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Bug 853831 - Fix fixed margins on the opposite side of overscroll. r=kats

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If overscroll eats into a fixed margin, we need to apply the opposite
offset to the opposite side of the axis this occurred on. This has the effect
of fixed-position elements aligned to the bottom of the screen remaining
visible when at the top of the page.
This commit is contained in:
Kartikaya Gupta 2013-03-25 14:13:59 -04:00
parent 5d433229b3
commit 63c484593f
2 changed files with 73 additions and 24 deletions
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89
mobile/android/base/gfx/GeckoLayerClient.java
View File

@ -58,8 +58,9 @@ public class GeckoLayerClient implements LayerView.Listener, PanZoomTarget
/* Used by robocop for testing purposes */
private DrawListener mDrawListener;
/* Used as a temporary ViewTransform by syncViewportInfo */
/* Used as temporaries by syncViewportInfo */
private final ViewTransform mCurrentViewTransform;
private final RectF mCurrentViewTransformMargins;
/* Used as the return value of progressiveUpdateCallback */
private final ProgressiveUpdateData mProgressiveUpdateData;
@ -102,6 +103,7 @@ public class GeckoLayerClient implements LayerView.Listener, PanZoomTarget
mRecordDrawTimes = true;
mDrawTimingQueue = new DrawTimingQueue();
mCurrentViewTransform = new ViewTransform(0, 0, 1);
mCurrentViewTransformMargins = new RectF();
mProgressiveUpdateData = new ProgressiveUpdateData();
mProgressiveUpdateDisplayPort = new DisplayPortMetrics();
mLastProgressiveUpdateWasLowPrecision = false;
@ -257,22 +259,68 @@ public class GeckoLayerClient implements LayerView.Listener, PanZoomTarget
});
}
private boolean adjustFixedLayerMarginsForOverscroll(ImmutableViewportMetrics metrics, RectF adjustedMargins) {
// When the page is in overscroll, we want that to 'eat into' the fixed
// margin on that side of the viewport. This is because overscroll
// equates to extra visible area and we use the fixed margins to stop
// fixed position elements from being obscured by chrome.
// In this situation, we also want to do the opposite adjustment to the
// other end of the axis, so that when overscroll is cancelled out by
// the margin area, the opposite side isn't pushed out of the viewport.
boolean changed = false;
adjustedMargins.left = metrics.fixedLayerMarginLeft;
adjustedMargins.top = metrics.fixedLayerMarginTop;
adjustedMargins.right = metrics.fixedLayerMarginRight;
adjustedMargins.bottom = metrics.fixedLayerMarginBottom;
if (metrics.getPageWidth() > metrics.getWidthWithoutMargins()) {
// Adjust for left overscroll
if (metrics.viewportRectLeft < metrics.pageRectLeft && metrics.fixedLayerMarginLeft > 0) {
adjustedMargins.left = Math.max(0, metrics.fixedLayerMarginLeft
- (metrics.pageRectLeft - metrics.viewportRectLeft));
adjustedMargins.right += metrics.fixedLayerMarginLeft - adjustedMargins.left;
changed = true;
}
// Adjust for right overscroll
if (metrics.viewportRectRight < metrics.pageRectRight && metrics.fixedLayerMarginRight > 0) {
adjustedMargins.right = Math.max(0, metrics.fixedLayerMarginRight
- (metrics.pageRectRight - metrics.viewportRectRight));
adjustedMargins.left += metrics.fixedLayerMarginRight - adjustedMargins.right;
changed = true;
}
}
if (metrics.getPageHeight() > metrics.getHeightWithoutMargins()) {
// Adjust for top overscroll
if (metrics.viewportRectTop < metrics.pageRectTop && metrics.fixedLayerMarginTop > 0) {
adjustedMargins.top = Math.max(0, metrics.fixedLayerMarginTop
- (metrics.pageRectTop - metrics.viewportRectTop));
adjustedMargins.bottom += metrics.fixedLayerMarginTop - adjustedMargins.top;
changed = true;
}
// Adjust for bottom overscroll
if (metrics.viewportRectBottom < metrics.pageRectBottom && metrics.fixedLayerMarginBottom > 0) {
adjustedMargins.bottom = Math.max(0, metrics.fixedLayerMarginBottom
- (metrics.pageRectBottom - metrics.viewportRectBottom));
adjustedMargins.top += metrics.fixedLayerMarginBottom - adjustedMargins.bottom;
changed = true;
}
}
return changed;
}
private void adjustViewport(DisplayPortMetrics displayPort) {
ImmutableViewportMetrics metrics = getViewportMetrics();
ImmutableViewportMetrics clampedMetrics = metrics.clamp();
// See if we need to alter the fixed margins - Fixed margins would
// otherwise be set even when the document is in overscroll and they're
// unnecessary.
if ((metrics.fixedLayerMarginLeft > 0 && metrics.viewportRectLeft < metrics.pageRectLeft) ||
(metrics.fixedLayerMarginTop > 0 && metrics.viewportRectTop < metrics.pageRectTop) ||
(metrics.fixedLayerMarginRight > 0 && metrics.viewportRectRight > metrics.pageRectRight) ||
(metrics.fixedLayerMarginBottom > 0 && metrics.viewportRectBottom > metrics.pageRectBottom)) {
RectF fixedLayerMargins = new RectF();
if (adjustFixedLayerMarginsForOverscroll(metrics, fixedLayerMargins)) {
clampedMetrics = clampedMetrics.setFixedLayerMargins(
Math.max(0, metrics.fixedLayerMarginLeft + Math.min(0, metrics.viewportRectLeft - metrics.pageRectLeft)),
Math.max(0, metrics.fixedLayerMarginTop + Math.min(0, metrics.viewportRectTop - metrics.pageRectTop)),
Math.max(0, metrics.fixedLayerMarginRight + Math.min(0, (metrics.pageRectRight - metrics.viewportRectRight))),
Math.max(0, metrics.fixedLayerMarginBottom + Math.min(0, (metrics.pageRectBottom - metrics.viewportRectBottom))));
fixedLayerMargins.left, fixedLayerMargins.top,
fixedLayerMargins.right, fixedLayerMargins.bottom);
}
if (displayPort == null) {
@ -630,18 +678,11 @@ public class GeckoLayerClient implements LayerView.Listener, PanZoomTarget
mCurrentViewTransform.scale = mFrameMetrics.zoomFactor;
// Adjust the fixed layer margins so that overscroll subtracts from them.
mCurrentViewTransform.fixedLayerMarginLeft =
Math.max(0, mFrameMetrics.fixedLayerMarginLeft +
Math.min(0, mFrameMetrics.viewportRectLeft - mFrameMetrics.pageRectLeft));
mCurrentViewTransform.fixedLayerMarginTop =
Math.max(0, mFrameMetrics.fixedLayerMarginTop +
Math.min(0, mFrameMetrics.viewportRectTop - mFrameMetrics.pageRectTop));
mCurrentViewTransform.fixedLayerMarginRight =
Math.max(0, mFrameMetrics.fixedLayerMarginRight +
Math.min(0, (mFrameMetrics.pageRectRight - mFrameMetrics.viewportRectRight)));
mCurrentViewTransform.fixedLayerMarginBottom =
Math.max(0, mFrameMetrics.fixedLayerMarginBottom +
Math.min(0, (mFrameMetrics.pageRectBottom - mFrameMetrics.viewportRectBottom)));
adjustFixedLayerMarginsForOverscroll(mFrameMetrics, mCurrentViewTransformMargins);
mCurrentViewTransform.fixedLayerMarginLeft = mCurrentViewTransformMargins.left;
mCurrentViewTransform.fixedLayerMarginTop = mCurrentViewTransformMargins.top;
mCurrentViewTransform.fixedLayerMarginRight = mCurrentViewTransformMargins.right;
mCurrentViewTransform.fixedLayerMarginBottom = mCurrentViewTransformMargins.bottom;
mRootLayer.setPositionAndResolution(x, y, x + width, y + height, resolution);

8
mobile/android/base/gfx/ImmutableViewportMetrics.java
View File

@ -95,6 +95,14 @@ public class ImmutableViewportMetrics {
return viewportRectBottom - viewportRectTop;
}
public float getWidthWithoutMargins() {
return viewportRectRight - viewportRectLeft - fixedLayerMarginLeft - fixedLayerMarginRight;
}
public float getHeightWithoutMargins() {
return viewportRectBottom - viewportRectTop - fixedLayerMarginTop - fixedLayerMarginBottom;
}
public PointF getOrigin() {
return new PointF(viewportRectLeft, viewportRectTop);
}