Fixing focus issues in Launcher (keyboard support).

Change-Id: Ieafd713393daf5628f229a66441bd3ed293245da

1 files changed, 772 insertions, 0 deletions

diff --git a/src/com/android/launcher2/FocusHelper.java b/src/com/android/launcher2/FocusHelper.java
new file mode 100644
index 000000000..c9bd58cd0
--- /dev/null
+++ b/src/com/android/launcher2/FocusHelper.java
@@ -0,0 +1,772 @@
+/*
+ * Copyright (C) 2011 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.launcher2;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewParent;
+import android.widget.TabHost;
+import android.widget.TabWidget;
+
+import com.android.launcher.R;
+
+/**
+ * A keyboard listener we set on all the button bar buttons.
+ */
+class ButtonBarKeyEventListener implements View.OnKeyListener {
+    @Override
+    public boolean onKey(View v, int keyCode, KeyEvent event) {
+        return FocusHelper.handleButtonBarButtonKeyEvent(v, keyCode, event);
+    }
+}
+
+/**
+ * A keyboard listener we set on the last tab button in AllApps to jump to then
+ * market icon and vice versa.
+ */
+class AllAppsTabKeyEventListener implements View.OnKeyListener {
+    @Override
+    public boolean onKey(View v, int keyCode, KeyEvent event) {
+        return FocusHelper.handleAllAppsTabKeyEvent(v, keyCode, event);
+    }
+}
+
+public class FocusHelper {
+    /**
+     * Private helper to get the parent TabHost in the view hiearchy.
+     */
+    private static TabHost findTabHostParent(View v) {
+        ViewParent p = v.getParent();
+        while (p != null && !(p instanceof TabHost)) {
+            p = p.getParent();
+        }
+        return (TabHost) p;
+    }
+
+    /**
+     * Handles key events in a AllApps tab between the last tab view and the shop button.
+     */
+    static boolean handleAllAppsTabKeyEvent(View v, int keyCode, KeyEvent e) {
+        final TabHost tabHost = findTabHostParent(v);
+        final ViewGroup contents = (ViewGroup)
+                tabHost.findViewById(com.android.internal.R.id.tabcontent);
+        final View shop = tabHost.findViewById(R.id.market_button);
+
+        final int action = e.getAction();
+        final boolean handleKeyEvent = (action != KeyEvent.ACTION_UP);
+        boolean wasHandled = false;
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_RIGHT:
+                if (handleKeyEvent) {
+                    // Select the shop button if we aren't on it
+                    if (v != shop) {
+                        shop.requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+                if (handleKeyEvent) {
+                    // Select the content view (down is handled by the tab key handler otherwise)
+                    if (v == shop) {
+                        contents.requestFocus();
+                        wasHandled = true;
+                    }
+                }
+                break;
+            default: break;
+        }
+        return wasHandled;
+    }
+
+    /**
+     * Private helper to determine whether a view is visible.
+     */
+    private static boolean isVisible(View v) {
+        return v.getVisibility() == View.VISIBLE;
+    }
+
+    /**
+     * Handles key events in a PageViewExtendedLayout containing PagedViewWidgets.
+     */
+    static boolean handlePagedViewWidgetKeyEvent(PagedViewWidget w, int keyCode, KeyEvent e) {
+        if (!LauncherApplication.isScreenXLarge()) return false;
+
+        final PagedViewExtendedLayout parent = (PagedViewExtendedLayout) w.getParent();
+        final ViewGroup container = (ViewGroup) parent.getParent();
+        final TabHost tabHost = findTabHostParent(container);
+        final TabWidget tabs = (TabWidget) tabHost.findViewById(com.android.internal.R.id.tabs);
+        final int widgetIndex = parent.indexOfChild(w);
+        final int widgetCount = parent.getChildCount();
+        final int pageIndex = container.indexOfChild(parent);
+        final int pageCount = container.getChildCount();
+
+        final int action = e.getAction();
+        final boolean handleKeyEvent = (action != KeyEvent.ACTION_UP);
+        PagedViewExtendedLayout newParent = null;
+        boolean wasHandled = false;
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_LEFT:
+                if (handleKeyEvent) {
+                    // Select the previous widget or the last widget on the previous page
+                    if (widgetIndex > 0) {
+                        parent.getChildAt(widgetIndex - 1).requestFocus();
+                    } else {
+                        if (pageIndex > 0) {
+                            newParent = (PagedViewExtendedLayout)
+                                    container.getChildAt(pageIndex - 1);
+                            newParent.getChildAt(newParent.getChildCount() - 1).requestFocus();
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_RIGHT:
+                if (handleKeyEvent) {
+                    // Select the next widget or the first widget on the next page
+                    if (widgetIndex < (widgetCount - 1)) {
+                        parent.getChildAt(widgetIndex + 1).requestFocus();
+                    } else {
+                        if (pageIndex < (pageCount - 1)) {
+                            newParent = (PagedViewExtendedLayout)
+                                    container.getChildAt(pageIndex + 1);
+                            newParent.getChildAt(0).requestFocus();
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_UP:
+                if (handleKeyEvent) {
+                    // Select widgets tab on the tab bar
+                    tabs.requestFocus();
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+                if (handleKeyEvent) {
+                    // TODO: Should focus the global search bar
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_ENTER:
+            case KeyEvent.KEYCODE_DPAD_CENTER:
+                if (handleKeyEvent) {
+                    // Simulate a click on the widget
+                    View.OnClickListener clickListener = (View.OnClickListener) container;
+                    clickListener.onClick(w);
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_PAGE_UP:
+                if (handleKeyEvent) {
+                    // Select the first item on the previous page, or the first item on this page
+                    // if there is no previous page
+                    if (pageIndex > 0) {
+                        newParent = (PagedViewExtendedLayout) container.getChildAt(pageIndex - 1);
+                        newParent.getChildAt(0).requestFocus();
+                    } else {
+                        parent.getChildAt(0).requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_PAGE_DOWN:
+                if (handleKeyEvent) {
+                    // Select the first item on the next page, or the last item on this page
+                    // if there is no next page
+                    if (pageIndex < (pageCount - 1)) {
+                        newParent = (PagedViewExtendedLayout) container.getChildAt(pageIndex + 1);
+                        newParent.getChildAt(0).requestFocus();
+                    } else {
+                        parent.getChildAt(widgetCount - 1).requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_MOVE_HOME:
+                if (handleKeyEvent) {
+                    // Select the first item on this page
+                    parent.getChildAt(0).requestFocus();
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_MOVE_END:
+                if (handleKeyEvent) {
+                    // Select the last item on this page
+                    parent.getChildAt(widgetCount - 1).requestFocus();
+                }
+                wasHandled = true;
+                break;
+            default: break;
+        }
+        return wasHandled;
+    }
+
+    /**
+     * Private helper method to get the PagedViewCellLayoutChildren given a PagedViewCellLayout
+     * index.
+     */
+    private static PagedViewCellLayoutChildren getPagedViewCellLayoutChildrenForIndex(
+            ViewGroup container, int i) {
+        ViewGroup parent = (ViewGroup) container.getChildAt(i);
+        return (PagedViewCellLayoutChildren) parent.getChildAt(0);
+    }
+
+    /**
+     * Handles key events in a PageViewCellLayout containing PagedViewIcons.
+     */
+    static boolean handlePagedViewIconKeyEvent(PagedViewIcon v, int keyCode, KeyEvent e) {
+        if (!LauncherApplication.isScreenXLarge()) return false;
+
+        final PagedViewCellLayoutChildren parent = (PagedViewCellLayoutChildren) v.getParent();
+        final PagedViewCellLayout parentLayout = (PagedViewCellLayout) parent.getParent();
+        // Note we have an extra parent because of the
+        // PagedViewCellLayout/PagedViewCellLayoutChildren relationship
+        final ViewGroup container = (ViewGroup) parentLayout.getParent();
+        final TabHost tabHost = findTabHostParent(container);
+        final TabWidget tabs = (TabWidget) tabHost.findViewById(com.android.internal.R.id.tabs);
+        final int widgetIndex = parent.indexOfChild(v);
+        final int widgetCount = parent.getChildCount();
+        final int pageIndex = container.indexOfChild(parentLayout);
+        final int pageCount = container.getChildCount();
+        final int cellCountX = parentLayout.getCellCountX();
+        final int cellCountY = parentLayout.getCellCountY();
+        final int x = widgetIndex % cellCountX;
+        final int y = widgetIndex / cellCountX;
+
+        final int action = e.getAction();
+        final boolean handleKeyEvent = (action != KeyEvent.ACTION_UP);
+        PagedViewCellLayoutChildren newParent = null;
+        boolean wasHandled = false;
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_LEFT:
+                if (handleKeyEvent) {
+                    // Select the previous icon or the last icon on the previous page
+                    if (widgetIndex > 0) {
+                        parent.getChildAt(widgetIndex - 1).requestFocus();
+                    } else {
+                        if (pageIndex > 0) {
+                            newParent = getPagedViewCellLayoutChildrenForIndex(container,
+                                    pageIndex - 1);
+                            newParent.getChildAt(newParent.getChildCount() - 1).requestFocus();
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_RIGHT:
+                if (handleKeyEvent) {
+                    // Select the next icon or the first icon on the next page
+                    if (widgetIndex < (widgetCount - 1)) {
+                        parent.getChildAt(widgetIndex + 1).requestFocus();
+                    } else {
+                        if (pageIndex < (pageCount - 1)) {
+                            newParent = getPagedViewCellLayoutChildrenForIndex(container,
+                                    pageIndex + 1);
+                            newParent.getChildAt(0).requestFocus();
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_UP:
+                if (handleKeyEvent) {
+                    // Select the closest icon in the previous row, otherwise select the tab bar
+                    if (y > 0) {
+                        int newWidgetIndex = ((y - 1) * cellCountX) + x;
+                        parent.getChildAt(newWidgetIndex).requestFocus();
+                    } else {
+                        tabs.requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+                if (handleKeyEvent) {
+                    // Select the closest icon in the previous row, otherwise do nothing
+                    if (y < (cellCountY - 1)) {
+                        int newWidgetIndex = Math.min(widgetCount - 1, ((y + 1) * cellCountX) + x);
+                        parent.getChildAt(newWidgetIndex).requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_ENTER:
+            case KeyEvent.KEYCODE_DPAD_CENTER:
+                if (handleKeyEvent) {
+                    // Simulate a click on the icon
+                    View.OnClickListener clickListener = (View.OnClickListener) container;
+                    clickListener.onClick(v);
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_PAGE_UP:
+                if (handleKeyEvent) {
+                    // Select the first icon on the previous page, or the first icon on this page
+                    // if there is no previous page
+                    if (pageIndex > 0) {
+                        newParent = getPagedViewCellLayoutChildrenForIndex(container,
+                                pageIndex - 1);
+                        newParent.getChildAt(0).requestFocus();
+                    } else {
+                        parent.getChildAt(0).requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_PAGE_DOWN:
+                if (handleKeyEvent) {
+                    // Select the first icon on the next page, or the last icon on this page
+                    // if there is no next page
+                    if (pageIndex < (pageCount - 1)) {
+                        newParent = getPagedViewCellLayoutChildrenForIndex(container,
+                                pageIndex + 1);
+                        newParent.getChildAt(0).requestFocus();
+                    } else {
+                        parent.getChildAt(widgetCount - 1).requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_MOVE_HOME:
+                if (handleKeyEvent) {
+                    // Select the first icon on this page
+                    parent.getChildAt(0).requestFocus();
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_MOVE_END:
+                if (handleKeyEvent) {
+                    // Select the last icon on this page
+                    parent.getChildAt(widgetCount - 1).requestFocus();
+                }
+                wasHandled = true;
+                break;
+            default: break;
+        }
+        return wasHandled;
+    }
+
+    /**
+     * Handles key events in the tab widget.
+     */
+    static boolean handleTabKeyEvent(AccessibleTabView v, int keyCode, KeyEvent e) {
+        if (!LauncherApplication.isScreenXLarge()) return false;
+
+        final FocusOnlyTabWidget parent = (FocusOnlyTabWidget) v.getParent();
+        final TabHost tabHost = findTabHostParent(parent);
+        final ViewGroup contents = (ViewGroup)
+                tabHost.findViewById(com.android.internal.R.id.tabcontent);
+        final int tabCount = parent.getTabCount();
+        final int tabIndex = parent.getChildTabIndex(v);
+
+        final int action = e.getAction();
+        final boolean handleKeyEvent = (action != KeyEvent.ACTION_UP);
+        boolean wasHandled = false;
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_LEFT:
+                if (handleKeyEvent) {
+                    // Select the previous tab
+                    if (tabIndex > 0) {
+                        parent.getChildTabViewAt(tabIndex - 1).requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_RIGHT:
+                if (handleKeyEvent) {
+                    // Select the next tab, or if the last tab has a focus right id, select that
+                    if (tabIndex < (tabCount - 1)) {
+                        parent.getChildTabViewAt(tabIndex + 1).requestFocus();
+                    } else {
+                        if (v.getNextFocusRightId() != View.NO_ID) {
+                            tabHost.findViewById(v.getNextFocusRightId()).requestFocus();
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_UP:
+                // Do nothing
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+                if (handleKeyEvent) {
+                    // Select the content view
+                    contents.requestFocus();
+                }
+                wasHandled = true;
+                break;
+            default: break;
+        }
+        return wasHandled;
+    }
+
+    /**
+     * Handles key events in a the workspace button bar.
+     */
+    static boolean handleButtonBarButtonKeyEvent(View v, int keyCode, KeyEvent e) {
+        if (!LauncherApplication.isScreenXLarge()) return false;
+
+        final ViewGroup parent = (ViewGroup) v.getParent();
+        final ViewGroup launcher = (ViewGroup) parent.getParent();
+        final Workspace workspace = (Workspace) launcher.findViewById(R.id.workspace);
+        final int buttonIndex = parent.indexOfChild(v);
+        final int buttonCount = parent.getChildCount();
+        final int pageIndex = workspace.getCurrentPage();
+        final int pageCount = workspace.getChildCount();
+        final int firstButtonIndex = parent.indexOfChild(parent.findViewById(R.id.search_button));
+        final int lastButtonIndex = parent.indexOfChild(parent.findViewById(R.id.configure_button));
+
+        final int action = e.getAction();
+        final boolean handleKeyEvent = (action != KeyEvent.ACTION_UP);
+        boolean wasHandled = false;
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_LEFT:
+                if (handleKeyEvent) {
+                    // Select the previous button, otherwise do nothing (since the button bar is
+                    // static)
+                    if (buttonIndex > firstButtonIndex) {
+                        int newButtonIndex = buttonIndex - 1;
+                        while (newButtonIndex >= firstButtonIndex) {
+                            View prev = parent.getChildAt(newButtonIndex);
+                            if (isVisible(prev) && prev.isFocusable()) {
+                                prev.requestFocus();
+                                break;
+                            }
+                            --newButtonIndex;
+                        }
+                    } else {
+                        if (pageIndex > 0) {
+                            // Snap to previous page and clear focus
+                            workspace.snapToPage(pageIndex - 1);
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_RIGHT:
+                if (handleKeyEvent) {
+                    // Select the next button, otherwise do nothing (since the button bar is
+                    // static)
+                    if (buttonIndex < lastButtonIndex) {
+                        int newButtonIndex = buttonIndex + 1;
+                        while (newButtonIndex <= lastButtonIndex) {
+                            View next = parent.getChildAt(newButtonIndex);
+                            if (isVisible(next) && next.isFocusable()) {
+                                next.requestFocus();
+                                break;
+                            }
+                            ++newButtonIndex;
+                        }
+                    } else {
+                        if (pageIndex < (pageCount - 1)) {
+                            // Snap to next page and clear focus
+                            workspace.snapToPage(pageIndex + 1);
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_UP:
+                // Do nothing
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+                if (handleKeyEvent) {
+                    // Select the first bubble text view in the current page of the workspace
+                    final CellLayout layout = (CellLayout) workspace.getChildAt(pageIndex);
+                    final CellLayoutChildren children = layout.getChildrenLayout();
+                    final View newIcon = getBubbleTextViewInDirection(layout, children, -1, 1);
+                    if (newIcon != null) {
+                        newIcon.requestFocus();
+                    } else {
+                        workspace.requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            default: break;
+        }
+        return wasHandled;
+    }
+
+    /**
+     * Private helper method to get the CellLayoutChildren given a CellLayout index.
+     */
+    private static CellLayoutChildren getCellLayoutChildrenForIndex(ViewGroup container, int i) {
+        ViewGroup parent = (ViewGroup) container.getChildAt(i);
+        return (CellLayoutChildren) parent.getChildAt(0);
+    }
+
+    /**
+     * Private helper method to sort all the CellLayout children in order of their (x,y) spatially
+     * from top left to bottom right.
+     */
+    private static ArrayList<View> getCellLayoutChildrenSortedSpatially(CellLayout layout,
+            ViewGroup parent) {
+        // First we order each the CellLayout children by their x,y coordinates
+        final int cellCountX = layout.getCountX();
+        final int count = parent.getChildCount();
+        ArrayList<View> views = new ArrayList<View>();
+        for (int j = 0; j < count; ++j) {
+            views.add(parent.getChildAt(j));
+        }
+        Collections.sort(views, new Comparator<View>() {
+            @Override
+            public int compare(View lhs, View rhs) {
+                CellLayout.LayoutParams llp = (CellLayout.LayoutParams) lhs.getLayoutParams();
+                CellLayout.LayoutParams rlp = (CellLayout.LayoutParams) rhs.getLayoutParams();
+                int lvIndex = (llp.cellY * cellCountX) + llp.cellX;
+                int rvIndex = (rlp.cellY * cellCountX) + rlp.cellX;
+                return lvIndex - rvIndex;
+            }
+        });
+        return views;
+    }
+    /**
+     * Private helper method to find the index of the next BubbleTextView in the delta direction.
+     * @param delta either -1 or 1 depending on the direction we want to search
+     */
+    private static View findIndexOfBubbleTextView(ArrayList<View> views, int i, int delta) {
+        // Then we find the next BubbleTextView offset by delta from i
+        final int count = views.size();
+        int newI = i + delta;
+        while (0 <= newI && newI < count) {
+            View newV = views.get(newI);
+            if (newV instanceof BubbleTextView) {
+                return newV;
+            }
+            newI += delta;
+        }
+        return null;
+    }
+    private static View getBubbleTextViewInDirection(CellLayout layout, ViewGroup parent, int i,
+            int delta) {
+        final ArrayList<View> views = getCellLayoutChildrenSortedSpatially(layout, parent);
+        return findIndexOfBubbleTextView(views, i, delta);
+    }
+    private static View getBubbleTextViewInDirection(CellLayout layout, ViewGroup parent, View v,
+            int delta) {
+        final ArrayList<View> views = getCellLayoutChildrenSortedSpatially(layout, parent);
+        return findIndexOfBubbleTextView(views, views.indexOf(v), delta);
+    }
+    /**
+     * Private helper method to find the next closest BubbleTextView in the delta direction on the
+     * next line.
+     * @param delta either -1 or 1 depending on the line and direction we want to search
+     */
+    private static View getClosestBubbleTextViewOnLine(CellLayout layout, ViewGroup parent, View v,
+            int lineDelta) {
+        final ArrayList<View> views = getCellLayoutChildrenSortedSpatially(layout, parent);
+        final CellLayout.LayoutParams lp = (CellLayout.LayoutParams) v.getLayoutParams();
+        final int cellCountX = layout.getCountX();
+        final int cellCountY = layout.getCountY();
+        final int row = lp.cellY;
+        final int newRow = row + lineDelta;
+        if (0 <= newRow && newRow < cellCountY) {
+            float closestDistance = Float.MAX_VALUE;
+            int closestIndex = -1;
+            int index = views.indexOf(v);
+            int endIndex = (lineDelta < 0) ? -1 : views.size();
+            while (index != endIndex) {
+                View newV = views.get(index);
+                CellLayout.LayoutParams tmpLp = (CellLayout.LayoutParams) newV.getLayoutParams();
+                boolean satisfiesRow = (lineDelta < 0) ? (tmpLp.cellY < row) : (tmpLp.cellY > row);
+                if (satisfiesRow && newV instanceof BubbleTextView) {
+                    float tmpDistance = (float) Math.sqrt(Math.pow(tmpLp.cellX - lp.cellX, 2) +
+                            Math.pow(tmpLp.cellY - lp.cellY, 2));
+                    if (tmpDistance < closestDistance) {
+                        closestIndex = index;
+                        closestDistance = tmpDistance;
+                    }
+                }
+                if (index <= endIndex) {
+                    ++index;
+                } else {
+                    --index;
+                }
+            }
+            if (closestIndex > -1) {
+                return views.get(closestIndex);
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Handles key events in a Workspace containing BubbleTextView.
+     */
+    static boolean handleBubbleTextViewKeyEvent(BubbleTextView v, int keyCode, KeyEvent e) {
+        if (!LauncherApplication.isScreenXLarge()) return false;
+
+        CellLayoutChildren parent = (CellLayoutChildren) v.getParent();
+        final CellLayout layout = (CellLayout) parent.getParent();
+        final Workspace workspace = (Workspace) layout.getParent();
+        final ViewGroup launcher = (ViewGroup) workspace.getParent();
+        final ViewGroup tabs = (ViewGroup) launcher.findViewById(R.id.all_apps_button_cluster);
+        int iconIndex = parent.indexOfChild(v);
+        int iconCount = parent.getChildCount();
+        int pageIndex = workspace.indexOfChild(layout);
+        int pageCount = workspace.getChildCount();
+
+        final int action = e.getAction();
+        final boolean handleKeyEvent = (action != KeyEvent.ACTION_UP);
+        boolean wasHandled = false;
+        switch (keyCode) {
+            case KeyEvent.KEYCODE_DPAD_LEFT:
+                if (handleKeyEvent) {
+                    // Select the previous icon or the last icon on the previous page if possible
+                    View newIcon = getBubbleTextViewInDirection(layout, parent, v, -1);
+                    if (newIcon != null) {
+                        newIcon.requestFocus();
+                    } else {
+                        if (pageIndex > 0) {
+                            parent = getCellLayoutChildrenForIndex(workspace, pageIndex - 1);
+                            newIcon = getBubbleTextViewInDirection(layout, parent,
+                                    parent.getChildCount(), -1);
+                            if (newIcon != null) {
+                                newIcon.requestFocus();
+                            } else {
+                                // Snap to the previous page
+                                workspace.snapToPage(pageIndex - 1);
+                            }
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_RIGHT:
+                if (handleKeyEvent) {
+                    // Select the next icon or the first icon on the next page if possible
+                    View newIcon = getBubbleTextViewInDirection(layout, parent, v, 1);
+                    if (newIcon != null) {
+                        newIcon.requestFocus();
+                    } else {
+                        if (pageIndex < (pageCount - 1)) {
+                            parent = getCellLayoutChildrenForIndex(workspace, pageIndex + 1);
+                            newIcon = getBubbleTextViewInDirection(layout, parent, -1, 1);
+                            if (newIcon != null) {
+                                newIcon.requestFocus();
+                            } else {
+                                // Snap to the next page
+                                workspace.snapToPage(pageIndex + 1);
+                            }
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_DPAD_UP:
+                if (handleKeyEvent) {
+                    // Select the closest icon in the previous line, otherwise select the tab bar
+                    View newIcon = getClosestBubbleTextViewOnLine(layout, parent, v, -1);
+                    if (newIcon != null) {
+                        newIcon.requestFocus();
+                        wasHandled = true;
+                    } else {
+                        tabs.requestFocus();
+                    }
+                }
+                break;
+            case KeyEvent.KEYCODE_DPAD_DOWN:
+                if (handleKeyEvent) {
+                    // Select the closest icon in the next line, otherwise select the tab bar
+                    View newIcon = getClosestBubbleTextViewOnLine(layout, parent, v, 1);
+                    if (newIcon != null) {
+                        newIcon.requestFocus();
+                        wasHandled = true;
+                    }
+                }
+                break;
+            case KeyEvent.KEYCODE_PAGE_UP:
+                if (handleKeyEvent) {
+                    // Select the first icon on the previous page or the first icon on this page
+                    // if there is no previous page
+                    if (pageIndex > 0) {
+                        parent = getCellLayoutChildrenForIndex(workspace, pageIndex - 1);
+                        View newIcon = getBubbleTextViewInDirection(layout, parent, -1, 1);
+                        if (newIcon != null) {
+                            newIcon.requestFocus();
+                        } else {
+                            // Snap to the previous page
+                            workspace.snapToPage(pageIndex - 1);
+                        }
+                    } else {
+                        View newIcon = getBubbleTextViewInDirection(layout, parent, -1, 1);
+                        if (newIcon != null) {
+                            newIcon.requestFocus();
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_PAGE_DOWN:
+                if (handleKeyEvent) {
+                    // Select the first icon on the next page or the last icon on this page
+                    // if there is no previous page
+                    if (pageIndex < (pageCount - 1)) {
+                        parent = getCellLayoutChildrenForIndex(workspace, pageIndex + 1);
+                        View newIcon = getBubbleTextViewInDirection(layout, parent, -1, 1);
+                        if (newIcon != null) {
+                            newIcon.requestFocus();
+                        } else {
+                            // Snap to the next page
+                            workspace.snapToPage(pageIndex + 1);
+                        }
+                    } else {
+                        View newIcon = getBubbleTextViewInDirection(layout, parent,
+                                parent.getChildCount(), -1);
+                        if (newIcon != null) {
+                            newIcon.requestFocus();
+                        }
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_MOVE_HOME:
+                if (handleKeyEvent) {
+                    // Select the first icon on this page
+                    View newIcon = getBubbleTextViewInDirection(layout, parent, -1, 1);
+                    if (newIcon != null) {
+                        newIcon.requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            case KeyEvent.KEYCODE_MOVE_END:
+                if (handleKeyEvent) {
+                    // Select the last icon on this page
+                    View newIcon = getBubbleTextViewInDirection(layout, parent,
+                            parent.getChildCount(), -1);
+                    if (newIcon != null) {
+                        newIcon.requestFocus();
+                    }
+                }
+                wasHandled = true;
+                break;
+            default: break;
+        }
+        return wasHandled;
+    }
+}