/*
* Copyright 2013, Edmodo, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with the License.
* You may obtain a copy of the License in the LICENSE file, or 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.marshalchen.common.uimodule.cropperimage.cropwindow.handle;
import android.graphics.Rect;
import com.marshalchen.common.uimodule.cropperimage.cropwindow.edge.Edge;
import com.marshalchen.common.uimodule.cropperimage.util.AspectRatioUtil;
/**
* Handle helper class to handle horizontal handles (i.e. top and bottom
* handles).
*/
class HorizontalHandleHelper extends HandleHelper {
// Member Variables ////////////////////////////////////////////////////////
private Edge mEdge;
// Constructor /////////////////////////////////////////////////////////////
HorizontalHandleHelper(Edge edge) {
super(edge, null);
mEdge = edge;
}
// HandleHelper Methods ////////////////////////////////////////////////////
@Override
void updateCropWindow(float x,
float y,
float targetAspectRatio,
Rect imageRect,
float snapRadius) {
// Adjust this Edge accordingly.
mEdge.adjustCoordinate(x, y, imageRect, snapRadius, targetAspectRatio);
float left = Edge.LEFT.getCoordinate();
float top = Edge.TOP.getCoordinate();
float right = Edge.RIGHT.getCoordinate();
float bottom = Edge.BOTTOM.getCoordinate();
// After this Edge is moved, our crop window is now out of proportion.
final float targetWidth = AspectRatioUtil.calculateWidth(top, bottom, targetAspectRatio);
final float currentWidth = right - left;
// Adjust the crop window so that it maintains the given aspect ratio by
// moving the adjacent edges symmetrically in or out.
final float difference = targetWidth - currentWidth;
final float halfDifference = difference / 2;
left -= halfDifference;
right += halfDifference;
Edge.LEFT.setCoordinate(left);
Edge.RIGHT.setCoordinate(right);
// Check if we have gone out of bounds on the sides, and fix.
if (Edge.LEFT.isOutsideMargin(imageRect, snapRadius) && !mEdge.isNewRectangleOutOfBounds(Edge.LEFT,
imageRect,
targetAspectRatio)) {
final float offset = Edge.LEFT.snapToRect(imageRect);
Edge.RIGHT.offset(-offset);
mEdge.adjustCoordinate(targetAspectRatio);
}
if (Edge.RIGHT.isOutsideMargin(imageRect, snapRadius) && !mEdge.isNewRectangleOutOfBounds(Edge.RIGHT,
imageRect,
targetAspectRatio)) {
final float offset = Edge.RIGHT.snapToRect(imageRect);
Edge.LEFT.offset(-offset);
mEdge.adjustCoordinate(targetAspectRatio);
}
}
}