerRadii:" + hasCornerRadii + ", hasEqualColors:" + hasEqualColors);
if ((drawToEdge || !hasCornerRadii) && hasEqualColors)
{
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] rect.origin.x:" + rect.origin.x + ", rect.origin.y:" + rect.origin.y + ", rect.size.width:" + rect.size.width + ", rect.size.height:" + rect.size.height);
RCTContextSetFillColorWithUint(cairo, borderColors.left);
Cairo.cairo_paint(cairo);
}
else
{
if ((hasCornerRadii))
{
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager-->not support different color for rounded rectangle! ");
RCTContextSaveCurrentImage();
return;
}
CGPoint topLeft = new CGPoint(borderInsets.left, borderInsets.top);
if (cornerInsets.topLeft.width > 0 && cornerInsets.topLeft.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect tl = new CGRect
(
topLeft, new CGSize(2 * cornerInsets.topLeft.width, 2 * cornerInsets.topLeft.height)
);
RCTEllipseGetIntersectionsWithLine(tl, CGPointZero, topLeft, points);
if (!Single.IsNaN(points[1].x) && !Single.IsNaN(points[1].y))
{
topLeft = points[1];
}
}
CGPoint bottomLeft = new CGPoint(borderInsets.left, size.height - borderInsets.bottom);
if (cornerInsets.bottomLeft.width > 0 && cornerInsets.bottomLeft.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect bl = new CGRect
(
new CGPoint(bottomLeft.x, bottomLeft.y - 2 * cornerInsets.bottomLeft.height),
new CGSize(2 * cornerInsets.bottomLeft.width, 2 * cornerInsets.bottomLeft.height)
);
CGPoint ble = new CGPoint(0, size.height);
RCTEllipseGetIntersectionsWithLine(bl, ble, bottomLeft, points);
if (!Single.IsNaN(points[1].x) && !Single.IsNaN(points[1].y))
{
bottomLeft = points[1];
}
}
CGPoint topRight = new CGPoint(size.width - borderInsets.right, borderInsets.top);
if (cornerInsets.topRight.width > 0 && cornerInsets.topRight.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect tr = new CGRect
(
new CGPoint(topRight.x - 2 * cornerInsets.topRight.width, topRight.y),
new CGSize(2 * cornerInsets.topRight.width, 2 * cornerInsets.topRight.height)
);
CGPoint tre = new CGPoint(size.width, 0);
RCTEllipseGetIntersectionsWithLine(tr, tre, topRight, points);
if (!Single.IsNaN(points[0].x) && !Single.IsNaN(points[0].y))
{
topRight = points[0];
}
}
CGPoint bottomRight = new CGPoint(size.width - borderInsets.right, size.height - borderInsets.bottom);
if (cornerInsets.bottomRight.width > 0 && cornerInsets.bottomRight.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect br = new CGRect
(
new CGPoint(bottomRight.x - 2 * cornerInsets.bottomRight.width, bottomRight.y - 2 * cornerInsets.bottomRight.height),
new CGSize(2 * cornerInsets.bottomRight.width, 2 * cornerInsets.bottomRight.height)
);
CGPoint bre = new CGPoint(size.width, size.height);
RCTEllipseGetIntersectionsWithLine(br, bre, bottomRight, points);
if (!Single.IsNaN(points[0].x) && !Single.IsNaN(points[0].y))
{
bottomRight = points[0];
}
}
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::RCTGetSolidBorderImage BGN Draw each colored Edge!");
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] borderInsets.right:" + borderInsets.right + ", borderInsets.bottom:" + borderInsets.bottom + ", borderInsets.left:" + borderInsets.left + ", borderInsets.top:" + borderInsets.top);
uint currentColor = 0;
//Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_WINDING);
// RIGHT
if (borderInsets.right > 0)
{
CGPoint[] points =
{
new CGPoint(size.width, 0),
topRight,
bottomRight,
new CGPoint(size.width, size.height),
};
currentColor = borderColors.right;
RCTContextAddLines(cairo, points, 4);
}
// BOTTOM
if (borderInsets.bottom > 0)
{
CGPoint[] points =
{
new CGPoint(0, size.height),
bottomLeft,
bottomRight,
new CGPoint(size.width, size.height),
};
if (!(currentColor == borderColors.bottom))
{
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
currentColor = borderColors.bottom;
}
RCTContextAddLines(cairo, points, 4);
}
// LEFT
if (borderInsets.left > 0)
{
CGPoint[] points =
{
CGPointZero,
topLeft,
bottomLeft,
new CGPoint(0,size.height),
};
if (!(currentColor == borderColors.left))
{
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
currentColor = borderColors.left;
}
RCTContextAddLines(cairo, points, 4);
}
// TOP
if (borderInsets.top > 0)
{
CGPoint[] points =
{
CGPointZero,
topLeft,
topRight,
new CGPoint(size.width, 0),
};
if (!(currentColor == borderColors.top))
{
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
currentColor = borderColors.top;
}
RCTContextAddLines(cairo, points, 4);
}
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
}
RCTContextSaveCurrentImage();
return;
}