LatinIME/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboardView.java

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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.keyboard;
import android.content.Context;
import android.content.res.Resources;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import com.android.inputmethod.latin.Constants;
import com.android.inputmethod.latin.R;
import com.android.inputmethod.latin.utils.CoordinateUtils;
/**
* A view that renders a virtual {@link MoreKeysKeyboard}. It handles rendering of keys and
* detecting key presses and touch movements.
*/
public class MoreKeysKeyboardView extends KeyboardView implements MoreKeysPanel {
private final int[] mCoordinates = CoordinateUtils.newInstance();
protected final KeyDetector mKeyDetector;
private Controller mController = EMPTY_CONTROLLER;
protected KeyboardActionListener mListener;
private int mOriginX;
private int mOriginY;
private Key mCurrentKey;
private int mActivePointerId;
public MoreKeysKeyboardView(final Context context, final AttributeSet attrs) {
this(context, attrs, R.attr.moreKeysKeyboardViewStyle);
}
public MoreKeysKeyboardView(final Context context, final AttributeSet attrs,
final int defStyle) {
super(context, attrs, defStyle);
final Resources res = context.getResources();
mKeyDetector = new MoreKeysDetector(
res.getDimension(R.dimen.more_keys_keyboard_slide_allowance));
}
@Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
final Keyboard keyboard = getKeyboard();
if (keyboard != null) {
final int width = keyboard.mOccupiedWidth + getPaddingLeft() + getPaddingRight();
final int height = keyboard.mOccupiedHeight + getPaddingTop() + getPaddingBottom();
setMeasuredDimension(width, height);
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
@Override
public void setKeyboard(final Keyboard keyboard) {
super.setKeyboard(keyboard);
mKeyDetector.setKeyboard(keyboard, -getPaddingLeft(),
-getPaddingTop() + getVerticalCorrection());
}
@Override
public void showMoreKeysPanel(final View parentView, final Controller controller,
final int pointX, final int pointY, final KeyboardActionListener listener) {
mController = controller;
mListener = listener;
final View container = getContainerView();
// The coordinates of panel's left-top corner in parentView's coordinate system.
final int x = pointX - getDefaultCoordX() - container.getPaddingLeft();
final int y = pointY - container.getMeasuredHeight() + container.getPaddingBottom();
parentView.getLocationInWindow(mCoordinates);
// Ensure the horizontal position of the panel does not extend past the screen edges.
final int maxX = parentView.getMeasuredWidth() - container.getMeasuredWidth();
final int panelX = Math.max(0, Math.min(maxX, x)) + CoordinateUtils.x(mCoordinates);
final int panelY = y + CoordinateUtils.y(mCoordinates);
container.setX(panelX);
container.setY(panelY);
mOriginX = x + container.getPaddingLeft();
mOriginY = y + container.getPaddingTop();
controller.onShowMoreKeysPanel(this);
}
/**
* Returns the default x coordinate for showing this panel.
*/
protected int getDefaultCoordX() {
return ((MoreKeysKeyboard)getKeyboard()).getDefaultCoordX();
}
@Override
public void onDownEvent(final int x, final int y, final int pointerId, final long eventTime) {
mActivePointerId = pointerId;
onMoveKeyInternal(x, y, pointerId);
}
@Override
public void onMoveEvent(int x, int y, final int pointerId, long eventTime) {
if (mActivePointerId != pointerId) {
return;
}
final boolean hasOldKey = (mCurrentKey != null);
onMoveKeyInternal(x, y, pointerId);
if (hasOldKey && mCurrentKey == null) {
// If the pointer has moved too far away from any target then cancel the panel.
mController.onCancelMoreKeysPanel(this);
}
}
@Override
public void onUpEvent(final int x, final int y, final int pointerId, final long eventTime) {
if (mCurrentKey != null && mActivePointerId == pointerId) {
updateReleaseKeyGraphics(mCurrentKey);
onCodeInput(mCurrentKey.getCode(), x, y);
mCurrentKey = null;
}
}
/**
* Performs the specific action for this panel when the user presses a key on the panel.
*/
protected void onCodeInput(final int code, final int x, final int y) {
if (code == Constants.CODE_OUTPUT_TEXT) {
mListener.onTextInput(mCurrentKey.getOutputText());
} else if (code != Constants.CODE_UNSPECIFIED) {
mListener.onCodeInput(code, x, y);
}
}
private void onMoveKeyInternal(int x, int y, int pointerId) {
if (mActivePointerId != pointerId) {
// Ignore old pointers when newer pointer is active.
return;
}
final Key oldKey = mCurrentKey;
final Key newKey = mKeyDetector.detectHitKey(x, y);
if (newKey != oldKey) {
mCurrentKey = newKey;
invalidateKey(mCurrentKey);
if (oldKey != null) {
updateReleaseKeyGraphics(oldKey);
}
if (newKey != null) {
updatePressKeyGraphics(newKey);
}
}
}
private void updateReleaseKeyGraphics(final Key key) {
key.onReleased();
invalidateKey(key);
}
private void updatePressKeyGraphics(final Key key) {
key.onPressed();
invalidateKey(key);
}
@Override
public void dismissMoreKeysPanel() {
if (!isShowingInParent()) {
return;
}
mController.onDismissMoreKeysPanel(this);
}
@Override
public int translateX(final int x) {
return x - mOriginX;
}
@Override
public int translateY(final int y) {
return y - mOriginY;
}
@Override
public boolean onTouchEvent(final MotionEvent me) {
final int action = me.getActionMasked();
final long eventTime = me.getEventTime();
final int index = me.getActionIndex();
final int x = (int)me.getX(index);
final int y = (int)me.getY(index);
final int pointerId = me.getPointerId(index);
switch (action) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_POINTER_DOWN:
onDownEvent(x, y, pointerId, eventTime);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
onUpEvent(x, y, pointerId, eventTime);
break;
case MotionEvent.ACTION_MOVE:
onMoveEvent(x, y, pointerId, eventTime);
break;
}
return true;
}
@Override
public View getContainerView() {
return (View)getParent();
}
@Override
public boolean isShowingInParent() {
return (getContainerView().getParent() != null);
}
}