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/*
* 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.annotation.NonNull;
import android.annotation.Px;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.text.Layout;
import android.text.Spanned;
/**
* A span which adds a drawable and a padding to the paragraph it's attached to.
* <p>
* If the height of the drawable is bigger than the height of the line it's attached to then the
* line height is increased to fit the drawable. <code>DrawableMarginSpan</code> allows setting a
* padding between the drawable and the text. The default value is 0. The span must be set from the
* beginning of the text, otherwise either the span won't be rendered or it will be rendered
* incorrectly.
* <p>
* For example, a drawable and a padding of 20px can be added like this:
* <pre>{@code SpannableString string = new SpannableString("Text with a drawable.");
* string.setSpan(new DrawableMarginSpan(drawable, 20), 0, string.length(),
* Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);}</pre>
* <img src="{@docRoot}reference/android/images/text/style/drawablemarginspan.png" />
* <figcaption>Text with a drawable and a padding.</figcaption>
* <p>
*
* @see IconMarginSpan for working with a {@link android.graphics.Bitmap} instead of
* a {@link Drawable}.
*/
public class DrawableMarginSpan implements LeadingMarginSpan, LineHeightSpan {
private static final int STANDARD_PAD_WIDTH = 0;
@NonNull
private final Drawable mDrawable;
@Px
private final int mPad;
/**
* Creates a {@link DrawableMarginSpan} from a {@link Drawable}. The pad width will be 0.
*
* @param drawable the drawable to be added
*/
public DrawableMarginSpan(@NonNull Drawable drawable) {
this(drawable, STANDARD_PAD_WIDTH);
}
/**
* Creates a {@link DrawableMarginSpan} from a {@link Drawable} and a padding, in pixels.
*
* @param drawable the drawable to be added
* @param pad the distance between the drawable and the text
*/
public DrawableMarginSpan(@NonNull Drawable drawable, int pad) {
mDrawable = drawable;
mPad = pad;
}
@Override
public int getLeadingMargin(boolean first) {
return mDrawable.getIntrinsicWidth() + mPad;
}
@Override
public void drawLeadingMargin(@NonNull Canvas c, @NonNull Paint p, int x, int dir,
int top, int baseline, int bottom,
@NonNull CharSequence text, int start, int end,
boolean first, @NonNull 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();
// XXX What to do about Paint?
mDrawable.setBounds(ix, itop, ix + dw, itop + dh);
mDrawable.draw(c);
}
@Override
public void chooseHeight(@NonNull CharSequence text, int start, int end,
int istartv, int v,
@NonNull 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;
}
}
}
}
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