1 files changed, 253 insertions, 0 deletions
diff --git a/src/com/android/browser/BreadCrumbView.java b/src/com/android/browser/BreadCrumbView.java
new file mode 100644
index 000000000..d2a50c94a
--- /dev/null
+++ b/src/com/android/browser/BreadCrumbView.java
@@ -0,0 +1,253 @@
+/*
+ * 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.android.browser;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.Gravity;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Simple bread crumb view
+ * Use setController to receive callbacks from user interactions
+ * Use pushView, popView, clear, and getTopData to change/access the view stack
+ */
+public class BreadCrumbView extends LinearLayout implements OnClickListener {
+
+    interface Controller {
+        public void onTop(int level, Object data);
+    }
+
+    private ImageButton mBackButton;
+    private Controller mController;
+    private List<Crumb> mCrumbs;
+    private boolean mUseBackButton;
+
+    /**
+     * @param context
+     * @param attrs
+     * @param defStyle
+     */
+    public BreadCrumbView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context);
+    }
+
+    /**
+     * @param context
+     * @param attrs
+     */
+    public BreadCrumbView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    /**
+     * @param context
+     */
+    public BreadCrumbView(Context context) {
+        super(context);
+        init(context);
+    }
+
+    private void init(Context ctx) {
+        mUseBackButton = false;
+        mCrumbs = new ArrayList<Crumb>();
+    }
+
+    public void setUseBackButton(boolean useflag) {
+        mUseBackButton = useflag;
+        if (mUseBackButton && (mBackButton == null)) {
+            addBackButton();
+        } else if (!mUseBackButton && (mBackButton != null)) {
+            removeView(mBackButton);
+            mBackButton = null;
+        }
+    }
+
+    public void setController(Controller ctl) {
+        mController = ctl;
+    }
+
+    public Object getTopData() {
+        Crumb c = getTopCrumb();
+        if (c != null) {
+            return c.data;
+        }
+        return null;
+    }
+
+    public int size() {
+        return mCrumbs.size();
+    }
+
+    public void clear() {
+        while (mCrumbs.size() > 1) {
+            pop(false);
+        }
+        pop(true);
+    }
+
+    public void notifyController() {
+        if (mController != null) {
+            if (mCrumbs.size() > 0) {
+                mController.onTop(mCrumbs.size(), getTopCrumb().data);
+            } else {
+                mController.onTop(0, null);
+            }
+        }
+    }
+
+    public void pushView(String name, Object data) {
+        Crumb crumb = new Crumb(name, true, data);
+        pushCrumb(crumb);
+    }
+
+    public void pushView(View view, Object data) {
+        Crumb crumb = new Crumb(view, true, data);
+        pushCrumb(crumb);
+    }
+
+    public void popView() {
+        pop(true);
+    }
+
+    private void addBackButton() {
+        mBackButton = new ImageButton(mContext);
+        mBackButton.setImageResource(R.drawable.ic_back_normal);
+        mBackButton.setBackgroundResource(R.drawable.browserbarbutton);
+        mBackButton.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
+                LayoutParams.MATCH_PARENT));
+        mBackButton.setOnClickListener(this);
+        mBackButton.setVisibility(View.GONE);
+        addView(mBackButton, 0);
+    }
+
+    private void pushCrumb(Crumb crumb) {
+        if (!mUseBackButton || (mCrumbs.size() > 0)) {
+            addSeparator();
+        }
+        mCrumbs.add(crumb);
+        addView(crumb.crumbView);
+        if (mUseBackButton) {
+            mBackButton.setVisibility(crumb.canGoBack ? View.VISIBLE : View.GONE);
+        }
+        crumb.crumbView.setOnClickListener(this);
+    }
+
+    private void addSeparator() {
+        ImageView sep = new ImageView(mContext);
+        sep.setImageResource(R.drawable.crumb_divider);
+        sep.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
+                LayoutParams.MATCH_PARENT));
+        addView(sep);
+    }
+
+    private void pop(boolean notify) {
+        int n = mCrumbs.size();
+        if (n > 0) {
+            removeLastView();
+            if (!mUseBackButton || (n > 1)) {
+                // remove separator
+                removeLastView();
+            }
+            mCrumbs.remove(n - 1);
+            if (mUseBackButton) {
+                Crumb top = getTopCrumb();
+                if (top != null) {
+                    mBackButton.setVisibility(top.canGoBack ? View.VISIBLE : View.GONE);
+                } else {
+                    mBackButton.setVisibility(View.GONE);
+                }
+            }
+            if (notify) {
+                notifyController();
+            }
+        }
+    }
+
+    private void removeLastView() {
+        int ix = getChildCount();
+        if (ix > 0) {
+            removeViewAt(ix-1);
+        }
+    }
+
+    private Crumb getTopCrumb() {
+        Crumb crumb = null;
+        if (mCrumbs.size() > 0) {
+            crumb = mCrumbs.get(mCrumbs.size() - 1);
+        }
+        return crumb;
+    }
+
+    @Override
+    public void onClick(View v) {
+        if (mBackButton == v) {
+            popView();
+            notifyController();
+        } else {
+            // pop until view matches crumb view
+            while (v != getTopCrumb().crumbView) {
+                pop(false);
+            }
+            notifyController();
+        }
+    }
+
+    class Crumb {
+
+        public View crumbView;
+        public boolean canGoBack;
+        public Object data;
+
+        public Crumb(String title, boolean backEnabled, Object tag) {
+            init(makeCrumbView(title), backEnabled, tag);
+        }
+
+        public Crumb(View view, boolean backEnabled, Object tag) {
+            init(view, backEnabled, tag);
+        }
+
+        private void init(View view, boolean back, Object tag) {
+            canGoBack = back;
+            crumbView = view;
+            data = tag;
+        }
+
+        private TextView makeCrumbView(String name) {
+            TextView tv = new TextView(mContext);
+            tv.setTextAppearance(mContext, android.R.style.TextAppearance_Medium);
+            tv.setPadding(16, 0, 16, 0);
+            tv.setGravity(Gravity.CENTER_VERTICAL);
+            tv.setText(name);
+            tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
+                    LayoutParams.MATCH_PARENT));
+            return tv;
+        }
+
+    }
+
+}