/* 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);
}
Пример #2
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;
}
Пример #4
0
/* 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);
}