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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.launcher3;
     18 
     19 import android.content.Context;
     20 import android.graphics.Bitmap;
     21 import android.graphics.Canvas;
     22 import android.graphics.Region;
     23 import android.graphics.Region.Op;
     24 import android.util.AttributeSet;
     25 import android.util.TypedValue;
     26 import android.widget.TextView;
     27 
     28 /**
     29  * An icon on a PagedView, specifically for items in the launcher's paged view (with compound
     30  * drawables on the top).
     31  */
     32 public class PagedViewIcon extends TextView {
     33     /** A simple callback interface to allow a PagedViewIcon to notify when it has been pressed */
     34     public static interface PressedCallback {
     35         void iconPressed(PagedViewIcon icon);
     36     }
     37 
     38     @SuppressWarnings("unused")
     39     private static final String TAG = "PagedViewIcon";
     40     private static final float PRESS_ALPHA = 0.4f;
     41 
     42     private PagedViewIcon.PressedCallback mPressedCallback;
     43     private boolean mLockDrawableState = false;
     44 
     45     private Bitmap mIcon;
     46 
     47     public PagedViewIcon(Context context) {
     48         this(context, null);
     49     }
     50 
     51     public PagedViewIcon(Context context, AttributeSet attrs) {
     52         this(context, attrs, 0);
     53     }
     54 
     55     public PagedViewIcon(Context context, AttributeSet attrs, int defStyle) {
     56         super(context, attrs, defStyle);
     57     }
     58 
     59     public void onFinishInflate() {
     60         super.onFinishInflate();
     61 
     62         // Ensure we are using the right text size
     63         LauncherAppState app = LauncherAppState.getInstance();
     64         DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
     65         setTextSize(TypedValue.COMPLEX_UNIT_SP, grid.iconTextSize);
     66     }
     67 
     68     public void applyFromApplicationInfo(AppInfo info, boolean scaleUp,
     69             PagedViewIcon.PressedCallback cb) {
     70         mIcon = info.iconBitmap;
     71         mPressedCallback = cb;
     72         setCompoundDrawables(null, Utilities.createIconDrawable(mIcon),
     73                 null, null);
     74         setText(info.title);
     75         setTag(info);
     76     }
     77 
     78     public void lockDrawableState() {
     79         mLockDrawableState = true;
     80     }
     81 
     82     public void resetDrawableState() {
     83         mLockDrawableState = false;
     84         post(new Runnable() {
     85             @Override
     86             public void run() {
     87                 refreshDrawableState();
     88             }
     89         });
     90     }
     91 
     92     protected void drawableStateChanged() {
     93         super.drawableStateChanged();
     94 
     95         // We keep in the pressed state until resetDrawableState() is called to reset the press
     96         // feedback
     97         if (isPressed()) {
     98             setAlpha(PRESS_ALPHA);
     99             if (mPressedCallback != null) {
    100                 mPressedCallback.iconPressed(this);
    101             }
    102         } else if (!mLockDrawableState) {
    103             setAlpha(1f);
    104         }
    105     }
    106 
    107     @Override
    108     public void draw(Canvas canvas) {
    109         // If text is transparent, don't draw any shadow
    110         if (getCurrentTextColor() == getResources().getColor(android.R.color.transparent)) {
    111             getPaint().clearShadowLayer();
    112             super.draw(canvas);
    113             return;
    114         }
    115 
    116         // We enhance the shadow by drawing the shadow twice
    117         getPaint().setShadowLayer(BubbleTextView.SHADOW_LARGE_RADIUS, 0.0f,
    118                 BubbleTextView.SHADOW_Y_OFFSET, BubbleTextView.SHADOW_LARGE_COLOUR);
    119         super.draw(canvas);
    120         canvas.save(Canvas.CLIP_SAVE_FLAG);
    121         canvas.clipRect(getScrollX(), getScrollY() + getExtendedPaddingTop(),
    122                 getScrollX() + getWidth(),
    123                 getScrollY() + getHeight(), Region.Op.INTERSECT);
    124         getPaint().setShadowLayer(BubbleTextView.SHADOW_SMALL_RADIUS, 0.0f, 0.0f,
    125                 BubbleTextView.SHADOW_SMALL_COLOUR);
    126         super.draw(canvas);
    127         canvas.restore();
    128     }
    129 }
    130