/*
* Copyright (C) 2008 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.launcher3;
import android.animation.FloatArrayEvaluator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.annotation.TargetApi;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.os.Build;
import android.view.View;
import android.view.animation.DecelerateInterpolator;
import com.android.launcher3.util.Thunk;
import java.util.Arrays;
public class DragView extends View {
public static int COLOR_CHANGE_DURATION = 120;
@Thunk static float sDragAlpha = 1f;
private Bitmap mBitmap;
private Bitmap mCrossFadeBitmap;
@Thunk Paint mPaint;
private int mRegistrationX;
private int mRegistrationY;
private Point mDragVisualizeOffset = null;
private Rect mDragRegion = null;
private DragLayer mDragLayer = null;
private boolean mHasDrawn = false;
@Thunk float mCrossFadeProgress = 0f;
ValueAnimator mAnim;
@Thunk float mOffsetX = 0.0f;
@Thunk float mOffsetY = 0.0f;
private float mInitialScale = 1f;
// The intrinsic icon scale factor is the scale factor for a drag icon over the workspace
// size. This is ignored for non-icons.
private float mIntrinsicIconScale = 1f;
@Thunk float[] mCurrentFilter;
private ValueAnimator mFilterAnimator;
/**
* Construct the drag view.
* <p>
* The registration point is the point inside our view that the touch events should
* be centered upon.
*
* @param launcher The Launcher instance
* @param bitmap The view that we're dragging around. We scale it up when we draw it.
* @param registrationX The x coordinate of the registration point.
* @param registrationY The y coordinate of the registration point.
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public DragView(Launcher launcher, Bitmap bitmap, int registrationX, int registrationY,
int left, int top, int width, int height, final float initialScale) {
super(launcher);
mDragLayer = launcher.getDragLayer();
mInitialScale = initialScale;
final Resources res = getResources();
final float scaleDps = res.getDimensionPixelSize(R.dimen.dragViewScale);
final float scale = (width + scaleDps) / width;
// Set the initial scale to avoid any jumps
setScaleX(initialScale);
setScaleY(initialScale);
// Animate the view into the correct position
mAnim = LauncherAnimUtils.ofFloat(this, 0f, 1f);
mAnim.setDuration(150);
mAnim.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
final float value = (Float) animation.getAnimatedValue();
final int deltaX = (int) (-mOffsetX);
final int deltaY = (int) (-mOffsetY);
mOffsetX += deltaX;
mOffsetY += deltaY;
setScaleX(initialScale + (value * (scale - initialScale)));
setScaleY(initialScale + (value * (scale - initialScale)));
if (sDragAlpha != 1f) {
setAlpha(sDragAlpha * value + (1f - value));
}
if (getParent() == null) {
animation.cancel();
} else {
setTranslationX(getTranslationX() + deltaX);
setTranslationY(getTranslationY() + deltaY);
}
}
});
mBitmap = Bitmap.createBitmap(bitmap, left, top, width, height);
setDragRegion(new Rect(0, 0, width, height));
// The point in our scaled bitmap that the touch events are located
mRegistrationX = registrationX;
mRegistrationY = registrationY;
// Force a measure, because Workspace uses getMeasuredHeight() before the layout pass
int ms = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
measure(ms, ms);
mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
if (Utilities.ATLEAST_LOLLIPOP) {
setElevation(getResources().getDimension(R.dimen.drag_elevation));
}
}
/** Sets the scale of the view over the normal workspace icon size. */
public void setIntrinsicIconScaleFactor(float scale) {
mIntrinsicIconScale = scale;
}
public float getIntrinsicIconScaleFactor() {
return mIntrinsicIconScale;
}
public float getOffsetY() {
return mOffsetY;
}
public int getDragRegionLeft() {
return mDragRegion.left;
}
public int getDragRegionTop() {
return mDragRegion.top;
}
public int getDragRegionWidth() {
return mDragRegion.width();
}
public int getDragRegionHeight() {
return mDragRegion.height();
}
public void setDragVisualizeOffset(Point p) {
mDragVisualizeOffset = p;
}
public Point getDragVisualizeOffset() {
return mDragVisualizeOffset;
}
public void setDragRegion(Rect r) {
mDragRegion = r;
}
public Rect getDragRegion() {
return mDragRegion;
}
public float getInitialScale() {
return mInitialScale;
}
public void updateInitialScaleToCurrentScale() {
mInitialScale = getScaleX();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(mBitmap.getWidth(), mBitmap.getHeight());
}
@Override
protected void onDraw(Canvas canvas) {
@SuppressWarnings("all") // suppress dead code warning
final boolean debug = false;
if (debug) {
Paint p = new Paint();
p.setStyle(Paint.Style.FILL);
p.setColor(0x66ffffff);
canvas.drawRect(0, 0, getWidth(), getHeight(), p);
}
mHasDrawn = true;
boolean crossFade = mCrossFadeProgress > 0 && mCrossFadeBitmap != null;
if (crossFade) {
int alpha = crossFade ? (int) (255 * (1 - mCrossFadeProgress)) : 255;
mPaint.setAlpha(alpha);
}
canvas.drawBitmap(mBitmap, 0.0f, 0.0f, mPaint);
if (crossFade) {
mPaint.setAlpha((int) (255 * mCrossFadeProgress));
canvas.save();
float sX = (mBitmap.getWidth() * 1.0f) / mCrossFadeBitmap.getWidth();
float sY = (mBitmap.getHeight() * 1.0f) / mCrossFadeBitmap.getHeight();
canvas.scale(sX, sY);
canvas.drawBitmap(mCrossFadeBitmap, 0.0f, 0.0f, mPaint);
canvas.restore();
}
}
public void setCrossFadeBitmap(Bitmap crossFadeBitmap) {
mCrossFadeBitmap = crossFadeBitmap;
}
public void crossFade(int duration) {
ValueAnimator va = LauncherAnimUtils.ofFloat(this, 0f, 1f);
va.setDuration(duration);
va.setInterpolator(new DecelerateInterpolator(1.5f));
va.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mCrossFadeProgress = animation.getAnimatedFraction();
}
});
va.start();
}
public void setColor(int color) {
if (mPaint == null) {
mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
}
if (color != 0) {
ColorMatrix m1 = new ColorMatrix();
m1.setSaturation(0);
ColorMatrix m2 = new ColorMatrix();
setColorScale(color, m2);
m1.postConcat(m2);
if (Utilities.ATLEAST_LOLLIPOP) {
animateFilterTo(m1.getArray());
} else {
mPaint.setColorFilter(new ColorMatrixColorFilter(m1));
invalidate();
}
} else {
if (!Utilities.ATLEAST_LOLLIPOP || mCurrentFilter == null) {
mPaint.setColorFilter(null);
invalidate();
} else {
animateFilterTo(new ColorMatrix().getArray());
}
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void animateFilterTo(float[] targetFilter) {
float[] oldFilter = mCurrentFilter == null ? new ColorMatrix().getArray() : mCurrentFilter;
mCurrentFilter = Arrays.copyOf(oldFilter, oldFilter.length);
if (mFilterAnimator != null) {
mFilterAnimator.cancel();
}
mFilterAnimator = ValueAnimator.ofObject(new FloatArrayEvaluator(mCurrentFilter),
oldFilter, targetFilter);
mFilterAnimator.setDuration(COLOR_CHANGE_DURATION);
mFilterAnimator.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mPaint.setColorFilter(new ColorMatrixColorFilter(mCurrentFilter));
invalidate();
}
});
mFilterAnimator.start();
}
public boolean hasDrawn() {
return mHasDrawn;
}
@Override
public void setAlpha(float alpha) {
super.setAlpha(alpha);
mPaint.setAlpha((int) (255 * alpha));
invalidate();
}
/**
* Create a window containing this view and show it.
*
* @param windowToken obtained from v.getWindowToken() from one of your views
* @param touchX the x coordinate the user touched in DragLayer coordinates
* @param touchY the y coordinate the user touched in DragLayer coordinates
*/
public void show(int touchX, int touchY) {
mDragLayer.addView(this);
// Start the pick-up animation
DragLayer.LayoutParams lp = new DragLayer.LayoutParams(0, 0);
lp.width = mBitmap.getWidth();
lp.height = mBitmap.getHeight();
lp.customPosition = true;
setLayoutParams(lp);
setTranslationX(touchX - mRegistrationX);
setTranslationY(touchY - mRegistrationY);
// Post the animation to skip other expensive work happening on the first frame
post(new Runnable() {
public void run() {
mAnim.start();
}
});
}
public void cancelAnimation() {
if (mAnim != null && mAnim.isRunning()) {
mAnim.cancel();
}
}
public void resetLayoutParams() {
mOffsetX = mOffsetY = 0;
requestLayout();
}
/**
* Move the window containing this view.
*
* @param touchX the x coordinate the user touched in DragLayer coordinates
* @param touchY the y coordinate the user touched in DragLayer coordinates
*/
void move(int touchX, int touchY) {
setTranslationX(touchX - mRegistrationX + (int) mOffsetX);
setTranslationY(touchY - mRegistrationY + (int) mOffsetY);
}
void remove() {
if (getParent() != null) {
mDragLayer.removeView(DragView.this);
}
}
public static void setColorScale(int color, ColorMatrix target) {
target.setScale(Color.red(color) / 255f, Color.green(color) / 255f,
Color.blue(color) / 255f, Color.alpha(color) / 255f);
}
}