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Merge "Adding a scaling threshold in ScreenMagnifier" into jb-mr1-dev

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This commit is contained in:
Svetoslav Ganov
2012-09-11 18:16:14 -07:00
committed by Android (Google) Code Review
parent d057e73e7e 3e1476a697
commit 5e900e3a17
1 changed files with 19 additions and 12 deletions
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31
services/java/com/android/server/accessibility/ScreenMagnifier.java
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@@ -353,11 +353,13 @@ public final class ScreenMagnifier implements EventStreamTransformation {
private static final float MIN_SCALE = 1.3f;
private static final float MAX_SCALE = 5.0f;
private static final float SCALING_THRESHOLD = 0.3f;
private final ScaleGestureDetector mScaleGestureDetector;
private final GestureDetector mGestureDetector;
private float mScaleFocusX = -1;
private float mScaleFocusY = -1;
private float mInitialScaleFactor = -1;
private boolean mScaling;
public MagnifiedContentInteractonStateHandler(Context context) {
mScaleGestureDetector = new ScaleGestureDetector(context, this);
@@ -405,8 +407,17 @@ public final class ScreenMagnifier implements EventStreamTransformation {
@Override
public boolean onScale(ScaleGestureDetector detector) {
if (mCurrentState != STATE_MAGNIFIED_INTERACTION) {
return true;
if (!mScaling) {
if (mInitialScaleFactor < 0) {
mInitialScaleFactor = detector.getScaleFactor();
} else {
final float deltaScale = detector.getScaleFactor() - mInitialScaleFactor;
if (Math.abs(deltaScale) > SCALING_THRESHOLD) {
mScaling = true;
return true;
}
}
return false;
}
final float newScale = mMagnificationController.getScale()
* detector.getScaleFactor();
@@ -414,12 +425,8 @@ public final class ScreenMagnifier implements EventStreamTransformation {
if (DEBUG_SCALING) {
Slog.i(LOG_TAG, "normalizedNewScale: " + normalizedNewScale);
}
if (mScaleFocusX < 0 && mScaleFocusY < 0) {
mScaleFocusX = detector.getFocusX();
mScaleFocusY = detector.getFocusY();
}
mMagnificationController.setScale(normalizedNewScale, mScaleFocusX,
mScaleFocusY, false);
mMagnificationController.setScale(normalizedNewScale, detector.getFocusX(),
detector.getFocusY(), false);
return true;
}
@@ -434,8 +441,8 @@ public final class ScreenMagnifier implements EventStreamTransformation {
}
private void clear() {
mScaleFocusX = -1;
mScaleFocusY = -1;
mInitialScaleFactor = -1;
mScaling = false;
}
}