/*
* Copyright (C) 2015 Jorge Ruesga
*
* 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.ruesga.android.wallpapers.photophase.widgets;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.BitmapFactory;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import com.ruesga.android.wallpapers.photophase.R;
/**
* The hold view to resize a frame. A square with 4 handles in every border
* to drag and resize a view
*/
public class ResizeFrame extends FrameLayout {
/**
* An interface to communicate resize event states
*/
public interface OnResizeListener {
/**
* Called when the resize is going to start
*
* @param mode The resize mode (left, right, top, bottom)
* @see Gravity
*/
void onStartResize(int mode);
/**
* Called when the resize is going to start
*
* @param mode The resize mode (left, right, top, bottom)
* @param delta The delta motion
* @see Gravity
*/
void onResize(int mode, float delta);
/**
* Called when the resize was ended
*
* @param mode The resize mode (left, right, top, bottom)
* @see Gravity
*/
void onEndResize(int mode);
/**
* Called when the resize was cancelled
*
* @see Gravity
*/
void onCancel();
}
private int mNeededPadding;
private ImageView mLeftHandle;
private ImageView mRightHandle;
private ImageView mTopHandle;
private ImageView mBottomHandle;
private float mExtraHandlingSpace;
private View mHandle;
private float mLastTouchX;
private float mLastTouchY;
private OnResizeListener mOnResizeListener;
/**
* Constructor of <code>ResizeFrame</code>.
*
* @param context The current context
*/
public ResizeFrame(Context context) {
super(context);
init(context);
}
/**
* Constructor of <code>ResizeFrame</code>.
*
* @param context The current context
* @param attrs The attributes of the XML tag that is inflating the view.
*/
public ResizeFrame(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
/**
* Constructor of <code>ResizeFrame</code>.
*
* @param context The current context
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyle The default style to apply to this view. If 0, no style
* will be applied (beyond what is included in the theme). This may
* either be an attribute resource, whose value will be retrieved
* from the current theme, or an explicit style resource.
*/
public ResizeFrame(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
/**
* Method that initializes the view
*/
@SuppressLint("RtlHardcoded")
private void init(Context context) {
final Resources res = context.getResources();
final int handleMargin = res.getDimensionPixelSize(R.dimen.resize_frame_handle_margin);
mExtraHandlingSpace = res.getDimension(R.dimen.resize_frame_extra_handling_space);
mNeededPadding = handleMargin;
int overlayColor = ContextCompat.getColor(context, R.color.color_primary);
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, R.drawable.resize_frame_handle, o);
mNeededPadding = handleMargin + (o.outWidth / 2);
setBackgroundResource(R.drawable.resize_frame_shadow);
Drawable dw = ContextCompat.getDrawable(context, R.drawable.resize_frame);
dw.setColorFilter(overlayColor, PorterDuff.Mode.SRC_ATOP);
setForeground(dw);
setPadding(0, 0, 0, 0);
LayoutParams lp;
mLeftHandle = new ImageView(context);
mLeftHandle.setImageResource(R.drawable.resize_frame_handle);
mLeftHandle.setColorFilter(overlayColor, PorterDuff.Mode.SRC_ATOP);
mLeftHandle.setTag(Gravity.LEFT);
lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
Gravity.LEFT | Gravity.CENTER_VERTICAL);
lp.leftMargin = handleMargin;
addView(mLeftHandle, lp);
mRightHandle = new ImageView(context);
mRightHandle.setImageResource(R.drawable.resize_frame_handle);
mRightHandle.setColorFilter(overlayColor, PorterDuff.Mode.SRC_ATOP);
mRightHandle.setTag(Gravity.RIGHT);
lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
Gravity.RIGHT | Gravity.CENTER_VERTICAL);
lp.rightMargin = handleMargin;
addView(mRightHandle, lp);
mTopHandle = new ImageView(context);
mTopHandle.setImageResource(R.drawable.resize_frame_handle);
mTopHandle.setColorFilter(overlayColor, PorterDuff.Mode.SRC_ATOP);
mTopHandle.setTag(Gravity.TOP);
lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
Gravity.CENTER_HORIZONTAL | Gravity.TOP);
lp.topMargin = handleMargin;
addView(mTopHandle, lp);
mBottomHandle = new ImageView(context);
mBottomHandle.setImageResource(R.drawable.resize_frame_handle);
mBottomHandle.setColorFilter(overlayColor, PorterDuff.Mode.SRC_ATOP);
mBottomHandle.setTag(Gravity.BOTTOM);
lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM);
lp.bottomMargin = handleMargin;
addView(mBottomHandle, lp);
}
/**
* Method that set the callback for resize events
*
* @param onResizeListener The callback
*/
public void setOnResizeListener(OnResizeListener onResizeListener) {
mOnResizeListener = onResizeListener;
}
/**
* Method that hides the view
*/
public void hide() {
setVisibility(View.GONE);
}
/**
* Method that shows the view
*/
public void show() {
setVisibility(View.VISIBLE);
}
/**
* Method that returns the extra padding to draw the handlers
*
* @return The extra padding space
*/
public int getNeededPadding() {
return mNeededPadding;
}
/**
* {@inheritDoc}
*/
@Override
@SuppressLint("RtlHardcoded")
public boolean onTouchEvent(@NonNull MotionEvent ev) {
final int action = ev.getAction();
final float x = ev.getX();
final float y = ev.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
mHandle = getHandleFromCoordinates(x, y);
if (mHandle != null) {
// Start moving the resize frame
mLastTouchX = x;
mLastTouchY = y;
// Start motion
if (mOnResizeListener != null) {
mOnResizeListener.onStartResize((Integer) mHandle.getTag());
}
return true;
}
break;
case MotionEvent.ACTION_MOVE:
if (mHandle != null) {
// Resize
if (mOnResizeListener != null) {
int handle = (Integer) mHandle.getTag();
float delta = handle == Gravity.RIGHT || handle == Gravity.LEFT
? x - mLastTouchX
: y - mLastTouchY;
mOnResizeListener.onResize(handle, delta);
ViewCompat.postInvalidateOnAnimation(this);
}
mLastTouchX = x;
mLastTouchY = y;
return true;
}
break;
case MotionEvent.ACTION_UP:
if (mHandle != null) {
if (mOnResizeListener != null) {
mOnResizeListener.onEndResize((Integer) mHandle.getTag());
cancelMotion();
return true;
}
}
//$FALL-THROUGH$
case MotionEvent.ACTION_CANCEL:
cancelMotion();
break;
default:
break;
}
return false;
}
/**
* Cancel motions
*/
private void cancelMotion() {
mHandle = null;
mLastTouchX = 0;
mLastTouchY = 0;
if (mOnResizeListener != null) {
mOnResizeListener.onCancel();
}
}
/**
* Method that returns the resize handle touch from the the screen coordinates
*
* @param x The x coordinate
* @param y The y coordinate
* @return View The handle view or null if no handle touched
*/
private View getHandleFromCoordinates(float x, float y) {
final View[] handles = {mLeftHandle, mRightHandle, mTopHandle, mBottomHandle};
for (View v : handles) {
if ((v.getLeft() - mExtraHandlingSpace) < x && (v.getRight() + mExtraHandlingSpace) > x &&
(v.getTop() - mExtraHandlingSpace) < y && (v.getBottom() + mExtraHandlingSpace) > y) {
return v;
}
}
return null;
}
}