Android实现一个可拖拽带有坐标尺的进度条

overridefunonMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec)
valheightMode=MeasureSpec.getMode(heightMeasureSpec)
varwindowHeight=heightMeasureSpecif (heightMode==MeasureSpec.AT_MOST) {
windowHeight=mDefaultHeight.toInt()//默认的高度        }
setMeasuredDimension(widthMeasureSpec, windowHeight)
    }

onTouchEvent(event: MotionEvent?): Boolean {
super.onTouchEvent(event)
//如果为true直接返回，不进行拖拽if (mProgressIsIntercept) {
returnmProgressIsIntercept        }
when (event?.action) {
MotionEvent.ACTION_DOWN-> {
parent.requestDisallowInterceptTouchEvent(mDisallowIntercept)
valdownX=getChangeX(event.x)
valstartX=mMoveOldX-mProgressMarginLeftRightvalendX=mMoveOldX+mProgressMarginLeftRightreturndownXinstartX..endX            }
MotionEvent.ACTION_MOVE-> {
//移动varmoveX=getChangeX(event.x)
//滑动至最右边//计算最后边的坐标valviewWidth=getViewWidth()
if (moveX>=viewWidth) {
moveX=viewWidth                }
mMoveProgress=moveXinvalidate()
            }
MotionEvent.ACTION_UP-> {
//手指谈起mMoveOldX=getChangeX(event.x)
valviewWidth=getViewWidth()
if (mMoveOldX>=viewWidth) {
mMoveOldX=viewWidth                }
            }
        }
returntrue    }

/*** AUTHOR:AbnerMing* INTRODUCE:绘制背景*/privatefuncanvasBackground(canvas: Canvas) {
mPaint!!.color=mProgressBackgroundvalrect=RectF().apply {
left=mProgressMarginLeftRighttop=mProgressMarginTopBottomright=width.toFloat() -mProgressMarginLeftRightbottom=mProgressHeight+mProgressMarginTopBottom        }
canvas.drawRoundRect(rect, mProgressRadius, mProgressRadius, mPaint!!)
    }

/*** AUTHOR:AbnerMing* INTRODUCE:绘制离散间隔*/privatefuncanvasIntervalLine(canvas: Canvas, isCanvas: Boolean) {
valrect=            (width-mProgressMarginLeftRight*2-mIntervalParentLeftRight*2) /mIntervalSizeif (isCanvas) {
mPaint!!.color=mIntervalSelectColor        } else {
mPaint!!.color=mIntervalColor        }
mPaint!!.strokeWidth=mIntervalWidthfor (ain0..mIntervalSize) {
valx= (rect*a) +mProgressMarginLeftRight+mIntervalParentLeftRightvaly=mIntervalMarginTopBottom+mProgressMarginTopBottomcanvas.drawLine(
x,
y,
x,
mProgressHeight+mProgressMarginTopBottom-mIntervalMarginTopBottom,
mPaint!!            )
        }
    }

/*** AUTHOR:AbnerMing* INTRODUCE:绘制移动的图标*/privatefuncanvasMoveIcon(canvas: Canvas) {
mProgressThumb?.let {
vardecodeResource=BitmapFactory.decodeResource(resources, it)
mProgressThumbWidth=decodeResource.widthif (mThumbWidth!=0f) {
valheight: Int=decodeResource.height// 设置想要的大小valnewWidth=mThumbWidthvalnewHeight=mThumbHeight// 计算缩放比例valscaleWidth=newWidth/widthvalscaleHeight=newHeight/height// 取得想要缩放的matrix参数valmatrix=Matrix()
matrix.postScale(scaleWidth, scaleHeight)
// 得到新的图片decodeResource=Bitmap.createBitmap(decodeResource, 0, 0, width, height, matrix, true)
            }
varmThumpLeft=mMoveProgressif (mThumpLeft< (mProgressThumbWidth/2-mIntervalParentLeftRight+mProgressThumbSpacing)) {
mThumpLeft=mProgressThumbWidth/2-mIntervalParentLeftRight+mProgressThumbSpacing            }
if (mThumpLeft> (getViewWidth() -mIntervalParentLeftRight+mProgressThumbSpacing)) {
mThumpLeft=getViewWidth() -mIntervalParentLeftRight+mProgressThumbSpacing            }
canvas.drawBitmap(
decodeResource, mThumpLeft, mThumbMarginTop, mIconPaint!!            )
        }
    }

/*** AUTHOR:AbnerMing* INTRODUCE:绘制进度*/privatefuncanvasMoveProgress(canvas: Canvas) {
//为空if (mColorArray.isEmpty()) {
mColorArray=intArrayOf(
ContextCompat.getColor(context, R.color.text_ff3e3e93),
ContextCompat.getColor(context, R.color.text_ff8548d2),
            )
        }
vallinearShader=LinearGradient(
0f,
0f,
mMoveProgress+mProgressMarginLeftRight,
mProgressHeight,
mColorArray,
floatArrayOf(0f, 1f),
Shader.TileMode.CLAMP        )
mProgressPaint!!.shader=linearShader//等于0时valrect=RectF()
rect.left=mProgressMarginLeftRightrect.top=mProgressMarginTopBottomrect.right=mMoveProgress+mProgressMarginLeftRightrect.bottom=mProgressHeight+mProgressMarginTopBottomcanvas.drawRoundRect(rect, mProgressRadius, mProgressRadius, mProgressPaint!!)
//计算比例mGraduationResult=            ((mMoveProgress/getViewWidth()) *mMaxProgress).roundToInt()//(endProgress * mMaxProgress).roundToInt()if (mGraduationResult<1) {
mGraduationResult=if (mGraduationSectionZero) {
0            } else {
1            }
        }
if (mGraduationResult>=mMaxProgress) {
mGraduationResult=mMaxProgress        }
mMoveProgressCallback?.invoke(mGraduationResult)
    }

/*** AUTHOR:AbnerMing* INTRODUCE:绘制离散间隔*/privatefuncanvasIntervalLine(canvas: Canvas, isCanvas: Boolean) {
valrect=            (width-mProgressMarginLeftRight*2-mIntervalParentLeftRight*2) /mIntervalSizeif (isCanvas) {
mPaint!!.color=mIntervalSelectColor        } else {
mPaint!!.color=mIntervalColor        }
mPaint!!.strokeWidth=mIntervalWidthfor (ain0..mIntervalSize) {
valx= (rect*a) +mProgressMarginLeftRight+mIntervalParentLeftRightvaly=mIntervalMarginTopBottom+mProgressMarginTopBottomcanvas.drawLine(
x,
y,
x,
mProgressHeight+mProgressMarginTopBottom-mIntervalMarginTopBottom,
mPaint!!            )
//绘制刻度值if (mIsGraduation&&isCanvas) {
if (mHideGraduationSectionCenter&& (a!=0&&a!=mIntervalSize)) {
//隐藏中间continue                }
vargraduation=a*mGraduationSection//是否从0开始记录if (graduation==0&&!mGraduationSectionZero) {
graduation=1                }
//如果移动到了，改变颜色if (mGraduationResult>=graduation&&mGraduationResult<graduation+mGraduationSection) {
mGraduationPaint?.color=mGraduationSelectTextColor                } else {
mGraduationPaint?.color=mGraduationTextColor                }
valtext=graduation.toString()
valrectText=Rect()
mGraduationPaint!!.getTextBounds(text, 0, text.length, rectText)
valtextWidth=rectText.width()
valtextHeight=rectText.height()
canvas.drawText(
text,
x-textWidth/2,
mProgressHeight+mProgressMarginTopBottom*2+textHeight+mGraduationMarginTop,
mGraduationPaint!!                )
            }
        }
    }