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| public class ColorTrackTextView extends TextView {
/**
* 默认的字体颜色的画笔
*/
private Paint mOriginPaint;
/**
* 改变的字体颜色的画笔
*/
private Paint mChangePaint;
/**
* 当前的进度
*/
private float mCurrentProgress = 0.6f;
/**
* 当前文本
*/
private String mText;
/**
* 当前朝向
*/
private Direction mDirection = Direction.DIRECTION_LEFT;
/**
* 绘制的朝向枚举
*/
public enum Direction {
/**
* 左边
*/
DIRECTION_LEFT,
/**
* 右边
*/
DIRECTION_RIGHT
}
public ColorTrackTextView(@NonNull Context context) {
super(context);
initPaint();
}
public ColorTrackTextView(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
initPaint();
}
public ColorTrackTextView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initPaint();
}
/**
* 初始化画笔
*/
private void initPaint() {
mOriginPaint = getPaintByColor(Color.BLACK);
mChangePaint = getPaintByColor(Color.RED);
}
/**
* 获取画笔根据不同的颜色
*/
private Paint getPaintByColor(int color) {
Paint paint = new Paint();
// 抗锯齿
paint.setAntiAlias(true);
// 仿抖动
paint.setDither(true);
paint.setColor(color);
// 字体的大小设置为TextView的文字大小
paint.setTextSize(getTextSize());
return paint;
}
/**
* 这里肯定是自己去画 不能用super
*/
@Override
protected void onDraw(Canvas canvas) {
// 获取当前文本
mText = getText().toString();
// 获取控件宽度
int width = getWidth();
if (!TextUtils.isEmpty(mText)) {
// 根据当前进度计算中间位置
int middle = (int) (width * mCurrentProgress);
// 根据不同的朝向去画字体
if (mDirection == Direction.DIRECTION_LEFT) {
drawOriginDirectionLeft(canvas, middle);
drawChangeDirectionLeft(canvas, middle);
}
if (mDirection == Direction.DIRECTION_RIGHT) {
drawOriginDirectionRight(canvas, middle);
drawChangeDirectionRight(canvas, middle);
}
}
}
/**
* 画朝向右边变色字体
*/
private void drawChangeDirectionRight(Canvas canvas, int middle) {
drawText(canvas, mChangePaint, getWidth() - middle, getWidth());
}
/**
* 画朝向左边默认色字体
*/
private void drawOriginDirectionRight(Canvas canvas, int middle) {
drawText(canvas, mOriginPaint, 0, getWidth() - middle);
}
/**
* 画朝向左边变色字体
*/
private void drawChangeDirectionLeft(Canvas canvas, int middle) {
drawText(canvas, mChangePaint, 0, middle);
}
/**
* 画朝向左边默认色字体
*/
private void drawOriginDirectionLeft(Canvas canvas, int middle) {
drawText(canvas, mOriginPaint, middle, getWidth());
}
/**
* 设置当前的进度
*
* @param currentProgress 当前进度
*/
public void setCurrentProgress(float currentProgress) {
this.mCurrentProgress = currentProgress;
// 重新绘制
invalidate();
}
/**
* 设置绘制方向，从右到左或者从左到右
*
* @param direction 绘制方向
*/
public void setDirection(Direction direction) {
this.mDirection = direction;
}
/**
* 绘制文本根据指定的位置
*
* @param canvas canvas画布
* @param paint 画笔
* @param startX 开始的位置
* @param endX 结束的位置
*/
private void drawText(Canvas canvas, Paint paint, int startX, int endX) {
// 保存画笔状态
canvas.save();
// 截取绘制的内容，待会就只会绘制clipRect设置的参数部分
canvas.clipRect(startX, 0, endX, getHeight());
// 获取文字的范围
Rect bounds = new Rect();
mOriginPaint.getTextBounds(mText, 0, mText.length(), bounds);
// 获取文字的Metrics 用来计算基线
Paint.FontMetricsInt fontMetrics = mOriginPaint.getFontMetricsInt();
// 获取文字的宽高
int fontTotalHeight = fontMetrics.bottom - fontMetrics.top;
// 计算基线到中心点的位置
int offY = fontTotalHeight / 2 - fontMetrics.bottom;
// 计算基线位置
int baseline = (getMeasuredHeight() + fontTotalHeight) / 2 - offY;
canvas.drawText(mText, getMeasuredWidth() / 2 - bounds.width() / 2, baseline, paint);
// 释放画笔状态
canvas.restore();
}
}
|
