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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.android.gallery3d.filtershow.ui;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.Button;
import com.android.gallery3d.R;
/**
* Class of buttons with both an image icon and text.
*/
public class IconButton extends Button {
protected Bitmap mImageMirror = null;
protected Bitmap mIcon = null;
protected boolean stale_icon = true;
public IconButton(Context context) {
this(context, null);
}
public IconButton(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public IconButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
BitmapDrawable ic = (BitmapDrawable) getCompoundDrawables()[1];
if (ic != null) {
mImageMirror = ic.getBitmap();
}
}
/**
* Set the image that the button icon will use.
*
* @param image image that icon will be set to before next draw.
*/
public void setIcon(Bitmap image) {
mImageMirror = image;
stale_icon = true;
invalidate();
}
/**
* Creates and sets button icon. Only call after layout.
*
* @param image bitmap to use as icon
*/
protected boolean makeAndSetIcon(Bitmap image) {
int size = getGoodIconSideSize();
if (size > 0) {
return setImageIcon(makeImageIcon(image, size, size));
}
return false;
}
/**
* Sets icon.
*
* @param image bitmap to set the icon to.
*/
protected boolean setImageIcon(Bitmap image) {
if (image == null) {
return false;
}
mIcon = image;
this.setCompoundDrawablesWithIntrinsicBounds(null,
new BitmapDrawable(getResources(), mIcon), null, null);
return true;
}
/**
* Generate an icon bitmap from a given bitmap.
*
* @param image bitmap to use as button icon
* @param width icon width
* @param height icon height
* @return the scaled/cropped icon bitmap
*/
protected Bitmap makeImageIcon(Bitmap image, int width, int height) {
Rect destination = new Rect(0, 0, width, height);
Bitmap bmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bmap = drawImage(bmap, image, destination);
return bmap;
}
/**
* Finds a side length for the (square) icon that fits within the button.
* Only call after layout.
*
* @return icon side length
*/
protected int getGoodIconSideSize() {
Paint p = getPaint();
Rect bounds = new Rect();
String s = getText().toString();
p.getTextBounds(s, 0, s.length(), bounds);
int inner_padding = 2 * getCompoundDrawablePadding();
int vert = getHeight() - getPaddingTop() - getPaddingBottom() - bounds.height()
- inner_padding;
int horiz = getWidth() - getPaddingLeft() - getPaddingRight() - inner_padding;
return Math.min(vert, horiz);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
stale_icon = true;
}
@Override
protected void onDraw(Canvas canvas) {
if (stale_icon && mImageMirror != null && mImageMirror.getHeight() > 0
&& mImageMirror.getWidth() > 0) {
stale_icon = !makeAndSetIcon(mImageMirror);
}
super.onDraw(canvas);
}
// Override this for custom icon generation
protected Bitmap drawImage(Bitmap dst, Bitmap image, Rect destination) {
if (image != null) {
Canvas canvas = new Canvas(dst);
int iw = image.getWidth();
int ih = image.getHeight();
int x = 0;
int y = 0;
int size = 0;
Rect source = null;
if (iw > ih) {
size = ih;
x = (int) ((iw - size) / 2.0f);
y = 0;
} else {
size = iw;
x = 0;
y = (int) ((ih - size) / 2.0f);
}
source = new Rect(x, y, x + size, y + size);
canvas.drawBitmap(image, source, destination, new Paint());
}
return dst;
}
}
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