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Custom drawn Android button which aligns left drawable and its text to center.
package com.webileapps.myrtprofile;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.Button;
/**
*
* @author Rajiv
*
* A Button which aligns its text and left drawable at center. Especially useful when we have buttons which don't wrap.
*
* usage:
*
* <com.webileapps.myrtprofile.DrawableAlignedButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableLeft="@drawable/plone"
android:gravity="center"
android:padding="7dp"
android:text="Text" />
*/
public class DrawableAlignedButton extends Button {
public DrawableAlignedButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
public DrawableAlignedButton(Context context) {
super(context);
}
public DrawableAlignedButton(Context context, AttributeSet attrs, int style) {
super(context, attrs, style);
}
private Drawable mLeftDrawable;
@Override
//Overriden to work only with a left drawable.
public void setCompoundDrawablesWithIntrinsicBounds(Drawable left,
Drawable top, Drawable right, Drawable bottom) {
if(left == null) return;
left.setBounds(0, 0, left.getIntrinsicWidth(), left.getIntrinsicHeight());
mLeftDrawable = left;
}
@Override
protected void onDraw(Canvas canvas) {
//transform the canvas so we can draw both image and text at center.
canvas.save();
canvas.translate(2+mLeftDrawable.getIntrinsicWidth()/2, 0);
super.onDraw(canvas);
canvas.restore();
canvas.save();
int widthOfText = (int)getPaint().measureText(getText().toString());
int left = (getWidth()+widthOfText)/2 - mLeftDrawable.getIntrinsicWidth() - 2;
canvas.translate(left, (getHeight()-mLeftDrawable.getIntrinsicHeight())/2);
mLeftDrawable.draw(canvas);
canvas.restore();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int height = getMeasuredHeight();
height = Math.max(height, mLeftDrawable.getIntrinsicHeight() + getPaddingTop() + getPaddingBottom());
setMeasuredDimension(getMeasuredWidth(), height);
}
}
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