TvFocusGridView.java
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package com.xgimi.gimicinema.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.GridView;
/**
* 重写dispatchDraw，在选中项上绘制一个focus-drawable
* * author : stone * email : aa86799@163.com * time : 16/5/11 10 20
*/
public class TvFocusGridView extends GridView {
float mMyScaleX = 1.0f;
float mMyScaleY = 1.0f;
protected Rect mMySelectedPaddingRect = new Rect();
int mPlayIconMargin;
private int position = 0;
public TvFocusGridView(Context contxt) {
super(contxt);
setChildrenDrawingOrderEnabled(true);
setClipChildren(false);
setClipToPadding(false);
}
public TvFocusGridView(Context contxt, AttributeSet attrs) {
super(contxt, attrs);
setChildrenDrawingOrderEnabled(true);
setClipChildren(false);
setClipToPadding(false);
}
public TvFocusGridView(Context contxt, AttributeSet attrs, int defStyle) {
super(contxt, attrs, defStyle);
setChildrenDrawingOrderEnabled(true);
setClipChildren(false);
setClipToPadding(false);
}
@Override
public void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
if (mMySelectedDrawable == null)
return;
drawSelector(canvas);
}
/**
* 设置焦点框的图片
*
* @param resId
*/
public void setMySelector(int resId) {
mMySelectedDrawable = getResources().getDrawable(resId);
mMySelectedPaddingRect = new Rect();
mMySelectedDrawable.getPadding(mMySelectedPaddingRect);//获取drawable所画区域的内边框
}
protected Drawable mMySelectedDrawable = null;
protected View mMySelectedView = null;
protected Rect mTmpSelectedRect = new Rect();
protected Rect mTmpGridViewRect = new Rect();
/**
* 这是关键点
*
* @param canvas
*/
protected void drawSelector(Canvas canvas) {
View v = getSelectedView();
bringChildToFront(v);
if (isFocused() && v != null) {
scaleCurrentView();
// if (v instanceof RelativeLayout) {
// RelativeLayout rl = (RelativeLayout) v;
// ImageView tmepView = (ImageView) rl.getChildAt(0);
//// TextView tv = (TextView) rl.getChildAt(1);
//// tv.setTextColor(Color.WHITE);
// Rect r = mTmpSelectedRect;
// tmepView.getGlobalVisibleRect(r);//Rect(62, 152 - 398, 512) 计算出imageview在屏幕的坐标点
// getGlobalVisibleRect(mTmpGridViewRect);//计算出屏幕的坐标点 Rect(45, 141 - 1875, 1035)
//
// r.offset(-mTmpGridViewRect.left, -mTmpGridViewRect.top);//向左移动--mTmpGridViewRect.left就是向右滑动-mTmpGridViewRect.left
//
// r.top -= mMySelectedPaddingRect.top + DensityUtil.dip2px(getContext(), 6);
// r.left -= mMySelectedPaddingRect.left + DensityUtil.dip2px(getContext(), 6);
// r.right += mMySelectedPaddingRect.right + DensityUtil.dip2px(getContext(), 6);
// r.bottom += mMySelectedPaddingRect.bottom + DensityUtil.dip2px(getContext(), 6);
// mMySelectedDrawable.setBounds(r);
// mMySelectedDrawable.draw(canvas);
// }
}
}
public void setMyScaleValues(float scaleX, float scaleY) {
mMyScaleX = scaleX;
mMyScaleY = scaleY;
}
void scaleCurrentView() {
View v = getSelectedView();
unScalePrevView();
if (v != null) {
mMySelectedView = v;
mMySelectedView.setScaleX(mMyScaleX);
mMySelectedView.setScaleY(mMyScaleY);
}
}
/**
* 把上一次获取焦点 还原
*/
void unScalePrevView() {
if (mMySelectedView != null) {
// if(mMySelectedView instanceof RelativeLayout){
// RelativeLayout rl = (RelativeLayout) mMySelectedView;
// TextView tv = (TextView) rl.getChildAt(1);
// tv.setTextColor(Color.RED);
// }
mMySelectedView.setScaleX(1);
mMySelectedView.setScaleY(1);
mMySelectedView = null;
}
}
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
if (!gainFocus) {
unScalePrevView();
requestLayout();
}
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
}
protected int mMyVerticalSpacing = 0;
public void setMyVerticalSpacing(int verticalSpacing) {
mMyVerticalSpacing = verticalSpacing;
}
public int getMyVerticalSpacing() {
return mMyVerticalSpacing;
}
@Override
protected int getChildDrawingOrder(int childCount, int i) {
if (position != -1) {
if (i == childCount - 1)
return position;
if (i == position)
return childCount - 1;
}
return i;
}
@Override
public void bringChildToFront(View child) {
position = indexOfChild(child);
position = position - getFirstVisiblePosition();
postInvalidate();
}
}