1 files changed, 137 insertions, 0 deletions
diff --git a/src/com/android/launcher3/BaseContainerView.java b/src/com/android/launcher3/BaseContainerView.java
new file mode 100644
index 000000000..c8de9df10
--- /dev/null
+++ b/src/com/android/launcher3/BaseContainerView.java
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2015 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.android.launcher3;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.widget.LinearLayout;
+
+/**
+ * A base container view, which supports resizing.
+ */
+public abstract class BaseContainerView extends LinearLayout implements Insettable {
+
+    private final static String TAG = "BaseContainerView";
+
+    // The window insets
+    private Rect mInsets = new Rect();
+    // The bounds of the search bar.  Only the left, top, right are used to inset the
+    // search bar and the height is determined by the measurement of the layout
+    private Rect mFixedSearchBarBounds = new Rect();
+    // The bounds of the container
+    protected Rect mContentBounds = new Rect();
+    // The padding to apply to the container to achieve the bounds
+    protected Rect mContentPadding = new Rect();
+    // The inset to apply to the edges and between the search bar and the container
+    private int mContainerBoundsInset;
+    private boolean mHasSearchBar;
+
+    public BaseContainerView(Context context) {
+        this(context, null);
+    }
+
+    public BaseContainerView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public BaseContainerView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        mContainerBoundsInset = getResources().getDimensionPixelSize(R.dimen.container_bounds_inset);
+    }
+
+    @Override
+    final public void setInsets(Rect insets) {
+        mInsets.set(insets);
+        updateBackgroundAndPaddings();
+    }
+
+    protected void setHasSearchBar() {
+        mHasSearchBar = true;
+    }
+
+    /**
+     * Sets the search bar bounds for this container view to match.
+     */
+    final public void setSearchBarBounds(Rect bounds) {
+        if (LauncherAppState.isDogfoodBuild() && !isValidSearchBarBounds(bounds)) {
+            Log.e(TAG, "Invalid search bar bounds: " + bounds);
+        }
+
+        mFixedSearchBarBounds.set(bounds);
+
+        // Post the updates since they can trigger a relayout, and this call can be triggered from
+        // a layout pass itself.
+        post(new Runnable() {
+            @Override
+            public void run() {
+                updateBackgroundAndPaddings();
+            }
+        });
+    }
+
+    /**
+     * Update the backgrounds and padding in response to a change in the bounds or insets.
+     */
+    protected void updateBackgroundAndPaddings() {
+        Rect padding;
+        Rect searchBarBounds = new Rect(mFixedSearchBarBounds);
+        if (!isValidSearchBarBounds(mFixedSearchBarBounds)) {
+            // Use the default bounds
+            padding = new Rect(mInsets.left + mContainerBoundsInset,
+                    (mHasSearchBar ? 0 : (mInsets.top + mContainerBoundsInset)),
+                    mInsets.right + mContainerBoundsInset,
+                    mInsets.bottom + mContainerBoundsInset);
+
+            // Special case -- we have the search bar, but no specific bounds, so just give it
+            // the inset bounds without a height.
+            searchBarBounds.set(mInsets.left + mContainerBoundsInset,
+                    mInsets.top + mContainerBoundsInset,
+                    getMeasuredWidth() - (mInsets.right + mContainerBoundsInset), 0);
+        } else {
+            // Use the search bounds, if there is a search bar, the bounds will contain
+            // the offsets for the insets so we can ignore that
+            padding = new Rect(mFixedSearchBarBounds.left,
+                    (mHasSearchBar ? 0 : (mInsets.top + mContainerBoundsInset)),
+                    getMeasuredWidth() - mFixedSearchBarBounds.right,
+                    mInsets.bottom + mContainerBoundsInset);
+        }
+        if (!padding.equals(mContentPadding) || !searchBarBounds.equals(mFixedSearchBarBounds)) {
+            mContentPadding.set(padding);
+            mContentBounds.set(padding.left, padding.top,
+                    getMeasuredWidth() - padding.right,
+                    getMeasuredHeight() - padding.bottom);
+            mFixedSearchBarBounds.set(searchBarBounds);
+            onUpdateBackgroundAndPaddings(mFixedSearchBarBounds, padding);
+        }
+    }
+
+    /**
+     * To be implemented by container views to update themselves when the bounds changes.
+     */
+    protected abstract void onUpdateBackgroundAndPaddings(Rect searchBarBounds, Rect padding);
+
+    /**
+     * Returns whether the search bar bounds we got are considered valid.
+     */
+    private boolean isValidSearchBarBounds(Rect searchBarBounds) {
+        return !searchBarBounds.isEmpty() &&
+                searchBarBounds.right <= getMeasuredWidth() &&
+                searchBarBounds.bottom <= getMeasuredHeight();
+    }
+}
+\ No newline at end of file