DrawableLeft,DrawableTop,Right,Bottom点击事件的实现
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DrawableListener
作者:丁创世 原文地址
相信大家和我一样,在很多地方都会用到DrawableLeft,或者DrawableRight,DrawableTop,DrawableBottom的点击事件的问题,但是呢?遗憾的是原生的控件并没有给出这样的接口,所以呢,今天我就拿出我自己写的一个控件来和大家一起分享一下,如果有更好的方法还请多多指教。
一、功能简介
对DrawableLeft,DrawableTop,DrawableRight,DrawableBottom,分别自定义事件,
二、需求分析
在我们遇到上述这样的需求的时候,当我们点击右侧的显示密码,就会将密码显示出来,那么如果实现这一功能,首先我们就必须做好对右侧图标的事件监听,很明显右侧可能是一个DrawableRight,那么我们现在就需要自定义控件实现这一功能,下面,我们根据EditText控件进行讲解。
三、原理分析
- 首先我们来看一下一个View的控件由那几部分组成
2.如上图所示,假设他是一个Button,它分别设置了layout_margin,padding,drawableLeft,Top,Right,Bottom,以及,drawablePadding,我们来一次看一个他们分别位于那个位置
3.上图1,2, 3, 4 分别表示他的四个drawable,并且从左到右依次为
layout_marginLeft paddingLeft drawableLeft drawablePadding button//本身 drawablePadding drawableRight paddingRight layout_marginRight
4.也就是说,只要当我们点击到1,2,3,4,任何一个区域,我们就调用相应的接口便可,所以我们主要做的就是判断,点击部位是否在这四个区域就行来,也就是简单的坐标计算,
event.getX()event.getY()
5.我们使用这两个方法获取x,和y的坐标,是获取相对于View本身的坐标值,也就是以控件左上角为o点的坐标轴,还有一个getRawX()和getRawY();是获取相对于相对于屏幕的坐标值,最后我们只要根据坐标计算是否处于以上四个位置,就可以判断是否触发事件,
四、代码实现
- 接下来我们根据DrawableLeft的实现来介绍,其他三个大同小异,最后会给出代码。
2.因为是以getX(),getY(),以自身为坐标轴,也就是上图黄色区域,在根据三中原理分析,第3小节给出的,我们可以计算
//左边event.getX() >= getPaddingLeft()//右边&& event.getX() <= (drawableLeft.getBounds().width() + getPaddingLeft())
3.相同的是再判断Y方向,因为这里需要判断DrawableTop,和,DrawableBottom是否存在,所以我们使用三目运算符
drawableTop != null?drawableTop.getBounds().height():0//上面getY()>=getPaddingTop()+(drawableTop != null?drawableTop.getBounds().height():0) + drawablePadding//下面getY()<=getHeight()-getPaddingBottom()-(drawableBottom!= null?drawableBottom.getBounds().height():0) -drawablePadding
这样四个方向就都满足了,那么也就完成了,写的比较乱,还望见谅
五、代码
XEditText.javapackage com.example.orchid.MySelfWeChat.ui.wight;import android.content.Context;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.Button;import android.widget.EditText;public class XEditText extends EditText { private DrawableLeftListener mLeftListener ; private DrawableTopListener mTopListener ; private DrawableRightListener mRightListener ; private DrawableBottonListener mBottonListener; final int DRAWABLE_LEFT = 0; final int DRAWABLE_TOP = 1; final int DRAWABLE_RIGHT = 2; final int DRAWABLE_BOTTOM = 3; public XEditText(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public XEditText(Context context, AttributeSet attrs) { super(context, attrs); } public XEditText(Context context) { super(context); } /** * getX():相对于自身左上角的值 * getRawX():相对于屏幕左上角 * @param event * @return */ @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_UP: Drawable[] drawables = getCompoundDrawables(); int drawablePadding = getCompoundDrawablePadding(); /** * drawableleft click listener */ if (mLeftListener != null) { Drawable drawableLeft = drawables[DRAWABLE_LEFT] ; if (drawableLeft != null && event.getX() <= (drawableLeft.getBounds().width() + getPaddingLeft()) && event.getX() >= getPaddingLeft() && event.getY() <= getHeight() - getPaddingBottom() - (drawables[DRAWABLE_BOTTOM] != null?drawables[DRAWABLE_BOTTOM].getBounds().height():0) -drawablePadding && event.getY() >= getPaddingTop() + (drawables[DRAWABLE_TOP] != null?drawables[DRAWABLE_TOP].getBounds().height():0) + drawablePadding) { mLeftListener.onDrawableLeftClick(this); return true ; } } /** * drawableTop click listener */ if(mTopListener != null){ Drawable drawableTop = getCompoundDrawables()[DRAWABLE_TOP]; if(drawableTop != null && event.getX() <= getWidth() - (drawables[DRAWABLE_RIGHT] != null?drawables[DRAWABLE_RIGHT].getBounds().width():0) - getPaddingRight() - drawablePadding && event.getX() >= getPaddingLeft() + (drawables[DRAWABLE_LEFT] != null ?drawables[DRAWABLE_LEFT].getBounds().width():0) + drawablePadding && event.getY() <= getPaddingTop() + drawableTop.getBounds().height() && event.getY() >= getPaddingTop()){ mTopListener.onDrawableTopClick(this); return true; } } /** * drawableright click listener */ if (mRightListener != null) { Drawable drawableRight = getCompoundDrawables()[DRAWABLE_RIGHT] ; if (drawableRight != null && event.getX() <= getWidth() - getPaddingRight() && event.getX() >= getWidth() - getPaddingRight() - drawableRight.getBounds().width() && event.getY() <= getHeight() - getPaddingBottom() - (drawables[DRAWABLE_BOTTOM] != null ? drawables[DRAWABLE_BOTTOM].getBounds().height():0) -drawablePadding && event.getY() >= getPaddingTop() + (drawables[DRAWABLE_TOP] != null ? drawables[DRAWABLE_TOP].getBounds().height():0) + drawablePadding) { mRightListener.onDrawableRightClick(this) ; return true ; } } /** * drawableBottom click listener */ if (mBottonListener != null) { Drawable drawableBotton = drawables[DRAWABLE_LEFT] ; if (drawableBotton != null && event.getX() <= getWidth() - (drawables[DRAWABLE_RIGHT] != null ? drawables[DRAWABLE_RIGHT].getBounds().width():0) - getPaddingRight() - drawablePadding && event.getX() >= getPaddingLeft() + (drawables[DRAWABLE_LEFT] != null ? drawables[DRAWABLE_LEFT].getBounds().width():0) + drawablePadding && event.getY() <= getHeight() - getPaddingBottom() && event.getY() >= getHeight() - (drawables[DRAWABLE_BOTTOM] != null ? drawables[DRAWABLE_BOTTOM].getBounds().height():0) - getPaddingBottom()) { mBottonListener.onDrawableBottonClick(this); return true ; } } } return super.onTouchEvent(event); } public void setDrawableLeftListener(DrawableLeftListener listener) { this.mLeftListener = listener; } public void setDrawableTopListener(DrawableTopListener listener){ this.mTopListener = listener; } public void setDrawableRightListener(DrawableRightListener listener) { this.mRightListener = listener; } public void setDrawableBottonListener(DrawableBottonListener listener){ this.mBottonListener = listener; } public interface DrawableLeftListener { public void onDrawableLeftClick(View view) ; } public interface DrawableTopListener { public void onDrawableTopClick(View view) ; } public interface DrawableRightListener { public void onDrawableRightClick(View view) ; } public interface DrawableBottonListener { public void onDrawableBottonClick(View view) ; }}MainActivity.javapackage com.example.myapplication;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;public class MainActivity extends AppCompatActivity{ private XEditText et_click; private static final String TAG = "MainActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et_click = (XBotton) findViewById(R.id.et_click); et_click.setDrawableLeftListener(new XEditText.DrawableLeftListener() { @Override public void onDrawableLeftClick(View view) { Log.i(TAG, "onDrawableLeftClick: "+"left"); } }); et_click.setDrawableTopListener(new XEditText.DrawableTopListener() { @Override public void onDrawableTopClick(View view) { Log.i(TAG, "onDrawableTopClick: Top"); } }); et_click.setDrawableRightListener(new XEditText.DrawableRightListener() { @Override public void onDrawableRightClick(View view) { Log.i(TAG, "onDrawableRightClick: Right"); } }); et_click.setDrawableBottonListener(new XEditText.DrawableBottonListener() { @Override public void onDrawableBottonClick(View view) { Log.i(TAG, "onDrawableBottonClick: Bottom"); } }); }}action_layout.xml <com.example.myapplication.XEditText android:background="#4444" android:drawableLeft="@mipmap/ic_launcher" android:drawableRight="@mipmap/ic_launcher" android:drawableBottom="@mipmap/ic_launcher" android:drawableTop="@mipmap/ic_launcher" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/et_click" android:padding="60dp" android:text="测试" android:drawablePadding="20dp" android:layout_margin="20dp"/>
github地址
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