mandoline: Add find in page.

components/web_view/find_controller.cc

+// Copyright 2015 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.
+
+#include "components/web_view/find_controller.h"
+
+#include "base/bind.h"
+#include "components/web_view/find_controller_delegate.h"
+#include "components/web_view/frame.h"
+
+namespace web_view {
+
+FindController::FindController(FindControllerDelegate* delegate)
+    : delegate_(delegate),
+      current_find_request_(-1),
+      weak_ptr_factory_(this) {}
+
+FindController::~FindController() {}
+
+void FindController::Find(int32_t request_id, const mojo::String& search_text) {
+  // TODO(erg): While this deals with multiple frames, it does not deal with
+  // going forward or backwards. To do that, we'll have to port all frame
+  // traversal and focusing concepts from blink::WebFrame to mojo::Frame.
+
+  // TODO(erg): This isn't great and causes flashes on character
+  // entry. However, it's needed for now because the internals of TextFinder
+  // still track the entire state of the blink frame tree, and if there are any
+  // frames that have marked text, doing a find clears the results of all
+  // frames _except_ for the first frame that it finds a result on.
+  StopFinding();
+
+  // TODO(erg): This cheap method does not traverse in the order that blink
+  // does.
+  pending_find_frames_ = delegate_->GetAllFrames();
+
+  current_find_request_ = request_id;
+  returned_find_data_.clear();
+
+  // Prime the continue loop.
+  OnContinueFinding(request_id, search_text, false);
+}
+
+void FindController::StopFinding() {
+  // Don't report any callbacks that we get after this.
+  current_find_request_ = -1;
+
+  for (Frame* f : delegate_->GetAllFrames())
+    f->StopFinding(true);
+}
+
+void FindController::OnReportFindInFrameMatchCount(int32_t request_id,
+                                                   Frame* frame,
+                                                   int32_t count,
+                                                   bool final_update) {
+  if (request_id != current_find_request_)
+    return;
+
+  auto it = returned_find_data_.find(frame);
+  if (it == returned_find_data_.end()) {
+    NOTREACHED();
+    return;
+  }
+
+  it->second.count = count;
+  it->second.final_update = final_update;
+
+  int merged_count = 0;
+  bool merged_final_update = true;
+  for (auto const& data : returned_find_data_) {
+    merged_count += data.second.count;
+    merged_final_update = merged_final_update && data.second.final_update;
+  }
+
+  // We can now take the individual FindInFrame messages and construct a
+  // FindInPage message.
+  delegate_->GetWebViewClient()->ReportFindInPageMatchCount(
+      request_id, merged_count, merged_final_update);
+}
+
+void FindController::OnReportFindInPageSelection(int32_t request_id,
+                                                 Frame* frame,
+                                                 int32_t active_match_ordinal) {
+  if (request_id != current_find_request_)
+    return;
+
+  // TODO(erg): This is the one that's really hard. To give an accurate count
+  // here, we need to have all the results for frames that are before the Frame
+  // that contains the selected match so we can add their sums together.
+  //
+  // Thankfully, we don't have to worry about this now. Since there aren't
+  // back/forward controls yet, active_match_ordinal will always be 1.
+  delegate_->GetWebViewClient()->ReportFindInPageSelection(
+      request_id, active_match_ordinal);
+}
+
+void FindController::DidDestroyFrame(Frame* frame) {
+  auto it =
+      find(pending_find_frames_.begin(), pending_find_frames_.end(), frame);
+  if (it != pending_find_frames_.end())
+    pending_find_frames_.erase(it);
+}
+
+void FindController::OnContinueFinding(int32_t request_id,
+                                       const mojo::String& search_text,
+                                       bool found) {
+  if (!found && !pending_find_frames_.empty()) {
+    // No match found, search on the next frame.
+    Frame* next_frame = pending_find_frames_.front();
+    pending_find_frames_.pop_front();
+    next_frame->Find(
+        request_id, search_text,
+        base::Bind(&FindController::OnContinueFinding,
+                   weak_ptr_factory_.GetWeakPtr(),
+                   request_id,
+                   search_text));
+
+    // TODO(erg): This doesn't deal with wrapping around the document at the
+    // end when there are multiple frames.
+    return;
+  }
+
+  pending_find_frames_.clear();
+
+  // We either found a match or we got the final rejection. Either way, we
+  // alert our caller.
+
+  // If nothing is found, set result to "0 of 0", otherwise, set it to
+  // "-1 of 1" to indicate that we found at least one item, but we don't know
+  // yet what is active.
+  int ordinal = found ? -1 : 0;     // -1 here means, we might know more later.
+  int match_count = found ? 1 : 0;  // 1 here means possibly more coming.
+
+  // If we find no matches then this will be our last status update.
+  // Otherwise the scoping effort will send more results.
+  bool final_status_update = !found;
+
+  // Send priming messages.
+  delegate_->GetWebViewClient()->ReportFindInPageSelection(request_id, ordinal);
+  delegate_->GetWebViewClient()->ReportFindInPageMatchCount(
+      request_id, match_count, final_status_update);
+
+  // TODO(erg): This doesn't iterate in the same order as the current code
+  // because we don't have the correct iteration primitives.
+  std::deque<Frame*> frames = delegate_->GetAllFrames();
+  for (Frame* f : frames) {
+    f->CancelPendingScopingEffort();
+
+    if (found) {
+      MatchData& match_data = returned_find_data_[f];
+      match_data.count = 0;
+      match_data.final_update = false;
+      f->ScopeStringMatches(request_id, search_text, true);
+    }
+  }
+}
+
+}  // namespace web_view