Android/.svn/pristine/78/78f22e45ec515a68d715c99d5b2f288558d328e0.svn-base

package eVVM.apk.helper;

import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.PopupWindow;

/**
 *    desc   : PopupWindow辅助类
 */
public final class PopupWindowHelper implements PopupWindow.OnDismissListener {

    private PopupWindow mPopupWindow; // PopupWindow对象
    private final View mPopupView; //PopupWindow显示的View
    private long mDismissTime; // 记录PopupWindow销毁时间

    public PopupWindowHelper(View popupView) {
        mPopupView = popupView;
    }

    public PopupWindowHelper(Context context, int layoutId) {
        mPopupView = View.inflate(context, layoutId, null);
    }

    /**
     * 初始化PopupWindow
     */
    private void initPopupWindow() {
        // 给PopupWindow的View设置缩放动画
        ScaleAnimation sa = new ScaleAnimation(0.5f, 1.0f, 0.5f, 1.0f,
                Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        sa.setDuration(200);
        mPopupView.startAnimation(sa);

        mPopupWindow = new PopupWindow(mPopupView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        // 需要在popupWindow使用动画，必须先设置背景，否则动画不能显示出效果，为了不和当前的背景冲突，这里设置全透明背景的图片
        mPopupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        // 设置外部可触的，点击其他地方会自动消失
        mPopupWindow.setTouchable(true);
        mPopupWindow.setFocusable(true);
        mPopupWindow.setOutsideTouchable(true);
        // 监听PopupWindow销毁监听
        mPopupWindow.setOnDismissListener(this);
    }

    /**
     * {@link PopupWindow.OnDismissListener}
     */
    @Override
    public void onDismiss() {
        // 记录当前销毁的时间
        mDismissTime = System.currentTimeMillis();
    }

    /**
     * 显示一个PopupWindow
     *
     * @param clickView     PopupWindow显示在什么View的下方
     */
    public void show(View clickView) {

        // 如果PopupWindow还未初始化就先进行初始化
        if (mPopupWindow == null) {
            initPopupWindow();
        }

        // 避免用户点击clickView导致的销毁后再次显示的Bug
        if (System.currentTimeMillis() - mDismissTime < 500) {
            return;
        }

        /*
        //获取某个view对象在窗口的位置，然后计算出PopupWindow的位置
        int[] location = new int[2];
        mClickView.getLocationInWindow(location);

        //将PopupWindow显示出来
        mPopupWindow.showAtLocation(mParentView, Gravity.LEFT + Gravity.TOP, 0, location[1] + mClickView.getHeight());
         */

        mPopupWindow.showAsDropDown(clickView);
    }

    /**
     * 销毁当前的PopupWindow
     */
    public void dismiss() {
        if (isShowing()) {
            mPopupWindow.dismiss();
        }
    }

    /**
     * 当前PopupWindow是否已经显示
     */
    public boolean isShowing() {
        return mPopupWindow != null && mPopupWindow.isShowing();
    }

    /**
     * 获取当前的PopupWindow对象
     */
    public @Nullable PopupWindow getPopupWindow() {
        return mPopupWindow;
    }

    /**
     * 获取当前的PopupWindow的View对象
     */
    public @NonNull View getPopupView() {
        return mPopupView;
    }
}