kunfei
5 years ago
commit
a54ce37738
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package io.legado.app.ui.widget; |
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|
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import android.content.Context; |
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import android.content.res.TypedArray; |
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import android.graphics.Canvas; |
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import android.graphics.Color; |
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import android.graphics.Paint; |
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import android.graphics.Path; |
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import android.graphics.Rect; |
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import android.util.AttributeSet; |
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import android.view.View; |
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import io.legado.app.R; |
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import androidx.annotation.Nullable; |
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public class ArcView extends View { |
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private int mWidth; |
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private int mHeight; |
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/** |
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* 弧形高度 |
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*/ |
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private int mArcHeight; |
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/** |
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* 背景颜色 |
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*/ |
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private int mBgColor; |
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private Paint mPaint; |
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private boolean mDirectionTop; |
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private Context mContext; |
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public ArcView(Context context) { |
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this(context, null); |
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} |
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public ArcView(Context context, @Nullable AttributeSet attrs) { |
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this(context, attrs, 0); |
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} |
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public ArcView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { |
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super(context, attrs, defStyleAttr); |
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TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ArcView); |
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mArcHeight = typedArray.getDimensionPixelSize(R.styleable.ArcView_arcHeight, 0); |
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mBgColor = typedArray.getColor(R.styleable.ArcView_bgColor, Color.parseColor("#303F9F")); |
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mDirectionTop = typedArray.getBoolean(R.styleable.ArcView_arcDirectionTop, false); |
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mContext = context; |
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mPaint = new Paint(); |
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} |
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@Override |
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protected void onDraw(Canvas canvas) { |
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super.onDraw(canvas); |
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mPaint.setStyle(Paint.Style.FILL); |
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mPaint.setColor(mBgColor); |
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if (mDirectionTop) { |
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Rect rect = new Rect(0, mArcHeight, mWidth, mHeight); |
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canvas.drawRect(rect, mPaint); |
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Path path = new Path(); |
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path.moveTo(0, mArcHeight); |
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path.quadTo(mWidth / 2, 0, mWidth, mArcHeight); |
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canvas.drawPath(path, mPaint); |
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} else { |
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Rect rect = new Rect(0, 0, mWidth, mHeight - mArcHeight); |
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canvas.drawRect(rect, mPaint); |
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Path path = new Path(); |
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path.moveTo(0, mHeight - mArcHeight); |
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path.quadTo(mWidth / 2, mHeight, mWidth, mHeight - mArcHeight); |
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canvas.drawPath(path, mPaint); |
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} |
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} |
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|
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@Override |
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
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super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
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int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
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int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
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int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
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int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
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if (widthMode == MeasureSpec.EXACTLY) { |
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mWidth = widthSize; |
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} |
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if (heightMode == MeasureSpec.EXACTLY) { |
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mHeight = heightSize; |
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} |
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setMeasuredDimension(mWidth, mHeight); |
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} |
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} |
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@ -0,0 +1,103 @@ |
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package io.legado.app.ui.widget; |
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import android.annotation.SuppressLint; |
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import android.content.Context; |
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import android.text.Layout; |
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import android.util.AttributeSet; |
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import android.view.MotionEvent; |
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import androidx.appcompat.widget.AppCompatTextView; |
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public class ScrollTextView extends AppCompatTextView { |
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//滑动距离的最大边界
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private int mOffsetHeight; |
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//是否到顶或者到底的标志
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private boolean mBottomFlag = false; |
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public ScrollTextView(Context context) { |
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super(context); |
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} |
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public ScrollTextView(Context context, AttributeSet attrs) { |
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super(context, attrs); |
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} |
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public ScrollTextView(Context context, AttributeSet attrs, int defStyleAttr) { |
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super(context, attrs, defStyleAttr); |
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} |
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@Override |
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
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super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
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initOffsetHeight(); |
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} |
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@Override |
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protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { |
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super.onTextChanged(text, start, lengthBefore, lengthAfter); |
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initOffsetHeight(); |
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} |
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private void initOffsetHeight() { |
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int paddingTop; |
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int paddingBottom; |
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int mHeight; |
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int mLayoutHeight; |
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//获得内容面板
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Layout mLayout = getLayout(); |
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if (mLayout == null) return; |
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//获得内容面板的高度
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mLayoutHeight = mLayout.getHeight(); |
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//获取上内边距
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paddingTop = getTotalPaddingTop(); |
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//获取下内边距
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paddingBottom = getTotalPaddingBottom(); |
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//获得控件的实际高度
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mHeight = getMeasuredHeight(); |
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//计算滑动距离的边界
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mOffsetHeight = mLayoutHeight + paddingTop + paddingBottom - mHeight; |
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if (mOffsetHeight <= 0) { |
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scrollTo(0, 0); |
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} |
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} |
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@Override |
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public boolean dispatchTouchEvent(MotionEvent event) { |
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if (event.getAction() == MotionEvent.ACTION_DOWN) { |
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//如果是新的按下事件，则对mBottomFlag重新初始化
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mBottomFlag = mOffsetHeight <= 0; |
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} |
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//如果已经不要这次事件，则传出取消的信号，这里的作用不大
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if (mBottomFlag) { |
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event.setAction(MotionEvent.ACTION_CANCEL); |
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} |
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return super.dispatchTouchEvent(event); |
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} |
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@SuppressLint("ClickableViewAccessibility") |
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@Override |
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public boolean onTouchEvent(MotionEvent event) { |
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boolean result = super.onTouchEvent(event); |
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//如果是需要拦截，则再拦截，这个方法会在onScrollChanged方法之后再调用一次
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if (!mBottomFlag) |
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getParent().requestDisallowInterceptTouchEvent(true); |
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return result; |
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} |
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@Override |
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protected void onScrollChanged(int horiz, int vert, int oldHoriz, int oldVert) { |
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super.onScrollChanged(horiz, vert, oldHoriz, oldVert); |
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if (vert == mOffsetHeight || vert == 0) { |
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//这里触发父布局或祖父布局的滑动事件
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getParent().requestDisallowInterceptTouchEvent(false); |
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mBottomFlag = true; |
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} |
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} |
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} |
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@ -0,0 +1,9 @@ |
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<?xml version="1.0" encoding="utf-8"?> |
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<resources> |
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<declare-styleable name="ArcView"> |
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<attr name="arcHeight" format="dimension" /> |
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<attr name="bgColor" format="color" /> |
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<attr name="arcDirectionTop" format="boolean" /> |
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</declare-styleable> |
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</resources> |
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