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/*
* 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.launcher2;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.Region;
import android.graphics.Region.Op;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.TextView;
/**
* TextView that draws a bubble behind the text. We cannot use a LineBackgroundSpan
* because we want to make the bubble taller than the text and TextView's clip is
* too aggressive.
*/
public class BubbleTextView extends TextView {
static final float CORNER_RADIUS = 4.0f;
static final float SHADOW_LARGE_RADIUS = 4.0f;
static final float SHADOW_SMALL_RADIUS = 1.75f;
static final float SHADOW_Y_OFFSET = 2.0f;
static final int SHADOW_LARGE_COLOUR = 0xDD000000;
static final int SHADOW_SMALL_COLOUR = 0xCC000000;
static final float PADDING_H = 8.0f;
static final float PADDING_V = 3.0f;
private int mPrevAlpha = -1;
private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper();
private final Canvas mTempCanvas = new Canvas();
private final Rect mTempRect = new Rect();
private boolean mDidInvalidateForPressedState;
private Bitmap mPressedOrFocusedBackground;
private int mFocusedOutlineColor;
private int mFocusedGlowColor;
private int mPressedOutlineColor;
private int mPressedGlowColor;
private boolean mBackgroundSizeChanged;
private Drawable mBackground;
private boolean mStayPressed;
private CheckLongPressHelper mLongPressHelper;
public BubbleTextView(Context context) {
super(context);
init();
}
public BubbleTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public BubbleTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
mLongPressHelper = new CheckLongPressHelper(this);
mBackground = getBackground();
final Resources res = getContext().getResources();
mFocusedOutlineColor = mFocusedGlowColor = mPressedOutlineColor = mPressedGlowColor =
res.getColor(android.R.color.holo_blue_light);
setShadowLayer(SHADOW_LARGE_RADIUS, 0.0f, SHADOW_Y_OFFSET, SHADOW_LARGE_COLOUR);
}
public void applyFromShortcutInfo(ShortcutInfo info, IconCache iconCache) {
Bitmap b = info.getIcon(iconCache);
setCompoundDrawablesWithIntrinsicBounds(null,
new FastBitmapDrawable(b),
null, null);
setText(info.title);
setTag(info);
}
@Override
protected boolean setFrame(int left, int top, int right, int bottom) {
if (getLeft() != left || getRight() != right || getTop() != top || getBottom() != bottom) {
mBackgroundSizeChanged = true;
}
return super.setFrame(left, top, right, bottom);
}
@Override
protected boolean verifyDrawable(Drawable who) {
return who == mBackground || super.verifyDrawable(who);
}
@Override
public void setTag(Object tag) {
if (tag != null) {
LauncherModel.checkItemInfo((ItemInfo) tag);
}
super.setTag(tag);
}
@Override
protected void drawableStateChanged() {
if (isPressed()) {
// In this case, we have already created the pressed outline on ACTION_DOWN,
// so we just need to do an invalidate to trigger draw
if (!mDidInvalidateForPressedState) {
setCellLayoutPressedOrFocusedIcon();
}
} else {
// Otherwise, either clear the pressed/focused background, or create a background
// for the focused state
final boolean backgroundEmptyBefore = mPressedOrFocusedBackground == null;
if (!mStayPressed) {
mPressedOrFocusedBackground = null;
}
if (isFocused()) {
if (getLayout() == null) {
// In some cases, we get focus before we have been layed out. Set the
// background to null so that it will get created when the view is drawn.
mPressedOrFocusedBackground = null;
} else {
mPressedOrFocusedBackground = createGlowingOutline(
mTempCanvas, mFocusedGlowColor, mFocusedOutlineColor);
}
mStayPressed = false;
setCellLayoutPressedOrFocusedIcon();
}
final boolean backgroundEmptyNow = mPressedOrFocusedBackground == null;
if (!backgroundEmptyBefore && backgroundEmptyNow) {
setCellLayoutPressedOrFocusedIcon();
}
}
Drawable d = mBackground;
if (d != null && d.isStateful()) {
d.setState(getDrawableState());
}
super.drawableStateChanged();
}
/**
* Draw this BubbleTextView into the given Canvas.
*
* @param destCanvas the canvas to draw on
* @param padding the horizontal and vertical padding to use when drawing
*/
private void drawWithPadding(Canvas destCanvas, int padding) {
final Rect clipRect = mTempRect;
getDrawingRect(clipRect);
// adjust the clip rect so that we don't include the text label
clipRect.bottom =
getExtendedPaddingTop() - (int) BubbleTextView.PADDING_V + getLayout().getLineTop(0);
// Draw the View into the bitmap.
// The translate of scrollX and scrollY is necessary when drawing TextViews, because
// they set scrollX and scrollY to large values to achieve centered text
destCanvas.save();
destCanvas.scale(getScaleX(), getScaleY(),
(getWidth() + padding) / 2, (getHeight() + padding) / 2);
destCanvas.translate(-getScrollX() + padding / 2, -getScrollY() + padding / 2);
destCanvas.clipRect(clipRect, Op.REPLACE);
draw(destCanvas);
destCanvas.restore();
}
/**
* Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
* Responsibility for the bitmap is transferred to the caller.
*/
private Bitmap createGlowingOutline(Canvas canvas, int outlineColor, int glowColor) {
final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
final Bitmap b = Bitmap.createBitmap(
getWidth() + padding, getHeight() + padding, Bitmap.Config.ARGB_8888);
canvas.setBitmap(b);
drawWithPadding(canvas, padding);
mOutlineHelper.applyExtraThickExpensiveOutlineWithBlur(b, canvas, glowColor, outlineColor);
canvas.setBitmap(null);
return b;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// Call the superclass onTouchEvent first, because sometimes it changes the state to
// isPressed() on an ACTION_UP
boolean result = super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// So that the pressed outline is visible immediately when isPressed() is true,
// we pre-create it on ACTION_DOWN (it takes a small but perceptible amount of time
// to create it)
if (mPressedOrFocusedBackground == null) {
mPressedOrFocusedBackground = createGlowingOutline(
mTempCanvas, mPressedGlowColor, mPressedOutlineColor);
}
// Invalidate so the pressed state is visible, or set a flag so we know that we
// have to call invalidate as soon as the state is "pressed"
if (isPressed()) {
mDidInvalidateForPressedState = true;
setCellLayoutPressedOrFocusedIcon();
} else {
mDidInvalidateForPressedState = false;
}
mLongPressHelper.postCheckForLongPress();
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
// If we've touched down and up on an item, and it's still not "pressed", then
// destroy the pressed outline
if (!isPressed()) {
mPressedOrFocusedBackground = null;
}
mLongPressHelper.cancelLongPress();
break;
}
return result;
}
void setStayPressed(boolean stayPressed) {
mStayPressed = stayPressed;
if (!stayPressed) {
mPressedOrFocusedBackground = null;
}
setCellLayoutPressedOrFocusedIcon();
}
void setCellLayoutPressedOrFocusedIcon() {
if (getParent() instanceof ShortcutAndWidgetContainer) {
ShortcutAndWidgetContainer parent = (ShortcutAndWidgetContainer) getParent();
if (parent != null) {
CellLayout layout = (CellLayout) parent.getParent();
layout.setPressedOrFocusedIcon((mPressedOrFocusedBackground != null) ? this : null);
}
}
}
void clearPressedOrFocusedBackground() {
mPressedOrFocusedBackground = null;
setCellLayoutPressedOrFocusedIcon();
}
Bitmap getPressedOrFocusedBackground() {
return mPressedOrFocusedBackground;
}
int getPressedOrFocusedBackgroundPadding() {
return HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS / 2;
}
@Override
public void draw(Canvas canvas) {
final Drawable background = mBackground;
if (background != null) {
final int scrollX = getScrollX();
final int scrollY = getScrollY();
if (mBackgroundSizeChanged) {
background.setBounds(0, 0, getRight() - getLeft(), getBottom() - getTop());
mBackgroundSizeChanged = false;
}
if ((scrollX | scrollY) == 0) {
background.draw(canvas);
} else {
canvas.translate(scrollX, scrollY);
background.draw(canvas);
canvas.translate(-scrollX, -scrollY);
}
}
// If text is transparent, don't draw any shadow
if (getCurrentTextColor() == getResources().getColor(android.R.color.transparent)) {
getPaint().clearShadowLayer();
super.draw(canvas);
return;
}
// We enhance the shadow by drawing the shadow twice
getPaint().setShadowLayer(SHADOW_LARGE_RADIUS, 0.0f, SHADOW_Y_OFFSET, SHADOW_LARGE_COLOUR);
super.draw(canvas);
canvas.save(Canvas.CLIP_SAVE_FLAG);
canvas.clipRect(getScrollX(), getScrollY() + getExtendedPaddingTop(),
getScrollX() + getWidth(),
getScrollY() + getHeight(), Region.Op.INTERSECT);
getPaint().setShadowLayer(SHADOW_SMALL_RADIUS, 0.0f, 0.0f, SHADOW_SMALL_COLOUR);
super.draw(canvas);
canvas.restore();
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (mBackground != null) mBackground.setCallback(this);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (mBackground != null) mBackground.setCallback(null);
}
@Override
protected boolean onSetAlpha(int alpha) {
if (mPrevAlpha != alpha) {
mPrevAlpha = alpha;
super.onSetAlpha(alpha);
}
return true;
}
@Override
public void cancelLongPress() {
super.cancelLongPress();
mLongPressHelper.cancelLongPress();
}
}