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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.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
/**
* This class will layout its children in a very specific way. It assumes it is a child of a
* scroll view.
*
* The first two children are assumed to be the "theme preview" and the "drawer handle" which will
* be visible. These children will be restricted in their size since they must be entirely visible.
* The third child will be shown as the user scrolls down and can take as much space as it needs.
*/
public class ChooserDetailLinearLayout extends LinearLayout {
// The smaller this value the greater the effect
public final int PARALLAX_CONSTANT = 2;
// Child indices
public final int THEME_PREVIEW_INDEX = 0;
public final int DRAWER_HANDLE_INDEX = 1;
public final int DRAWER_CONTENT_INDEX = 2;
public final int PAGE_INDICATOR_INDEX = 3;
private ViewPager mPager;
public ChooserDetailLinearLayout(Context context) {
super(context);
}
public ChooserDetailLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ChooserDetailLinearLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
/**
* Assumes the heightMeasureSpec will be exact. This exact data will be used
* to determine the visible page size.
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
// Drawer handle is just author/title. Should get whatever space it needs
View drawerHandle = getChildAt(DRAWER_HANDLE_INDEX);
measureChildWithMargins(drawerHandle, widthMeasureSpec, 0, heightMeasureSpec, 0);
// Give the theme preview the remainder
View themePreview = getChildAt(THEME_PREVIEW_INDEX);
int usedHeight = drawerHandle.getMeasuredHeight();
measureChildWithMargins(themePreview, widthMeasureSpec, 0, heightMeasureSpec, usedHeight);
// Give the drawer content as much as space as it needs.
View drawerContent = getChildAt(DRAWER_CONTENT_INDEX);
final MarginLayoutParams lp = (MarginLayoutParams) drawerContent.getLayoutParams();
int childWidthSpec = getChildMeasureSpec(widthMeasureSpec, 0, lp.width);
int childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
drawerContent.measure(childWidthSpec, childHeightSpec);
//Give the page indicator as much space as it needs
View pageIndicator = getChildAt(PAGE_INDICATOR_INDEX);
pageIndicator.measure(childWidthSpec, childHeightSpec);
// Measure ourself
int width = drawerHandle.getMeasuredWidth();
int height = themePreview.getMeasuredHeight() +
drawerHandle.getMeasuredHeight() + drawerContent.getMeasuredHeight();
setMeasuredDimension(width, height);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
// Place the page indicator above the drawer handle
View pageIndicator = getChildAt(PAGE_INDICATOR_INDEX);
int top = getChildAt(DRAWER_HANDLE_INDEX).getTop();
int height = pageIndicator.getMeasuredHeight();
pageIndicator.layout(l, top-height, r, top);
}
public void onScrollChanged(int l, int t, int oldl, int oldt) {
// Give a parallax effect to the theme preview by scrolling in the
// opposite direction of the scrollview
int yScroll = (int) (-t / PARALLAX_CONSTANT);
getChildAt(THEME_PREVIEW_INDEX).scrollTo(0, yScroll);
}
View getHandle() {
return getChildAt(DRAWER_HANDLE_INDEX);
}
}
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