am eaa18dec: scroll text field with touch

Merge commit 'eaa18dec91b6dd0ce3191a9ab65cdc95ef68b935' into eclair-plus-aosp

* commit 'eaa18dec91b6dd0ce3191a9ab65cdc95ef68b935':
  scroll text field with touch

core/java/android/text/method/Touch.java

@@ -71,6 +71,24 @@ public class Touch {
         widget.scrollTo(x, y);
     }
 
+    /**
+     * @hide
+     * Returns the maximum scroll value in x.
+     */
+    public static int getMaxScrollX(TextView widget, Layout layout, int y) {
+        int top = layout.getLineForVertical(y);
+        int bottom = layout.getLineForVertical(y + widget.getHeight()
+                - widget.getTotalPaddingTop() -widget.getTotalPaddingBottom());
+        int left = Integer.MAX_VALUE;
+        int right = 0;
+        for (int i = top; i <= bottom; i++) {
+            left = (int) Math.min(left, layout.getLineLeft(i));
+            right = (int) Math.max(right, layout.getLineRight(i));
+        }
+        return right - left - widget.getWidth() - widget.getTotalPaddingLeft()
+                - widget.getTotalPaddingRight();
+    }
+
     /**
      * Handles touch events for dragging.  You may want to do other actions
      * like moving the cursor on touch as well.

core/java/android/webkit/WebTextView.java

@@ -275,25 +275,6 @@ import java.util.ArrayList;
         return false;
     }
 
-    /**
-     *  Create a fake touch up event at (x,y) with respect to this WebTextView.
-     *  This is used by WebView to act as though a touch event which happened
-     *  before we placed the WebTextView actually hit it, so that it can place
-     *  the cursor accordingly.
-     */
-    /* package */ void fakeTouchEvent(float x, float y) {
-        // We need to ensure that there is a Layout, since the Layout is used
-        // in determining where to place the cursor.
-        if (getLayout() == null) {
-            measure(mWidthSpec, mHeightSpec);
-        }
-        // Create a fake touch up, which is used to place the cursor.
-        MotionEvent ev = MotionEvent.obtain(0, 0, MotionEvent.ACTION_UP,
-                x, y, 0);
-        onTouchEvent(ev);
-        ev.recycle();
-    }
-
     /**
      *  Determine whether this WebTextView currently represents the node
      *  represented by ptr.
@@ -457,7 +438,14 @@ import java.util.ArrayList;
             int smallerSlop = slop/2;
             if (dx > smallerSlop || dy > smallerSlop) {
                 if (mWebView != null) {
-                    mWebView.scrollFocusedTextInput(mScrollX, mScrollY);
+                    float maxScrollX = (float) Touch.getMaxScrollX(this,
+                                getLayout(), mScrollY);
+                    if (DebugFlags.WEB_TEXT_VIEW) {
+                        Log.v(LOGTAG, "onTouchEvent x=" + mScrollX + " y="
+                                + mScrollY + " maxX=" + maxScrollX);
+                    }
+                    mWebView.scrollFocusedTextInput(maxScrollX > 0 ?
+                            mScrollX / maxScrollX : 0, mScrollY);
                 }
                 mScrolled = true;
                 return true;

core/java/android/webkit/WebView.java

@@ -3007,17 +3007,6 @@ public class WebView extends AbsoluteLayout
             if (mWebTextView == null) return;
 
             imm.showSoftInput(mWebTextView, 0);
-            // Now we need to fake a touch event to place the cursor where the
-            // user touched.
-            AbsoluteLayout.LayoutParams lp = (AbsoluteLayout.LayoutParams)
-                    mWebTextView.getLayoutParams();
-            if (lp != null) {
-                // Take the last touch and adjust for the location of the
-                // WebTextView.
-                float x = mLastTouchX + (float) (mScrollX - lp.x);
-                float y = mLastTouchY + (float) (mScrollY - lp.y);
-                mWebTextView.fakeTouchEvent(x, y);
-            }
             if (mInZoomOverview) {
                 // if in zoom overview mode, call doDoubleTap() to bring it back
                 // to normal mode so that user can enter text.
@@ -4505,18 +4494,19 @@ public class WebView extends AbsoluteLayout
 
     /**
      * Scroll the focused text field/area to match the WebTextView
-     * @param x New x position of the WebTextView in view coordinates
+     * @param xPercent New x position of the WebTextView from 0 to 1.
      * @param y New y position of the WebTextView in view coordinates
      */
-    /*package*/ void scrollFocusedTextInput(int x, int y) {
+    /*package*/ void scrollFocusedTextInput(float xPercent, int y) {
         if (!inEditingMode() || mWebViewCore == null) {
             return;
         }
-        mWebViewCore.sendMessage(EventHub.SCROLL_TEXT_INPUT, viewToContentX(x),
+        mWebViewCore.sendMessage(EventHub.SCROLL_TEXT_INPUT,
                 // Since this position is relative to the top of the text input
                 // field, we do not need to take the title bar's height into
                 // consideration.
-                viewToContentDimension(y));
+                viewToContentDimension(y),
+                new Float(xPercent));
     }
 
     /**

core/java/android/webkit/WebViewCore.java

@@ -872,7 +872,8 @@ final class WebViewCore {
                             break;
 
                         case SCROLL_TEXT_INPUT:
-                            nativeScrollFocusedTextInput(msg.arg1, msg.arg2);
+                            nativeScrollFocusedTextInput(
+                                    ((Float) msg.obj).floatValue(), msg.arg1);
                             break;
 
                         case LOAD_URL:
@@ -2076,9 +2077,9 @@ final class WebViewCore {
     private native void nativeUpdateFrameCacheIfLoading();
 
     /**
-     * Scroll the focused textfield to (x, y) in document space
+     * Scroll the focused textfield to (xPercent, y) in document space
      */
-    private native void nativeScrollFocusedTextInput(int x, int y);
+    private native void nativeScrollFocusedTextInput(float xPercent, int y);
 
     // these must be in document space (i.e. not scaled/zoomed).
     private native void nativeSetScrollOffset(int gen, int dx, int dy);