// Generates the clipping region for an element.
bool ElementUtilities::GetClippingRegion(Vector2i& clip_origin, Vector2i& clip_dimensions, Element* element)
{
clip_origin = Vector2i(-1, -1);
clip_dimensions = Vector2i(-1, -1);
int num_ignored_clips = element->GetClippingIgnoreDepth();
if (num_ignored_clips < 0)
return false;
// Search through the element's ancestors, finding all elements that clip their overflow and have overflow to clip.
// For each that we find, we combine their clipping region with the existing clipping region, and so build up a
// complete clipping region for the element.
Element* clipping_element = element->GetParentNode();
while (clipping_element != NULL)
{
// Merge the existing clip region with the current clip region if we aren't ignoring clip regions.
if (num_ignored_clips == 0 && clipping_element->IsClippingEnabled())
{
Vector2f element_origin_f = clipping_element->GetAbsoluteOffset(Box::CONTENT);
Vector2f element_dimensions_f = clipping_element->GetBox().GetSize(Box::CONTENT);
Vector2i element_origin(Math::RealToInteger(element_origin_f.x), Math::RealToInteger(element_origin_f.y));
Vector2i element_dimensions(Math::RealToInteger(element_dimensions_f.x), Math::RealToInteger(element_dimensions_f.y));
if (clip_dimensions == Vector2i(-1, -1))
{
clip_origin = element_origin;
clip_dimensions = element_dimensions;
}
else
{
Vector2i top_left(Math::Max(clip_origin.x, element_origin.x),
Math::Max(clip_origin.y, element_origin.y));
Vector2i bottom_right(Math::Min(clip_origin.x + clip_dimensions.x, element_origin.x + element_dimensions.x),
Math::Min(clip_origin.y + clip_dimensions.y, element_origin.y + element_dimensions.y));
clip_origin = top_left;
clip_dimensions.x = Math::Max(0, bottom_right.x - top_left.x);
clip_dimensions.y = Math::Max(0, bottom_right.y - top_left.y);
}
}
// If this region is meant to clip and we're skipping regions, update the counter.
if (num_ignored_clips > 0)
{
if (clipping_element->IsClippingEnabled())
num_ignored_clips--;
}
// Determine how many clip regions this ancestor ignores, and inherit the value. If this region ignores all
// clipping regions, then we do too.
int clipping_element_ignore_clips = clipping_element->GetClippingIgnoreDepth();
if (clipping_element_ignore_clips < 0)
break;
num_ignored_clips = Math::Max(num_ignored_clips, clipping_element_ignore_clips);
// Climb the tree to this region's parent.
clipping_element = clipping_element->GetParentNode();
}
return clip_dimensions.x >= 0 && clip_dimensions.y >= 0;
}
// Generates the clipping region for an element.
bool ElementUtilities::GetClippingRegion(Vector2i& clip_origin, Vector2i& clip_dimensions, Element* element)
{
clip_origin = Vector2i(-1, -1);
clip_dimensions = Vector2i(-1, -1);
int num_ignored_clips = element->GetClippingIgnoreDepth();
if (num_ignored_clips < 0)
return false;
// Search through the element's ancestors, finding all elements that clip their overflow and have overflow to clip.
// For each that we find, we combine their clipping region with the existing clipping region, and so build up a
// complete clipping region for the element.
Element* clipping_element = element->GetParentNode();
while (clipping_element != NULL)
{
// Merge the existing clip region with the current clip region if we aren't ignoring clip regions.
if (num_ignored_clips == 0 && clipping_element->IsClippingEnabled())
{
// Ignore nodes that don't clip.
if (clipping_element->GetClientWidth() < clipping_element->GetScrollWidth()
|| clipping_element->GetClientHeight() < clipping_element->GetScrollHeight())
{
Vector2f element_origin_f = clipping_element->GetAbsoluteOffset(Box::CONTENT);
Vector2f element_dimensions_f = clipping_element->GetBox().GetSize(Box::CONTENT);
Vector2i element_origin(Math::RealToInteger(element_origin_f.x), Math::RealToInteger(element_origin_f.y));
Vector2i element_dimensions(Math::RealToInteger(element_dimensions_f.x), Math::RealToInteger(element_dimensions_f.y));
bool clip_x = element->GetProperty(OVERFLOW_X)->Get< int >() != OVERFLOW_VISIBLE;
bool clip_y = element->GetProperty(OVERFLOW_Y)->Get< int >() != OVERFLOW_VISIBLE;
ROCKET_ASSERT(!clip_x || !clip_y || (clip_x && clip_y));
//TODO: REPLACE FOLLOWING BUG FIX FOR OVERFLOW
if( !( clip_x && clip_y ) )
{
clip_x = true;
clip_y = true;
}
//END TODO
if (!clip_x)
{
element_origin.x = 0;
element_dimensions.x = clip_dimensions.x < 0 ? element->GetContext()->GetDimensions().x : clip_dimensions.x;
}
else if (!clip_y)
{
element_origin.y = 0;
element_dimensions.y = clip_dimensions.y < 0 ? element->GetContext()->GetDimensions().y : clip_dimensions.y;
}
if (clip_dimensions == Vector2i(-1, -1))
{
clip_origin = element_origin;
clip_dimensions = element_dimensions;
}
else
{
Vector2i top_left(Math::Max(clip_origin.x, element_origin.x),
Math::Max(clip_origin.y, element_origin.y));
Vector2i bottom_right(Math::Min(clip_origin.x + clip_dimensions.x, element_origin.x + element_dimensions.x),
Math::Min(clip_origin.y + clip_dimensions.y, element_origin.y + element_dimensions.y));
clip_origin = top_left;
clip_dimensions.x = Math::Max(0, bottom_right.x - top_left.x);
clip_dimensions.y = Math::Max(0, bottom_right.y - top_left.y);
}
}
}
// If this region is meant to clip and we're skipping regions, update the counter.
if (num_ignored_clips > 0)
{
if (clipping_element->IsClippingEnabled())
num_ignored_clips--;
}
// Determine how many clip regions this ancestor ignores, and inherit the value. If this region ignores all
// clipping regions, then we do too.
int clipping_element_ignore_clips = clipping_element->GetClippingIgnoreDepth();
if (clipping_element_ignore_clips < 0)
break;
num_ignored_clips = Math::Max(num_ignored_clips, clipping_element_ignore_clips);
// Climb the tree to this region's parent.
clipping_element = clipping_element->GetParentNode();
}
return clip_dimensions.x >= 0 && clip_dimensions.y >= 0;
}
