The Tor Browser: mobile/android/base/TextSelectionHandle.java@b8a032363ba2 (annotated)

mobile/android/base/TextSelectionHandle.java@b8a032363ba2 (annotated)

mobile/android/base/TextSelectionHandle.java

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

  /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 package org.mozilla.gecko;
 import org.mozilla.gecko.gfx.ImmutableViewportMetrics;
 import org.mozilla.gecko.gfx.LayerView;
 import org.json.JSONObject;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.PointF;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.view.MotionEvent;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.RelativeLayout;
 class TextSelectionHandle extends ImageView implements View.OnTouchListener {
     private static final String LOGTAG = "GeckoTextSelectionHandle";
     private enum HandleType { START, MIDDLE, END };
     private final HandleType mHandleType;
     private final int mWidth;
     private final int mHeight;
     private final int mShadow;
     private float mLeft;
     private float mTop;
     private boolean mIsRTL;
     private PointF mGeckoPoint;
     private float mTouchStartX;
     private float mTouchStartY;
     private int mLayerViewX;
     private int mLayerViewY;
     private RelativeLayout.LayoutParams mLayoutParams;
     private static final int IMAGE_LEVEL_LTR = 0;
     private static final int IMAGE_LEVEL_RTL = 1;
     public TextSelectionHandle(Context context, AttributeSet attrs) {
         super(context, attrs);
         setOnTouchListener(this);
         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TextSelectionHandle);
         int handleType = a.getInt(R.styleable.TextSelectionHandle_handleType, 0x01);
         if (handleType == 0x01)
             mHandleType = HandleType.START;
         else if (handleType == 0x02)
             mHandleType = HandleType.MIDDLE;
         else
             mHandleType = HandleType.END;
         mIsRTL = false;
         mGeckoPoint = new PointF(0.0f, 0.0f);
         mWidth = getResources().getDimensionPixelSize(R.dimen.text_selection_handle_width);
         mHeight = getResources().getDimensionPixelSize(R.dimen.text_selection_handle_height);
         mShadow = getResources().getDimensionPixelSize(R.dimen.text_selection_handle_shadow);
     }
     @Override
     public boolean onTouch(View v, MotionEvent event) {
         switch (event.getActionMasked()) {
             case MotionEvent.ACTION_DOWN: {
                 mTouchStartX = event.getX();
                 mTouchStartY = event.getY();
                 int[] rect = new int[2];
                 GeckoAppShell.getLayerView().getLocationOnScreen(rect);
                 mLayerViewX = rect[0];
                 mLayerViewY = rect[1];
                 break;
             }
             case MotionEvent.ACTION_UP: {
                 mTouchStartX = 0;
                 mTouchStartY = 0;
                 // Reposition handles to line up with ends of selection
                 JSONObject args = new JSONObject();
                 try {
                     args.put("handleType", mHandleType.toString());
                 } catch (Exception e) {
                     Log.e(LOGTAG, "Error building JSON arguments for TextSelection:Position");
                 }
                 GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:Position", args.toString()));
                 break;
             }
             case MotionEvent.ACTION_MOVE: {
                 move(event.getRawX(), event.getRawY());
                 break;
             }
         }
         return true;
     }
     private void move(float newX, float newY) {
         // newX and newY are absolute coordinates, so we need to adjust them to
         // account for other views on the screen (such as the URL bar). We also
         // need to include the offset amount of the touch location relative to
         // the top left of the handle (mTouchStartX and mTouchStartY).
         mLeft = newX - mLayerViewX - mTouchStartX;
         mTop = newY - mLayerViewY - mTouchStartY;
         LayerView layerView = GeckoAppShell.getLayerView();
         if (layerView == null) {
             Log.e(LOGTAG, "Can't move selection because layerView is null");
             return;
         }
         // Send x coordinate on the right side of the start handle, left side of the end handle.
         float left = mLeft + adjustLeftForHandle();
         PointF geckoPoint = new PointF(left, mTop);
         geckoPoint = layerView.convertViewPointToLayerPoint(geckoPoint);
         JSONObject args = new JSONObject();
         try {
             args.put("handleType", mHandleType.toString());
             args.put("x", (int) geckoPoint.x);
             args.put("y", (int) geckoPoint.y);
         } catch (Exception e) {
             Log.e(LOGTAG, "Error building JSON arguments for TextSelection:Move");
         }
         GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:Move", args.toString()));
         // If we're positioning a cursor, don't move the handle here. Gecko
         // will tell us the position of the caret, so we set the handle
         // position then. This allows us to lock the handle to wherever the
         // caret appears.
         if (!mHandleType.equals(HandleType.MIDDLE)) {
             setLayoutPosition();
         }
     }
     void positionFromGecko(int left, int top, boolean rtl) {
         LayerView layerView = GeckoAppShell.getLayerView();
         if (layerView == null) {
             Log.e(LOGTAG, "Can't position handle because layerView is null");
             return;
         }
         mGeckoPoint = new PointF(left, top);
         if (mIsRTL != rtl) {
             mIsRTL = rtl;
             setImageLevel(mIsRTL ? IMAGE_LEVEL_RTL : IMAGE_LEVEL_LTR);
         }
         ImmutableViewportMetrics metrics = layerView.getViewportMetrics();
         PointF offset = metrics.getMarginOffset();
         repositionWithViewport(metrics.viewportRectLeft - offset.x, metrics.viewportRectTop - offset.y, metrics.zoomFactor);
     }
     void repositionWithViewport(float x, float y, float zoom) {
         PointF viewPoint = new PointF((mGeckoPoint.x * zoom) - x,
                                       (mGeckoPoint.y * zoom) - y);
         mLeft = viewPoint.x - adjustLeftForHandle();
         mTop = viewPoint.y;
         setLayoutPosition();
     }
     private float adjustLeftForHandle() {
         if (mHandleType.equals(HandleType.START))
             return mIsRTL ? mShadow : mWidth - mShadow;
         else if (mHandleType.equals(HandleType.MIDDLE))
             return mWidth / 2;
         else
             return mIsRTL ? mWidth - mShadow : mShadow;
     }
     private void setLayoutPosition() {
         if (mLayoutParams == null) {
             mLayoutParams = (RelativeLayout.LayoutParams) getLayoutParams();
             // Set negative right/bottom margins so that the handles can be dragged outside of
             // the content area (if they are dragged to the left/top, the dyanmic margins set
             // below will take care of that).
             mLayoutParams.rightMargin = 0 - mWidth;
             mLayoutParams.bottomMargin = 0 - mHeight;
         }
         mLayoutParams.leftMargin = (int) mLeft;
         mLayoutParams.topMargin = (int) mTop;
         setLayoutParams(mLayoutParams);
     }
 }

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mobile/android/base/TextSelectionHandle.java@b8a032363ba2 (annotated)

mobile/android/base/TextSelectionHandle.java