WebUsb Android chooser UI

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

Index: chrome/android/java/src/org/chromium/chrome/browser/UsbChooserDialog.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/UsbChooserDialog.java b/chrome/android/java/src/org/chromium/chrome/browser/UsbChooserDialog.java
new file mode 100644
index 0000000000000000000000000000000000000000..4c1b26529173dfa28c3f09621127675871f7a0f0
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/UsbChooserDialog.java
@@ -0,0 +1,151 @@
+// 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;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 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 {
+    // Values passed to nativeOnDialogFinished:eventType, and only used in the native function.
+    private static final int DIALOG_FINISHED_CANCELLED = 0;
+    private static final int DIALOG_FINISHED_SELECTED = 1;
+
+    // The window that owns this dialog.
+    final WindowAndroid mWindowAndroid;

[Finnur, 2016/03/14 11:36:49]

Since this is a derivative of the Bluetooth chooser, can you make the same
changes there, if possible? 

+
+    // 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 and displays it (and starts waiting for data).
+     *
+     * @param context Context which is used for launching a dialog.
+     */
+    private UsbChooserDialog(WindowAndroid windowAndroid, long nativeUsbChooserDialogPtr) {
+        mWindowAndroid = windowAndroid;
+        mNativeUsbChooserDialogPtr = nativeUsbChooserDialogPtr;
+    }
+
+    /**
+     * Show the UsbChooserDialog.
+     *
+     * @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(String origin, int securityLevel) {
+        Context context = mWindowAndroid.getActivity().get();
+        assert context != null;
+        // 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);
+
+        SpannableString searching = new SpannableString(new String(""));
+        SpannableString noneFound = new SpannableString(
+                context.getString(R.string.usb_chooser_dialog_no_devices_found_prompt));
+        SpannableString statusActive =
+                SpanApplier.applySpans(context.getString(R.string.usb_chooser_dialog_footnote_text),
+                        new SpanInfo("<link>", "</link>", new UsbNoUnderlineClickableSpan()));
+        SpannableString statusIdleNoneFound = statusActive;
+        SpannableString statusIdleSomeFound = statusActive;
+        String positiveButton = context.getString(R.string.usb_chooser_dialog_connect_button_text);
+
+        ItemChooserDialog.ItemChooserLabels labels =
+                new ItemChooserDialog.ItemChooserLabels(title, searching, noneFound, statusActive,
+                        statusIdleNoneFound, statusIdleSomeFound, positiveButton);
+        mItemChooserDialog = new ItemChooserDialog(context, this, labels);
+    }
+
+    @Override
+    public void onItemSelected(String id) {
+        if (mNativeUsbChooserDialogPtr != 0) {
+            if (id.isEmpty()) {
+                nativeOnDialogFinished(mNativeUsbChooserDialogPtr, DIALOG_FINISHED_CANCELLED, "");
+            } else {
+                nativeOnDialogFinished(mNativeUsbChooserDialogPtr, DIALOG_FINISHED_SELECTED, id);
+            }
+        }
+    }
+
+    private class UsbNoUnderlineClickableSpan extends NoUnderlineClickableSpan {
+        @Override
+        public void onClick(View view) {
+            if (mNativeUsbChooserDialogPtr == 0) {
+                return;
+            }
+
+            nativeShowUsbOverviewLink(mNativeUsbChooserDialogPtr);
+
+            super.onClick(view);
+        }
+    }
+
+    @CalledByNative
+    private static UsbChooserDialog create(WindowAndroid windowAndroid, String origin,
+            int securityLevel, long nativeUsbChooserDialogPtr) {
+        UsbChooserDialog dialog = new UsbChooserDialog(windowAndroid, nativeUsbChooserDialogPtr);
+        dialog.show(origin, securityLevel);
+        return dialog;
+    }
+
+    @CalledByNative
+    private void addDevices(String[] deviceIds, String[] deviceNames) {
+        mItemChooserDialog.clear();
+        int len = deviceIds.length;
+        if (len == 0) {
+            mItemChooserDialog.setIdleState();
+            return;
+        }
+
+        List<ItemChooserDialog.ItemChooserRow> devices =
+                new ArrayList<ItemChooserDialog.ItemChooserRow>();
+
+        for (int i = 0; i < len; ++i) {
+            devices.add(new ItemChooserDialog.ItemChooserRow(deviceIds[i], deviceNames[i]));
+        }
+        mItemChooserDialog.addItemsToList(devices);
+    }
+
+    @CalledByNative
+    private void closeDialog() {
+        mNativeUsbChooserDialogPtr = 0;
+        mItemChooserDialog.dismiss();
+    }
+
+    private native void nativeOnDialogFinished(
+            long nativeUsbChooserAndroid, int eventType, String deviceId);
+    // Help link.
+    private native void nativeShowUsbOverviewLink(long nativeUsbChooserAndroid);
+}