src/com/android/launcher3/ButtonDropTarget.java - platform/packages/apps/Launcher3 - Git at Google

 /*
  * Copyright (C) 2010 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 static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;

 import static com.android.launcher3.LauncherState.NORMAL;

 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.PopupWindow;
 import android.widget.TextView;

 import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.dragndrop.DragController;
 import com.android.launcher3.dragndrop.DragLayer;
 import com.android.launcher3.dragndrop.DragOptions;
 import com.android.launcher3.dragndrop.DragView;
 import com.android.launcher3.model.data.ItemInfo;

 /**
  * Implements a DropTarget.
  */
 public abstract class ButtonDropTarget extends TextView
         implements DropTarget, DragController.DragListener, OnClickListener {

     private static final int[] sTempCords = new int[2];
     private static final int DRAG_VIEW_DROP_DURATION = 285;
     private static final float DRAG_VIEW_HOVER_OVER_OPACITY = 0.65f;

     public static final int TOOLTIP_DEFAULT = 0;
     public static final int TOOLTIP_LEFT = 1;
     public static final int TOOLTIP_RIGHT = 2;

     protected final Launcher mLauncher;

     protected DropTargetBar mDropTargetBar;

     /** Whether this drop target is active for the current drag */
     protected boolean mActive;
     /** Whether an accessible drag is in progress */
     private boolean mAccessibleDrag;
     /** An item must be dragged at least this many pixels before this drop target is enabled. */
     private final int mDragDistanceThreshold;
     /** The size of the drawable shown in the drop target. */
     private final int mDrawableSize;
     /** The padding, in pixels, between the text and drawable. */
     private final int mDrawablePadding;

     protected CharSequence mText;
     protected Drawable mDrawable;
     private boolean mTextVisible = true;

     private PopupWindow mToolTip;
     private int mToolTipLocation;

     public ButtonDropTarget(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
     }

     public ButtonDropTarget(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
         mLauncher = Launcher.getLauncher(context);

         Resources resources = getResources();
         mDragDistanceThreshold = resources.getDimensionPixelSize(R.dimen.drag_distanceThreshold);
         mDrawableSize = resources.getDimensionPixelSize(R.dimen.drop_target_text_size);
         mDrawablePadding = resources.getDimensionPixelSize(
                 R.dimen.drop_target_button_drawable_padding);
     }

     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
         mText = getText();
         setContentDescription(mText);
     }

     protected void updateText(int resId) {
         setText(resId);
         mText = getText();
         setContentDescription(mText);
     }

     protected void setDrawable(int resId) {
         // We do not set the drawable in the xml as that inflates two drawables corresponding to
         // drawableLeft and drawableStart.
         mDrawable = getContext().getDrawable(resId).mutate();
         mDrawable.setTintList(getTextColors());
         centerIcon();
         setCompoundDrawablesRelative(mDrawable, null, null, null);
     }

     public void setDropTargetBar(DropTargetBar dropTargetBar) {
         mDropTargetBar = dropTargetBar;
     }

     private void hideTooltip() {
         if (mToolTip != null) {
             mToolTip.dismiss();
             mToolTip = null;
         }
     }

     @Override
     public final void onDragEnter(DragObject d) {
         if (!mAccessibleDrag && !mTextVisible) {
             // Show tooltip
             hideTooltip();

             TextView message = (TextView) LayoutInflater.from(getContext()).inflate(
                     R.layout.drop_target_tool_tip, null);
             message.setText(mText);

             mToolTip = new PopupWindow(message, WRAP_CONTENT, WRAP_CONTENT);
             int x = 0, y = 0;
             if (mToolTipLocation != TOOLTIP_DEFAULT) {
                 y = -getMeasuredHeight();
                 message.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
                 if (mToolTipLocation == TOOLTIP_LEFT) {
                     x = - getMeasuredWidth() - message.getMeasuredWidth() / 2;
                 } else {
                     x = getMeasuredWidth() / 2 + message.getMeasuredWidth() / 2;
                 }
             }
             mToolTip.showAsDropDown(this, x, y);
         }

         d.dragView.setAlpha(DRAG_VIEW_HOVER_OVER_OPACITY);
         setSelected(true);
         if (d.stateAnnouncer != null) {
             d.stateAnnouncer.cancel();
         }
         sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
     }

     @Override
     public void onDragOver(DragObject d) {
         // Do nothing
     }

     @Override
     public final void onDragExit(DragObject d) {
         hideTooltip();

         if (!d.dragComplete) {
             d.dragView.setAlpha(1f);
             setSelected(false);
         } else {
             d.dragView.setAlpha(DRAG_VIEW_HOVER_OVER_OPACITY);
         }
     }

     @Override
     public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
         mActive = !options.isKeyboardDrag && supportsDrop(dragObject.dragInfo);
         setVisibility(mActive ? View.VISIBLE : View.GONE);

         mAccessibleDrag = options.isAccessibleDrag;
         setOnClickListener(mAccessibleDrag ? this : null);
     }

     @Override
     public final boolean acceptDrop(DragObject dragObject) {
         return supportsDrop(dragObject.dragInfo);
     }

     protected abstract boolean supportsDrop(ItemInfo info);

     public abstract boolean supportsAccessibilityDrop(ItemInfo info, View view);

     @Override
     public boolean isDropEnabled() {
         return mActive && (mAccessibleDrag ||
                 mLauncher.getDragController().getDistanceDragged() >= mDragDistanceThreshold);
     }

     @Override
     public void onDragEnd() {
         mActive = false;
         setOnClickListener(null);
         setSelected(false);
     }

     /**
      * On drop animate the dropView to the icon.
      */
     @Override
     public void onDrop(final DragObject d, final DragOptions options) {
         if (options.isFlingToDelete) {
             // FlingAnimation handles the animation and then calls completeDrop().
             return;
         }
         final DragLayer dragLayer = mLauncher.getDragLayer();
         final DragView dragView = d.dragView;
         final Rect to = getIconRect(d);
         final float scale = (float) to.width() / dragView.getMeasuredWidth();
         dragView.detachContentView(/* reattachToPreviousParent= */ true);
         mDropTargetBar.deferOnDragEnd();

         Runnable onAnimationEndRunnable = () -> {
             completeDrop(d);
             mDropTargetBar.onDragEnd();
             mLauncher.getStateManager().goToState(NORMAL);
         };

         dragLayer.animateView(d.dragView, to, scale, 0.1f, 0.1f,
                 DRAG_VIEW_DROP_DURATION,
                 Interpolators.DEACCEL_2, onAnimationEndRunnable,
                 DragLayer.ANIMATION_END_DISAPPEAR, null);
     }

     public abstract int getAccessibilityAction();

     @Override
     public void prepareAccessibilityDrop() { }

     public abstract void onAccessibilityDrop(View view, ItemInfo item);

     public abstract void completeDrop(DragObject d);

     @Override
     public void getHitRectRelativeToDragLayer(android.graphics.Rect outRect) {
         super.getHitRect(outRect);
         outRect.bottom += mLauncher.getDeviceProfile().dropTargetDragPaddingPx;

         sTempCords[0] = sTempCords[1] = 0;
         mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, sTempCords);
         outRect.offsetTo(sTempCords[0], sTempCords[1]);
     }

     public Rect getIconRect(DragObject dragObject) {
         int viewWidth = dragObject.dragView.getMeasuredWidth();
         int viewHeight = dragObject.dragView.getMeasuredHeight();
         int drawableWidth = mDrawable.getIntrinsicWidth();
         int drawableHeight = mDrawable.getIntrinsicHeight();
         DragLayer dragLayer = mLauncher.getDragLayer();

         // Find the rect to animate to (the view is center aligned)
         Rect to = new Rect();
         dragLayer.getViewRectRelativeToSelf(this, to);

         final int width = drawableWidth;
         final int height = drawableHeight;

         final int left;
         final int right;

         if (Utilities.isRtl(getResources())) {
             right = to.right - getPaddingRight();
             left = right - width;
         } else {
             left = to.left + getPaddingLeft();
             right = left + width;
         }

         final int top = to.top + (getMeasuredHeight() - height) / 2;
         final int bottom = top + height;

         to.set(left, top, right, bottom);

         // Center the destination rect about the trash icon
         final int xOffset = -(viewWidth - width) / 2;
         final int yOffset = -(viewHeight - height) / 2;
         to.offset(xOffset, yOffset);

         return to;
     }

     private void centerIcon() {
         int x = mTextVisible ? 0
                 : (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 - mDrawableSize / 2;
         mDrawable.setBounds(x, 0, x + mDrawableSize, mDrawableSize);
     }

     @Override
     public void onClick(View v) {
         mLauncher.getAccessibilityDelegate().handleAccessibleDrop(this, null, null);
     }

     public void setTextVisible(boolean isVisible) {
         CharSequence newText = isVisible ? mText : "";
         if (mTextVisible != isVisible || !TextUtils.equals(newText, getText())) {
             mTextVisible = isVisible;
             setText(newText);
             centerIcon();
             setCompoundDrawablesRelative(mDrawable, null, null, null);
             int drawablePadding = mTextVisible ? mDrawablePadding : 0;
             setCompoundDrawablePadding(drawablePadding);
         }
     }

     @Override
     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
         super.onSizeChanged(w, h, oldw, oldh);
         centerIcon();
     }

     public void setToolTipLocation(int location) {
         mToolTipLocation = location;
         hideTooltip();
     }

     public boolean isTextTruncated(int availableWidth) {
         availableWidth -= (getPaddingLeft() + getPaddingRight() + mDrawable.getIntrinsicWidth()
                 + getCompoundDrawablePadding());
         CharSequence displayedText = TextUtils.ellipsize(mText, getPaint(), availableWidth,
                 TextUtils.TruncateAt.END);
         return !mText.equals(displayedText);
     }
 }
	/*
	* Copyright (C) 2010 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 static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;

	import static com.android.launcher3.LauncherState.NORMAL;

	import android.content.Context;
	import android.content.res.Resources;
	import android.graphics.Rect;
	import android.graphics.drawable.Drawable;
	import android.text.TextUtils;
	import android.util.AttributeSet;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.view.accessibility.AccessibilityEvent;
	import android.widget.PopupWindow;
	import android.widget.TextView;

	import com.android.launcher3.anim.Interpolators;
	import com.android.launcher3.dragndrop.DragController;
	import com.android.launcher3.dragndrop.DragLayer;
	import com.android.launcher3.dragndrop.DragOptions;
	import com.android.launcher3.dragndrop.DragView;
	import com.android.launcher3.model.data.ItemInfo;

	/**
	* Implements a DropTarget.
	*/
	public abstract class ButtonDropTarget extends TextView
	implements DropTarget, DragController.DragListener, OnClickListener {

	private static final int[] sTempCords = new int[2];
	private static final int DRAG_VIEW_DROP_DURATION = 285;
	private static final float DRAG_VIEW_HOVER_OVER_OPACITY = 0.65f;

	public static final int TOOLTIP_DEFAULT = 0;
	public static final int TOOLTIP_LEFT = 1;
	public static final int TOOLTIP_RIGHT = 2;

	protected final Launcher mLauncher;

	protected DropTargetBar mDropTargetBar;

	/** Whether this drop target is active for the current drag */
	protected boolean mActive;
	/** Whether an accessible drag is in progress */
	private boolean mAccessibleDrag;
	/** An item must be dragged at least this many pixels before this drop target is enabled. */
	private final int mDragDistanceThreshold;
	/** The size of the drawable shown in the drop target. */
	private final int mDrawableSize;
	/** The padding, in pixels, between the text and drawable. */
	private final int mDrawablePadding;

	protected CharSequence mText;
	protected Drawable mDrawable;
	private boolean mTextVisible = true;

	private PopupWindow mToolTip;
	private int mToolTipLocation;

	public ButtonDropTarget(Context context, AttributeSet attrs) {
	this(context, attrs, 0);
	}

	public ButtonDropTarget(Context context, AttributeSet attrs, int defStyle) {
	super(context, attrs, defStyle);
	mLauncher = Launcher.getLauncher(context);

	Resources resources = getResources();
	mDragDistanceThreshold = resources.getDimensionPixelSize(R.dimen.drag_distanceThreshold);
	mDrawableSize = resources.getDimensionPixelSize(R.dimen.drop_target_text_size);
	mDrawablePadding = resources.getDimensionPixelSize(
	R.dimen.drop_target_button_drawable_padding);
	}

	@Override
	protected void onFinishInflate() {
	super.onFinishInflate();
	mText = getText();
	setContentDescription(mText);
	}

	protected void updateText(int resId) {
	setText(resId);
	mText = getText();
	setContentDescription(mText);
	}

	protected void setDrawable(int resId) {
	// We do not set the drawable in the xml as that inflates two drawables corresponding to
	// drawableLeft and drawableStart.
	mDrawable = getContext().getDrawable(resId).mutate();
	mDrawable.setTintList(getTextColors());
	centerIcon();
	setCompoundDrawablesRelative(mDrawable, null, null, null);
	}

	public void setDropTargetBar(DropTargetBar dropTargetBar) {
	mDropTargetBar = dropTargetBar;
	}

	private void hideTooltip() {
	if (mToolTip != null) {
	mToolTip.dismiss();
	mToolTip = null;
	}
	}

	@Override
	public final void onDragEnter(DragObject d) {
	if (!mAccessibleDrag && !mTextVisible) {
	// Show tooltip
	hideTooltip();

	TextView message = (TextView) LayoutInflater.from(getContext()).inflate(
	R.layout.drop_target_tool_tip, null);
	message.setText(mText);

	mToolTip = new PopupWindow(message, WRAP_CONTENT, WRAP_CONTENT);
	int x = 0, y = 0;
	if (mToolTipLocation != TOOLTIP_DEFAULT) {
	y = -getMeasuredHeight();
	message.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
	if (mToolTipLocation == TOOLTIP_LEFT) {
	x = - getMeasuredWidth() - message.getMeasuredWidth() / 2;
	} else {
	x = getMeasuredWidth() / 2 + message.getMeasuredWidth() / 2;
	}
	}
	mToolTip.showAsDropDown(this, x, y);
	}

	d.dragView.setAlpha(DRAG_VIEW_HOVER_OVER_OPACITY);
	setSelected(true);
	if (d.stateAnnouncer != null) {
	d.stateAnnouncer.cancel();
	}
	sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
	}

	@Override
	public void onDragOver(DragObject d) {
	// Do nothing
	}

	@Override
	public final void onDragExit(DragObject d) {
	hideTooltip();

	if (!d.dragComplete) {
	d.dragView.setAlpha(1f);
	setSelected(false);
	} else {
	d.dragView.setAlpha(DRAG_VIEW_HOVER_OVER_OPACITY);
	}
	}

	@Override
	public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
	mActive = !options.isKeyboardDrag && supportsDrop(dragObject.dragInfo);
	setVisibility(mActive ? View.VISIBLE : View.GONE);

	mAccessibleDrag = options.isAccessibleDrag;
	setOnClickListener(mAccessibleDrag ? this : null);
	}

	@Override
	public final boolean acceptDrop(DragObject dragObject) {
	return supportsDrop(dragObject.dragInfo);
	}

	protected abstract boolean supportsDrop(ItemInfo info);

	public abstract boolean supportsAccessibilityDrop(ItemInfo info, View view);

	@Override
	public boolean isDropEnabled() {
	return mActive && (mAccessibleDrag \|\|
	mLauncher.getDragController().getDistanceDragged() >= mDragDistanceThreshold);
	}

	@Override
	public void onDragEnd() {
	mActive = false;
	setOnClickListener(null);
	setSelected(false);
	}

	/**
	* On drop animate the dropView to the icon.
	*/
	@Override
	public void onDrop(final DragObject d, final DragOptions options) {
	if (options.isFlingToDelete) {
	// FlingAnimation handles the animation and then calls completeDrop().
	return;
	}
	final DragLayer dragLayer = mLauncher.getDragLayer();
	final DragView dragView = d.dragView;
	final Rect to = getIconRect(d);
	final float scale = (float) to.width() / dragView.getMeasuredWidth();
	dragView.detachContentView(/* reattachToPreviousParent= */ true);
	mDropTargetBar.deferOnDragEnd();

	Runnable onAnimationEndRunnable = () -> {
	completeDrop(d);
	mDropTargetBar.onDragEnd();
	mLauncher.getStateManager().goToState(NORMAL);
	};

	dragLayer.animateView(d.dragView, to, scale, 0.1f, 0.1f,
	DRAG_VIEW_DROP_DURATION,
	Interpolators.DEACCEL_2, onAnimationEndRunnable,
	DragLayer.ANIMATION_END_DISAPPEAR, null);
	}

	public abstract int getAccessibilityAction();

	@Override
	public void prepareAccessibilityDrop() { }

	public abstract void onAccessibilityDrop(View view, ItemInfo item);

	public abstract void completeDrop(DragObject d);

	@Override
	public void getHitRectRelativeToDragLayer(android.graphics.Rect outRect) {
	super.getHitRect(outRect);
	outRect.bottom += mLauncher.getDeviceProfile().dropTargetDragPaddingPx;

	sTempCords[0] = sTempCords[1] = 0;
	mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, sTempCords);
	outRect.offsetTo(sTempCords[0], sTempCords[1]);
	}

	public Rect getIconRect(DragObject dragObject) {
	int viewWidth = dragObject.dragView.getMeasuredWidth();
	int viewHeight = dragObject.dragView.getMeasuredHeight();
	int drawableWidth = mDrawable.getIntrinsicWidth();
	int drawableHeight = mDrawable.getIntrinsicHeight();
	DragLayer dragLayer = mLauncher.getDragLayer();

	// Find the rect to animate to (the view is center aligned)
	Rect to = new Rect();
	dragLayer.getViewRectRelativeToSelf(this, to);

	final int width = drawableWidth;
	final int height = drawableHeight;

	final int left;
	final int right;

	if (Utilities.isRtl(getResources())) {
	right = to.right - getPaddingRight();
	left = right - width;
	} else {
	left = to.left + getPaddingLeft();
	right = left + width;
	}

	final int top = to.top + (getMeasuredHeight() - height) / 2;
	final int bottom = top + height;

	to.set(left, top, right, bottom);

	// Center the destination rect about the trash icon
	final int xOffset = -(viewWidth - width) / 2;
	final int yOffset = -(viewHeight - height) / 2;
	to.offset(xOffset, yOffset);

	return to;
	}

	private void centerIcon() {
	int x = mTextVisible ? 0
	: (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 - mDrawableSize / 2;
	mDrawable.setBounds(x, 0, x + mDrawableSize, mDrawableSize);
	}

	@Override
	public void onClick(View v) {
	mLauncher.getAccessibilityDelegate().handleAccessibleDrop(this, null, null);
	}

	public void setTextVisible(boolean isVisible) {
	CharSequence newText = isVisible ? mText : "";
	if (mTextVisible != isVisible \|\| !TextUtils.equals(newText, getText())) {
	mTextVisible = isVisible;
	setText(newText);
	centerIcon();
	setCompoundDrawablesRelative(mDrawable, null, null, null);
	int drawablePadding = mTextVisible ? mDrawablePadding : 0;
	setCompoundDrawablePadding(drawablePadding);
	}
	}

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
	super.onSizeChanged(w, h, oldw, oldh);
	centerIcon();
	}

	public void setToolTipLocation(int location) {
	mToolTipLocation = location;
	hideTooltip();
	}

	public boolean isTextTruncated(int availableWidth) {
	availableWidth -= (getPaddingLeft() + getPaddingRight() + mDrawable.getIntrinsicWidth()
	+ getCompoundDrawablePadding());
	CharSequence displayedText = TextUtils.ellipsize(mText, getPaint(), availableWidth,
	TextUtils.TruncateAt.END);
	return !mText.equals(displayedText);
	}
	}