ADD file via upload

main/java/com/example/musicwork/freeModel/MusicScoreLayout.java

@@ -0,0 +1,89 @@
+package com.example.musicwork.freeModel;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+
+public class MusicScoreLayout extends ViewGroup {
+
+    private int width;
+    private int height;
+
+    //构造方法
+    public MusicScoreLayout(Context context) {
+        super(context);
+    }
+
+    public MusicScoreLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public MusicScoreLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    //设置宽高？
+    public void setWidth(int width) {
+        this.width = width;
+        requestLayout();
+    }
+
+    public void setHeight(int height) {
+        this.height = height;
+        requestLayout();
+    }
+
+    //控制子控件的换行
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        int cellWidth = width;
+        int cellheight = height;
+        int columns = (r - 1) / cellWidth;
+        if (columns < 0) {
+            columns = 1;
+        }
+        int x = 0, y = 0, i = 0;
+        int count = getChildCount();//获取子控件数量
+        for (int j = 0; j < count; j++) {
+            final View childView = getChildAt(j);//获取子控件
+            //获取子控件宽高
+            int w = childView.getMeasuredWidth();
+            int h = childView.getMeasuredHeight();
+            //计算子控件顶点坐标?
+            int left = x + (cellWidth - w) / 2;
+            int top = y + (cellheight - h) / 2;
+            //放置子控件?
+            childView.layout(left, top, left + w, top + h);
+
+            if (i >= (columns - 1)) {
+                i = 0;
+                x = 0;
+                y += cellheight;
+            } else {
+                i++;
+                x += cellWidth;
+            }
+        }
+    }
+
+    //计算控件及子控件所占区域
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        //创建测量参数
+        int cellWidthSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST);
+        int cellHeightSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
+        //记录ViewGroup中Child的总个数
+        int count = getChildCount();
+        //设置子控件的宽高
+        for (int i = 0; i < count; i++) {
+            View childView = getChildAt(i);
+            childView.measure(cellWidthSpec, cellHeightSpec);
+        }
+        //设置容器控件所占区域大小
+        //int paddingLeft = this.getPaddingLeft();
+        //int paddingRight = this.getPaddingRight();
+        setMeasuredDimension(resolveSize(width * count, widthMeasureSpec), resolveSize(height * count, heightMeasureSpec));//???
+        //setMeasuredDimension(width, resolveSize(height * count, heightMeasureSpec));
+    }
+}