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