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Introduce a delay for key-press feedback on the Emoji palette

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Currently key-press effect such as highlight and vibration
occur even when a user want to scroll the Emoji palette.
To mitigate this situation, this patch introduces a short delay
for key-press feedback on the Emoji palette.

This is not an ideal solution but should be better than now.

BUG: 11103083
Change-Id: I1fa4514d742eb37f36fef60e6beabbc5eaa1653a
This commit is contained in:
Yohei Yukawa 2014-01-31 14:10:42 +09:00
parent be18530acf
commit 94797fb3a6
1 changed files with 42 additions and 10 deletions
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52
java/src/com/android/inputmethod/keyboard/internal/EmojiPageKeyboardView.java
View File

@ -17,6 +17,7 @@
package com.android.inputmethod.keyboard.internal;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
@ -35,16 +36,19 @@ import com.android.inputmethod.latin.R;
// TODO: Implement key popup preview.
public final class EmojiPageKeyboardView extends KeyboardView implements
GestureDetector.OnGestureListener {
private static final long KEY_PRESS_DELAY_TIME = 250; // msec
private static final long KEY_RELEASE_DELAY_TIME = 30; // msec
public interface OnKeyEventListener {
public void onPressKey(Key key);
public void onReleaseKey(Key key);
}
private static final OnKeyEventListener EMPTY_LISTENER = new OnKeyEventListener() {
@Override
public void onPressKey(final Key key) {}
@Override
public void onReleaseKey(final Key key) {}
@Override
public void onPressKey(final Key key) {}
@Override
public void onReleaseKey(final Key key) {}
};
private OnKeyEventListener mListener = EMPTY_LISTENER;
@ -60,6 +64,7 @@ public final class EmojiPageKeyboardView extends KeyboardView implements
super(context, attrs, defStyle);
mGestureDetector = new GestureDetector(context, this);
mGestureDetector.setIsLongpressEnabled(false /* isLongpressEnabled */);
mHandler = new Handler();
}
public void setOnKeyEventListener(final OnKeyEventListener listener) {
@ -92,6 +97,8 @@ public final class EmojiPageKeyboardView extends KeyboardView implements
// {@link GestureEnabler#OnGestureListener} methods.
private Key mCurrentKey;
private Runnable mPendingKeyDown;
private final Handler mHandler;
private Key getKey(final MotionEvent e) {
final int index = e.getActionIndex();
@ -101,6 +108,8 @@ public final class EmojiPageKeyboardView extends KeyboardView implements
}
public void releaseCurrentKey() {
mHandler.removeCallbacks(mPendingKeyDown);
mPendingKeyDown = null;
final Key currentKey = mCurrentKey;
if (currentKey == null) {
return;
@ -118,9 +127,17 @@ public final class EmojiPageKeyboardView extends KeyboardView implements
if (key == null) {
return false;
}
key.onPressed();
invalidateKey(key);
mListener.onPressKey(key);
// Do not trigger key-down effect right now in case this is actually a fling action.
mPendingKeyDown = new Runnable() {
@Override
public void run() {
mPendingKeyDown = null;
key.onPressed();
invalidateKey(key);
mListener.onPressKey(key);
}
};
mHandler.postDelayed(mPendingKeyDown, KEY_PRESS_DELAY_TIME);
return false;
}
@ -132,13 +149,28 @@ public final class EmojiPageKeyboardView extends KeyboardView implements
@Override
public boolean onSingleTapUp(final MotionEvent e) {
final Key key = getKey(e);
final Runnable pendingKeyDown = mPendingKeyDown;
final Key currentKey = mCurrentKey;
releaseCurrentKey();
if (key == null) {
return false;
}
key.onReleased();
invalidateKey(key);
mListener.onReleaseKey(key);
if (key == currentKey && pendingKeyDown != null) {
pendingKeyDown.run();
// Trigger key-release event a little later so that a user can see visual feedback.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
key.onReleased();
invalidateKey(key);
mListener.onReleaseKey(key);
}
}, KEY_RELEASE_DELAY_TIME);
} else {
key.onReleased();
invalidateKey(key);
mListener.onReleaseKey(key);
}
return true;
}