com.libs.drawerlayouttoggles.ContentDisplaceDrawerToggle.java Source code

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Here is the source code for com.libs.drawerlayouttoggles.ContentDisplaceDrawerToggle.java

Source

package com.libs.drawerlayouttoggles;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.res.Configuration;
import android.os.Build;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.View.MeasureSpec;

import com.nineoldandroids.view.ViewHelper;

/* Author: Nikola Despotoski
 * Email: nikola[dot]despotoski(at)gmail[dot]com
 * 
 *   Copyright (c) 2012 Nikola Despotoski
    
   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.
 */
public class ContentDisplaceDrawerToggle implements DrawerToggle {

    private Activity mActivity;
    private View mContentView;
    private float mMinusShadow;
    private DrawerLayout mDrawerLayout;
    private int mGravity;
    private int mScreenWidth;

    public ContentDisplaceDrawerToggle(Activity a, DrawerLayout d, int containerResId, int gravity) {
        mActivity = a;
        mContentView = getContentView();
        mDrawerLayout = d;
        setContentContainer(containerResId);
        mScreenWidth = ScreenUtils.getScreenWidth(a);
        mGravity = gravity;
    }

    public ContentDisplaceDrawerToggle(Activity a, DrawerLayout d, View containerView, int gravity) {
        mActivity = a;
        mContentView = getContentView();
        mDrawerLayout = d;
        setContentContainer(containerView);
        mScreenWidth = ScreenUtils.getScreenWidth(a);
        mGravity = gravity;
    }

    public void setContentContainer(View v) {
        mContentView = v;
    }

    public void setDrawerLayoutGravity(int gravity) {
        mGravity = gravity;
    }

    public void setContentContainer(int resId) {
        setContentContainer(mContentView.findViewById(resId));
    }

    public void setDrawerLayout(DrawerLayout dl) {
        this.mDrawerLayout = dl;
    }

    public void syncState() {
        mDrawerLayout.measure(MeasureSpec.EXACTLY, MeasureSpec.EXACTLY);
        this.onDrawerSlide(mDrawerLayout, isOpen() ? 1.0f : 0.0f);

    }

    @SuppressLint("NewApi")
    private void updateContentMoved(float translationX) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            mContentView.setTranslationX(translationX);
            mContentView.setX(mContentView.getTranslationX());
        } else {
            ViewHelper.setTranslationX(mContentView, translationX);
            ViewHelper.setX(mContentView, translationX);
        }

    }

    @Override
    public void onDrawerClosed(View arg0) {

    }

    @Override
    public void onDrawerOpened(View arg0) {

    }

    @Override
    public void onDrawerSlide(View drawerView, float slideOffset) {
        getDrawerMinusShadow();
        float translationX = mMinusShadow * slideOffset;
        translationX = mGravity == GravityCompat.START || mGravity == Gravity.RIGHT ? translationX
                : mScreenWidth - translationX;
        updateContentMoved(translationX);

    }

    @Override
    public void onDrawerStateChanged(int arg0) {
        // TODO Auto-generated method stub

    }

    private void getDrawerMinusShadow() {
        if (mMinusShadow == 0.0f) {
            for (int i = 0; i < mDrawerLayout.getChildCount(); i++) {
                mMinusShadow = mMinusShadow == 0.0f ? mDrawerLayout.getChildAt(i).getMeasuredWidth() : mMinusShadow;
                mMinusShadow = Math.min(mMinusShadow, mDrawerLayout.getChildAt(i).getMeasuredWidth());
            }

        }
        return;
    }

    private View getContentView() {
        return mActivity.findViewById(android.R.id.content);
    }

    private boolean isOpen() {
        return mDrawerLayout.isDrawerOpen(mGravity);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (isOpen()) {
            mDrawerLayout.closeDrawer(mGravity);
        }
        return false;
    }

    @Override
    public void onConfigurationChanged(Configuration config) {
        syncState();

    }

    @Override
    public void release() {
        updateContentMoved(0f);//restore to original state 
    }

}