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Move generic hover event handling to KeyboardAccessibilityDelegate 

This is a follow up of I0d73b4cf60.

Change-Id: Iecfe124321682c8fc307ccf4c79e836390403d95
main
Tadashi G. Takaoka 2014-05-20 17:04:23 +09:00
parent 4d146d5e3e
commit f22285006a
2 changed files with 116 additions and 146 deletions
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118
java/src/com/android/inputmethod/accessibility/KeyboardAccessibilityDelegate.java
View File

@ -16,23 +16,28 @@
package com.android.inputmethod.accessibility;
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.view.MotionEvent;
import android.view.View;
import android.view.ViewParent;
import android.view.accessibility.AccessibilityEvent;
import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.KeyDetector;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.KeyboardView;
public abstract class KeyboardAccessibilityDelegate<KV extends KeyboardView>
public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
extends AccessibilityDelegateCompat {
protected final KV mKeyboardView;
protected final KeyDetector mKeyDetector;
private Keyboard mKeyboard;
private KeyboardAccessibilityNodeProvider mAccessibilityNodeProvider;
private Key mLastHoverKey;
public KeyboardAccessibilityDelegate(final KV keyboardView, final KeyDetector keyDetector) {
super();
@ -114,5 +119,114 @@ public abstract class KeyboardAccessibilityDelegate<KV extends KeyboardView>
* @param event The hover event.
* @return {@code true} if the event is handled
*/
public abstract boolean dispatchHoverEvent(final MotionEvent event);
public boolean dispatchHoverEvent(final MotionEvent event) {
final int x = (int) event.getX();
final int y = (int) event.getY();
final Key previousKey = mLastHoverKey;
final Key key = mKeyDetector.detectHitKey(x, y);
mLastHoverKey = 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);
}
//$FALL-THROUGH$
case MotionEvent.ACTION_HOVER_ENTER:
return onHoverKey(key, event);
case MotionEvent.ACTION_HOVER_MOVE:
if (key != previousKey) {
return onTransitionKey(key, previousKey, event);
}
return onHoverKey(key, event);
}
return false;
}
/**
* Simulates a key press by injecting touch an event into the keyboard view.
* This avoids the complexity of trackers and listeners within the keyboard.
*
* @param key The key to press.
*/
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;
}
/**
* Simulates a key release by injecting touch an event into the keyboard view.
* This avoids the complexity of trackers and listeners within the keyboard.
*
* @param key The key to release.
*/
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();
}
/**
* Simulates a transition between two {@link Key}s by sending a HOVER_EXIT on the previous key,
* a HOVER_ENTER on the current key, and a HOVER_MOVE on the current key.
*
* @param currentKey The currently hovered key.
* @param previousKey The previously hovered key.
* @param event The event that triggered the transition.
* @return {@code true} if the event was handled.
*/
private boolean onTransitionKey(final Key currentKey, final Key previousKey,
final MotionEvent event) {
final int savedAction = event.getAction();
event.setAction(MotionEvent.ACTION_HOVER_EXIT);
onHoverKey(previousKey, event);
event.setAction(MotionEvent.ACTION_HOVER_ENTER);
onHoverKey(currentKey, event);
event.setAction(MotionEvent.ACTION_HOVER_MOVE);
final boolean handled = onHoverKey(currentKey, event);
event.setAction(savedAction);
return handled;
}
/**
* Handles a hover event on a key. If {@link Key} extended View, this would be analogous to
* calling View.onHoverEvent(MotionEvent).
*
* @param key The currently hovered key.
* @param event The hover event.
* @return {@code true} if the event was handled.
*/
private boolean onHoverKey(final Key key, final MotionEvent event) {
// Null keys can't receive events.
if (key == null) {
return false;
}
final KeyboardAccessibilityNodeProvider provider = getAccessibilityNodeProvider();
switch (event.getAction()) {
case MotionEvent.ACTION_HOVER_ENTER:
provider.sendAccessibilityEventForKey(
key, AccessibilityEventCompat.TYPE_VIEW_HOVER_ENTER);
provider.performActionForKey(
key, AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS, null);
break;
case MotionEvent.ACTION_HOVER_EXIT:
provider.sendAccessibilityEventForKey(
key, AccessibilityEventCompat.TYPE_VIEW_HOVER_EXIT);
break;
}
return true;
}
}

144
java/src/com/android/inputmethod/accessibility/MainKeyboardAccessibilityDelegate.java
View File

@ -52,19 +52,9 @@ public final class MainKeyboardAccessibilityDelegate
private int mLastKeyboardMode = KEYBOARD_IS_HIDDEN;
private static final int KEYBOARD_IS_HIDDEN = -1;
private Key mLastHoverKey = null;
/**
* Inset in pixels to look for keys when the user's finger exits the keyboard area.
*/
private final int mEdgeSlop;
public MainKeyboardAccessibilityDelegate(final MainKeyboardView mainKeyboardView,
final KeyDetector keyDetector) {
super(mainKeyboardView, keyDetector);
final Context context = mainKeyboardView.getContext();
mEdgeSlop = context.getResources().getDimensionPixelSize(
R.dimen.config_accessibility_edge_slop);
}
/**
@ -191,138 +181,4 @@ public final class MainKeyboardAccessibilityDelegate
sendWindowStateChanged(text);
}
/**
* {@inheritDoc}
*/
@Override
public boolean dispatchHoverEvent(final MotionEvent event) {
final int x = (int) event.getX();
final int y = (int) event.getY();
final Key previousKey = mLastHoverKey;
final Key key;
if (pointInView(x, y)) {
key = mKeyDetector.detectHitKey(x, y);
} else {
key = null;
}
mLastHoverKey = 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);
}
//$FALL-THROUGH$
case MotionEvent.ACTION_HOVER_ENTER:
return onHoverKey(key, event);
case MotionEvent.ACTION_HOVER_MOVE:
if (key != previousKey) {
return onTransitionKey(key, previousKey, event);
}
return onHoverKey(key, event);
}
return false;
}
/**
* Utility method to determine whether the given point, in local coordinates, is inside the
* view, where the area of the view is contracted by the edge slop factor.
*
* @param localX The local x-coordinate.
* @param localY The local y-coordinate.
*/
private boolean pointInView(final int localX, final int localY) {
return (localX >= mEdgeSlop) && (localY >= mEdgeSlop)
&& (localX < (mKeyboardView.getWidth() - mEdgeSlop))
&& (localY < (mKeyboardView.getHeight() - mEdgeSlop));
}
/**
* Simulates a key press by injecting touch an event into the keyboard view.
* This avoids the complexity of trackers and listeners within the keyboard.
*
* @param key The key to press.
*/
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;
}
/**
* Simulates a key release by injecting touch an event into the keyboard view.
* This avoids the complexity of trackers and listeners within the keyboard.
*
* @param key The key to release.
*/
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();
}
/**
* Simulates a transition between two {@link Key}s by sending a HOVER_EXIT on the previous key,
* a HOVER_ENTER on the current key, and a HOVER_MOVE on the current key.
*
* @param currentKey The currently hovered key.
* @param previousKey The previously hovered key.
* @param event The event that triggered the transition.
* @return {@code true} if the event was handled.
*/
private boolean onTransitionKey(final Key currentKey, final Key previousKey,
final MotionEvent event) {
final int savedAction = event.getAction();
event.setAction(MotionEvent.ACTION_HOVER_EXIT);
onHoverKey(previousKey, event);
event.setAction(MotionEvent.ACTION_HOVER_ENTER);
onHoverKey(currentKey, event);
event.setAction(MotionEvent.ACTION_HOVER_MOVE);
final boolean handled = onHoverKey(currentKey, event);
event.setAction(savedAction);
return handled;
}
/**
* Handles a hover event on a key. If {@link Key} extended View, this would be analogous to
* calling View.onHoverEvent(MotionEvent).
*
* @param key The currently hovered key.
* @param event The hover event.
* @return {@code true} if the event was handled.
*/
private boolean onHoverKey(final Key key, final MotionEvent event) {
// Null keys can't receive events.
if (key == null) {
return false;
}
final KeyboardAccessibilityNodeProvider provider = getAccessibilityNodeProvider();
switch (event.getAction()) {
case MotionEvent.ACTION_HOVER_ENTER:
provider.sendAccessibilityEventForKey(
key, AccessibilityEventCompat.TYPE_VIEW_HOVER_ENTER);
provider.performActionForKey(
key, AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS, null);
break;
case MotionEvent.ACTION_HOVER_EXIT:
provider.sendAccessibilityEventForKey(
key, AccessibilityEventCompat.TYPE_VIEW_HOVER_EXIT);
break;
}
return true;
}
}