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/*
* Copyright (C) 2014 The CyanogenMod 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 org.cyanogenmod.theme.util;
import android.content.Context;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ScrollView;
/**
* A custom ScrollView capable of alerting its children when a scroll has changed.
*
* This custom view will also measure its children differently. Normally a child in scrollview
* receives an UNSPECIFIED MeasureSpec so that the child will size itself as large as it needs to be.
*
* In our case we want to have a unique layout where the first full page of the scrollview
* has very particular content
* ie the "drawer title/author", and the viewpager taking the remaining part of the screen", with the
* theme component checkboxes taking as much space as it needs.
*
**/
public class ChooserDetailScrollView extends ScrollView {
private float xDistance;
private float yDistance;
private float lastX;
private float lastY;
public ChooserDetailScrollView(Context context) {
super(context);
}
public ChooserDetailScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ChooserDetailScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed,
int parentHeightMeasureSpec, int heightUsed) {
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec,
mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin
+ widthUsed, lp.width);
child.measure(childWidthMeasureSpec, parentHeightMeasureSpec);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
xDistance = yDistance = 0f;
lastX = ev.getX();
lastY = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
final float curX = ev.getX();
final float curY = ev.getY();
xDistance = Math.abs(curX - lastX);
yDistance = Math.abs(curY - lastY);
lastX = curX;
lastY = curY;
if(xDistance > yDistance) return false;
}
return super.onInterceptTouchEvent(ev);
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
((ChooserDetailLinearLayout)getChildAt(0)).onScrollChanged(l, t, oldl, oldt);
}
public View getHandle() {
return ((ChooserDetailLinearLayout)getChildAt(0)).getHandle();
}
}
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