1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package android.webkit; 17 18 import android.view.Gravity; 19 import android.view.View; 20 import android.view.ViewGroup; 21 import android.widget.FrameLayout; 22 import android.widget.Toast; 23 import android.widget.ZoomButtonsController; 24 25 class ZoomControlEmbedded implements ZoomControlBase { 26 27 private final ZoomManager mZoomManager; 28 private final WebViewClassic mWebView; 29 30 // The controller is lazily initialized in getControls() for performance. 31 private ZoomButtonsController mZoomButtonsController; 32 33 public ZoomControlEmbedded(ZoomManager zoomManager, WebViewClassic webView) { 34 mZoomManager = zoomManager; 35 mWebView = webView; 36 } 37 38 public void show() { 39 if (!getControls().isVisible() && !mZoomManager.isZoomScaleFixed()) { 40 41 mZoomButtonsController.setVisible(true); 42 43 if (mZoomManager.isDoubleTapEnabled()) { 44 WebSettingsClassic settings = mWebView.getSettings(); 45 int count = settings.getDoubleTapToastCount(); 46 if (mZoomManager.isInZoomOverview() && count > 0) { 47 settings.setDoubleTapToastCount(--count); 48 Toast.makeText(mWebView.getContext(), 49 com.android.internal.R.string.double_tap_toast, 50 Toast.LENGTH_LONG).show(); 51 } 52 } 53 } 54 } 55 56 public void hide() { 57 if (mZoomButtonsController != null) { 58 mZoomButtonsController.setVisible(false); 59 } 60 } 61 62 public boolean isVisible() { 63 return mZoomButtonsController != null && mZoomButtonsController.isVisible(); 64 } 65 66 public void update() { 67 if (mZoomButtonsController == null) { 68 return; 69 } 70 71 boolean canZoomIn = mZoomManager.canZoomIn(); 72 boolean canZoomOut = mZoomManager.canZoomOut() && !mZoomManager.isInZoomOverview(); 73 if (!canZoomIn && !canZoomOut) { 74 // Hide the zoom in and out buttons if the page cannot zoom 75 mZoomButtonsController.getZoomControls().setVisibility(View.GONE); 76 } else { 77 // Set each one individually, as a page may be able to zoom in or out 78 mZoomButtonsController.setZoomInEnabled(canZoomIn); 79 mZoomButtonsController.setZoomOutEnabled(canZoomOut); 80 } 81 } 82 83 private ZoomButtonsController getControls() { 84 if (mZoomButtonsController == null) { 85 mZoomButtonsController = new ZoomButtonsController(mWebView.getWebView()); 86 mZoomButtonsController.setOnZoomListener(new ZoomListener()); 87 // ZoomButtonsController positions the buttons at the bottom, but in 88 // the middle. Change their layout parameters so they appear on the 89 // right. 90 View controls = mZoomButtonsController.getZoomControls(); 91 ViewGroup.LayoutParams params = controls.getLayoutParams(); 92 if (params instanceof FrameLayout.LayoutParams) { 93 ((FrameLayout.LayoutParams) params).gravity = Gravity.END; 94 } 95 } 96 return mZoomButtonsController; 97 } 98 99 private class ZoomListener implements ZoomButtonsController.OnZoomListener { 100 101 public void onVisibilityChanged(boolean visible) { 102 if (visible) { 103 mWebView.switchOutDrawHistory(); 104 // Bring back the hidden zoom controls. 105 mZoomButtonsController.getZoomControls().setVisibility(View.VISIBLE); 106 update(); 107 } 108 } 109 110 public void onZoom(boolean zoomIn) { 111 if (zoomIn) { 112 mWebView.zoomIn(); 113 } else { 114 mWebView.zoomOut(); 115 } 116 update(); 117 } 118 } 119 } 120