void CAniVScroller::AnimateLinearScroll (Metric rRate)
// AnimateLinearScroll
//
// Sets an animation timeline to scroll through all lines
{
CLinearMetric *pScroller = new CLinearMetric;
Metric cyViewport = m_Properties[INDEX_VIEWPORT_HEIGHT].GetMetric();
pScroller->SetParams(-cyViewport, m_cyEnd, rRate);
AnimateProperty(PROP_SCROLL_POS, pScroller);
}
void CTextCrawlSession::CreateCrawlAnimation (const CString &sText, const RECT &rcRect, IAnimatron **retpAni)
// CreateCrawlAnimation
//
// Creates the prologue and epilogue animation
{
int i;
const CVisualPalette &VI = m_HI.GetVisuals();
const CG16bitFont &SubTitleFont = VI.GetFont(fontSubTitle);
CG32bitPixel rgbColor = VI.GetColor(colorTextAltHighlight);
// Adjust because scroller does not clip at the bottom
int cyHeight = RectHeight(rcRect) - SubTitleFont.GetHeight();
// Create a scroller
CAniVScroller *pAni = new CAniVScroller;
pAni->SetPropertyVector(PROP_POSITION, CVector((Metric)rcRect.left, (Metric)rcRect.top));
pAni->SetPropertyMetric(PROP_VIEWPORT_HEIGHT, (Metric)cyHeight);
pAni->SetPropertyMetric(PROP_FADE_EDGE_HEIGHT, (Metric)(cyHeight / 8));
// Add the text
TArray<CString> Lines;
SubTitleFont.BreakText(sText, RectWidth(rcRect), &Lines);
for (i = 0; i < Lines.GetCount(); i++)
{
IAnimatron *pText;
CAniText::Create(Lines[i],
CVector(0.0, pAni->GetHeight()),
&SubTitleFont,
0,
rgbColor,
&pText);
pAni->AddLine(pText);
}
// Scroll from the bottom until the text is centered.
// Compute the center position (remember that coordinates are cartessian; down is negative)
int yPos = -((RectHeight(rcRect) - (SubTitleFont.GetHeight() * Lines.GetCount())) / 2);
CLinearMetric *pScroller = new CLinearMetric;
pScroller->SetParams(-cyHeight, yPos, CRAWL_SPEED);
pScroller->AddListener(EVENT_ON_ANIMATION_DONE, this, CMD_SHOW_OK_BUTTON);
pAni->AnimateProperty(PROP_SCROLL_POS, pScroller, 0);
// After the scrolling is done, fade-out
CLinearFade *pFader = new CLinearFade;
pFader->SetParams(pScroller->GetDuration() + CRAWL_DURATION, 0, 30);
pAni->AnimateProperty(PROP_OPACITY, pFader, 0);
// Done
*retpAni = pAni;
}