Add spellcheck and word suggestion to the prediction service

services/keyboard_native/text_update_key.cc

Index: services/keyboard_native/text_update_key.cc
diff --git a/services/keyboard_native/text_update_key.cc b/services/keyboard_native/text_update_key.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c29deff01b5efc9eb1e4645f69d4366b810a71b1
--- /dev/null
+++ b/services/keyboard_native/text_update_key.cc
@@ -0,0 +1,80 @@
+// 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 "services/keyboard_native/text_update_key.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkScalar.h"
+#include "ui/gfx/geometry/rect_f.h"
+
+namespace keyboard {
+
+TextUpdateKey::TextUpdateKey(
+    std::string text,
+    base::Callback<void(const TextUpdateKey&)> touch_up_callback)
+    : text_(text), touch_up_callback_(touch_up_callback) {
+}
+
+TextUpdateKey::~TextUpdateKey() {
+}
+
+// Key implementation.
+void TextUpdateKey::Draw(SkCanvas* canvas,
+                         SkPaint& paint,
+                         const gfx::RectF& rect) {
+  std::string text_to_fit = text_;
+  SkRect bounds;
+  paint.measureText((const void*)(text_.c_str()), strlen(text_.c_str()),
+                    &bounds);
+  int text_need_scale = 0;

[APW, 2015/07/31 22:36:42]

boolean?

[riajiang, 2015/08/01 01:23:08]

Done.

+  if (bounds.width() > rect.width() * 0.8) {
+    text_need_scale = 1;
+
+    paint.setTextScaleX(SkFloatToScalar(0.6));

[APW, 2015/07/31 22:36:43]

Can you try using copy constructor to make copy of the paint and set the scale
on that?  If that works make paint const again.

[riajiang, 2015/08/01 01:23:08]

Made a copy of the paint and changed it back to const

+    paint.measureText((const void*)(text_.c_str()), strlen(text_.c_str()),
+                      &bounds);
+    paint.setTextScaleX(SkIntToScalar(1));
+    if (bounds.width() > rect.width() * 0.8) {
+      int dot_size = SkScalarTruncToInt((SkScalarToFloat(bounds.width()) -

[APW, 2015/07/31 22:36:43]

dot_count

[riajiang, 2015/08/01 01:23:08]

Done.

+                                         SkScalarToFloat(rect.width()) * 0.8) /
+                                        SkScalarToFloat(bounds.width()) *
+                                        strlen(text_.c_str())) +
+                     1;
+      if (dot_size >= 3) {

[APW, 2015/07/31 22:36:43]

You can do this better in a loop.

[riajiang, 2015/08/01 01:23:08]

Done.

+        text_to_fit =
+            "..." +
+            text_to_fit.substr(dot_size, text_to_fit.length() - dot_size);
+      } else if (dot_size == 1) {
+        text_to_fit =
+            "." + text_to_fit.substr(dot_size, text_to_fit.length() - dot_size);
+      } else if (dot_size == 2) {
+        text_to_fit =
+            ".." +
+            text_to_fit.substr(dot_size, text_to_fit.length() - dot_size);
+      }
+    }
+  }
+
+  float text_baseline_offset = rect.height() / 5.0f;
+  if (text_need_scale)
+    paint.setTextScaleX(SkFloatToScalar(0.6));

[APW, 2015/07/31 22:36:42]

use braces around this if

[riajiang, 2015/08/01 01:23:08]

Done.

+  canvas->drawText(text_to_fit.c_str(), strlen(text_to_fit.c_str()),
+                   rect.x() + (rect.width() / 2.0f),
+                   rect.y() + rect.height() - text_baseline_offset, paint);
+  paint.setTextScaleX(SkIntToScalar(1));
+}
+
+const char* TextUpdateKey::ToText() const {
+  const char* text_char = text_.c_str();
+  return text_char;
+}
+
+void TextUpdateKey::OnTouchUp() {
+  touch_up_callback_.Run(*this);
+}
+
+void TextUpdateKey::ChangeText(std::string new_text) {
+  text_ = new_text;
+}
+}  // namespace keyboard