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platform_packages_apps_Launcher3
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Fixing panning behaviour 

Change-Id: Idd8268b5442a88b8ca30c2aa0ec8b80b59f7889d
This commit is contained in:
Adam Cohen 2011-02-15 13:53:42 -08:00
parent aefd4e1f51
commit b64cb5a44b
1 changed files with 6 additions and 3 deletions
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9
src/com/android/launcher2/PagedView.java
View File

@ -61,6 +61,7 @@ public abstract class PagedView extends ViewGroup {
private static final float OVERSCROLL_DAMP_FACTOR = 0.08f;
private static final int MINIMUM_SNAP_VELOCITY = 2200;
private static final int MIN_FLING_VELOCITY = 250;
private static final float RETURN_TO_ORIGINAL_PAGE_THRESHOLD = 0.33f;
// the velocity at which a fling gesture will cause us to snap to the next page
protected int mSnapVelocity = 500;
@ -1000,20 +1001,22 @@ public abstract class PagedView extends ViewGroup {
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int velocityX = (int) velocityTracker.getXVelocity(activePointerId);
final int deltaX = (int) (x - mDownMotionX);
boolean isSignificantMove = mTotalMotionX > MIN_LENGTH_FOR_MOVE;
boolean isSignificantMove = Math.abs(deltaX) > MIN_LENGTH_FOR_MOVE;
final int snapVelocity = mSnapVelocity;
mTotalMotionX += Math.abs(mLastMotionX + mLastMotionXRemainder - x);
// In the case that the page is moved far to one direction and then is flung
// in the opposite direction, we use a threshold to determine whether we should
// just return to the starting page, or if we should skip one further.
boolean returnToOriginalPage = false;
final int pageWidth = getScaledMeasuredWidth(getChildAt(mCurrentPage));
if (Math.abs(deltaX) > pageWidth / 3 &&
if (Math.abs(deltaX) > pageWidth * RETURN_TO_ORIGINAL_PAGE_THRESHOLD &&
Math.signum(velocityX) != Math.signum(deltaX)) {
returnToOriginalPage = true;
}
boolean isFling = Math.abs(deltaX) > MIN_LENGTH_FOR_FLING &&
boolean isFling = mTotalMotionX > MIN_LENGTH_FOR_FLING &&
Math.abs(velocityX) > snapVelocity;
int finalPage;