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FadingActionBar: onClickListener to header view
/*
* Copyright (C) 2013 Manuel Peinado
* onCliListener to header view implementations by: Giovanni Rocca (iGio90)
*
* 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 com.manuelpeinado.fadingactionbar;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.FrameLayout;
import android.widget.ListView;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.manuelpeinado.fadingactionbar.view.ObservableScrollView;
import com.manuelpeinado.fadingactionbar.view.ObservableWebViewWithHeader;
import com.manuelpeinado.fadingactionbar.view.OnScrollChangedCallback;
@SuppressWarnings("unchecked")
public abstract class FadingActionBarHelperBase {
protected static final String TAG = "FadingActionBarHelper";
private Drawable mActionBarBackgroundDrawable;
private FrameLayout mHeaderContainer;
private int mActionBarBackgroundResId;
private int mHeaderLayoutResId;
private View mHeaderView;
private int mHeaderOverlayLayoutResId;
private View mHeaderOverlayView;
private int mContentLayoutResId;
private View mContentView;
private LayoutInflater mInflater;
private boolean mLightActionBar;
private boolean mUseParallax = true;
private int mLastDampedScroll;
private int mLastHeaderHeight = -1;
private boolean mFirstGlobalLayoutPerformed;
private FrameLayout mMarginView;
private View mListViewBackgroundView;
private View.OnClickListener mListener;
public final <T extends FadingActionBarHelperBase> T actionBarBackground(int drawableResId) {
mActionBarBackgroundResId = drawableResId;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T actionBarBackground(Drawable drawable) {
mActionBarBackgroundDrawable = drawable;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T headerLayout(int layoutResId) {
mHeaderLayoutResId = layoutResId;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T headerView(View view) {
mHeaderView = view;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T headerOverlayLayout(int layoutResId) {
mHeaderOverlayLayoutResId = layoutResId;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T headerOverlayView(View view) {
mHeaderOverlayView = view;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T contentLayout(int layoutResId) {
mContentLayoutResId = layoutResId;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T contentView(View view) {
mContentView = view;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T lightActionBar(boolean value) {
mLightActionBar = value;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T parallax(boolean value) {
mUseParallax = value;
return (T)this;
}
public final <T extends FadingActionBarHelperBase> T onHeaderClickListener(View.OnClickListener listener) {
mListener = listener;
return (T)this;
}
public final View createView(Context context) {
return createView(LayoutInflater.from(context));
}
public final View createView(LayoutInflater inflater) {
//
// Prepare everything
mInflater = inflater;
if (mContentView == null) {
mContentView = inflater.inflate(mContentLayoutResId, null);
}
if (mHeaderView == null) {
mHeaderView = inflater.inflate(mHeaderLayoutResId, null, false);
}
//
// See if we are in a ListView, WebView or ScrollView scenario
ListView listView = (ListView) mContentView.findViewById(android.R.id.list);
View root;
if (listView != null) {
root = createListView(listView);
} else if (mContentView instanceof ObservableWebViewWithHeader){
root = createWebView();
} else {
root = createScrollView();
}
if (mHeaderOverlayView == null && mHeaderOverlayLayoutResId != 0) {
mHeaderOverlayView = inflater.inflate(mHeaderOverlayLayoutResId, mMarginView, false);
}
if (mHeaderOverlayView != null) {
mMarginView.addView(mHeaderOverlayView);
}
// Use measured height here as an estimate of the header height, later on after the layout is complete
// we'll use the actual height
int widthMeasureSpec = MeasureSpec.makeMeasureSpec(LayoutParams.MATCH_PARENT, MeasureSpec.EXACTLY);
int heightMeasureSpec = MeasureSpec.makeMeasureSpec(LayoutParams.WRAP_CONTENT, MeasureSpec.EXACTLY);
mHeaderView.measure(widthMeasureSpec, heightMeasureSpec);
updateHeaderHeight(mHeaderView.getMeasuredHeight());
root.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
int headerHeight = mHeaderContainer.getHeight();
if (!mFirstGlobalLayoutPerformed && headerHeight != 0) {
updateHeaderHeight(headerHeight);
mFirstGlobalLayoutPerformed = true;
}
}
});
return root;
}
public void initActionBar(Activity activity) {
if (mActionBarBackgroundDrawable == null) {
mActionBarBackgroundDrawable = activity.getResources().getDrawable(mActionBarBackgroundResId);
}
setActionBarBackgroundDrawable(mActionBarBackgroundDrawable);
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN) {
mActionBarBackgroundDrawable.setCallback(mDrawableCallback);
}
mActionBarBackgroundDrawable.setAlpha(0);
}
protected abstract int getActionBarHeight();
protected abstract boolean isActionBarNull();
protected abstract void setActionBarBackgroundDrawable(Drawable drawable);
protected <T> T getActionBarWithReflection(Activity activity, String methodName) {
try {
Method method = activity.getClass().getMethod(methodName);
return (T)method.invoke(activity);
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (ClassCastException e) {
e.printStackTrace();
}
return null;
}
private Drawable.Callback mDrawableCallback = new Drawable.Callback() {
@Override
public void invalidateDrawable(Drawable who) {
setActionBarBackgroundDrawable(who);
}
@Override
public void scheduleDrawable(Drawable who, Runnable what, long when) {
}
@Override
public void unscheduleDrawable(Drawable who, Runnable what) {
}
};
private View createWebView() {
ViewGroup webViewContainer = (ViewGroup) mInflater.inflate(R.layout.fab__webview_container, null);
ObservableWebViewWithHeader webView = (ObservableWebViewWithHeader) mContentView;
webView.setOnScrollChangedCallback(mOnScrollChangedListener);
webViewContainer.addView(webView);
mHeaderContainer = (FrameLayout) webViewContainer.findViewById(R.id.fab__header_container);
initializeGradient(mHeaderContainer);
mHeaderContainer.addView(mHeaderView, 0);
mMarginView = new FrameLayout(webView.getContext());
mMarginView.setBackgroundColor(Color.TRANSPARENT);
mMarginView.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
webView.addView(mMarginView);
return webViewContainer;
}
private View createScrollView() {
ViewGroup scrollViewContainer = (ViewGroup) mInflater.inflate(R.layout.fab__scrollview_container, null);
ObservableScrollView scrollView = (ObservableScrollView) scrollViewContainer.findViewById(R.id.fab__scroll_view);
scrollView.setOnScrollChangedCallback(mOnScrollChangedListener);
ViewGroup contentContainer = (ViewGroup) scrollViewContainer.findViewById(R.id.fab__container);
contentContainer.addView(mContentView);
mHeaderContainer = (FrameLayout) scrollViewContainer.findViewById(R.id.fab__header_container);
initializeGradient(mHeaderContainer);
mHeaderContainer.addView(mHeaderView, 0);
mMarginView = (FrameLayout) contentContainer.findViewById(R.id.fab__content_top_margin);
if(mListener != null) {
mMarginView.setOnClickListener(mListener);
}
return scrollViewContainer;
}
private OnScrollChangedCallback mOnScrollChangedListener = new OnScrollChangedCallback() {
public void onScroll(int l, int t) {
onNewScroll(t);
}
};
private View createListView(ListView listView) {
ViewGroup contentContainer = (ViewGroup) mInflater.inflate(R.layout.fab__listview_container, null);
contentContainer.addView(mContentView);
mHeaderContainer = (FrameLayout) contentContainer.findViewById(R.id.fab__header_container);
initializeGradient(mHeaderContainer);
mHeaderContainer.addView(mHeaderView, 0);
mMarginView = new FrameLayout(listView.getContext());
mMarginView.setLayoutParams(new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT, 0));
listView.addHeaderView(mMarginView, null, false);
// Make the background as high as the screen so that it fills regardless of the amount of scroll.
mListViewBackgroundView = contentContainer.findViewById(R.id.fab__listview_background);
FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) mListViewBackgroundView.getLayoutParams();
params.height = Utils.getDisplayHeight(listView.getContext());
mListViewBackgroundView.setLayoutParams(params);
listView.setOnScrollListener(mOnScrollListener);
return contentContainer;
}
private OnScrollListener mOnScrollListener = new OnScrollListener() {
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
View topChild = view.getChildAt(0);
if (topChild == null) {
onNewScroll(0);
} else if (topChild != mMarginView) {
onNewScroll(mHeaderContainer.getHeight());
} else {
onNewScroll(-topChild.getTop());
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
};
private int mLastScrollPosition;
private void onNewScroll(int scrollPosition) {
if (isActionBarNull()) {
return;
}
int currentHeaderHeight = mHeaderContainer.getHeight();
if (currentHeaderHeight != mLastHeaderHeight) {
updateHeaderHeight(currentHeaderHeight);
}
int headerHeight = currentHeaderHeight - getActionBarHeight();
float ratio = (float) Math.min(Math.max(scrollPosition, 0), headerHeight) / headerHeight;
int newAlpha = (int) (ratio * 255);
mActionBarBackgroundDrawable.setAlpha(newAlpha);
addParallaxEffect(scrollPosition);
}
private void addParallaxEffect(int scrollPosition) {
float damping = mUseParallax ? 0.5f : 1.0f;
int dampedScroll = (int) (scrollPosition * damping);
int offset = mLastDampedScroll - dampedScroll;
mHeaderContainer.offsetTopAndBottom(offset);
if (mListViewBackgroundView != null) {
offset = mLastScrollPosition - scrollPosition;
mListViewBackgroundView.offsetTopAndBottom(offset);
}
if (mFirstGlobalLayoutPerformed) {
mLastScrollPosition = scrollPosition;
mLastDampedScroll = dampedScroll;
}
}
private void updateHeaderHeight(int headerHeight) {
ViewGroup.LayoutParams params = (ViewGroup.LayoutParams) mMarginView.getLayoutParams();
params.height = headerHeight;
mMarginView.setLayoutParams(params);
if (mListViewBackgroundView != null) {
FrameLayout.LayoutParams params2 = (FrameLayout.LayoutParams) mListViewBackgroundView.getLayoutParams();
params2.topMargin = headerHeight;
mListViewBackgroundView.setLayoutParams(params2);
}
mLastHeaderHeight = headerHeight;
}
private void initializeGradient(ViewGroup headerContainer) {
View gradientView = headerContainer.findViewById(R.id.fab__gradient);
int gradient = R.drawable.fab__gradient;
if (mLightActionBar) {
gradient = R.drawable.fab__gradient_light;
}
gradientView.setBackgroundResource(gradient);
}
}
FadingActionBarHelper helper = new FadingActionBarHelper()
.actionBarBackground(color)
.headerLayout(headerLayout)
.contentLayout(mainLayout)
.onHeaderClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d(TAG, "clicked");
}
});
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