Hi,
I have a question about SetTextZoom method in DocumentViewerImpl. I
think this method is eventully being called when users do the "Text
Size->Increase" command.
But what i notice is when I incease text size, some content get over
lapped. For example the 'latest news' in CNN'. Text there will be
overlapped when you increase text by 1 times.
What I want to do is, I increase the Text size and the container of
the text will increase its height so that no content will overlapped.
I have been looking at the SetTextZoom() of DocumentViewerImpl, but I
don't know what does "aChild->SetTextZoom(textZoomInfo->mTextZoom);"
do? Where does it walk thru each text node in the DOM to adjust the
text size?
2643 static void
2644 SetChildTextZoom(nsIMarkupDocumentViewer* aChild, void* aClosure)
2645 {
2646 struct TextZoomInfo* textZoomInfo = (struct TextZoomInfo*)
aClosure;
2647 aChild->SetTextZoom(textZoomInfo->mTextZoom);
2648 }
2649
2650 NS_IMETHODIMP
2651 DocumentViewerImpl::SetTextZoom(float aTextZoom)
2652 {
2653 mTextZoom = aTextZoom;
2654
2655 if (mViewManager) {
2656 mViewManager->BeginUpdateViewBatch();
2657 }
2658
2659 // Set the text zoom on all children of mContainer (even if our
zoom didn't
2660 // change, our children's zoom may be different, though it
would be unusual).
2661 // Do this first, in case kids are auto-sizing and post reflow
commands on
2662 // our presshell (which should be subsumed into our own style
change reflow).
2663 struct TextZoomInfo textZoomInfo = { aTextZoom };
2664 CallChildren(SetChildTextZoom, &textZoomInfo);
2665
2666 // Now change our own zoom
2667 if (mPresContext && aTextZoom != mPresContext->TextZoom()) {
2668 mPresContext->SetTextZoom(aTextZoom);
2669 }
2670
2671 if (mViewManager) {
2672 mViewManager->EndUpdateViewBatch(NS_VMREFRESH_NO_SYNC);
2673 }
2674
2675 return NS_OK;
2676 }
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