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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.widget;
import org.mozilla.gecko.R;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.support.v4.content.ContextCompat;
import org.mozilla.gecko.widget.themed.ThemedImageView;
/* Special version of ImageView for thumbnails. Scales a thumbnail so that it maintains its aspect
* ratio and so that the images width and height are the same size or greater than the view size
*/
public class ThumbnailView extends ThemedImageView {
private static final String LOGTAG = "GeckoThumbnailView";
final private Matrix mMatrix;
private int mWidthSpec = -1;
private int mHeightSpec = -1;
private boolean mLayoutChanged;
private boolean mScale = false;
public ThumbnailView(Context context, AttributeSet attrs) {
super(context, attrs);
mMatrix = new Matrix();
mLayoutChanged = true;
}
@Override
public void onDraw(Canvas canvas) {
if (!mScale) {
super.onDraw(canvas);
return;
}
Drawable d = getDrawable();
if (mLayoutChanged) {
int w1 = d.getIntrinsicWidth();
int h1 = d.getIntrinsicHeight();
int w2 = getWidth();
int h2 = getHeight();
float scale = ((w2 / h2) < (w1 / h1)) ? (float) h2 / h1 : (float) w2 / w1;
mMatrix.setScale(scale, scale);
}
int saveCount = canvas.save();
canvas.concat(mMatrix);
d.draw(canvas);
canvas.restoreToCount(saveCount);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// OnLayout.changed isn't a reliable measure of whether or not the size of this view has changed
// neither is onSizeChanged called often enough. Instead, we track changes in size ourselves, and
// only invalidate this matrix if we have a new width/height spec
if (widthMeasureSpec != mWidthSpec || heightMeasureSpec != mHeightSpec) {
mWidthSpec = widthMeasureSpec;
mHeightSpec = heightMeasureSpec;
mLayoutChanged = true;
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
public void setImageDrawable(Drawable drawable) {
if (drawable == null) {
drawable = ContextCompat.getDrawable(getContext(), R.drawable.tab_panel_tab_background);
setScaleType(ScaleType.FIT_XY);
mScale = false;
} else {
mScale = true;
setScaleType(ScaleType.FIT_CENTER);
}
super.setImageDrawable(drawable);
}
}
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