void BackdropNodeGadget::doRender( const Style *style ) const
{
// this is our bound in gadget space
Box2f bound = boundPlug()->getValue();
// but because we're going to draw our contents at an arbitrary scale,
// we need to compute a modified bound which will be in the right place
// following scaling.
const Backdrop *backdrop = static_cast<const Backdrop *>( node() );
const float scale = backdrop->scalePlug()->getValue();
bound.min /= scale;
bound.max /= scale;
glPushMatrix();
glScalef( scale, scale, scale );
const Box3f titleCharacterBound = style->characterBound( Style::HeadingText );
const float titleBaseline = bound.max.y - g_margin - titleCharacterBound.max.y;
if( IECoreGL::Selector::currentSelector() )
{
// when selecting we render in a simplified form.
// we only draw a thin strip around the edge of the backdrop
// to allow the edges to be grabbed for dragging, and a strip
// at the top to allow the title header to be grabbed for moving
// around. leaving the main body of the backdrop as a hole is
// necessary to allow the GraphGadget to continue to perform
// drag selection on the nodes on top of the backdrop.
const float width = hoverWidth() / scale;
style->renderSolidRectangle( Box2f( bound.min, V2f( bound.min.x + width, bound.max.y ) ) ); // left
style->renderSolidRectangle( Box2f( V2f( bound.max.x - width, bound.min.y ), bound.max ) ); // right
style->renderSolidRectangle( Box2f( bound.min, V2f( bound.max.x, bound.min.y + width ) ) ); // bottom
style->renderSolidRectangle( Box2f( V2f( bound.min.x, bound.max.y - width ), bound.max ) ); // top
style->renderSolidRectangle( Box2f( V2f( bound.min.x, titleBaseline - g_margin ), bound.max ) ); // heading
}
else
{
// normal drawing mode
style->renderBackdrop( bound, getHighlighted() ? Style::HighlightedState : Style::NormalState );
const std::string title = backdrop->titlePlug()->getValue();
if( title.size() )
{
Box3f titleBound = style->textBound( Style::HeadingText, title );
glPushMatrix();
glTranslatef( bound.center().x - titleBound.size().x / 2.0f, titleBaseline, 0.0f );
style->renderText( Style::HeadingText, title );
glPopMatrix();
}
if( m_hovered )
{
style->renderHorizontalRule(
V2f( bound.center().x, titleBaseline - g_margin / 2.0f ),
bound.size().x - g_margin * 2.0f,
Style::HighlightedState
);
}
Box2f textBound = bound;
textBound.min += V2f( g_margin );
textBound.max = V2f( textBound.max.x - g_margin, titleBaseline - g_margin );
if( textBound.hasVolume() )
{
std::string description = backdrop->descriptionPlug()->getValue();
style->renderWrappedText( Style::BodyText, description, textBound );
}
}
glPopMatrix();
}
