void ContentLayerChromium::updateLayerSize(const IntSize& layerSize)
{
if (!m_tiler)
return;
const IntSize tileSize(min(defaultTileSize, layerSize.width()), min(defaultTileSize, layerSize.height()));
// Tile if both dimensions large, or any one dimension large and the other
// extends into a second tile. This heuristic allows for long skinny layers
// (e.g. scrollbars) that are Nx1 tiles to minimize wasted texture space.
const bool anyDimensionLarge = layerSize.width() > maxUntiledSize || layerSize.height() > maxUntiledSize;
const bool anyDimensionOneTile = layerSize.width() <= defaultTileSize || layerSize.height() <= defaultTileSize;
const bool autoTiled = anyDimensionLarge && !anyDimensionOneTile;
bool isTiled;
if (m_tilingOption == AlwaysTile)
isTiled = true;
else if (m_tilingOption == NeverTile)
isTiled = false;
else
isTiled = autoTiled;
IntSize requestedSize = isTiled ? tileSize : layerSize;
const int maxSize = layerRenderer()->maxTextureSize();
IntSize clampedSize = requestedSize.shrunkTo(IntSize(maxSize, maxSize));
m_tiler->setTileSize(clampedSize);
}
IntPoint VisualViewport::clampDocumentOffsetAtScale(const IntPoint& offset,
float scale) {
if (!mainFrame() || !mainFrame()->view())
return IntPoint();
FrameView* view = mainFrame()->view();
FloatSize scaledSize(m_size);
scaledSize.scale(1 / scale);
IntSize visualViewportMax =
flooredIntSize(FloatSize(contentsSize()) - scaledSize);
IntSize max = view->maximumScrollOffsetInt() + visualViewportMax;
IntSize min =
view->minimumScrollOffsetInt(); // VisualViewportMin should be (0, 0)
IntSize clamped = toIntSize(offset);
clamped = clamped.shrunkTo(max);
clamped = clamped.expandedTo(min);
return IntPoint(clamped);
}
void TiledLayerChromium::updateTileSizeAndTilingOption()
{
const IntSize tileSize(min(defaultTileSize, contentBounds().width()), min(defaultTileSize, contentBounds().height()));
// Tile if both dimensions large, or any one dimension large and the other
// extends into a second tile. This heuristic allows for long skinny layers
// (e.g. scrollbars) that are Nx1 tiles to minimize wasted texture space.
const bool anyDimensionLarge = contentBounds().width() > maxUntiledSize || contentBounds().height() > maxUntiledSize;
const bool anyDimensionOneTile = contentBounds().width() <= defaultTileSize || contentBounds().height() <= defaultTileSize;
const bool autoTiled = anyDimensionLarge && !anyDimensionOneTile;
bool isTiled;
if (m_tilingOption == AlwaysTile)
isTiled = true;
else if (m_tilingOption == NeverTile)
isTiled = false;
else
isTiled = autoTiled;
IntSize requestedSize = isTiled ? tileSize : contentBounds();
const int maxSize = layerTreeHost()->layerRendererCapabilities().maxTextureSize;
IntSize clampedSize = requestedSize.shrunkTo(IntSize(maxSize, maxSize));
setTileSize(clampedSize);
}
void ScrollView::updateScrollbars(const IntSize& desiredOffset)
{
if (m_inUpdateScrollbars || prohibitsScrolling() || platformWidget())
return;
// If we came in here with the view already needing a layout, then go ahead and do that
// first. (This will be the common case, e.g., when the page changes due to window resizing for example).
// This layout will not re-enter updateScrollbars and does not count towards our max layout pass total.
if (!m_scrollbarsSuppressed) {
m_inUpdateScrollbars = true;
visibleContentsResized();
m_inUpdateScrollbars = false;
}
bool hasHorizontalScrollbar = m_horizontalScrollbar;
bool hasVerticalScrollbar = m_verticalScrollbar;
bool newHasHorizontalScrollbar = hasHorizontalScrollbar;
bool newHasVerticalScrollbar = hasVerticalScrollbar;
ScrollbarMode hScroll = m_horizontalScrollbarMode;
ScrollbarMode vScroll = m_verticalScrollbarMode;
if (hScroll != ScrollbarAuto)
newHasHorizontalScrollbar = (hScroll == ScrollbarAlwaysOn);
if (vScroll != ScrollbarAuto)
newHasVerticalScrollbar = (vScroll == ScrollbarAlwaysOn);
if (m_scrollbarsSuppressed || (hScroll != ScrollbarAuto && vScroll != ScrollbarAuto)) {
if (hasHorizontalScrollbar != newHasHorizontalScrollbar)
setHasHorizontalScrollbar(newHasHorizontalScrollbar);
if (hasVerticalScrollbar != newHasVerticalScrollbar)
setHasVerticalScrollbar(newHasVerticalScrollbar);
} else {
bool sendContentResizedNotification = false;
IntSize docSize = contentsSize();
IntSize frameSize = frameRect().size();
if (hScroll == ScrollbarAuto) {
newHasHorizontalScrollbar = docSize.width() > visibleWidth();
if (newHasHorizontalScrollbar && !m_updateScrollbarsPass && docSize.width() <= frameSize.width() && docSize.height() <= frameSize.height())
newHasHorizontalScrollbar = false;
}
if (vScroll == ScrollbarAuto) {
newHasVerticalScrollbar = docSize.height() > visibleHeight();
if (newHasVerticalScrollbar && !m_updateScrollbarsPass && docSize.width() <= frameSize.width() && docSize.height() <= frameSize.height())
newHasVerticalScrollbar = false;
}
// If we ever turn one scrollbar off, always turn the other one off too. Never ever
// try to both gain/lose a scrollbar in the same pass.
if (!newHasHorizontalScrollbar && hasHorizontalScrollbar && vScroll != ScrollbarAlwaysOn)
newHasVerticalScrollbar = false;
if (!newHasVerticalScrollbar && hasVerticalScrollbar && hScroll != ScrollbarAlwaysOn)
newHasHorizontalScrollbar = false;
if (hasHorizontalScrollbar != newHasHorizontalScrollbar) {
setHasHorizontalScrollbar(newHasHorizontalScrollbar);
sendContentResizedNotification = true;
}
if (hasVerticalScrollbar != newHasVerticalScrollbar) {
setHasVerticalScrollbar(newHasVerticalScrollbar);
sendContentResizedNotification = true;
}
if (sendContentResizedNotification && m_updateScrollbarsPass < cMaxUpdateScrollbarsPass) {
m_updateScrollbarsPass++;
contentsResized();
visibleContentsResized();
IntSize newDocSize = contentsSize();
if (newDocSize == docSize) {
// The layout with the new scroll state had no impact on
// the document's overall size, so updateScrollbars didn't get called.
// Recur manually.
updateScrollbars(desiredOffset);
}
m_updateScrollbarsPass--;
}
}
// Set up the range (and page step/line step), but only do this if we're not in a nested call (to avoid
// doing it multiple times).
if (m_updateScrollbarsPass)
return;
m_inUpdateScrollbars = true;
IntSize maxScrollPosition(contentsWidth() - visibleWidth(), contentsHeight() - visibleHeight());
IntSize scroll = desiredOffset.shrunkTo(maxScrollPosition);
scroll.clampNegativeToZero();
if (m_horizontalScrollbar) {
int clientWidth = visibleWidth();
m_horizontalScrollbar->setEnabled(contentsWidth() > clientWidth);
int pageStep = max(max<int>(clientWidth * Scrollbar::minFractionToStepWhenPaging(), clientWidth - Scrollbar::maxOverlapBetweenPages()), 1);
IntRect oldRect(m_horizontalScrollbar->frameRect());
IntRect hBarRect = IntRect(0,
height() - m_horizontalScrollbar->height(),
width() - (m_verticalScrollbar ? m_verticalScrollbar->width() : 0),
m_horizontalScrollbar->height());
m_horizontalScrollbar->setFrameRect(hBarRect);
if (!m_scrollbarsSuppressed && oldRect != m_horizontalScrollbar->frameRect())
m_horizontalScrollbar->invalidate();
if (m_scrollbarsSuppressed)
m_horizontalScrollbar->setSuppressInvalidation(true);
m_horizontalScrollbar->setSteps(Scrollbar::pixelsPerLineStep(), pageStep);
m_horizontalScrollbar->setProportion(clientWidth, contentsWidth());
m_horizontalScrollbar->setValue(scroll.width());
if (m_scrollbarsSuppressed)
m_horizontalScrollbar->setSuppressInvalidation(false);
}
if (m_verticalScrollbar) {
int clientHeight = visibleHeight();
m_verticalScrollbar->setEnabled(contentsHeight() > clientHeight);
int pageStep = max(max<int>(clientHeight * Scrollbar::minFractionToStepWhenPaging(), clientHeight - Scrollbar::maxOverlapBetweenPages()), 1);
IntRect oldRect(m_verticalScrollbar->frameRect());
IntRect vBarRect = IntRect(width() - m_verticalScrollbar->width(),
0,
m_verticalScrollbar->width(),
height() - (m_horizontalScrollbar ? m_horizontalScrollbar->height() : 0));
m_verticalScrollbar->setFrameRect(vBarRect);
if (!m_scrollbarsSuppressed && oldRect != m_verticalScrollbar->frameRect())
m_verticalScrollbar->invalidate();
if (m_scrollbarsSuppressed)
m_verticalScrollbar->setSuppressInvalidation(true);
m_verticalScrollbar->setSteps(Scrollbar::pixelsPerLineStep(), pageStep);
m_verticalScrollbar->setProportion(clientHeight, contentsHeight());
m_verticalScrollbar->setValue(scroll.height());
if (m_scrollbarsSuppressed)
m_verticalScrollbar->setSuppressInvalidation(false);
}
if (hasHorizontalScrollbar != (m_horizontalScrollbar != 0) || hasVerticalScrollbar != (m_verticalScrollbar != 0)) {
frameRectsChanged();
updateScrollCorner();
}
// See if our offset has changed in a situation where we might not have scrollbars.
// This can happen when editing a body with overflow:hidden and scrolling to reveal selection.
// It can also happen when maximizing a window that has scrollbars (but the new maximized result
// does not).
IntSize scrollDelta = scroll - m_scrollOffset;
if (scrollDelta != IntSize()) {
m_scrollOffset = scroll;
scrollContents(scrollDelta);
}
m_inUpdateScrollbars = false;
}
void ScrollView::updateScrollbars(const IntSize& desiredOffset)
{
// Don't allow re-entrancy into this function.
if (m_data->m_inUpdateScrollbars)
return;
// FIXME: This code is here so we don't have to fork FrameView.h/.cpp.
// In the end, FrameView should just merge with ScrollView.
if (static_cast<const FrameView*>(this)->frame()->prohibitsScrolling())
return;
m_data->m_inUpdateScrollbars = true;
bool hasVerticalScrollbar = m_data->m_vBar;
bool hasHorizontalScrollbar = m_data->m_hBar;
bool oldHasVertical = hasVerticalScrollbar;
bool oldHasHorizontal = hasHorizontalScrollbar;
ScrollbarMode hScroll = m_data->m_hScrollbarMode;
ScrollbarMode vScroll = m_data->m_vScrollbarMode;
const int cVerticalWidth = PlatformScrollbar::verticalScrollbarWidth();
const int cHorizontalHeight = PlatformScrollbar::horizontalScrollbarHeight();
for (int pass = 0; pass < 2; pass++) {
bool scrollsVertically;
bool scrollsHorizontally;
if (!m_data->m_scrollbarsSuppressed && (hScroll == ScrollbarAuto || vScroll == ScrollbarAuto)) {
// Do a layout if pending before checking if scrollbars are needed.
if (hasVerticalScrollbar != oldHasVertical || hasHorizontalScrollbar != oldHasHorizontal)
static_cast<FrameView*>(this)->layout();
scrollsVertically = (vScroll == ScrollbarAlwaysOn) || (vScroll == ScrollbarAuto && contentsHeight() > height());
if (scrollsVertically)
scrollsHorizontally = (hScroll == ScrollbarAlwaysOn) || (hScroll == ScrollbarAuto && contentsWidth() + cVerticalWidth > width());
else {
scrollsHorizontally = (hScroll == ScrollbarAlwaysOn) || (hScroll == ScrollbarAuto && contentsWidth() > width());
if (scrollsHorizontally)
scrollsVertically = (vScroll == ScrollbarAlwaysOn) || (vScroll == ScrollbarAuto && contentsHeight() + cHorizontalHeight > height());
}
}
else {
scrollsHorizontally = (hScroll == ScrollbarAuto) ? hasHorizontalScrollbar : (hScroll == ScrollbarAlwaysOn);
scrollsVertically = (vScroll == ScrollbarAuto) ? hasVerticalScrollbar : (vScroll == ScrollbarAlwaysOn);
}
if (hasVerticalScrollbar != scrollsVertically) {
m_data->setHasVerticalScrollbar(scrollsVertically);
hasVerticalScrollbar = scrollsVertically;
}
if (hasHorizontalScrollbar != scrollsHorizontally) {
m_data->setHasHorizontalScrollbar(scrollsHorizontally);
hasHorizontalScrollbar = scrollsHorizontally;
}
}
// Set up the range (and page step/line step).
IntSize maxScrollPosition(contentsWidth() - visibleWidth(), contentsHeight() - visibleHeight());
IntSize scroll = desiredOffset.shrunkTo(maxScrollPosition);
scroll.clampNegativeToZero();
if (m_data->m_hBar) {
int clientWidth = visibleWidth();
m_data->m_hBar->setEnabled(contentsWidth() > clientWidth);
int pageStep = (clientWidth - PAGE_KEEP);
if (pageStep < 0) pageStep = clientWidth;
IntRect oldRect(m_data->m_hBar->frameGeometry());
IntRect hBarRect = IntRect(0,
height() - m_data->m_hBar->height(),
width() - (m_data->m_vBar ? m_data->m_vBar->width() : 0),
m_data->m_hBar->height());
m_data->m_hBar->setRect(hBarRect);
if (!m_data->m_scrollbarsSuppressed && oldRect != m_data->m_hBar->frameGeometry())
m_data->m_hBar->invalidate();
if (m_data->m_scrollbarsSuppressed)
m_data->m_hBar->setSuppressInvalidation(true);
m_data->m_hBar->setSteps(LINE_STEP, pageStep);
m_data->m_hBar->setProportion(clientWidth, contentsWidth());
m_data->m_hBar->setValue(scroll.width());
if (m_data->m_scrollbarsSuppressed)
m_data->m_hBar->setSuppressInvalidation(false);
}
if (m_data->m_vBar) {
int clientHeight = visibleHeight();
m_data->m_vBar->setEnabled(contentsHeight() > clientHeight);
int pageStep = (clientHeight - PAGE_KEEP);
if (pageStep < 0) pageStep = clientHeight;
IntRect oldRect(m_data->m_vBar->frameGeometry());
IntRect vBarRect = IntRect(width() - m_data->m_vBar->width(),
0,
m_data->m_vBar->width(),
height() - (m_data->m_hBar ? m_data->m_hBar->height() : 0));
m_data->m_vBar->setRect(vBarRect);
if (!m_data->m_scrollbarsSuppressed && oldRect != m_data->m_vBar->frameGeometry())
m_data->m_vBar->invalidate();
if (m_data->m_scrollbarsSuppressed)
m_data->m_vBar->setSuppressInvalidation(true);
m_data->m_vBar->setSteps(LINE_STEP, pageStep);
m_data->m_vBar->setProportion(clientHeight, contentsHeight());
m_data->m_vBar->setValue(scroll.height());
if (m_data->m_scrollbarsSuppressed)
m_data->m_vBar->setSuppressInvalidation(false);
}
if (oldHasVertical != (m_data->m_vBar != 0) || oldHasHorizontal != (m_data->m_hBar != 0))
geometryChanged();
// See if our offset has changed in a situation where we might not have scrollbars.
// This can happen when editing a body with overflow:hidden and scrolling to reveal selection.
// It can also happen when maximizing a window that has scrollbars (but the new maximized result
// does not).
IntSize scrollDelta = scroll - m_data->m_scrollOffset;
if (scrollDelta != IntSize()) {
m_data->m_scrollOffset = scroll;
m_data->scrollBackingStore(scrollDelta);
}
m_data->m_inUpdateScrollbars = false;
}