Android Open Source - muzei Draw Insets Frame Layout

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright 2014 Google Inc./*  w ww  . ja v  a 2  s . c o m*/
 *
 * 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.google.android.apps.muzei.util;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.WindowInsets;
import android.widget.FrameLayout;

import net.nurik.roman.muzei.R;

public class DrawInsetsFrameLayout extends FrameLayout {
    private Drawable mInsetBackground;
    private Drawable mTopInsetBackground;
    private Drawable mBottomInsetBackground;
    private Drawable mSideInsetBackground;

    private Rect mInsets;
    private Rect mTempRect = new Rect();
    private OnInsetsCallback mOnInsetsCallback;

    public DrawInsetsFrameLayout(Context context) {
        super(context);
        init(context, null, 0);
    }

    public DrawInsetsFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs, 0);
    }

    public DrawInsetsFrameLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs, defStyle);
    }

    private void init(Context context, AttributeSet attrs, int defStyle) {
        final TypedArray a = context.obtainStyledAttributes(attrs,
                R.styleable.DrawInsetsFrameLayout, defStyle, 0);
        assert a != null;

        mInsetBackground = a.getDrawable(R.styleable.DrawInsetsFrameLayout_insetBackground);
        mTopInsetBackground = a.getDrawable(R.styleable.DrawInsetsFrameLayout_topInsetBackground);
        mBottomInsetBackground =
                a.getDrawable(R.styleable.DrawInsetsFrameLayout_bottomInsetBackground);
        mSideInsetBackground = a.getDrawable(R.styleable.DrawInsetsFrameLayout_sideInsetBackground);

        a.recycle();
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (mInsetBackground != null) {
            mInsetBackground.setCallback(this);
        }
        if (mTopInsetBackground != null) {
            mTopInsetBackground.setCallback(this);
        }
        if (mBottomInsetBackground != null) {
            mBottomInsetBackground.setCallback(this);
        }
        if (mSideInsetBackground != null) {
            mSideInsetBackground.setCallback(this);
        }
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (mInsetBackground != null) {
            mInsetBackground.setCallback(null);
        }
        if (mTopInsetBackground != null) {
            mTopInsetBackground.setCallback(null);
        }
        if (mBottomInsetBackground != null) {
            mBottomInsetBackground.setCallback(null);
        }
        if (mSideInsetBackground != null) {
            mSideInsetBackground.setCallback(null);
        }
    }

    public void setOnInsetsCallback(OnInsetsCallback onInsetsCallback) {
        mOnInsetsCallback = onInsetsCallback;
    }

    @Override
    protected boolean fitSystemWindows(Rect insets) {
        mInsets = new Rect(insets);
        setWillNotDraw(false);
        postInvalidateOnAnimation();
        if (mOnInsetsCallback != null) {
            mOnInsetsCallback.onInsetsChanged(insets);
        }
        return true;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int width = getWidth();
        int height = getHeight();

        if (mInsets != null) {
            // Top
            mTempRect.set(0, 0, width, mInsets.top);
            if (mInsetBackground != null) {
                mInsetBackground.setBounds(mTempRect);
                mInsetBackground.draw(canvas);
            }
            if (mTopInsetBackground != null) {
                mTopInsetBackground.setBounds(mTempRect);
                mTopInsetBackground.draw(canvas);
            }

            // Bottom
            mTempRect.set(0, height - mInsets.bottom, width, height);
            if (mInsetBackground != null) {
                mInsetBackground.setBounds(mTempRect);
                mInsetBackground.draw(canvas);
            }
            if (mTopInsetBackground != null) {
                mBottomInsetBackground.setBounds(mTempRect);
                mBottomInsetBackground.draw(canvas);
            }

            // Left
            mTempRect.set(0, mInsets.top, mInsets.left, height - mInsets.bottom);
            if (mInsetBackground != null) {
                mInsetBackground.setBounds(mTempRect);
                mInsetBackground.draw(canvas);
            }
            if (mSideInsetBackground != null) {
                mSideInsetBackground.setBounds(mTempRect);
                mSideInsetBackground.draw(canvas);
            }

            // Right
            mTempRect.set(width - mInsets.right, mInsets.top, width, height - mInsets.bottom);
            if (mInsetBackground != null) {
                mInsetBackground.setBounds(mTempRect);
                mInsetBackground.draw(canvas);
            }
            if (mSideInsetBackground != null) {
                mSideInsetBackground.setBounds(mTempRect);
                mSideInsetBackground.draw(canvas);
            }
        }
    }

    public static interface OnInsetsCallback {
        public void onInsetsChanged(Rect insets);
    }
}
Java Source Code List
