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Diffstat (limited to 'src/com/android/packageinstaller/permission/ui/ButtonBarLayout.java')
-rw-r--r--src/com/android/packageinstaller/permission/ui/ButtonBarLayout.java117
1 files changed, 117 insertions, 0 deletions
diff --git a/src/com/android/packageinstaller/permission/ui/ButtonBarLayout.java b/src/com/android/packageinstaller/permission/ui/ButtonBarLayout.java
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+++ b/src/com/android/packageinstaller/permission/ui/ButtonBarLayout.java
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+/*
+ * 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.packageinstaller.permission.ui;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.LinearLayout;
+import com.android.packageinstaller.R;
+
+/**
+ * An extension of LinearLayout that automatically switches to vertical
+ * orientation when it can't fit its child views horizontally.
+ */
+public class ButtonBarLayout extends LinearLayout {
+ /** Whether the current configuration allows stacking. */
+ private boolean mAllowStacking;
+
+ private int mLastWidthSize = -1;
+
+ public ButtonBarLayout(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ mAllowStacking = true;
+ }
+
+ public void setAllowStacking(boolean allowStacking) {
+ if (mAllowStacking != allowStacking) {
+ mAllowStacking = allowStacking;
+ if (!mAllowStacking && getOrientation() == LinearLayout.VERTICAL) {
+ setStacked(false);
+ }
+ requestLayout();
+ }
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
+
+ if (mAllowStacking) {
+ if (widthSize > mLastWidthSize && isStacked()) {
+ // We're being measured wider this time, try un-stacking.
+ setStacked(false);
+ }
+
+ mLastWidthSize = widthSize;
+ }
+
+ boolean needsRemeasure = false;
+
+ // If we're not stacked, make sure the measure spec is AT_MOST rather
+ // than EXACTLY. This ensures that we'll still get TOO_SMALL so that we
+ // know to stack the buttons.
+ final int initialWidthMeasureSpec;
+ if (!isStacked() && MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY) {
+ initialWidthMeasureSpec = MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.AT_MOST);
+
+ // We'll need to remeasure again to fill excess space.
+ needsRemeasure = true;
+ } else {
+ initialWidthMeasureSpec = widthMeasureSpec;
+ }
+
+ super.onMeasure(initialWidthMeasureSpec, heightMeasureSpec);
+
+ if (mAllowStacking && !isStacked()) {
+ final int measuredWidth = getMeasuredWidthAndState();
+ final int measuredWidthState = measuredWidth & MEASURED_STATE_MASK;
+ if (measuredWidthState == MEASURED_STATE_TOO_SMALL) {
+ setStacked(true);
+
+ // Measure again in the new orientation.
+ needsRemeasure = true;
+ }
+ }
+
+ if (needsRemeasure) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+ }
+ }
+
+ private void setStacked(boolean stacked) {
+ setOrientation(stacked ? LinearLayout.VERTICAL : LinearLayout.HORIZONTAL);
+ setGravity(stacked ? Gravity.RIGHT : Gravity.BOTTOM);
+
+ final View spacer = findViewById(R.id.spacer);
+ if (spacer != null) {
+ spacer.setVisibility(stacked ? View.GONE : View.INVISIBLE);
+ }
+
+ // Reverse the child order. This is specific to the Material button
+ // bar's layout XML and will probably not generalize.
+ final int childCount = getChildCount();
+ for (int i = childCount - 2; i >= 0; i--) {
+ bringChildToFront(getChildAt(i));
+ }
+ }
+
+ private boolean isStacked() {
+ return getOrientation() == LinearLayout.VERTICAL;
+ }
+}