WebUsb Android chooser UI

chrome/android/java/src/org/chromium/chrome/browser/UsbChooserDialog.java

+// Copyright 2016 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.chrome.browser;
+
+import android.content.Context;
+import android.text.SpannableString;
+import android.text.TextUtils;
+import android.view.View;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.omnibox.OmniboxUrlEmphasizer;
+import org.chromium.chrome.browser.profiles.Profile;
+import org.chromium.ui.base.WindowAndroid;
+import org.chromium.ui.text.NoUnderlineClickableSpan;
+import org.chromium.ui.text.SpanApplier;
+import org.chromium.ui.text.SpanApplier.SpanInfo;
+
+/**
+ * A dialog for showing available USB devices. This dialog is shown when a website requests to
+ * connect to a USB device (e.g. through a usb.requestDevice Javascript call).
+ */
+public class UsbChooserDialog implements ItemChooserDialog.ItemSelectedCallback {
+    /**
+     * The dialog to show to let the user pick a device.
+     */
+    ItemChooserDialog mItemChooserDialog;
+
+    /**
+     * A pointer back to the native part of the implementation for this dialog.
+     */
+    long mNativeUsbChooserDialogPtr;
+
+    /**
+     * Creates the UsbChooserDialog.
+     */
+    private UsbChooserDialog(long nativeUsbChooserDialogPtr) {
+        mNativeUsbChooserDialogPtr = nativeUsbChooserDialogPtr;
+    }
+
+    /**
+     * Shows the UsbChooserDialog.
+     *
+     * @param context Context which is used for launching a dialog.
+     * @param origin The origin for the site wanting to connect to the USB device.
+     * @param securityLevel The security level of the connection to the site wanting to connect to
+     *                      the USB device. For valid values see SecurityStateModel::SecurityLevel.
+     */
+    private void show(Context context, String origin, int securityLevel) {
+        // Emphasize the origin.
+        Profile profile = Profile.getLastUsedProfile();
+        SpannableString originSpannableString = new SpannableString(origin);
+        OmniboxUrlEmphasizer.emphasizeUrl(originSpannableString, context.getResources(), profile,
+                securityLevel, false /* isInternalPage */, true /* useDarkColors */,
+                true /* emphasizeHttpsScheme */);
+        // Construct a full string and replace the origin text with emphasized version.
+        SpannableString title =
+                new SpannableString(context.getString(R.string.usb_chooser_dialog_prompt, origin));
+        int start = title.toString().indexOf(origin);
+        TextUtils.copySpansFrom(originSpannableString, 0, originSpannableString.length(),
+                Object.class, title, start);
+
+        String searching = "";
+        String noneFound = context.getString(R.string.usb_chooser_dialog_no_devices_found_prompt);
+        SpannableString statusIdleNoneFound = SpanApplier.applySpans(
+                context.getString(R.string.usb_chooser_dialog_footnote_text),
+                        new SpanInfo("<link>", "</link>", new NoUnderlineClickableSpan() {
+                            @Override
+                            public void onClick(View view) {
+                                if (mNativeUsbChooserDialogPtr == 0) {
+                                    return;
+                                }
+
+                                nativeLoadUsbHelpPage(mNativeUsbChooserDialogPtr);
+
+                                // Get rid of the highlight background on selection.
+                                view.invalidate();
+                            }
+                        }));
+        SpannableString statusIdleSomeFound = statusIdleNoneFound;
+        String positiveButton = context.getString(R.string.usb_chooser_dialog_connect_button_text);
+
+        ItemChooserDialog.ItemChooserLabels labels =
+                new ItemChooserDialog.ItemChooserLabels(title, searching, noneFound,
+                        statusIdleNoneFound, statusIdleSomeFound, positiveButton);
+        mItemChooserDialog = new ItemChooserDialog(context, this, labels);
+    }
+
+    @Override
+    public void onItemSelected(String id) {
+        if (mNativeUsbChooserDialogPtr != 0) {
+            if (id.isEmpty()) {
+                nativeOnDialogCancelled(mNativeUsbChooserDialogPtr);
+            } else {
+                nativeOnItemSelected(mNativeUsbChooserDialogPtr, id);
+            }
+        }
+    }
+
+    @CalledByNative
+    private static UsbChooserDialog create(WindowAndroid windowAndroid, String origin,
+            int securityLevel, long nativeUsbChooserDialogPtr) {
+        Context context = windowAndroid.getActivity().get();
+        if (context == null) {
+            return null;
+        }
+
+        UsbChooserDialog dialog = new UsbChooserDialog(nativeUsbChooserDialogPtr);
+        dialog.show(context, origin, securityLevel);
+        return dialog;
+    }
+
+    @CalledByNative
+    private void setIdleState() {
+        mItemChooserDialog.setIdleState();
+    }
+
+    @CalledByNative
+    private void addDevice(String deviceId, String deviceName) {
+        mItemChooserDialog.addItemToList(
+                new ItemChooserDialog.ItemChooserRow(deviceId, deviceName));
+    }
+
+    @CalledByNative
+    private void removeDevice(String deviceId, String deviceName) {
+        mItemChooserDialog.removeItemFromList(
+                new ItemChooserDialog.ItemChooserRow(deviceId, deviceName));
+    }
+
+    @CalledByNative
+    private void closeDialog() {
+        mNativeUsbChooserDialogPtr = 0;
+        mItemChooserDialog.dismiss();
+    }
+
+    private native void nativeOnItemSelected(long nativeUsbChooserDialogAndroid, String deviceId);
+    private native void nativeOnDialogCancelled(long nativeUsbChooserDialogAndroid);
+    private native void nativeLoadUsbHelpPage(long nativeUsbChooserDialogAndroid);
+}