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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.launcher2;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.drawable.TransitionDrawable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.LinearInterpolator;
import com.android.launcher.R;
public class DeleteDropTarget extends ButtonDropTarget {
private static int DELETE_ANIMATION_DURATION = 285;
private static int FLING_DELETE_ANIMATION_DURATION = 350;
private static float FLING_TO_DELETE_FRICTION = 0.035f;
private static int MODE_FLING_DELETE_TO_TRASH = 0;
private static int MODE_FLING_DELETE_ALONG_VECTOR = 1;
private final int mFlingDeleteMode = MODE_FLING_DELETE_ALONG_VECTOR;
private ColorStateList mOriginalTextColor;
private TransitionDrawable mUninstallDrawable;
private TransitionDrawable mRemoveDrawable;
private TransitionDrawable mCurrentDrawable;
public DeleteDropTarget(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DeleteDropTarget(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
// Get the drawable
mOriginalTextColor = getTextColors();
// Get the hover color
Resources r = getResources();
mHoverColor = r.getColor(R.color.delete_target_hover_tint);
mUninstallDrawable = (TransitionDrawable)
r.getDrawable(R.drawable.uninstall_target_selector);
mRemoveDrawable = (TransitionDrawable) r.getDrawable(R.drawable.remove_target_selector);
mRemoveDrawable.setCrossFadeEnabled(true);
mUninstallDrawable.setCrossFadeEnabled(true);
// The current drawable is set to either the remove drawable or the uninstall drawable
// and is initially set to the remove drawable, as set in the layout xml.
mCurrentDrawable = (TransitionDrawable) getCurrentDrawable();
// Remove the text in the Phone UI in landscape
int orientation = getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
if (!LauncherApplication.isScreenLarge()) {
setText("");
}
}
}
private boolean isAllAppsApplication(DragSource source, Object info) {
return (source instanceof AppsCustomizePagedView) && (info instanceof ApplicationInfo);
}
private boolean isAllAppsWidget(DragSource source, Object info) {
if (source instanceof AppsCustomizePagedView) {
if (info instanceof PendingAddItemInfo) {
PendingAddItemInfo addInfo = (PendingAddItemInfo) info;
switch (addInfo.itemType) {
case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
return true;
}
}
}
return false;
}
private boolean isDragSourceWorkspaceOrFolder(DragObject d) {
return (d.dragSource instanceof Workspace) || (d.dragSource instanceof Folder);
}
private boolean isWorkspaceOrFolderApplication(DragObject d) {
return isDragSourceWorkspaceOrFolder(d) && (d.dragInfo instanceof ShortcutInfo);
}
private boolean isWorkspaceOrFolderWidget(DragObject d) {
return isDragSourceWorkspaceOrFolder(d) && (d.dragInfo instanceof LauncherAppWidgetInfo);
}
private boolean isWorkspaceFolder(DragObject d) {
return (d.dragSource instanceof Workspace) && (d.dragInfo instanceof FolderInfo);
}
private void setHoverColor() {
mCurrentDrawable.startTransition(mTransitionDuration);
setTextColor(mHoverColor);
}
private void resetHoverColor() {
mCurrentDrawable.resetTransition();
setTextColor(mOriginalTextColor);
}
@Override
public boolean acceptDrop(DragObject d) {
// We can remove everything including App shortcuts, folders, widgets, etc.
return true;
}
@Override
public void onDragStart(DragSource source, Object info, int dragAction) {
boolean isVisible = true;
boolean isUninstall = false;
// If we are dragging a widget from AppsCustomize, hide the delete target
if (isAllAppsWidget(source, info)) {
isVisible = false;
}
// If we are dragging an application from AppsCustomize, only show the control if we can
// delete the app (it was downloaded), and rename the string to "uninstall" in such a case
if (isAllAppsApplication(source, info)) {
ApplicationInfo appInfo = (ApplicationInfo) info;
if ((appInfo.flags & ApplicationInfo.DOWNLOADED_FLAG) != 0) {
isUninstall = true;
} else {
isVisible = false;
}
}
if (isUninstall) {
setCompoundDrawablesWithIntrinsicBounds(mUninstallDrawable, null, null, null);
} else {
setCompoundDrawablesWithIntrinsicBounds(mRemoveDrawable, null, null, null);
}
mCurrentDrawable = (TransitionDrawable) getCurrentDrawable();
mActive = isVisible;
resetHoverColor();
((ViewGroup) getParent()).setVisibility(isVisible ? View.VISIBLE : View.GONE);
if (getText().length() > 0) {
setText(isUninstall ? R.string.delete_target_uninstall_label
: R.string.delete_target_label);
}
}
@Override
public void onDragEnd() {
super.onDragEnd();
mActive = false;
}
public void onDragEnter(DragObject d) {
super.onDragEnter(d);
setHoverColor();
}
public void onDragExit(DragObject d) {
super.onDragExit(d);
if (!d.dragComplete) {
resetHoverColor();
} else {
// Restore the hover color if we are deleting
d.dragView.setColor(mHoverColor);
}
}
private void animateToTrashAndCompleteDrop(final DragObject d) {
DragLayer dragLayer = mLauncher.getDragLayer();
Rect from = new Rect();
dragLayer.getViewRectRelativeToSelf(d.dragView, from);
Rect to = getIconRect(d.dragView.getMeasuredWidth(), d.dragView.getMeasuredHeight(),
mCurrentDrawable.getIntrinsicWidth(), mCurrentDrawable.getIntrinsicHeight());
float scale = (float) to.width() / from.width();
mSearchDropTargetBar.deferOnDragEnd();
Runnable onAnimationEndRunnable = new Runnable() {
@Override
public void run() {
mSearchDropTargetBar.onDragEnd();
mLauncher.exitSpringLoadedDragMode();
completeDrop(d);
}
};
dragLayer.animateView(d.dragView, from, to, scale, 1f, 1f, 0.1f, 0.1f,
DELETE_ANIMATION_DURATION, new DecelerateInterpolator(2),
new LinearInterpolator(), onAnimationEndRunnable,
DragLayer.ANIMATION_END_DISAPPEAR, null);
}
private void completeDrop(DragObject d) {
ItemInfo item = (ItemInfo) d.dragInfo;
if (isAllAppsApplication(d.dragSource, item)) {
// Uninstall the application if it is being dragged from AppsCustomize
mLauncher.startApplicationUninstallActivity((ApplicationInfo) item);
} else if (isWorkspaceOrFolderApplication(d)) {
LauncherModel.deleteItemFromDatabase(mLauncher, item);
} else if (isWorkspaceFolder(d)) {
// Remove the folder from the workspace and delete the contents from launcher model
FolderInfo folderInfo = (FolderInfo) item;
mLauncher.removeFolder(folderInfo);
LauncherModel.deleteFolderContentsFromDatabase(mLauncher, folderInfo);
} else if (isWorkspaceOrFolderWidget(d)) {
// Remove the widget from the workspace
mLauncher.removeAppWidget((LauncherAppWidgetInfo) item);
LauncherModel.deleteItemFromDatabase(mLauncher, item);
final LauncherAppWidgetInfo launcherAppWidgetInfo = (LauncherAppWidgetInfo) item;
final LauncherAppWidgetHost appWidgetHost = mLauncher.getAppWidgetHost();
if (appWidgetHost != null) {
// Deleting an app widget ID is a void call but writes to disk before returning
// to the caller...
new Thread("deleteAppWidgetId") {
public void run() {
appWidgetHost.deleteAppWidgetId(launcherAppWidgetInfo.appWidgetId);
}
}.start();
}
}
}
public void onDrop(DragObject d) {
animateToTrashAndCompleteDrop(d);
}
/**
* Creates an animation from the current drag view to the delete trash icon.
*/
private AnimatorUpdateListener createFlingToTrashAnimatorListener(final DragLayer dragLayer,
DragObject d, PointF vel, ViewConfiguration config) {
final Rect to = getIconRect(d.dragView.getMeasuredWidth(), d.dragView.getMeasuredHeight(),
mCurrentDrawable.getIntrinsicWidth(), mCurrentDrawable.getIntrinsicHeight());
final Rect from = new Rect();
dragLayer.getViewRectRelativeToSelf(d.dragView, from);
// Calculate how far along the velocity vector we should put the intermediate point on
// the bezier curve
float velocity = Math.abs(vel.length());
float vp = Math.min(1f, velocity / (config.getScaledMaximumFlingVelocity() / 2f));
int offsetY = (int) (-from.top * vp);
int offsetX = (int) (offsetY / (vel.y / vel.x));
final float y2 = from.top + offsetY; // intermediate t/l
final float x2 = from.left + offsetX;
final float x1 = from.left; // drag view t/l
final float y1 = from.top;
final float x3 = to.left; // delete target t/l
final float y3 = to.top;
final TimeInterpolator scaleAlphaInterpolator = new TimeInterpolator() {
@Override
public float getInterpolation(float t) {
return t * t * t * t * t * t * t * t;
}
};
return new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
final DragView dragView = (DragView) dragLayer.getAnimatedView();
float t = ((Float) animation.getAnimatedValue()).floatValue();
float tp = scaleAlphaInterpolator.getInterpolation(t);
float initialScale = dragView.getInitialScale();
float finalAlpha = 0.5f;
float scale = dragView.getScaleX();
float x1o = ((1f - scale) * dragView.getMeasuredWidth()) / 2f;
float y1o = ((1f - scale) * dragView.getMeasuredHeight()) / 2f;
float x = (1f - t) * (1f - t) * (x1 - x1o) + 2 * (1f - t) * t * (x2 - x1o) +
(t * t) * x3;
float y = (1f - t) * (1f - t) * (y1 - y1o) + 2 * (1f - t) * t * (y2 - x1o) +
(t * t) * y3;
dragView.setTranslationX(x);
dragView.setTranslationY(y);
dragView.setScaleX(initialScale * (1f - tp));
dragView.setScaleY(initialScale * (1f - tp));
dragView.setAlpha(finalAlpha + (1f - finalAlpha) * (1f - tp));
}
};
}
/**
* Creates an animation from the current drag view along its current velocity vector.
* For this animation, the alpha runs for a fixed duration and we update the position
* progressively.
*/
private static class FlingAlongVectorAnimatorUpdateListener implements AnimatorUpdateListener {
private DragLayer mDragLayer;
private PointF mVelocity;
private Rect mFrom;
private long mPrevTime;
private boolean mHasOffsetForScale;
private float mFriction;
private final TimeInterpolator mAlphaInterpolator = new DecelerateInterpolator(0.75f);
public FlingAlongVectorAnimatorUpdateListener(DragLayer dragLayer, PointF vel, Rect from,
long startTime, float friction) {
mDragLayer = dragLayer;
mVelocity = vel;
mFrom = from;
mPrevTime = startTime;
mFriction = 1f - (dragLayer.getResources().getDisplayMetrics().density * friction);
}
@Override
public void onAnimationUpdate(ValueAnimator animation) {
final DragView dragView = (DragView) mDragLayer.getAnimatedView();
float t = ((Float) animation.getAnimatedValue()).floatValue();
long curTime = AnimationUtils.currentAnimationTimeMillis();
if (!mHasOffsetForScale) {
mHasOffsetForScale = true;
float scale = dragView.getScaleX();
float xOffset = ((scale - 1f) * dragView.getMeasuredWidth()) / 2f;
float yOffset = ((scale - 1f) * dragView.getMeasuredHeight()) / 2f;
mFrom.left += xOffset;
mFrom.top += yOffset;
}
mFrom.left += (mVelocity.x * (curTime - mPrevTime) / 1000f);
mFrom.top += (mVelocity.y * (curTime - mPrevTime) / 1000f);
dragView.setTranslationX(mFrom.left);
dragView.setTranslationY(mFrom.top);
dragView.setAlpha(1f - mAlphaInterpolator.getInterpolation(t));
mVelocity.x *= mFriction;
mVelocity.y *= mFriction;
mPrevTime = curTime;
}
};
private AnimatorUpdateListener createFlingAlongVectorAnimatorListener(final DragLayer dragLayer,
DragObject d, PointF vel, final long startTime, final int duration,
ViewConfiguration config) {
final Rect from = new Rect();
dragLayer.getViewRectRelativeToSelf(d.dragView, from);
return new FlingAlongVectorAnimatorUpdateListener(dragLayer, vel, from, startTime,
FLING_TO_DELETE_FRICTION);
}
public void onFlingToDelete(final DragObject d, int x, int y, PointF vel) {
final boolean isAllApps = d.dragSource instanceof AppsCustomizePagedView;
// Don't highlight the icon as it's animating
d.dragView.setColor(0);
d.dragView.updateInitialScaleToCurrentScale();
// Don't highlight the target if we are flinging from AllApps
if (isAllApps) {
resetHoverColor();
}
if (mFlingDeleteMode == MODE_FLING_DELETE_TO_TRASH) {
// Defer animating out the drop target if we are animating to it
mSearchDropTargetBar.deferOnDragEnd();
mSearchDropTargetBar.finishAnimations();
}
final ViewConfiguration config = ViewConfiguration.get(mLauncher);
final DragLayer dragLayer = mLauncher.getDragLayer();
final int duration = FLING_DELETE_ANIMATION_DURATION;
final long startTime = AnimationUtils.currentAnimationTimeMillis();
// NOTE: Because it takes time for the first frame of animation to actually be
// called and we expect the animation to be a continuation of the fling, we have
// to account for the time that has elapsed since the fling finished. And since
// we don't have a startDelay, we will always get call to update when we call
// start() (which we want to ignore).
final TimeInterpolator tInterpolator = new TimeInterpolator() {
private int mCount = -1;
private float mOffset = 0f;
@Override
public float getInterpolation(float t) {
if (mCount < 0) {
mCount++;
} else if (mCount == 0) {
mOffset = Math.min(0.5f, (float) (AnimationUtils.currentAnimationTimeMillis() -
startTime) / duration);
mCount++;
}
return Math.min(1f, mOffset + t);
}
};
AnimatorUpdateListener updateCb = null;
if (mFlingDeleteMode == MODE_FLING_DELETE_TO_TRASH) {
updateCb = createFlingToTrashAnimatorListener(dragLayer, d, vel, config);
} else if (mFlingDeleteMode == MODE_FLING_DELETE_ALONG_VECTOR) {
updateCb = createFlingAlongVectorAnimatorListener(dragLayer, d, vel, startTime,
duration, config);
}
Runnable onAnimationEndRunnable = new Runnable() {
@Override
public void run() {
mSearchDropTargetBar.onDragEnd();
// If we are dragging from AllApps, then we allow AppsCustomizePagedView to clean up
// itself, otherwise, complete the drop to initiate the deletion process
if (!isAllApps) {
mLauncher.exitSpringLoadedDragMode();
completeDrop(d);
}
mLauncher.getDragController().onDeferredEndFling(d);
}
};
dragLayer.animateView(d.dragView, updateCb, duration, tInterpolator, onAnimationEndRunnable,
DragLayer.ANIMATION_END_DISAPPEAR, null);
}
}