/*
* Copyright 2015 Hippo Seven
*
* 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.hippo.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import com.hippo.nimingban.R;
import com.hippo.yorozuya.MathUtils;
/**
* aspect is width / height
*/
public class FixedAspectImageView extends ImageView {
private static final String TAG = FixedAspectImageView.class.getSimpleName();
private static final int[] MIN_ATTRS = {
android.R.attr.minWidth,
android.R.attr.minHeight
};
private static final int[] ATTRS = {
android.R.attr.adjustViewBounds,
android.R.attr.maxWidth,
android.R.attr.maxHeight
};
private int mMinWidth = 0;
private int mMinHeight = 0;
private int mMaxWidth = Integer.MAX_VALUE;
private int mMaxHeight = Integer.MAX_VALUE;
private boolean mAdjustViewBounds = false;
private float mAspect = -1f;
public FixedAspectImageView(Context context) {
super(context);
}
public FixedAspectImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
@SuppressWarnings("ResourceType")
public FixedAspectImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a;
// Make sure we get value from xml
a = context.obtainStyledAttributes(attrs, MIN_ATTRS, defStyle, 0);
setMinimumWidth(a.getDimensionPixelSize(0, 0));
setMinimumHeight(a.getDimensionPixelSize(1, 0));
a.recycle();
a = context.obtainStyledAttributes(attrs, ATTRS, defStyle, 0);
setAdjustViewBounds(a.getBoolean(0, false));
setMaxWidth(a.getDimensionPixelSize(1, Integer.MAX_VALUE));
setMaxHeight(a.getDimensionPixelSize(2, Integer.MAX_VALUE));
a.recycle();
a = context.obtainStyledAttributes(
attrs, R.styleable.FixedAspectImageView, defStyle, 0);
setAspect(a.getFloat(R.styleable.FixedAspectImageView_aspect, -1f));
a.recycle();
}
@Override
public void setMinimumWidth(int minWidth) {
super.setMinimumWidth(minWidth);
mMinWidth = minWidth;
}
@Override
public void setMinimumHeight(int minHeight) {
super.setMinimumHeight(minHeight);
mMinHeight = minHeight;
}
@Override
public void setMaxWidth(int maxWidth) {
super.setMaxWidth(maxWidth);
mMaxWidth = maxWidth;
}
@Override
public void setMaxHeight(int maxHeight) {
super.setMaxHeight(maxHeight);
mMaxHeight = maxHeight;
}
@Override
public void setAdjustViewBounds(boolean adjustViewBounds) {
super.setAdjustViewBounds(adjustViewBounds);
mAdjustViewBounds = adjustViewBounds;
}
/**
* Enable aspect will set AdjustViewBounds true.
* Any negative float to disable it,
* disable Aspect will not disable AdjustViewBounds.
*
* @param ratio width/height
*/
public void setAspect(float ratio) {
if (ratio > 0) {
mAspect = ratio;
setAdjustViewBounds(true);
} else {
mAspect = -1f;
}
requestLayout();
}
private int resolveAdjustedSize(int desiredSize, int minSize, int maxSize,
int measureSpec) {
int result = desiredSize;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
switch (specMode) {
case MeasureSpec.UNSPECIFIED:
// Parent says we can be as big as we want. Just don't be smaller
// than min size, and don't be larger than max size.
result = MathUtils.clamp(desiredSize, minSize, maxSize);
break;
case MeasureSpec.AT_MOST:
// Parent says we can be as big as we want, up to specSize.
// Don't be larger than specSize, and don't be smaller
// than min size, and don't be larger than max size.
result = Math.min(MathUtils.clamp(desiredSize, minSize, maxSize), specSize);
break;
case MeasureSpec.EXACTLY:
// No choice. Do what we are told.
result = specSize;
break;
}
return result;
}
private boolean isSizeAcceptable(int size, int minSize, int maxSize, int measureSpec) {
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
switch (specMode) {
case MeasureSpec.UNSPECIFIED:
// Parent says we can be as big as we want. Just don't be smaller
// than min size, and don't be larger than max size.
return size >= minSize && size <= maxSize;
case MeasureSpec.AT_MOST:
// Parent says we can be as big as we want, up to specSize.
// Don't be larger than specSize, and don't be smaller
// than min size, and don't be larger than max size.
return size <= specSize && size >= minSize && size <= maxSize;
case MeasureSpec.EXACTLY:
// No choice.
return size == specSize;
default:
// WTF? Return true to make you happy. (´・ω・`)
return true;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int w;
int h;
// Desired aspect ratio of the view's contents (not including padding)
float desiredAspect = 0.0f;
// We are allowed to change the view's width
boolean resizeWidth = false;
// We are allowed to change the view's height
boolean resizeHeight = false;
final int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
final int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
Drawable drawable = getDrawable();
if (drawable == null) {
// If no drawable, its intrinsic size is 0.
w = h = 0;
if (mAdjustViewBounds && mAspect > 0.0f) {
resizeWidth = widthSpecMode != MeasureSpec.EXACTLY;
resizeHeight = heightSpecMode != MeasureSpec.EXACTLY;
desiredAspect = mAspect;
}
} else {
w = drawable.getIntrinsicWidth();
h = drawable.getIntrinsicHeight();
if (w <= 0) w = 1;
if (h <= 0) h = 1;
// We are supposed to adjust view bounds to match the aspect
// ratio of our drawable. See if that is possible.
if (mAdjustViewBounds) {
resizeWidth = widthSpecMode != MeasureSpec.EXACTLY;
resizeHeight = heightSpecMode != MeasureSpec.EXACTLY;
desiredAspect = mAspect <= 0.0f ? ((float) w / (float) h) : mAspect;
}
}
int pleft = getPaddingLeft();
int pright = getPaddingRight();
int ptop = getPaddingTop();
int pbottom = getPaddingBottom();
int widthSize;
int heightSize;
if (resizeWidth || resizeHeight) {
// If we get here, it means we want to resize to match the
// drawables aspect ratio, and we have the freedom to change at
// least one dimension.
// Get the max possible width given our constraints
widthSize = resolveAdjustedSize(w + pleft + pright, mMinWidth, mMaxWidth, widthMeasureSpec);
// Get the max possible height given our constraints
heightSize = resolveAdjustedSize(h + ptop + pbottom, mMinHeight, mMaxHeight, heightMeasureSpec);
if (desiredAspect != 0.0f) {
// See what our actual aspect ratio is
float actualAspect = (float)(widthSize - pleft - pright) /
(heightSize - ptop - pbottom);
if (Math.abs(actualAspect - desiredAspect) > 0.0000001) {
boolean done = false;
// Try adjusting width to be proportional to height
if (resizeWidth) {
int newWidth = (int)(desiredAspect * (heightSize - ptop - pbottom)) +
pleft + pright;
// Allow the width to outgrow its original estimate if height is fixed.
//if (!resizeHeight) {
//widthSize = resolveAdjustedSize(newWidth, mMinWidth, mMaxWidth, widthMeasureSpec);
//}
if (isSizeAcceptable(newWidth, mMinWidth, mMaxWidth, widthMeasureSpec)) {
widthSize = newWidth;
done = true;
}
}
// Try adjusting height to be proportional to width
if (!done && resizeHeight) {
int newHeight = (int)((widthSize - pleft - pright) / desiredAspect) +
ptop + pbottom;
// Allow the height to outgrow its original estimate if width is fixed.
if (!resizeWidth) {
heightSize = resolveAdjustedSize(newHeight, mMinHeight, mMaxHeight,
heightMeasureSpec);
}
if (isSizeAcceptable(newHeight, mMinHeight, mMaxHeight, heightMeasureSpec)) {
heightSize = newHeight;
}
}
}
}
} else {
// We are either don't want to preserve the drawables aspect ratio,
// or we are not allowed to change view dimensions. Just measure in
// the normal way.
w += pleft + pright;
h += ptop + pbottom;
w = Math.max(w, getSuggestedMinimumWidth());
h = Math.max(h, getSuggestedMinimumHeight());
widthSize = View.resolveSizeAndState(w, widthMeasureSpec, 0);
heightSize = View.resolveSizeAndState(h, heightMeasureSpec, 0);
}
setMeasuredDimension(widthSize, heightSize);
}
}