Adding outlines to side pages for widgets and wallpaper pages in the customization tray.

Change-Id: Ib2ec5e630c1c861003d0e0b5672ed69ef25c0b47

1 files changed, 218 insertions, 0 deletions

diff --git a/src/com/android/launcher2/PagedViewWidget.java b/src/com/android/launcher2/PagedViewWidget.java
new file mode 100644
index 000000000..40e507bb3
--- /dev/null
+++ b/src/com/android/launcher2/PagedViewWidget.java
@@ -0,0 +1,218 @@
+/*
+ * 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.launcher2;
+
+import android.appwidget.AppWidgetProviderInfo;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.drawable.Drawable;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Message;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import com.android.launcher.R;
+import com.android.launcher2.PagedView.PagedViewIconCache;
+
+/**
+ * The linear layout used strictly for the widget/wallpaper tab of the customization tray
+ */
+public class PagedViewWidget extends LinearLayout {
+    static final String TAG = "PagedViewWidgetLayout";
+
+    private final Paint mPaint = new Paint();
+    private static HolographicOutlineHelper sHolographicOutlineHelper;
+    private Bitmap mHolographicOutline;
+    private final Canvas mHolographicOutlineCanvas = new Canvas();
+    private FastBitmapDrawable mPreview;
+
+    private int mAlpha = 255;
+    private int mHolographicAlpha;
+
+    // Highlight colors
+    private int mHoloBlurColor;
+    private int mHoloOutlineColor;
+
+    private static final HandlerThread sWorkerThread = new HandlerThread("pagedviewwidget-helper");
+    static {
+        sWorkerThread.start();
+    }
+
+    private static final int MESSAGE_CREATE_HOLOGRAPHIC_OUTLINE = 1;
+
+    private static final Handler sWorker = new Handler(sWorkerThread.getLooper()) {
+        private DeferredHandler mHandler = new DeferredHandler();
+        public void handleMessage(Message msg) {
+            final PagedViewWidget widget = (PagedViewWidget) msg.obj;
+            final int prevAlpha = widget.mPreview.getAlpha();
+            final Bitmap outline = Bitmap.createBitmap(widget.getWidth(), widget.getHeight(),
+                    Bitmap.Config.ARGB_8888);
+
+            widget.mHolographicOutlineCanvas.setBitmap(outline);
+            widget.mHolographicOutlineCanvas.save();
+            widget.mHolographicOutlineCanvas.translate(widget.mPaddingLeft, widget.mPaddingTop);
+            widget.mPreview.setAlpha(255);
+            widget.mPreview.draw(widget.mHolographicOutlineCanvas);
+            widget.mPreview.setAlpha(prevAlpha);
+            widget.mHolographicOutlineCanvas.restore();
+
+            sHolographicOutlineHelper.applyExpensiveOutlineWithBlur(outline,
+                    widget.mHolographicOutlineCanvas, widget.mHoloBlurColor,
+                    widget.mHoloOutlineColor);
+
+            mHandler.post(new Runnable() {
+                public void run() {
+                    widget.mHolographicOutline = outline;
+                    widget.invalidate();
+                }
+            });
+        }
+    };
+
+    public PagedViewWidget(Context context) {
+        this(context, null);
+    }
+
+    public PagedViewWidget(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public PagedViewWidget(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PagedViewWidget,
+                defStyle, 0);
+        mHoloBlurColor = a.getColor(R.styleable.PagedViewWidget_blurColor, 0);
+        mHoloOutlineColor = a.getColor(R.styleable.PagedViewWidget_outlineColor, 0);
+        a.recycle();
+
+        if (sHolographicOutlineHelper == null) {
+            sHolographicOutlineHelper = new HolographicOutlineHelper();
+        }
+
+        setFocusable(true);
+        setWillNotDraw(false);
+        setClipToPadding(false);
+    }
+
+    private void queueHolographicOutlineCreation() {
+        // Generate the outline in the background
+        if (mHolographicOutline == null) {
+            Message m = sWorker.obtainMessage(MESSAGE_CREATE_HOLOGRAPHIC_OUTLINE);
+            m.obj = this;
+            sWorker.sendMessage(m);
+        }
+    }
+
+    public void applyFromAppWidgetProviderInfo(AppWidgetProviderInfo info,
+            FastBitmapDrawable preview, int maxWidth, int[] cellSpan) {
+        final ImageView image = (ImageView) findViewById(R.id.widget_preview);
+        image.setMaxWidth(maxWidth);
+        image.setImageDrawable(preview);
+        final TextView name = (TextView) findViewById(R.id.widget_name);
+        name.setText(info.label);
+        final TextView dims = (TextView) findViewById(R.id.widget_dims);
+        dims.setText(mContext.getString(R.string.widget_dims_format, cellSpan[0], cellSpan[1]));
+        mPreview = preview;
+    }
+
+    public void applyFromWallpaperInfo(ResolveInfo info, PackageManager packageManager,
+            FastBitmapDrawable preview, int maxWidth) {
+        ImageView image = (ImageView) findViewById(R.id.wallpaper_preview);
+        image.setMaxWidth(maxWidth);
+        image.setImageDrawable(preview);
+        TextView name = (TextView) findViewById(R.id.wallpaper_name);
+        name.setText(info.loadLabel(packageManager));
+        mPreview = preview;
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        // We eat up the touch events here, since the PagedView (which uses the same swiping
+        // touch code as Workspace previously) uses onInterceptTouchEvent() to determine when
+        // the user is scrolling between pages.  This means that if the pages themselves don't
+        // handle touch events, it gets forwarded up to PagedView itself, and it's own
+        // onTouchEvent() handling will prevent further intercept touch events from being called
+        // (it's the same view in that case).  This is not ideal, but to prevent more changes,
+        // we just always mark the touch event as handled.
+        return super.onTouchEvent(event) || true;
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (mAlpha > 0) {
+            super.onDraw(canvas);
+        }
+
+        // draw any blended overlays
+        if (mHolographicOutline != null && mHolographicAlpha > 0) {
+            mPaint.setAlpha(mHolographicAlpha);
+            canvas.drawBitmap(mHolographicOutline, 0, 0, mPaint);
+        }
+    }
+
+    @Override
+    protected boolean onSetAlpha(int alpha) {
+        return true;
+    }
+
+    @Override
+    public void setAlpha(float alpha) {
+        final float viewAlpha = sHolographicOutlineHelper.viewAlphaInterpolator(alpha);
+        final float holographicAlpha = sHolographicOutlineHelper.highlightAlphaInterpolator(alpha);
+        int newViewAlpha = (int) (viewAlpha * 255);
+        int newHolographicAlpha = (int) (holographicAlpha * 255);
+        if ((mAlpha != newViewAlpha) || (mHolographicAlpha != newHolographicAlpha)) {
+            mAlpha = newViewAlpha;
+            mHolographicAlpha = newHolographicAlpha;
+            setChildrenAlpha(viewAlpha);
+            super.setAlpha(viewAlpha);
+        }
+    }
+
+    private void setChildrenAlpha(float alpha) {
+        final int childCount = getChildCount();
+        for (int i = 0; i < childCount; i++) {
+            getChildAt(i).setAlpha(alpha);
+        }
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        if (w > 0 && h > 0) {
+            queueHolographicOutlineCreation();
+        }
+
+        super.onSizeChanged(w, h, oldw, oldh);
+    }
+
+    @Override
+    public void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        sWorker.removeMessages(MESSAGE_CREATE_HOLOGRAPHIC_OUTLINE, this);
+    }
+}