// Updates the position of the document based on the style properties.
void ElementDocument::UpdatePosition()
{
// We are only positioned relative to our parent, so if we're not parented we may as well bail now.
if (GetParentNode() == NULL)
return;
Vector2f position;
// Work out our containing block; relative offsets are calculated against it.
Vector2f containing_block = GetParentNode()->GetBox().GetSize(Box::CONTENT);
const Property *left = GetLocalProperty(LEFT);
const Property *right = GetLocalProperty(RIGHT);
if (left != NULL && left->unit != Property::KEYWORD)
position.x = ResolveProperty(LEFT, containing_block.x);
else if (right != NULL && right->unit != Property::KEYWORD)
position.x = (containing_block.x - GetBox().GetSize(Box::MARGIN).x) - ResolveProperty(RIGHT, containing_block.x);
else
position.x = GetBox().GetEdge(Box::MARGIN, Box::LEFT);
const Property *top = GetLocalProperty(TOP);
const Property *bottom = GetLocalProperty(BOTTOM);
if (top != NULL && top->unit != Property::KEYWORD)
position.y = ResolveProperty(TOP, containing_block.y);
else if (bottom != NULL && bottom->unit != Property::KEYWORD)
position.y = (containing_block.y - GetBox().GetSize(Box::MARGIN).y) - ResolveProperty(BOTTOM, containing_block.y);
else
position.y = GetBox().GetEdge(Box::MARGIN, Box::TOP);
SetOffset(position, NULL);
}
// Returns one of this element's properties.
const Property* ElementStyle::GetProperty(const String& name)
{
const Property* local_property = GetLocalProperty(name);
if (local_property != NULL)
return local_property;
// Fetch the property specification.
const PropertyDefinition* property = StyleSheetSpecification::GetProperty(name);
if (property == NULL)
return NULL;
// If we can inherit this property, return our parent's property.
if (property->IsInherited())
{
Element* parent = element->GetParentNode();
while (parent != NULL)
{
const Property* parent_property = parent->style->GetLocalProperty(name);
if (parent_property)
return parent_property;
parent = parent->GetParentNode();
}
}
// No property available! Return the default value.
return property->GetDefaultValue();
}
void ElementImage::GenerateGeometry()
{
// Release the old geometry before specifying the new vertices.
geometry.Release(true);
std::vector< Rocket::Core::Vertex >& vertices = geometry.GetVertices();
std::vector< int >& indices = geometry.GetIndices();
vertices.resize(4);
indices.resize(6);
// Generate the texture coordinates.
Vector2f texcoords[2];
if (using_coords)
{
Vector2f texture_dimensions((float) texture.GetDimensions(GetRenderInterface()).x, (float) texture.GetDimensions(GetRenderInterface()).y);
if (texture_dimensions.x == 0)
texture_dimensions.x = 1;
if (texture_dimensions.y == 0)
texture_dimensions.y = 1;
texcoords[0].x = (float) coords[0] / texture_dimensions.x;
texcoords[0].y = (float) coords[1] / texture_dimensions.y;
texcoords[1].x = (float) coords[2] / texture_dimensions.x;
texcoords[1].y = (float) coords[3] / texture_dimensions.y;
}
else
{
texcoords[0] = Vector2f(0, 0);
texcoords[1] = Vector2f(1, 1);
}
Colourb colour(255, 255,255,255);
const Property* property = GetLocalProperty(COLOR);
if (property)
colour = property->value.Get<Colourb>();
Rocket::Core::GeometryUtilities::GenerateQuad(&vertices[0], // vertices to write to
&indices[0], // indices to write to
Vector2f(0, 0), // origin of the quad
GetBox().GetSize(Rocket::Core::Box::CONTENT), // size of the quad
colour, // colour of the vertices
texcoords[0], // top-left texture coordinate
texcoords[1]); // top-right texture coordinate
geometry_dirty = false;
}
// Resolves one of this element's properties.
float ElementStyle::ResolveProperty(const String& name, float base_value)
{
const Property* property = GetProperty(name);
if (!property)
{
ROCKET_ERROR;
return 0.0f;
}
if (property->unit & Property::RELATIVE_UNIT)
{
// The calculated value of the font-size property is inherited, so we need to check if this
// is an inherited property. If so, then we return our parent's font size instead.
if (name == FONT_SIZE)
{
Rocket::Core::Element* parent = element->GetParentNode();
if (parent == NULL)
return 0;
if (GetLocalProperty(FONT_SIZE) == NULL)
return parent->ResolveProperty(FONT_SIZE, 0);
// The base value for font size is always the height of *this* element's parent's font.
base_value = parent->ResolveProperty(FONT_SIZE, 0);
}
if (property->unit & Property::PERCENT)
return base_value * property->value.Get< float >() * 0.01f;
else if (property->unit & Property::EM)
{
// If an em-relative font size is specified, it is expressed relative to the parent's
// font height.
if (name == FONT_SIZE)
return property->value.Get< float >() * base_value;
else
return property->value.Get< float >() * ElementUtilities::GetFontSize(element);
}
}
if (property->unit & Property::NUMBER || property->unit & Property::PX)
{
return property->value.Get< float >();
}
// We're not a numeric property; return 0.
return 0.0f;
}
// Sets a list of our potentially inherited properties as dirtied by an ancestor.
void ElementStyle::DirtyInheritedProperties(const PropertyNameList& properties)
{
PropertyNameList inherited_properties;
for (PropertyNameList::const_iterator i = properties.begin(); i != properties.end(); ++i)
{
if (GetLocalProperty((*i)) == NULL)
inherited_properties.insert(*i);
}
if (inherited_properties.empty())
return;
// Pass the list of those properties that this element doesn't override onto our children.
for (int i = 0; i < element->GetNumChildren(true); i++)
element->GetChild(i)->GetStyle()->DirtyInheritedProperties(inherited_properties);
element->OnPropertyChange(properties);
}
// Sets a list of our potentially inherited properties as dirtied by an ancestor.
void ElementStyle::DirtyInheritedProperties(const PropertyNameList& properties)
{
bool clear_em_properties = em_properties != NULL;
PropertyNameList inherited_properties;
for (PropertyNameList::const_iterator i = properties.begin(); i != properties.end(); ++i)
{
const Property *property = GetLocalProperty((*i));
if (property == NULL)
{
inherited_properties.insert(*i);
if (!clear_em_properties && em_properties != NULL && em_properties->find((*i)) != em_properties->end()) {
clear_em_properties = true;
}
}
}
if (inherited_properties.empty())
return;
// clear the list of EM-properties, we will refill it in DirtyEmProperties
if (clear_em_properties && em_properties != NULL)
{
delete em_properties;
em_properties = NULL;
}
// Clear cached inherited properties.
cache->ClearInherited();
// Pass the list of those properties that this element doesn't override onto our children.
for (int i = 0; i < element->GetNumChildren(true); i++)
element->GetChild(i)->GetStyle()->DirtyInheritedProperties(inherited_properties);
element->OnPropertyChange(properties);
}
// Resolves one of this element's properties.
float ElementStyle::ResolveProperty(const String& name, float base_value)
{
const Property* property = GetProperty(name);
if (!property)
{
ROCKET_ERROR;
return 0.0f;
}
if (property->unit & Property::RELATIVE_UNIT)
{
// The calculated value of the font-size property is inherited, so we need to check if this
// is an inherited property. If so, then we return our parent's font size instead.
if (name == FONT_SIZE)
{
// If the rem unit is used, the font-size is inherited directly from the document,
// otherwise we use the parent's font size.
if (property->unit & Property::REM)
{
Rocket::Core::ElementDocument* owner_document = element->GetOwnerDocument();
if (owner_document == NULL)
return 0;
base_value = element->GetOwnerDocument()->ResolveProperty(FONT_SIZE, 0);
}
else
{
Rocket::Core::Element* parent = element->GetParentNode();
if (parent == NULL)
return 0;
if (GetLocalProperty(FONT_SIZE) == NULL)
return parent->ResolveProperty(FONT_SIZE, 0);
// The base value for font size is always the height of *this* element's parent's font.
base_value = parent->ResolveProperty(FONT_SIZE, 0);
}
}
if (property->unit & Property::PERCENT)
return base_value * property->value.Get< float >() * 0.01f;
else if (property->unit & Property::EM)
{
// If an em-relative font size is specified, it is expressed relative to the parent's
// font height.
if (name == FONT_SIZE)
return property->value.Get< float >() * base_value;
else
return property->value.Get< float >() * ElementUtilities::GetFontSize(element);
}
else if (property->unit & Property::REM)
{
// If an rem-relative font size is specified, it is expressed relative to the document's
// font height.
if (name == FONT_SIZE)
return property->value.Get< float >() * base_value;
else
return property->value.Get< float >() * ElementUtilities::GetFontSize(element->GetOwnerDocument());
}
}
if (property->unit & Property::NUMBER || property->unit & Property::PX)
{
return property->value.Get< float >();
}
// Values based on pixels-per-inch.
if (property->unit & Property::PPI_UNIT)
{
float inch = property->value.Get< float >() * element->GetRenderInterface()->GetPixelsPerInch();
if (property->unit & Property::INCH) // inch
return inch;
if (property->unit & Property::CM) // centimeter
return inch / 2.54f;
if (property->unit & Property::MM) // millimeter
return inch / 25.4f;
if (property->unit & Property::PT) // point
return inch / 72.0f;
if (property->unit & Property::PC) // pica
return inch / 6.0f;
}
// We're not a numeric property; return 0.
return 0.0f;
}
