修复剪裁窗口画布控件缩放和布局问题

- 修复ZoomContainerView缩放按钮无效问题，添加onLayout正确缩放子视图
- 修复CropCanvasView裁剪框显示不一致问题
- 更新libappbase版本到15.15.20
- 优化剪裁窗口布局

gallery/src/main/java/cc/winboll/studio/gallery/ZoomContainerView.java

@@ -72,16 +72,27 @@ public class ZoomContainerView extends FrameLayout {
     
     public void zoomIn() {
         scaleFactor = Math.min(maxScale, scaleFactor + ZOOM_STEP);
-        invalidate();
-        requestLayout();
+        requestMeasure();
     }
     
     public void zoomOut() {
         scaleFactor = Math.max(minScale, scaleFactor - ZOOM_STEP);
-        invalidate();
-        requestLayout();
+        requestMeasure();
     }
     
+    private void requestMeasure() {
+        removeCallbacks(measureRunable);
+        post(measureRunable);
+    }
+    
+    private Runnable measureRunable = new Runnable() {
+        @Override
+        public void run() {
+            requestLayout();
+            invalidate();
+        }
+    };
+    
     public float getScaleFactor() {
         return scaleFactor;
     }
@@ -94,17 +105,37 @@ public class ZoomContainerView extends FrameLayout {
     
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
         int childCount = getChildCount();
         if (childCount > 0) {
             View child = getChildAt(0);
-            measureChild(child, widthMeasureSpec, heightMeasureSpec);
-            int childW = (int) (child.getMeasuredWidth() * scaleFactor);
-            int childH = (int) (child.getMeasuredHeight() * scaleFactor);
-            setMeasuredDimension(
-                MeasureSpec.getSize(widthMeasureSpec),
-                MeasureSpec.getSize(heightMeasureSpec)
-            );
+            child.measure(widthMeasureSpec, heightMeasureSpec);
+            int childW = child.getMeasuredWidth();
+            int childH = child.getMeasuredHeight();
+            int scaledW = (int) (childW * scaleFactor);
+            int scaledH = (int) (childH * scaleFactor);
+            int widthSpec = MeasureSpec.makeMeasureSpec(scaledW, MeasureSpec.EXACTLY);
+            int heightSpec = MeasureSpec.makeMeasureSpec(scaledH, MeasureSpec.EXACTLY);
+            child.measure(widthSpec, heightSpec);
+            setMeasuredDimension(scaledW, scaledH);
+        } else {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        }
+    }
+    
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        int childCount = getChildCount();
+        if (childCount > 0) {
+            View child = getChildAt(0);
+            int childW = child.getMeasuredWidth();
+            int childH = child.getMeasuredHeight();
+            int scaledW = (int) (childW * scaleFactor);
+            int scaledH = (int) (childH * scaleFactor);
+            int parentW = right - left;
+            int parentH = bottom - top;
+            int childLeft = (parentW - scaledW) / 2;
+            int childTop = (parentH - scaledH) / 2;
+            child.layout(childLeft, childTop, childLeft + scaledW, childTop + scaledH);
         }
     }