1 files changed, 138 insertions, 0 deletions
diff --git a/setupwizardlib/src/main/java/com/android/setupwizardlib/view/NavigationBar.java b/setupwizardlib/src/main/java/com/android/setupwizardlib/view/NavigationBar.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.setupwizardlib.view;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Color;
+import android.os.Build.VERSION_CODES;
+import android.util.AttributeSet;
+import android.view.ContextThemeWrapper;
+import android.view.View;
+import android.widget.Button;
+import android.widget.LinearLayout;
+
+import com.android.setupwizardlib.R;
+
+/**
+ * Custom navigation bar for use with setup wizard. This bar contains a back button, more button and
+ * next button. By default, the more button is hidden, and typically the next button will be hidden
+ * if the more button is shown.
+ *
+ * @see com.android.setupwizardlib.util.RequireScrollHelper
+ */
+public class NavigationBar extends LinearLayout implements View.OnClickListener {
+
+    /**
+     * An interface to listen to events of the navigation bar, namely when the user clicks on the
+     * back or next button.
+     */
+    public interface NavigationBarListener {
+        void onNavigateBack();
+        void onNavigateNext();
+    }
+
+    private static int getNavbarTheme(Context context) {
+        // Normally we can automatically guess the theme by comparing the foreground color against
+        // the background color. But we also allow specifying explicitly using suwNavBarTheme.
+        TypedArray attributes = context.obtainStyledAttributes(
+                new int[] {
+                        R.attr.suwNavBarTheme,
+                        android.R.attr.colorForeground,
+                        android.R.attr.colorBackground });
+        int theme = attributes.getResourceId(0, 0);
+        if (theme == 0) {
+            // Compare the value of the foreground against the background color to see if current
+            // theme is light-on-dark or dark-on-light.
+            float[] foregroundHsv = new float[3];
+            float[] backgroundHsv = new float[3];
+            Color.colorToHSV(attributes.getColor(1, 0), foregroundHsv);
+            Color.colorToHSV(attributes.getColor(2, 0), backgroundHsv);
+            boolean isDarkBg = foregroundHsv[2] > backgroundHsv[2];
+            theme = isDarkBg ? R.style.SuwNavBarThemeDark : R.style.SuwNavBarThemeLight;
+        }
+        attributes.recycle();
+        return theme;
+    }
+
+    private static Context getThemedContext(Context context) {
+        final int theme = getNavbarTheme(context);
+        return new ContextThemeWrapper(context, theme);
+    }
+
+    private Button mNextButton;
+    private Button mBackButton;
+    private Button mMoreButton;
+    private NavigationBarListener mListener;
+
+    public NavigationBar(Context context) {
+        super(getThemedContext(context));
+        init();
+    }
+
+    public NavigationBar(Context context, AttributeSet attrs) {
+        super(getThemedContext(context), attrs);
+        init();
+    }
+
+    @TargetApi(VERSION_CODES.HONEYCOMB)
+    public NavigationBar(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(getThemedContext(context), attrs, defStyleAttr);
+        init();
+    }
+
+    // All the constructors delegate to this init method. The 3-argument constructor is not
+    // available in LinearLayout before v11, so call super with the exact same arguments.
+    private void init() {
+        View.inflate(getContext(), R.layout.suw_navbar_view, this);
+        mNextButton = (Button) findViewById(R.id.suw_navbar_next);
+        mBackButton = (Button) findViewById(R.id.suw_navbar_back);
+        mMoreButton = (Button) findViewById(R.id.suw_navbar_more);
+    }
+
+    public Button getBackButton() {
+        return mBackButton;
+    }
+
+    public Button getNextButton() {
+        return mNextButton;
+    }
+
+    public Button getMoreButton() {
+        return mMoreButton;
+    }
+
+    public void setNavigationBarListener(NavigationBarListener listener) {
+        mListener = listener;
+        if (mListener != null) {
+            getBackButton().setOnClickListener(this);
+            getNextButton().setOnClickListener(this);
+        }
+    }
+
+    @Override
+    public void onClick(View view) {
+        if (mListener != null) {
+            if (view == getBackButton()) {
+                mListener.onNavigateBack();
+            } else if (view == getNextButton()) {
+                mListener.onNavigateNext();
+            }
+        }
+    }
+}