1 files changed, 179 insertions, 0 deletions
diff --git a/src/com/android/browser/BrowserWebView.java b/src/com/android/browser/BrowserWebView.java
new file mode 100644
index 0000000..a1d8c2d
--- /dev/null
+++ b/src/com/android/browser/BrowserWebView.java
@@ -0,0 +1,179 @@
+/*
+ * 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.browser;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.webkit.WebView;
+
+import java.util.Map;
+
+/**
+ * Manage WebView scroll events
+ */
+public class BrowserWebView extends WebView implements Runnable {
+
+    private ScrollListener mScrollListener;
+    private boolean mIsCancelled;
+    private boolean mBackgroundRemoved = false;
+    private boolean mUserInitiated = false;
+    private TitleBarBase mTitleBar;
+    private int mCaptureSize;
+    private Bitmap mCapture;
+
+    /**
+     * @param context
+     * @param attrs
+     * @param defStyle
+     * @param javascriptInterfaces
+     */
+    public BrowserWebView(Context context, AttributeSet attrs, int defStyle,
+            Map<String, Object> javascriptInterfaces, boolean privateBrowsing) {
+        super(context, attrs, defStyle, javascriptInterfaces, privateBrowsing);
+    }
+
+    /**
+     * @param context
+     * @param attrs
+     * @param defStyle
+     */
+    public BrowserWebView(
+            Context context, AttributeSet attrs, int defStyle, boolean privateBrowsing) {
+        super(context, attrs, defStyle, privateBrowsing);
+        init();
+    }
+
+    /**
+     * @param context
+     * @param attrs
+     */
+    public BrowserWebView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    /**
+     * @param context
+     */
+    public BrowserWebView(Context context) {
+        super(context);
+        init();
+    }
+
+    private void init() {
+        mCaptureSize = mContext.getResources().getDimensionPixelSize(R.dimen.tab_capture_size);
+        mCapture = Bitmap.createBitmap(mCaptureSize, mCaptureSize,
+                Bitmap.Config.RGB_565);
+    }
+
+    @Override
+    protected int getTitleHeight() {
+        return (mTitleBar != null) ? mTitleBar.getEmbeddedHeight() : 0;
+    }
+
+    // scroll runnable implementation
+    public void run() {
+        if (!mIsCancelled && (mScrollListener != null)) {
+            mScrollListener.onScroll(getVisibleTitleHeight(), mUserInitiated);
+        }
+    }
+
+    void hideEmbeddedTitleBar() {
+        scrollBy(0, getVisibleTitleHeight());
+    }
+
+    @Override
+    public void setEmbeddedTitleBar(final View title) {
+        super.setEmbeddedTitleBar(title);
+        mTitleBar = (TitleBarBase) title;
+        if (title != null && mScrollListener != null) {
+            // allow the scroll listener to initialize its state
+            post(this);
+        }
+    }
+
+    public boolean hasTitleBar() {
+        return (mTitleBar != null);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent evt) {
+        if (MotionEvent.ACTION_DOWN == evt.getActionMasked()) {
+            mUserInitiated = true;
+        } else if (MotionEvent.ACTION_UP == evt.getActionMasked()
+                || (MotionEvent.ACTION_CANCEL == evt.getActionMasked())) {
+            mUserInitiated = false;
+        }
+        return super.onTouchEvent(evt);
+    }
+
+    @Override
+    public void stopScroll() {
+        mIsCancelled = true;
+        super.stopScroll();
+    }
+
+    @Override
+    protected void onScrollChanged(int l, final int t, int ol, int ot) {
+        super.onScrollChanged(l, t, ol, ot);
+        if (!mIsCancelled) {
+            post(this);
+        } else {
+            mIsCancelled = false;
+        }
+    }
+
+    void setScrollListener(ScrollListener l) {
+        mScrollListener = l;
+    }
+
+    // callback for scroll events
+
+    interface ScrollListener {
+        public void onScroll(int visibleTitleHeight, boolean userInitiated);
+    }
+
+    protected Bitmap capture() {
+        if (mCapture == null) return null;
+        Canvas c = new Canvas(mCapture);
+        final int left = getScrollX();
+        final int top = getScrollY() + getVisibleTitleHeight();
+        c.translate(-left, -top);
+        float scale = mCaptureSize / (float) Math.max(getWidth(), getHeight());
+        c.scale(scale, scale, left, top);
+        onDraw(c);
+        return mCapture;
+    }
+
+    @Override
+    protected void onDraw(android.graphics.Canvas c) {
+        super.onDraw(c);
+        if (!mBackgroundRemoved && getRootView().getBackground() != null) {
+            mBackgroundRemoved = true;
+            post(new Runnable() {
+                public void run() {
+                    getRootView().setBackgroundDrawable(null);
+                }
+            });
+        }
+    }
+
+}