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Merge "Support fine grained hover event handling"

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This commit is contained in:
Tadashi G. Takaoka 2014-05-28 05:53:52 +00:00 committed by Android (Google) Code Review
commit f2b995769b
1 changed files with 113 additions and 57 deletions
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152
java/src/com/android/inputmethod/accessibility/KeyboardAccessibilityDelegate.java
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@ -17,11 +17,11 @@
package com.android.inputmethod.accessibility;
import android.content.Context;
import android.os.SystemClock;
import android.support.v4.view.AccessibilityDelegateCompat;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.accessibility.AccessibilityEventCompat;
import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewParent;
@ -31,6 +31,7 @@ import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.KeyDetector;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.KeyboardView;
import com.android.inputmethod.keyboard.PointerTracker;
public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
extends AccessibilityDelegateCompat {
@ -66,10 +67,18 @@ public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
mKeyboard = keyboard;
}
protected Keyboard getKeyboard() {
protected final Keyboard getKeyboard() {
return mKeyboard;
}
protected final void setCurrentHoverKey(final Key key) {
mCurrentHoverKey = key;
}
protected final Key getCurrentHoverKey() {
return mCurrentHoverKey;
}
/**
* Sends a window state change event with the specified string resource id.
*
@ -127,6 +136,19 @@ public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
return mAccessibilityNodeProvider;
}
/**
* Get a key that a hover event is on.
*
* @param event The hover event.
* @return key The key that the <code>event</code> is on.
*/
protected final Key getHoverKey(final MotionEvent event) {
final int actionIndex = event.getActionIndex();
final int x = (int)event.getX(actionIndex);
final int y = (int)event.getY(actionIndex);
return mKeyDetector.detectHitKey(x, y);
}
/**
* Receives hover events when touch exploration is turned on in SDK versions ICS and higher.
*
@ -134,29 +156,44 @@ public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
* @return {@code true} if the event is handled.
*/
public boolean onHoverEvent(final MotionEvent event) {
final int x = (int) event.getX();
final int y = (int) event.getY();
final Key previousKey = mCurrentHoverKey;
final Key key = mKeyDetector.detectHitKey(x, y);
mCurrentHoverKey = key;
switch (event.getAction()) {
case MotionEvent.ACTION_HOVER_EXIT:
// Make sure we're not getting an EXIT event because the user slid
// off the keyboard area, then force a key press.
if (key != null) {
final long downTime = simulateKeyPress(key);
simulateKeyRelease(key, downTime);
onHoverExitKey(key);
}
mCurrentHoverKey = null;
break;
switch (event.getActionMasked()) {
case MotionEvent.ACTION_HOVER_ENTER:
onHoverEnter(event);
break;
case MotionEvent.ACTION_HOVER_MOVE:
onHoverMove(event);
break;
case MotionEvent.ACTION_HOVER_EXIT:
onHoverExit(event);
break;
default:
Log.w(getClass().getSimpleName(), "Unknown hover event: " + event);
break;
}
return true;
}
/**
* Process {@link MotionEvent#ACTION_HOVER_ENTER} event.
*
* @param event A hover enter event.
*/
protected void onHoverEnter(final MotionEvent event) {
final Key key = getHoverKey(event);
if (key != null) {
onHoverEnterKey(key);
}
break;
case MotionEvent.ACTION_HOVER_MOVE:
setCurrentHoverKey(key);
}
/**
* Process {@link MotionEvent#ACTION_HOVER_MOVE} event.
*
* @param event A hover move event.
*/
protected void onHoverMove(final MotionEvent event) {
final Key previousKey = getCurrentHoverKey();
final Key key = getHoverKey(event);
if (key != previousKey) {
if (previousKey != null) {
onHoverExitKey(previousKey);
@ -168,43 +205,58 @@ public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
if (key != null) {
onHoverMoveKey(key);
}
break;
}
return true;
setCurrentHoverKey(key);
}
/**
* Simulates a key press by injecting touch an event into the keyboard view.
* This avoids the complexity of trackers and listeners within the keyboard.
* Process {@link MotionEvent#ACTION_HOVER_EXIT} event.
*
* @param key The key to press.
* @return the event time of the simulated key press.
* @param event A hover exit event.
*/
private long simulateKeyPress(final Key key) {
final int x = key.getHitBox().centerX();
final int y = key.getHitBox().centerY();
final long downTime = SystemClock.uptimeMillis();
final MotionEvent downEvent = MotionEvent.obtain(
downTime, downTime, MotionEvent.ACTION_DOWN, x, y, 0);
mKeyboardView.onTouchEvent(downEvent);
downEvent.recycle();
return downTime;
protected void onHoverExit(final MotionEvent event) {
final Key key = getHoverKey(event);
// Make sure we're not getting an EXIT event because the user slid
// off the keyboard area, then force a key press.
if (key != null) {
simulateTouchEvent(MotionEvent.ACTION_DOWN, event);
simulateTouchEvent(MotionEvent.ACTION_UP, event);
onHoverExitKey(key);
}
setCurrentHoverKey(null);
}
/**
* Simulates a key release by injecting touch an event into the keyboard view.
* This avoids the complexity of trackers and listeners within the keyboard.
* Simulating a touch event by injecting a synthesized touch event into {@link PointerTracker}.
*
* @param key The key to release.
* @param downTime the event time of the key press.
* @param touchAction The action of the synthesizing touch event.
* @param hoverEvent The base hover event from that the touch event is synthesized.
*/
private void simulateKeyRelease(final Key key, final long downTime) {
final int x = key.getHitBox().centerX();
final int y = key.getHitBox().centerY();
final MotionEvent upEvent = MotionEvent.obtain(
downTime, SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, x, y, 0);
mKeyboardView.onTouchEvent(upEvent);
upEvent.recycle();
protected void simulateTouchEvent(final int touchAction, final MotionEvent hoverEvent) {
final MotionEvent touchEvent = synthesizeTouchEvent(touchAction, hoverEvent);
final int actionIndex = touchEvent.getActionIndex();
final int pointerId = touchEvent.getPointerId(actionIndex);
final PointerTracker tracker = PointerTracker.getPointerTracker(pointerId);
tracker.processMotionEvent(touchEvent, mKeyDetector);
touchEvent.recycle();
}
/**
* Synthesize a touch event from a hover event.
*
* @param touchAction The action of the synthesizing touch event.
* @param event The base hover event from that the touch event is synthesized.
* @return The synthesized touch event of <code>touchAction</code> that has pointer information
* of <code>event</code>.
*/
protected static MotionEvent synthesizeTouchEvent(final int touchAction,
final MotionEvent event) {
final long downTime = event.getDownTime();
final long eventTime = event.getEventTime();
final int actionIndex = event.getActionIndex();
final float x = event.getX(actionIndex);
final float y = event.getY(actionIndex);
final int pointerId = event.getPointerId(actionIndex);
return MotionEvent.obtain(downTime, eventTime, touchAction, x, y, pointerId);
}
/**
@ -213,6 +265,8 @@ public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
* @param key The currently hovered key.
*/
protected void onHoverEnterKey(final Key key) {
key.onPressed();
mKeyboardView.invalidateKey(key);
final KeyboardAccessibilityNodeProvider provider = getAccessibilityNodeProvider();
provider.sendAccessibilityEventForKey(key, AccessibilityEventCompat.TYPE_VIEW_HOVER_ENTER);
provider.performActionForKey(key, AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS);
@ -231,6 +285,8 @@ public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
* @param key The currently hovered key.
*/
protected void onHoverExitKey(final Key key) {
key.onReleased();
mKeyboardView.invalidateKey(key);
final KeyboardAccessibilityNodeProvider provider = getAccessibilityNodeProvider();
provider.sendAccessibilityEventForKey(key, AccessibilityEventCompat.TYPE_VIEW_HOVER_EXIT);
}