138 lines
4.6 KiB
Java
138 lines
4.6 KiB
Java
/*
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* Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.ui.widget;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import android.widget.ImageView;
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import org.sufficientlysecure.keychain.R;
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/**
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* Maintains an aspect ratio based on either width or height. Disabled by default.
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*
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* from https://gist.github.com/JakeWharton/2856179
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*/
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public class AspectRatioImageView extends ImageView {
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// NOTE: These must be kept in sync with the AspectRatioImageView attributes in attrs.xml.
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public static final int MEASUREMENT_WIDTH = 0;
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public static final int MEASUREMENT_HEIGHT = 1;
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private static final float DEFAULT_ASPECT_RATIO = 1f;
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private static final boolean DEFAULT_ASPECT_RATIO_ENABLED = false;
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private static final int DEFAULT_DOMINANT_MEASUREMENT = MEASUREMENT_WIDTH;
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private float aspectRatio;
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private boolean aspectRatioEnabled;
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private int dominantMeasurement;
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public AspectRatioImageView(Context context) {
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this(context, null);
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}
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public AspectRatioImageView(Context context, AttributeSet attrs) {
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super(context, attrs);
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AspectRatioImageView);
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aspectRatio = a.getFloat(R.styleable.AspectRatioImageView_aspectRatio, DEFAULT_ASPECT_RATIO);
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aspectRatioEnabled = a.getBoolean(R.styleable.AspectRatioImageView_aspectRatioEnabled,
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DEFAULT_ASPECT_RATIO_ENABLED);
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dominantMeasurement = a.getInt(R.styleable.AspectRatioImageView_dominantMeasurement,
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DEFAULT_DOMINANT_MEASUREMENT);
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a.recycle();
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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if (!aspectRatioEnabled) return;
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int newWidth;
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int newHeight;
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switch (dominantMeasurement) {
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case MEASUREMENT_WIDTH:
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newWidth = getMeasuredWidth();
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newHeight = (int) (newWidth * aspectRatio);
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break;
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case MEASUREMENT_HEIGHT:
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newHeight = getMeasuredHeight();
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newWidth = (int) (newHeight * aspectRatio);
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break;
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default:
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throw new IllegalStateException("Unknown measurement with ID " + dominantMeasurement);
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}
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setMeasuredDimension(newWidth, newHeight);
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}
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/**
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* Get the aspect ratio for this image view.
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*/
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public float getAspectRatio() {
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return aspectRatio;
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}
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/**
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* Set the aspect ratio for this image view. This will update the view instantly.
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*/
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public void setAspectRatio(float aspectRatio) {
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this.aspectRatio = aspectRatio;
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if (aspectRatioEnabled) {
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requestLayout();
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}
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}
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/**
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* Get whether or not forcing the aspect ratio is enabled.
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*/
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public boolean getAspectRatioEnabled() {
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return aspectRatioEnabled;
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}
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/**
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* set whether or not forcing the aspect ratio is enabled. This will re-layout the view.
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*/
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public void setAspectRatioEnabled(boolean aspectRatioEnabled) {
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this.aspectRatioEnabled = aspectRatioEnabled;
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requestLayout();
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}
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/**
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* Get the dominant measurement for the aspect ratio.
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*/
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public int getDominantMeasurement() {
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return dominantMeasurement;
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}
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/**
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* Set the dominant measurement for the aspect ratio.
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*
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* @see #MEASUREMENT_WIDTH
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* @see #MEASUREMENT_HEIGHT
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*/
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public void setDominantMeasurement(int dominantMeasurement) {
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if (dominantMeasurement != MEASUREMENT_HEIGHT && dominantMeasurement != MEASUREMENT_WIDTH) {
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throw new IllegalArgumentException("Invalid measurement type.");
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}
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this.dominantMeasurement = dominantMeasurement;
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requestLayout();
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}
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} |