Android example source code file (DrawableMarginSpan.java)

This example Android source code file (DrawableMarginSpan.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, charsequence, drawablemarginspan, drawing, graphics, layout, leadingmarginspan, lineheightspan, paint, spanned, text, ui

The DrawableMarginSpan.java Android example source code

/*
 * Copyright (C) 2006 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 android.text.style;

import android.graphics.drawable.Drawable;
import android.graphics.Paint;
import android.graphics.Canvas;
import android.graphics.RectF;
import android.text.Spanned;
import android.text.Layout;

public class DrawableMarginSpan
implements LeadingMarginSpan, LineHeightSpan
{
    public DrawableMarginSpan(Drawable b) {
        mDrawable = b;
    }

    public DrawableMarginSpan(Drawable b, int pad) {
        mDrawable = b;
        mPad = pad;
    }

    public int getLeadingMargin(boolean first) {
        return mDrawable.getIntrinsicWidth() + mPad;
    }

    public void drawLeadingMargin(Canvas c, Paint p, int x, int dir,
                                  int top, int baseline, int bottom,
                                  CharSequence text, int start, int end,
                                  boolean first, Layout layout) {
        int st = ((Spanned) text).getSpanStart(this);
        int ix = (int)x;
        int itop = (int)layout.getLineTop(layout.getLineForOffset(st));

        int dw = mDrawable.getIntrinsicWidth();
        int dh = mDrawable.getIntrinsicHeight();

        if (dir < 0)
            x -= dw;

        // XXX What to do about Paint?
        mDrawable.setBounds(ix, itop, ix+dw, itop+dh);
        mDrawable.draw(c);
    }

    public void chooseHeight(CharSequence text, int start, int end,
                             int istartv, int v,
                             Paint.FontMetricsInt fm) {
        if (end == ((Spanned) text).getSpanEnd(this)) {
            int ht = mDrawable.getIntrinsicHeight();

            int need = ht - (v + fm.descent - fm.ascent - istartv);
            if (need > 0)
                fm.descent += need;

            need = ht - (v + fm.bottom - fm.top - istartv);
            if (need > 0)
                fm.bottom += need;
        }
    }

    private Drawable mDrawable;
    private int mPad;
}