|
package
com.phodev.andtools.widget;
import
android.content.Context;
import
android.graphics.Canvas;
import
android.graphics.Paint;
import
android.graphics.Paint.FontMetrics;
import
android.graphics.Path;
import
android.graphics.Region.Op;
import
android.text.Layout;
import
android.util.AttributeSet;
import
android.widget.TextView;
/**
*
透明间距的TextView
*
*
@author skg
*
*/
public
class
AlphaLineSpaceTextView extends
TextView {
//
as thin as possible
private
boolean
thinStyle = false;
public
AlphaLineSpaceTextView(Context context, AttributeSet attrs,
int
defStyle) {
super(context,
attrs, defStyle);
}
public
AlphaLineSpaceTextView(Context context, AttributeSet attrs) {
super(context,
attrs);
}
public
AlphaLineSpaceTextView(Context context) {
super(context);
}
private
final
Path path = new
Path();
@Override
public
void
draw(Canvas canvas) {
Layout
layout = getLayout();
if
(layout == null)
{
super.draw(canvas);
return;
}
Paint
paint = layout.getPaint();
float
spacingAdd = layout.getSpacingAdd();
if
(spacingAdd > 0
&& paint != null)
{
int
linesCount = getLineCount();
int
maxWith = getWidth();
int
saveCount = canvas.save();
FontMetrics
fm = paint.getFontMetrics();
int
descent = (int)
(fm.descent + 0.5f);
int
topOffset;
int
bottomOffset;
path.reset();
if
(thinStyle) {
//
clip first line top
path.moveTo(0,
0);
path.lineTo(maxWith,
0);
path.lineTo(maxWith,
descent);
path.lineTo(0,
descent);
path.close();
try
{
canvas.clipPath(path,
Op.DIFFERENCE);
}
catch
(Exception e) {
}
//
topOffset
= -descent;
bottomOffset
= 0;
}
else
{
topOffset
= -descent - 2;
bottomOffset
= 0;
}
//
clip every line bottom
for
(int
i = 0;
i < linesCount; i++) {
int
top = layout.getLineBaseline(i) - topOffset;
int
bottom = layout.getLineBottom(i) - bottomOffset;
/*
*
Log.d("ttt", "---- baseline:" + layout.getLineBaseline(i) +
*
" bottom:" + layout.getLineBottom(i) + "descent:" + descent);
*/
path.reset();
path.moveTo(0,
top);
path.lineTo(maxWith,
top);
path.lineTo(maxWith,
bottom);
path.lineTo(0,
bottom);
path.close();
try
{
canvas.clipPath(path,
Op.DIFFERENCE);
}
catch
(Exception e) {
}
}
//
super.draw(canvas);
canvas.restoreToCount(saveCount);
return;
}
super.draw(canvas);
}
}
|
