content: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.lb.launcher;
  
  import android.content.Context;
  import android.util.AttributeSet;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.ViewDebug;
  import android.view.ViewGroup;
  
  /**
   * An abstraction of the original CellLayout which supports laying out items
   * which span multiple cells into a grid-like layout.  Also supports dimming
   * to give a preview of its contents.
   */
  public class PagedViewCellLayout extends ViewGroup implements Page {
      static final String TAG = "PagedViewCellLayout";
  
      private int mCellCountX;
      private int mCellCountY;
      private int mOriginalCellWidth;
      private int mOriginalCellHeight;
      private int mCellWidth;
      private int mCellHeight;
      private int mOriginalWidthGap;
      private int mOriginalHeightGap;
      private int mWidthGap;
      private int mHeightGap;
      protected PagedViewCellLayoutChildren mChildren;
  
      public PagedViewCellLayout(Context context) {
          this(context, null);
      }
  
      public PagedViewCellLayout(Context context, AttributeSet attrs) {
          this(context, attrs, 0);
      }
  
      public PagedViewCellLayout(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
  
          setAlwaysDrawnWithCacheEnabled(false);
  
          // setup default cell parameters
          LauncherAppState app = LauncherAppState.getInstance();
          DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
          mOriginalCellWidth = mCellWidth = grid.cellWidthPx;
          mOriginalCellHeight = mCellHeight = grid.cellHeightPx;
          mCellCountX = (int) grid.numColumns;
          mCellCountY = (int) grid.numRows;
          mOriginalWidthGap = mOriginalHeightGap = mWidthGap = mHeightGap = -1;
  
          mChildren = new PagedViewCellLayoutChildren(context);
          mChildren.setCellDimensions(mCellWidth, mCellHeight);
          mChildren.setGap(mWidthGap, mHeightGap);
  
          addView(mChildren);
      }
  
      public int getCellWidth() {
          return mCellWidth;
      }
  
      public int getCellHeight() {
          return mCellHeight;
      }
  
      @Override
      public void cancelLongPress() {
          super.cancelLongPress();
  
          // Cancel long press for all children
          final int count = getChildCount();
          for (int i = 0; i < count; i++) {
              final View child = getChildAt(i);
              child.cancelLongPress();
          }
      }
  
      public boolean addViewToCellLayout(View child, int index, int childId,
              PagedViewCellLayout.LayoutParams params) {
          final PagedViewCellLayout.LayoutParams lp = params;
  
          // Generate an id for each view, this assumes we have at most 256x256 cells
          // per workspace screen
          if (lp.cellX >= 0 && lp.cellX <= (mCellCountX - 1) &&
                  lp.cellY >= 0 && (lp.cellY <= mCellCountY - 1)) {
              // If the horizontal or vertical span is set to -1, it is taken to
              // mean that it spans the extent of the CellLayout
              if (lp.cellHSpan < 0) lp.cellHSpan = mCellCountX;
              if (lp.cellVSpan < 0) lp.cellVSpan = mCellCountY;
  
              child.setId(childId);
              mChildren.addView(child, index, lp);
  
              return true;
          }
          return false;
      }
  
      @Override
      public void removeAllViewsOnPage() {
          mChildren.removeAllViews();
          setLayerType(LAYER_TYPE_NONE, null);
      }
  
      @Override
      public void removeViewOnPageAt(int index) {
          mChildren.removeViewAt(index);
      }
  
      /**
       * Clears all the key listeners for the individual icons.
       */
      public void resetChildrenOnKeyListeners() {
          int childCount = mChildren.getChildCount();
          for (int j = 0; j < childCount; ++j) {
              mChildren.getChildAt(j).setOnKeyListener(null);
          }
      }
  
      @Override
      public int getPageChildCount() {
          return mChildren.getChildCount();
      }
  
      public PagedViewCellLayoutChildren getChildrenLayout() {
          return mChildren;
      }
  
      @Override
      public View getChildOnPageAt(int i) {
          return mChildren.getChildAt(i);
      }
  
      @Override
      public int indexOfChildOnPage(View v) {
          return mChildren.indexOfChild(v);
      }
  
      public int getCellCountX() {
          return mCellCountX;
      }
  
      public int getCellCountY() {
          return mCellCountY;
      }
  
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
          int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
  
          int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
          int heightSpecSize =  MeasureSpec.getSize(heightMeasureSpec);
  
          if (widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED) {
              throw new RuntimeException("CellLayout cannot have UNSPECIFIED dimensions");
          }
  
          int numWidthGaps = mCellCountX - 1;
          int numHeightGaps = mCellCountY - 1;
  
          if (mOriginalWidthGap < 0 || mOriginalHeightGap < 0) {
              int hSpace = widthSpecSize - getPaddingLeft() - getPaddingRight();
              int vSpace = heightSpecSize - getPaddingTop() - getPaddingBottom();
              int hFreeSpace = hSpace - (mCellCountX * mOriginalCellWidth);
              int vFreeSpace = vSpace - (mCellCountY * mOriginalCellHeight);
              mWidthGap = numWidthGaps > 0 ? (hFreeSpace / numWidthGaps) : 0;
              mHeightGap = numHeightGaps > 0 ? (vFreeSpace / numHeightGaps) : 0;
  
              mChildren.setGap(mWidthGap, mHeightGap);
          } else {
              mWidthGap = mOriginalWidthGap;
              mHeightGap = mOriginalHeightGap;
          }
  
          // Initial values correspond to widthSpecMode == MeasureSpec.EXACTLY
          int newWidth = widthSpecSize;
          int newHeight = heightSpecSize;
          if (widthSpecMode == MeasureSpec.AT_MOST) {
              newWidth = getPaddingLeft() + getPaddingRight() + (mCellCountX * mCellWidth) +
                  ((mCellCountX - 1) * mWidthGap);
              newHeight = getPaddingTop() + getPaddingBottom() + (mCellCountY * mCellHeight) +
                  ((mCellCountY - 1) * mHeightGap);
              setMeasuredDimension(newWidth, newHeight);
          }
  
          final int count = getChildCount();
          for (int i = 0; i < count; i++) {
              View child = getChildAt(i);
              int childWidthMeasureSpec =
                  MeasureSpec.makeMeasureSpec(newWidth - getPaddingLeft() -
                          getPaddingRight(), MeasureSpec.EXACTLY);
              int childheightMeasureSpec =
                  MeasureSpec.makeMeasureSpec(newHeight - getPaddingTop() -
                          getPaddingBottom(), MeasureSpec.EXACTLY);
              child.measure(childWidthMeasureSpec, childheightMeasureSpec);
          }
  
          setMeasuredDimension(newWidth, newHeight);
      }
  
      int getContentWidth() {
          return getWidthBeforeFirstLayout() + getPaddingLeft() + getPaddingRight();
      }
  
      int getContentHeight() {
          if (mCellCountY > 0) {
              return mCellCountY * mCellHeight + (mCellCountY - 1) * Math.max(0, mHeightGap);
          }
          return 0;
      }
  
      int getWidthBeforeFirstLayout() {
          if (mCellCountX > 0) {
              return mCellCountX * mCellWidth + (mCellCountX - 1) * Math.max(0, mWidthGap);
          }
          return 0;
      }
  
      @Override
      protected void onLayout(boolean changed, int l, int t, int r, int b) {
          int count = getChildCount();
          for (int i = 0; i < count; i++) {
              View child = getChildAt(i);
              child.layout(getPaddingLeft(), getPaddingTop(),
                  r - l - getPaddingRight(), b - t - getPaddingBottom());
          }
      }
  
      @Override
      public boolean onTouchEvent(MotionEvent event) {
          boolean result = super.onTouchEvent(event);
          int count = getPageChildCount();
          if (count > 0) {
              // We only intercept the touch if we are tapping in empty space after the final row
              View child = getChildOnPageAt(count - 1);
              int bottom = child.getBottom();
              int numRows = (int) Math.ceil((float) getPageChildCount() / getCellCountX());
              if (numRows < getCellCountY()) {
                  // Add a little bit of buffer if there is room for another row
                  bottom += mCellHeight / 2;
              }
              result = result || (event.getY() < bottom);
          }
          return result;
      }
  
      public void enableCenteredContent(boolean enabled) {
          mChildren.enableCenteredContent(enabled);
      }
  
      @Override
      protected void setChildrenDrawingCacheEnabled(boolean enabled) {
          mChildren.setChildrenDrawingCacheEnabled(enabled);
      }
  
      public void setCellCount(int xCount, int yCount) {
          mCellCountX = xCount;
          mCellCountY = yCount;
          requestLayout();
      }
  
      public void setGap(int widthGap, int heightGap) {
          mOriginalWidthGap = mWidthGap = widthGap;
          mOriginalHeightGap = mHeightGap = heightGap;
          mChildren.setGap(widthGap, heightGap);
      }
  
      public int[] getCellCountForDimensions(int width, int height) {
          // Always assume we're working with the smallest span to make sure we
          // reserve enough space in both orientations
          int smallerSize = Math.min(mCellWidth, mCellHeight);
  
          // Always round up to next largest cell
          int spanX = (width + smallerSize) / smallerSize;
          int spanY = (height + smallerSize) / smallerSize;
  
          return new int[] { spanX, spanY };
      }
  
      /**
       * Start dragging the specified child
       *
       * @param child The child that is being dragged
       */
      void onDragChild(View child) {
          PagedViewCellLayout.LayoutParams lp = (PagedViewCellLayout.LayoutParams) child.getLayoutParams();
          lp.isDragging = true;
      }
  
      /**
       * Estimates the number of cells that the specified width would take up.
       */
      public int estimateCellHSpan(int width) {
          // We don't show the next/previous pages any more, so we use the full width, minus the
          // padding
          int availWidth = width - (getPaddingLeft() + getPaddingRight());
  
          // We know that we have to fit N cells with N-1 width gaps, so we just juggle to solve for N
          int n = Math.max(1, (availWidth + mWidthGap) / (mCellWidth + mWidthGap));
  
          // We don't do anything fancy to determine if we squeeze another row in.
          return n;
      }
  
      /**
       * Estimates the number of cells that the specified height would take up.
       */
      public int estimateCellVSpan(int height) {
          // The space for a page is the height - top padding (current page) - bottom padding (current
          // page)
          int availHeight = height - (getPaddingTop() + getPaddingBottom());
  
          // We know that we have to fit N cells with N-1 height gaps, so we juggle to solve for N
          int n = Math.max(1, (availHeight + mHeightGap) / (mCellHeight + mHeightGap));
  
          // We don't do anything fancy to determine if we squeeze another row in.
          return n;
      }
  
      /** Returns an estimated center position of the cell at the specified index */
      public int[] estimateCellPosition(int x, int y) {
          return new int[] {
                  getPaddingLeft() + (x * mCellWidth) + (x * mWidthGap) + (mCellWidth / 2),
                  getPaddingTop() + (y * mCellHeight) + (y * mHeightGap) + (mCellHeight / 2)
          };
      }
  
      public void calculateCellCount(int width, int height, int maxCellCountX, int maxCellCountY) {
          mCellCountX = Math.min(maxCellCountX, estimateCellHSpan(width));
          mCellCountY = Math.min(maxCellCountY, estimateCellVSpan(height));
          requestLayout();
      }
  
      /**
       * Estimates the width that the number of hSpan cells will take up.
       */
      public int estimateCellWidth(int hSpan) {
          // TODO: we need to take widthGap into effect
          return hSpan * mCellWidth;
      }
  
      /**
       * Estimates the height that the number of vSpan cells will take up.
       */
      public int estimateCellHeight(int vSpan) {
          // TODO: we need to take heightGap into effect
          return vSpan * mCellHeight;
      }
  
      @Override
      public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
          return new PagedViewCellLayout.LayoutParams(getContext(), attrs);
      }
  
      @Override
      protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
          return p instanceof PagedViewCellLayout.LayoutParams;
      }
  
      @Override
      protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
          return new PagedViewCellLayout.LayoutParams(p);
      }
  
      public static class LayoutParams extends ViewGroup.MarginLayoutParams {
          /**
           * Horizontal location of the item in the grid.
           */
          @ViewDebug.ExportedProperty
          public int cellX;
  
          /**
           * Vertical location of the item in the grid.
           */
          @ViewDebug.ExportedProperty
          public int cellY;
  
          /**
           * Number of cells spanned horizontally by the item.
           */
          @ViewDebug.ExportedProperty
          public int cellHSpan;
  
          /**
           * Number of cells spanned vertically by the item.
           */
          @ViewDebug.ExportedProperty
          public int cellVSpan;
  
          /**
           * Is this item currently being dragged
           */
          public boolean isDragging;
  
          // a data object that you can bind to this layout params
          private Object mTag;
  
          // X coordinate of the view in the layout.
          @ViewDebug.ExportedProperty
          int x;
          // Y coordinate of the view in the layout.
          @ViewDebug.ExportedProperty
          int y;
  
          public LayoutParams() {
              super(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
              cellHSpan = 1;
              cellVSpan = 1;
          }
  
          public LayoutParams(Context c, AttributeSet attrs) {
              super(c, attrs);
              cellHSpan = 1;
              cellVSpan = 1;
          }
  
          public LayoutParams(ViewGroup.LayoutParams source) {
              super(source);
              cellHSpan = 1;
              cellVSpan = 1;
          }
  
          public LayoutParams(LayoutParams source) {
              super(source);
              this.cellX = source.cellX;
              this.cellY = source.cellY;
              this.cellHSpan = source.cellHSpan;
              this.cellVSpan = source.cellVSpan;
          }
  
          public LayoutParams(int cellX, int cellY, int cellHSpan, int cellVSpan) {
              super(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
              this.cellX = cellX;
              this.cellY = cellY;
              this.cellHSpan = cellHSpan;
              this.cellVSpan = cellVSpan;
          }
  
          public void setup(Context context,
                            int cellWidth, int cellHeight, int widthGap, int heightGap,
                            int hStartPadding, int vStartPadding) {
  
              final int myCellHSpan = cellHSpan;
              final int myCellVSpan = cellVSpan;
              final int myCellX = cellX;
              final int myCellY = cellY;
  
              width = myCellHSpan * cellWidth + ((myCellHSpan - 1) * widthGap) -
                      leftMargin - rightMargin;
              height = myCellVSpan * cellHeight + ((myCellVSpan - 1) * heightGap) -
                      topMargin - bottomMargin;
  
              if (LauncherAppState.getInstance().isScreenLarge()) {
                  x = hStartPadding + myCellX * (cellWidth + widthGap) + leftMargin;
                  y = vStartPadding + myCellY * (cellHeight + heightGap) + topMargin;
              } else {
                  x = myCellX * (cellWidth + widthGap) + leftMargin;
                  y = myCellY * (cellHeight + heightGap) + topMargin;
              }
          }
  
          public Object getTag() {
              return mTag;
          }
  
          public void setTag(Object tag) {
              mTag = tag;
          }
  
          public String toString() {
              return "(" + this.cellX + ", " + this.cellY + ", " +
                  this.cellHSpan + ", " + this.cellVSpan + ")";
          }
      }
  }