me.henrytao.mdcore.widgets.internal.MdCheckBox.java Source code

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Here is the source code for me.henrytao.mdcore.widgets.internal.MdCheckBox.java

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/*
 * Copyright 2016 "Henry Tao <hi@henrytao.me>"
 *
 * 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 me.henrytao.mdcore.widgets.internal;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.AppCompatCheckBox;
import android.support.v7.widget.ViewUtils;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;

import me.henrytao.mdcore.R;
import me.henrytao.mdcore.utils.Typography;

/**
 * Created by henrytao on 5/3/16.
 */
public class MdCheckBox extends AppCompatCheckBox {

    private static int getDefStyleAttr(Context context, AttributeSet attrs) {
        return hasCustomDrawable(context, attrs) ? R.attr.MdIconToggleStyle : R.attr.MdCheckBoxStyle;
    }

    private static boolean hasCustomDrawable(Context context, AttributeSet attrs) {
        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, new int[] { R.attr.srcCompat }, 0, 0);
        boolean result = a.getResourceId(0, 0) > 0;
        a.recycle();
        return result;
    }

    private int mDrawablePadding;

    private boolean mHasCustomDrawable;

    private int mMinWidth;

    private int mPaddingBottom;

    private int mPaddingLeft;

    private int mPaddingRight;

    private int mPaddingTop;

    public MdCheckBox(Context context) {
        this(context, null);
    }

    public MdCheckBox(Context context, AttributeSet attrs) {
        this(context, attrs, getDefStyleAttr(context, attrs));
    }

    public MdCheckBox(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr > 0 ? defStyleAttr : getDefStyleAttr(context, attrs));
        initFromAttributes(attrs, defStyleAttr > 0 ? defStyleAttr : getDefStyleAttr(context, attrs));
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (isLayoutRtl()) {
            canvas.translate(-mPaddingRight, 0);
        } else {
            canvas.translate(mPaddingLeft, 0);
        }
        super.onDraw(canvas);
        Drawable background = getBackground();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && background != null) {
            boolean isLayoutRtl = isLayoutRtl();
            Rect bounds = background.getBounds();
            int top = bounds.top;
            int bottom = bounds.bottom;
            int left = (isLayoutRtl ? getWidth() - mMinWidth : 0)
                    + (!mHasCustomDrawable && !isLayoutRtl ? mPaddingLeft : 0);
            int right = (isLayoutRtl ? getWidth() : mMinWidth)
                    - (!mHasCustomDrawable && isLayoutRtl ? mPaddingRight : 0);
            background.setHotspotBounds(left, top, right, bottom);
        }
    }

    protected void initFromAttributes(AttributeSet attrs, int defStyleAttr) {
        Typeface typeface = Typography.getTypeface(getContext(), attrs, defStyleAttr, 0);
        if (typeface != null) {
            setTypeface(typeface);
        }

        mHasCustomDrawable = hasCustomDrawable(getContext(), attrs);

        mPaddingLeft = getPaddingLeft();
        mPaddingTop = getPaddingTop();
        mPaddingRight = getPaddingRight();
        mPaddingBottom = getPaddingBottom();
        mDrawablePadding = getCompoundDrawablePadding();
        mMinWidth = ViewCompat.getMinimumWidth(this);

        invalidatePadding();
        addTextChangedListener(new TextWatcher() {
            @Override
            public void afterTextChanged(Editable s) {
                invalidatePadding();
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }
        });
    }

    private void invalidatePadding() {
        int adjustedLeft = TextUtils.isEmpty(getText()) ? 0 : mDrawablePadding;
        int adjustedRight = mPaddingLeft + mPaddingRight;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            setPaddingRelative(adjustedLeft, mPaddingTop, adjustedRight, mPaddingBottom);
        } else {
            setPadding(adjustedLeft, mPaddingTop, adjustedRight, mPaddingBottom);
        }
    }

    private boolean isLayoutRtl() {
        return ViewUtils.isLayoutRtl(this);
    }
}