Redo the look of the recent apps switcher.

Change-Id: Icb523e2f5949c2b502aa8003aa14b7ac98a616f2

3 files changed, 387 insertions, 46 deletions

diff --git a/policy/com/android/internal/policy/impl/IconUtilities.java b/policy/com/android/internal/policy/impl/IconUtilities.java
new file mode 100644
index 0000000..99055cf
--- /dev/null
+++ b/policy/com/android/internal/policy/impl/IconUtilities.java
@@ -0,0 +1,192 @@
+/*
+ * 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.internal.policy.impl;
+
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.PaintDrawable;
+import android.graphics.drawable.StateListDrawable;
+import android.graphics.Bitmap;
+import android.graphics.BlurMaskFilter;
+import android.graphics.Canvas;
+import android.graphics.ColorMatrix;
+import android.graphics.ColorMatrixColorFilter;
+import android.graphics.Paint;
+import android.graphics.PaintFlagsDrawFilter;
+import android.graphics.PixelFormat;
+import android.graphics.PorterDuff;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.TableMaskFilter;
+import android.graphics.Typeface;
+import android.text.Layout.Alignment;
+import android.text.StaticLayout;
+import android.text.TextPaint;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.content.res.Resources;
+import android.content.Context;
+
+/**
+ * Various utilities shared amongst the Launcher's classes.
+ */
+final class IconUtilities {
+    private static final String TAG = "IconUtilities";
+
+    private static final int sColors[] = { 0xffff0000, 0xff00ff00, 0xff0000ff };
+
+    private int mIconWidth = -1;
+    private int mIconHeight = -1;
+    private int mIconTextureWidth = -1;
+    private int mIconTextureHeight = -1;
+
+    private final Paint mPaint = new Paint();
+    private final Paint mBlurPaint = new Paint();
+    private final Paint mGlowColorPressedPaint = new Paint();
+    private final Paint mGlowColorFocusedPaint = new Paint();
+    private final Rect mOldBounds = new Rect();
+    private final Canvas mCanvas = new Canvas();
+    private final DisplayMetrics mDisplayMetrics;
+
+    private int mColorIndex = 0;
+
+    public IconUtilities(Context context) {
+        final Resources resources = context.getResources();
+        DisplayMetrics metrics = mDisplayMetrics = resources.getDisplayMetrics();
+        final float density = metrics.density;
+        final float blurPx = 5 * density;
+
+        mIconWidth = mIconHeight = (int) resources.getDimension(android.R.dimen.app_icon_size);
+        mIconTextureWidth = mIconTextureHeight = mIconWidth + (int)(blurPx*2);
+
+        mBlurPaint.setMaskFilter(new BlurMaskFilter(blurPx, BlurMaskFilter.Blur.NORMAL));
+        mGlowColorPressedPaint.setColor(0xffffc300);
+        mGlowColorPressedPaint.setMaskFilter(TableMaskFilter.CreateClipTable(0, 30));
+        mGlowColorFocusedPaint.setColor(0xffff8e00);
+        mGlowColorFocusedPaint.setMaskFilter(TableMaskFilter.CreateClipTable(0, 30));
+
+        ColorMatrix cm = new ColorMatrix();
+        cm.setSaturation(0.2f);
+
+        mCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
+                Paint.FILTER_BITMAP_FLAG));
+    }
+
+    public Drawable createIconDrawable(Drawable src) {
+        Bitmap scaled = createIconBitmap(src);
+
+        StateListDrawable result = new StateListDrawable();
+
+        result.addState(new int[] { android.R.attr.state_focused },
+                new BitmapDrawable(createSelectedBitmap(scaled, false)));
+        result.addState(new int[] { android.R.attr.state_pressed },
+                new BitmapDrawable(createSelectedBitmap(scaled, true)));
+        result.addState(new int[0], new BitmapDrawable(scaled));
+
+        result.setBounds(0, 0, mIconTextureWidth, mIconTextureHeight);
+        return result;
+    }
+
+    /**
+     * Returns a bitmap suitable for the all apps view.  The bitmap will be a power
+     * of two sized ARGB_8888 bitmap that can be used as a gl texture.
+     */
+    private Bitmap createIconBitmap(Drawable icon) {
+        int width = mIconWidth;
+        int height = mIconHeight;
+
+        if (icon instanceof PaintDrawable) {
+            PaintDrawable painter = (PaintDrawable) icon;
+            painter.setIntrinsicWidth(width);
+            painter.setIntrinsicHeight(height);
+        } else if (icon instanceof BitmapDrawable) {
+            // Ensure the bitmap has a density.
+            BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
+            Bitmap bitmap = bitmapDrawable.getBitmap();
+            if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
+                bitmapDrawable.setTargetDensity(mDisplayMetrics);
+            }
+        }
+        int sourceWidth = icon.getIntrinsicWidth();
+        int sourceHeight = icon.getIntrinsicHeight();
+
+        if (sourceWidth > 0 && sourceWidth > 0) {
+            // There are intrinsic sizes.
+            if (width < sourceWidth || height < sourceHeight) {
+                // It's too big, scale it down.
+                final float ratio = (float) sourceWidth / sourceHeight;
+                if (sourceWidth > sourceHeight) {
+                    height = (int) (width / ratio);
+                } else if (sourceHeight > sourceWidth) {
+                    width = (int) (height * ratio);
+                }
+            } else if (sourceWidth < width && sourceHeight < height) {
+                // It's small, use the size they gave us.
+                width = sourceWidth;
+                height = sourceHeight;
+            }
+        }
+
+        // no intrinsic size --> use default size
+        int textureWidth = mIconTextureWidth;
+        int textureHeight = mIconTextureHeight;
+
+        final Bitmap bitmap = Bitmap.createBitmap(textureWidth, textureHeight,
+                Bitmap.Config.ARGB_8888);
+        final Canvas canvas = mCanvas;
+        canvas.setBitmap(bitmap);
+
+        final int left = (textureWidth-width) / 2;
+        final int top = (textureHeight-height) / 2;
+
+        if (false) {
+            // draw a big box for the icon for debugging
+            canvas.drawColor(sColors[mColorIndex]);
+            if (++mColorIndex >= sColors.length) mColorIndex = 0;
+            Paint debugPaint = new Paint();
+            debugPaint.setColor(0xffcccc00);
+            canvas.drawRect(left, top, left+width, top+height, debugPaint);
+        }
+
+        mOldBounds.set(icon.getBounds());
+        icon.setBounds(left, top, left+width, top+height);
+        icon.draw(canvas);
+        icon.setBounds(mOldBounds);
+
+        return bitmap;
+    }
+
+    private Bitmap createSelectedBitmap(Bitmap src, boolean pressed) {
+        final Bitmap result = Bitmap.createBitmap(mIconTextureWidth, mIconTextureHeight,
+                Bitmap.Config.ARGB_8888);
+        final Canvas dest = new Canvas(result);
+
+        dest.drawColor(0, PorterDuff.Mode.CLEAR);
+
+        int[] xy = new int[2];
+        Bitmap mask = src.extractAlpha(mBlurPaint, xy);
+
+        dest.drawBitmap(mask, xy[0], xy[1],
+                pressed ? mGlowColorPressedPaint : mGlowColorFocusedPaint);
+
+        mask.recycle();
+
+        dest.drawBitmap(src, 0, 0, mPaint);
+
+        return result;
+    }
+}
diff --git a/policy/com/android/internal/policy/impl/RecentApplicationsBackground.java b/policy/com/android/internal/policy/impl/RecentApplicationsBackground.java
new file mode 100644
index 0000000..7c99e87
--- /dev/null
+++ b/policy/com/android/internal/policy/impl/RecentApplicationsBackground.java
@@ -0,0 +1,152 @@
+/*
+ * 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.internal.policy.impl;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.LinearLayout;
+
+/**
+ * A vertical linear layout.  However, instead of drawing the background
+ * behnd the items, it draws the background outside the items based on the
+ * padding.  If there isn't enough room to draw both, it clips the background
+ * instead of the contents.
+ */
+public class RecentApplicationsBackground extends LinearLayout {
+    private static final String TAG = "RecentApplicationsBackground";
+
+    private boolean mBackgroundSizeChanged;
+    private Drawable mBackground;
+    private Rect mTmp0 = new Rect();
+    private Rect mTmp1 = new Rect();
+
+    public RecentApplicationsBackground(Context context) {
+        this(context, null);
+        init();
+    }
+
+    public RecentApplicationsBackground(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    private void init() {
+        mBackground = getBackground();
+        setBackgroundDrawable(null);
+        setPadding(0, 0, 0, 0);
+        setGravity(Gravity.CENTER);
+    }
+
+    @Override
+    protected boolean setFrame(int left, int top, int right, int bottom) {
+        setWillNotDraw(false);
+        if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
+            mBackgroundSizeChanged = true;
+        }
+        return super.setFrame(left, top, right, bottom);
+    }
+
+    @Override
+    protected boolean verifyDrawable(Drawable who) {
+        return who == mBackground || super.verifyDrawable(who);
+    }
+
+    @Override
+    protected void drawableStateChanged() {
+        Drawable d = mBackground;
+        if (d != null && d.isStateful()) {
+            d.setState(getDrawableState());
+        }
+        super.drawableStateChanged();
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        final Drawable background = mBackground;
+        if (background != null) {
+            if (mBackgroundSizeChanged) {
+                mBackgroundSizeChanged = false;
+                Rect chld = mTmp0;
+                Rect bkg = mTmp1;
+                mBackground.getPadding(bkg);
+                getChildBounds(chld);
+                // This doesn't clamp to this view's bounds, which is what we want,
+                // so that the drawing is clipped.
+                final int top = chld.top - bkg.top;
+                final int bottom = chld.bottom + bkg.bottom;
+                // The background here is a gradient that wants to
+                // extend the full width of the screen (whatever that
+                // may be).
+                int left, right;
+                if (false) {
+                    // This limits the width of the drawable.
+                    left = chld.left - bkg.left;
+                    right = chld.right + bkg.right;
+                } else {
+                    // This expands it to full width.
+                    left = 0;
+                    right = getRight();
+                }
+                background.setBounds(left, top, right, bottom);
+            }
+        }
+        mBackground.draw(canvas);
+
+        if (false) {
+            android.graphics.Paint p = new android.graphics.Paint();
+            p.setColor(0x88ffff00);
+            canvas.drawRect(background.getBounds(), p);
+        }
+        canvas.drawARGB((int)(0.75*0xff), 0, 0, 0);
+
+        super.draw(canvas);
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        mBackground.setCallback(this);
+        setWillNotDraw(false);
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        mBackground.setCallback(null);
+    }
+    
+    private void getChildBounds(Rect r) {
+        r.left = r.top = Integer.MAX_VALUE;
+        r.bottom = r.right = Integer.MIN_VALUE;
+        final int N = getChildCount();
+        for (int i=0; i<N; i++) {
+            View v = getChildAt(i);
+            if (v.getVisibility() == View.VISIBLE) {
+                r.left = Math.min(r.left, v.getLeft());
+                r.top = Math.min(r.top, v.getTop());
+                r.right = Math.max(r.right, v.getRight());
+                r.bottom = Math.max(r.bottom, v.getBottom());
+            }
+        }
+    }
+}
diff --git a/policy/com/android/internal/policy/impl/RecentApplicationsDialog.java b/policy/com/android/internal/policy/impl/RecentApplicationsDialog.java
index c5aafa5..8287253 100644
--- a/policy/com/android/internal/policy/impl/RecentApplicationsDialog.java
+++ b/policy/com/android/internal/policy/impl/RecentApplicationsDialog.java
@@ -44,14 +44,13 @@ public class RecentApplicationsDialog extends Dialog implements OnClickListener
 
     static private StatusBarManager sStatusBar;
 
-    private static final int NUM_BUTTONS = 6;
+    private static final int NUM_BUTTONS = 8;
     private static final int MAX_RECENT_TASKS = NUM_BUTTONS * 2;    // allow for some discards
 
-    final View[] mButtons = new View[NUM_BUTTONS];
+    final TextView[] mIcons = new TextView[NUM_BUTTONS];
     View mNoAppsText;
     IntentFilter mBroadcastIntentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
 
-
     private int mIconSize;
 
     public RecentApplicationsDialog(Context context) {
@@ -77,26 +76,32 @@ public class RecentApplicationsDialog extends Dialog implements OnClickListener
             sStatusBar = (StatusBarManager)context.getSystemService(Context.STATUS_BAR_SERVICE);
         }
 
-        Window theWindow = getWindow();
-        theWindow.requestFeature(Window.FEATURE_NO_TITLE);
-        theWindow.setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
-        theWindow.setFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND,
-                WindowManager.LayoutParams.FLAG_DIM_BEHIND);
-        theWindow.setFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
+        Window window = getWindow();
+        window.requestFeature(Window.FEATURE_NO_TITLE);
+        window.setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
+        window.setFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
                 WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
-        theWindow.setTitle("Recents");
+        window.setTitle("Recents");
 
         setContentView(com.android.internal.R.layout.recent_apps_dialog);
 
-        mButtons[0] = findViewById(com.android.internal.R.id.button1);
-        mButtons[1] = findViewById(com.android.internal.R.id.button2);
-        mButtons[2] = findViewById(com.android.internal.R.id.button3);
-        mButtons[3] = findViewById(com.android.internal.R.id.button4);
-        mButtons[4] = findViewById(com.android.internal.R.id.button5);
-        mButtons[5] = findViewById(com.android.internal.R.id.button6);
+        final WindowManager.LayoutParams params = window.getAttributes();
+        params.width = WindowManager.LayoutParams.MATCH_PARENT;
+        params.height = WindowManager.LayoutParams.MATCH_PARENT;
+        window.setAttributes(params);
+        window.setFlags(0, WindowManager.LayoutParams.FLAG_DIM_BEHIND);
+
+        mIcons[0] = (TextView)findViewById(com.android.internal.R.id.button0);
+        mIcons[1] = (TextView)findViewById(com.android.internal.R.id.button1);
+        mIcons[2] = (TextView)findViewById(com.android.internal.R.id.button2);
+        mIcons[3] = (TextView)findViewById(com.android.internal.R.id.button3);
+        mIcons[4] = (TextView)findViewById(com.android.internal.R.id.button4);
+        mIcons[5] = (TextView)findViewById(com.android.internal.R.id.button5);
+        mIcons[6] = (TextView)findViewById(com.android.internal.R.id.button6);
+        mIcons[7] = (TextView)findViewById(com.android.internal.R.id.button7);
         mNoAppsText = findViewById(com.android.internal.R.id.no_applications_message);
 
-        for (View b : mButtons) {
+        for (TextView b: mIcons) {
             b.setOnClickListener(this);
         }
     }
@@ -106,7 +111,7 @@ public class RecentApplicationsDialog extends Dialog implements OnClickListener
      */
     public void onClick(View v) {
 
-        for (View b : mButtons) {
+        for (TextView b: mIcons) {
             if (b == v) {
                 // prepare a launch intent and send it
                 Intent intent = (Intent)b.getTag();
@@ -143,9 +148,9 @@ public class RecentApplicationsDialog extends Dialog implements OnClickListener
         super.onStop();
 
         // dump extra memory we're hanging on to
-        for (View b : mButtons) {
-            setButtonAppearance(b, null, null);
-            b.setTag(null);
+        for (TextView icon: mIcons) {
+            icon.setCompoundDrawables(null, null, null, null);
+            icon.setTag(null);
         }
 
         if (sStatusBar != null) {
@@ -172,12 +177,14 @@ public class RecentApplicationsDialog extends Dialog implements OnClickListener
                 new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME),
                 0);
 
+        IconUtilities iconUtilities = new IconUtilities(getContext());
+
         // Performance note:  Our android performance guide says to prefer Iterator when
         // using a List class, but because we know that getRecentTasks() always returns
         // an ArrayList<>, we'll use a simple index instead.
-        int button = 0;
+        int index = 0;
         int numTasks = recentTasks.size();
-        for (int i = 0; i < numTasks && (button < NUM_BUTTONS); ++i) {
+        for (int i = 0; i < numTasks && (index < NUM_BUTTONS); ++i) {
             final ActivityManager.RecentTaskInfo info = recentTasks.get(i);
 
             // for debug purposes only, disallow first result to create empty lists
@@ -204,39 +211,29 @@ public class RecentApplicationsDialog extends Dialog implements OnClickListener
             if (resolveInfo != null) {
                 final ActivityInfo activityInfo = resolveInfo.activityInfo;
                 final String title = activityInfo.loadLabel(pm).toString();
-                final Drawable icon = activityInfo.loadIcon(pm);
+                Drawable icon = activityInfo.loadIcon(pm);
 
                 if (title != null && title.length() > 0 && icon != null) {
-                    final View b = mButtons[button];
-                    setButtonAppearance(b, title, icon);
-                    b.setTag(intent);
-                    b.setVisibility(View.VISIBLE);
-                    b.setPressed(false);
-                    b.clearFocus();
-                    ++button;
+                    final TextView tv = mIcons[index];
+                    tv.setText(title);
+                    icon = iconUtilities.createIconDrawable(icon);
+                    tv.setCompoundDrawables(null, icon, null, null);
+                    tv.setTag(intent);
+                    tv.setVisibility(View.VISIBLE);
+                    tv.setPressed(false);
+                    tv.clearFocus();
+                    ++index;
                 }
             }
         }
 
         // handle the case of "no icons to show"
-        mNoAppsText.setVisibility((button == 0) ? View.VISIBLE : View.GONE);
+        mNoAppsText.setVisibility((index == 0) ? View.VISIBLE : View.GONE);
 
         // hide the rest
-        for ( ; button < NUM_BUTTONS; ++button) {
-            mButtons[button].setVisibility(View.GONE);
-        }
-    }
-
-    /**
-     * Adjust appearance of each icon-button
-     */
-    private void setButtonAppearance(View theButton, final String theTitle, final Drawable icon) {
-        TextView tv = (TextView) theButton;
-        tv.setText(theTitle);
-        if (icon != null) {
-            icon.setBounds(0, 0, mIconSize, mIconSize);
+        for (; index < NUM_BUTTONS; ++index) {
+            mIcons[index].setVisibility(View.GONE);
         }
-        tv.setCompoundDrawables(null, icon, null, null);
     }
 
     /**