/* void scrollToElement (in nsIDOMElement child); */
NS_IMETHODIMP nsScrollBoxObject::ScrollToElement(nsIDOMElement *child)
{
NS_ENSURE_ARG_POINTER(child);
nsIScrollableView* scrollableView = GetScrollableView();
if (!scrollableView)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIPresShell> shell = GetPresShell(PR_FALSE);
if (!shell) {
return NS_ERROR_UNEXPECTED;
}
nsIFrame* scrolledBox = GetScrolledBox(this);
if (!scrolledBox)
return NS_ERROR_FAILURE;
nsRect rect, crect;
nsCOMPtr<nsIDOMDocument> doc;
child->GetOwnerDocument(getter_AddRefs(doc));
nsCOMPtr<nsIDOMNSDocument> nsDoc(do_QueryInterface(doc));
if(!nsDoc)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIBoxObject> childBoxObject;
nsDoc->GetBoxObjectFor(child, getter_AddRefs(childBoxObject));
if(!childBoxObject)
return NS_ERROR_UNEXPECTED;
PRInt32 x,y;
childBoxObject->GetX(&x);
childBoxObject->GetY(&y);
// get the twips rectangle from the boxobject (which has pixels)
rect.x = nsPresContext::CSSPixelsToAppUnits(x);
rect.y = nsPresContext::CSSPixelsToAppUnits(y);
// TODO: make sure the child is inside the box
// get our current info
nsPoint cp;
scrollableView->GetScrollPosition(cp.x,cp.y);
nsIntRect prect;
GetOffsetRect(prect);
crect = nsIntRect::ToAppUnits(prect, nsPresContext::AppUnitsPerCSSPixel());
nscoord newx=cp.x, newy=cp.y;
// we only scroll in the direction of the scrollbox orientation
// always scroll to left or top edge of child element
if (scrolledBox->IsHorizontal()) {
newx = rect.x - crect.x;
} else {
newy = rect.y - crect.y;
}
// scroll away
return scrollableView->ScrollTo(newx, newy, 0);
}
/* private helper */
void ScrollBoxObject::GetScrolledSize(nsRect& aRect, ErrorResult& aRv)
{
nsIFrame* scrolledBox = GetScrolledBox(this);
if (!scrolledBox) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
aRect = scrolledBox->GetRect();
aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
}
/* void getScrolledSize (out long width, out long height); */
NS_IMETHODIMP nsScrollBoxObject::GetScrolledSize(PRInt32 *width, PRInt32 *height)
{
nsIFrame* scrolledBox = GetScrolledBox(this);
if (!scrolledBox)
return NS_ERROR_FAILURE;
nsRect scrollRect = scrolledBox->GetRect();
*width = nsPresContext::AppUnitsToIntCSSPixels(scrollRect.width);
*height = nsPresContext::AppUnitsToIntCSSPixels(scrollRect.height);
return NS_OK;
}
/* void scrollByIndex (long dindexes); */
void ScrollBoxObject::ScrollByIndex(int32_t dindexes, ErrorResult& aRv)
{
nsIScrollableFrame* sf = GetScrollFrame();
if (!sf) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
nsIFrame* scrolledBox = GetScrolledBox(this);
if (!scrolledBox) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
nsRect rect;
// now get the scrolled boxes first child.
nsIFrame* child = nsBox::GetChildBox(scrolledBox);
bool horiz = scrolledBox->IsHorizontal();
nsPoint cp = sf->GetScrollPosition();
nscoord diff = 0;
int32_t curIndex = 0;
bool isLTR = scrolledBox->IsNormalDirection();
int32_t frameWidth = 0;
if (!isLTR && horiz) {
GetWidth(&frameWidth);
nsCOMPtr<nsIPresShell> shell = GetPresShell(false);
if (!shell) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return;
}
frameWidth = nsPresContext::CSSPixelsToAppUnits(frameWidth);
}
// first find out what index we are currently at
while(child) {
rect = child->GetRect();
if (horiz) {
// In the left-to-right case we break from the loop when the center of
// the current child rect is greater than the scrolled position of
// the left edge of the scrollbox
// In the right-to-left case we break when the center of the current
// child rect is less than the scrolled position of the right edge of
// the scrollbox.
diff = rect.x + rect.width/2; // use the center, to avoid rounding errors
if ((isLTR && diff > cp.x) ||
(!isLTR && diff < cp.x + frameWidth)) {
break;
}
} else {
diff = rect.y + rect.height/2;// use the center, to avoid rounding errors
if (diff > cp.y) {
break;
}
}
child = nsBox::GetNextBox(child);
curIndex++;
}
int32_t count = 0;
if (dindexes == 0)
return;
if (dindexes > 0) {
while(child) {
child = nsBox::GetNextBox(child);
if (child) {
rect = child->GetRect();
}
count++;
if (count >= dindexes) {
break;
}
}
} else if (dindexes < 0) {
child = nsBox::GetChildBox(scrolledBox);
while(child) {
rect = child->GetRect();
if (count >= curIndex + dindexes) {
break;
}
count++;
child = nsBox::GetNextBox(child);
}
}
nscoord csspixel = nsPresContext::CSSPixelsToAppUnits(1);
if (horiz) {
// In the left-to-right case we scroll so that the left edge of the
// selected child is scrolled to the left edge of the scrollbox.
// In the right-to-left case we scroll so that the right edge of the
// selected child is scrolled to the right edge of the scrollbox.
nsPoint pt(isLTR ? rect.x : rect.x + rect.width - frameWidth,
cp.y);
// Use a destination range that ensures the left edge (or right edge,
// for RTL) will indeed be visible. Also ensure that the top edge
// is visible.
nsRect range(pt.x, pt.y, csspixel, 0);
if (isLTR) {
range.x -= csspixel;
}
sf->ScrollTo(pt, nsIScrollableFrame::INSTANT, &range);
} else {
// Use a destination range that ensures the top edge will be visible.
nsRect range(cp.x, rect.y - csspixel, 0, csspixel);
sf->ScrollTo(nsPoint(cp.x, rect.y), nsIScrollableFrame::INSTANT, &range);
}
}
/* void ensureElementIsVisible (in nsIDOMElement child); */
NS_IMETHODIMP nsScrollBoxObject::EnsureElementIsVisible(nsIDOMElement *child)
{
NS_ENSURE_ARG_POINTER(child);
// Start with getting info about the child, since that will flush
// layout and possibly destroy scrollable views, presshells, etc.
nsCOMPtr<nsIDOMDocument> doc;
// XXXbz sXBL/XBL2 issue -- which document?
child->GetOwnerDocument(getter_AddRefs(doc));
nsCOMPtr<nsIDOMNSDocument> nsDoc(do_QueryInterface(doc));
if(!nsDoc)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIBoxObject> childBoxObject;
nsDoc->GetBoxObjectFor(child, getter_AddRefs(childBoxObject));
if(!childBoxObject)
return NS_ERROR_UNEXPECTED;
PRInt32 x, y, width, height;
childBoxObject->GetX(&x);
childBoxObject->GetY(&y);
childBoxObject->GetWidth(&width);
childBoxObject->GetHeight(&height);
nsIScrollableView* scrollableView = GetScrollableView();
if (!scrollableView)
return NS_ERROR_FAILURE;
nsIFrame* scrolledBox = GetScrolledBox(this);
if (!scrolledBox)
return NS_ERROR_FAILURE;
nsRect rect, crect;
// get the twips rectangle from the boxobject (which has pixels)
rect.x = nsPresContext::CSSPixelsToAppUnits(x);
rect.y = nsPresContext::CSSPixelsToAppUnits(y);
rect.width = nsPresContext::CSSPixelsToAppUnits(width);
rect.height = nsPresContext::CSSPixelsToAppUnits(height);
// TODO: make sure the child is inside the box
// get our current info
nsPoint cp;
scrollableView->GetScrollPosition(cp.x,cp.y);
nsIntRect prect;
GetOffsetRect(prect);
crect = nsIntRect::ToAppUnits(prect, nsPresContext::AppUnitsPerCSSPixel());
nscoord newx=cp.x, newy=cp.y;
// we only scroll in the direction of the scrollbox orientation
if (scrolledBox->IsHorizontal()) {
if ((rect.x - crect.x) + rect.width > cp.x + crect.width) {
newx = cp.x + (((rect.x - crect.x) + rect.width)-(cp.x + crect.width));
} else if (rect.x - crect.x < cp.x) {
newx = rect.x - crect.x;
}
} else {
if ((rect.y - crect.y) + rect.height > cp.y + crect.height) {
newy = cp.y + (((rect.y - crect.y) + rect.height)-(cp.y + crect.height));
} else if (rect.y - crect.y < cp.y) {
newy = rect.y - crect.y;
}
}
// scroll away
return scrollableView->ScrollTo(newx, newy, 0);
}
/* void scrollByIndex (in long dindexes); */
NS_IMETHODIMP nsScrollBoxObject::ScrollByIndex(PRInt32 dindexes)
{
nsIScrollableView* scrollableView = GetScrollableView();
if (!scrollableView)
return NS_ERROR_FAILURE;
nsIFrame* scrolledBox = GetScrolledBox(this);
if (!scrolledBox)
return NS_ERROR_FAILURE;
nsRect rect;
// now get the scrolled boxes first child.
nsIFrame* child = scrolledBox->GetChildBox();
PRBool horiz = scrolledBox->IsHorizontal();
nsPoint cp;
scrollableView->GetScrollPosition(cp.x,cp.y);
nscoord diff = 0;
PRInt32 curIndex = 0;
PRBool isLTR = scrolledBox->IsNormalDirection();
PRInt32 frameWidth = 0;
if (!isLTR && horiz) {
GetWidth(&frameWidth);
nsCOMPtr<nsIPresShell> shell = GetPresShell(PR_FALSE);
if (!shell) {
return NS_ERROR_UNEXPECTED;
}
frameWidth = nsPresContext::CSSPixelsToAppUnits(frameWidth);
}
// first find out what index we are currently at
while(child) {
rect = child->GetRect();
if (horiz) {
// In the left-to-right case we break from the loop when the center of
// the current child rect is greater than the scrolled position of
// the left edge of the scrollbox
// In the right-to-left case we break when the center of the current
// child rect is less than the scrolled position of the right edge of
// the scrollbox.
diff = rect.x + rect.width/2; // use the center, to avoid rounding errors
if ((isLTR && diff > cp.x) ||
(!isLTR && diff < cp.x + frameWidth)) {
break;
}
} else {
diff = rect.y + rect.height/2;// use the center, to avoid rounding errors
if (diff > cp.y) {
break;
}
}
child = child->GetNextBox();
curIndex++;
}
PRInt32 count = 0;
if (dindexes == 0)
return NS_OK;
if (dindexes > 0) {
while(child) {
child = child->GetNextBox();
if (child)
rect = child->GetRect();
count++;
if (count >= dindexes)
break;
}
} else if (dindexes < 0) {
child = scrolledBox->GetChildBox();
while(child) {
rect = child->GetRect();
if (count >= curIndex + dindexes)
break;
count++;
child = child->GetNextBox();
}
}
if (horiz)
// In the left-to-right case we scroll so that the left edge of the
// selected child is scrolled to the left edge of the scrollbox.
// In the right-to-left case we scroll so that the right edge of the
// selected child is scrolled to the right edge of the scrollbox.
return scrollableView->ScrollTo((isLTR) ? rect.x :
rect.x + rect.width - frameWidth, cp.y, 0);
else
return scrollableView->ScrollTo(cp.x, rect.y, 0);
}