gecko/mobile/android/base/TextSelectionHandle.java

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/* 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, END };
private final HandleType mHandleType;
private final int mWidth;
private final int mHeight;
private final int mShadow;
private int mLeft;
private int mTop;
private PointF mGeckoPoint;
private int mTouchStartX;
private int mTouchStartY;
private RelativeLayout.LayoutParams mLayoutParams;
TextSelectionHandle(Context context, AttributeSet attrs) {
super(context, attrs);
setOnTouchListener(this);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TextSelectionHandle);
String handleType = a.getString(R.styleable.TextSelectionHandle_handleType);
mHandleType = handleType.equals("START") ? HandleType.START : HandleType.END;
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);
}
public boolean onTouch(View v, MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
mTouchStartX = Math.round(event.getX());
mTouchStartY = Math.round(event.getY());
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(Math.round(event.getX()), Math.round(event.getY()));
break;
}
}
return true;
}
private void move(int newX, int newY) {
mLeft = mLeft + newX - mTouchStartX;
mTop = mTop + newY - mTouchStartY;
LayerView layerView = GeckoApp.mAppContext.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 = (float) mLeft + (mHandleType.equals(HandleType.START) ? mWidth - mShadow : mShadow);
PointF geckoPoint = new PointF(left, (float) mTop);
geckoPoint = layerView.convertViewPointToLayerPoint(geckoPoint);
JSONObject args = new JSONObject();
try {
args.put("handleType", mHandleType.toString());
args.put("x", Math.round(geckoPoint.x));
args.put("y", Math.round(geckoPoint.y));
} catch (Exception e) {
Log.e(LOGTAG, "Error building JSON arguments for TextSelection:Move");
}
GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("TextSelection:Move", args.toString()));
setLayoutPosition();
}
void positionFromGecko(int left, int top) {
LayerView layerView = GeckoApp.mAppContext.getLayerView();
if (layerView == null) {
Log.e(LOGTAG, "Can't position handle because layerView is null");
return;
}
mGeckoPoint = new PointF((float) left, (float) top);
ImmutableViewportMetrics metrics = layerView.getViewportMetrics();
repositionWithViewport(metrics.viewportRectLeft, metrics.viewportRectTop, metrics.zoomFactor);
}
void repositionWithViewport(float x, float y, float zoom) {
PointF viewPoint = new PointF((mGeckoPoint.x * zoom) - x,
(mGeckoPoint.y * zoom) - y);
mLeft = Math.round(viewPoint.x) - (mHandleType.equals(HandleType.START) ? mWidth - mShadow : mShadow);
mTop = Math.round(viewPoint.y);
setLayoutPosition();
}
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 = mLeft;
mLayoutParams.topMargin = mTop;
setLayoutParams(mLayoutParams);
}
}