| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| package org.chromium.ui; |
| |
| import android.content.Context; |
| import android.graphics.Rect; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.inputmethod.InputMethodManager; |
| |
| /** |
| * Utility functions for common Android UI tasks. |
| * This class is not supposed to be instantiated. |
| */ |
| public class UiUtils { |
| /** |
| * Guards this class from being instantiated. |
| */ |
| private UiUtils() { |
| } |
| |
| /** The minimum size of the bottom margin below the app to detect a keyboard. */ |
| private static float KEYBOARD_DETECT_BOTTOM_THRESHOLD_DP = 100; |
| |
| /** |
| * Shows the software keyboard if necessary. |
| * @param view The currently focused {@link View}, which would receive soft keyboard input. |
| */ |
| public static void showKeyboard(View view) { |
| InputMethodManager imm = |
| (InputMethodManager) view.getContext().getSystemService( |
| Context.INPUT_METHOD_SERVICE); |
| // Only shows soft keyboard if there isn't an open physical keyboard. |
| imm.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT); |
| } |
| |
| /** |
| * Hides the keyboard. |
| * @param view The {@link View} that is currently accepting input. |
| * @return Whether the keyboard was visible before. |
| */ |
| public static boolean hideKeyboard(View view) { |
| InputMethodManager imm = |
| (InputMethodManager) view.getContext().getSystemService( |
| Context.INPUT_METHOD_SERVICE); |
| return imm.hideSoftInputFromWindow(view.getWindowToken(), 0); |
| } |
| |
| public static boolean isKeyboardShowing(Context context, View view) { |
| View rootView = view.getRootView(); |
| if (rootView == null) return false; |
| Rect appRect = new Rect(); |
| rootView.getWindowVisibleDisplayFrame(appRect); |
| final float screenHeight = context.getResources().getDisplayMetrics().heightPixels; |
| final float bottomMargin = Math.abs(appRect.bottom - screenHeight); |
| final float density = context.getResources().getDisplayMetrics().density; |
| return bottomMargin > KEYBOARD_DETECT_BOTTOM_THRESHOLD_DP * density; |
| } |
| |
| /** |
| * Inserts a {@link View} into a {@link ViewGroup} after directly before a given {@View}. |
| * @param container The {@link View} to add newView to. |
| * @param newView The new {@link View} to add. |
| * @param existingView The {@link View} to insert the newView before. |
| * @return The index where newView was inserted, or -1 if it was not inserted. |
| */ |
| public static int insertBefore(ViewGroup container, View newView, View existingView) { |
| return insertView(container, newView, existingView, false); |
| } |
| |
| /** |
| * Inserts a {@link View} into a {@link ViewGroup} after directly after a given {@View}. |
| * @param container The {@link View} to add newView to. |
| * @param newView The new {@link View} to add. |
| * @param existingView The {@link View} to insert the newView after. |
| * @return The index where newView was inserted, or -1 if it was not inserted. |
| */ |
| public static int insertAfter(ViewGroup container, View newView, View existingView) { |
| return insertView(container, newView, existingView, true); |
| } |
| |
| private static int insertView( |
| ViewGroup container, View newView, View existingView, boolean after) { |
| // See if the view has already been added. |
| int index = container.indexOfChild(newView); |
| if (index >= 0) return index; |
| |
| // Find the location of the existing view. |
| index = container.indexOfChild(existingView); |
| if (index < 0) return -1; |
| |
| // Add the view. |
| if (after) index++; |
| container.addView(newView, index); |
| return index; |
| } |
| } |