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platform_packages_apps_Launcher3
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Fix bug 2629457 - Scale home screen settle animation based on distance. 

This fixes the issue where using the long-press-on-dots feature to
jump to a specific home screen overshoots by a large distance. It also
speeds up the resulting animation such that jumping from screen 1 to 5
doesn't take as long.

Change-Id: If41086b17df875be5514776e3af24292587d05a7
This commit is contained in:
Adam Powell 2010-04-26 11:52:44 -07:00
parent 6ad7942740
commit 2762dd856e
1 changed files with 27 additions and 3 deletions
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30
src/com/android/launcher2/Workspace.java
View File

@ -42,7 +42,7 @@ import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.animation.OvershootInterpolator;
import android.view.animation.Interpolator;
import android.widget.Scroller;
import android.widget.TextView;
@ -119,6 +119,28 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
private Drawable mPreviousIndicator;
private Drawable mNextIndicator;
private WorkspaceOvershootInterpolator mScrollInterpolator;
private static class WorkspaceOvershootInterpolator implements Interpolator {
private static final float DEFAULT_TENSION = 2.f;
private float mTension;
public WorkspaceOvershootInterpolator() {
mTension = DEFAULT_TENSION;
}
public void setDistance(int distance) {
mTension = distance > 0 ? DEFAULT_TENSION / distance : DEFAULT_TENSION;
}
public float getInterpolation(float t) {
// _o(t) = t * t * ((tension + 1) * t + tension)
// o(t) = _o(t - 1) + 1
t -= 1.0f;
return t * t * ((mTension + 1) * t + mTension) + 1.0f;
}
}
/**
* Used to inflate the Workspace from XML.
*
@ -154,7 +176,8 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
*/
private void initWorkspace() {
Context context = getContext();
mScroller = new Scroller(context, new OvershootInterpolator());
mScrollInterpolator = new WorkspaceOvershootInterpolator();
mScroller = new Scroller(context, mScrollInterpolator);
mCurrentScreen = mDefaultScreen;
Launcher.setScreen(mCurrentScreen);
LauncherApplication app = (LauncherApplication)context.getApplicationContext();
@ -917,10 +940,11 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
final int newX = whichScreen * getWidth();
final int delta = newX - mScrollX;
final int duration = screenDelta != 0 ? screenDelta * 300 : 300;
final int duration = screenDelta != 0 ? 200 + screenDelta * 100 : 300;
awakenScrollBars(duration);
if (!mScroller.isFinished()) mScroller.abortAnimation();
mScrollInterpolator.setDistance(screenDelta);
mScroller.startScroll(mScrollX, 0, delta, 0, duration);
invalidate();
}