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/*
* Copyright (C) 2015 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.documentsui;
import android.graphics.Point;
import android.support.v7.widget.RecyclerView;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
/**
* Utility code for dealing with MotionEvents.
*/
public final class Events {
/**
* Returns true if event was triggered by a mouse.
*/
public static boolean isMouseEvent(MotionEvent e) {
return isMouseType(e.getToolType(0));
}
/**
* Returns true if event was triggered by a finger or stylus touch.
*/
public static boolean isTouchEvent(MotionEvent e) {
return isTouchType(e.getToolType(0));
}
/**
* Returns true if event was triggered by a mouse.
*/
public static boolean isMouseType(int toolType) {
return toolType == MotionEvent.TOOL_TYPE_MOUSE;
}
/**
* Returns true if event was triggered by a finger or stylus touch.
*/
public static boolean isTouchType(int toolType) {
return toolType == MotionEvent.TOOL_TYPE_FINGER
|| toolType == MotionEvent.TOOL_TYPE_STYLUS;
}
/**
* Returns true if event was triggered by a finger or stylus touch.
*/
public static boolean isActionDown(MotionEvent e) {
return e.getActionMasked() == MotionEvent.ACTION_DOWN;
}
/**
* Returns true if event was triggered by a finger or stylus touch.
*/
public static boolean isActionUp(MotionEvent e) {
return e.getActionMasked() == MotionEvent.ACTION_UP;
}
/**
* Returns true if the shift is pressed.
*/
public boolean isShiftPressed(MotionEvent e) {
return hasShiftBit(e.getMetaState());
}
/**
* Whether or not the given keyCode represents a navigation keystroke (e.g. up, down, home).
*
* @param keyCode
* @return
*/
public static boolean isNavigationKeyCode(int keyCode) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_MOVE_HOME:
case KeyEvent.KEYCODE_MOVE_END:
case KeyEvent.KEYCODE_PAGE_UP:
case KeyEvent.KEYCODE_PAGE_DOWN:
return true;
default:
return false;
}
}
/**
* Returns true if the "SHIFT" bit is set.
*/
public static boolean hasShiftBit(int metaState) {
return (metaState & KeyEvent.META_SHIFT_ON) != 0;
}
/**
* A facade over MotionEvent primarily designed to permit for unit testing
* of related code.
*/
public interface InputEvent {
boolean isMouseEvent();
boolean isPrimaryButtonPressed();
boolean isSecondaryButtonPressed();
boolean isShiftKeyDown();
/** Returns true if the action is the initial press of a mouse or touch. */
boolean isActionDown();
/** Returns true if the action is the final release of a mouse or touch. */
boolean isActionUp();
Point getOrigin();
/** Returns true if the there is an item under the finger/cursor. */
boolean isOverItem();
/** Returns the adapter position of the item under the finger/cursor. */
int getItemPosition();
}
public static final class MotionInputEvent implements InputEvent {
private final MotionEvent mEvent;
private final int mPosition;
public MotionInputEvent(MotionEvent event, RecyclerView view) {
mEvent = event;
// Consider determining position lazily as an optimization.
View child = view.findChildViewUnder(mEvent.getX(), mEvent.getY());
mPosition = (child!= null)
? view.getChildAdapterPosition(child)
: RecyclerView.NO_POSITION;
}
@Override
public boolean isMouseEvent() {
return Events.isMouseEvent(mEvent);
}
@Override
public boolean isPrimaryButtonPressed() {
return mEvent.isButtonPressed(MotionEvent.BUTTON_PRIMARY);
}
@Override
public boolean isSecondaryButtonPressed() {
return mEvent.isButtonPressed(MotionEvent.BUTTON_SECONDARY);
}
@Override
public boolean isShiftKeyDown() {
return Events.hasShiftBit(mEvent.getMetaState());
}
@Override
public boolean isActionDown() {
return mEvent.getActionMasked() == MotionEvent.ACTION_DOWN;
}
@Override
public boolean isActionUp() {
return mEvent.getActionMasked() == MotionEvent.ACTION_UP;
}
@Override
public Point getOrigin() {
return new Point((int) mEvent.getX(), (int) mEvent.getY());
}
@Override
public boolean isOverItem() {
return getItemPosition() != RecyclerView.NO_POSITION;
}
@Override
public int getItemPosition() {
return mPosition;
}
@Override
public String toString() {
return new StringBuilder()
.append("MotionInputEvent {")
.append("isMouseEvent=").append(isMouseEvent())
.append(" isPrimaryButtonPressed=").append(isPrimaryButtonPressed())
.append(" isSecondaryButtonPressed=").append(isSecondaryButtonPressed())
.append(" isShiftKeyDown=").append(isShiftKeyDown())
.append(" isActionDown=").append(isActionDown())
.append(" isActionUp=").append(isActionUp())
.append(" getOrigin=").append(getOrigin())
.append(" isOverItem=").append(isOverItem())
.append(" getItemPosition=").append(getItemPosition())
.append("}")
.toString();
}
}
}
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